main.go

// A work in progress implementation of Conception in Go.
package main

import (
	"bufio"
	"bytes"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"go/ast"
	"go/build"
	"go/importer"
	"go/parser"
	"go/printer"
	"go/token"
	"go/types"
	"io"
	"io/ioutil"
	"log"
	"math"
	"net"
	"net/http"
	_ "net/http/pprof"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"reflect"
	"runtime"
	"strconv"
	"strings"
	textscanner "text/scanner"
	"text/tabwriter"
	"time"

	"github.com/bradfitz/iter"
	"github.com/go-gl/gl/v2.1/gl"
	"github.com/go-gl/glfw/v3.3/glfw"
	"github.com/go-gl/mathgl/mgl64"
	"github.com/mattn/go-runewidth"
	intmath "github.com/pkg/math"
	"github.com/shurcooL-legacy/Conception-go/pkg/analysis"
	"github.com/shurcooL-legacy/Conception-go/pkg/exp11"
	"github.com/shurcooL-legacy/Conception-go/pkg/exp12"
	"github.com/shurcooL-legacy/Conception-go/pkg/exp13"
	"github.com/shurcooL-legacy/Conception-go/pkg/exp14"
	"github.com/shurcooL-legacy/Conception-go/pkg/gist4727543"
	"github.com/shurcooL-legacy/Conception-go/pkg/gist5504644"
	"github.com/shurcooL-legacy/Conception-go/pkg/gist6003701"
	. "github.com/shurcooL-legacy/Conception-go/pkg/gist7480523"
	. "github.com/shurcooL-legacy/Conception-go/pkg/gist7576154"
	. "github.com/shurcooL-legacy/Conception-go/pkg/gist7651991"
	. "github.com/shurcooL-legacy/Conception-go/pkg/gist7802150"
	"github.com/shurcooL-legacy/Conception-go/pkg/httpstoppable"
	"github.com/shurcooL-legacy/Conception-go/pkg/legacyvcs"
	"github.com/shurcooL-legacy/Conception-go/pkg/markdown_http"
	"github.com/shurcooL-legacy/Conception-go/pkg/multilinecontent"
	"github.com/shurcooL-legacy/Conception-go/pkg/u10"
	"github.com/shurcooL-legacy/Conception-go/pkg/u6"
	"github.com/shurcooL-legacy/octicons"
	"github.com/shurcooL/github_flavored_markdown/gfmstyle"
	"github.com/shurcooL/go-goon"
	"github.com/shurcooL/go-goon/bypass"
	"github.com/shurcooL/go/gddo"
	"github.com/shurcooL/go/open"
	"github.com/shurcooL/go/pipeutil"
	"github.com/shurcooL/go/printerutil"
	"github.com/shurcooL/go/reflectfind"
	"github.com/shurcooL/go/reflectsource"
	"github.com/shurcooL/httpfs/union"
	"github.com/shurcooL/httpgzip"
	"github.com/shurcooL/markdownfmt/markdown"
	"github.com/sourcegraph/go-diff/diff"
	"golang.org/x/net/websocket"
	"golang.org/x/tools/godoc/vfs"
	goimports "golang.org/x/tools/imports"
	"gopkg.in/pipe.v2"

	"github.com/shurcooL-legacy/Conception-go/caret"
	"github.com/shurcooL-legacy/Conception-go/event"
)

var modeFlag = flag.Int("mode", 1, "Mode.")
var headlessFlag = flag.Bool("headless", false, "Headless mode.")

var keepRunning = true
var redraw = true
var windowPointer = &Pointer{VirtualCategory: event.Windowing}
var mousePointer = &Pointer{VirtualCategory: event.Pointing}
var keyboardPointer = &Pointer{VirtualCategory: event.Typing}
var websocketPointer *Pointer // TEST

var buildOutput caret.MultilineContentI
var goCompileErrorsTest GoCompileErrorsTest
var goCompileErrorsManagerTest GoCompileErrorsManagerTest

var booVcs *exp12.Directory

var windowFocusedEvent DepNode2ManualI = &DepNode2Manual{} // TEST.

// Colors
var (
	nearlyWhiteColor = mgl64.Vec3{0.975, 0.975, 0.975}
	veryLightColor   = mgl64.Vec3{0.95, 0.95, 0.95}
	lightColor       = mgl64.Vec3{0.85, 0.85, 0.85}
	grayColor        = mgl64.Vec3{0.75, 0.75, 0.75}
	darkColor        = mgl64.Vec3{0.35, 0.35, 0.35}
	veryDarkColor    = mgl64.Vec3{0.1, 0.1, 0.1}
	nearlyBlackColor = mgl64.Vec3{0.025, 0.025, 0.025}

	highlightColor = mgl64.Vec3{0.898, 0.765, 0.396} // Yellowish on-hover border color.

	selectedTextColor         = mgl64.Vec3{195 / 255.0, 212 / 255.0, 242 / 255.0}
	selectedTextDarkColor     = selectedTextColor.Mul(0.75)
	selectedTextInactiveColor = mgl64.Vec3{225 / 255.0, 235 / 255.0, 250 / 255.0}

	selectedEntryColor         = mgl64.Vec3{0.21, 0.45, 0.84}
	selectedEntryInactiveColor = lightColor

	lightRedColor    = mgl64.Vec3{1, 0.867, 0.867}
	lightGreenColor  = mgl64.Vec3{0.867, 1, 0.867}
	mediumRedColor   = mgl64.Vec3{1, 0.767, 0.767}
	mediumGreenColor = mgl64.Vec3{0.767, 1, 0.767}
	darkRedColor     = mgl64.Vec3{1, 0.667, 0.667}
	darkGreenColor   = mgl64.Vec3{0.667, 1, 0.667}
)

var np = mgl64.Vec2{} // np stands for "No Position" and it's basically the (0, 0) position, used when it doesn't matter

// TODO: Remove these
var globalWindow *glfw.Window
var keepUpdatedTEST = []DepNode2I{}
var globalParsedFile *parsedFile
var globalGoSymbols SliceStringer
var con2RunBinPath = filepath.Join(os.TempDir(), "Conception-go", "Con2RunBin")

// ---

type ChangeListener interface {
	NotifyChange()
}

type ChangeListenerFunc func()

func (f ChangeListenerFunc) NotifyChange() {
	f()
}

// ---

type DepNodeI interface {
	AddChangeListener(l ChangeListener)
}

type DepNode struct {
	changeListeners []ChangeListener
}

func (this *DepNode) AddChangeListener(l ChangeListener) {
	this.changeListeners = append(this.changeListeners, l)

	l.NotifyChange() // TODO: In future, don't literally NotifyChange() right away, as this can lead to duplicate work; instead mark as "need to update" for next run
}

// Pre-condition: l is a change listener that exists
func (this *DepNode) RemoveChangeListener(l ChangeListener) {
	for i := range this.changeListeners {
		if this.changeListeners[i] == l {
			// Delete
			copy(this.changeListeners[i:], this.changeListeners[i+1:])
			this.changeListeners[len(this.changeListeners)-1] = nil
			this.changeListeners = this.changeListeners[:len(this.changeListeners)-1]
			//println("removed ith element of originally this many", i, len(this.changeListeners)+1)
			return
		}
	}
	panic("RemoveChangeListener: ChangeListener to be deleted wasn't found.")
}

func (this *DepNode) NotifyAllListeners() {
	// TODO: In future, don't literally NotifyChange() right away, as this can lead to duplicate work; instead mark as "need to update" for next run
	for _, changeListener := range this.changeListeners {
		changeListener.NotifyChange()
	}
}

// ---

type Widgeter interface {
	PollLogic()
	io.Closer
	Layout()
	LayoutNeeded()
	Render()
	Hit(mgl64.Vec2) []Widgeter
	ProcessEvent(InputEvent)                     // TODO: Upgrade to MatchEventQueue() or so
	ContainsWidget(widget, target Widgeter) bool // Returns true if target is widget or within it.

	Pos() *mgl64.Vec2
	Size() *mgl64.Vec2
	HoverPointers() map[*Pointer]bool
	Parent() Widgeter
	SetParent(Widgeter)

	ParentToLocal(mgl64.Vec2) mgl64.Vec2

	DepNodeI
}

type Widgeters []Widgeter

type Widget struct {
	pos           mgl64.Vec2
	size          mgl64.Vec2
	hoverPointers map[*Pointer]bool
	parent        Widgeter

	DepNode
}

func NewWidget(pos, size mgl64.Vec2) Widget {
	return Widget{pos: pos, size: size, hoverPointers: map[*Pointer]bool{}}
}

func (_ *Widget) PollLogic()   {}
func (_ *Widget) Close() error { return nil }
func (w *Widget) Layout() {
	if w.parent != nil {
		w.parent.Layout()
	}
}
func (_ *Widget) LayoutNeeded() {}
func (_ *Widget) Render()       {}
func (w *Widget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	Hit := (LocalPosition[0] >= 0 &&
		LocalPosition[1] >= 0 &&
		LocalPosition[0] <= w.size[0] &&
		LocalPosition[1] <= w.size[1])

	if Hit {
		return []Widgeter{w}
	} else {
		return nil
	}
}
func (w *Widget) ProcessEvent(inputEvent InputEvent) {}
func (_ *Widget) ContainsWidget(widget, target Widgeter) bool {
	return widget == target
}

func (w *Widget) Pos() *mgl64.Vec2  { return &w.pos }
func (w *Widget) Size() *mgl64.Vec2 { return &w.size }

func (w *Widget) HoverPointers() map[*Pointer]bool {
	return w.hoverPointers
}

func (w *Widget) Parent() Widgeter     { return w.parent }
func (w *Widget) SetParent(p Widgeter) { w.parent = p }

func (w *Widget) ParentToLocal(ParentPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return ParentPosition.Sub(w.pos)
}

type WidgeterS struct{ Widgeter }

func (w WidgeterS) GlobalToParent(GlobalPosition mgl64.Vec2) (ParentPosition mgl64.Vec2) {
	switch w.Parent() {
	case nil:
		ParentPosition = GlobalPosition
	default:
		ParentPosition = WidgeterS{w.Parent()}.GlobalToLocal(GlobalPosition)
	}
	return ParentPosition
}
func (w WidgeterS) GlobalToLocal(GlobalPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return w.ParentToLocal(WidgeterS{w}.GlobalToParent(GlobalPosition))
}

// ---

type CustomWidget struct {
	Widget
	PollLogicFunc    func(this *CustomWidget)
	RenderFunc       func()
	ProcessEventFunc func(inputEvent InputEvent)
	CloseFunc        func() error
}

func (this *CustomWidget) PollLogic() {
	if this.PollLogicFunc != nil {
		this.PollLogicFunc(this)
	} else {
		this.Widget.PollLogic()
	}
}

func (this *CustomWidget) Render() {
	if this.RenderFunc != nil {
		this.RenderFunc()
	} else {
		this.Widget.Render()
	}
}

func (this *CustomWidget) ProcessEvent(inputEvent InputEvent) {
	if this.ProcessEventFunc != nil {
		this.ProcessEventFunc(inputEvent)
	} else {
		this.Widget.ProcessEvent(inputEvent)
	}
}

func (this *CustomWidget) Close() error {
	if this.CloseFunc == nil {
		return nil
	}
	return this.CloseFunc()
}

// ---

type Test1Widget struct {
	Widget
}

func NewTest1Widget(pos mgl64.Vec2) *Test1Widget {
	return &Test1Widget{Widget: NewWidget(pos, mgl64.Vec2{300, 300})}
}

func (w *Test1Widget) Render() {
	DrawNBox(w.pos, w.size)
	gl.Color3d(0, 0, 0)
	//PrintText(w.pos, goon.Sdump(inputEventQueue))

	//x := gist5504644.GetDocPackageAll("gist.github.com/5694308.git")
	//PrintText(w.pos, strings.Join(x.Imports, "\n"))

	/*files, _ := ioutil.ReadDir("/Users/Dmitri/Dropbox/Work/2013/GoLand/src/")
	for lineIndex, file := range files {
		if file.IsDir() {
			PrintText(w.pos.Add(mathgl.Vec2d{0, float64(16 * lineIndex)}), ">>>> " + file.Name() + "/ (FOLDER)")
		} else {
			PrintText(w.pos.Add(mathgl.Vec2d{0, float64(16 * lineIndex)}), file.Name())
		}
	}*/

	//PrintText(w.pos, readFileOrEmpty("/Users/Dmitri/Dropbox/Work/2013/GoLand/src/PrintPackageSummary.go"))

	//pkg := GetThisGoPackage()
	//PrintText(w.pos, pkg.ImportPath+" - "+pkg.Name)

	//PrintText(w.pos, string(debug.Stack()))

	//PrintText(w.pos, GetThisGoSourceFilepath())
	//PrintText(w.pos.Add(mathgl.Vec2d{0, 16}), GetThisGoSourceDir())
	//PrintText(w.pos.Add(mathgl.Vec2d{0, 2 * 16}), GetThisGoPackage().ImportPath)

	/*x := gist5504644.GetDocPackageAll(gist5504644.BuildPackageFromSrcDir(GetThisGoSourceDir()))
	for lineIndex, y := range x.Vars {
		PrintText(w.pos.Add(mathgl.Vec2d{0, float64(16 * lineIndex)}), printerutil.SprintAstBare(y.Decl))
	}*/

	/*kat := widgets[len(widgets)-2].(*KatWidget)
	PrintText(w.pos, fmt.Sprintf("%d %s", kat.mode, kat.mode.String()))*/
}

// ---

type Test2Widget struct {
	*TextBoxWidget
	field *float64
}

func NewTest2Widget(pos mgl64.Vec2, field *float64) *Test2Widget {
	return &Test2Widget{TextBoxWidget: NewTextBoxWidgetExternalContent(pos, NewMultilineContentFuncInstant(func() string { return strings.TrimSuffix(goon.Sdump(*field), "\n") }), nil), field: field}
}

func (w *Test2Widget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

func (w *Test2Widget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.Pointer.State.Button(0) && (inputEvent.EventTypes[event.SliderEvent] && inputEvent.InputId == 0) {
		*w.field += inputEvent.Sliders[0]
	}
}

// ---

type parsedFile struct {
	fset    *token.FileSet
	fileAst *ast.File
	err     error

	DepNode2
}

func (t *parsedFile) Update() {
	started := time.Now()
	defer func() { fmt.Println("parsedFile.Update:", time.Since(started).Seconds()*1000, "ms") }()

	source := t.GetSources()[0].(caret.MultilineContentI)
	fset := token.NewFileSet()
	fileAst, err := parser.ParseFile(fset, "", source.Content(), parser.ParseComments|parser.AllErrors)

	{
		//fileAst.Decls[0].(*ast.GenDecl).Specs = append(fileAst.Decls[0].(*ast.GenDecl).Specs, &ast.ImportSpec{Path: &ast.BasicLit{Kind: token.STRING, Value: `"yay/new/import"`}})
		//astutil.AddImport(fset, fileAst, "yay/new/import")
	}

	t.fset = fset
	t.fileAst = fileAst
	t.err = err
}

func NewTest3Widget(pos mgl64.Vec2, source *TextBoxWidget) (*LiveGoroutineExpeWidget, *parsedFile) {
	parsedFile := &parsedFile{}
	parsedFile.AddSources(source.Content)

	params := func() interface{} {
		return []interface{}{
			source.caretPosition.Logical(),
			parsedFile.fset,
			parsedFile.fileAst,
		}
	}

	action := func(params interface{}) string {
		index := params.([]interface{})[0].(uint32)
		fset := params.([]interface{})[1].(*token.FileSet)
		fileAst := params.([]interface{})[2].(*ast.File)

		query := func(i interface{}) bool {
			if f, ok := i.(ast.Node); ok && (uint32(f.Pos())-1 <= index && index <= uint32(f.End())-1) {
				return true
			}
			return false
		}
		found := reflectfind.All(fileAst, query)

		if len(found) == 0 {
			return ""
		}
		smallest := uint64(math.MaxUint64)
		var smallestV interface{}
		for v := range found {
			size := uint64(v.(ast.Node).End() - v.(ast.Node).Pos())
			if size < smallest {
				smallestV = v
				smallest = size
			}
		}
		out := fmt.Sprintf("%d-%d, ", smallestV.(ast.Node).Pos()-1, smallestV.(ast.Node).End()-1)
		out += fmt.Sprintf("%p, %T\n", smallestV, smallestV)
		out += printerutil.SprintAst(fset, smallestV) + "\n\n"

		// This is can be huge if ran on root AST node of large Go files, so don't
		if _, huge := smallestV.(*ast.File); !huge {
			buf := new(bytes.Buffer)
			_ = ast.Fprint(buf, fset, smallestV, nil)
			out += buf.String()

			out += goon.Sdump(smallestV)
		}
		return out
	}

	w := NewLiveGoroutineExpeWidget(pos, true, []DepNode2I{parsedFile, source.caretPosition}, params, action)
	return w, parsedFile
}

// ---

type typeCheckedPackage struct {
	fset  *token.FileSet
	files []*ast.File

	tpkg *types.Package
	info *types.Info

	DepNode2
}

func (t *typeCheckedPackage) Update() {
	started := time.Now()
	defer func() { fmt.Println("typeCheckedPackage.Update:", time.Since(started).Seconds()*1000, "ms") }()

	goPackageSelecter := t.GetSources()[0].(GoPackageSelecter)

	if goPackageSelecter.GetSelectedGoPackage() == nil {
		t.fset = nil
		t.files = nil
		t.tpkg = nil
		t.info = nil
		return
	}

	bpkg := goPackageSelecter.GetSelectedGoPackage().Bpkg

	fset := token.NewFileSet()
	files, err := gist5504644.ParseFiles(fset, bpkg.Dir, append(bpkg.GoFiles, bpkg.CgoFiles...)...)
	if err != nil {
		t.fset = nil
		t.files = nil
		t.tpkg = nil
		t.info = nil
		return
	}

	t.fset = fset
	t.files = files

	cfg := &types.Config{Importer: importer.Default()}
	info := &types.Info{
		Types:      make(map[ast.Expr]types.TypeAndValue),
		Defs:       make(map[*ast.Ident]types.Object),
		Uses:       make(map[*ast.Ident]types.Object),
		Implicits:  make(map[ast.Node]types.Object),
		Selections: make(map[*ast.SelectorExpr]*types.Selection),
		Scopes:     make(map[ast.Node]*types.Scope),
	}
	tpkg, err := cfg.Check(bpkg.ImportPath, fset, files, info)
	if err == nil {
		t.tpkg = tpkg
		t.info = info
	} else {
		if strings.Contains(err.Error(), "could not import C") {
			// To add support, can use the same strategy as honnef.co/go/importer did
			// and fallback to a gcimporter.
			log.Println("type checking Cgo packages currently unsupported")
		}
		t.tpkg = nil
		t.info = nil
	}
}

// HACK
var Test4WidgetIdent *ast.Ident

func FindFileAst(fset *token.FileSet, file *token.File, fileAsts []*ast.File) *ast.File {
	for _, fileAst := range fileAsts {
		if fset.File(fileAst.Package) == file {
			return fileAst
		}
	}
	return nil
}

func NewTest4Widget(pos mgl64.Vec2, goPackageSelecter GoPackageSelecter, source *TextBoxWidget) (*LiveGoroutineExpeWidget, *typeCheckedPackage) {
	typeCheckedPackage := &typeCheckedPackage{}
	typeCheckedPackage.AddSources(goPackageSelecter, source.Content)

	params := func() interface{} {
		fileUri, _ := source.Content.GetUriForProtocol("file://")
		return []interface{}{
			source.caretPosition.Logical(),
			fileUri,
			typeCheckedPackage.fset,
			typeCheckedPackage.files,
			typeCheckedPackage.info,
		}
	}

	action := func(params interface{}) string {
		index := params.([]interface{})[0].(uint32)
		fileUri := params.([]interface{})[1].(FileUri)
		fset := params.([]interface{})[2].(*token.FileSet)
		files := params.([]interface{})[3].([]*ast.File)
		//tpkg := typeCheckedPackage.tpkg
		info := params.([]interface{})[4].(*types.Info)

		if fset == nil {
			return "fset == nil"
		}

		// Figure out the file index and token.Pos of caret in that file
		var fileAst *ast.File
		var caretPos token.Pos
		fset.Iterate(func(file *token.File) bool {
			if fileUri == FileUri("file://"+file.Name()) {
				fileAst = FindFileAst(fset, file, files)
				caretPos = file.Pos(int(index))
				return false
			}
			return true
		})

		if fileAst == nil {
			return "fileAst == null, caretPos == token.NoPos"
		}

		var found2 []ast.Node
		ast.Inspect(fileAst, func(n ast.Node) bool {
			if n != nil && n.Pos() <= caretPos && caretPos <= n.End() {
				found2 = append(found2, n)
				return true
			}
			return false
		})
		if len(found2) == 0 {
			return ""
		}

		out := ""
		smallestV := found2[len(found2)-1]
		for _, v := range found2 {
			size := v.End() - v.Pos()
			out += fmt.Sprintf("%T %d-%d [%d]\n", v, v.Pos()-1, v.End()-1, size)
		}
		out += "\n"

		out += fmt.Sprintf("%d-%d, %p, %T\n\n", smallestV.Pos()-1, smallestV.End()-1, (interface{})(smallestV), smallestV)

		out += printerutil.SprintAst(fset, smallestV) + "\n\n"

		if ident, ok := smallestV.(*ast.Ident); ok {
			Test4WidgetIdent = ident // HACK

			if obj := findTypesObject(info, ident); obj != nil {
				out += ">>> " + typeChainString(obj.Type())
				if constObj, ok := obj.(*types.Const); ok {
					out += fmt.Sprintf(" = %v", constObj.Val())
				}
				out += "\n\n"
			} else {
				out += "nil obj\n\n"
			}
		}

		// This is can be huge if ran on root AST node of large Go files, so don't
		if _, huge := smallestV.(*ast.File); !huge {
			buf := new(bytes.Buffer)
			_ = ast.Fprint(buf, fset, smallestV, nil)
			out += buf.String()

			out += goon.Sdump(smallestV)

			out += goon.SdumpExpr(fset)
		}
		return out
	}

	w := NewLiveGoroutineExpeWidget(pos, true, []DepNode2I{typeCheckedPackage, source.caretPosition}, params, action)
	return w, typeCheckedPackage
}

func NewTypeUnderCaretWidget(pos mgl64.Vec2, goPackageSelecter GoPackageSelecter, source *TextBoxWidget, typeCheckedPackage *typeCheckedPackage) *LiveGoroutineExpeWidget {
	params := func() interface{} {
		fileUri, _ := source.Content.GetUriForProtocol("file://")
		return []interface{}{
			source.caretPosition.Logical(),
			fileUri,
			typeCheckedPackage.fset,
			typeCheckedPackage.files,
			typeCheckedPackage.info,
		}
	}

	action := func(params interface{}) string {
		index := params.([]interface{})[0].(uint32)
		fileUri := params.([]interface{})[1].(FileUri)
		fset := params.([]interface{})[2].(*token.FileSet)
		files := params.([]interface{})[3].([]*ast.File)
		//tpkg := typeCheckedPackage.tpkg
		info := params.([]interface{})[4].(*types.Info)

		if fset == nil {
			return "fset == nil"
		}

		// Figure out the file index and token.Pos of caret in that file
		var fileAst *ast.File
		var caretPos token.Pos
		fset.Iterate(func(file *token.File) bool {
			if fileUri == FileUri("file://"+file.Name()) {
				fileAst = FindFileAst(fset, file, files)
				caretPos = file.Pos(int(index))
				return false
			}
			return true
		})

		if fileAst == nil {
			return "fileAst == null, caretPos == token.NoPos"
		}

		var found2 []ast.Node
		ast.Inspect(fileAst, func(n ast.Node) bool {
			if n != nil && n.Pos() <= caretPos && caretPos <= n.End() {
				found2 = append(found2, n)
				return true
			}
			return false
		})

		if len(found2) == 0 {
			return ""
		}

		out := ""

		smallestV := found2[len(found2)-1]

		if ident, ok := smallestV.(*ast.Ident); ok {
			Test4WidgetIdent = ident // HACK

			if obj := findTypesObject(info, ident); obj != nil {
				out += typeChainString(obj.Type())
				if constObj, ok := obj.(*types.Const); ok {
					out += fmt.Sprintf(" = %v", constObj.Val())
				}
			} else {
				out += "nil Object"
			}
		}

		return out
	}

	w := NewLiveGoroutineExpeWidget(pos, true, []DepNode2I{typeCheckedPackage, source.caretPosition}, params, action)
	return w
}

func findTypesObject(info *types.Info, ident *ast.Ident) (obj types.Object) {
	if info != nil {
		switch {
		case info.Uses[ident] != nil:
			obj = info.Uses[ident]
		case info.Defs[ident] != nil:
			obj = info.Defs[ident]
		}
	}
	return obj
}

// typeChainString returns the full type chain as a string.
func typeChainString(t types.Type) string {
	out := fmt.Sprintf("%s", t)
	for {
		if t == t.Underlying() {
			break
		} else {
			t = t.Underlying()
		}
		out += fmt.Sprintf(" -> %s", t)
	}
	return out
}

// ---

type SliceStringerS struct {
	entries []fmt.Stringer
	DepNode2Manual
}

func NewSliceStringerS(entries ...string) *SliceStringerS {
	s := &SliceStringerS{}
	for _, entry := range entries {
		s.entries = append(s.entries, json.Number(entry))
	}
	return s
}

func NewSliceStringerAllGoPackages(path string) *SliceStringerS {
	f, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	var importers gddo.Importers
	if err := json.NewDecoder(f).Decode(&importers); err != nil {
		panic(err)
	}

	s := &SliceStringerS{}
	for _, entry := range importers.Results {
		s.entries = append(s.entries, json.Number(entry.Path))
	}
	return s
}

func (this *SliceStringerS) Get(index uint64) fmt.Stringer {
	return this.entries[index]
}

func (this *SliceStringerS) Len() uint64 {
	return uint64(len(this.entries))
}

var oracleModes = NewSliceStringerS("callees", "callers", "callgraph", "callstack", "describe", "freevars", "implements", "peers", "referrers")

func NewTest6OracleWidget(pos mgl64.Vec2, goPackageSelecter GoPackageSelecter, source *TextBoxWidget) Widgeter {
	mode := NewSelecterWidget(np, oracleModes, nil)

	params := func() interface{} {
		fileUri, _ := source.Content.GetUriForProtocol("file://")
		return []interface{}{
			source.caretPosition.Logical(),
			fileUri,
			goPackageSelecter,
			mode.GetSelected().String(),
		}
	}

	action := func(params interface{}) string {
		caretPosition := params.([]interface{})[0].(uint32)
		fileUri := params.([]interface{})[1].(FileUri)
		goPackageSelecter := params.([]interface{})[2].(GoPackageSelecter)
		mode := params.([]interface{})[3].(string)

		if pkg := goPackageSelecter.GetSelectedGoPackage(); pkg != nil && fileUri != "" && mode != "" {
			cmd := exec.Command("oracle", fmt.Sprintf("--pos=%s:#%d", fileUri[len("file://"):], caretPosition), mode, pkg.Bpkg.ImportPath)
			out, err := cmd.CombinedOutput()
			if err != nil {
				return strings.Join(cmd.Args, " ") + "\nError:\n" + err.Error() + "\nOutput:\n" + string(out)
			}
			return strings.Join(cmd.Args, " ") + "\n" + string(out)
		} else {
			return "<no file or mode selected>"
		}
	}

	w := NewLiveGoroutineExpeWidget(pos, false, []DepNode2I{source.caretPosition, goPackageSelecter, mode}, params, action)

	return NewFlowLayoutWidget(pos, Widgeters{mode, w}, nil)
}

// ---

// NOTE: I'm probably not going to use doc.Package because it duplicates AST stuff from other packages, and doesn't point back to real code...
// Instead, I mimic doc.Package functionality, but stack it on top of types.Package rather than a duplicated ast.Package.
/*type docPackage struct {
	dpkg *doc.Package

	DepNode2
}

func (this *docPackage) Update() {
	goPackage := this.GetSources()[0].(ImportPathFoundSelecter)

	importPath := ""
	if goPackage.GetSelected() != nil {
		importPath = goPackage.GetSelected().ImportPath()
	}

	// TODO: Factor out bpkg into buildPackage DepNode2
	bpkg, err := gist5504644.BuildPackageFromImportPath(importPath)
	if err != nil {
		this.dpkg = nil
		return
	}

	dpkg, err := gist5504644.GetDocPackageAll(bpkg, nil)
	if err != nil {
		this.dpkg = nil
		return
	}

	this.dpkg = dpkg
}*/

// ---

type NodeStringer interface {
	ast.Node
	fmt.Stringer
}

type nodeStringer struct {
	ast.Node
	str string
}

func NewNodeStringer(node ast.Node) NodeStringer {
	return nodeStringer{Node: node, str: printerutil.SprintAstBare(node)}
}

func (this nodeStringer) String() string { return this.str }

type twoNodeStringer struct {
	pos, end token.Pos
	str      string
}

func NewTwoNodeStringer(node0, node1 ast.Node, str string) NodeStringer {
	return twoNodeStringer{pos: node0.Pos(), end: node1.End(), str: str}
}

func (this twoNodeStringer) Pos() token.Pos { return this.pos }
func (this twoNodeStringer) End() token.Pos { return this.end }
func (this twoNodeStringer) String() string { return this.str }

// ---

type goSymbols struct {
	entries []NodeStringer

	DepNode2
}

func (this *goSymbols) Get(index uint64) fmt.Stringer {
	return this.entries[index]
}

func (this *goSymbols) Len() uint64 {
	return uint64(len(this.entries))
}

/*func (this *goSymbols) Update() {
	dpkg := this.GetSources()[0].(*docPackage).dpkg

	if dpkg == nil {
		this.entries = nil
		return
	}

	this.entries = nil
	for _, f := range dpkg.Funcs {
		this.entries = append(this.entries, NewNodeStringer(f.Decl))
	}
	for _, t := range dpkg.Types {
		for _, f := range t.Funcs {
			this.entries = append(this.entries, NewNodeStringer(f.Decl))
		}
		for _, m := range t.Methods {
			this.entries = append(this.entries, NewNodeStringer(m.Decl))
		}
	}
}

func NewTest5Widget(pos mathgl.Vec2d, goPackage *GoPackageListingPureWidget, source *TextBoxWidget) *ListWidget {
	docPackage := &docPackage{}
	docPackage.AddSources(goPackage, source.Content)

	goSymbols := &goSymbols{}
	goSymbols.AddSources(docPackage)

	w := NewListWidget(np, goSymbols)
	return w
}*/

type goSymbolsB struct {
	goSymbols
}

func (this *goSymbolsB) Update() {
	files := this.GetSources()[0].(*typeCheckedPackage).files

	if files == nil {
		this.entries = nil
		return
	}

	// Mimic doc.Package functionality, but stack it on top of types.Package rather than a duplicated ast.Package
	// https://code.google.com/p/go/source/browse/src/pkg/go/doc/reader.go?name=release#456
	this.entries = nil
	for _, fileAst := range files {
		for _, decl := range fileAst.Decls {
			switch d := decl.(type) {
			case *ast.FuncDecl:
				funcDeclSignature := &ast.FuncDecl{Recv: d.Recv, Name: d.Name, Type: d.Type}
				nodeStringer := nodeStringer{Node: d, str: printerutil.SprintAstBare(funcDeclSignature)}
				this.entries = append(this.entries, nodeStringer)
			}
		}
	}
}

type goSymbolsC struct {
	goSymbols
}

func (this *goSymbolsC) Update() {
	fileAst := this.GetSources()[0].(*parsedFile).fileAst

	if fileAst == nil {
		this.entries = nil
		return
	}

	// Mimic doc.Package functionality, but stack it on top of ast.File rather than a duplicated ast.Package
	// https://code.google.com/p/go/source/browse/src/pkg/go/doc/reader.go?name=release#456
	this.entries = nil
	for _, decl := range fileAst.Decls {
		switch d := decl.(type) {
		case *ast.FuncDecl:
			if d.Recv != nil {
				name := "(" + printerutil.SprintAstBare(d.Recv.List[0].Type) + ") " + d.Name.String()
				this.entries = append(this.entries, NewTwoNodeStringer(d.Recv, d.Name, name))
			} else {
				this.entries = append(this.entries, NewNodeStringer(d.Name))
			}
		case *ast.GenDecl:
			switch d.Tok {
			case token.TYPE:
				for _, spec := range d.Specs {
					ident := spec.(*ast.TypeSpec).Name
					this.entries = append(this.entries, NewNodeStringer(ident))
				}
			case token.CONST, token.VAR:
				for _, spec := range d.Specs {
					for _, ident := range spec.(*ast.ValueSpec).Names {
						this.entries = append(this.entries, NewNodeStringer(ident))
					}
				}
			}
		}
	}
}

// =====

type goPackagesSliceStringer struct {
	*exp14.GoPackages
}

func (this *goPackagesSliceStringer) Get(index uint64) fmt.Stringer {
	return this.Entries[index]
}

func (this *goPackagesSliceStringer) Len() uint64 {
	return uint64(len(this.Entries))
}

// ---

type GoPackageSelecter interface {
	GetSelectedGoPackage() *GoPackage

	DepNode2I
}

type GoPackageSelecterAdapter struct {
	Selecter
}

func (this *GoPackageSelecterAdapter) GetSelectedGoPackage() *GoPackage {
	if selected := this.GetSelected(); selected != nil {
		return selected.(*GoPackage)
	} else {
		return nil
	}
}

// TODO: Move to the right place.
//var goPackages = &exp14.GoPackages{SkipGoroot: true}
var goPackages = &exp14.GoPackages{SkipGoroot: false}

func NewGoPackageListingWidget(pos, size mgl64.Vec2) *SearchableListWidget {
	//goPackagesSliceStringer := &goPackagesSliceStringer{&exp14.GoPackages{SkipGoroot: false}}
	goPackagesSliceStringer := &goPackagesSliceStringer{goPackages}

	w := NewSearchableListWidget(pos, size, goPackagesSliceStringer)
	return w
}

// =====

type GoCompileErrorsManagerTest struct {
	//Sources []*GoCompileErrorsTest // TODO: Migrate to using DepNode2
	DepNode2

	All map[FileUri]map[int][]string // FileUri -> LineIndex -> []Message.
}

func (this *GoCompileErrorsManagerTest) Update() {
	this.All = make(map[FileUri]map[int][]string)

	for _, source := range this.GetSources() {
		for _, goCompilerError := range source.(*GoCompileErrorsTest).Out {
			if _, ok := this.All[goCompilerError.FileUri]; !ok {
				this.All[goCompilerError.FileUri] = make(map[int][]string)
			}
			this.All[goCompilerError.FileUri][goCompilerError.ErrorMessage.LineIndex] = append(this.All[goCompilerError.FileUri][goCompilerError.ErrorMessage.LineIndex], goCompilerError.ErrorMessage.Message)
		}
	}

	redraw = true // TODO: Think about this and deprecate if possible
}

// ---

type GoCompileErrorsTest struct {
	DepNode2
	Dir string // Assume build output is relative to this dir. If empty, assume cwd.

