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stdin.go
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/
stdin.go
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package main
import (
"fmt"
"os"
"reflect"
"github.com/DeedleFake/wdte"
"github.com/DeedleFake/wdte/repl"
"github.com/DeedleFake/wdte/scanner"
"github.com/DeedleFake/wdte/std"
"github.com/peterh/liner"
"golang.org/x/crypto/ssh/terminal"
)
func printRet(ret wdte.Func) {
switch ret := ret.(type) {
case error, fmt.Stringer:
fmt.Printf(": %v\n", ret)
return
}
switch k := reflect.Indirect(reflect.ValueOf(ret)).Kind(); k {
case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Struct, reflect.UnsafePointer:
fmt.Printf(": complex value (%v)\n", k)
default:
fmt.Printf(": %v\n", ret)
}
}
func stdin(im wdte.Importer, macros scanner.MacroMap) {
if !terminal.IsTerminal(int(os.Stdin.Fd())) {
file(im, os.Stdin)
return
}
lr := liner.NewLiner()
lr.SetCtrlCAborts(true)
defer lr.Close()
const (
modeTop = ">>> "
modeSub = "... "
)
mode := modeTop
next := func() ([]byte, error) {
line, err := lr.Prompt(mode)
if err == nil {
lr.AppendHistory(line)
}
return []byte(line + "\n"), err
}
r := repl.New(next, im, macros, std.Scope)
for {
ret, err := r.Next()
if err != nil {
if err == repl.ErrIncomplete {
mode = modeSub
continue
}
if err == liner.ErrPromptAborted {
r.Cancel()
mode = modeTop
continue
}
fmt.Fprintf(os.Stderr, "Error: %v\n", err)
continue
}
if ret == nil {
break
}
printRet(ret)
mode = modeTop
}
}