	Out []GoCompilerError
}

type GoErrorMessage struct {
	LineIndex int
	Message   string
}

type GoCompilerError struct {
	FileUri      FileUri
	ErrorMessage GoErrorMessage
}

func (this *GoCompileErrorsTest) Update() {
	reduceFunc := func(in string) interface{} {
		x := strings.Index(in, ":") // Find first colon
		if x == -1 {
			return nil
		}
		fileUri, err := filepath.Abs(filepath.Join(this.Dir, in[:x]))
		if err != nil {
			return nil
		}
		// TODO: Check if file exists? Maybe?

		in = in[x+1:]
		x = strings.Index(in, ":") // Find second colon
		if x == -1 {
			return nil
		}
		lineNumber, err := strconv.Atoi(in[:x])
		if err != nil {
			return nil
		}
		lineIndex := lineNumber - 1 // Convert line number (e.g. 1) to line index (e.g. 0)

		in = in[x+1:]
		message := strings.TrimPrefix(in, " ")

		return GoCompilerError{FileUri: FileUri("file://" + fileUri), ErrorMessage: GoErrorMessage{LineIndex: lineIndex, Message: message}}
	}

	source := this.DepNode2.GetSources()[0].(caret.MultilineContentI)
	outChan := GoReduceLinesFromReader(NewContentReader(source), 4, reduceFunc) // TODO: Preserve order (for error messages on same line) by using an order preserving version of GoReduce...
	//outChan := GoReduceLinesFromReader(NewContentReader(this.DepNode2.Sources[0].(caret.MultilineContentI)), 4, reduceFunc)

	this.Out = nil
	for out := range outChan {
		this.Out = append(this.Out, out.(GoCompilerError))
	}
}

// ---

type ButtonTriggerWidget struct {
	*ButtonWidget
	DepNode2Manual
}

func NewButtonTriggerWidget(pos mgl64.Vec2) *ButtonTriggerWidget {
	w := &ButtonTriggerWidget{}
	w.ButtonWidget = NewButtonWidget(pos, func() { ExternallyUpdated(&w.DepNode2Manual) })

	return w
}

// ---

type ButtonLabelWidget struct {
	*ButtonWidget
	label string
}

func NewButtonLabelWidget(pos mgl64.Vec2, label string, action func()) *ButtonLabelWidget {
	w := &ButtonLabelWidget{ButtonWidget: NewButtonWidget(pos, action), label: label}

	w.ButtonWidget.Widget.Size()[0] = float64(fontWidth*len(label) + 8)
	w.ButtonWidget.Widget.Size()[1] = fontHeight

	return w
}

func (w *ButtonLabelWidget) Render() {
	w.ButtonWidget.Render()

	gl.Color3d(0, 0, 0)
	NewOpenGLStream(w.Pos().Add(mgl64.Vec2{4, 0})).PrintLine(w.label)
}

// ---

type ButtonWidget struct {
	Widget
	action  func()
	tooltip Widgeter
}

func NewButtonWidget(pos mgl64.Vec2, action func()) *ButtonWidget {
	w := &ButtonWidget{Widget: NewWidget(pos, mgl64.Vec2{fontHeight, fontHeight})}
	w.setAction(action)

	return w
}

func (w *ButtonWidget) setAction(action func()) {
	w.action = action

	if action != nil {
		// HACK: This isn't thread-safe in any way
		//go func() { w.tooltip = NewTextLabelWidgetString(np, reflectsource.GetSourceAsString(action)) }()
	}
}

func (w *ButtonWidget) Render() {
	// HACK: Brute-force check the mouse pointer if it contains this widget
	isOriginHit := false
	for _, hit := range mousePointer.OriginMapping {
		if w == hit {
			isOriginHit = true
			break
		}
	}
	isHit := len(w.HoverPointers()) > 0

	// HACK: Assumes mousePointer rather than considering all connected pointing pointers
	if isOriginHit && mousePointer.State.IsActive() && isHit {
		//DrawGBox(w.pos, w.size)
		DrawInnerRoundedBox(w.pos, w.size, highlightColor, grayColor)
	} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
		//DrawYBox(w.pos, w.size)
		DrawInnerRoundedBox(w.pos, w.size, highlightColor, nearlyWhiteColor)
	} else {
		//DrawNBox(w.pos, w.size)
		DrawInnerRoundedBox(w.pos, w.size, mgl64.Vec3{0.3, 0.3, 0.3}, nearlyWhiteColor)
	}

	// Tooltip
	if w.tooltip != nil && isHit {
		mousePointerPositionLocal := WidgeterS{w}.GlobalToLocal(mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]})
		tooltipOffset := mgl64.Vec2{0, 16}
		*w.tooltip.Pos() = w.pos.Add(mousePointerPositionLocal).Add(tooltipOffset)
		w.tooltip.Render()
	}
}
func (w *ButtonWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

func (w *ButtonWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == false &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		if w.action != nil {
			w.action()
			//println(reflectsource.GetSourceAsString(w.action))

			w.Layout()
			//w.NotifyAllListeners()
		}
	}
}

// ---

type TriButtonWidget struct {
	*ButtonWidget
	state bool
}

func NewTriButtonWidget(pos mgl64.Vec2, action func()) *TriButtonWidget {
	w := &TriButtonWidget{ButtonWidget: NewButtonWidget(pos, nil)}
	w.setAction(action)

	return w
}

// Pre-conditions: Currently, nil action is not supported.
func (w *TriButtonWidget) setAction(action func()) {
	w.action = func() {
		w.state = !w.state
		action()
	}
}

func (w *TriButtonWidget) Render() {
	gl.Color3dv(&darkColor[0])
	if !w.state {
		gl.Begin(gl.TRIANGLES)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.25, w.pos[1]+w.size[0]*0.15)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.95, w.pos[1]+w.size[1]*0.5)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.25, w.pos[1]+w.size[1]*0.85)
		gl.End()
	} else {
		gl.Begin(gl.TRIANGLES)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.15, w.pos[1]+w.size[0]*0.25)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.85, w.pos[1]+w.size[1]*0.25)
		gl.Vertex2d(w.pos[0]+w.size[0]*0.5, w.pos[1]+w.size[1]*0.95)
		gl.End()
	}
}

func (w *TriButtonWidget) State() bool {
	return w.state
}

// ---

type TriButtonExternalStateWidget struct {
	*ButtonWidget
	state func() bool
}

func NewTriButtonExternalStateWidget(pos mgl64.Vec2, state func() bool, action func()) *TriButtonExternalStateWidget {
	w := &TriButtonExternalStateWidget{ButtonWidget: NewButtonWidget(pos, action), state: state}

	return w
}

func (w *TriButtonExternalStateWidget) Render() {
	// HACK: Brute-force check the mouse pointer if it contains this widget
	isOriginHit := false
	for _, hit := range mousePointer.OriginMapping {
		if w == hit {
			isOriginHit = true
			break
		}
	}
	isHit := len(w.HoverPointers()) > 0

	// HACK: Assumes mousePointer rather than considering all connected pointing pointers
	if isOriginHit && mousePointer.State.IsActive() && isHit {
		DrawGBox(w.pos, w.size)
	} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
		DrawYBox(w.pos, w.size)
	} else {
		DrawNBox(w.pos, w.size)
	}

	if w.state() {
		DrawBorderlessBox(w.pos.Add(w.size.Mul(2.0/14)), w.size.Mul(10.0/14), mgl64.Vec3{0.9, 0.3, 0.01})
	} else {
		DrawBorderlessBox(w.pos.Add(w.size.Mul(2.0/14)), w.size.Mul(10.0/14), mgl64.Vec3{0.9, 0.9, 0.9})
	}
}

// ---

type BoxWidget struct {
	Widget
	Name string
}

var boxWidgetTooltip = NewTextLabelWidgetString(np, reflectsource.GetSourceAsString((*BoxWidget).ProcessEvent))

func (w *BoxWidget) Render() {
	// HACK: Brute-force check the mouse pointer if it contains this widget
	isOriginHit := false
	for _, hit := range mousePointer.OriginMapping {
		if w == hit {
			isOriginHit = true
			break
		}
	}
	isHit := len(w.HoverPointers()) > 0

	// HACK: Assumes mousePointer rather than considering all connected pointing pointers
	if isOriginHit && mousePointer.State.IsActive() && isHit {
		DrawGBox(w.pos, w.size)
	} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
		DrawYBox(w.pos, w.size)
	} else {
		DrawNBox(w.pos, w.size)
	}

	// Tooltip
	if isHit {
		mousePointerPositionLocal := WidgeterS{w}.GlobalToLocal(mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]})
		tooltipOffset := mgl64.Vec2{0, -4 - boxWidgetTooltip.Size()[1]}
		*boxWidgetTooltip.Pos() = w.pos.Add(mousePointerPositionLocal).Add(tooltipOffset)
		boxWidgetTooltip.Render()
	}
}
func (w *BoxWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

func (w *BoxWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == false &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		fmt.Printf("%q BoxWidget pressed!\n", w.Name)
		x, y := globalWindow.GetPos()
		globalWindow.SetPos(x-16, y)
	}
}

// ---

type WindowWidget struct {
	Widget
	chrome *CompositeWidget
	Name   string
	child  Widgeter
}

func NewWindowWidget(pos, size mgl64.Vec2, child Widgeter) *WindowWidget {
	w := &WindowWidget{Widget: NewWidget(pos, size), child: child}
	closeButton := NewButtonWidget(np, func() {
		w.Parent().(RemoveWidgeter).RemoveWidget(w)
		w.SetParent(nil) // TODO: Not sure if needed
	})
	w.chrome = NewCompositeWidget(np, []Widgeter{closeButton})
	w.chrome.SetParent(w)
	w.child.SetParent(w)
	w.Layout() // TODO: Should this be automatic from above SetParent()?
	return w
}

func (w *WindowWidget) PollLogic() {
	w.chrome.PollLogic()
	w.child.PollLogic()

	for i := range w.pos {
		w.pos[i] = math.Floor(w.pos[i] + 0.5)
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.PollLogic()
}

func (w *WindowWidget) Close() error {
	// TODO: Errors.
	_ = w.chrome.Close()
	_ = w.child.Close()
	return nil
}

func (w *WindowWidget) Layout() {
	w.size = *w.child.Size()

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *WindowWidget) LayoutNeeded() {
	w.chrome.LayoutNeeded()
	w.child.LayoutNeeded()
}

func (w *WindowWidget) Render() {
	DrawGradientBox(w.pos, mgl64.Vec2{w.size[0], fontHeight}, mgl64.Vec3{0.3, 0.3, 0.3}, nearlyWhiteColor, lightColor)

	// Title
	gl.Color3dv(&nearlyBlackColor[0])
	NewOpenGLStream(w.pos.Add(mgl64.Vec2{60})).PrintLine(w.Name)

	gl.PushMatrix()
	gl.Translated(w.pos[0], w.pos[1], 0)
	w.chrome.Render()
	gl.Translated(float64(0), float64(fontHeight+1), 0)
	w.child.Render()
	gl.PopMatrix()
}
func (w *WindowWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.Widget.ParentToLocal(ParentPosition) // HACK: Should use actual ParentToLocal properly.

	Hit := (LocalPosition[0] >= 0 &&
		LocalPosition[1] >= 0 &&
		LocalPosition[0] <= w.size[0] &&
		LocalPosition[1] <= fontHeight)

	if Hit {
		hits := []Widgeter{w}
		hits = append(hits, w.chrome.Hit(LocalPosition)...)
		return hits
	} else {
		return w.child.Hit(LocalPosition.Sub(mgl64.Vec2{0, fontHeight + 1}))
	}
}

func (w *WindowWidget) ParentToLocal(ParentPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return w.Widget.ParentToLocal(ParentPosition).Sub(mgl64.Vec2{0, fontHeight + 1})
}

func (w *WindowWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.Pointer.State.Button(0) && (inputEvent.EventTypes[event.SliderEvent] && inputEvent.InputId == 0) {
		w.pos[0] += inputEvent.Sliders[0]
		w.pos[1] += inputEvent.Sliders[1]
	}
}

// ---

func (widgets Widgeters) ContainsWidget(target Widgeter) bool {
	for _, widget := range widgets {
		if widget.ContainsWidget(widget, target) {
			return true
		}
	}
	return false
}

// ---

func DrawBorderlessBox(pos, size mgl64.Vec2, backgroundColor mgl64.Vec3) {
	gl.Color3dv(&backgroundColor[0])
	gl.Rectd(pos[0], pos[1], pos.Add(size)[0], pos.Add(size)[1])
}

func DrawBorderlessGradientBox(pos, size mgl64.Vec2, topColor, bottomColor mgl64.Vec3) {
	gl.Begin(gl.TRIANGLE_STRIP)
	gl.Color3dv(&topColor[0])
	gl.Vertex2d(pos[0], pos[1])
	gl.Vertex2d(pos.Add(size)[0], pos[1])
	gl.Color3dv(&bottomColor[0])
	gl.Vertex2d(pos[0], pos.Add(size)[1])
	gl.Vertex2d(pos.Add(size)[0], pos.Add(size)[1])
	gl.End()
}

func DrawBox(pos, size mgl64.Vec2, borderColor, backgroundColor mgl64.Vec3) {
	DrawBorderlessBox(pos.Add(mgl64.Vec2{-1, -1}), size.Add(mgl64.Vec2{2, 2}), borderColor)
	DrawBorderlessBox(pos, size, backgroundColor)
}
func DrawNBox(pos, size mgl64.Vec2) {
	DrawBox(pos, size, mgl64.Vec3{0.3, 0.3, 0.3}, nearlyWhiteColor)
}
func DrawYBox(pos, size mgl64.Vec2) {
	DrawBox(pos, size, highlightColor, nearlyWhiteColor)
}
func DrawGBox(pos, size mgl64.Vec2) {
	DrawBox(pos, size, highlightColor, grayColor)
}
func DrawLGBox(pos, size mgl64.Vec2) {
	DrawBox(pos, size, mgl64.Vec3{0.6, 0.6, 0.6}, lightColor)
}

func DrawGradientBox(pos, size mgl64.Vec2, borderColor, topColor, bottomColor mgl64.Vec3) {
	gl.Color3dv(&borderColor[0])
	gl.Rectd(pos[0]-1, pos[1]-1, pos.Add(size)[0]+1, pos.Add(size)[1]+1)
	DrawBorderlessGradientBox(pos, size, topColor, bottomColor)
}

func DrawInnerRoundedBox(pos, size mgl64.Vec2, borderColor, backgroundColor mgl64.Vec3) {
	if size[0] == 0 || size[1] == 0 {
		return
	}

	const OuterDistance = 1.5
	gl.Begin(gl.POLYGON)
	gl.Color3dv(&borderColor[0])
	gl.Vertex2d(pos[0]+OuterDistance, pos[1])
	gl.Vertex2d(pos[0], pos[1]+OuterDistance)
	gl.Vertex2d(pos[0], pos[1]-OuterDistance+size[1])
	gl.Vertex2d(pos[0]+OuterDistance, pos[1]+size[1])
	gl.Vertex2d(pos[0]-OuterDistance+size[0], pos[1]+size[1])
	gl.Vertex2d(pos[0]+size[0], pos[1]-OuterDistance+size[1])
	gl.Vertex2d(pos[0]+size[0], pos[1]+OuterDistance)
	gl.Vertex2d(pos[0]-OuterDistance+size[0], pos[1])
	gl.End()

	const InnerDistance = OuterDistance + (math.Sqrt2 - 1)
	gl.Begin(gl.POLYGON)
	gl.Color3dv(&backgroundColor[0])
	gl.Vertex2d(pos[0]+InnerDistance, pos[1]+1)
	gl.Vertex2d(pos[0]+1, pos[1]+InnerDistance)
	gl.Vertex2d(pos[0]+1, pos[1]-InnerDistance+size[1])
	gl.Vertex2d(pos[0]+InnerDistance, pos[1]-1+size[1])
	gl.Vertex2d(pos[0]-InnerDistance+size[0], pos[1]-1+size[1])
	gl.Vertex2d(pos[0]-1+size[0], pos[1]-InnerDistance+size[1])
	gl.Vertex2d(pos[0]-1+size[0], pos[1]+InnerDistance)
	gl.Vertex2d(pos[0]-InnerDistance+size[0], pos[1]+1)
	gl.End()
}

// Tau is the constant τ, which equals to 6.283185... or 2π.
// Reference: https://oeis.org/A019692
const Tau = 2 * math.Pi

func DrawCircle(pos mgl64.Vec2, size mgl64.Vec2, borderColor, backgroundColor mgl64.Vec3) {
	const x = 64

	gl.Color3dv(&borderColor[0])
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(pos[0], pos[1])
	for i := 0; i <= x; i++ {
		gl.Vertex2d(pos[0]+math.Sin(Tau*float64(i)/x)*size[0]/2, pos[1]+math.Cos(Tau*float64(i)/x)*size[1]/2)
	}
	gl.End()

	gl.Color3dv(&backgroundColor[0])
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(pos[0], pos[1])
	for i := 0; i <= x; i++ {
		gl.Vertex2d(pos[0]+math.Sin(Tau*float64(i)/x)*(size[0]/2-1), pos[1]+math.Cos(Tau*float64(i)/x)*(size[1]/2-1))
	}
	gl.End()
}

func DrawCircleBorder(pos mgl64.Vec2, size mgl64.Vec2, borderColor mgl64.Vec3) {
	DrawCircleBorderCustom(pos, size, borderColor, 1, 64, 0, 64)
}

func DrawCircleBorderCustom(pos mgl64.Vec2, size mgl64.Vec2, borderColor mgl64.Vec3, borderWidth float64, totalSlices, startSlice, endSlice int32) {
	var x = float64(totalSlices)

	gl.Color3dv(&borderColor[0])
	gl.Begin(gl.TRIANGLE_STRIP)
	for i := startSlice; i <= endSlice; i++ {
		gl.Vertex2d(pos[0]+math.Sin(Tau*float64(i)/x)*size[0]/2, pos[1]-math.Cos(Tau*float64(i)/x)*size[1]/2)
		gl.Vertex2d(pos[0]+math.Sin(Tau*float64(i)/x)*(size[0]/2-borderWidth), pos[1]-math.Cos(Tau*float64(i)/x)*(size[1]/2-borderWidth))
	}
	gl.End()
}

// ---

type KatWidget struct {
	Widget
	target      mgl64.Vec2
	rotation    float64
	mode        KatMode
	skillActive bool
}

const ShunpoRadius = 120

type KatMode uint8

const (
	/*AutoAttack KatMode = iota
	Shunpo*/

	AutoAttack KatMode = 17 * iota
	_
	Shunpo
)

func (mode KatMode) String() string {
	//fmt.Printf("%T %T\n", AutoAttack, Shunpo)
	x, _ := gist5504644.GetDocPackageAll(gist5504644.BuildPackageFromSrcDir(thisGoSourceDir()))
	for _, y := range x.Types {
		if y.Name == "KatMode" {
			for _, c := range y.Consts {
				goon.DumpExpr(c.Names, mode)
				return c.Names[mode]
			}
		}
	}
	panic(0)
}

// thisGoSourceDir returns the parent directory of the Go source file where this function was called from.
func thisGoSourceDir() string {
	_, file, _, _ := runtime.Caller(1)
	dir, _ := filepath.Split(file)
	return dir
}

func NewKatWidget(pos mgl64.Vec2) *KatWidget {
	w := &KatWidget{Widget: NewWidget(pos, mgl64.Vec2{16, 16}), target: pos}
	UniversalClock.AddChangeListener(w)
	return w
}

func (w *KatWidget) Render() {
	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer and its first mapping
	/*hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	isHit := len(w.HoverPointers()) > 0

	if !hasTypingFocus && !isHit {
		DrawCircle(w.pos, w.size, mathgl.Vec3d{0.3, 0.3, 0.3}, mathgl.Vec3d{1, 1, 1})
	} else {
		DrawCircle(w.pos, w.size, highlightColor, mathgl.Vec3d{1, 1, 1})
	}*/

	// Shadow
	{
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)

		gl.Enable(gl.BLEND)
		gl.Begin(gl.TRIANGLE_FAN)
		{
			gl.Color4d(0, 0, 0, 0.3)
			gl.Vertex2d(0, 0)
			gl.Color4d(0, 0, 0, 0)
			nSlices := 16
			PLAYER_HALF_WIDTH := 7.74597
			dShadowRadius := PLAYER_HALF_WIDTH * 1.75
			for nSlice := 0; nSlice <= nSlices; nSlice++ {
				gl.Vertex2d(math.Cos(Tau*float64(nSlice)/float64(nSlices))*dShadowRadius, math.Sin(Tau*float64(nSlice)/float64(nSlices))*dShadowRadius)
			}
		}
		gl.End()
		gl.Disable(gl.BLEND)

		gl.PopMatrix()
	}

	// eX0 Player
	{
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)
		gl.Rotated(w.rotation, 0, 0, 1)

		DrawCircleBorderCustom(np, mgl64.Vec2{16, 16}, mgl64.Vec3{1, 0, 0}, 2, 12, 1, 11)

		// Draw the gun
		{
			gl.Begin(gl.QUADS)
			gl.Vertex2d(float64(-1), -float64(3+10))
			gl.Vertex2d(float64(-1), -float64(3-1))
			gl.Vertex2d(float64(1), -float64(3-1))
			gl.Vertex2d(float64(1), -float64(3+10))
			gl.End()
		}

		gl.PopMatrix()
	}

	if w.mode == Shunpo && !w.skillActive {
		DrawCircleBorder(w.pos, mgl64.Vec2{ShunpoRadius * 2, ShunpoRadius * 2}, mgl64.Vec3{0.7, 0.7, 0.7})
	}
}

func (w *KatWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if w.pos.Sub(ParentPosition).Len() <= w.size[0]/2 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

func (w *KatWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == false &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		keyboardPointer.OriginMapping = []Widgeter{w}
	}

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true &&
		w.mode == Shunpo {
		w.target = WidgeterS{w}.GlobalToParent(mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]})
		w.skillActive = true
	}

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.Pointer.State.Button(1) {
		pointerPos := WidgeterS{w}.GlobalToParent(mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]})
		if pointerPos.Sub(w.pos).Len() > w.size[0]*2/3 || w.target.Sub(w.pos).Len() > w.size[0]*2/3 {
			w.target = pointerPos
		}
		w.mode = AutoAttack
		w.skillActive = false
	} else if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 'E' && inputEvent.Buttons[0] == true {
		w.mode = Shunpo
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && glfw.Key(inputEvent.InputId) == glfw.KeyEscape && inputEvent.Buttons[0] == true {
		if w.mode == Shunpo {
			// TODO: Make this consume the event, so the window doesn't get closed...
			w.mode = AutoAttack
		}
	}
}

func (w *KatWidget) NotifyChange() {
	var timePassed float64 = UniversalClock.TimePassed

	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer and its first mapping
	hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	var speed = float64(100.0)

	if hasTypingFocus {
		if keyboardPointer.State.Button(int(glfw.KeyLeftShift)) || keyboardPointer.State.Button(int(glfw.KeyRightShift)) {
			speed *= 0.4
		} else if keyboardPointer.State.Button(int(glfw.KeySpace)) {
			speed *= 10
		}

		if keyboardPointer.State.Button(int(glfw.KeyLeft)) && !keyboardPointer.State.Button(int(glfw.KeyRight)) {
			w.rotation -= 180 * timePassed
			redraw = true
		} else if keyboardPointer.State.Button(int(glfw.KeyRight)) && !keyboardPointer.State.Button(int(glfw.KeyLeft)) {
			w.rotation += 180 * timePassed
			redraw = true
		}

		var direction mgl64.Vec2
		if keyboardPointer.State.Button('A') && !keyboardPointer.State.Button('D') {
			direction[0] = -1
			redraw = true
		} else if keyboardPointer.State.Button('D') && !keyboardPointer.State.Button('A') {
			direction[0] = +1
			redraw = true
		}
		if keyboardPointer.State.Button('W') && !keyboardPointer.State.Button('S') {
			direction[1] = -1
			redraw = true
		} else if keyboardPointer.State.Button('S') && !keyboardPointer.State.Button('W') {
			direction[1] = +1
			redraw = true
		}
		if direction.Len() != 0 {
			rotM := mgl64.Rotate2D(mgl64.DegToRad(w.rotation))
			direction = rotM.Mul2x1(direction)

			w.target = w.pos.Add(direction.Normalize().Mul(speed * timePassed))
			w.pos = w.target
		}
	}

	if w.target.Sub(w.pos).Len() <= speed*timePassed {
		w.pos = w.target
	} else {
		moveBy := w.target.Sub(w.pos)
		moveBy = moveBy.Normalize().Mul(speed * timePassed)
		w.pos = w.pos.Add(moveBy)
		redraw = true
	}

	if w.skillActive && w.target.Sub(w.pos).Len() <= ShunpoRadius {
		w.pos = w.target
		w.mode = AutoAttack
		w.skillActive = false
	}
}

// ---

type AddWidgeter interface {
	AddWidget(Widgeter)
}

type RemoveWidgeter interface {
	RemoveWidget(Widgeter)
}

// ---

type CompositeWidget struct {
	Widget
	Widgets Widgeters
}

func NewCompositeWidget(pos mgl64.Vec2, Widgets Widgeters) *CompositeWidget {
	w := &CompositeWidget{Widget: NewWidget(pos, np), Widgets: Widgets}
	for _, widget := range w.Widgets {
		widget.SetParent(w)
	}
	w.Layout() // TODO: Should this be automatic from above SetParent()?
	return w
}

func (w *CompositeWidget) AddWidget(widget Widgeter) {
	w.Widgets = append(w.Widgets, widget)
	widget.SetParent(w)
	w.Layout()
}

func (w *CompositeWidget) RemoveWidget(target Widgeter) {
	for index, widget := range w.Widgets {
		if widget == target {
			copy(w.Widgets[index:], w.Widgets[index+1:])
			w.Widgets[len(w.Widgets)-1] = nil
			w.Widgets = w.Widgets[:len(w.Widgets)-1]
			return
		}
	}
}

func (w *CompositeWidget) PollLogic() {
	for _, widget := range w.Widgets {
		widget.PollLogic()
	}
}

func (w *CompositeWidget) Close() error {
	// TODO: Errors.
	for _, widget := range w.Widgets {
		_ = widget.Close()
	}
	return nil
}

func (w *CompositeWidget) Layout() {
	w.size = np
	for _, widget := range w.Widgets {
		bottomRight := widget.Pos().Add(*widget.Size())
		for d := 0; d < len(w.size); d++ {
			if bottomRight[d] > w.size[d] {
				w.size[d] = bottomRight[d]
			}
		}
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}
func (w *CompositeWidget) LayoutNeeded() {
	for _, widget := range w.Widgets {
		widget.LayoutNeeded()
	}
}
func (w *CompositeWidget) Render() {
	gl.Translated(w.pos[0], w.pos[1], 0)
	defer gl.Translated(-w.pos[0], -w.pos[1], 0)

	for _, widget := range w.Widgets {
		widget.Render()
	}
}
func (w *CompositeWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	hits := []Widgeter{}
	for _, widget := range w.Widgets {
		hits = append(hits, widget.Hit(LocalPosition)...)
	}

	return hits
}

// ---

type FlowLayoutType uint8

const (
	HorizontalLayout FlowLayoutType = iota
	VerticalLayout
)

type FlowLayoutWidget struct {
	CompositeWidget // THINK: Should I use a pointer or value?
	options         FlowLayoutWidgetOptions
}

type FlowLayoutWidgetOptions struct {
	FlowLayoutType
}

func NewFlowLayoutWidget(pos mgl64.Vec2, Widgets []Widgeter, options *FlowLayoutWidgetOptions) *FlowLayoutWidget {
	if options == nil {
		options = &FlowLayoutWidgetOptions{}
	}
	w := &FlowLayoutWidget{CompositeWidget: CompositeWidget{Widget: NewWidget(pos, mgl64.Vec2{}), Widgets: Widgets}, options: *options}
	// TODO: This is a hack, I'm manually overriding parents of each widget that were set in NewCompositeWidget()
	for _, widget := range w.Widgets {
		widget.SetParent(w)
	}
	w.Layout() // TODO: Should this be automatic from above SetParent()?
	return w
}

// TEST
func (w *FlowLayoutWidget) SetWidgets(widgets []Widgeter) {
	w.Widgets = widgets
	// TODO: This is a hack, I'm manually overriding parents of each widget that were set in NewCompositeWidget()
	for _, widget := range w.Widgets {
		widget.SetParent(w)
	}
	w.Layout() // TODO: Should this be automatic from above SetParent()?
}

func (w *FlowLayoutWidget) AddWidget(widget Widgeter) {
	w.Widgets = append(w.Widgets, widget)
	widget.SetParent(w)
	w.Layout()
}

func (w *FlowLayoutWidget) Layout() {
	w.size = np
	var combinedOffset float64
	for _, widget := range w.CompositeWidget.Widgets {
		pos := np
		pos[w.options.FlowLayoutType] = combinedOffset
		*widget.Pos() = pos
		combinedOffset += widget.Size()[w.options.FlowLayoutType] + 2

		bottomRight := widget.Pos().Add(*widget.Size())
		for d := 0; d < len(w.size); d++ {
			if bottomRight[d] > w.size[d] {
				w.size[d] = bottomRight[d]
			}
		}
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

// ---

type CanvasWidget struct {
	CompositeWidget
	offset  mgl64.Vec2
	options CanvasWidgetOptions

	PopupTest Widgeter
}

type CanvasWidgetOptions struct {
	Scrollable bool
}

func NewCanvasWidget(pos mgl64.Vec2, Widgets []Widgeter, options *CanvasWidgetOptions) *CanvasWidget {
	if options == nil {
		options = &CanvasWidgetOptions{}
	}
	w := &CanvasWidget{CompositeWidget: CompositeWidget{Widget: NewWidget(pos, mgl64.Vec2{}), Widgets: Widgets}, options: *options}
	for _, widget := range w.Widgets {
		widget.SetParent(w)
	}
	return w
}

func (w *CanvasWidget) AddWidget(widget Widgeter) {
	w.Widgets = append(w.Widgets, widget)
	widget.SetParent(w)
	w.Layout()
}

// HACK: Offset all widgets by (1, 1) so their border is visible. Need to generalize this.
func (w *CanvasWidget) offsetBy1Px() {
	for _, widget := range w.Widgets {
		*widget.Pos() = widget.Pos().Add(mgl64.Vec2{1, 1})
	}
}

func (w *CanvasWidget) PollLogic() {
	var timePassed float64 = UniversalClock.TimePassed

	if w.options.Scrollable {
		// HACK: Should iterate over all typing pointers, not just assume keyboard pointer and its first mapping
		// HACK: Instead of checking for exclusive focus, should have a waterfall model with low priority checking.
		hasExclusiveTypingFocus := keyboardPointer != nil && len(keyboardPointer.OriginMapping) == 1 && w == keyboardPointer.OriginMapping[0]

		if hasExclusiveTypingFocus {
			var speed = float64(1000.0)
			if keyboardPointer.State.Button(int(glfw.KeyLeftShift)) || keyboardPointer.State.Button(int(glfw.KeyRightShift)) {
				speed *= 0.4
			} else if keyboardPointer.State.Button(int(glfw.KeySpace)) {
				speed *= 10
			}

			var direction mgl64.Vec2
			if keyboardPointer.State.Button(int(glfw.KeyLeft)) && !keyboardPointer.State.Button(int(glfw.KeyRight)) {
				direction[0] = +1
				redraw = true
			} else if keyboardPointer.State.Button(int(glfw.KeyRight)) && !keyboardPointer.State.Button(int(glfw.KeyLeft)) {
				direction[0] = -1
				redraw = true
			}
			if keyboardPointer.State.Button(int(glfw.KeyUp)) && !keyboardPointer.State.Button(int(glfw.KeyDown)) {
				direction[1] = +1
				redraw = true
			} else if keyboardPointer.State.Button(int(glfw.KeyDown)) && !keyboardPointer.State.Button(int(glfw.KeyUp)) {
				direction[1] = -1
				redraw = true
			}

			if direction.Len() != 0 {
				w.offset = w.offset.Add(direction.Normalize().Mul(speed * timePassed))
			} else {
				for i := range w.offset {
					w.offset[i] = math.Floor(w.offset[i] + 0.5)
				}
			}
		}
	}

	if w.PopupTest != nil {
		w.PopupTest.PollLogic()
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.CompositeWidget.PollLogic()
}

func (w *CanvasWidget) Layout() {
	// HACK
	var windowSize0, windowSize1 int
	if globalWindow != nil {
		windowSize0, windowSize1 = globalWindow.GetSize()
	}
	windowSize := mgl64.Vec2{float64(windowSize0), float64(windowSize1)} // HACK: This is not updated as window resizes, etc.
	w.size = windowSize

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *CanvasWidget) LayoutNeeded() {
	if w.PopupTest != nil {
		w.PopupTest.LayoutNeeded()
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.CompositeWidget.LayoutNeeded()
}

func (w *CanvasWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0], w.pos[1], 0)

	// Background.
	{
		backgroundTopColor := mgl64.Vec3{52 / 255.0, 102 / 255.0, 164 / 255.0}
		backgroundBottomColor := mgl64.Vec3{227 / 255.0, 189 / 255.0, 162 / 255.0}

		DrawBorderlessGradientBox(w.pos, w.size, backgroundTopColor, backgroundBottomColor)
	}

	gl.Translated(w.offset[0], w.offset[1], 0)

	for _, widget := range w.Widgets {
		widget.Render()
	}

	if w.PopupTest != nil {
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)
		w.PopupTest.Render()
		gl.PopMatrix()
	}
}

func (w *CanvasWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Windowing && inputEvent.EventTypes[event.AxisEvent] {
		w.Layout()
	}

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// HACK: Give exclusive keyboard capture if Canvas is the only thing clicked, and assume others will steal/add focus if they want.
		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		keyboardPointer.OriginMapping = []Widgeter{w}
	}

	if w.options.Scrollable {
		if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.SliderEvent] && inputEvent.InputId == 2 {
			w.offset[1] += inputEvent.Sliders[0] * 10
			w.offset[0] += inputEvent.Sliders[1] * 10
		}
	}

	// TODO: Make this happen as a PostProcessEvent if it hasn't been processed by an earlier widget, etc.
	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		switch glfw.Key(inputEvent.InputId) {
		// TEST, DEBUG: Cmd+O shortcut to open a new window, for testing purposes
		case glfw.KeyO:
			if inputEvent.ModifierKey&glfw.ModSuper != 0 {
				w2 := NewWindowWidget(mgl64.Vec2{600, 400}, mgl64.Vec2{300, 60}, NewTextBoxWidget(np))
				w2.Name = "New Window"

				// Add new widget to canvas
				w.AddWidget(w2)

				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				keyboardPointer.OriginMapping = []Widgeter{w2}
			}

		case glfw.KeyP:
			if inputEvent.ModifierKey == glfw.ModSuper {
				textBox := NewTextBoxWidget(np)
				w.PopupTest = NewSpacerWidget(mgl64.Vec2{200, 0}, textBox)

				originalMapping := keyboardPointer.OriginMapping // HACK
				closeOnEscape := &CustomWidget{
					Widget: NewWidget(np, np),
					PollLogicFunc: func(this *CustomWidget) {
						if !keyboardPointer.OriginMapping.ContainsWidget(this.Parent()) {
							w.PopupTest = nil

							// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
							keyboardPointer.OriginMapping = originalMapping
						}
					},
					ProcessEventFunc: func(inputEvent InputEvent) {
						if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
							switch glfw.Key(inputEvent.InputId) {
							case glfw.KeyEnter:
								content := textBox.Content.Content()
								{
									globalPosition := mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]}
									localPosition := WidgeterS{w}.GlobalToLocal(globalPosition)

									body := NewTextFileWidget(np, content)

									w2 := NewWindowWidget(localPosition, mgl64.Vec2{}, body)
									w2.Name = content

									// Add new widget to canvas
									w.AddWidget(w2)

									// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
									keyboardPointer.OriginMapping = []Widgeter{w2}
								}

								w.PopupTest = nil

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							case glfw.KeyEscape:
								w.PopupTest = nil

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							}
						}
					},
				}

				// TODO: textBox.AddExtension(closeOnEscape).
				{
					closeOnEscape.SetParent(textBox)
					textBox.ExtensionsTest = append(textBox.ExtensionsTest, closeOnEscape)
				}

				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				keyboardPointer.OriginMapping = []Widgeter{textBox}
			}

		case glfw.KeyEscape:
			keepRunning = false
		}
	}
}

func (w *CanvasWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	if len(w.Widget.Hit(ParentPosition)) > 0 {
		hits := []Widgeter{w}
		for _, widget := range w.Widgets {
			hits = append(hits, widget.Hit(LocalPosition)...)
		}
		return hits
	} else {
		return nil
	}
}

func (w *CanvasWidget) ParentToLocal(ParentPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return w.Widget.ParentToLocal(ParentPosition).Sub(w.offset)
}

// ---

type CollapsibleWidget struct {
	Widget
	state *TriButtonWidget //*TriButtonExternalStateWidget
	label Widgeter         // HACK: Manually adding widgets, this doesn't scale, need to use CompositeWidget or make Widgeter naturally extendable, etc.
	child Widgeter
}

func NewCollapsibleWidget(pos mgl64.Vec2, child Widgeter, title string) *CollapsibleWidget {
	w := &CollapsibleWidget{Widget: NewWidget(pos, np), child: child}
	w.child.SetParent(w)

	//state := true
	//w.state = NewTriButtonExternalStateWidget(np, func() bool { return state }, func() { state = !state })
	w.state = NewTriButtonWidget(np, func() {})
	//w.state.state = true // HACK
	w.state.SetParent(w) // For its Layout() to work...

	w.label = NewTextLabelWidgetString(mgl64.Vec2{w.state.Size()[0] + 2, 0}, title) // HACK, should use FlowLayout or something
	w.label.SetParent(w)                                                            // For its Layout() to work...

	// HACK: Set position of child
	w.child.Pos()[0] = w.state.Size()[0] + 2
	w.child.Pos()[1] = w.state.Size()[1] + 2

	// TODO: This needs to be automated, easy to forget, moved into Layout2(), etc.
	w.Layout() // TODO: Should this be automatic from above SetParent()?

	return w
}

func (w *CollapsibleWidget) PollLogic() {
	w.state.PollLogic()
	w.label.PollLogic()

	if w.state.State() {
		w.child.PollLogic()
	}
}

func (w *CollapsibleWidget) Close() error {
	// TODO: Errors.
	_ = w.state.Close()
	_ = w.label.Close()
	_ = w.child.Close()
	return nil
}

func (w *CollapsibleWidget) Layout() {
	// HACK
	Widgets := []Widgeter{w.state, w.label}
	if w.state.State() {
		Widgets = append(Widgets, w.child)
	}

	w.size = np
	for _, widget := range Widgets {
		bottomRight := widget.Pos().Add(*widget.Size())
		for d := 0; d < len(w.size); d++ {
			if bottomRight[d] > w.size[d] {
				w.size[d] = bottomRight[d]
			}
		}
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *CollapsibleWidget) LayoutNeeded() {
	w.state.LayoutNeeded()
	w.label.LayoutNeeded()

	if w.state.State() {
		w.child.LayoutNeeded()
	}
}

func (w *CollapsibleWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0], w.pos[1], 0)

	w.state.Render()
	w.label.Render()

	if w.state.State() {
		w.child.Render()
	}
}

func (w *CollapsibleWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	hits := w.state.Hit(LocalPosition)
	if w.state.State() {
		hits = append(hits, w.child.Hit(LocalPosition)...)
	}

	return hits
}

// ---

type BackgroundWidget struct {
	Widget
	child  Widgeter
	border int
}

func NewBackgroundWidget(pos mgl64.Vec2, child Widgeter) *BackgroundWidget {
	w := &BackgroundWidget{Widget: NewWidget(pos, np), child: child, border: 2}
	w.child.SetParent(w)
	w.Layout() // TODO: Should this be automatic from above SetParent()?
	return w
}

func (w *BackgroundWidget) PollLogic() {
	w.child.PollLogic()

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.PollLogic()
}

func (w *BackgroundWidget) Close() error {
	// TODO: Errors.
	_ = w.child.Close()
	return nil
}

func (w *BackgroundWidget) Layout() {
	w.Widget.size = w.child.Size().Add(mgl64.Vec2{float64(w.border * 2), float64(w.border * 2)})

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *BackgroundWidget) LayoutNeeded() {
	w.child.LayoutNeeded()

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.LayoutNeeded()
}

func (w *BackgroundWidget) Render() {
	DrawBox(w.pos, w.size, lightColor, lightColor)

	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0]+float64(w.border), w.pos[1]+float64(w.border), 0)

	w.child.Render()
}

func (w *BackgroundWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	hits := w.child.Hit(LocalPosition)

	return hits
}

func (w *BackgroundWidget) ParentToLocal(ParentPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return w.Widget.ParentToLocal(ParentPosition).Sub(mgl64.Vec2{float64(w.border), float64(w.border)})
}

// ---

type OptionalHighlighter struct {
	highlighter Highlighter
	stateFunc   func() bool
}

func NewOptionalHighlighter(highlighter Highlighter, stateFunc func() bool) *OptionalHighlighter {
	return &OptionalHighlighter{
		highlighter: highlighter,
		stateFunc:   stateFunc,
	}
}

func (this *OptionalHighlighter) Highlighter() Highlighter {
	if !this.stateFunc() {
		return nil
	}
	return this.highlighter
}

// ---

type ScrollPaneWidget struct {
	Widget
	child Widgeter
}

func NewScrollPaneWidget(pos, size mgl64.Vec2, child Widgeter) *ScrollPaneWidget {
	w := &ScrollPaneWidget{Widget: NewWidget(pos, size), child: child}
	w.child.SetParent(w)
	return w
}

func (w *ScrollPaneWidget) PollLogic() {
	w.child.PollLogic()
}

func (w *ScrollPaneWidget) Close() error {
	// TODO: Errors.
	_ = w.child.Close()
	return nil
}

func (w *ScrollPaneWidget) Layout() {
	// Keep the child widget within the scroll pane
	for i := 0; i < 2; i++ {
		if w.child.Pos()[i]+w.child.Size()[i] < w.size[i] {
			w.child.Pos()[i] = w.size[i] - w.child.Size()[i]
		}

		if w.child.Pos()[i] > 0 {
			w.child.Pos()[i] = 0
		}
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

/*func (w *ScrollPaneWidget) scrollToPoint(target mathgl.Vec2d) {
	for i := 0; i < 2; i++ {
		if w.child.Pos()[i]+target[i] < 0 {
			w.child.Pos()[i] = -target[i]
		} else if w.child.Pos()[i]+target[i] > w.size[i] {
			w.child.Pos()[i] = w.size[i] - target[i]
		}
	}
}*/

func (w *ScrollPaneWidget) ScrollToArea(target, size mgl64.Vec2) {
	for i := 0; i < 2; i++ {
		// Move the minimum amount that increases overlap
		w.child.Pos()[i] += math.Min(math.Dim(-w.child.Pos()[i], target[i]), math.Dim(-w.child.Pos()[i]+w.size[i], target[i]+size[i]))
		w.child.Pos()[i] -= math.Min(math.Dim(target[i], -w.child.Pos()[i]), math.Dim(target[i]+size[i], -w.child.Pos()[i]+w.size[i]))
	}

	// TODO: Needed?
	//w.Layout()
}

func (w *ScrollPaneWidget) CenterOnArea(target, size mgl64.Vec2) {
	for i := 0; i < 2; i++ {
		w.child.Pos()[i] = -(target[i] + size[i]/2) + w.size[i]/2
	}

	// This is needed to normalize the view area, as the above potentially places the viewport outside of the widget
	w.Layout()
}

func (w *ScrollPaneWidget) ScrollToBottom() {
	w.child.Pos()[1] = w.child.Pos()[1] - w.size[1]

	// TODO: This shouldn't be needed if above logic is smarter.
	// This is needed to normalize the view area, as the above potentially places the viewport outside of the widget
	w.Layout()
}

func NearInt64(value float64) int64 {
	if value >= 0 {
		return int64(value + 0.5)
	} else {
		return int64(value - 0.5)
	}
}

func SetScissor(pos, size mgl64.Vec2) {
	var ModelMatrix [16]float64
	var ProjectionMatrix [16]float64
	var Viewport [4]int32

	gl.GetDoublev(gl.MODELVIEW_MATRIX, &ModelMatrix[0])
	gl.GetDoublev(gl.PROJECTION_MATRIX, &ProjectionMatrix[0])
	gl.GetIntegerv(gl.VIEWPORT, &Viewport[0])

	p0 := mgl64.Project(mgl64.Vec3{pos[0], pos[1] + size[1] /* Inverted y coordinate. */, 0},
		mgl64.Mat4{ModelMatrix[0], ModelMatrix[1], ModelMatrix[2], ModelMatrix[3], ModelMatrix[4], ModelMatrix[5], ModelMatrix[6], ModelMatrix[7], ModelMatrix[8], ModelMatrix[9], ModelMatrix[10], ModelMatrix[11], ModelMatrix[12], ModelMatrix[13], ModelMatrix[14], ModelMatrix[15]},
		mgl64.Mat4{ProjectionMatrix[0], ProjectionMatrix[1], ProjectionMatrix[2], ProjectionMatrix[3], ProjectionMatrix[4], ProjectionMatrix[5], ProjectionMatrix[6], ProjectionMatrix[7], ProjectionMatrix[8], ProjectionMatrix[9], ProjectionMatrix[10], ProjectionMatrix[11], ProjectionMatrix[12], ProjectionMatrix[13], ProjectionMatrix[14], ProjectionMatrix[15]},
		int(Viewport[0]), int(Viewport[1]), int(Viewport[2]), int(Viewport[3]))
	p1 := mgl64.Project(mgl64.Vec3{size[0], size[1], 0},
		mgl64.Mat4{ModelMatrix[0], ModelMatrix[1], ModelMatrix[2], ModelMatrix[3], ModelMatrix[4], ModelMatrix[5], ModelMatrix[6], ModelMatrix[7], ModelMatrix[8], ModelMatrix[9], ModelMatrix[10], ModelMatrix[11], ModelMatrix[12], ModelMatrix[13], ModelMatrix[14], ModelMatrix[15]},
		mgl64.Mat4{ProjectionMatrix[0], ProjectionMatrix[1], ProjectionMatrix[2], ProjectionMatrix[3], ProjectionMatrix[4], ProjectionMatrix[5], ProjectionMatrix[6], ProjectionMatrix[7], ProjectionMatrix[8], ProjectionMatrix[9], ProjectionMatrix[10], ProjectionMatrix[11], ProjectionMatrix[12], ProjectionMatrix[13], ProjectionMatrix[14], ProjectionMatrix[15]},
		int(Viewport[0]), int(Viewport[1]), int(Viewport[2]), int(Viewport[3]))
	p2 := mgl64.Project(mgl64.Vec3{0, 0, 0},
		mgl64.Mat4{ModelMatrix[0], ModelMatrix[1], ModelMatrix[2], ModelMatrix[3], ModelMatrix[4], ModelMatrix[5], ModelMatrix[6], ModelMatrix[7], ModelMatrix[8], ModelMatrix[9], ModelMatrix[10], ModelMatrix[11], ModelMatrix[12], ModelMatrix[13], ModelMatrix[14], ModelMatrix[15]},
		mgl64.Mat4{ProjectionMatrix[0], ProjectionMatrix[1], ProjectionMatrix[2], ProjectionMatrix[3], ProjectionMatrix[4], ProjectionMatrix[5], ProjectionMatrix[6], ProjectionMatrix[7], ProjectionMatrix[8], ProjectionMatrix[9], ProjectionMatrix[10], ProjectionMatrix[11], ProjectionMatrix[12], ProjectionMatrix[13], ProjectionMatrix[14], ProjectionMatrix[15]},
		int(Viewport[0]), int(Viewport[1]), int(Viewport[2]), int(Viewport[3]))

	pos0 := NearInt64(p0[0])
	pos1 := NearInt64(p0[1])
	size0 := NearInt64(p1[0] - p2[0])
	size1 := NearInt64(p2[1] - p1[1])

	// Crop the scissor box by the parent scissor box
	// TODO

	gl.Scissor(int32(pos0), int32(pos1), int32(size0), int32(size1))
}

func (w *ScrollPaneWidget) LayoutNeeded() {
	w.child.LayoutNeeded()
}

func (w *ScrollPaneWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0], w.pos[1], 0)

	SetScissor(mgl64.Vec2{-1, -1}, w.size.Add(mgl64.Vec2{2, 2}))
	gl.Enable(gl.SCISSOR_TEST)

	w.child.Render()

	gl.Disable(gl.SCISSOR_TEST)

	// Draw scrollbars, if needed
	{
		const scrollbarWidth = 2

		// Vertical
		if w.child.Size()[1] > w.size[1] {
			DrawBorderlessBox(mgl64.Vec2{w.size[0] - scrollbarWidth + 1, -w.child.Pos()[1]/w.child.Size()[1]*(w.size[1]+2) - 1},
				mgl64.Vec2{scrollbarWidth, w.size[1] / w.child.Size()[1] * (w.size[1] + 2)},
				darkColor)
		}

		// Horizontal
		if w.child.Size()[0] > w.size[0] {
			DrawBorderlessBox(mgl64.Vec2{-w.child.Pos()[0]/w.child.Size()[0]*(w.size[0]+2) - 1, w.size[1] - scrollbarWidth + 1},
				mgl64.Vec2{w.size[0] / w.child.Size()[0] * (w.size[0] + 2), scrollbarWidth},
				darkColor)
		}
	}
}

func (w *ScrollPaneWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	if len(w.Widget.Hit(ParentPosition)) > 0 {
		hits := []Widgeter{w}
		hits = append(hits, w.child.Hit(LocalPosition)...)
		return hits
	} else {
		return nil
	}
}

func (w *ScrollPaneWidget) ProcessEvent(inputEvent InputEvent) {
	var moved bool

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.SliderEvent] && inputEvent.InputId == 2 {
		w.child.Pos()[0] += inputEvent.Sliders[1] * 10
		w.child.Pos()[1] += inputEvent.Sliders[0] * 10
		moved = true
	}

	// TODO: This should move cursor so it's on screen?
	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		switch glfw.Key(inputEvent.InputId) {
		case glfw.KeyUp:
			if inputEvent.ModifierKey == glfw.ModControl|glfw.ModAlt {
				w.child.Pos()[1] += fontHeight
				moved = true
			}
		case glfw.KeyDown:
			if inputEvent.ModifierKey == glfw.ModControl|glfw.ModAlt {
				w.child.Pos()[1] -= fontHeight
				moved = true
			}
		}
	}

	if moved {
		// HACK: Snap to nearest point. This prevents smaller scroll increments from being possible.
		w.child.Pos()[0] = float64(NearInt64(w.child.Pos()[0]))
		w.child.Pos()[1] = float64(NearInt64(w.child.Pos()[1]))

		w.Layout()
	}
}

// ---

type SpacerWidget struct {
	Widget
	child  Widgeter
	border int
}

func NewSpacerWidget(pos mgl64.Vec2, child Widgeter) *SpacerWidget {
	w := &SpacerWidget{Widget: NewWidget(pos, np), child: child, border: 2}
	w.child.SetParent(w)
	w.Layout() // TODO: Should this be automatic from above SetParent()?
	return w
}

func (w *SpacerWidget) PollLogic() {
	w.child.PollLogic()

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.PollLogic()
}

func (w *SpacerWidget) Close() error {
	// TODO: Errors.
	_ = w.child.Close()
	return nil
}

func (w *SpacerWidget) Layout() {
	w.Widget.size = w.child.Size().Add(mgl64.Vec2{float64(w.border * 2), float64(w.border * 2)})

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *SpacerWidget) LayoutNeeded() {
	w.child.LayoutNeeded()

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.LayoutNeeded()
}

func (w *SpacerWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0]+float64(w.border), w.pos[1]+float64(w.border), 0)

	w.child.Render()
}

func (w *SpacerWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	LocalPosition := w.ParentToLocal(ParentPosition)

	hits := w.child.Hit(LocalPosition)

	return hits
}

func (w *SpacerWidget) ParentToLocal(ParentPosition mgl64.Vec2) (LocalPosition mgl64.Vec2) {
	return w.Widget.ParentToLocal(ParentPosition).Sub(mgl64.Vec2{float64(w.border), float64(w.border)})
}

// ---

type UnderscoreSepToCamelCaseWidget struct {
	Widget
	window *glfw.Window
}

func (w *UnderscoreSepToCamelCaseWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0], w.pos[1], 0)

	//s := w.window.GetClipboardString()
	s := "get_clipboard_string"
	// E.g., get_clipboard_string -> GetClipboardString
	s += " -> " + gist6003701.UnderscoreSepToCamelCase(s)
	w.size[0] = float64(8 * len(s))
	w.size[1] = 16

	gl.Color3d(0.3, 0.3, 0.3)
	gl.Rectd(0-1, 0-1, w.size[0]+1, w.size[1]+1)
	gl.Color3d(1, 1, 1)
	gl.Rectd(0, 0, w.size[0], w.size[1])

	gl.Color3d(0, 0, 0)
	NewOpenGLStream(mgl64.Vec2{0, 0}).PrintText(s)
}

// ---

type ChannelExpeWidget struct {
	*FlowLayoutWidget
	cmd *exec.Cmd
	ch  ChanWriter
}

func NewChannelExpeWidget(pos mgl64.Vec2) *ChannelExpeWidget {
	w := &ChannelExpeWidget{ch: make(ChanWriter)}
	action := func() {
		// Comments are currently not preserved in the tooltip

		if w.cmd == nil {
			w.cmd = exec.Command("ping", "google.com")
			w.cmd.Stdout = w.ch
			w.cmd.Stderr = w.ch
			err := w.cmd.Start()
			if err != nil {
				panic(err)
			}
			go w.cmd.Wait() // It looks like I need to wait for the process, else it doesn't terminate properly
		} else {
			//w.cmd.Process.Kill()
			w.cmd.Process.Signal(os.Interrupt)
			w.cmd = nil
		}
	}
	w.FlowLayoutWidget = NewFlowLayoutWidget(pos,
		[]Widgeter{
			NewTriButtonExternalStateWidget(np, func() bool { return w.cmd != nil }, action),
			NewTextBoxWidget(np),
		}, nil)

	UniversalClock.AddChangeListener(w)

	return w
}

func (w *ChannelExpeWidget) NotifyChange() {
	select {
	case b, ok := <-w.ch:
		if ok {
			box := w.FlowLayoutWidget.Widgets[1].(*TextBoxWidget)
			SetViewGroup(box.Content, box.Content.Content()+string(b))
			redraw = true
		}
	default:
	}
}

// ---

type FooWidget2 struct {
	*FlowLayoutWidget
}

func NewFooWidget2(pos mgl64.Vec2) Widgeter {
	listWidget := NewTextBoxWidget(np)
	listWidgetScrollPane := NewScrollPaneWidget(np, mgl64.Vec2{fontWidth * 80, fontHeight * 12}, listWidget)
	searchField := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true})

	actions := &CustomWidget{
		Widget: NewWidget(np, np),
		ProcessEventFunc: func(inputEvent InputEvent) {
			if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
				switch glfw.Key(inputEvent.InputId) {
				case glfw.KeyEnter:
					type tokenText struct {
						t rune
						s string
					}

					var s textscanner.Scanner
					s.Init(strings.NewReader(searchField.Content.Content()))
					s.Mode = textscanner.ScanIdents | textscanner.ScanStrings

					var tokens []tokenText
					for tok := s.Scan(); tok != textscanner.EOF; tok = s.Scan() {
						tokens = append(tokens, tokenText{t: tok, s: s.TokenText()})
					}

					var out string
					var cmd []string
					for _, tt := range tokens {
						out += fmt.Sprintf("%v:%v ", textscanner.TokenString(tt.t), tt.s)
						cmd = append(cmd, tt.s)
					}

					switch {
					case len(cmd) == 1 && cmd[0] == "exit":
						fmt.Println("Closing.")
						keepRunning = false
					}

					SetViewGroup(listWidget.Content, listWidget.Content.Content()+out+"\n")
					SetViewGroup(searchField.Content, "")
				}
			}
		},
	}
	searchField.ExtensionsTest = append(searchField.ExtensionsTest, actions)

	widgets := []Widgeter{listWidgetScrollPane, searchField}

	w := &FooWidget2{FlowLayoutWidget: NewFlowLayoutWidget(pos, widgets, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout})}

	// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
	keyboardPointer.OriginMapping = []Widgeter{searchField}

	return w
}

type FooWidget struct {
	Widget
	text string
}

func NewFooWidget(pos mgl64.Vec2) Widgeter {
	w := &FooWidget{Widget: NewWidget(pos, mgl64.Vec2{180, 30})}
	return w
}

func (w *FooWidget) Render() {
	hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	if hasTypingFocus {
		DrawYBox(w.pos, w.size)
	} else {
		DrawNBox(w.pos, w.size)
	}

	glt := NewOpenGLStream(w.pos)
	gl.Color3d(0, 0, 0)
	glt.PrintText(w.text)

	if hasTypingFocus {
		expandedCaretPosition, caretLine := len(w.text), 0

		// Draw caret
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)
		gl.Color3d(0, 0, 0)
		gl.Recti(int32(expandedCaretPosition*fontWidth-1), int32(caretLine*fontHeight), int32(expandedCaretPosition*fontWidth+1), int32(caretLine*fontHeight)+fontHeight)
		gl.PopMatrix()
	}
}

func (w *FooWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		if !keyboardPointer.OriginMapping.ContainsWidget(w) {
			keyboardPointer.OriginMapping = []Widgeter{w}
		}
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		switch glfw.Key(inputEvent.InputId) {
		case glfw.KeyBackspace:
			if len(w.text) > 0 {
				w.text = w.text[:len(w.text)-1]
			}
		}
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.CharacterEvent] && inputEvent.InputId < 128 {
		w.text += string(inputEvent.InputId)
	}
}

func (w *FooWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

// ---

type commandNode struct {
	w        *LiveCmdExpeWidget
	template CmdFactory
	DepNode2
}

func (this *commandNode) Update() {
	if this.w.cmd != nil && this.w.cmd.ProcessState == nil {
		//w.cmd.Process.Kill()
		this.w.cmd.Process.Signal(os.Interrupt)
		//w.cmd.Process.Signal(syscall.SIGTERM)
		//fmt.Println("sigint'ed process", this.w.cmd.Process.Pid)
		this.w.cmd = nil
	}

	SetViewGroup(this.w.Content, "")

	MakeUpdatedLock.Unlock() // HACK: Needed because (*CmdTemplateDynamic2) NewCommand() calls MakeUpdated().
	this.w.cmd = this.template.NewCommand()
	MakeUpdatedLock.Lock() // HACK
	this.w.stdoutChan = make(ChanWriter)
	this.w.stderrChan = make(ChanWriter)
	this.w.cmd.Stdout = this.w.stdoutChan
	this.w.cmd.Stderr = this.w.stderrChan

	err := this.w.cmd.Start()
	if err != nil {
		this.w.cmd = nil
		return
	}
	//fmt.Printf("started new process %v %+v\n", this.w.cmd.Process.Pid, this.w.cmd.Args)

	go func(cmd *exec.Cmd) {
		_ = cmd.Wait()
		//fmt.Println("waited til end of", cmd.Process.Pid)
		this.w.finishedChan <- cmd.ProcessState
	}(this.w.cmd)
}

type LiveCmdExpeWidget struct {
	*TextBoxWidget
	commandNode    *commandNode
	cmd            *exec.Cmd
	stdoutChan     ChanWriter
	stderrChan     ChanWriter
	finishedChan   chan *os.ProcessState
	DepNode2Manual // FinishedDepNode2
}

func NewLiveCmdExpeWidget(pos mgl64.Vec2, dependees []DepNode2I, template CmdFactory) *LiveCmdExpeWidget {
	w := &LiveCmdExpeWidget{TextBoxWidget: NewTextBoxWidget(pos), finishedChan: make(chan *os.ProcessState)}

	// THINK: The only reason to have a separate command node is because current NotifyChange() does not tell the originator of change, so I can't tell UniversalClock's changes from dependee changes (and I need to do different actions for each)
	w.commandNode = &commandNode{w: w, template: template}
	w.commandNode.AddSources(dependees...)

	return w
}

func (w *LiveCmdExpeWidget) PollLogic() {
	MakeUpdated(w.commandNode) // THINK: Is this a hack or is this the way to go?
	w.layout2Test()

	w.TextBoxWidget.PollLogic()
}

func (w *LiveCmdExpeWidget) Close() error {
	// TODO: Kill live cmd...

	// TODO: Errors.
	_ = w.TextBoxWidget.Close()
	return nil
}

func (w *LiveCmdExpeWidget) layout2Test() {
	select {
	case b, ok := <-w.stdoutChan:
		if ok {
			SetViewGroup(w.Content, w.Content.Content()+string(b))
			redraw = true
		}
	default:
	}

	select {
	case b, ok := <-w.stderrChan:
		if ok {
			SetViewGroup(w.Content, w.Content.Content()+string(b))
			redraw = true
		}
	default:
	}

	select {
	/*case processState := <-w.finishedChan:
	if processState.Success() {
		// TODO: Is ChangeListener stuff a good fit for these not-really-change events?
		w.SuccessDepNode.NotifyAllListeners()
	}*/
	case <-w.finishedChan:
		ExternallyUpdated(w)
	default:
	}
}

func (w *LiveCmdExpeWidget) Render() {
	w.TextBoxWidget.Render()
}

// ---

type WriterNotifier struct {
	io.Writer
	n func()
}

func (wn *WriterNotifier) Write(p []byte) (n int, err error) {
	wn.n()
	n, err = wn.Writer.Write(p)
	wn.n()
	return
}

type pipeNode struct {
	w *LivePipeExpeWidget
	p PipeFactory
	s *pipe.State
	DepNode2
}

func (this *pipeNode) Update() {
	if this.s != nil {
		this.s.Kill()
		this.s = nil
	}

	SetViewGroup(this.w.Content, "")

	notify := func() {
		//println("yo, notify, yo?")
		//redraw = true
		//glfw.PostEmptyEvent()
	}
	this.w.stdoutChan = &WriterNotifier{make(ChanWriter), notify}
	this.w.stderrChan = &WriterNotifier{make(ChanWriter), notify}
	var p pipe.Pipe
	MakeUpdatedLock.Unlock() // HACK: Needed because NewPipe() calls MakeUpdated().
	this.s, p = this.p.NewPipe(this.w.stdoutChan, this.w.stderrChan)
	MakeUpdatedLock.Lock() // HACK

	go func(s *pipe.State, p pipe.Pipe) {
		err := p(s)
		if err == nil {
			err = this.s.RunTasks()
		}
		//close(this.w.stdoutChan) // This is causing panics because pipe tries to write to closed channel.
		//close(this.w.stderrChan)
		this.w.finishedChan <- err
	}(this.s, p)
}

type LivePipeExpeWidget struct {
	*TextBoxWidget
	pipeNode       *pipeNode
	stdoutChan     *WriterNotifier
	stderrChan     *WriterNotifier
	finishedChan   chan error
	DepNode2Manual // FinishedDepNode2
}

func NewLivePipeExpeWidget(pos mgl64.Vec2, dependees []DepNode2I, p PipeFactory) *LivePipeExpeWidget {
	w := &LivePipeExpeWidget{TextBoxWidget: NewTextBoxWidget(pos), finishedChan: make(chan error)}

	// THINK: The only reason to have a separate pipe node is because current NotifyChange() does not tell the originator of change, so I can't tell UniversalClock's changes from dependee changes (and I need to do different actions for each)
	w.pipeNode = &pipeNode{w: w, p: p}
	w.pipeNode.AddSources(dependees...)

	return w
}

func (w *LivePipeExpeWidget) PollLogic() {
	MakeUpdated(w.pipeNode) // THINK: Is this a hack or is this the way to go?
	w.layout2Test()

	w.TextBoxWidget.PollLogic()
}

func (w *LivePipeExpeWidget) Close() error {
	if w.pipeNode.s != nil {
		w.pipeNode.s.Kill()
		w.pipeNode.s = nil
	}

	// TODO: Errors.
	_ = w.TextBoxWidget.Close()
	return nil
}

func (w *LivePipeExpeWidget) layout2Test() {
	select {
	case b, ok := <-w.stdoutChan.Writer.(ChanWriter):
		if ok {
			SetViewGroup(w.Content, w.Content.Content()+string(b))
			redraw = true
		}
	default:
	}

	select {
	case b, ok := <-w.stderrChan.Writer.(ChanWriter):
		if ok {
			SetViewGroup(w.Content, w.Content.Content()+string(b))
			redraw = true
		}
	default:
	}

	select {
	/*case processState := <-w.finishedChan:
	if processState.Success() {
		// TODO: Is ChangeListener stuff a good fit for these not-really-change events?
		w.SuccessDepNode.NotifyAllListeners()
	}*/
	case <-w.finishedChan:
		ExternallyUpdated(w)
	default:
	}
}

func (w *LivePipeExpeWidget) Render() {
	w.TextBoxWidget.Render()
}

// ---

type actionNode struct {
	owner  *LiveGoroutineExpeWidget
	params func() interface{}
	action func(interface{}) string
	DepNode2
}

func (this *actionNode) Update() {
	// TODO: See if it's possible to have a _general_ solution to EOL goroutines whose work has become obsolete
	// In order not to overload the system, only start a new goroutine if all others have finished
	if this.owner.lastStartedT == this.owner.lastFinishedT {
		this.owner.lastStartedT++
		ti := this.owner.lastStartedT

		//this.owner.Content.Set(this.action()); _ = ti
		go func(params interface{}) {
			//defer close(outChan)
			//started := time.Now()
			ts := timestampString{this.action(params), ti}
			//fmt.Println(time.Since(started).Seconds())
			this.owner.outChan <- ts
		}(this.params())
	} else {
		// TODO: Make the update happen later, once the current goroutine is done?
	}
}

type timestampString struct {
	s string
	t uint32
}

type LiveGoroutineExpeWidget struct {
	*FlowLayoutWidget
	actionNode                  *actionNode
	outChan                     chan timestampString
	lastStartedT, lastFinishedT uint32
	live                        bool
}

func NewLiveGoroutineExpeWidget(pos mgl64.Vec2, live bool, dependees []DepNode2I, params func() interface{}, action func(interface{}) string) *LiveGoroutineExpeWidget {
	w := &LiveGoroutineExpeWidget{outChan: make(chan timestampString), live: live}

	refreshButton := NewButtonWidget(np, func() { MakeUpdated(w.actionNode) })
	liveToggle := NewTriButtonExternalStateWidget(np, func() bool { return w.live }, func() { w.live = !w.live })
	textBoxWidget := NewTextBoxWidget(pos)

	w.FlowLayoutWidget = NewFlowLayoutWidget(pos, []Widgeter{refreshButton, liveToggle, textBoxWidget}, nil)

	// THINK: The only reason to have a separate action node is because current NotifyChange() does not tell the originator of change, so I can't tell UniversalClock's changes from dependee changes (and I need to do different actions for each)
	w.actionNode = &actionNode{owner: w, params: params, action: action}
	w.actionNode.AddSources(dependees...)

	return w
}

func (w *LiveGoroutineExpeWidget) PollLogic() {
	if w.live {
		MakeUpdated(w.actionNode) // THINK: Is this a hack or is this the way to go?
	}
	w.layout2Test()

	w.FlowLayoutWidget.PollLogic()
}

func (w *LiveGoroutineExpeWidget) Close() error {
	// TODO: Kill live goroutine?

	// TODO: Errors.
	_ = w.FlowLayoutWidget.Close()
	return nil
}

func (w *LiveGoroutineExpeWidget) layout2Test() {
	select {
	case s, ok := <-w.outChan:
		if ok {
			if s.t > w.lastFinishedT {
				w.lastFinishedT = s.t

				SetViewGroup(w.Widgets[2].(*TextBoxWidget).Content, s.s) // HACK: Should get Content in a better way
				redraw = true
			}
		}
	default:
	}
}

func (w *LiveGoroutineExpeWidget) Render() {
	w.FlowLayoutWidget.Render()
}

// ---

type ConnectionWidget struct {
	Widget
}

func NewConnectionWidget(pos mgl64.Vec2) *ConnectionWidget {
	w := &ConnectionWidget{Widget: NewWidget(pos, mgl64.Vec2{fontHeight, fontHeight})}
	return w
}

func (w *ConnectionWidget) Render() {
	// HACK: Brute-force check the mouse pointer if it contains this widget
	isOriginHit := false
	for _, hit := range mousePointer.OriginMapping {
		if w == hit {
			isOriginHit = true
			break
		}
	}
	isHit := len(w.HoverPointers()) > 0

	// HACK: Assumes mousePointer rather than considering all connected pointing pointers
	if isOriginHit && mousePointer.State.IsActive() && isHit {
		DrawCircle(w.pos, w.size, highlightColor, nearlyWhiteColor)
	} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
		DrawCircle(w.pos, w.size, highlightColor, nearlyWhiteColor)
	} else {
		DrawCircle(w.pos, w.size, mgl64.Vec3{0.3, 0.3, 0.3}, nearlyWhiteColor)
	}

	DrawCircle(w.pos, w.size.Mul(0.5625), mgl64.Vec3{0.3, 0.3, 0.3}, mgl64.Vec3{0.3, 0.3, 0.3})

	if isOriginHit && mousePointer.State.IsActive() {
		gl.PushMatrix()
		defer gl.PopMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)

		globalPosition := mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]}
		localPosition := WidgeterS{w}.GlobalToLocal(globalPosition)

		gl.Color3d(0, 0, 0)
		gl.Begin(gl.LINES)
		gl.Vertex2d(float64(0), float64(0))
		gl.Vertex2d(localPosition[0], localPosition[1])
		gl.End()
	}
}

func (w *ConnectionWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if w.pos.Sub(ParentPosition).Len() <= w.size[0]/2 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

// ---

type HttpServerTestWidget struct {
	*FlowLayoutWidget
	started        bool
	stopServerChan chan struct{}
}

func NewHttpServerTestWidget(pos mgl64.Vec2) *HttpServerTestWidget {
	const httpServerAddr = ":8060"

	w := &HttpServerTestWidget{stopServerChan: make(chan struct{})}
	action := func() {
		if !w.started {
			go func() {
				err := httpstoppable.ListenAndServe(httpServerAddr, nil, w.stopServerChan)
				if err != nil {
					log.Println("HttpServerTestWidget:", err)
					w.started = false
				}
			}()
		} else {
			w.stopServerChan <- struct{}{}
		}
		w.started = !w.started // TODO: Factor this out to toggle-button?
	}
	action()
	w.FlowLayoutWidget = NewFlowLayoutWidget(pos,
		[]Widgeter{
			NewTriButtonExternalStateWidget(np, func() bool { return w.started }, action),
		}, nil)
	if publicIps, err := getPublicIps(); err == nil && len(publicIps) >= 1 {
		w.FlowLayoutWidget.AddWidget(NewTextLabelWidgetString(np, "http://"+publicIps[0]+httpServerAddr))
	}

	return w
}

// getPublicIps returns a string slice of non-loopback IPs.
func getPublicIps() (publicIps []string, err error) {
	ifis, err := net.Interfaces()
	if err != nil {
		return nil, err
	}
	for _, ifi := range ifis {
		addrs, err := ifi.Addrs()
		if err != nil {
			return nil, err
		}
		for _, addr := range addrs {
			ipNet, ok := addr.(*net.IPNet)
			if !ok {
				continue
			}
			ip4 := ipNet.IP.To4()
			if ip4 == nil || ip4.IsLoopback() {
				continue
			}
			publicIps = append(publicIps, ipNet.IP.String())
		}
	}
	return publicIps, nil
}

// ---

type VcsLocalInvalidator struct {
	DepNode2
	init bool

	Repo *exp13.VcsState
}

func (this *VcsLocalInvalidator) Update() {
	// Don't do anything for initialization, only for further changes.
	if !this.init {
		this.init = true
		return
	}

	//fileView := this.GetSources()[0].(*FileView)
	//println("changed:", fileView.path, "of:", this.Repo.Vcs.RootPath()[32:])

	// Invalidate the Repo.VcsLocal.
	ExternallyUpdated(this.Repo.VcsLocal.GetSources()[1].(DepNode2ManualI))
}

func (this *VcsLocalInvalidator) SetTarget() {
}

// ---

type FileOpener struct {
	editor     ViewGroupI
	openedFile *FileView

	DepNode2
}

func NewFileOpener(editor ViewGroupI) *FileOpener {
	this := &FileOpener{editor: editor}
	return this
}

func (this *FileOpener) Update() {
	if this.openedFile != nil {
		this.editor.RemoveView(this.openedFile)
		this.openedFile.Close()
		this.openedFile = nil

		SetViewGroup(this.editor, "")
	}

	if path := this.GetSources()[0].(*VfsListingWidget).GetSelectedPath(); strings.HasSuffix(path, ".go") {
		this.openedFile = NewFileView(path)

		this.openedFile.AddAndSetViewGroup(this.editor, readFileOrEmpty(path))

		if goPackage := this.GetSources()[1].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
			MakeUpdatedLock.Unlock() // HACK: Needed because UpdateVcs() calls MakeUpdated().
			goPackage.UpdateVcs()
			MakeUpdatedLock.Lock() // HACK
			if goPackage.Dir.Repo != nil {
				vcsLocalInvalidator := &VcsLocalInvalidator{Repo: goPackage.Dir.Repo}
				vcsLocalInvalidator.AddSources(&this.openedFile.FileContentChanged)
				keepUpdatedTEST = append(keepUpdatedTEST, vcsLocalInvalidator) // TODO: Clear old ones...
			}
		}
	}
}

// ---

type DepDumper struct {
	DepNode2
}

func (this *DepDumper) Update() {
	goon.Dump(this.GetSources()[0].(*VfsListingWidget).GetSelectedPath())
}

// ---

type SpinnerWidget struct {
	Widget
	Spinner uint32
	DepNode2
}

func (w *SpinnerWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Color3d(0, 0, 0)
	gl.Translated(w.pos[0], w.pos[1], 0)
	//gl.Rotated(float64(spinner), 0, 0, 1)
	gl.Rotated(float64(w.Spinner), 0, 0, 1)
	gl.Begin(gl.LINES)
	gl.Vertex2i(0, -10)
	gl.Vertex2i(0, 10)
	gl.End()
}

func (w *SpinnerWidget) Update() {
	//w.Spinner++
	w.Spinner += 45
}

// ---

type fpsSample struct{ Render, Total float64 }

type FpsWidget struct {
	Widget
	samples []fpsSample
}

func NewFpsWidget(pos mgl64.Vec2) *FpsWidget {
	return &FpsWidget{Widget: NewWidget(pos, mgl64.Vec2{30, 40})}
}

func (w *FpsWidget) Render() {
	gl.PushMatrix()
	defer gl.PopMatrix()
	gl.Translated(w.pos[0], w.pos[1]+w.size[1], 0)
	gl.Begin(gl.LINES)
	gl.Color3d(1, 0, 0)
	gl.Vertex2d(float64(0), float64(-1000.0/60))
	gl.Vertex2d(float64(30), float64(-1000.0/60))
	gl.End()
	for index, sample := range w.samples {
		var color mgl64.Vec3
		if sample.Render <= 1000.0/60*1.25 {
			color = mgl64.Vec3{0, 0, 0}
		} else {
			color = mgl64.Vec3{1, 0, 0}
		}
		DrawBorderlessBox(mgl64.Vec2{float64(30 - len(w.samples) + index), -sample.Render}, mgl64.Vec2{1, sample.Render}, color)
		DrawBorderlessBox(mgl64.Vec2{float64(30 - len(w.samples) + index), -sample.Total}, mgl64.Vec2{1, sample.Total - sample.Render}, mgl64.Vec3{0.65, 0.65, 0.65})
	}
}

func (w *FpsWidget) PushTimeToRender(sample float64) {
	w.samples = append(w.samples, fpsSample{Render: sample})
	if len(w.samples) > 30 {
		w.samples = w.samples[len(w.samples)-30:]
	}
}
func (w *FpsWidget) PushTimeTotal(sample float64) {
	w.samples[len(w.samples)-1].Total = sample
}

// ---

func WidgeterIndex(widgeters []Widgeter, w Widgeter) int {
	for index := range widgeters {
		if w == widgeters[index] {
			return index
		}
	}
	panic("WidgeterIndex: not found")
}

// ---

type SearchableListWidget struct {
	*CompositeWidget

	// Internal access shortcuts (also inside CompositeWidget).
	searchField          *TextBoxWidget
	listWidget           *FilterableSelecterWidget
	listWidgetScrollPane *ScrollPaneWidget

	ExtensionsTest []Widgeter
}

func NewSearchableListWidget(pos, size mgl64.Vec2, entries SliceStringer) *SearchableListWidget {
	searchField := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true})
	//listWidget := NewListWidget(mathgl.Vec2d{0, fontHeight + 2}, entries)
	listWidget := NewFilterableSelecterWidget(np, entries, searchField.Content, nil)
	listWidgetScrollPane := NewScrollPaneWidget(mgl64.Vec2{0, fontHeight + 2}, size, listWidget)

	w := &SearchableListWidget{CompositeWidget: NewCompositeWidget(pos, []Widgeter{searchField, listWidgetScrollPane}), searchField: searchField, listWidget: listWidget, listWidgetScrollPane: listWidgetScrollPane}

	return w
}

type entriesPlusOne struct {
	SliceStringer
	extra *TextBoxWidget
}

func (this *entriesPlusOne) Get(index uint64) fmt.Stringer {
	if index < this.SliceStringer.Len() {
		return this.SliceStringer.Get(index)
	} else {
		return json.Number("Create new \"" + this.extra.Content.Content() + "\"...") // HACK: Should use a better suited fmt.Stringer type.
	}
}

func (this *entriesPlusOne) Len() uint64 {
	return this.SliceStringer.Len() + 1
}

func NewSearchableListWidgetTest(pos, size mgl64.Vec2, entries SliceStringer) *SearchableListWidget {
	searchField := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true})
	listWidget := NewFilterableSelecterWidget(np, &entriesPlusOne{entries, searchField}, searchField.Content, nil)
	listWidgetScrollPane := NewScrollPaneWidget(mgl64.Vec2{0, fontHeight + 2}, size, listWidget)

	w := &SearchableListWidget{CompositeWidget: NewCompositeWidget(pos, []Widgeter{searchField, listWidgetScrollPane}), searchField: searchField, listWidget: listWidget, listWidgetScrollPane: listWidgetScrollPane}

	return w
}

func (w *SearchableListWidget) OnSelectionChanged() Selecter {
	return w.listWidget
}

// HACK/TEST: Mostly for external callers...
func (w *SearchableListWidget) SetKeyboardFocus() {
	// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
	// HACK: Temporarily set both widgets as mapping here
	keyboardPointer.OriginMapping = append([]Widgeter{w}, w.searchField, w.listWidget, w.listWidgetScrollPane)
}

func (w *SearchableListWidget) ProcessEvent(inputEvent InputEvent) {
	for _, extension := range w.ExtensionsTest {
		extension.ProcessEvent(inputEvent)
	}

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == false &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && // TODO: GetHoverer() // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { // TODO: GetHoverer() // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		w.SetKeyboardFocus()
	}
}

func (w *SearchableListWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		hits := []Widgeter{w}
		hits = append(hits, w.CompositeWidget.Hit(ParentPosition)...)
		return hits
	} else {
		return nil
	}
}

// ---

func NewSearchableListWidgetAction(pos, size mgl64.Vec2, entries SliceStringer) *SearchableListWidget {
	w := NewSearchableListWidget(pos, size, entries)

	actions := &CustomWidget{
		Widget: NewWidget(np, np),
		ProcessEventFunc: func(inputEvent InputEvent) {
			if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
				switch glfw.Key(inputEvent.InputId) {
				case glfw.KeyEnter:
					fmt.Println(w.listWidget.GetSelected())
				case glfw.KeyEscape:
					fmt.Println("Escape.")
				}
			}
		},
	}
	w.ExtensionsTest = append(w.ExtensionsTest, actions)

	return w
}

// ---

type FilterableSliceStringer struct {
	filteredEntries []fmt.Stringer

	DepNode2
}

func NewFilterableSliceStringer(source SliceStringer, filter caret.MultilineContentI) *FilterableSliceStringer {
	this := &FilterableSliceStringer{}
	this.AddSources(source, filter)
	return this
}

func (this *FilterableSliceStringer) Get(index uint64) fmt.Stringer {
	return this.filteredEntries[index]
}

func (this *FilterableSliceStringer) Len() uint64 {
	return uint64(len(this.filteredEntries))
}

func (this *FilterableSliceStringer) Update() {
	source := this.GetSources()[0].(SliceStringer)
	filter := this.GetSources()[1].(caret.MultilineContentI)

	filterLower := strings.ToLower(filter.Content())

	this.filteredEntries = nil
	for index := uint64(0); index < source.Len(); index++ {
		entry := source.Get(index).String()

		if filterLower != "" && !strings.Contains(strings.ToLower(entry), filterLower) { // TODO: Do case folding correctly
			continue
		}

		this.filteredEntries = append(this.filteredEntries, source.Get(index))
	}
}

// TODO: Need to output best fuzzy match rating, and sort by that.
// FuzzyMatch returns true if pattern fuzzy matches s. E.g., "fzy" pattern matches "fuzzy".
func FuzzyMatch(s, pattern string) bool {
	srs := []rune(s)
	for _, c := range pattern {
		var matchedC bool
		for i, sr := range srs {
			if c == sr {
				matchedC = true
				srs = srs[i+1:]
				break
			}
		}
		if !matchedC {
			return false
		}
	}
	return true
}

// TODO: Is this the right/best place?
func (this *FilterableSliceStringer) Print(filteredIndex uint64, pos mgl64.Vec2, selected bool) {
	entry := this.Get(filteredIndex).String()
	filter := this.GetSources()[1].(caret.MultilineContentI)

	index := strings.Index(strings.ToLower(entry), strings.ToLower(filter.Content()))

	glt := NewOpenGLStream(pos)
	if !selected {
		gl.Color3dv(&veryDarkColor[0])
		glt.PrintText(entry[:index])
		gl.Color3d(0, 0, 0)
		glt.FontOptions = Bold
		glt.PrintText(entry[index : index+len(filter.Content())])
		gl.Color3dv(&veryDarkColor[0])
		glt.FontOptions = Regular
		glt.PrintText(entry[index+len(filter.Content()):])
	} else {
		gl.Color3dv(&veryLightColor[0])
		glt.PrintText(entry[:index])
		gl.Color3d(1, 1, 1)
		glt.FontOptions = Bold
		glt.PrintText(entry[index : index+len(filter.Content())])
		gl.Color3dv(&veryLightColor[0])
		glt.FontOptions = Regular
		glt.PrintText(entry[index+len(filter.Content()):])
	}
}

// ---

type SliceStringer interface {
	Get(uint64) fmt.Stringer
	Len() uint64

	DepNode2I
}

type Selecter interface {
	GetSelected() fmt.Stringer

	DepNode2I
}

type FilterableSelecterWidget struct {
	Widget
	longestEntryLength   int
	selected             map[uint64]struct{} // index of selected entries [0, len)
	manuallyPicked       fmt.Stringer
	DepNode2Manual       // SelectionChanged
	SelectionChangedPost func()
	layoutDepNode2       DepNode2Func
	options              SelecterWidgetOptions

	entries *FilterableSliceStringer
}

type SelecterWidgetType uint8

const (
	SingleSelection SelecterWidgetType = iota
	OptionalSelection
)

type SelecterWidgetOptions struct {
	SelecterWidgetType
}

// NewSelecterWidget creates a simple selecter widget.
func NewSelecterWidget(pos mgl64.Vec2, entries SliceStringer, options *SelecterWidgetOptions) *FilterableSelecterWidget {
	return NewFilterableSelecterWidget(pos, entries, multilinecontent.New(), options)
}

// NewFilterableSelecterWidget creates a selecter widget with a filter.
//
// It only displays results that match the filter, if non-empty.
func NewFilterableSelecterWidget(pos mgl64.Vec2, entries SliceStringer, filter caret.MultilineContentI, options *SelecterWidgetOptions) *FilterableSelecterWidget {
	if options == nil {
		options = &SelecterWidgetOptions{}
	}

	filterableEntries := NewFilterableSliceStringer(entries, filter)
	filterableEntries.Update() // HACK: Try to do this, in case GetSelected() is called immediately, so it doesn't return nil despite there being a selected entry.

	w := &FilterableSelecterWidget{
		Widget:   NewWidget(pos, np),
		selected: make(map[uint64]struct{}),
		entries:  filterableEntries,
		options:  *options,
	}

	if w.options.SelecterWidgetType == SingleSelection {
		w.selected[0] = struct{}{} // Default selection.
	}

	w.layoutDepNode2.UpdateFunc = func(DepNode2I) { w.NotifyChange() }
	w.layoutDepNode2.AddSources(filterableEntries) // TODO: What about removing w when it's "deleted"?

	return w
}

func (this *FilterableSelecterWidget) GetSelected() fmt.Stringer {
	for s := range this.selected {
		if s < this.entries.Len() {
			return this.entries.Get(s)
		}
	}
	return nil
}

func (w *FilterableSelecterWidget) NotifyChange() {
	var selectionPreserved = false

	w.longestEntryLength = 0
	for index := uint64(0); index < w.entries.Len(); index++ {
		entry := w.entries.Get(index).String()
		entryLength := len(entry)
		if entryLength > w.longestEntryLength {
			w.longestEntryLength = entryLength
		}

		// Preserve selection
		if w.entries.Get(index) == w.manuallyPicked {
			w.selected = map[uint64]struct{}{index: {}}
			selectionPreserved = true
		}
	}

	if len(w.selected) > 0 && !selectionPreserved {
		w.selected = map[uint64]struct{}{0: {}}
		if w.entries.Len() > 0 {
			// HACK, TODO: This should happen not when the selection is unpreserved, but when it is unchanged
			// (i.e. it may be unpreserved, but still equal, then no need to report a change)
			w.selectionChangedTest() // TEST, HACK: This sets manuallyPicked because it's meant for user-driven actions, etc. Need to do this in a better way.
		}
		w.manuallyPicked = nil
	}

	w.Layout()

	w.NotifyAllListeners()
}

// Pre-condition: w.entries.Len() > 0
func (w *FilterableSelecterWidget) selectionChangedTest() {
	var firstSelected uint64
	for s := range w.selected {
		firstSelected = s
		break
	}

	// TEST
	if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
		scrollPane.ScrollToArea(mgl64.Vec2{0, float64(firstSelected * fontHeight)}, mgl64.Vec2{float64(w.longestEntryLength * fontWidth), fontHeight})
	}

	w.manuallyPicked = w.entries.Get(firstSelected)

	if w.SelectionChangedPost != nil {
		w.SelectionChangedPost()
	}
	ExternallyUpdated(w)
}

func (w *FilterableSelecterWidget) Layout() {
	if w.longestEntryLength < 3 {
		w.size[0] = float64(fontWidth * 3)
	} else {
		w.size[0] = float64(fontWidth * w.longestEntryLength)
	}
	if w.entries.Len() == 0 {
		w.size[1] = float64(fontHeight * 1)
	} else {
		w.size[1] = float64(fontHeight * w.entries.Len())
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *FilterableSelecterWidget) LayoutNeeded() {
	MakeUpdated(&w.layoutDepNode2)
}

func (w *FilterableSelecterWidget) Render() {
	DrawNBox(w.pos, w.size)

	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer
	hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	// Render only visible lines.
	// TODO: Generalize this.
	const debugSmallerViewport = fontHeight
	beginLineIndex, endLineIndex := 0, int(w.entries.Len())
	if beginVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, debugSmallerViewport})[1] / fontHeight); beginVisibleLineIndex > beginLineIndex {
		beginLineIndex = intmath.MinInt(beginVisibleLineIndex, endLineIndex)
	}
	_, height := globalWindow.GetSize() // HACK: Should be some viewport
	height -= debugSmallerViewport
	if endVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, float64(height)})[1]/fontHeight + 1); endVisibleLineIndex < endLineIndex {
		endLineIndex = intmath.MaxInt(endVisibleLineIndex, beginLineIndex)
	}

	for ; beginLineIndex < endLineIndex; beginLineIndex++ {
		if _, ok := w.selected[uint64(beginLineIndex)]; ok {
			if hasTypingFocus {
				DrawBorderlessBox(w.pos.Add(mgl64.Vec2{0, float64(beginLineIndex * fontHeight)}), mgl64.Vec2{w.size[0], fontHeight}, selectedEntryColor)

				w.entries.Print(uint64(beginLineIndex), w.pos.Add(mgl64.Vec2{0, float64(beginLineIndex * fontHeight)}), true)
			} else {
				DrawBorderlessBox(w.pos.Add(mgl64.Vec2{0, float64(beginLineIndex * fontHeight)}), mgl64.Vec2{w.size[0], fontHeight}, selectedEntryInactiveColor)

				w.entries.Print(uint64(beginLineIndex), w.pos.Add(mgl64.Vec2{0, float64(beginLineIndex * fontHeight)}), false)
			}
		} else {
			w.entries.Print(uint64(beginLineIndex), w.pos.Add(mgl64.Vec2{0, float64(beginLineIndex * fontHeight)}), false)
		}
	}
}

func (w *FilterableSelecterWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}
}
func (w *FilterableSelecterWidget) ProcessEvent(inputEvent InputEvent) {
	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		if !keyboardPointer.OriginMapping.ContainsWidget(w) {
			keyboardPointer.OriginMapping = []Widgeter{w}
		}
	}

	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer
	hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	if hasTypingFocus && inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.Pointer.State.Button(0) {
		globalPosition := mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]}
		localPosition := WidgeterS{w}.GlobalToLocal(globalPosition)
		if w.entries.Len() > 0 {
			var newSelected uint64
			if localPosition[1] < 0 {
				newSelected = 0
			} else if uint64(localPosition[1]/fontHeight) > w.entries.Len()-1 {
				newSelected = w.entries.Len() - 1
			} else {
				newSelected = uint64(localPosition[1] / fontHeight)
			}
			if _, ok := w.selected[newSelected]; !ok {
				w.selected = map[uint64]struct{}{newSelected: {}}
				w.selectionChangedTest()
			}
		}
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		var firstSelected uint64
		for s := range w.selected {
			firstSelected = s
			break
		}

		switch glfw.Key(inputEvent.InputId) {
		case glfw.KeyUp:
			if inputEvent.ModifierKey == glfw.ModSuper {
				if w.entries.Len() > 0 && firstSelected > 0 {
					w.selected = map[uint64]struct{}{0: {}}
					w.selectionChangedTest()
				}
			} else if inputEvent.ModifierKey == 0 {
				if w.entries.Len() > 0 && firstSelected > 0 {
					w.selected = map[uint64]struct{}{firstSelected - 1: {}}
					w.selectionChangedTest()
				}
			}
		case glfw.KeyDown:
			if inputEvent.ModifierKey == glfw.ModSuper {
				if w.entries.Len() > 0 && firstSelected < w.entries.Len()-1 {
					w.selected = map[uint64]struct{}{w.entries.Len() - 1: {}}
					w.selectionChangedTest()
				}
			} else if inputEvent.ModifierKey == 0 {
				if w.entries.Len() > 0 && firstSelected < w.entries.Len()-1 {
					w.selected = map[uint64]struct{}{firstSelected + 1: {}}
					w.selectionChangedTest()
				}
			}
		}
	}
}

// ---

// TODO: Remove this, it's been superseded by more general NewGoPackageListingWidget().
// TODO: Take its "background streaming" functionality before removing.
/*func NewGoPackageListingPureWidget() *GoPackageListingPureWidget {
	w := &GoPackageListingPureWidget{Widget: NewWidget(np, np), goPackages: make(chan ImportPathFound, 64)}

	go gist8018045.GetGoPackages(w.goPackages)
	UniversalClock.AddChangeListener(w)

	return w
}

func (w *GoPackageListingPureWidget) NotifyChange() {
	// TODO: Support for preserving selection

	for {
		select {
		case entry, ok := <-w.goPackages:
			if ok {
				w.entries = append(w.entries, entry)

				entryLength := len(entry.ImportPath())
				if entryLength > w.longestEntryLength {
					w.longestEntryLength = entryLength
				}

				redraw = true

				w.Layout()
			} else {
				return
			}
		default:
			return
		}
	}
}*/

// ---

type VfsListingWidget struct {
	vfs vfs.FileSystem
	*CompositeWidget
	flow *FlowLayoutWidget // HACK: Shortcut to CompositeWidget.Widgets[0]

	ExtensionsTest []Widgeter

	DepNode2Manual // SelectionChanged
}

func NewVfsListingWidget(pos mgl64.Vec2, vfs vfs.FileSystem, path string) *VfsListingWidget {
	w := &VfsListingWidget{vfs: vfs, CompositeWidget: NewCompositeWidget(pos, []Widgeter{NewFlowLayoutWidget(np, []Widgeter{newVfsListingPureWidget(vfs, path)}, nil)})}
	w.flow = w.Widgets[0].(*FlowLayoutWidget)
	w.flow.SetParent(w) // HACK?
	return w
}

// TODO: Use a custom path type instead of a string?
func (w *VfsListingWidget) GetSelectedPath() (selectedPath string) {
	for _, widget := range w.flow.Widgets {
		if pure := widget.(*VfsListingPureWidget); pure.GetSelected() != nil {
			fis := pure.GetSelected().(FileInfoStringer)
			selectedPath = path.Join(pure.path, fis.Name())
			if fis.IsDir() {
				selectedPath += string(PathSeparator)
			}
		}
	}
	return selectedPath
}

func (w *VfsListingWidget) SetKeyboardFocus() {
	c := w.flow.Widgets[len(w.flow.Widgets)-1]

	// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
	keyboardPointer.OriginMapping = []Widgeter{c, w}
}

func (w *VfsListingWidget) ProcessEvent(inputEvent InputEvent) {
	for _, extension := range w.ExtensionsTest {
		extension.ProcessEvent(inputEvent)
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		switch glfw.Key(inputEvent.InputId) {
		case glfw.KeyLeft:
			c := keyboardPointer.OriginMapping[0] // HACK
			index := WidgeterIndex(w.flow.Widgets, c)

			if index > 0 {
				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				// HACK: Temporarily set both this and parent as mapping here
				c = w.flow.Widgets[index-1]
				keyboardPointer.OriginMapping = []Widgeter{c, w}
				if cp, ok := c.(*VfsListingPureWidget); ok {
					// TODO: Optimize so it doesn't refresh just because you navigated to parent folder?
					cp.selectionChangedTest()
				}
			}
		case glfw.KeyRight:
			c := keyboardPointer.OriginMapping[0] // HACK
			index := WidgeterIndex(w.flow.Widgets, c)

			if index != -1 && index+1 < len(w.flow.Widgets) {
				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				// HACK: Temporarily set both this and parent as mapping here
				c = w.flow.Widgets[index+1]
				keyboardPointer.OriginMapping = []Widgeter{c, w}
				if cp, ok := c.(*VfsListingPureWidget); ok && cp.GetSelected() == nil && cp.entries.Len() > 0 {
					cp.selected = map[uint64]struct{}{0: {}}
					cp.selectionChangedTest()
				}
			}
		}
	}
}

// ---

const PathSeparator = "/"

type FileInfoStringer struct {
	os.FileInfo
}

func (fi FileInfoStringer) String() string {
	if fi.IsDir() {
		return fi.Name() + PathSeparator
	} else {
		return fi.Name()
	}
}

type VfsListingPureWidget struct {
	*FilterableSelecterWidget
	vfs  vfs.FileSystem
	path string
}

func newVfsListingPureWidget(vfs vfs.FileSystem, path string) Widgeter {
	entries, err := vfs.ReadDir(path)
	if err != nil {
		panic(err)
	}

	ss := &SliceStringerS{}
	for _, v := range entries {
		if strings.HasPrefix(v.Name(), ".") {
			continue
		}
		ss.entries = append(ss.entries, FileInfoStringer{FileInfo: v})
	}

	w := &VfsListingPureWidget{
		FilterableSelecterWidget: NewSelecterWidget(np, ss, &SelecterWidgetOptions{SelecterWidgetType: OptionalSelection}),
		vfs:                      vfs,
		path:                     path,
	}
	w.FilterableSelecterWidget.SelectionChangedPost = func() { w.selectionChangedTest() }

	return w
}

// TEST
func newVfsListingPureWidgetWithSelection(vfs vfs.FileSystem, path string) Widgeter {
	entries, err := vfs.ReadDir(path)
	if err != nil {
		panic(err)
	}

	ss := &SliceStringerS{}
	for _, v := range entries {
		if strings.HasPrefix(v.Name(), ".") {
			continue
		}
		ss.entries = append(ss.entries, FileInfoStringer{FileInfo: v})
	}

	w := &VfsListingPureWidget{
		FilterableSelecterWidget: NewSelecterWidget(np, ss, &SelecterWidgetOptions{SelecterWidgetType: SingleSelection}),
		vfs:                      vfs,
		path:                     path,
	}
	w.FilterableSelecterWidget.SelectionChangedPost = func() { w.selectionChangedTest() }

	return w
}

/*func newVfsListing0PureWidget(vfs vfs.FileSystem, path string) *VfsListingPureWidget {
	w := &VfsListingPureWidget{vfs: vfs, Widget: NewWidget(np, np), path: path}
	w.NotifyChange() // TODO: Give it a proper source
	return w
}*/

func (w *VfsListingPureWidget) selectionChangedTest() {
	if w.GetSelected() != nil && w.GetSelected().(FileInfoStringer).IsDir() {
		path := path.Join(w.path, w.GetSelected().(FileInfoStringer).Name())
		var newFolder Widgeter

		/*if bpkg, err := gist5504644.BuildPackageFromSrcDir(path); err == nil {
			dpkg := gist5504644.GetDocPackage(bpkg, err)

			out := underline(`import "`+dpkg.ImportPath+`"`) + "\n"
			for _, v := range dpkg.Vars {
				out += printerutil.SprintAstBare(v.Decl) + "\n"
			}
			out += "\n"
			for _, f := range dpkg.Funcs {
				out += printerutil.SprintAstBare(f.Decl) + "\n"
			}
			out += "\n"
			for _, c := range dpkg.Consts {
				out += printerutil.SprintAstBare(c.Decl) + "\n"
			}
			out += "\n"
			for _, t := range dpkg.Types {
				out += fmt.Sprint(t.Name) + "\n"
				//printerutil.PrintlnAstBare(t.Decl)
			}

			newFolder = NewTextLabelWidgetString(np, out)
		} else if isGitRepo, status := IsFolderGitRepo(path); isGitRepo {
			newFolder = NewTextLabelWidgetString(np, status)
		} else */{
			newFolder = newVfsListingPureWidget(w.vfs, path)
		}

		p := w.Parent().(*FlowLayoutWidget)
		index := WidgeterIndex(p.Widgets, w)
		p.SetWidgets(append(p.Widgets[:index+1], newFolder))
	} else {
		p := w.Parent().(*FlowLayoutWidget)
		index := WidgeterIndex(p.Widgets, w)
		p.SetWidgets(p.Widgets[:index+1])
	}

	ExternallyUpdated(w.Parent().Parent().(DepNode2ManualI)) // VfsListingWidget.SelectionChanged.
}

func (w *VfsListingPureWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if len(w.FilterableSelecterWidget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w, w.FilterableSelecterWidget}
	} else {
		return nil
	}
}
func (w *VfsListingPureWidget) ProcessEvent(inputEvent InputEvent) {
	w.FilterableSelecterWidget.ProcessEvent(inputEvent)

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == false &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		// HACK: Temporarily set both this and parent as mapping here
		p := w.Parent().Parent().(*VfsListingWidget)
		keyboardPointer.OriginMapping = []Widgeter{w, p}
	}
}
func (w *VfsListingPureWidget) ContainsWidget(widget, target Widgeter) bool {
	return widget == target || w.FilterableSelecterWidget == target
}

// ---

type onlyGoFiles struct {
	vfs.FileSystem
}

func (fs onlyGoFiles) ReadDir(path string) ([]os.FileInfo, error) {
	fis, err := fs.FileSystem.ReadDir(path)
	var filtered []os.FileInfo
	for _, v := range fis {
		if !strings.HasPrefix(v.Name(), ".") && strings.HasSuffix(v.Name(), ".go") && !v.IsDir() {
			filtered = append(filtered, v)
		}
	}
	return filtered, err
}

// ---

type GoonWidget struct {
	*CompositeWidget
	title    string
	a        reflect.Value
	expanded *TriButtonWidget
}

func NewGoonWidget(pos mgl64.Vec2, a interface{}) Widgeter {
	title := reflectsource.GetParentArgExprAsString(1)
	if !strings.HasPrefix(title, "&") {
		log.Println("NewGoonWidget: Need to pass address of value.")
		title = "&<unknown>"
	}
	//goonWidget := newGoonWidget(mathgl.Vec2d{fontHeight + 2}, title[1:], reflect.ValueOf(a))
	goonWidget := setupInternals3(mgl64.Vec2{fontHeight + 2}, title[1:], bypass.UnsafeReflectValue(reflect.ValueOf(a)).Elem())
	return NewCompositeWidget(pos, []Widgeter{goonWidget})
}

func newGoonWidget(pos mgl64.Vec2, title string, a reflect.Value) *GoonWidget {
	/*expanded := &Bool{}

	action := func() {
		expanded.Toggle()
	}
	b := NewButtonWidget(mathgl.Vec2d{}, action)

	contentFunc := func() string {
		if expanded.Get() {
			return goon.Sdump(a)
		} else {
			return fmt.Sprintf("(%T)(%v)", a, a)
		}
	}
	dependees := []DepNodeI{expanded}
	mc := NewMultilineContentFunc(contentFunc, dependees)
	mc.NotifyChange()
	t := NewTextLabelWidgetExternalContent(mathgl.Vec2d{16 + 2}, mc)

	return &GoonWidget{CompositeWidget: NewCompositeWidget(pos, []Widgeter{b, t}), a: a}*/

	a = bypass.UnsafeReflectValue(a)

	w := &GoonWidget{CompositeWidget: NewCompositeWidget(pos, nil), title: title, a: a}
	w.setupInternals()
	return w
}

func (w *GoonWidget) flip() {
	w.setupInternals()
}
func (w *GoonWidget) setupInternals() {
	expandable := w.checkInternals()
	oldParent := w.parent
	if expandable {
		if w.expanded == nil {
			w.expanded = NewTriButtonWidget(mgl64.Vec2{-fontHeight - 2}, func() { w.flip() })
		}

		w.CompositeWidget = NewCompositeWidget(w.pos, []Widgeter{w.expanded, &Widget{}})
	} else {
		w.CompositeWidget = NewCompositeWidget(w.pos, []Widgeter{&Widget{}})
	}
	w.SetParent(oldParent)

	var f *FlowLayoutWidget
	if w.expanded == nil || !w.expanded.State() {
		title := NewTextLabelWidgetString(np, w.title+": ")

		var mc caret.MultilineContentI
		if !expandable {
			// TODO: Strings need %#v, numbers need %+v
			mc = NewMultilineContentFuncInstant(func() string { return fmt.Sprintf("(%s)(%+v)", getTypeString(w.a.Elem()), w.a.Elem().Interface()) })
		} else {
			mc = multilinecontent.NewString(fmt.Sprintf("%s{...}", getTypeString(w.a.Elem())))
		}
		t := NewTextLabelWidgetExternalContent(np, mc)
		f = NewFlowLayoutWidget(np, []Widgeter{title, t}, nil)
	} else {
		f = w.setupInternals2(w.a)
	}
	f.SetParent(w) // HACK: This needs to be automated, it's too easy to forget to do
	w.Widgets[len(w.Widgets)-1] = f
	f.Layout()
}

func (w *GoonWidget) checkInternals() (depth bool) {
	v := w.a.Elem()

	switch v.Kind() {
	case reflect.Struct, reflect.Map, reflect.Array, reflect.Slice, reflect.Interface:
		return true
	case reflect.Ptr: //reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Slice
		return !v.IsNil()
	default:
		return false
	}
}

func getTypeString(a reflect.Value) string {
	// TODO: Do this properly
	//return fmt.Sprintf("%T/%s/%s", a.Interface(), a.Type().Name(), a.Type().String())
	return a.Type().String() // Let's see how this works out...
}

func (w *GoonWidget) setupInternals2(a reflect.Value) (f *FlowLayoutWidget) {
	v := a.Elem()

	title := NewTextLabelWidgetString(np, w.title+": ")
	t := NewTextLabelWidgetString(np, fmt.Sprintf("%s{", getTypeString(v)))
	header := NewFlowLayoutWidget(np, []Widgeter{title, t}, nil)
	tab := mgl64.Vec2{fontHeight + 2}

	widgets := []Widgeter{header}

	switch v.Kind() {
	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
		// TODO: Instead of skipping nil values, maybe pass the info as a bool parameter to query?
		if v.IsNil() {
			widgets = append(widgets, NewTextLabelWidgetString(np, "}"))

			return NewFlowLayoutWidget(np, widgets, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout})
		}
	}

	// Follow pointer
	switch v.Kind() {
	case reflect.Ptr, reflect.Interface:
		v = v.Elem()
	}

	switch v.Kind() {
	case reflect.Struct:
		vt := v.Type()
		for i := 0; i < v.NumField(); i++ {
			widgets = append(widgets, setupInternals3(tab, vt.Field(i).Name, v.Field(i)))
		}
	case reflect.Map:
		for _, key := range v.MapKeys() {
			addrValue := bypass.UnsafeReflectValue(v.MapIndex(key))
			widgets = append(widgets, setupInternals3(tab, key.String(), addrValue))
		}
	case reflect.Array, reflect.Slice:
		for i := 0; i < v.Len(); i++ {
			widgets = append(widgets, setupInternals3(tab, strconv.Itoa(i), v.Index(i)))
		}
	case reflect.Ptr, reflect.Interface:
		widgets = append(widgets, setupInternals3(tab, "*", v.Elem()))
	}

	widgets = append(widgets, NewTextLabelWidgetString(np, "}"))

	return NewFlowLayoutWidget(np, widgets, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout})
}

func setupInternals3(pos mgl64.Vec2, titleString string, a reflect.Value) Widgeter {
	/*if !a.CanInterface() {
		a = bypass.UnsafeReflectValue(a)
	}*/

	var w Widgeter
	if a.Kind() == reflect.Float64 && a.Addr().CanInterface() {
		title := NewTextLabelWidgetString(np, titleString+": ")
		t := NewTest2Widget(np, a.Addr().Interface().(*float64))
		w = NewFlowLayoutWidget(pos, []Widgeter{title, t}, nil)
	} else if a.Kind() == reflect.String && a.Addr().CanInterface() {
		title := NewTextLabelWidgetString(np, titleString+": ")
		t := NewTextBoxWidgetExternalContent(np, NewMultilineContentPointer(a.Addr().Interface().(*string)), nil)
		w = NewFlowLayoutWidget(pos, []Widgeter{title, t}, nil)
	} else if a.Kind() == reflect.Bool && a.Addr().CanInterface() {
		title := NewTextLabelWidgetString(np, titleString+": ")
		t := NewTriButtonExternalStateWidget(np, func() bool { return *a.Addr().Interface().(*bool) }, func() { *a.Addr().Interface().(*bool) = !*a.Addr().Interface().(*bool) })
		t2 := NewTextLabelWidgetExternalContent(np, NewMultilineContentFuncInstant(func() string { return fmt.Sprint(*a.Addr().Interface().(*bool)) }))
		w = NewFlowLayoutWidget(pos, []Widgeter{title, t, t2}, nil)
	} else if vv := a; vv.CanAddr() {
		w = newGoonWidget(pos, titleString, vv.Addr())
	} else if vv := a; (vv.Kind() == reflect.Interface || vv.Kind() == reflect.Ptr) && vv.Elem().CanAddr() { // HACK
		w = newGoonWidget(pos, titleString, vv.Elem().Addr())
	} else {
		//w = NewTextLabelWidgetString(pos, goon.Sdump(vv))
		w = NewTextLabelWidgetString(pos, fmt.Sprintf("(%s)(can't addr... %s)", vv.Kind().String(), vv.String()))
	}

	spacer := NewCompositeWidget(np, []Widgeter{w})
	return spacer
}

// ---

func NewContentReader(c caret.MultilineContentI) io.Reader { return strings.NewReader(c.Content()) }

// ---

type MultilineContentFile struct {
	*multilinecontent.MultilineContent // TODO: Explore this being a pointer vs value
	path                               string
	ViewGroup
}

func NewMultilineContentFile(path string) *MultilineContentFile {
	this := &MultilineContentFile{MultilineContent: multilinecontent.New(), path: path}
	absPath, err := filepath.Abs(path)
	if err != nil {
		panic(err)
	}
	this.InitViewGroup(this, FileUri("file://"+absPath))
	this.AddAndSetViewGroup(this.MultilineContent, readFileOrEmpty(this.path))
	UniversalClock.AddChangeListener(this)
	return this
}

func (this *MultilineContentFile) SetSelf(content string) {
	err := ioutil.WriteFile(this.path, []byte(content), 0644)
	if err != nil {
		log.Println(err)
	}
}

func (this *MultilineContentFile) NotifyChange() {
	// Check if the file has been changed externally, and if so, override this widget
	NewContent := readFileOrEmpty(this.path)
	if NewContent != this.Content() {
		SetViewGroupOther(this, NewContent)
		redraw = true
	}
}

func (this *MultilineContentFile) Path() string {
	return this.path
}

// ---

type FileView struct {
	path string
	ViewGroup

	FileContentChanged DepNode2Manual // File content changed.

	lastContentQUICKHACK string // HACK: Need this here for `git diff` testing
}

// TODO: Opening same path should result in same FileView, etc.
func NewFileView(path string) *FileView {
	this := &FileView{path: path}

	absPath, err := filepath.Abs(path)
	if err != nil {
		panic(err)
	}

	this.lastContentQUICKHACK = readFileOrEmpty(this.path)

	this.InitViewGroup(this, FileUri("file://"+absPath))
	UniversalClock.AddChangeListener(this) // TODO: Closing, etc.

	return this
}

// TODO, THINK: Should I be closing, or "stop keeping updating"? Or is it the same thing...
func (this *FileView) Close() error {
	UniversalClock.RemoveChangeListener(this)
	return nil
}

func (this *FileView) SetSelf(content string) {
	err := ioutil.WriteFile(this.path, []byte(content), 0644)
	if err != nil {
		log.Println(err)
	}
	this.lastContentQUICKHACK = content
	ExternallyUpdated(&this.FileContentChanged) // File content changed.
}

// TODO: Change detection, closing, etc.
func (this *FileView) NotifyChange() {
	// Check if the file has been changed externally, and if so, override this widget
	NewContent := readFileOrEmpty(this.path)
	if NewContent != this.lastContentQUICKHACK {
		this.lastContentQUICKHACK = NewContent
		SetViewGroupOther(this, NewContent)
		ExternallyUpdated(&this.FileContentChanged) // File content changed.
		redraw = true
	}
}

// ---

type MultilineContentPointer struct {
	*multilinecontent.MultilineContent
	p *string
	ViewGroup
}

func NewMultilineContentPointer(p *string) *MultilineContentPointer {
	this := &MultilineContentPointer{MultilineContent: multilinecontent.New(), p: p}
	this.InitViewGroup(this, "memory://???")
	this.AddAndSetViewGroup(this.MultilineContent, *p)
	UniversalClock.AddChangeListener(this) // TODO: Perhaps switch to a push notifications type setup, instead of constantly polling for change...
	return this
}

func (this *MultilineContentPointer) SetSelf(content string) {
	*this.p = content
}

func (this *MultilineContentPointer) NotifyChange() {
	// Check if the pointer value has been changed externally, and if so, override this widget
	NewContent := *this.p
	if NewContent != this.Content() {
		SetViewGroupOther(this, NewContent)
	}
}

// ---

type WebSocketView struct {
	c          *websocket.Conn
	WsReadChan chan string
	ViewGroup
}

func NewWebSocketView(c *websocket.Conn) *WebSocketView {
	this := &WebSocketView{c: c, WsReadChan: make(chan string)}
	this.InitViewGroup(this, FileUri(c.LocalAddr().String()))
	UniversalClock.AddChangeListener(this)
	return this
}

func (this *WebSocketView) SetSelf(content string) {
	// TODO: In case of multipart sends, follow with a null separator, have JS parse it out and reassemble parts
	io.WriteString(this.c, content)
}

func (this *WebSocketView) NotifyChange() {
	select {
	case NewContent, ok := <-this.WsReadChan:
		if ok {
			//if NewContent != this.Content() {
			SetViewGroupOther(this, NewContent)
			//}
		}
	default:
	}
}

// ---

type lifeFormWidget struct {
	Widget

	Color uint8

	/*struct State
	{
		sint32				Health		= 100;		// [0, 200]
		sint32				Pain		= 0;		// [0, 100]
		sint32				Energy		= 1000;		// [0, 2000]
	};

	struct Output
	{
		sint32				Action		= -1;		// [-1, 8], move direction, where -1 means stop
	};

	Vector2d				m_PositionD;
	Vector2d				m_VelocityD;

	State					m_CurrentState;

	Output GenerateOutput();*/
}

func NewLifeFormWidget(pos mgl64.Vec2) *lifeFormWidget {
	w := &lifeFormWidget{Widget: NewWidget(pos, mgl64.Vec2{100, 100})}
	UniversalClock.AddChangeListener(w)
	return w
}

func (w *lifeFormWidget) Render() {
	Colors := []mgl64.Vec3{
		{0 / 255.0, 140 / 255.0, 0 / 255.0},
		{0 / 255.0, 98 / 255.0, 140 / 255.0},
		{194 / 255.0, 74 / 255.0, 0 / 255.0},
		{89 / 255.0, 0 / 255.0, 140 / 255.0},
		{191 / 255.0, 150 / 255.0, 0 / 255.0},
		{140 / 255.0, 0 / 255.0, 0 / 255.0},
	}

	DrawCircle(w.pos, w.size, mgl64.Vec3{0.3, 0.3, 0.3}, Colors[w.Color])

	// Render properties
	/*OpenGLStream OpenGLStream(GetPosition() + Vector2n(GetDimensions().X() / 2 + 5, GetDimensions().X() / -2));
	std::stringstream ss;
	ss << "Health: " << m_CurrentState.Health << '\n';
	ss << "Pain: " << m_CurrentState.Pain << '\n';
	ss << "Energy: " << m_CurrentState.Energy;
	OpenGLStream << ss.str();*/
}

func (w *lifeFormWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	if w.pos.Sub(ParentPosition).Len() <= w.size[0]/2 {
		return []Widgeter{w}
	} else {
		return nil
	}
}

func (w *lifeFormWidget) NotifyChange() {
	var timePassed float64 = UniversalClock.TimePassed

	m_PositionD := w.pos
	var m_VelocityD mgl64.Vec2

	// Instinct model
	{
		m_VelocityD = mgl64.Vec2{8, 5}

		const speedMultiplier = float64(250)

		ParentPosition := WidgeterS{w}.GlobalToParent(mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]})
		LocalPosition := w.ParentToLocal(ParentPosition)

		if true && //PointerState.GetButtonState(0)
			len(w.Hit(ParentPosition)) > 0 {

			EscapeVector := LocalPosition
			EscapeAngle := math.Atan2(EscapeVector[0], EscapeVector[1])
			EscapeDirection := mgl64.Vec2{math.Sin(EscapeAngle), math.Cos(EscapeAngle)}.Mul(-1)

			m_VelocityD = EscapeDirection.Mul(speedMultiplier)
		}
	}

	// Thinking model
	/*{
		const auto QuarterPi = std::atan(1);

		auto Output = GenerateOutput();

		m_VelocityD = Vector2d(0, 0);

		if (   Output.Action >= 0
			&& Output.Action <  8)
		{
			m_VelocityD = Vector2d(std::cos(QuarterPi * Output.Action), std::sin(QuarterPi * Output.Action)) * 10;
		}
	}*/

	// Simulation
	{
		m_PositionD = m_PositionD.Add(m_VelocityD.Mul(timePassed))

		w.pos = m_PositionD
		redraw = true
	}
}

// ---

type MultilineContentFunc struct {
	*multilinecontent.MultilineContent // TODO: Explore this being a pointer vs value
	contentFunc                        func() string
	ViewGroup
}

// THINK: Merge the func and dependees into one struct? Maybe can't if funcs can have different signatures...
func NewMultilineContentFunc(contentFunc func() string, dependees []DepNodeI) *MultilineContentFunc {
	this := &MultilineContentFunc{MultilineContent: multilinecontent.New(), contentFunc: contentFunc}
	this.InitViewGroup(this, "func://???")
	this.AddAndSetViewGroup(this.MultilineContent, contentFunc())
	for _, dependee := range dependees {
		dependee.AddChangeListener(this)
	}
	return this
}

func (*MultilineContentFunc) SetSelf(string) {
	// TODO: Figure out if it's okay to effectively ignore this... or should I prevent it from being possible to call Set()?
	// Do nothing because the content of MultilineContentFunc can't be set as a string
}

func (this *MultilineContentFunc) NotifyChange() {
	NewContent := this.contentFunc()
	if NewContent != this.Content() {
		SetViewGroupOther(this, NewContent)
	}
}

// ---

// TODO: Finish implementation.
type MultilineContentFunc2 struct {
}

func NewMultilineContentFunc2(contentFunc DepStringerI) *MultilineContentFunc2 {
	this := &MultilineContentFunc2{}
	return this
}

// ---

type MultilineContentFuncInstant struct {
	*MultilineContentFunc
}

func NewMultilineContentFuncInstant(contentFunc func() string) *MultilineContentFuncInstant {
	return &MultilineContentFuncInstant{MultilineContentFunc: NewMultilineContentFunc(contentFunc, nil)}
}

// HACK: Because a func that calls Content(), Lines(), LongestLine() in some arbitrary order will get potentitally inconsistent results
func (this *MultilineContentFuncInstant) Content() string {
	this.MultilineContentFunc.NotifyChange()
	return this.MultilineContentFunc.Content()
}
func (this *MultilineContentFuncInstant) LongestLine() uint32 {
	this.MultilineContentFunc.NotifyChange()
	return this.MultilineContentFunc.LongestLine()
}
func (this *MultilineContentFuncInstant) LenContent() int {
	this.MultilineContentFunc.NotifyChange()
	return this.MultilineContentFunc.LenContent()
}
func (this *MultilineContentFuncInstant) Line(lineIndex int) caret.ContentLine {
	this.MultilineContentFunc.NotifyChange()
	return this.MultilineContentFunc.Line(lineIndex)
}

// ---

type TextLabelWidget struct {
	Widget
	Content        caret.MultilineContentI
	tooltip        Widgeter
	layoutDepNode2 DepNode2Func
}

func NewTextLabelWidgetExternalContent(pos mgl64.Vec2, mc caret.MultilineContentI) *TextLabelWidget {
	w := &TextLabelWidget{
		Widget:  NewWidget(pos, mgl64.Vec2{0, 0}),
		Content: mc,
	}
	w.layoutDepNode2.UpdateFunc = func(DepNode2I) { w.NotifyChange() }
	w.layoutDepNode2.AddSources(mc) // TODO: What about removing w when it's "deleted"?
	keepUpdatedTEST = append(keepUpdatedTEST, &w.layoutDepNode2)
	return w
}

func NewTextLabelWidgetString(pos mgl64.Vec2, s string) *TextLabelWidget {
	mc := multilinecontent.NewString(s)
	w := NewTextLabelWidgetExternalContent(pos, mc)
	return w
}

func NewTextLabelWidgetGoon(pos mgl64.Vec2, any interface{}) *TextLabelWidget {
	mc := NewMultilineContentFuncInstant(func() string { return strings.TrimSuffix(goon.Sdump(any), "\n") })
	return NewTextLabelWidgetExternalContent(pos, mc)
}

func NewTextLabelWidgetStringTooltip(pos mgl64.Vec2, s, tooltip string) *TextLabelWidget {
	mc := multilinecontent.NewString(s)
	w := NewTextLabelWidgetExternalContent(pos, mc)
	w.tooltip = NewTextLabelWidgetString(np, tooltip)
	return w
}

func (w *TextLabelWidget) NotifyChange() {
	w.Layout()

	w.NotifyAllListeners()

	// TODO: Figure out if this should be here... is it a big deal if it gets called here AND elsewhere?
	redraw = true
}

func (w *TextLabelWidget) Layout() {
	if w.Content.LongestLine() < 3 {
		w.size[0] = float64(fontWidth * 3)
	} else {
		w.size[0] = float64(fontWidth * w.Content.LongestLine())
	}
	w.size[1] = float64(fontHeight * w.Content.LenLines())

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *TextLabelWidget) Render() {
	DrawLGBox(w.pos, w.size)
	//DrawBorderlessBox(w.pos, w.size, lightColor)

	gl.Color3d(0, 0, 0)
	NewOpenGLStream(w.pos).PrintText(w.Content.Content())

	isHit := len(w.HoverPointers()) > 0
	// Tooltip
	if w.tooltip != nil && isHit {
		mousePointerPositionLocal := WidgeterS{w}.GlobalToLocal(mgl64.Vec2{mousePointer.State.Axes[0], mousePointer.State.Axes[1]})
		w.tooltip.Layout()
		tooltipOffset := mgl64.Vec2{0, -fontHeight - w.tooltip.Size()[1]}
		*w.tooltip.Pos() = w.pos.Add(mousePointerPositionLocal).Add(tooltipOffset)
		w.tooltip.Render()
	}
}

// ---

type DepStringerI interface {
	fmt.Stringer
	DepNode2I
}

type DepStringerFunc struct {
	content string
	DepNode2Func
}

func (this *DepStringerFunc) String() string {
	return this.content
}

// ---

// StringerWidget currently supports only single-line text.
type StringerWidget struct {
	Widget
	content        DepStringerI
	layoutDepNode2 DepNode2Func
}

func NewStringerWidget(pos mgl64.Vec2, content DepStringerI) *StringerWidget {
	w := &StringerWidget{
		Widget:  NewWidget(pos, mgl64.Vec2{0, 0}),
		content: content,
	}
	w.layoutDepNode2.UpdateFunc = func(DepNode2I) { w.Layout() }
	w.layoutDepNode2.AddSources(content) // TODO: What about removing w when it's "deleted"?
	return w
}

func (w *StringerWidget) Layout() {
	// TODO: Multiline support?
	longestLine := len(w.content.String())
	if longestLine < 3 {
		w.size[0] = float64(fontWidth * 3)
	} else {
		w.size[0] = float64(fontWidth * longestLine)
	}
	w.size[1] = float64(fontHeight * 1)

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *StringerWidget) LayoutNeeded() {
	MakeUpdated(&w.layoutDepNode2)
}

func (w *StringerWidget) Render() {
	DrawLGBox(w.pos, w.size)

	gl.Color3d(0, 0, 0)
	// TODO: Multiline support?
	NewOpenGLStream(w.pos).PrintText(w.content.String())
}

// ---

type FindPanel struct {
	FindBox      *TextBoxWidget
	OriginalView TextBoxScrollPaneView // View as it was when FindPanel was opened.

	Widgeter
}

func NewFindPanel(pos mgl64.Vec2, textBoxWidget *TextBoxWidget, caretPosition *caret.CaretPosition) (*FindPanel, *FindResults) {
	findResults := &FindResults{Owner: textBoxWidget}

	findBox := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true})

	numResultsStringer := &DepStringerFunc{}
	numResultsStringer.UpdateFunc = func(this DepNode2I) {
		findResults := this.GetSources()[0].(*FindResults)
		caretPosition := this.GetSources()[1].(*caret.CaretPosition)

		numResultsStringer.content = ""
		if index, match := findResults.MatchesResult(caretPosition.SelectionRange()); match {
			numResultsStringer.content += fmt.Sprintf("%d of ", index+1)
		}
		numResultsStringer.content += fmt.Sprintf("%d matches", findResults.NumResults())
	}
	numResultsStringer.AddSources(findResults, caretPosition)

	caseSensitive := NewTriButtonExternalStateWidget(np, func() bool { return true }, func() { fmt.Println("not yet implemented") })

	var wholeWordChange DepNode2Manual
	wholeWordAction := func() {
		findResults.WholeWord = !findResults.WholeWord
		ExternallyUpdated(&wholeWordChange)
	}
	wholeWordOnly := NewTriButtonExternalStateWidget(np, func() bool { return findResults.WholeWord }, wholeWordAction)

	findPanelWidget := NewBackgroundWidget(pos, NewFlowLayoutWidget(np, []Widgeter{
		NewSpacerWidget(np, NewFlowLayoutWidget(pos, []Widgeter{caseSensitive, NewTextLabelWidgetString(np, "Case")}, nil)),
		NewSpacerWidget(np, NewFlowLayoutWidget(pos, []Widgeter{wholeWordOnly, NewTextLabelWidgetString(np, "Whole")}, nil)),
		NewSpacerWidget(np, NewTextLabelWidgetString(np, "Find:")),
		NewSpacerWidget(np, findBox),
		NewSpacerWidget(np, NewStringerWidget(np, numResultsStringer)),
		NewSpacerWidget(np, NewButtonLabelWidget(np, "Next", nil)),
		NewSpacerWidget(np, NewButtonLabelWidget(np, "Previous", nil)),
	}, nil))

	findResults.AddSources(textBoxWidget.Content, findBox.Content, &wholeWordChange)

	return &FindPanel{
		FindBox:  findBox,
		Widgeter: findPanelWidget,
	}, findResults
}

func (this *FindPanel) SetKeyboardFocus() {
	// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
	keyboardPointer.OriginMapping = []Widgeter{this.FindBox}
}

// ---

type FindResults struct {
	Owner *TextBoxWidget

	WholeWord bool // Only look for whole words.

	segments []highlightSegment

	DepNode2
}

func (this *FindResults) Update() {
	content := this.GetSources()[0].(caret.MultilineContentI).Content()
	var findTarget string
	if findBox, ok := this.GetSources()[1].(caret.MultilineContentI); ok {
		findTarget = findBox.Content()
	} else if _, ok := this.GetSources()[1].(*WholeWordHighlighter); ok {
		// If the find panel is not visible, but a whole word is selected, use it as the find target instead.
		findTarget = this.Owner.caretPosition.GetSelectionContent()
	}

	this.segments = nil

	// HACK: Fake first element.
	this.segments = append(this.segments, highlightSegment{offset: 0})

	if findTarget != "" {
		var offset uint32
		nonresults := strings.Split(content, findTarget)
		if len(nonresults) > 1 {
			for _, nonresult := range nonresults[:len(nonresults)-1] {
				if this.WholeWord {
					content := this.GetSources()[0].(caret.MultilineContentI)

					wholeWord := caret.IsWholeWord2(content, offset+uint32(len(nonresult)), uint32(len(findTarget)))

					if !wholeWord {
						offset += uint32(len(nonresult))
						offset += uint32(len(findTarget))
						continue
					}
				}

				offset += uint32(len(nonresult))
				this.segments = append(this.segments, highlightSegment{offset: offset, color: mgl64.Vec3{1, 1, 1}})
				offset += uint32(len(findTarget))
				this.segments = append(this.segments, highlightSegment{offset: offset, color: mgl64.Vec3{0, 0, 0}})
			}
		}
	}

	// HACK: Fake last element.
	this.segments = append(this.segments, highlightSegment{offset: uint32(len(content))})

	// TODO: Is this the best place to do this? Shouldn't Update() not have event side-effects?
	// If find panel is visible and selected, update the selection.
	if this.Owner.isFindPanelVisible() && this.Owner.isFindPanelFindBoxSelected() {
		this.Owner.caretPosition.RestoreState(this.Owner.findPanel.OriginalView.caretPosition) // Move cursor but not view, so it doesn't jump.
		selStart, selEnd := this.Owner.caretPosition.SelectionRange()
		_ = selEnd // TODO: Verify if this the right way to not skip first selection...
		if start, end, ok := this.GetResult(selStart, selStart, +1); ok {
			this.Owner.caretPosition.SetSelection(start, end-start)
			this.Owner.CenterOnCaretPositionIfOffscreen()
		} else {
			this.Owner.RestoreView(this.Owner.findPanel.OriginalView)
		}
	}
}

// NumResults returns current number of find results.
func (this *FindResults) NumResults() int {
	if len(this.segments) <= 2 {
		return 0
	}
	return (len(this.segments) - 2) / 2
}

// MatchesResult returns true and index of result matched to the given start and end content index.
func (this *FindResults) MatchesResult(start uint32, end uint32) (index int, match bool) {
	// TODO: Should use binary search to optimize.
	for ; index < this.NumResults(); index++ {
		if start == this.segments[1+2*index].offset && end == this.segments[1+2*index+1].offset {
			return index, true
		}
	}
	return index, false
}

// TODO: Use a named const for direction or something to indicate it can only be +1 or -1.
func (this *FindResults) GetResult(start uint32, end uint32, direction int) (resultStart uint32, resultEnd uint32, ok bool) {
	if this.NumResults() == 0 {
		return 0, 0, false
	}

	switch direction {
	case +1:
		resultStart, resultEnd = this.nextResult(end)
		return resultStart, resultEnd, true
	case -1:
		resultStart, resultEnd = this.prevResult(start)
		return resultStart, resultEnd, true
	default:
		panic(0)
	}
}

// TODO: Dedup with prevResult.
// Pre-condition: this.NumResults() >= 1.
func (this *FindResults) nextResult(end uint32) (resultStart uint32, resultEnd uint32) {
	// TODO: Should use binary search to optimize.
	for index := 0; index < this.NumResults(); index++ {
		if end <= this.segments[1+2*index].offset {
			return this.segments[1+2*index].offset, this.segments[1+2*index+1].offset
		}
	}
	index := 0
	return this.segments[1+2*index].offset, this.segments[1+2*index+1].offset
}
func (this *FindResults) prevResult(start uint32) (resultStart uint32, resultEnd uint32) {
	// TODO: Should use binary search to optimize.
	for index := this.NumResults() - 1; index >= 0; index-- {
		if this.segments[1+2*index+1].offset <= start {
			return this.segments[1+2*index].offset, this.segments[1+2*index+1].offset
		}
	}
	index := this.NumResults() - 1
	return this.segments[1+2*index].offset, this.segments[1+2*index+1].offset
}

func (this *FindResults) NewIterator(offset uint32) HighlighterIterator {
	return NewHighlighterIterator(this, offset)
}

func (this *FindResults) Segment(index uint32) highlightSegment {
	if index < 0 {
		//fmt.Println("warning: Segment < 0")
		return highlightSegment{offset: 0}
	} else if index >= uint32(len(this.segments)) {
		//fmt.Println("warning: Segment index >= max") // TODO: Fix this.
		return highlightSegment{offset: this.segments[len(this.segments)-1].offset}
	} else {
		return this.segments[index]
	}
}
func (this *FindResults) LenSegments() int {
	return len(this.segments)
}
func (this *FindResults) SegmentToTextStyle(index uint32) *TextStyle {
	highlight := this.Segment(index).color[0] != 0

	borderColor := &darkColor
	if !highlight {
		borderColor = nil
	}
	return &TextStyle{
		BorderColor: &borderColor,
	}
}

// ---

type WholeWordHighlighter struct {
	wholeWord bool

	DepNode2
}

func (this *WholeWordHighlighter) Update() {
	content := this.GetSources()[0].(caret.MultilineContentI)
	caretPosition := this.GetSources()[1].(*caret.CaretPosition)

	this.wholeWord = caret.IsWholeWord(content, caretPosition)
}

func (this *WholeWordHighlighter) IsWholeWord() bool {
	return this.wholeWord
}

// ---

type TextBoxWidget struct {
	Widget
	Content        caret.MultilineContentI
	caretPosition  *caret.CaretPosition
	layoutDepNode2 DepNode2Func
	scrollToCaret  DepNode2Func // TODO: DepNode2Event?

	findPanel            *FindPanel
	findResults          *FindResults
	wholeWordHighlighter *WholeWordHighlighter
	wholeWordResults     *FindResults

	options TextBoxWidgetOptions

	// TESTS
	ValidChange TextBoxWidgetValidChange // TODO: This should probably be properly moved into DepNode2 or similar.

	ExtensionsTest      []Widgeter
	HighlightersTest    []Highlighter
	DynamicHighlighters []interface {
		Highlighter() Highlighter
	}
	LineHighlighter        LineHighlighter
	DynamicLineHighlighter func() LineHighlighter
	PopupsTest             []Widgeter
	DepsTest               []DepNode2I // Temporary solution until there's a better MultilineContentFunc.
}

type TextBoxWidgetValidChange struct {
	*TextBoxWidget
	DepNode2Manual
}

type TextBoxWidgetOptions struct {
	SingleLine bool
	Private    bool
	PopupTest  bool
	ValidFunc  func(caret.MultilineContentI) bool
	FindPanel  bool
}

func NewTextBoxWidget(pos mgl64.Vec2) *TextBoxWidget {
	mc := multilinecontent.New()
	return NewTextBoxWidgetExternalContent(pos, mc, nil)
}

func NewTextBoxWidgetOptions(pos mgl64.Vec2, options TextBoxWidgetOptions) *TextBoxWidget {
	mc := multilinecontent.New()
	return NewTextBoxWidgetExternalContent(pos, mc, &options)
}

func NewTextBoxWidgetExternalContent(pos mgl64.Vec2, mc caret.MultilineContentI, options *TextBoxWidgetOptions) *TextBoxWidget {
	if options == nil {
		options = &TextBoxWidgetOptions{}
	}

	w := &TextBoxWidget{
		Widget:        NewWidget(pos, mgl64.Vec2{0, 0}),
		Content:       mc,
		caretPosition: caret.NewCaretPosition(mc),
		options:       *options,
	}
	w.layoutDepNode2.UpdateFunc = func(DepNode2I) { w.NotifyChange() }
	w.layoutDepNode2.AddSources(mc) // TODO: What about removing w when it's "deleted"?
	w.ValidChange.TextBoxWidget = w

	// TEST
	w.scrollToCaret.UpdateFunc = func(DepNode2I) {
		if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
			expandedCaretPosition, caretLine := w.caretPosition.ExpandedPosition()

			scrollPane.ScrollToArea(mgl64.Vec2{float64(expandedCaretPosition * fontWidth), float64(caretLine * fontHeight)}, mgl64.Vec2{0, fontHeight})
		}
	}
	w.scrollToCaret.AddSources(w.caretPosition)

	if uri, ok := w.Content.GetUriForProtocol("file://"); ok && strings.HasSuffix(string(uri), ".go") {
		//if false {
		//if _, instant := w.Content.(*MultilineContentFuncInstant); !instant { // The MultilineContentFuncInstant hack is unsafe to use with highlighting
		highlightedGoContent := &highlightedGoContent{}
		highlightedGoContent.AddSources(mc)

		w.HighlightersTest = append(w.HighlightersTest, highlightedGoContent)
	}

	if w.options.FindPanel {
		w.findPanel, w.findResults = NewFindPanel(mgl64.Vec2{0, 0}, w, w.caretPosition) // TODO: Make it appear on bottom instead of (0, 0) top left corner.

		w.wholeWordHighlighter = &WholeWordHighlighter{}
		w.wholeWordHighlighter.AddSources(w.Content, w.caretPosition, &w.layoutDepNode2) // layoutDepNode2 is needed to ensure caret position is kept within bounds as a prerequisite.

		w.wholeWordResults = &FindResults{Owner: w, WholeWord: true}
		w.wholeWordResults.AddSources(w.Content, w.wholeWordHighlighter)
	}

	return w
}

// TODO: Improve horizontal centering.
func (w *TextBoxWidget) CenterOnCaretPosition() {
	// HACK: This kinda conflicts/overlaps with MakeUpdated(&w.scrollToCaret), which also tries to scroll the scroll pane... Find a better way.
	if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
		expandedCaretPosition, caretLine := w.caretPosition.ExpandedPosition()

		scrollPane.CenterOnArea(mgl64.Vec2{float64(expandedCaretPosition * fontWidth), float64(caretLine * fontHeight)}, mgl64.Vec2{0, fontHeight})
	}
}

// TODO: Improve horizontal centering.
func (w *TextBoxWidget) CenterOnCaretPositionIfOffscreen() {
	// HACK: This kinda conflicts/overlaps with MakeUpdated(&w.scrollToCaret), which also tries to scroll the scroll pane... Find a better way.
	if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
		expandedCaretPosition, caretLine := w.caretPosition.ExpandedPosition()

		// Check for visible lines.
		// TODO: Generalize this.
		const debugSmallerViewport = fontHeight
		beginLineIndex, endLineIndex := 0, w.Content.LenLines()
		if beginVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, debugSmallerViewport})[1] / fontHeight); beginVisibleLineIndex > beginLineIndex {
			beginLineIndex = intmath.MinInt(beginVisibleLineIndex, endLineIndex)
		}
		_, height := globalWindow.GetSize() // HACK: Should be some viewport
		height -= debugSmallerViewport
		if endVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, float64(height)})[1]/fontHeight + 1); endVisibleLineIndex < endLineIndex {
			endLineIndex = intmath.MaxInt(endVisibleLineIndex, beginLineIndex)
		}

		if int(caretLine) < beginLineIndex || int(caretLine) >= endLineIndex {
			scrollPane.CenterOnArea(mgl64.Vec2{float64(expandedCaretPosition * fontWidth), float64(caretLine * fontHeight)}, mgl64.Vec2{0, fontHeight})
		}
	}
}

type TextBoxScrollPaneView struct {
	caretPosition      caret.CaretPosition
	scrollPaneChildPos mgl64.Vec2
}

func (w *TextBoxWidget) SaveView() (view TextBoxScrollPaneView) {
	view.caretPosition = w.caretPosition.SaveState()

	if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
		view.scrollPaneChildPos = *scrollPane.child.Pos()
	}

	return view
}

func (w *TextBoxWidget) RestoreView(view TextBoxScrollPaneView) {
	w.caretPosition.RestoreState(view.caretPosition)

	if scrollPane, ok := w.Parent().(*ScrollPaneWidget); ok && scrollPane.child == w {
		*scrollPane.child.Pos() = view.scrollPaneChildPos
	}
}

func (w *TextBoxWidget) isFindPanelVisible() bool {
	for _, widget := range w.PopupsTest {
		if findPanel, ok := widget.(*FindPanel); ok && findPanel == w.findPanel {
			return true
		}
	}
	return false
}

func (w *TextBoxWidget) isFindPanelFindBoxSelected() bool {
	return keyboardPointer.OriginMapping.ContainsWidget(w.findPanel.FindBox)
}

func (w *TextBoxWidget) NotifyChange() {
	w.caretPosition.NotifyContentChanged()

	w.Layout()

	w.NotifyAllListeners()

	// TODO: This should probably be properly moved into DepNode2 or similar.
	if w.IsValidTEST() {
		ExternallyUpdated(&w.ValidChange)
	}

	// TODO: Figure out if this should be here... is it a big deal if it gets called here AND elsewhere?
	redraw = true
}

// TODO: Remove after done testing...
func (w *TextBoxWidget) IsValidTEST() bool {
	return w.options.ValidFunc == nil || w.options.ValidFunc(w.Content)
}

func (w *TextBoxWidget) PollLogic() {
	for _, extension := range w.ExtensionsTest {
		extension.PollLogic()
	}

	for _, dep := range w.DepsTest {
		MakeUpdated(dep)
	}

	if w.findResults != nil && w.isFindPanelVisible() {
		MakeUpdated(w.findResults)
	} else if w.wholeWordHighlighter != nil && !w.isFindPanelVisible() {
		MakeUpdated(w.wholeWordHighlighter)
		// TODO: Improve this... Need to add logic support for DepNode2 system?
		if w.wholeWordHighlighter.IsWholeWord() {
			MakeUpdated(w.wholeWordResults)
		}
	}

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.PollLogic()
}

func (w *TextBoxWidget) Layout() {
	if w.Content.LongestLine() < 3 {
		w.size[0] = float64(fontWidth * 3)
	} else {
		w.size[0] = float64(fontWidth * w.Content.LongestLine())
	}
	w.size[1] = float64(fontHeight * w.Content.LenLines())

	// TODO: Standardize this mess... have graph-level func that don't get overriden, and class-specific funcs to be overridden
	w.Widget.Layout()
}

func (w *TextBoxWidget) LayoutNeeded() {
	// HACK: Set parent of findPanel. Can't do this in constructor because insideScrollPane may not be true yet, etc. But is this really the place to do this?
	if w.findPanel != nil && w.findPanel.Parent() == nil {
		// HACK: Not general at all
		if scrollPane, insideScrollPane := w.Parent().(*ScrollPaneWidget); insideScrollPane && scrollPane.child == w {
			w.findPanel.SetParent(scrollPane)
		} else {
			w.findPanel.SetParent(w)
		}
	}

	MakeUpdated(&w.layoutDepNode2)
	MakeUpdated(&w.scrollToCaret)

	for _, widget := range w.PopupsTest {
		widget.LayoutNeeded()
	}
}

func (w *TextBoxWidget) Render() {
	// HACK: This is an update operation, so it should happen in PollLogic(). However, it seems putting it there causes crashes. Need to improve this.
	for _, highlighter := range w.HighlightersTest {
		MakeUpdated(highlighter)
	}
	for _, dynamicHighlighter := range w.DynamicHighlighters {
		if highlighter := dynamicHighlighter.Highlighter(); highlighter != nil {
			MakeUpdated(highlighter)
		}
	}
	// HACK: DynamicLineHighlighter currently simply overrides existing LineHighlighter.
	if w.DynamicLineHighlighter != nil {
		w.LineHighlighter = w.DynamicLineHighlighter()
	}
	if w.LineHighlighter != nil {
		MakeUpdated(w.LineHighlighter)
	}

	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer and its first mapping
	hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	// HACK: Brute-force check the mouse pointer if it contains this widget
	isOriginHit := false
	for _, hit := range mousePointer.OriginMapping {
		if w == hit {
			isOriginHit = true
			break
		}
	}
	isHit := len(w.HoverPointers()) > 0

	if w.options.ValidFunc == nil {
		// HACK: Assumes mousePointer rather than considering all connected pointing pointers
		if isOriginHit && mousePointer.State.IsActive() && isHit {
			DrawYBox(w.pos, w.size)
		} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
			DrawYBox(w.pos, w.size)
		} else if hasTypingFocus {
			DrawYBox(w.pos, w.size)
		} else {
			DrawNBox(w.pos, w.size)
		}
	} else {
		var background mgl64.Vec3
		if w.options.ValidFunc(w.Content) {
			background = lightGreenColor
		} else {
			background = lightRedColor
		}

		// HACK: Assumes mousePointer rather than considering all connected pointing pointers
		if isOriginHit && mousePointer.State.IsActive() && isHit {
			DrawBox(w.pos, w.size, highlightColor, background)
		} else if (isHit && !mousePointer.State.IsActive()) || isOriginHit {
			DrawBox(w.pos, w.size, highlightColor, background)
		} else if hasTypingFocus {
			DrawBox(w.pos, w.size, highlightColor, background)
		} else {
			DrawBox(w.pos, w.size, mgl64.Vec3{0.3, 0.3, 0.3}, background)
		}
	}

	// Render only visible lines.
	// TODO: Generalize this.
	const debugSmallerViewport = fontHeight
	beginLineIndex, endLineIndex := 0, w.Content.LenLines()
	if beginVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, debugSmallerViewport})[1] / fontHeight); beginVisibleLineIndex > beginLineIndex {
		beginLineIndex = intmath.MinInt(beginVisibleLineIndex, endLineIndex)
	}
	_, height := globalWindow.GetSize() // HACK: Should be some viewport
	height -= debugSmallerViewport
	if endVisibleLineIndex := int(WidgeterS{w}.GlobalToLocal(mgl64.Vec2{0, float64(height)})[1]/fontHeight + 1); endVisibleLineIndex < endLineIndex {
		endLineIndex = intmath.MaxInt(endVisibleLineIndex, beginLineIndex)
	}

	// Line Highlighter
	if w.LineHighlighter != nil {
		for lineIndex := beginLineIndex; lineIndex < endLineIndex; lineIndex++ {
			if backgroundColor := w.LineHighlighter.LineBackgroundColor(lineIndex); backgroundColor != nil {
				DrawBorderlessBox(mgl64.Vec2{w.pos[0], w.pos[1] + float64(fontHeight*lineIndex)}, mgl64.Vec2{w.size[0], fontHeight}, *backgroundColor)
			}
		}
	}

	// DEBUG, HACK: Temporarily use cursor to highlight entire line when inactive, etc.
	//if !hasTypingFocus {
	if w.options.ValidFunc == nil && w.LineHighlighter == nil && !w.caretPosition.AnySelection() { // TEST: Try to always highlight in subtly darker white (unless there's validation).
		_, caretLine := w.caretPosition.ExpandedPosition()

		// Highlight line
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)
		gl.Color3dv(&veryLightColor[0])
		gl.Recti(int32(0), int32(caretLine*fontHeight), int32(w.size[0]), int32(caretLine*fontHeight)+fontHeight)
		gl.PopMatrix()
	}

	{
		gl.Color3d(0, 0, 0)
		if !w.options.Private {
			hlIters := []HighlighterIterator{}
			for _, highlighter := range w.HighlightersTest {
				hlIters = append(hlIters, highlighter.NewIterator(w.Content.Line(beginLineIndex).Start()))
			}
			for _, dynamicHighlighter := range w.DynamicHighlighters {
				if highlighter := dynamicHighlighter.Highlighter(); highlighter != nil {
					hlIters = append(hlIters, highlighter.NewIterator(w.Content.Line(beginLineIndex).Start()))
				}
			}

			// Highlight search results or whole words.
			if w.findResults != nil && w.isFindPanelVisible() {
				hlIters = append(hlIters, w.findResults.NewIterator(w.Content.Line(beginLineIndex).Start()))
			} else if w.wholeWordHighlighter != nil && !w.isFindPanelVisible() && w.wholeWordHighlighter.IsWholeWord() {
				hlIters = append(hlIters, w.wholeWordResults.NewIterator(w.Content.Line(beginLineIndex).Start()))
			}

			// HACK, TODO: Manually add NewSelectionHighlighter for now, need to make this better
			{
				min, max := w.caretPosition.SelectionRange()
				hlIters = append(hlIters, NewSelectionHighlighterIterator(w.Content.Line(beginLineIndex).Start(), min, max, hasTypingFocus))
			}

			glt := NewOpenGLStream(w.pos.Add(mgl64.Vec2{0, float64(fontHeight * beginLineIndex)}))

			for _, hlIter := range hlIters {
				textStyle := hlIter.Current()
				textStyle.Apply(glt)
			}

			for contentOffset, contentSpan := w.Content.Line(beginLineIndex).Start(), uint32(0); contentOffset < w.Content.Line(endLineIndex).Start(); contentOffset += contentSpan {
				contentSpan = w.Content.Line(endLineIndex).Start() - contentOffset
				for _, hlIter := range hlIters {
					contentSpan = intmath.MinUint32(contentSpan, hlIter.Next())
				}

				glt.PrintText(w.Content.Content()[contentOffset : contentOffset+contentSpan])

				for _, hlIter := range hlIters {
					textStyle := hlIter.Advance(contentSpan)
					textStyle.Apply(glt)
				}
			}
		} else {
			for lineIndex := 0; lineIndex < w.Content.LenLines(); lineIndex++ {
				contentLine := w.Content.Line(lineIndex)
				NewOpenGLStream(mgl64.Vec2{w.pos[0], w.pos[1] + float64(fontHeight*lineIndex)}).PrintLine(strings.Repeat("*", int(contentLine.Length())))
			}
		}
	}

	// Display Go Errors via line highlighting.
	for _, uri := range w.Content.GetAllUris() {
		if _, ok := goCompileErrorsManagerTest.All[uri]; ok {
			glt := NewOpenGLStream(np)
			for lineIndex, messages := range goCompileErrorsManagerTest.All[uri] {
				if lineIndex < beginLineIndex || lineIndex >= endLineIndex {
					continue // Skip lines that are offscreen.
				}

				expandedLineLength := caret.ExpandedLength(w.Content.Content()[w.Content.Line(lineIndex).Start():w.Content.Line(lineIndex).End()], 0)
				for sameLineIndex, message := range messages {
					pos := w.pos.Add(mgl64.Vec2{fontWidth * float64(expandedLineLength+1), fontHeight * float64(lineIndex+sameLineIndex)})
					DrawInnerRoundedBox(pos, mgl64.Vec2{fontWidth * float64(caret.ExpandedLength(message, 0)), fontHeight}, darkColor, darkRedColor)
					gl.Color3d(0, 0, 0)
					glt.SetPos(pos)
					glt.PrintLine(message)
				}
			}
		}
	}

	if hasTypingFocus {
		expandedCaretPosition, caretLine := w.caretPosition.ExpandedPosition()

		// Draw caret
		gl.PushMatrix()
		gl.Translated(w.pos[0], w.pos[1], 0)
		gl.Color3d(0, 0, 0)
		gl.Recti(int32(expandedCaretPosition*fontWidth-1), int32(caretLine*fontHeight), int32(expandedCaretPosition*fontWidth+1), int32(caretLine*fontHeight)+fontHeight)
		gl.PopMatrix()
	}

	for _, widget := range w.PopupsTest {
		gl.PushMatrix()
		// HACK: Not general at all
		if _, insideScrollPane := w.Parent().(*ScrollPaneWidget); !insideScrollPane {
			gl.Translated(w.pos[0], w.pos[1], 0)
		}
		widget.Render()
		gl.PopMatrix()
	}
}
func (w *TextBoxWidget) Hit(ParentPosition mgl64.Vec2) []Widgeter {
	/*if len(w.Widget.Hit(ParentPosition)) > 0 {
		return []Widgeter{w}
	} else {
		return nil
	}*/
	LocalPosition := w.ParentToLocal(ParentPosition)

	if len(w.Widget.Hit(ParentPosition)) > 0 {
		hits := []Widgeter{w}
		for _, widget := range w.PopupsTest {
			// HACK: Not general at all
			if scrollPane, insideScrollPane := w.Parent().(*ScrollPaneWidget); insideScrollPane && scrollPane.child == w {
				popupHits := widget.Hit(ParentPosition)
				if len(popupHits) > 0 {
					return popupHits
				}
			} else {
				popupHits := widget.Hit(LocalPosition)
				if len(popupHits) > 0 {
					return popupHits
				}
			}
		}
		return hits
	} else {
		return nil
	}
}
func (w *TextBoxWidget) ProcessEvent(inputEvent InputEvent) {
	for _, extension := range w.ExtensionsTest {
		extension.ProcessEvent(inputEvent)
	}

	if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true &&
		inputEvent.Pointer.Mapping.ContainsWidget(w) && /* TODO: GetHoverer() */ // IsHit(this button) should be true
		inputEvent.Pointer.OriginMapping.ContainsWidget(w) { /* TODO: GetHoverer() */ // Make sure we're releasing pointer over same button that it originally went active on, and nothing is in the way (i.e. button is hoverer)

		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		if !keyboardPointer.OriginMapping.ContainsWidget(w) {
			// HACK: Not general at all
			if scrollPane, insideScrollPane := w.Parent().(*ScrollPaneWidget); insideScrollPane && scrollPane.child == w {
				keyboardPointer.OriginMapping = []Widgeter{w, scrollPane}
			} else {
				keyboardPointer.OriginMapping = []Widgeter{w}
			}
		}
	}

	// HACK: Should iterate over all typing pointers, not just assume keyboard pointer and its first mapping
	//hasTypingFocus := keyboardPointer != nil && keyboardPointer.OriginMapping.ContainsWidget(w)

	if inputEvent.Pointer.VirtualCategory == event.Pointing {
		if inputEvent.EventTypes[event.ButtonEvent] && inputEvent.InputId == 0 && inputEvent.Buttons[0] == true { // On mouse button 0 down
			// Leave selection if shift is held down
			leaveSelection := inputEvent.ModifierKey&glfw.ModShift != 0

			globalPosition := mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]}
			localPosition := WidgeterS{w}.GlobalToLocal(globalPosition)
			logicalPosition := mgl64.Vec2{localPosition[0] / fontWidth, localPosition[1] / fontHeight}
			w.caretPosition.SetPositionFromLogical(logicalPosition, leaveSelection)
		} else if inputEvent.EventTypes[event.AxisEvent] && inputEvent.InputId == 0 && inputEvent.Pointer.State.Button(0) { // On mouse move while button 0 down
			leaveSelection := true

			globalPosition := mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]}
			localPosition := WidgeterS{w}.GlobalToLocal(globalPosition)
			logicalPosition := mgl64.Vec2{localPosition[0] / fontWidth, localPosition[1] / fontHeight}
			w.caretPosition.SetPositionFromLogical(logicalPosition, leaveSelection)
		}
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
		switch glfw.Key(inputEvent.InputId) {
		case glfw.KeyBackspace:
			w.caretPosition.Backspace()
		case glfw.KeyDelete:
			w.caretPosition.CreateSelectionIfNone(+1)
			w.caretPosition.ReplaceSelectionWith("")
		case glfw.KeyEnter:
			if w.options.SingleLine {
				break
			}

			w.caretPosition.ReplaceSelectionWith("")

			tabCount := w.caretPosition.LeadingTabCount()

			w.caretPosition.ReplaceSelectionWith("\n" + strings.Repeat("\t", tabCount))

		case glfw.KeyTab:
			w.caretPosition.ReplaceSelectionWith("\t")
		case glfw.KeyLeft:
			if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModSuper {
				// Go to start of line.
				// TODO: Go to start of line-ish (toggle between real start and non-whitespace start); leave Move(-2) alone because it's used elsewhere for existing purpose
				w.caretPosition.Move(-2, inputEvent.ModifierKey&glfw.ModShift != 0)
			} else if inputEvent.ModifierKey & ^(glfw.ModShift|glfw.ModAlt) == 0 {
				w.caretPosition.TryMoveH(caret.Backward, inputEvent.ModifierKey&glfw.ModShift != 0, inputEvent.ModifierKey&glfw.ModAlt != 0)
			}
		case glfw.KeyRight:
			if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModSuper {
				// Go to end of line.
				w.caretPosition.Move(+2, inputEvent.ModifierKey&glfw.ModShift != 0)
			} else if inputEvent.ModifierKey & ^(glfw.ModShift|glfw.ModAlt) == 0 {
				w.caretPosition.TryMoveH(caret.Forward, inputEvent.ModifierKey&glfw.ModShift != 0, inputEvent.ModifierKey&glfw.ModAlt != 0)
			}
		case glfw.KeyUp:
			if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModSuper {
				w.caretPosition.Move(-3, inputEvent.ModifierKey&glfw.ModShift != 0)
			} else if inputEvent.ModifierKey & ^(glfw.ModShift|glfw.ModAlt) == 0 {
				w.caretPosition.TryMoveV(caret.Backward, inputEvent.ModifierKey&glfw.ModShift != 0, inputEvent.ModifierKey&glfw.ModAlt != 0)
			}
		case glfw.KeyDown:
			if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModSuper {
				w.caretPosition.Move(+3, inputEvent.ModifierKey&glfw.ModShift != 0)
			} else if inputEvent.ModifierKey & ^(glfw.ModShift|glfw.ModAlt) == 0 {
				w.caretPosition.TryMoveV(caret.Forward, inputEvent.ModifierKey&glfw.ModShift != 0, inputEvent.ModifierKey&glfw.ModAlt != 0)
			}
		case glfw.KeyA:
			if inputEvent.ModifierKey == glfw.ModSuper {
				w.caretPosition.SelectAll()
			} else if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModControl {
				// Go to start of line.
				// TODO: Go to start of line-ish (toggle between real start and non-whitespace start); leave Move(-2) alone because it's used elsewhere for existing purpose
				w.caretPosition.Move(-2, inputEvent.ModifierKey&glfw.ModShift != 0)
			}
		case glfw.KeyX:
			if !w.options.Private &&
				inputEvent.ModifierKey == glfw.ModSuper {

				w.caretPosition.CreateSelectionLineIfNone()
				if selectionContent := w.caretPosition.GetSelectionContent(); selectionContent != "" {
					globalWindow.SetClipboardString(selectionContent) // TODO: Don't use globalWindow
					w.caretPosition.ReplaceSelectionWith("")
				}
			}
		case glfw.KeyC:
			if !w.options.Private &&
				inputEvent.ModifierKey == glfw.ModSuper {

				s := w.caretPosition.SaveState()
				w.caretPosition.CreateSelectionLineIfNone()
				if selectionContent := w.caretPosition.GetSelectionContent(); selectionContent != "" {
					globalWindow.SetClipboardString(selectionContent) // TODO: Don't use globalWindow
				}
				w.caretPosition.RestoreState(s)
			}
		case glfw.KeyV:
			if inputEvent.ModifierKey == glfw.ModSuper {
				if clipboard := globalWindow.GetClipboardString(); clipboard != "" { // TODO: Don't use globalWindow
					w.caretPosition.ReplaceSelectionWith(clipboard)
				}
			}
		case glfw.KeyLeftBracket:
			if inputEvent.ModifierKey == glfw.ModSuper {
				w.caretPosition.DecreaseIndent()
			}
		case glfw.KeyRightBracket:
			if inputEvent.ModifierKey == glfw.ModSuper {
				w.caretPosition.IncreaseIndent()
			}
		case glfw.KeyE:
			if inputEvent.ModifierKey == glfw.ModSuper {
				if fileUri, ok := w.Content.GetUriForProtocol("file://"); ok {
					// Open in external editor.
					open.Open(fileUri.Path())
				}
			} else if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModControl {
				// Go to end of line.
				w.caretPosition.Move(+2, inputEvent.ModifierKey&glfw.ModShift != 0)
			}
		/*case glfw.KeyR:
		if inputEvent.ModifierKey == glfw.ModSuper {
			ExternallyUpdated(w.Content) // TODO: Need to make this apply only for event-based things; no point in forcibly updating pure data structures
		}*/
		case glfw.KeyS:
			if inputEvent.ModifierKey == glfw.ModSuper {
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if uri, ok := w.Content.GetUriForProtocol("file://"); ok {
					switch {
					case strings.HasSuffix(string(uri), ".go"):
						// Run `goimports` on Go source code.
						if out, err := goimports.Process("", []byte(w.Content.Content()), nil); err == nil {
							SetViewGroup(w.Content, string(out))
						}
						// Run `goreturns` on Go source code.
						/*if out, err := returns.Process("", "", []byte(w.Content.Content()), &returns.Options{Fragment: true}); err == nil {
							SetViewGroup(w.Content, string(out))
						}*/
					case strings.HasSuffix(string(uri), ".md") || strings.HasSuffix(string(uri), ".markdown"):
						// Run `markdownfmt` on Markdown.
						if out, err := markdown.Process("", []byte(w.Content.Content()), nil); err == nil {
							SetViewGroup(w.Content, string(out))
						}
					}
				}
			}
		case glfw.KeyR:
			if inputEvent.ModifierKey == glfw.ModSuper {
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if !w.options.PopupTest {
					break
				}

				popupTest := NewSearchableListWidget(mgl64.Vec2{200, 0}, mgl64.Vec2{600, 600}, globalGoSymbols)
				// HACK: Not general at all
				if scrollPane, insideScrollPane := w.Parent().(*ScrollPaneWidget); insideScrollPane && scrollPane.child == w {
					popupTest.SetParent(scrollPane)
				} else {
					popupTest.SetParent(w)
				}

				{
					scrollToSymbolB := DepNode2Func{}
					scrollToSymbolB.UpdateFunc = func(this DepNode2I) {
						entry := this.GetSources()[0].(Selecter).GetSelected()
						if entry == nil {
							return
						}

						// TODO: Replace with entry.(Something).CaretPositionStart, End -> editor.ScrollToCaret(Start, End)

						nodeStringer := entry.(NodeStringer)

						file := globalParsedFile.fset.File(nodeStringer.Pos())
						if file == nil {
							return
						}

						pos, end := nodeStringer.Pos(), nodeStringer.End()

						w.caretPosition.SetSelection(uint32(file.Offset(pos)), uint32(end-pos))
						w.CenterOnCaretPositionIfOffscreen()
					}
					scrollToSymbolB.AddSources(popupTest.OnSelectionChanged())
					keepUpdatedTEST = append(keepUpdatedTEST, &scrollToSymbolB)
				}

				originalMapping := keyboardPointer.OriginMapping // HACK
				originalView := w.SaveView()
				closeOnEscape := &CustomWidget{
					Widget: NewWidget(np, np),
					ProcessEventFunc: func(inputEvent InputEvent) {
						if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
							switch glfw.Key(inputEvent.InputId) {
							case glfw.KeyEnter:
								// Remove popupTest from w.PopupsTest.
								for i, widget := range w.PopupsTest {
									if widget == popupTest {
										w.PopupsTest = append(w.PopupsTest[:i], w.PopupsTest[i+1:]...)
										break
									}
								}

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							case glfw.KeyEscape:
								// Remove popupTest from w.PopupsTest.
								for i, widget := range w.PopupsTest {
									if widget == popupTest {
										w.PopupsTest = append(w.PopupsTest[:i], w.PopupsTest[i+1:]...)
										break
									}
								}

								w.RestoreView(originalView)

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							}
						}
					},
				}
				popupTest.ExtensionsTest = append(popupTest.ExtensionsTest, closeOnEscape)

				w.PopupsTest = append(w.PopupsTest, popupTest)

				popupTest.SetKeyboardFocus()
			}
		// Find panel.
		case glfw.KeyF:
			if inputEvent.ModifierKey == glfw.ModSuper {
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if !(w.options.PopupTest && w.options.FindPanel) {
					break
				}

				popupTest := w.findPanel

				if !w.isFindPanelVisible() {
					originalMapping := keyboardPointer.OriginMapping // HACK
					w.findPanel.OriginalView = w.SaveView()
					closeOnEscape := &CustomWidget{
						Widget: NewWidget(np, np),
						ProcessEventFunc: func(inputEvent InputEvent) {
							if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
								switch glfw.Key(inputEvent.InputId) {
								case glfw.KeyEnter:
									// HACK: I should map it so Enter triggers the same action as Cmd+G handler, instead of faking it here...
									inputEvent.InputId = uint16(glfw.KeyG)
									inputEvent.ModifierKey |= glfw.ModSuper
									w.ProcessEvent(inputEvent)
								case glfw.KeyEscape:
									// Remove popupTest from w.PopupsTest.
									for i, widget := range w.PopupsTest {
										if widget == popupTest {
											w.PopupsTest = append(w.PopupsTest[:i], w.PopupsTest[i+1:]...)
											break
										}
									}

									//w.RestoreView(w.findPanel.OriginalView)

									// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
									keyboardPointer.OriginMapping = originalMapping

								// HACK: I should make it so Cmd+F triggers the parent's Cmd+F handler, instead of faking it here...
								case glfw.KeyF:
									if inputEvent.ModifierKey == glfw.ModSuper {
										w.findPanel.FindBox.caretPosition.SelectAll()
									}
								// HACK: I should make it so Cmd+G triggers the parent's Cmd+G handler, instead of faking it here...
								case glfw.KeyG:
									w.ProcessEvent(inputEvent)
								}
							}
						},
					}
					w.findPanel.FindBox.ExtensionsTest = []Widgeter{closeOnEscape} // HACK: Since I'm reusing an existing object, I need to update its extension rather than add new one. But doing it this way effectively prevents any other extensions to be added elsewhere, etc. Number of times I was bitten by this hack so far: 1.

					w.PopupsTest = append(w.PopupsTest, popupTest)
				}

				popupTest.SetKeyboardFocus()

				if w.caretPosition.AnySelection() {
					// Set find text to selection.
					SetViewGroup(w.findPanel.FindBox.Content, w.caretPosition.GetSelectionContent())
				}
				w.findPanel.FindBox.caretPosition.SelectAll()
			}
		case glfw.KeyMinus:
			if inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModControl {
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if !(w.options.PopupTest && w.options.FindPanel) {
					break
				}

				// HACK: Need to properly implement Cmd+-, instead of this temporary most-common-use hack.
				w.RestoreView(w.findPanel.OriginalView)
			}
		case glfw.KeyG:
			switch {
			case inputEvent.ModifierKey & ^glfw.ModShift == glfw.ModSuper:
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if !(w.options.PopupTest && w.options.FindPanel) {
					break
				}

				direction := +1
				if shift := inputEvent.ModifierKey&glfw.ModShift != 0; shift {
					direction = -1
				}

				selStart, selEnd := w.caretPosition.SelectionRange()
				MakeUpdated(w.findResults)
				if start, end, ok := w.findResults.GetResult(selStart, selEnd, direction); ok {
					w.caretPosition.SetSelection(start, end-start)
					w.CenterOnCaretPositionIfOffscreen()
				}
			// Ctrl+G opens a Go To Line box.
			case inputEvent.ModifierKey == glfw.ModControl:
				// TODO: Move this compoment out of TextBoxWidget; make it dynamically attachable or something.
				if !w.options.PopupTest {
					break
				}

				textBox := NewTextBoxWidget(np)
				SetViewGroup(textBox.Content, strconv.Itoa(w.caretPosition.LineNumber()))
				textBox.caretPosition.SelectAll()
				popupTest := NewBackgroundWidget(mgl64.Vec2{200, 0}, NewFlowLayoutWidget(np, []Widgeter{
					NewSpacerWidget(np, NewTextLabelWidgetString(np, "Go To Line:")),
					NewSpacerWidget(np, textBox),
				}, nil))

				// HACK: Not general at all
				if scrollPane, insideScrollPane := w.Parent().(*ScrollPaneWidget); insideScrollPane && scrollPane.child == w {
					popupTest.SetParent(scrollPane)
				} else {
					popupTest.SetParent(w)
				}

				// HACK: Duplicated code, need to refactor
				{
					scrollToLine := DepNode2Func{}
					scrollToLine.UpdateFunc = func(this DepNode2I) {
						if lineNumber, err := strconv.Atoi(this.GetSources()[0].(caret.MultilineContentI).Content()); err == nil {
							w.caretPosition.TrySetPositionAtLineIndex(lineNumber - 1)
							w.CenterOnCaretPosition()
						}
					}
					scrollToLine.AddSources(textBox.Content)
					keepUpdatedTEST = append(keepUpdatedTEST, &scrollToLine)
				}

				originalMapping := keyboardPointer.OriginMapping // HACK
				originalView := w.SaveView()
				closeOnEscape := &CustomWidget{
					Widget: NewWidget(np, np),
					ProcessEventFunc: func(inputEvent InputEvent) {
						if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
							switch glfw.Key(inputEvent.InputId) {
							case glfw.KeyEnter:
								// Remove popupTest from w.PopupsTest.
								for i, widget := range w.PopupsTest {
									if widget == popupTest {
										w.PopupsTest = append(w.PopupsTest[:i], w.PopupsTest[i+1:]...)
										break
									}
								}

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							case glfw.KeyEscape:
								// Remove popupTest from w.PopupsTest.
								for i, widget := range w.PopupsTest {
									if widget == popupTest {
										w.PopupsTest = append(w.PopupsTest[:i], w.PopupsTest[i+1:]...)
										break
									}
								}

								w.RestoreView(originalView)

								// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
								keyboardPointer.OriginMapping = originalMapping
							}
						}
					},
				}
				textBox.ExtensionsTest = append(textBox.ExtensionsTest, closeOnEscape)

				w.PopupsTest = append(w.PopupsTest, popupTest)

				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				keyboardPointer.OriginMapping = []Widgeter{textBox}
			}
		case glfw.KeyD:
			if inputEvent.ModifierKey == glfw.ModSuper {
				w.caretPosition.ExpandSelectionToWord()
				if w.options.FindPanel && w.caretPosition.AnySelection() {
					// Set find text to selection.
					SetViewGroup(w.findPanel.FindBox.Content, w.caretPosition.GetSelectionContent())
				}
			}
		case glfw.KeyEscape:
			// Close the last popup, if any.
			if len(w.PopupsTest) > 0 {
				w.PopupsTest = w.PopupsTest[:len(w.PopupsTest)-1]
			}
		// TEST: Closing this widget...
		case glfw.KeyW:
			if inputEvent.ModifierKey == glfw.ModControl {
				/*for i, widget := range widgets {
					if widget == w {
						widgets = append(widgets[:i], widgets[i+1:]...)
						break
					}
				}*/
			}
		}
	}

	if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.CharacterEvent] && inputEvent.InputId < 128 {
		w.caretPosition.ReplaceSelectionWith(string(inputEvent.InputId))
	}
}

func (w *TextBoxWidget) Close() error {
	for _, extension := range w.ExtensionsTest {
		extension.Close()
	}
	return nil
}

// ---

type TextFileWidget struct {
	*TextBoxWidget
}

func NewTextFileWidget(pos mgl64.Vec2, path string) *TextFileWidget {
	// TODO: Opening the same file shouldn't result in a new MultilineContentFile
	ec := NewMultilineContentFile(path)
	w := &TextFileWidget{TextBoxWidget: NewTextBoxWidgetExternalContent(pos, ec, nil)}
	return w
}

func (w *TextFileWidget) Path() string {
	return w.TextBoxWidget.Content.(*MultilineContentFile).Path()
}

// ---

func NewTextBoxValidationWidget(pos mgl64.Vec2, validFunc func(caret.MultilineContentI) bool) *TextBoxWidget {
	w := NewTextBoxWidgetOptions(pos, TextBoxWidgetOptions{ValidFunc: validFunc})
	return w
}

// ---

type Clock struct {
	DepNode

	TimePassed float64
}

var UniversalClock Clock

// ---

type Pointer struct {
	VirtualCategory event.VirtualCategory
	Mapping         Widgeters // Always reflects current pointer state.
	OriginMapping   Widgeters // Updated only when pointer is moved while not active (e.g., where mouse button was first pressed down).
	State           event.PointerState
}

func (this *Pointer) Render() {
	switch {
	case this.VirtualCategory == event.Pointing && len(this.State.Axes) >= 2:
		// Prevent pointer from being drawn when the OS mouse pointer is visible.
		if this == mousePointer {
			// HACK
			var windowSize [2]int
			if globalWindow != nil {
				windowSize[0], windowSize[1] = globalWindow.GetSize()
			}

			// HACK: OS X specific.
			const border = 3
			if this.State.Axes[1] < 0 || this.State.Axes[0] < border || this.State.Axes[0] >= float64(windowSize[0])-border || this.State.Axes[1] >= float64(windowSize[1])-border {
				break
			}
		}

		gl.PushMatrix()
		defer gl.PopMatrix()
		gl.Translated(float64(NearInt64(this.State.Axes[0]))+0.5, float64(NearInt64(this.State.Axes[1]))+0.5, 0)

		const size float64 = fontHeight
		gl.Color3d(1, 1, 1)
		gl.Begin(gl.TRIANGLE_FAN)
		gl.Vertex2d(0, 0)
		gl.Vertex2d(0, size)
		gl.Vertex2d(size*0.85*math.Sin(math.Pi/8), size*0.85*math.Cos(math.Pi/8))
		gl.Vertex2d(size/math.Sqrt2, size/math.Sqrt2)
		gl.End()

		gl.Begin(gl.LINE_LOOP)
		gl.Color3d(0, 0, 0)
		gl.Vertex2d(0, 0)
		gl.Vertex2d(0, size)
		gl.Color3d(0.75, 0.75, 0.75)
		gl.Vertex2d(size*0.85*math.Sin(math.Pi/8), size*0.85*math.Cos(math.Pi/8))
		gl.Color3d(0, 0, 0)
		gl.Vertex2d(size/math.Sqrt2, size/math.Sqrt2)
		gl.End()
	}
}

type InputEvent struct {
	Pointer    *Pointer
	EventTypes map[event.EventType]bool
	InputId    uint16
	// TODO: Add pointers to BeforeState and AfterState?

	Buttons []bool
	// TODO: Characters? Split into distinct event types, bundle up in an event frame based on time?
	Sliders     []float64
	Axes        []float64
	ModifierKey glfw.ModifierKey // HACK
}

const katOnly = false

func ProcessInputEventQueue(widget Widgeter, inputEventQueue []InputEvent) []InputEvent {
	for len(inputEventQueue) > 0 {
		inputEvent := inputEventQueue[0]

		if !katOnly {
			// TODO: Calculate whether a pointing pointer moved relative to canvas in a better way... what if canvas is moved via keyboard, etc.
			pointingPointerMovedRelativeToCanvas := inputEvent.Pointer.VirtualCategory == event.Pointing &&
				(inputEvent.EventTypes[event.AxisEvent] && inputEvent.InputId == 0 || inputEvent.EventTypes[event.SliderEvent] && inputEvent.InputId == 2)

			if pointingPointerMovedRelativeToCanvas {
				LocalPosition := mgl64.Vec2{inputEvent.Pointer.State.Axes[0], inputEvent.Pointer.State.Axes[1]}

				// Clear previously hit widgets
				for _, widget := range inputEvent.Pointer.Mapping {
					delete(widget.HoverPointers(), inputEvent.Pointer)
				}
				inputEvent.Pointer.Mapping = []Widgeter{}

				// Recalculate currently hit widgets
				inputEvent.Pointer.Mapping = append(inputEvent.Pointer.Mapping, widget.Hit(LocalPosition)...)
				for _, widget := range inputEvent.Pointer.Mapping {
					widget.HoverPointers()[inputEvent.Pointer] = true
				}
			}

			// Populate OriginMapping (but only when pointer is moved while not active, and this isn't a deactivation since that's handled below)
			if pointingPointerMovedRelativeToCanvas &&
				!inputEvent.EventTypes[event.PointerDeactivation] && !inputEvent.Pointer.State.IsActive() {

				inputEvent.Pointer.OriginMapping = make([]Widgeter, len(inputEvent.Pointer.Mapping))
				copy(inputEvent.Pointer.OriginMapping, inputEvent.Pointer.Mapping)
			}

			for _, widget := range inputEvent.Pointer.OriginMapping {
				widget.ProcessEvent(inputEvent)
			}

			// Populate OriginMapping (but only upon pointer deactivation event)
			if inputEvent.Pointer.VirtualCategory == event.Pointing && inputEvent.EventTypes[event.PointerDeactivation] {

				inputEvent.Pointer.OriginMapping = make([]Widgeter, len(inputEvent.Pointer.Mapping))
				copy(inputEvent.Pointer.OriginMapping, inputEvent.Pointer.Mapping)
			}
		} else {
			keyboardPointer.OriginMapping[0].ProcessEvent(inputEvent)
		}

		inputEventQueue = inputEventQueue[1:]
	}

	return inputEventQueue
}

func EnqueueInputEvent(inputEventQueue []InputEvent, inputEvent InputEvent) []InputEvent {
	preStateActive := inputEvent.Pointer.State.IsActive()

	{
		if inputEvent.EventTypes[event.ButtonEvent] {
			// Extend slice if needed.
			neededSize := int(inputEvent.InputId) + len(inputEvent.Buttons)
			if neededSize > len(inputEvent.Pointer.State.Buttons) {
				inputEvent.Pointer.State.Buttons = append(inputEvent.Pointer.State.Buttons, make([]bool, neededSize-len(inputEvent.Pointer.State.Buttons))...)
			}

			copy(inputEvent.Pointer.State.Buttons[inputEvent.InputId:], inputEvent.Buttons)
		}

		if inputEvent.EventTypes[event.AxisEvent] {
			// Extend slice if needed.
			neededSize := int(inputEvent.InputId) + len(inputEvent.Axes)
			if neededSize > len(inputEvent.Pointer.State.Axes) {
				inputEvent.Pointer.State.Axes = append(inputEvent.Pointer.State.Axes, make([]float64, neededSize-len(inputEvent.Pointer.State.Axes))...)
			}

			copy(inputEvent.Pointer.State.Axes[inputEvent.InputId:], inputEvent.Axes)
		}

		inputEvent.Pointer.State.Time = time.Now()
	}

	postStateActive := inputEvent.Pointer.State.IsActive()

	switch {
	case !preStateActive && postStateActive:
		inputEvent.EventTypes[event.PointerActivation] = true
	case preStateActive && !postStateActive:
		inputEvent.EventTypes[event.PointerDeactivation] = true
	}

	return append(inputEventQueue, inputEvent)
}

// ---

// fileDiffName returns the name of a FileDiff as Markdown.
func fileDiffName(fileDiff *diff.FileDiff) string {
	origName := strings.TrimPrefix(fileDiff.OrigName, "a/")
	newName := strings.TrimPrefix(fileDiff.NewName, "b/")
	switch {
	case origName != "/dev/null" && newName != "/dev/null" && origName == newName: // Modified.
		return newName
	case origName != "/dev/null" && newName != "/dev/null" && origName != newName: // Renamed.
		return origName + " -> " + newName
	case origName == "/dev/null" && newName != "/dev/null": // Added.
		return newName
	case origName != "/dev/null" && newName == "/dev/null": // Removed.
		return "~~" + origName + "~~"
	default:
		panic("unexpected *diff.FileDiff, no names")
	}
}

// fileDiffNameRaw returns a name of a FileDiff in raw form.
func fileDiffNameRaw(fileDiff *diff.FileDiff) string {
	origName := strings.TrimPrefix(fileDiff.OrigName, "a/")
	newName := strings.TrimPrefix(fileDiff.NewName, "b/")
	switch {
	case origName != "/dev/null" && newName != "/dev/null" && origName == newName: // Modified.
		return newName
	case origName != "/dev/null" && newName != "/dev/null" && origName != newName: // Renamed.
		return newName
	case origName == "/dev/null" && newName != "/dev/null": // Added.
		return newName
	case origName != "/dev/null" && newName == "/dev/null": // Removed.
		return origName
	default:
		panic("unexpected *diff.FileDiff, no names")
	}
}

func initHttpHandlers() {
	{
		assets := union.New(map[string]http.FileSystem{
			"/octicons": octicons.Assets,
			"/gfm":      gfmstyle.Assets,
		})
		fileServer := httpgzip.FileServer(assets, httpgzip.FileServerOptions{ServeError: httpgzip.Detailed})
		http.Handle("/assets/", http.StripPrefix("/assets", fileServer))
	}
	http.HandleFunc("/close", func(w http.ResponseWriter, req *http.Request) {
		fmt.Fprintln(w, "Closing.")
		keepRunning = false
	})
	/*http.HandleFunc("/widgets", func(w http.ResponseWriter, req *http.Request) {
		w.Write([]byte(goon.SdumpExpr(len(widgets))))
		fmt.Fprintln(w)
		fmt.Fprintf(w, "%#v\n", widgets)
	})*/
	http.Handle("/favicon.ico", http.NotFoundHandler())
	http.Handle("/diff/", http.StripPrefix("/diff", u10.MarkdownOptionsHandlerFunc(func(req *http.Request) ([]byte, *u10.Options, error) {
		var b string

		// TODO: Try to lookup the GoPackage rather than creating a new one.
		importPath := req.URL.Path[1:]
		skipGenerated, _ := strconv.ParseBool(req.URL.Query().Get("skip-generated"))
		if goPackage := GoPackageFromImportPath(importPath); goPackage != nil {
			b += `# import "` + importPath + "\"\n"

			goPackage.UpdateVcs()
			goPackage.UpdateVcsFields()

			// git diff against master.
			b += "\n" + "# git diff against master\n"

			if goPackage.Dir.Repo != nil {
				if workingDiffMaster := u6.GoPackageWorkingDiffMaster(goPackage); workingDiffMaster != "" {
					if !skipGenerated {
						// Stats (lines added/removed).
						cmd := exec.Command("git", "diff", "--stat", "--find-renames", "master")
						cmd.Dir = goPackage.Dir.Repo.Vcs.RootPath()
						if stat, err := cmd.CombinedOutput(); err == nil {
							b += "\n```\n" + strings.TrimSuffix(string(stat), "\n") + "\n```\n"
						}
					}

					if fileDiffs, err := diff.ParseMultiFileDiff([]byte(workingDiffMaster)); err == nil {
						for _, fileDiff := range fileDiffs {
							// Skip binary files for now; they have empty filenames until https://github.com/sourcegraph/go-diff/issues/10 is resolved.
							if fileDiff.OrigName == "" && fileDiff.NewName == "" {
								b += "\n" + "### (binary file skipped)" + "\n"
								continue
							}
							if skipGenerated {
								if generated, err := analysis.IsFileGenerated(goPackage.Dir.Repo.Vcs.RootPath(), fileDiffNameRaw(fileDiff)); err == nil && generated {
									continue
								}
							}
							b += "\n" + "## " + fileDiffName(fileDiff) + "\n"
							b += "\n```diff\n"
							if hunks, err := diff.PrintHunks(fileDiff.Hunks); err == nil {
								b += string(hunks)
							}
							b += "```\n"
						}
					} else {
						b += "\n```\n" + err.Error() + "\n```\n"
					}
				} else {
					b += "\n" + "_(no changes)_\n"
				}
			} else {
				b += "\n" + "_(no vcs)_\n"
			}
		} else {
			b += fmt.Sprintf("Package %q not found in %q (are you sure it's a valid Go package; maybe its subdir).\n", importPath, build.Default.GOPATH)
		}

		return []byte(b), &u10.Options{TableOfContents: true}, nil
	})))
	http.Handle("/status/", http.StripPrefix("/status", u10.MarkdownOptionsHandlerFunc(func(req *http.Request) ([]byte, *u10.Options, error) {
		var b string

		// TODO: Try to lookup the GoPackage rather than creating a new one.
		importPath := req.URL.Path[1:]
		if goPackage := GoPackageFromImportPath(importPath); goPackage != nil {
			b += `# import "` + importPath + "\"\n"

			goPackage.UpdateVcs()
			goPackage.UpdateVcsFields()

			if goPackage.Dir.Repo != nil {
				// Branches.
				b += "\n" + underline("Branches")
				b += "\n" + u6.Branches(goPackage.Dir.Repo, u6.BranchesOptions{Base: req.URL.Query().Get("base")})
			}

			b += "\n" + underline("Status")
			b += "\n```\n" + "`status.PorcelainPresenter(goPackage)`" + "\n```\n"

			if goPackage.Dir.Repo != nil {
				b += "\n```\n"
				if goPackage.Dir.Repo.VcsLocal.Status == "" {
					b += "nothing to commit, working directory clean\n\n"
				} else {
					b += goPackage.Dir.Repo.VcsLocal.Status + "\n"
				}
				b += "Branch: " + goPackage.Dir.Repo.VcsLocal.LocalBranch + "\n"
				b += "Local:  " + goPackage.Dir.Repo.VcsLocal.LocalRev + "\n"
				b += "Remote: " + goPackage.Dir.Repo.VcsRemote.RemoteRev + "\n"
				b += "```\n"

				// git diff.
				if workingDiff := u6.GoPackageWorkingDiff(goPackage); workingDiff != "" {
					b += "\n" + underline("git diff")
					cmd := exec.Command("git", "diff", "--stat", "--find-renames", "HEAD")
					cmd.Dir = goPackage.Dir.Repo.Vcs.RootPath()
					if stat, err := cmd.CombinedOutput(); err == nil {
						b += "\n```\n" + strings.TrimSuffix(string(stat), "\n") + "\n```\n"
					}
					b += "\n```diff\n" + workingDiff + "\n```\n"
				}

				// git diff against master.
				b += "\n" + underline("git diff against master")
				if workingDiffMaster := u6.GoPackageWorkingDiffMaster(goPackage); workingDiffMaster != "" {
					b += "\nView diff [here](/diff/" + importPath + ").\n"
				} else {
					b += "\n_(No diff.)_\n"
				}
			}
		} else {
			b += fmt.Sprintf("Package %q not found in %q (are you sure it's a valid Go package; maybe its subdir).\n", importPath, build.Default.GOPATH)
		}

		return []byte(b), &u10.Options{TableOfContents: true}, nil
	})))
	http.Handle("/status", u10.MarkdownOptionsHandlerFunc(func(req *http.Request) ([]byte, *u10.Options, error) {
		started := time.Now()

		short, _ := strconv.ParseBool(req.URL.Query().Get("short"))
		origin, _ := strconv.ParseBool(req.URL.Query().Get("origin")) // If set, compare against origin/master instead of just working directory.

		// rootPath -> []*GoPackage
		var goPackagesInRepo = make(map[string][]*GoPackage)

		MakeUpdated(goPackages)
		// TODO: Factor this out somewhere. A cached GoPackagesInRepo type similar to exp14.GoPackages? Or something?
		{
			inChan := make(chan interface{})
			go func() { // This needs to happen in the background because sending input will be blocked on reading output.
				for _, goPackage := range goPackages.Entries {
					inChan <- goPackage
				}
				close(inChan)
			}()
			reduceFunc := func(in interface{}) interface{} {
				goPackage := in.(*GoPackage)
				if rootPath := getRootPath(goPackage); rootPath != "" {
					return NewGoPackageRepo(rootPath, []*GoPackage{goPackage})
				}
				return nil
			}
			outChan := GoReduce(inChan, 64, reduceFunc)
			for out := range outChan {
				repo := out.(GoPackageRepo)
				goPackagesInRepo[repo.RootPath()] = append(goPackagesInRepo[repo.RootPath()], repo.GoPackages()[0])
			}
		}

		goon.DumpExpr(len(goPackagesInRepo))

		reduceFunc := func(in interface{}) interface{} {
			repo := in.(GoPackageRepo)

			goPackage := repo.GoPackages()[0]
			if goPackage.Dir.Repo != nil {
				// HACK: Invalidate cache, always.
				ExternallyUpdated(goPackage.Dir.Repo.VcsLocal.GetSources()[1].(DepNode2ManualI))

				MakeUpdated(goPackage.Dir.Repo.VcsLocal)
			}

			return repo
		}

		inChan := make(chan interface{})
		go func() { // This needs to happen in the background because sending input will be blocked on reading output.
			for rootPath, goPackages := range goPackagesInRepo {
				inChan <- NewGoPackageRepo(rootPath, goPackages)
			}
			close(inChan)
		}()
		outChan := GoReduce(inChan, 8, reduceFunc)

		var buf = bytes.NewBufferString("# GOPATH Workspace diff\n")

		var clean = true
		for out := range outChan {
			repo := out.(GoPackageRepo)
			goPackage := repo.GoPackages()[0]
			switch origin {
			case false:
				if goPackage.Dir.Repo.VcsLocal.Status == "" {
					continue
				}
			case true:
				if goPackage.Dir.Repo.VcsLocal.Status == "" && (goPackage.Dir.Repo.VcsLocal.Remote == "" || goPackage.Dir.Repo.VcsLocal.LocalRev == goPackage.Dir.Repo.VcsLocal.LocalRemoteRev) {
					continue
				}
			}

			repoImportPathPattern := GetRepoImportPathPattern(repo.RootPath(), goPackage.Bpkg.SrcRoot)
			fmt.Fprint(buf, "\n"+"## "+repoImportPathPattern+"\n")
			if goPackage.Dir.Repo.VcsLocal.Status != "" {
				fmt.Fprint(buf, "\n```\n"+goPackage.Dir.Repo.VcsLocal.Status+"```\n")
			}
			if goPackage.Dir.Repo.VcsLocal.Remote != "" && goPackage.Dir.Repo.VcsLocal.LocalRev != goPackage.Dir.Repo.VcsLocal.LocalRemoteRev {
				fmt.Fprint(buf, "\n```\n Local: "+goPackage.Dir.Repo.VcsLocal.LocalRev+"\nRemote: "+goPackage.Dir.Repo.VcsLocal.LocalRemoteRev+"\n```\n")
			}
			if !short {
				var workingDiff string
				switch origin {
				case false:
					workingDiff = u6.GoPackageWorkingDiff(goPackage)
				case true:
					workingDiff = u6.GoPackageWorkingDiffOriginMaster(goPackage)
				}
				if fileDiffs, err := diff.ParseMultiFileDiff([]byte(workingDiff)); err == nil {
					for _, fileDiff := range fileDiffs {
						fmt.Fprint(buf, "\n"+"#### "+fileDiffName(fileDiff)+"\n")
						fmt.Fprint(buf, "\n```diff\n")
						if hunks, err := diff.PrintHunks(fileDiff.Hunks); err == nil {
							fmt.Fprint(buf, string(hunks))
						}
						fmt.Fprint(buf, "```\n")
					}
				} else {
					fmt.Fprint(buf, "\n```\n"+err.Error()+"\n```\n")
				}
			}
			clean = false
		}
		if clean {
			fmt.Fprint(buf, "_(Working directory clean across all GOPATH workspaces.)_")
		}

		fmt.Printf("diffHandler: %v ms.\n", time.Since(started).Seconds()*1000)

		return buf.Bytes(), &u10.Options{TableOfContents: true}, nil
	}))

	http.Handle("/inline/", http.StripPrefix("/inline", markdown_http.MarkdownHandlerFunc(func(req *http.Request) ([]byte, error) {
		importPath := req.URL.Path[1:]

		// TODO: Cache this via DepNode2I
		buf := new(bytes.Buffer)
		buf.WriteString("```go\n")
		exp11.InlineDotImports(buf, importPath)
		buf.WriteString("\n```")

		return buf.Bytes(), nil
	})))
}

// underline returns an underlined s.
func underline(s string) string {
	return s + "\n" + strings.Repeat("-", runewidth.StringWidth(s)) + "\n"
}

func getRootPath(goPackage *GoPackage) (rootPath string) {
	if goPackage.Bpkg.Goroot {
		return ""
	}

	goPackage.UpdateVcs()
	if goPackage.Dir.Repo == nil {
		return ""
	} else {
		return goPackage.Dir.Repo.Vcs.RootPath()
	}
}

// ---

var startedProcess = time.Now()

func init() {
	if _, err := exec.LookPath("go"); err != nil {
		fmt.Fprintln(os.Stderr, "`go` command is required.")
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func init() {
	runtime.LockOSThread()
}

var gddoClient = gddo.Client{
	UserAgent: "Conception-go (https://github.com/shurcooL-legacy/Conception-go)",
}

func main() {
	//defer profile.Start(profile.CPUProfile).Stop()
	//defer profile.Start(profile.MemProfile).Stop()

	flag.Parse()

	fmt.Printf("go version %s %s/%s.\n", runtime.Version(), runtime.GOOS, runtime.GOARCH)

	var inputEventQueue []InputEvent
	var inputEventQueue2 = make(chan InputEvent, 32)
	var window *glfw.Window

	if *headlessFlag {
		runtime.UnlockOSThread()
	} else {
		// Verify the GLFW library and header versions match
		{
			major, minor, revision := glfw.GetVersion()
			match := (major == glfw.VersionMajor && minor == glfw.VersionMinor && revision == glfw.VersionRevision)
			if !match {
				panic("Error: GLFW library and header versions do not match.")
			}
		}
		err := glfw.Init()
		if err != nil {
			log.Fatalln("glfw.Init():", err)
		}
		fmt.Printf("glfw %s.\n", glfw.GetVersionString())
		defer glfw.Terminate()

		// Set the working directory to the root of the package, so that its assets can be accessed.
		{
			conceptionGo := GoPackageFromImportPath("github.com/shurcooL-legacy/Conception-go")
			if conceptionGo == nil {
				log.Fatalln("Unable to find github.com/shurcooL-legacy/Conception-go package in your GOPATH, it's needed to load assets.")
			}
			err := os.Chdir(conceptionGo.Bpkg.Dir)
			if err != nil {
				log.Fatalln("os.Chdir:", err)
			}
		}

		glfw.WindowHint(glfw.Samples, 8) // Anti-aliasing.
		//glfw.WindowHint(glfw.Decorated, glfw.False)
		switch *modeFlag {
		case 8:
			window, err = glfw.CreateWindow(fontWidth*80, fontHeight*24, "", nil, nil)
		case 1, 0:
			window, err = glfw.CreateWindow(1536, 960, "", nil, nil)
		case 9:
			window, err = glfw.CreateWindow(1536, 960, "diff", nil, nil)
		default:
			window, err = glfw.CreateWindow(980, 880, "", nil, nil)
		}
		if err != nil {
			panic(err)
		}
		globalWindow = window

		window.MakeContextCurrent()

		if err := gl.Init(); nil != err {
			log.Print(err)
		}
		{
			var samples int32
			gl.GetIntegerv(gl.SAMPLES, &samples)
			fmt.Printf("OpenGL %s %s %s; %s; %v samples.\n", gl.GoStr(gl.GetString(gl.VENDOR)), gl.GoStr(gl.GetString(gl.RENDERER)), gl.GoStr(gl.GetString(gl.VERSION)),
				gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION)), samples)
		}

		{
			m := glfw.GetPrimaryMonitor()
			vm := m.GetVideoMode()

			width, height := window.GetSize()
			window.SetPos((vm.Width-width)/2, (vm.Height-height)/2)
		}
		glfw.SwapInterval(1) // Vsync.

		InitFont()
		defer DeinitFont()

		window.SetCloseCallback(func(w *glfw.Window) {
			keepRunning = false
		})

		framebufferSizeCallback := func(w *glfw.Window, framebufferSize0, framebufferSize1 int) {
			gl.Viewport(0, 0, int32(framebufferSize0), int32(framebufferSize1))

			var windowSize [2]int
			windowSize[0], windowSize[1] = w.GetSize()

			// Update the projection matrix
			gl.MatrixMode(gl.PROJECTION)
			gl.LoadIdentity()
			gl.Ortho(0, float64(windowSize[0]), float64(windowSize[1]), 0, -1, 1)
			gl.MatrixMode(gl.MODELVIEW)

			inputEvent := InputEvent{
				Pointer:    windowPointer,
				EventTypes: map[event.EventType]bool{event.AxisEvent: true},
				InputId:    0,
				Buttons:    nil,
				Sliders:    nil,
				Axes:       []float64{float64(windowSize[0]), float64(windowSize[1])},
			}
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true
		}
		{
			var framebufferSize [2]int
			framebufferSize[0], framebufferSize[1] = window.GetFramebufferSize()
			framebufferSizeCallback(window, framebufferSize[0], framebufferSize[1])
		}
		window.SetFramebufferSizeCallback(framebufferSizeCallback)

		focusCallback := func(w *glfw.Window, focused bool) {
			// THINK: Is this the best way?
			if focused {
				ExternallyUpdated(windowFocusedEvent)
			}

			inputEvent := InputEvent{
				Pointer:    windowPointer,
				EventTypes: map[event.EventType]bool{event.ButtonEvent: true},
				InputId:    0,
				Buttons:    []bool{focused},
				Sliders:    nil,
				Axes:       nil,
			}
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true
		}
		window.SetFocusCallback(focusCallback)

		var lastMousePos mgl64.Vec2
		lastMousePos[0], lastMousePos[1] = window.GetCursorPos()
		MousePos := func(w *glfw.Window, x, y float64) {
			//fmt.Println("MousePos:", x, y)

			inputEvent := InputEvent{
				Pointer:    mousePointer,
				EventTypes: map[event.EventType]bool{event.SliderEvent: true},
				InputId:    0,
				Buttons:    nil,
				Sliders:    []float64{x - lastMousePos[0], y - lastMousePos[1]}, // TODO: Do this in a pointer general way?
			}
			if w.GetInputMode(glfw.CursorMode) != glfw.CursorDisabled {
				inputEvent.EventTypes[event.AxisEvent] = true
				inputEvent.Axes = []float64{x, y}
			}
			lastMousePos[0] = x
			lastMousePos[1] = y
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true // TODO: Move redraw = true elsewhere? Like somewhere within events processing? Or keep it in all event handlers?
		}
		window.SetCursorPosCallback(MousePos)
		MousePos(window, lastMousePos[0], lastMousePos[1])

		window.SetScrollCallback(func(w *glfw.Window, xoff float64, yoff float64) {
			inputEvent := InputEvent{
				Pointer:    mousePointer,
				EventTypes: map[event.EventType]bool{event.SliderEvent: true},
				InputId:    2,
				Buttons:    nil,
				Sliders:    []float64{yoff, xoff},
				Axes:       nil,
			}
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true // TODO: Move redraw = true elsewhere? Like somewhere within events processing? Or keep it in all event handlers?
		})

		window.SetMouseButtonCallback(func(w *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
			inputEvent := InputEvent{
				Pointer:     mousePointer,
				EventTypes:  map[event.EventType]bool{event.ButtonEvent: true},
				InputId:     uint16(button),
				Buttons:     []bool{action != glfw.Release},
				Sliders:     nil,
				Axes:        nil,
				ModifierKey: mods,
			}
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true // TODO: Move redraw = true elsewhere? Like somewhere within events processing? Or keep it in all event handlers?
		})

		window.SetKeyCallback(func(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
			/*if key == glfw.KeyEnter && action == glfw.Press {
				x, y := window.GetPos()
				window.SetPos(x-16, y)
			}*/

			inputEvent := InputEvent{
				Pointer:     keyboardPointer,
				EventTypes:  map[event.EventType]bool{event.ButtonEvent: true},
				InputId:     uint16(key),
				Buttons:     []bool{action != glfw.Release},
				Sliders:     nil,
				Axes:        nil,
				ModifierKey: mods,
			}
			//fmt.Println(key, action, mods)
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true // HACK
		})

		window.SetCharCallback(func(w *glfw.Window, char rune) {
			inputEvent := InputEvent{
				Pointer:    keyboardPointer,
				EventTypes: map[event.EventType]bool{event.CharacterEvent: true},
				InputId:    uint16(char),
				Buttons:    nil,
				Sliders:    nil,
				Axes:       nil,
			}
			inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
			redraw = true // HACK
		})

		window.SetDropCallback(func(w *glfw.Window, names []string) {
			goon.DumpExpr(names)
		})

		gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
		//gl.ClearColor(0.8, 0.3, 0.01, 1)
		//gl.ClearColor(0.85, 0.85, 0.85, 1)
		//gl.ClearColor(float32(backgroundColor[0]), float32(backgroundColor[1]), float32(backgroundColor[2]), 1)
	}

	// ---

	var widget Widgeter
	var widgets []Widgeter

	spinner := SpinnerWidget{Widget: NewWidget(mgl64.Vec2{20, 20}, mgl64.Vec2{0, 0}), Spinner: 0}

	switch *modeFlag {
	case 9:
		// Diff.
		{
			const c0, c1 = `const Tau = 2 * math.Pi

func DrawCircle(pos mathgl.Vec2d, size mathgl.Vec2d) {
	const x = 64

	gl.Color3dv((*gl.Double)(&borderColor[0]))
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(gl.Double(pos[0]), gl.Double(pos[1]))
	for i := 0; i <= x; i++ {
		gl.Vertex2d(gl.Double(pos[0]+math.Sin(Tau*float64(i)/x)*size[0]/2), ...)
	}
	gl.End()`, `
func DrawCircle(pos mathgl.Vec2d, size mathgl.Vec2d) {
	const TwoPi = math.Pi * 2

	const x = 64

	gl.Color3dv((*gl.Double)(&borderColor[0]))
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(gl.Double(pos[0]), gl.Double(pos[1]))
	for i := 0; i <= x; i++ {
		// Completely new line
		gl.Vertex2d(gl.Double(pos[0]+math.Sin(TwoPi*float64(i)/x)*size[0]/2), ...)
	}
	gl.End()`

			box1 := NewTextBoxWidgetExternalContent(np, multilinecontent.NewString(c0), nil)
			box2 := NewTextBoxWidgetExternalContent(np, multilinecontent.NewString(c1), nil)

			windowSize0, windowSize1 := window.GetSize()
			widgets = append(widgets, NewScrollPaneWidget(mgl64.Vec2{0, fontHeight + 2}, mgl64.Vec2{float64(windowSize0/2 - 2), float64(windowSize1 - fontHeight - 4)}, box1))
			widgets = append(widgets, NewScrollPaneWidget(mgl64.Vec2{float64(windowSize0 / 2), fontHeight + 2}, mgl64.Vec2{float64(windowSize0/2 - 2), float64(windowSize1 - fontHeight - 4)}, box2))

			if false {
				highlightedDiff := &highlightedDiff{}
				highlightedDiff.AddSources(box1.Content, box2.Content)

				box1.HighlightersTest = append(box1.HighlightersTest, &highlightedDiffSide{highlightedDiff: highlightedDiff, side: 0})
				box2.HighlightersTest = append(box2.HighlightersTest, &highlightedDiffSide{highlightedDiff: highlightedDiff, side: 1})
			} else {
				lineDiff := &lineDiff{}
				lineDiff.AddSources(box1.Content, box2.Content)

				lineDiffSide0 := &lineDiffSide{lineDiff: lineDiff, side: 0}
				lineDiffSide1 := &lineDiffSide{lineDiff: lineDiff, side: 1}

				box1.HighlightersTest = append(box1.HighlightersTest, lineDiffSide0)
				box2.HighlightersTest = append(box2.HighlightersTest, lineDiffSide1)

				box1.LineHighlighter = lineDiffSide0
				box2.LineHighlighter = lineDiffSide1
			}
		}
	case 8:
		{
			widgets = append(widgets, NewChannelExpeWidget(mgl64.Vec2{10, 220}))

			{
				w := NewFooWidget(mgl64.Vec2{200, 200})
				widgets = append(widgets, w)
			}

			{
				w := NewFooWidget2(mgl64.Vec2{200, 640})
				widgets = append(widgets, w)
			}
		}
	case 7:
		{
			//w := NewTextFileWidget(mgl64.Vec2{200, 200}, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/github.com/shurcooL/play/31/main.go")
			//widgets = append(widgets, w)

			editorContent := multilinecontent.New()
			w := NewTextBoxWidgetExternalContent(mgl64.Vec2{200, 200}, editorContent, nil)
			openedFile := NewFileView("/Users/Dmitri/Dropbox/Work/2013/GoLand/src/github.com/shurcooL/play/31/main.go")
			openedFile.AddAndSetViewGroup(editorContent, readFileOrEmpty(openedFile.path))
			widgets = append(widgets, w)
		}
	case 6:
		{
			/*{
				w := NewFolderListingWidget(mgl64.Vec2{200, 200}, "./")
				widgets = append(widgets, w)
			}*/

			{
				entries := NewSliceStringerS("one", "two", "three")
				w := NewSelecterWidget(mgl64.Vec2{500, 200}, entries, nil)
				widgets = append(widgets, w)
			}

			{
				var fs vfs.FileSystem
				switch 0 {
				case 0:
					fs = vfs.OS("../")
					/*case 1:
					cloneUrl, err := url.Parse("https://github.com/shurcooL/Hover")
					if err != nil {
						panic(err)
					}

					sg := vcsclient.New(&url.URL{Scheme: "http", Host: "vcsstore.sourcegraph.com"}, nil)

					r, err := sg.Repository("git", cloneUrl)
					if err != nil {
						panic(err)
					}

					// 92118397d269b8d3bb480c1cf4e4171060782937 -> a25cf127d9d679f86063f20bbae8552748220273
					fs, err = r.FileSystem(sg_vcs.CommitID("92118397d269b8d3bb480c1cf4e4171060782937"))
					if err != nil {
						panic(err)
					}*/
				}

				/*w0 := NewVfsListing0Widget(mgl64.Vec2{200, 400}, fs, "/")
				widgets = append(widgets, w0)*/

				w := NewVfsListingWidget(mgl64.Vec2{500, 400}, fs, "/")
				widgets = append(widgets, w)
			}

			{
				fs := onlyGoFiles{FileSystem: vfs.OS("./")}

				w := NewVfsListingWidget(mgl64.Vec2{200, 600}, fs, "/")
				widgets = append(widgets, w)
			}
		}
	case 5:
		{
			//entries := NewSliceStringerS("one", "two", "three")
			//entries := &goPackagesSliceStringer{goPackages}
			entries := NewSliceStringerAllGoPackages("/Users/Dmitri/Dropbox/Work/2013/Data Sets/all-Go-packages.json")

			w := NewSearchableListWidgetAction(mgl64.Vec2{200, 0}, mgl64.Vec2{600, 600}, entries)
			widgets = append(widgets, w)

			var foo DepNode2Func
			foo.UpdateFunc = func(DepNode2I) {
				fmt.Println("Changed to", w.OnSelectionChanged().GetSelected(), "at", time.Since(startedProcess).Seconds())
			}
			foo.AddSources(w.OnSelectionChanged())
			keepUpdatedTEST = append(keepUpdatedTEST, &foo)
		}
	case 4:

		//source := NewTextFileWidget(mathgl.Vec2d{50, 160}, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/gist.github.com/7176504.git/main.go")
		source := NewTextBoxWidget(mgl64.Vec2{50, 160})
		widgets = append(widgets, source)

		parsedFile := &parsedFile{}
		parsedFile.AddSources(source.Content)

		params := func() interface{} {
			return []interface{}{
				parsedFile.fset,
				parsedFile.fileAst,
				parsedFile.err,
			}
		}

		action := func(params interface{}) string {
			fset := params.([]interface{})[0].(*token.FileSet)
			fileAst := params.([]interface{})[1].(*ast.File)
			parseErr, _ := params.([]interface{})[2].(error)

			if fset == nil || fileAst == nil {
				return "<Go parsing error>"
			}

			/*defer func() {
				_ = recover()
			}()*/

			var buf bytes.Buffer
			err := (&printer.Config{Mode: printer.UseSpaces | printer.TabIndent, Tabwidth: 8}).Fprint(&buf, fset, fileAst)
			if err != nil {
				panic(err)
			}

			if parseErr != nil {
				buf.WriteString("\n---\n" + parseErr.Error())
			}

			return buf.String()
		}

		w := NewLiveGoroutineExpeWidget(mgl64.Vec2{500, 160}, true, []DepNode2I{parsedFile}, params, action)
		widgets = append(widgets, w)

		{
			mc1 := multilinecontent.New()
			b1 := NewTextBoxWidgetExternalContent(mgl64.Vec2{400, 800}, mc1, nil)

			mc2 := multilinecontent.NewReverse()
			mc2.AddAndSetViewGroup(mc1, "")
			b2 := NewTextBoxWidgetExternalContent(mgl64.Vec2{800, 800}, mc2, nil)

			widgets = append(widgets, b1, b2)
		}

		// TEST: Bunch of buttons with spacing.
		{
			widgets = append(widgets, NewFlowLayoutWidget(mgl64.Vec2{500, 900}, []Widgeter{
				NewSpacerWidget(np, NewButtonWidget(np, nil)),
				NewSpacerWidget(np, NewButtonWidget(np, nil)),
				NewSpacerWidget(np, NewButtonWidget(np, nil)),
				NewSpacerWidget(np, NewTriButtonExternalStateWidget(np, func() bool { return true }, nil)),
				NewSpacerWidget(np, NewTextLabelWidgetString(np, "Label!")),
				NewSpacerWidget(np, NewTextBoxWidget(np)),
				NewSpacerWidget(np, NewButtonWidget(np, nil)),
			}, nil))
		}

		// TEST: GoonWidget improvements...
		{
			type Inner struct {
				Field1 string
				Field2 int
			}
			type Lang struct {
				Name  string
				Year  int
				URLs  [2]string
				Inner Inner
				Bool  bool
			}
			x := Lang{
				Name: "Go",
				Year: 2009,
				URLs: [2]string{"http", "https"},
				Inner: Inner{
					Field1: "Secret!",
					Field2: 123367,
				},
				Bool: true,
			}

			someString := "Can you edit me?"
			widgets = append(widgets, NewGoonWidget(mgl64.Vec2{600, 296}, &someString))
			widgets = append(widgets, NewGoonWidget(mgl64.Vec2{600 - 100, 296 + 20}, &x))

			// *ast.File goon
			src := `package main

import (
	"fmt"
	"io/ioutil"
	"os"

	"github.com/shurcooL/markdownfmt/markdown"
)

func main() {
	input, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		panic(err)
	}

	output, err := markdown.Process("", input, nil)
	if err != nil {
		panic(err)
	}

	fmt.Print(string(output))
}
`
			fset := token.NewFileSet()
			fileAst, err := parser.ParseFile(fset, "", src, 0 /*parser.ParseComments|parser.AllErrors*/)
			if err != nil {
				panic(err)
			}

			widgets = append(widgets, NewGoonWidget(mgl64.Vec2{600, 296 + 40}, &fileAst))
			widgets = append(widgets, NewGoonWidget(mgl64.Vec2{600, 296 + 60}, &parsedFile))

			output := NewTextBoxWidget(mgl64.Vec2{1000, 300})
			widgets = append(widgets, output)

			dumpButton := NewButtonWidget(mgl64.Vec2{600 - 20, 296}, func() {
				goon.DumpExpr(x)
				goon.DumpExpr(someString)
				SetViewGroup(output.Content, printerutil.SprintAstBare(fileAst))
			})
			widgets = append(widgets, dumpButton)
		}

	case 3:

		editor := NewTextBoxWidgetExternalContent(mgl64.Vec2{0, 200}, multilinecontent.NewString(`package main

import (
	"fmt"
	"io/ioutil"
	"os"

	"github.com/shurcooL/markdownfmt/markdown"
)

func main() {
	input, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		panic(err)
	}

	output, err := markdown.Process("", input, nil)
	if err != nil {
		panic(err)
	}

	fmt.Print(string(output))
}
`), &TextBoxWidgetOptions{PopupTest: true, FindPanel: true})

		widgets = append(widgets, editor)

		widgets = append(widgets, NewButtonLabelWidget(mgl64.Vec2{640, 400}, "Previous", nil))

		//widgets = append(widgets, NewFolderListingWidget(mgl64.Vec2{350, 30}, "../../../")) // Hopefully the "$GOPATH/src/" folder

	case 1:

		var windowSize0, windowSize1 int
		if window != nil {
			windowSize0, windowSize1 = window.GetSize()
		}
		windowSize := mgl64.Vec2{float64(windowSize0), float64(windowSize1)} // HACK: This is not updated as window resizes, etc.
		_ = windowSize

		goPackageListing := NewGoPackageListingWidget(mgl64.Vec2{0, 200}, mgl64.Vec2{200, 500 - fontHeight - 2})
		widgets = append(widgets, goPackageListing)

		localFs := vfs.OS("/")

		folderListing := NewVfsListingWidget(np, localFs, "/")
		widgets = append(widgets, NewScrollPaneWidget(mgl64.Vec2{0, 200 + 500 + 2}, mgl64.Vec2{200, float64(windowSize1 - 702 - 2)}, folderListing))

		// TEST, HACK: Open the folder listing to the folder of the Go package
		/*folderListingDirChanger := DepNode2Func{}
		folderListingDirChanger.UpdateFunc = func(this DepNode2I) {
			if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
				path := goPackage.Bpkg.Dir
				folderListing.flow.SetWidgets([]Widgeter{newVfsListingPureWidgetWithSelection(localFs, path)})
				//ExternallyUpdated(folderListing)
			}
		}
		folderListingDirChanger.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})
		keepUpdatedTEST = append(keepUpdatedTEST, &folderListingDirChanger)*/
		goPackageListing.listWidget.SelectionChangedPost = func() {
			if goPackage := goPackageListing.OnSelectionChanged().GetSelected().(*GoPackage); goPackage != nil {
				path := goPackage.Bpkg.Dir
				folderListing.flow.SetWidgets([]Widgeter{newVfsListingPureWidgetWithSelection(onlyGoFiles{FileSystem: localFs}, path)})
				//ExternallyUpdated(folderListing)
			}
		}

		// Main editor
		editorContent := multilinecontent.New()
		editorFileOpener := NewFileOpener(editorContent)
		editorFileOpener.AddSources(folderListing, &GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})
		keepUpdatedTEST = append(keepUpdatedTEST, editorFileOpener)
		editor := NewTextBoxWidgetExternalContent(np, editorContent, &TextBoxWidgetOptions{PopupTest: true, FindPanel: true})
		widgets = append(widgets, NewScrollPaneWidget(mgl64.Vec2{200 + 2, 0}, mgl64.Vec2{750, float64(windowSize1 - 200 - 4)}, editor))

		// HACK: Force Go highlighting for main editor. There should be a better way to set a content type and set highlighter based on that.
		{
			highlightedGoContent := &highlightedGoContent{}
			highlightedGoContent.AddSources(editorContent)
			editor.HighlightersTest = append(editor.HighlightersTest, highlightedGoContent)
		}

		// TODO: This should be at the canvas-scope rather than editor-scope, I think.
		selectPackageListing := &CustomWidget{
			Widget: NewWidget(np, np),
			ProcessEventFunc: func(inputEvent InputEvent) {
				if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
					switch glfw.Key(inputEvent.InputId) {
					case glfw.KeyO:
						if inputEvent.ModifierKey&glfw.ModSuper != 0 {
							goPackageListing.SetKeyboardFocus()
							goPackageListing.searchField.caretPosition.SelectAll() // HACK: Using many private fields.
						}
					}
				}
			},
		}
		editor.ExtensionsTest = append(editor.ExtensionsTest, selectPackageListing)

		// TODO: This should be at the canvas-scope rather than editor-scope, I think.
		selectFolderListing := &CustomWidget{
			Widget: NewWidget(np, np),
			ProcessEventFunc: func(inputEvent InputEvent) {
				if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
					switch glfw.Key(inputEvent.InputId) {
					case glfw.KeyT:
						if inputEvent.ModifierKey&glfw.ModSuper != 0 {
							folderListing.SetKeyboardFocus()
						}
					}
				}
			},
		}
		editor.ExtensionsTest = append(editor.ExtensionsTest, selectFolderListing)

		focusEditor := &CustomWidget{
			Widget: NewWidget(np, np),
			ProcessEventFunc: func(inputEvent InputEvent) {
				if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
					switch glfw.Key(inputEvent.InputId) {
					case glfw.KeyEnter:
						editor.caretPosition.Move(-3)

						// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
						keyboardPointer.OriginMapping = []Widgeter{editor}
					case glfw.KeyEscape:
						// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
						keyboardPointer.OriginMapping = []Widgeter{editor}
					}
				}
			},
		}
		goPackageListing.ExtensionsTest = append(goPackageListing.ExtensionsTest, focusEditor)
		folderListing.ExtensionsTest = append(folderListing.ExtensionsTest, focusEditor)

		// Output box.
		{
			//output := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{FindPanel: true})
			output := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{})
			scrollPane := NewScrollPaneWidget(mgl64.Vec2{200 + 2, float64(windowSize1 - 200 - 2)}, mgl64.Vec2{750, 200}, output)
			widgets = append(widgets, scrollPane)

			// HACK: These should go elsewhere rather than be declared ad-hoc.
			var this = struct {
				p            PipeFactory
				s            *pipe.State
				stdoutChan   ChanWriter
				stderrChan   ChanWriter
				finishedChan chan error
			}{finishedChan: make(chan error)}

			{
				// go run.
				template3 := NewPipeTemplateDynamic()
				template3.UpdateFunc = func(this DepNode2I) {
					template3.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "Nothing to go run."))

					if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
						template3.Template = NewPipeTemplate(pipe.Script(
							pipe.Println(fmt.Sprintf("Building %q.", goPackage.Bpkg.ImportPath)),
							pipe.Line(
								pipeutil.ExecCombinedOutput("go", "build", "-o", con2RunBinPath, goPackage.Bpkg.ImportPath),
								pipe.TaskFunc(func(s *pipe.State) error {
									var b bytes.Buffer
									io.Copy(&b, s.Stdin)
									goCompileErrorsTest.Dir = goPackage.Bpkg.Dir
									SetViewGroup(buildOutput, b.String())
									io.Copy(s.Stdout, &b)
									return nil
								}),
							),
							pipe.Println("Running."),
							pipe.Exec(con2RunBinPath),
							pipe.Println("Done."),
						))
						template3.Template.Dir = goPackage.Bpkg.Dir
					}
				}
				template3.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

				this.p = template3
			}

			buildAndRun := &CustomWidget{
				Widget: NewWidget(np, np),
				ProcessEventFunc: func(inputEvent InputEvent) {
					if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
						switch glfw.Key(inputEvent.InputId) {
						case glfw.KeyB:
							if inputEvent.ModifierKey == glfw.ModSuper {
								// Stop previous process.
								if this.s != nil {
									this.s.Kill()
									this.s = nil
								}

								// Clear.
								SetViewGroup(output.Content, "")
								SetViewGroup(buildOutput, "")

								this.stdoutChan = make(ChanWriter)
								this.stderrChan = make(ChanWriter)
								var p pipe.Pipe
								this.s, p = this.p.NewPipe(this.stdoutChan, this.stderrChan)

								go func(s *pipe.State, p pipe.Pipe) {
									err := p(s)
									if err == nil {
										err = this.s.RunTasks()
									}
									//close(this.w.stdoutChan) // This is causing panics because pipe tries to write to closed channel.
									//close(this.w.stderrChan)
									this.finishedChan <- err
								}(this.s, p)
							}
						case glfw.KeyC:
							if inputEvent.ModifierKey == glfw.ModControl {
								// Stop previous process.
								if this.s != nil {
									this.s.Kill()
									this.s = nil
								}

								SetViewGroup(output.Content, output.Content.Content()+"^C\n")
							}
						case glfw.KeyL:
							if inputEvent.ModifierKey == glfw.ModControl {
								// Clear.
								SetViewGroup(output.Content, "")
								SetViewGroup(buildOutput, "")
							}
						}
					}
				},
				CloseFunc: func() error {
					// Stop previous process.
					if this.s != nil {
						this.s.Kill()
						this.s = nil
					}

					return nil
				},
				PollLogicFunc: func(_ *CustomWidget) {
					select {
					case b, ok := <-this.stdoutChan:
						if ok {
							SetViewGroup(output.Content, output.Content.Content()+string(b))
							scrollPane.ScrollToBottom() // TEST
							redraw = true
						}
					default:
					}

					select {
					case b, ok := <-this.stderrChan:
						if ok {
							SetViewGroup(output.Content, output.Content.Content()+string(b))
							scrollPane.ScrollToBottom() // TEST
							redraw = true
						}
					default:
					}

					select {
					/*case processState := <-w.finishedChan:
					if processState.Success() {
						// TODO: Is ChangeListener stuff a good fit for these not-really-change events?
						w.SuccessDepNode.NotifyAllListeners()
					}*/
					case <-this.finishedChan:
						//ExternallyUpdated(w)
					default:
					}
				},
			}
			editor.ExtensionsTest = append(editor.ExtensionsTest, buildAndRun)

			if keyboardPointer != nil {
				// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
				keyboardPointer.OriginMapping = []Widgeter{editor}
			}
		}

		// View sidebar
		{
			// git diff (file).
			var gitDiffFileCollapsible Widgeter
			{
				template := NewPipeTemplateDynamic()
				template.UpdateFunc = func(this DepNode2I) {
					template.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "No git diff available."))

					goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage()
					if goPackage == nil {
						return
					}

					path := this.GetSources()[1].(*VfsListingWidget).GetSelectedPath()
					if path == "" || !strings.HasSuffix(path, ".go") {
						return
					}

					dir, file := filepath.Split(path)
					if goPackage.Dir.Repo == nil || goPackage.Dir.Repo.Vcs.Type() != legacyvcs.Git {
						return
					}

					template.Template = NewPipeTemplate(pipe.Line(
						// TODO: Reuse u6.GoPackageWorkingDiff.
						pipe.Exec("git", "diff", "--no-ext-diff", "--", file),
						pipe.TaskFunc(func(s *pipe.State) error {
							r := bufio.NewReader(s.Stdin)
							for range iter.N(4) {
								r.ReadBytes('\n')
							}
							var b bytes.Buffer
							io.Copy(&b, r)
							if b.Len() == 0 {
								return nil
							}
							b.Truncate(b.Len() - 1)
							io.Copy(s.Stdout, &b)
							return nil
						}),
					))
					template.Template.Dir = dir
				}
				template.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, folderListing)

				gitDiffFile := NewLivePipeExpeWidget(np, []DepNode2I{editorContent}, template) // TODO: Are both editorContent and folderListing deps needed? Or is editorContent enough, since it probably depends on folderListing, etc.

				diffHighlighter := &diffHighlighter{}
				diffHighlighter.AddSources(gitDiffFile.Content)
				gitDiffFile.HighlightersTest = append(gitDiffFile.HighlightersTest, diffHighlighter)
				gitDiffFile.LineHighlighter = diffHighlighter

				gitDiffFileCollapsible = NewCollapsibleWidget(np, gitDiffFile, "git diff (file)")
			}

			// ---

			var gitDiffCollapsible Widgeter
			{
				// git diff (package).
				gitDiffStringer := &DepStringerFunc{}
				gitDiffStringer.UpdateFunc = func(this DepNode2I) {
					gitDiffStringer.content = "No git diff available."

					goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage()
					if goPackage == nil {
						return
					}

					MakeUpdatedLock.Unlock() // HACK: Needed because UpdateVcs() calls MakeUpdated().
					goPackage.UpdateVcs()
					MakeUpdatedLock.Lock() // HACK
					if goPackage.Dir.Repo == nil {
						return
					}

					MakeUpdatedLock.Unlock() // HACK: Needed because we're calling MakeUpdated() directly.
					MakeUpdated(goPackage.Dir.Repo.VcsLocal)
					MakeUpdatedLock.Lock() // HACK
					gitDiffStringer.content = u6.GoPackageWorkingDiff(goPackage)
					redraw = true
				}
				gitDiffStringer.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, editorContent, windowFocusedEvent)

				// TODO: This needs to be refactored to use more modern DepNode2I, which will make this simpler and reduce duplication.
				gitDiff := NewTextBoxWidgetExternalContent(np, NewMultilineContentFunc(func() string { return gitDiffStringer.String() }, []DepNodeI{&UniversalClock}), nil)
				gitDiff.DepsTest = append(gitDiff.DepsTest, gitDiffStringer)

				diffHighlighter := &diffHighlighter{}
				diffHighlighter.AddSources(gitDiff.Content)
				gitDiff.HighlightersTest = append(gitDiff.HighlightersTest, diffHighlighter)
				gitDiff.LineHighlighter = diffHighlighter

				gitDiffCollapsible = NewCollapsibleWidget(np, gitDiff, "git diff")
			}

			// ---

			var gitDiffAgainstMasterCollapsible Widgeter
			{
				// git diff against master.
				gitDiffStringer := &DepStringerFunc{}
				gitDiffStringer.UpdateFunc = func(this DepNode2I) {
					gitDiffStringer.content = "No git diff available."

					goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage()
					if goPackage == nil {
						return
					}

					MakeUpdatedLock.Unlock() // HACK: Needed because UpdateVcs() calls MakeUpdated().
					goPackage.UpdateVcs()
					MakeUpdatedLock.Lock() // HACK
					if goPackage.Dir.Repo == nil {
						return
					}

					MakeUpdatedLock.Unlock() // HACK: Needed because we're calling MakeUpdated() directly.
					MakeUpdated(goPackage.Dir.Repo.VcsLocal)
					MakeUpdatedLock.Lock() // HACK
					gitDiffStringer.content = u6.GoPackageWorkingDiffMaster(goPackage)
					redraw = true
				}
				gitDiffStringer.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, editorContent, windowFocusedEvent)

				// TODO: This needs to be refactored to use more modern DepNode2I, which will make this simpler and reduce duplication.
				gitDiff := NewTextBoxWidgetExternalContent(np, NewMultilineContentFunc(func() string { return gitDiffStringer.String() }, []DepNodeI{&UniversalClock}), nil)
				gitDiff.DepsTest = append(gitDiff.DepsTest, gitDiffStringer)

				diffHighlighter := &diffHighlighter{}
				diffHighlighter.AddSources(gitDiff.Content)
				gitDiff.HighlightersTest = append(gitDiff.HighlightersTest, diffHighlighter)
				gitDiff.LineHighlighter = diffHighlighter

				gitDiffAgainstMasterCollapsible = NewCollapsibleWidget(np, gitDiff, "git diff against master")
			}

			// ---

			// git show HEAD.
			var nextTool10Collapsible *CollapsibleWidget
			{
				template := NewPipeTemplateDynamic()
				template.UpdateFunc = func(this DepNode2I) {
					template.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "No luck."))

					goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage()
					if goPackage == nil {
						return
					}

					path := this.GetSources()[1].(*VfsListingWidget).GetSelectedPath()
					if path == "" || !strings.HasSuffix(path, ".go") {
						return
					}

					dir, file := filepath.Split(path)
					if goPackage.Dir.Repo == nil || goPackage.Dir.Repo.Vcs.Type() != legacyvcs.Git {
						return
					}

					template.Template = NewPipeTemplate(pipe.Line(
						pipe.Exec("git", "show", "HEAD:./"+file),
					))
					template.Template.Dir = dir

				}
				template.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, folderListing)

				gitHead := NewLivePipeExpeWidget(np, []DepNode2I{folderListing}, template)
				nextTool10Collapsible = NewCollapsibleWidget(np, gitHead, "git show HEAD")

				{
					box1 := gitHead
					box2 := editor
					stateFunc := func() bool { return nextTool10Collapsible.state.State() } // This should only be visible when "git show HEAD" is expanded.

					if false {
						highlightedDiff := &highlightedDiff{}
						highlightedDiff.AddSources(box1.Content, box2.Content)

						box1.DynamicHighlighters = append(box1.DynamicHighlighters, NewOptionalHighlighter(&highlightedDiffSide{highlightedDiff: highlightedDiff, side: 0}, stateFunc))
						box2.DynamicHighlighters = append(box2.DynamicHighlighters, NewOptionalHighlighter(&highlightedDiffSide{highlightedDiff: highlightedDiff, side: 1}, stateFunc))
					} else {
						lineDiff := &lineDiff{}
						lineDiff.AddSources(box1.Content, box2.Content)

						lineDiffSide0 := &lineDiffSide{lineDiff: lineDiff, side: 0}
						lineDiffSide1 := &lineDiffSide{lineDiff: lineDiff, side: 1}

						box1.DynamicHighlighters = append(box1.DynamicHighlighters, NewOptionalHighlighter(lineDiffSide0, stateFunc))
						box2.DynamicHighlighters = append(box2.DynamicHighlighters, NewOptionalHighlighter(lineDiffSide1, stateFunc))

						box1.DynamicLineHighlighter = func() LineHighlighter {
							if !stateFunc() {
								return nil
							}
							return lineDiffSide0
						}
						box2.DynamicLineHighlighter = func() LineHighlighter {
							if !stateFunc() {
								return nil
							}
							return lineDiffSide1
						}
					}
				}
			}

			// ---

			// Local Branch of selected GoPackage
			localBranch := &DepStringerFunc{}
			localBranch.UpdateFunc = func(this DepNode2I) {
				localBranch.content = ""
				if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
					MakeUpdatedLock.Unlock() // HACK: Needed because UpdateVcs() calls MakeUpdated().
					goPackage.UpdateVcs()
					MakeUpdatedLock.Lock() // HACK
					if goPackage.Dir.Repo != nil {
						MakeUpdatedLock.Unlock() // HACK: Needed because we're calling MakeUpdated() directly.
						MakeUpdated(goPackage.Dir.Repo.VcsLocal)
						MakeUpdatedLock.Lock() // HACK
						localBranch.content = goPackage.Dir.Repo.VcsLocal.LocalBranch
					}
				}
			}
			localBranch.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

			nextTool := NewStringerWidget(np, localBranch)
			nextToolCollapsible := NewCollapsibleWidget(np, nextTool, "Local Branch")

			// ---

			// Build Output.
			buildOutput = multilinecontent.New()
			nextTool9Collapsible := NewCollapsibleWidget(np, NewTextBoxWidgetExternalContent(np, buildOutput, nil), "Build Output")

			// Go Compile Errors hardcoded TEST
			{
				goCompileErrorsTest = GoCompileErrorsTest{}
				goCompileErrorsTest.AddSources(buildOutput)
				goCompileErrorsManagerTest.AddSources(&goCompileErrorsTest)
			}

			// ---

			// go build.
			template2 := NewPipeTemplateDynamic()
			template2.UpdateFunc = func(this DepNode2I) {
				template2.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "Nothing to go build."))

				if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
					template2.Template = NewPipeTemplate(pipe.Line(
						pipeutil.ExecCombinedOutput("go", "build", "-o", "/dev/null", goPackage.Bpkg.ImportPath),
						pipe.TaskFunc(func(s *pipe.State) error {
							var b bytes.Buffer
							io.Copy(&b, s.Stdin)
							goCompileErrorsTest.Dir = ""
							SetViewGroup(buildOutput, b.String())
							io.Copy(s.Stdout, &b)
							return nil
						}),
					))
					//template2.Template.Dir = ""
				}
			}
			template2.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

			build := NewLivePipeExpeWidget(np, []DepNode2I{editorContent}, template2)
			nextTool2Collapsible := NewCollapsibleWidget(np, build, "go build")

			// ---

			// go run.
			template3 := NewPipeTemplateDynamic()
			template3.UpdateFunc = func(this DepNode2I) {
				template3.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "Nothing to go run."))

				if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
					template3.Template = NewPipeTemplate(pipe.Script(
						pipe.Println(fmt.Sprintf("Building %q.", goPackage.Bpkg.ImportPath)),
						pipe.Line(
							pipeutil.ExecCombinedOutput("go", "build", "-o", con2RunBinPath, goPackage.Bpkg.ImportPath),
							pipe.TaskFunc(func(s *pipe.State) error {
								var b bytes.Buffer
								io.Copy(&b, s.Stdin)
								goCompileErrorsTest.Dir = goPackage.Bpkg.Dir
								SetViewGroup(buildOutput, b.String())
								io.Copy(s.Stdout, &b)
								return nil
							}),
						),
						pipe.Println("Running."),
						pipe.Exec(con2RunBinPath),
						pipe.Println("Done."),
					))
					template3.Template.Dir = goPackage.Bpkg.Dir
				}
			}
			template3.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

			run := NewLivePipeExpeWidget(np, []DepNode2I{editorContent}, template3)
			nextTool2bCollapsible := NewCollapsibleWidget(np, run, "go run")

			// ---

			// go test.
			template4 := NewPipeTemplateDynamic()
			template4.UpdateFunc = func(this DepNode2I) {
				template4.Template = NewPipeTemplate(pipe.Exec("echo", "-n", "Nothing to go test."))
				if goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage(); goPackage != nil {
					template4.Template = NewPipeTemplate(pipe.Script(
						pipeutil.ExecCombinedOutput("go", "test", goPackage.Bpkg.ImportPath),
					))
				}
			}
			template4.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

			goTest := NewLivePipeExpeWidget(np, []DepNode2I{editorContent}, template4)
			nextTool2cCollapsible := NewCollapsibleWidget(np, goTest, "go test")

			// ---

			nextTool3, typeCheckedPackage := NewTest4Widget(np, &GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, editor)
			nextTool3Collapsible := NewCollapsibleWidget(np, nextTool3, "typeCheckedPackage verbose")

			typeUnderCaretWidget := NewTypeUnderCaretWidget(np, &GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, editor, typeCheckedPackage)
			nextTool3bCollapsible := NewCollapsibleWidget(np, typeUnderCaretWidget, "Type")

			// ---

			// DEBUG: Goon widget of typeCheckedPackage
			nextTool4 := NewGoonWidget(np, &typeCheckedPackage)
			nextTool4Collapsible := NewCollapsibleWidget(np, nextTool4, "goon of typeCheckedPackage")

			// TEST: Add goto declaration extension to editor
			{
				gotoDecl := &CustomWidget{
					Widget: NewWidget(np, np),
					ProcessEventFunc: func(inputEvent InputEvent) {
						if inputEvent.Pointer.VirtualCategory == event.Typing && inputEvent.EventTypes[event.ButtonEvent] && inputEvent.Buttons[0] == true {
							switch glfw.Key(inputEvent.InputId) {
							case glfw.KeyDown:
								if inputEvent.ModifierKey == glfw.ModSuper|glfw.ModAlt {
									if Test4WidgetIdent != nil && typeCheckedPackage.info != nil {
										if obj := typeCheckedPackage.info.Uses[Test4WidgetIdent]; obj != nil {
											if file := typeCheckedPackage.fset.File(obj.Pos()); file != nil {
												// TODO: Change folderListing selection if it's in a different file

												editor.caretPosition.TrySet(uint32(file.Offset(obj.Pos())))
												editor.CenterOnCaretPosition()
											}
										}
									}
								}
							}
						}
					},
				}
				editor.ExtensionsTest = append(editor.ExtensionsTest, gotoDecl)
			}

			// ---

			// Parse current file and extract symbols for Cmd+R go to symbol functionality.
			{
				parsedFile := &parsedFile{}
				parsedFile.AddSources(editorContent)

				globalParsedFile = parsedFile

				goSymbols := &goSymbolsC{}
				goSymbols.AddSources(parsedFile)

				globalGoSymbols = goSymbols
			}

			// ---

			nextTool6 := NewTest6OracleWidget(np, &GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()}, editor)
			nextTool6Collapsible := NewCollapsibleWidget(np, nextTool6, "Oracle Tool")

			// ---

			godocOrgImporters := &DepStringerFunc{}
			godocOrgImporters.UpdateFunc = func(this DepNode2I) {
				goPackage := this.GetSources()[0].(GoPackageSelecter).GetSelectedGoPackage()
				if goPackage == nil {
					godocOrgImporters.content = ""
					return
				}
				importers, err := gddoClient.GetImporters(goPackage.Bpkg.ImportPath)
				if err != nil {
					godocOrgImporters.content = err.Error()
					return
				}
				var buf bytes.Buffer
				w := tabwriter.NewWriter(&buf, 0, 0, 2, ' ', 0)
				for _, i := range importers.Results {
					fmt.Fprintf(w, "%s\t%s\n", i.Path, i.Synopsis)
				}
				w.Flush()
				if len(importers.Results) == 0 {
					fmt.Fprintln(&buf, "(No importers.)")
				}
				godocOrgImporters.content = buf.String()
			}
			godocOrgImporters.AddSources(&GoPackageSelecterAdapter{goPackageListing.OnSelectionChanged()})

			// TODO: This needs to be refactored to use more modern DepNode2I, which will make this simpler and reduce duplication.
			nextTool7 := NewTextBoxWidgetExternalContent(np, NewMultilineContentFunc(func() string { return godocOrgImporters.String() }, []DepNodeI{&UniversalClock}), nil)
			nextTool7.DepsTest = append(nextTool7.DepsTest, godocOrgImporters)
			nextTool7Collapsible := NewCollapsibleWidget(np, nextTool7, "godoc.org Importers")

			// ---

			caretPositionStringer := &DepStringerFunc{}
			caretPositionStringer.UpdateFunc = func(this DepNode2I) {
				caretPosition := this.GetSources()[0].(*caret.CaretPosition)
				caretPositionStringer.content = fmt.Sprintf("Line: %v, Caret Position: %v", caretPosition.LineNumber(), caretPosition.Logical())
				if caretPosition.AnySelection() {
					start, end := caretPosition.SelectionRange()
					caretPositionStringer.content += fmt.Sprintf(", %d characters selected", end-start)
				}
			}
			caretPositionStringer.AddSources(editor.caretPosition)

			nextTool8 := NewStringerWidget(np, caretPositionStringer)

			// =====

			tools := NewFlowLayoutWidget(np, []Widgeter{nextTool8, nextTool9Collapsible, nextTool2Collapsible, nextTool2bCollapsible, nextTool2cCollapsible, nextToolCollapsible, gitDiffFileCollapsible, gitDiffCollapsible, gitDiffAgainstMasterCollapsible, nextTool10Collapsible, nextTool3bCollapsible, nextTool3Collapsible, nextTool4Collapsible, nextTool6Collapsible, nextTool7Collapsible}, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout})
			widgets = append(widgets, NewScrollPaneWidget(mgl64.Vec2{950 + 4, 0}, mgl64.Vec2{580, float64(windowSize1 - 2)}, tools))
		}

	case -999: // Deleted test widget instances
		{
			src := NewTextFileWidget(np, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/gist.github.com/7176504.git/main.go")
			//src := NewTextFileWidget(mathgl.Vec2d{}, "./GoLand/src/simple.go")
			//src := NewTextFileWidget(mathgl.Vec2d{}, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/gist.github.com/5694308.git/main.go")
			//src := NewTextFileWidget(mathgl.Vec2d{0, 0}, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/gist.github.com/5068062.git/gistfile1.go")
			//src := NewTextBoxWidget(mathgl.Vec2d{50, 200})

			build := NewLiveCmdExpeWidget(np, []DepNode2I{src.Content}, NewCmdTemplate("go", "build", "-o", "./Con2RunBin", "gist.github.com/7176504.git" /*src.Path()*/)) // TODO: Do this right
			spinner.AddSources(build)

			// Go Compile Errors hardcoded TEST
			{
				goCompileErrorsTest := GoCompileErrorsTest{}
				//goCompileErrorsTest.Source = build.Content
				//build.AddChangeListener(&goCompileErrorsTest)
				goCompileErrorsTest.AddSources(build)
				//goCompileErrorsManagerTest.Sources = append(goCompileErrorsManagerTest.Sources, &goCompileErrorsTest) // TODO: This should call the next line, etc.
				//goCompileErrorsTest.AddChangeListener(&goCompileErrorsManagerTest)
				goCompileErrorsManagerTest.AddSources(&goCompileErrorsTest)
			}

			run := NewLiveCmdExpeWidget(np, []DepNode2I{build}, NewCmdTemplate("./Con2RunBin")) // TODO: Proper path

			widgets = append(widgets, NewFlowLayoutWidget(mgl64.Vec2{50, 200}, []Widgeter{src, build, run}, nil))
		}

		// DEBUG: Testing out new DepNode2 system
		{
			// TODO: Use DepNode2 so that if this is false, then goCompileErrorsManagerTest.All (and goCompileErrorsTest also) shouldn't get updated
			goCompileErrorsEnabled := true
			goCompileErrorsEnabledTest := NewTriButtonExternalStateWidget(mgl64.Vec2{500, 700}, func() bool { return goCompileErrorsEnabled }, func() { goCompileErrorsEnabled = !goCompileErrorsEnabled })
			widgets = append(widgets, goCompileErrorsEnabledTest)

			//widgets = append(widgets, NewTextLabelWidgetGoon(mathgl.Vec2d{500, 716 + 2}, &goCompileErrorsManagerTest.DepNode2.NeedToUpdate))
			widgets = append(widgets, NewTextLabelWidgetGoon(mgl64.Vec2{500, 732 + 4}, &goCompileErrorsManagerTest.All))
		}

		widgets = append(widgets, &BoxWidget{NewWidget(mgl64.Vec2{50, 150}, mgl64.Vec2{16, 16}), "The Original Box"})
		widgets = append(widgets, NewCompositeWidget(mgl64.Vec2{150, 150},
			[]Widgeter{
				&BoxWidget{NewWidget(mgl64.Vec2{0, 0}, mgl64.Vec2{16, 16}), "Left of Duo"},
				&BoxWidget{NewWidget(mgl64.Vec2{16 + 2, 0}, mgl64.Vec2{16, 16}), "Right of Duo"},
			}))
		widgets = append(widgets, &UnderscoreSepToCamelCaseWidget{NewWidget(mgl64.Vec2{50, 180}, mgl64.Vec2{0, 0}), window})
		widgets = append(widgets, NewChannelExpeWidget(mgl64.Vec2{10, 220}))
		widgets = append(widgets, NewTextBoxWidget(mgl64.Vec2{50, 5}))
		widgets = append(widgets, NewTextFileWidget(mgl64.Vec2{90, 25}, "/Users/Dmitri/Dropbox/Needs Processing/Sample.txt"))
		widgets = append(widgets, NewTextBoxWidgetExternalContent(mgl64.Vec2{90, 60}, widgets[len(widgets)-1].(*TextFileWidget).TextBoxWidget.Content, nil)) // HACK: Manual test
		widgets = append(widgets, NewTextLabelWidgetExternalContent(mgl64.Vec2{90, 95}, widgets[len(widgets)-2].(*TextFileWidget).TextBoxWidget.Content))    // HACK: Manual test

		widgets = append(widgets, NewTest2Widget(mgl64.Vec2{240, 5}, &widgets[7].(*TextBoxWidget).pos[0]))
		widgets = append(widgets, NewTest1Widget(mgl64.Vec2{10, 50}))

		type Inner struct {
			Field1 string
			Field2 int
		}
		type Lang struct {
			Name  string
			Year  int
			URLs  [2]string
			Inner Inner
		}
		x := Lang{
			Name: "Go",
			Year: 2009,
			URLs: [2]string{"http", "https"},
			Inner: Inner{
				Field1: "Secret!",
				Field2: 123367,
			},
		}

		/*Lang{
			Name: "Go",
			Year: 2009,
			URL:  "http",
			Inner: Inner{...},
		}*/

		//widgets = append(widgets, NewGoonWidget(mathgl.Vec2d{260, 130}, FlowLayoutWidget{}))
		//widgets = append(widgets, NewGoonWidget(mathgl.Vec2d{260, 130}, InputEvent{}))
		widgets = append(widgets, NewGoonWidget(mgl64.Vec2{380, 10}, &x))
		y := NewWidget(mgl64.Vec2{1, 2}, mgl64.Vec2{3})
		widgets = append(widgets, NewGoonWidget(mgl64.Vec2{600, 10}, &y))
	case 0:
		widgets = append(widgets, &spinner)

		katWidget := NewKatWidget(mgl64.Vec2{370, 15})
		widgets = append(widgets, katWidget)
		if katOnly {
			// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
			keyboardPointer.OriginMapping = []Widgeter{katWidget}
		}

		// GoForcedUseWidget
		{
			src := NewTextBoxWidget(np)
			label := NewTextLabelWidgetString(np, "go Forced Use")

			params := func() interface{} { return src.Content.Content() }
			action := func(params interface{}) string {
				if strings.TrimSpace(params.(string)) != "" {
					//started := time.Now(); defer func() { fmt.Println(time.Since(started).Seconds()) }()
					return gist4727543.GetForcedUseFromImport(strings.TrimSpace(src.Content.Content()))
				} else {
					return ""
				}
			}
			dst := NewLiveGoroutineExpeWidget(np, true, []DepNode2I{src.Content}, params, action)

			w := NewFlowLayoutWidget(mgl64.Vec2{80, 130}, []Widgeter{src, label, dst}, nil)
			widgets = append(widgets, w)
		}
		// GoForcedUseWidget2
		{
			src := NewTextBoxWidget(np)
			label := NewTextLabelWidgetString(np, "go Forced Use")

			params := func() interface{} { return src.Content.Content() }
			action := func(params interface{}) string {
				if strings.TrimSpace(params.(string)) != "" {
					//started := time.Now(); defer func() { fmt.Println(time.Since(started).Seconds()) }()
					cmd := exec.Command("goe", "--quiet", "b, _ := ioutil.ReadAll(os.Stdin); fmt.Print(gist4727543.GetForcedUseFromImport(string(b)))")
					//cmd := exec.Command("cat")
					cmd.Stdin = strings.NewReader(strings.TrimSpace(src.Content.Content()))
					out, err := cmd.CombinedOutput()
					if err != nil {
						panic(err)
					}
					return string(out)
				} else {
					return ""
				}
			}
			dst := NewLiveGoroutineExpeWidget(np, true, []DepNode2I{src.Content}, params, action)

			w := NewFlowLayoutWidget(mgl64.Vec2{80, 150}, []Widgeter{src, label, dst}, nil)
			widgets = append(widgets, w)
		}

		//widgets = append(widgets, NewFolderListingWidget(mgl64.Vec2{350, 30}, "../../../")) // Hopefully the "$GOPATH/src/" folder

		//widgets = append(widgets, NewCompositeWidget(mathgl.Vec2d{160, 30}, []Widgeter{NewGoPackageListingPureWidget()}))

		contentWs := multilinecontent.New()
		widgets = append(widgets, NewTextBoxWidgetExternalContent(mgl64.Vec2{800 - 50, 30}, contentWs, nil))
		http.HandleFunc("/websocket", func(w http.ResponseWriter, req *http.Request) {
			io.WriteString(w, `<html>
	<body>
		<script type="text/javascript">
			var prev_value = "";
			var input_field = null;
			function liveUpdateTest() {
				try {
					if (input_field.value != prev_value) {
						sock.send(input_field.value + "\0");
						prev_value = input_field.value;
					}
				} catch (exc) {
					document.getElementById("myLiveOut").textContent = "sock.send Error: " + exc;
				}
			}

			var sock = new WebSocket("ws://" + window.location.host + "/websocket.ws");
			//sock.addEventListener('open', function(e2) { sock.send( ... ) });
			sock.onopen = function(evt) {
				document.getElementById("myLiveOut").textContent = "Connected.";
				input_field = document.getElementById("inputField");
				input_field.addEventListener('input', liveUpdateTest);
				//input_field.select();
				//liveUpdateTest();
				console.log("Open: ", evt);
			};
			sock.onclose = function(evt) {
				document.getElementById("myLiveOut").textContent = "Disconnected.";
				console.log("Close: ", evt);
			};
			sock.onmessage = function(evt) {
				prev_value = evt.data;
				document.getElementById("inputField").value = evt.data;
				//console.log("Message: ", evt.data);
			};
			sock.onerror = function(evt) {
				document.getElementById("myLiveOut").textContent += " Error: " + evt;
				console.log("Error: ", evt);
			};
		</script>

		<textarea id="inputField" placeholder="type something..." autofocus></textarea>
		<br><br>
		<div id="myLiveOut">Connecting...</div>
	</body>
</html>`)
		})
		http.Handle("/websocket.ws", websocket.Handler(func(c *websocket.Conn) {
			wsView := NewWebSocketView(c)

			contentWs.AddAndSetViewGroup(wsView, contentWs.Content()) // TODO: Fix race condition

			br := bufio.NewReader(c)
			for {
				line, err := br.ReadString('\x00')
				if err == nil {
					wsView.WsReadChan <- line[:len(line)-1] // Trim delimiter
				} else {
					//wsView.WsReadChan <- line
					//close(wsView.WsReadChan)
					break
				}
			}

			contentWs.RemoveView(wsView) // TODO: Fix race condition
		}))

		// WebSocket Touch Pointer.
		http.HandleFunc("/websocket2", func(w http.ResponseWriter, req *http.Request) {
			io.WriteString(w, `<html>
	<head>
		<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
		<style>
			body {
				margin: 0px;
			}
			canvas {
				background-color: #111133;
				display: block;
				position: absolute;
			}
			.container {
				width: auto;
				text-align: center;
				background-color: #ff0000;
			}
		</style>
	</head>
	<body>
		<script>
			var canvas, c, container;

			var mouseX, mouseY;
			var touchable = "ontouchstart" in window; // is this running in a touch capable environment?
			var touches = []; // array of touch vectors

			function orientationchange() {
				// Hack to work around lack of orientationchange/resize event
				if (   canvas.width == window.innerWidth
					|| canvas.height == window.innerHeight) {
					alert("orientationchange called but nothing changed??!");
				}

				canvas.width = window.innerWidth;
				canvas.height = window.innerHeight;
			}

			var lastUpdate = new Date, fps = "fps: ", framesDrawn = 0;

			function loop() {
				window.requestAnimationFrame(loop);

				try {
					//sock.send(JSON.stringify(touches.length) + "\n");		// HACK: Should make sure that sock.onopen has happened before calling send...
					if (touches.length >= 1) {
						var deltaX = touches[0].clientX - lastTouchX;
						var deltaY = touches[0].clientY - lastTouchY;
						sock.send(deltaX + " " + deltaY + "\0");
						lastTouchX = touches[0].clientX;
						lastTouchY = touches[0].clientY;
					}
				} catch (exc) {
					//alert("Error: " + exc);
				}

				c.clearRect(0, 0, canvas.width, canvas.height);
				c.strokeStyle = "cyan";
				c.lineWidth = "4";
				// Need to handle canvas offsetLeft/offsetTop once we have SD panel
				for (var i = 0, l = touches.length; i < l; i++) {
					c.beginPath();
					c.arc(touches[i].clientX, touches[i].clientY, 50, 0, Math.PI * 2, true);
					c.stroke();

					c.beginPath();
					c.fillStyle = "white";
					c.fillText("touch id : "+touches[i].identifier+" x:"+touches[i].clientX+" y:"+touches[i].clientY, touches[i].clientX+40, touches[i].clientY-40);
				}
				if (touches.length > 1) {
					c.beginPath();
					c.lineWidth = "2";
					c.moveTo(touches[0].clientX, touches[0].clientY);
					for(var i = 1, l = touches.length; i < l; i++) {
						c.lineTo(touches[i].clientX, touches[i].clientY);
					}
					c.stroke();
				}

				framesDrawn++;
				now = new Date;
				if ((now - lastUpdate) >= 100) {
					fps = "fps: " + (framesDrawn * 1000 / (now - lastUpdate)).toFixed(2);
					lastUpdate = now;
					framesDrawn = 0;
				}
				c.fillStyle = "white";
				c.fillText(fps, 0, 10);
			}

			function handleMouseMove(event) {
				mouseX = event.clientX;
				mouseY = event.clientY;

				touches = [ event ];
			}

			var lastTouchX, lastTouchY;
			function touchHandler(e) {
				e.preventDefault();
				if (touches.length == 0 && e.touches.length >= 1) {
					lastTouchX = e.touches[0].clientX;
					lastTouchY = e.touches[0].clientY;
				}
				touches = e.touches;
				//loop();
				//window.requestAnimationFrame(loop);
			}

			function init() {
				canvas = document.createElement("canvas");
				c = canvas.getContext("2d");
				container = document.createElement("div");
				container.className = "container";
				canvas.width = window.innerWidth;
				canvas.height = window.innerHeight;
				container.appendChild(canvas);
				document.body.appendChild(container);
				c.strokeStyle = "#ffffff";
				c.lineWidth = 2;

				if (touchable) {
					canvas.addEventListener("touchstart", touchHandler);
					canvas.addEventListener("touchmove", touchHandler);
					canvas.addEventListener("touchend", touchHandler);
					window.addEventListener("orientationchange", orientationchange);
					//setInterval(loop, 1000 / 35);
					loop();
				} else {
					//document.write("Not touchable.");
					canvas.addEventListener("mousemove", handleMouseMove);
					loop();
				}
			}

			window.addEventListener("load", function() {
				// Hack to prevent firing the init script before the window object's values are populated
				setTimeout(init, 100);
			});

			var sock = new WebSocket("ws://" + window.location.host + "/websocket2.ws");
			sock.onopen = function(evt) { console.log("Open: ", evt); };
			sock.onclose = function(evt) { console.log("Close: ", evt); };
			sock.onerror = function(evt) { console.log("Error: ", evt); };
		</script>
	</body>
</html>`)
		})
		http.Handle("/websocket2.ws", websocket.Handler(func(c *websocket.Conn) {
			websocketPointer = &Pointer{VirtualCategory: event.Pointing} // TODO: Fix race condition

			br := bufio.NewReader(c)
			for {
				line, err := br.ReadString('\x00')
				if err == nil {
					touchPositionString := line[:len(line)-1] // Trim delimiter
					var x, y float64
					fmt.Sscan(touchPositionString, &x, &y)

					var posX, posY float64
					if len(websocketPointer.State.Axes) >= 2 {
						posX = websocketPointer.State.Axes[0]
						posY = websocketPointer.State.Axes[1]
					}
					posX += x
					posY += y

					inputEvent := InputEvent{
						Pointer:    websocketPointer,
						EventTypes: map[event.EventType]bool{event.AxisEvent: true},
						InputId:    0,
						Buttons:    nil,
						Sliders:    []float64{x, y},
						Axes:       []float64{posX, posY},
					}
					inputEventQueue2 <- inputEvent
				} else {
					//wsView.WsReadChan <- line
					//close(wsView.WsReadChan)
					break
				}
			}

			websocketPointer = nil // TODO: Fix race condition
		}))

		// Shuryear Clock
		{
			contentFunc := func() string {
				shuryearNow := 1970 + float64(time.Now().UnixNano())/(3600*24*3652422*100000)
				return fmt.Sprintf("%.8f", shuryearNow)
			}
			mc := NewMultilineContentFunc(contentFunc, []DepNodeI{&UniversalClock})
			widgets = append(widgets, NewTextLabelWidgetExternalContent(mgl64.Vec2{1443, 0}, mc)) // TODO: Stick to top right corner?
		}

		{
			buttonTrigger := NewButtonTriggerWidget(mgl64.Vec2{50, 30})
			spinner.AddSources(buttonTrigger)
			widgets = append(widgets, buttonTrigger)
		}

		// `gofmt -r rule` experiment
		if false {
			in := NewTextBoxWidget(np)
			SetViewGroup(in.Content, `package main

import "bytes"

func main() {
	a := []byte("something")
	b := []byte("or other")

	if bytes.Compare(a, b) != 0 {
		println("Mismatch.")
	}
}
`)

			validFunc := func(c caret.MultilineContentI) bool {
				_, err := parser.ParseExpr(c.Content())
				return err == nil
			}
			from := NewTextBoxValidationWidget(np, validFunc)
			to := NewTextBoxValidationWidget(np, validFunc)

			SetViewGroup(from.Content, "bytes.Compare(a, b) != 0")
			SetViewGroup(to.Content, "!bytes.Equal(a, b)")

			/* debug
			template := new(CmdTemplate)
			*template = NewCmdTemplate("gofmt", "-r", "")
			template.Stdin = func() io.Reader { return NewContentReader(in.Content) }

			templateString := func() string {
				template.NameArgs[2] = fmt.Sprintf("%s -> %s", from.Content.Content(), to.Content.Content()) // HACK: I'm doing modification in a place that's meant to be a pure function for display, not side-effects...
				return strings.Join(template.NameArgs, " ")
			}
			cmd := NewTextLabelWidgetContentFunc(np, templateString, []DepNodeI{&from.DepNode, &to.DepNode})

			out := NewLiveCmdExpeWidget(np, []DepNodeI{in, cmd}, template)
			*/

			/*nameArgs := StringsFunc(func() []string {
				out := []string{"gofmt"}
				if from.IsValidTEST() && to.IsValidTEST() {
					out = append(out, "-r", fmt.Sprintf("%s -> %s", from.Content.Content(), to.Content.Content()))
				}
				return out
			})
			template := NewCmdTemplateDynamic(nameArgs)*/

			template := NewCmdTemplateDynamic2()
			template.UpdateFunc = func(this DepNode2I) {
				inContent := this.GetSources()[0].(caret.MultilineContentI)
				from := this.GetSources()[1].(*TextBoxWidgetValidChange)
				to := this.GetSources()[2].(*TextBoxWidgetValidChange)

				params := []string{}
				if from.IsValidTEST() && to.IsValidTEST() {
					params = append(params, "-r", fmt.Sprintf("%s -> %s", from.Content.Content(), to.Content.Content()))
				}

				template.Template = NewCmdTemplate("gofmt", params...)
				template.Template.Stdin = func() io.Reader { return NewContentReader(inContent) } // This is not a race condition only because template.NewCommand() gets called from same thread that updates in.Content.
			}
			template.AddSources(in.Content, &from.ValidChange, &to.ValidChange)

			/*debugOutput := func() string {
				cmd := template.NewCommand()
				return fmt.Sprintf("%#v", cmd.Args)
			}
			out := NewTextLabelWidgetContentFunc(np, debugOutput, []DepNodeI{&UniversalClock})*/
			out := NewLiveCmdExpeWidget(np, []DepNode2I{template}, template)

			widgets = append(widgets, NewFlowLayoutWidget(mgl64.Vec2{800, 10}, []Widgeter{in, NewTextLabelWidgetString(np, "gofmt -r "), from, NewTextLabelWidgetString(np, " -> "), to, out}, nil))

			box1 := in
			box2 := out

			/*highlightedDiff1 := &highlightedDiff{leftSide: true}
			highlightedDiff1.AddSources(box1.Content, box2.Content)
			box1.HighlightersTest = append(box1.HighlightersTest, highlightedDiff1)

			// TODO: Avoid having two objects that do similar work, merge into one with two iterators
			highlightedDiff2 := &highlightedDiff{}
			highlightedDiff2.AddSources(box1.Content, box2.Content)
			box2.HighlightersTest = append(box2.HighlightersTest, highlightedDiff2)*/

			tokenizedGoContent1 := &tokenizedGoContent{}
			tokenizedGoContent1.AddSources(box1.Content)

			tokenizedGoContent2 := &tokenizedGoContent{}
			tokenizedGoContent2.AddSources(box2.Content)

			tokenizedDiff1 := &tokenizedDiff{leftSide: true}
			tokenizedDiff1.AddSources(tokenizedGoContent1, tokenizedGoContent2)

			// TODO: Avoid having two objects that do similar work, merge into one with two iterators
			tokenizedDiff2 := &tokenizedDiff{}
			tokenizedDiff2.AddSources(tokenizedGoContent1, tokenizedGoContent2)

			box1.HighlightersTest = append(box1.HighlightersTest, tokenizedDiff1)
			box2.HighlightersTest = append(box2.HighlightersTest, tokenizedDiff2)
		}

		// +Gist Button
		{
			username := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true})
			password := NewTextBoxWidgetOptions(np, TextBoxWidgetOptions{SingleLine: true, Private: true})

			gistButtonTrigger := NewButtonTriggerWidget(np)

			params := func() interface{} { return []string{username.Content.Content(), password.Content.Content()} }
			action := func(params interface{}) string {
				username := params.([]string)[0]
				password := params.([]string)[1]

				// TODO: This should be checked at higher level
				if username == "" || password == "" {
					return ""
				}

				// Create a gist
				cmd := exec.Command("curl", "-d", "{\"public\":true,\"files\":{\"main.go\":{\"content\":\"package gist\\n\\nimport ()\\n\"}}}", "https://api.github.com/gists", "--config", "-")
				cmd.Stdin = strings.NewReader("-u \"" + username + ":" + password + "\"")
				out, err := cmd.Output() // We want only the output, ignore progress meter (hence don't use CombinedOutput())
				if err != nil {
					return goon.SdumpExpr("Error creating gist.", err, string(out))
				}
				parseGistId := func(gistJsonResponse []byte) (gistId string, err error) {
					var gistJson struct {
						Id *string
					}
					switch err := json.Unmarshal(gistJsonResponse, &gistJson); {
					case err == nil && gistJson.Id != nil:
						return *gistJson.Id, nil
					case err == nil && gistJson.Id == nil:
						return "", errors.New("gist id field missing")
					default:
						return "", err
					}
				}
				gistId, err := parseGistId(out)
				if err != nil {
					return goon.SdumpExpr("Error parsing Gist Id.", err, string(out))
				}

				// Clone the gist repo
				// HACK: Need to generalize this; perhaps use `go get` after go1.2?
				Command := "cd ../../../../" // Hopefully the "$GOPATH/" folder
				Command += "\nmkdir -p \"./src/gist.github.com\""
				Command += "\ncd \"./src/gist.github.com\""
				Command += "\ngit clone https://gist.github.com/" + gistId + ".git \"./" + gistId + ".git\""
				//Command += "\ncurl -d 'path=gist.github.com/" + gistId + ".git' http://godoc.org/-/refresh";
				cmd = exec.Command("bash", "-c", Command)
				out, err = cmd.CombinedOutput()
				if err != nil {
					return goon.SdumpExpr("Error cloning the gist repo.", err, string(out))
				}

				// Open it in a new LiveProgramFileWidget
				//const auto FullPath = "./GoLand/src/gist.github.com/" + gistId + ".git/main.go";
				//AddWidgetForPath(FullPath, *MainCanvas, *m_TypingModule, m_CurrentProject);

				// Return import statement as the output
				return ". \"gist.github.com/" + gistId + ".git\""
			}
			output := NewLiveGoroutineExpeWidget(np, true, []DepNode2I{gistButtonTrigger}, params, action)

			widgets = append(widgets, NewFlowLayoutWidget(mgl64.Vec2{500, 10}, []Widgeter{username, password, NewTextLabelWidgetString(np, "+Gist"), gistButtonTrigger, output}, nil))
		}

		// Sample Window widget
		{
			newWindowButton := NewButtonWidget(np, func() {
				w := NewWindowWidget(mgl64.Vec2{500, 500}, mgl64.Vec2{200, 140}, NewTextBoxWidget(np))
				w.Name = "New Window"

				// Add new widget to canvas
				widget.(AddWidgeter).AddWidget(w)
			})
			widgets = append(widgets, newWindowButton)

			w := NewWindowWidget(mgl64.Vec2{1000, 40}, mgl64.Vec2{200, 140}, NewTextBoxWidget(np))
			w.Name = "Sample Window"
			widgets = append(widgets, w)
		}

		// TODO: Highlighting Go code + selection at a time
		if false {
			widgets = append(widgets, NewTextBoxWidget(mgl64.Vec2{20, 240}))
			widgets = append(widgets, NewTextFileWidget(mgl64.Vec2{100, 240}, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/gist.github.com/7176504.git/main.go"))
		}

		// TEST: Live vcs status of a single repo
		if false {
			booVcs = exp12.LookupDirectory("/Users/Dmitri/Dropbox/Work/2013/GoLand/src/github.com/shurcooL/Go-Package-Store/")
			MakeUpdated(booVcs)

			params := func() interface{} {
				return []interface{}{
					booVcs.Repo.Vcs.RootPath(),
					booVcs.Repo.VcsLocal.Status,
				}
			}

			action := func(params interface{}) string {
				rootPath := params.([]interface{})[0].(string)
				vcsStatus := params.([]interface{})[1].(string)

				return rootPath + "\n" + vcsStatus
			}

			widgets = append(widgets, NewLiveGoroutineExpeWidget(mgl64.Vec2{260, 180}, false, []DepNode2I{booVcs.Repo.VcsLocal}, params, action))
		}

		// Diff experiment
		{
			box1 := NewTextBoxWidgetExternalContent(np, multilinecontent.NewString(`const Tau = 2 * math.Pi

func DrawCircle(pos mathgl.Vec2d, size mathgl.Vec2d) {
	const x = 64

	gl.Color3dv((*gl.Double)(&borderColor[0]))
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(gl.Double(pos[0]), gl.Double(pos[1]))
	for i := 0; i <= x; i++ {
		gl.Vertex2d(gl.Double(pos[0]+math.Sin(Tau*float64(i)/x)*size[0]/2), ...)
	}
	gl.End()`), nil)
			box2 := NewTextBoxWidgetExternalContent(np, multilinecontent.NewString(`
func DrawCircle(pos mathgl.Vec2d, size mathgl.Vec2d) {
	const TwoPi = math.Pi * 2

	const x = 64

	gl.Color3dv((*gl.Double)(&borderColor[0]))
	gl.Begin(gl.TRIANGLE_FAN)
	gl.Vertex2d(gl.Double(pos[0]), gl.Double(pos[1]))
	for i := 0; i <= x; i++ {
		// Completely new line
		gl.Vertex2d(gl.Double(pos[0]+math.Sin(TwoPi*float64(i)/x)*size[0]/2), ...)
	}
	gl.End()`), nil)
			widgets = append(widgets, NewFlowLayoutWidget(mgl64.Vec2{200, 250}, []Widgeter{box1, box2}, &FlowLayoutWidgetOptions{FlowLayoutType: HorizontalLayout}))

			if false {
				highlightedDiff := &highlightedDiff{}
				highlightedDiff.AddSources(box1.Content, box2.Content)

				box1.HighlightersTest = append(box1.HighlightersTest, &highlightedDiffSide{highlightedDiff: highlightedDiff, side: 0})
				box2.HighlightersTest = append(box2.HighlightersTest, &highlightedDiffSide{highlightedDiff: highlightedDiff, side: 1})
			} else {
				lineDiff := &lineDiff{}
				lineDiff.AddSources(box1.Content, box2.Content)

				lineDiffSide0 := &lineDiffSide{lineDiff: lineDiff, side: 0}
				lineDiffSide1 := &lineDiffSide{lineDiff: lineDiff, side: 1}

				box1.HighlightersTest = append(box1.HighlightersTest, lineDiffSide0)
				box2.HighlightersTest = append(box2.HighlightersTest, lineDiffSide1)

				box1.LineHighlighter = lineDiffSide0
				box2.LineHighlighter = lineDiffSide1
			}
		}

		if true {
			w := NewConnectionWidget(mgl64.Vec2{700, 500})
			widgets = append(widgets, w)
		}

		// Test having multiple .go files stacked vertically with a FlowLayoutWidget.
		if true {
			box1 := NewTextFileWidget(np, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/github.com/shurcooL/go/u/u8/main.go")
			box2 := NewTextFileWidget(np, "/Users/Dmitri/Dropbox/Work/2013/GoLand/src/github.com/shurcooL/go/u/u8/main_test.go")
			boxes := NewFlowLayoutWidget(mgl64.Vec2{1130, 220}, Widgeters{box1, box2}, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout})
			widgets = append(widgets, boxes)
		}
	}

	fpsWidget := NewFpsWidget(mgl64.Vec2{10, 120})

	// Http Server
	initHttpHandlers()

	// lifeFormWidget test.
	//widgets = append(widgets, NewLifeFormWidget(mathgl.Vec2d{400, 400}))

	// Debug Panel
	if !*headlessFlag {
		var w Widgeters
		{
			contentFunc := func() (out string) {
				for _, widget := range mousePointer.Mapping {
					out += fmt.Sprintf("%T\n", widget)
				}
				return strings.TrimSuffix(out, "\n")
			}
			w = append(w, NewCollapsibleWidget(np, NewTextLabelWidgetExternalContent(np, NewMultilineContentFuncInstant(contentFunc)), "Mouse Mapping"))
		}
		{
			contentFunc := func() (out string) {
				for _, widget := range mousePointer.OriginMapping {
					out += fmt.Sprintf("%T\n", widget)
				}
				return strings.TrimSuffix(out, "\n")
			}
			w = append(w, NewCollapsibleWidget(np, NewTextLabelWidgetExternalContent(np, NewMultilineContentFuncInstant(contentFunc)), "Mouse Origin Mapping"))
		}
		{
			contentFunc := func() (out string) {
				for _, widget := range keyboardPointer.OriginMapping {
					out += fmt.Sprintf("%T\n", widget)
				}
				return strings.TrimSuffix(out, "\n")
			}
			w = append(w, NewCollapsibleWidget(np, NewTextLabelWidgetExternalContent(np, NewMultilineContentFuncInstant(contentFunc)), "Keyboard Origin Mapping"))
		}
		w = append(w, NewGoonWidget(np, &mousePointer))
		w = append(w, NewGoonWidget(np, &keyboardPointer))
		w = append(w, NewGoonWidget(np, &widgets))

		w = append(w, NewGoonWidget(np, &lodBias))

		w = append(w, fpsWidget)

		// Number of Goroutines.
		{
			contentFunc := func() string { return fmt.Sprint("Goroutines: ", runtime.NumGoroutine()) }
			mc := NewMultilineContentFunc(contentFunc, []DepNodeI{&UniversalClock})
			w = append(w, NewTextLabelWidgetExternalContent(mgl64.Vec2{10, 40}, mc))
		}

		// Http Server
		w = append(w, NewHttpServerTestWidget(mgl64.Vec2{10, 130}))

		widgets = append(widgets, NewCollapsibleWidget(np, NewFlowLayoutWidget(np, w, &FlowLayoutWidgetOptions{FlowLayoutType: VerticalLayout}), "Debug"))
	} else {
		NewHttpServerTestWidget(np)
	}

	switch *modeFlag {
	case 8:
		widget = NewCanvasWidget(mgl64.Vec2{0, 0}, widgets, &CanvasWidgetOptions{Scrollable: true})
		widget.(*CanvasWidget).offset = mgl64.Vec2{-200, -640}
	case 1, 5, 9:
		widget = NewCanvasWidget(mgl64.Vec2{0, 0}, widgets, &CanvasWidgetOptions{Scrollable: false})
	default:
		widget = NewCanvasWidget(mgl64.Vec2{0, 0}, widgets, &CanvasWidgetOptions{Scrollable: true})
	}
	widget.(*CanvasWidget).offsetBy1Px()
	if windowPointer != nil {
		windowPointer.OriginMapping = []Widgeter{widget}
	}
	//widget := NewFlowLayoutWidget(mathgl.Vec2d{1, 1}, widgets, nil)
	//widget = NewCompositeWidget(mathgl.Vec2d{1, 1}, widgets)

	if keyboardPointer != nil && len(keyboardPointer.OriginMapping) == 0 {
		// Give the canvas initial keyboard focus
		// TODO: Request pointer mapping in a kinder way (rather than forcing it - what if it's active and shouldn't be changed)
		keyboardPointer.OriginMapping = []Widgeter{widget}
	}

	fmt.Printf("Loaded in %v ms.\n", time.Since(startedProcess).Seconds()*1000)

	// ---

	firstFrame := true
	for keepRunning {
		frameStartTime := time.Now()

		if !*headlessFlag {
			//glfw.WaitEvents()
			glfw.PollEvents()
		}

		// Move all input events from inputEventQueue2 into inputEventQueue.
	inputEventQueue2Loop:
		for {
			select {
			case inputEvent := <-inputEventQueue2:
				inputEventQueue = EnqueueInputEvent(inputEventQueue, inputEvent)
				redraw = true // TODO: Move redraw = true elsewhere? Like somewhere within events processing? Or keep it in all event handlers?
			default:
				break inputEventQueue2Loop
			}
		}

		// Process Input.
		inputEventQueue = ProcessInputEventQueue(widget, inputEventQueue)

		// TEMPORARY, HACK
		if booVcs != nil {
			ExternallyUpdated(booVcs.Repo.VcsLocal.GetSources()[1].(DepNode2ManualI)) // TODO: Updating this every frame is very slow (and should be done in background, not block main thread)
		}

		// DepNode2 dependency resolution
		// TODO: General solution
		/*if goCompileErrorsEnabledTest != nil && goCompileErrorsEnabledTest.state() {
			MakeUpdated(&goCompileErrorsManagerTest)
		}*/
		MakeUpdated(&goCompileErrorsManagerTest) // TODO: Only when build is on
		MakeUpdated(&spinner)
		for _, keepUpdatedEntry := range keepUpdatedTEST {
			MakeUpdated(keepUpdatedEntry)
		}

		widget.PollLogic()

		UniversalClock.TimePassed = 1.0 / 60 // TODO: Use proper value?
		UniversalClock.NotifyAllListeners()

		if redraw && !*headlessFlag {
			//gl.Clear(gl.COLOR_BUFFER_BIT)
			gl.LoadIdentity()

			widget.LayoutNeeded()
			widget.Render()

			mousePointer.Render()
			keyboardPointer.Render()
			if websocketPointer != nil {
				websocketPointer.Render()
			}

			fpsWidget.PushTimeToRender(time.Since(frameStartTime).Seconds() * 1000)
			window.SwapBuffers()
			runtime.Gosched()

			fpsWidget.PushTimeTotal(time.Since(frameStartTime).Seconds() * 1000)
			redraw = false
		} else {
			time.Sleep(5 * time.Millisecond)
			runtime.Gosched()
		}

		if firstFrame {
			if !*headlessFlag {
				// Hide the system cursor when main render loop is underway.
				window.SetInputMode(glfw.CursorMode, glfw.CursorHidden)
			}

			fmt.Printf("First frame in %v ms.\n", time.Since(startedProcess).Seconds()*1000)
			firstFrame = false
		}
	}

	_ = widget.Close()
	os.Remove(con2RunBinPath) // TODO: Generalize this

	fmt.Println("Graceful exit.")
}

// =====

// readFileOrEmpty returns the contents of file. If an error is encountered, an empty string is returned.
func readFileOrEmpty(filename string) string {
	b, err := ioutil.ReadFile(filename)
	if err != nil {
		return ""
	}
	return string(b)
}