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main.go
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main.go
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package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
)
type FileLineFormatter interface {
FormatLine(fi os.FileInfo) string
FormatLastLine(fi os.FileInfo) string
CreateChildFormatter() FileLineFormatter
}
const (
levelDelim = '│'
lineDelim = '├'
lastLineDelim = '└'
)
type BeautyFileLineFormatter struct {
includeSize bool
wasLastLine bool
fmtStr string
}
func NewBeautyFileLineFormatter(includeSize bool) *BeautyFileLineFormatter {
return &BeautyFileLineFormatter{includeSize: includeSize}
}
func (f *BeautyFileLineFormatter) CreateChildFormatter() FileLineFormatter {
fmtStr := f.fmtStr
if !f.wasLastLine {
fmtStr += string(levelDelim)
}
fmtStr += "\t"
return &BeautyFileLineFormatter{
fmtStr: fmtStr,
includeSize: f.includeSize,
}
}
func (f *BeautyFileLineFormatter) FormatLine(fi os.FileInfo) string {
return f.format(fi, lineDelim)
}
func (f *BeautyFileLineFormatter) FormatLastLine(fi os.FileInfo) string {
f.wasLastLine = true
return f.format(fi, lastLineDelim)
}
func (f *BeautyFileLineFormatter) format(fi os.FileInfo, delim rune) string {
res := fmt.Sprintf("%s%c───%s", f.fmtStr, delim, fi.Name())
if !f.includeSize || fi.IsDir() {
return res
}
if fi.Size() == 0 {
return res + " (empty)"
}
return res + fmt.Sprintf(" (%db)", fi.Size())
}
func filterFilesInfo(fiList []os.FileInfo, filter func(os.FileInfo) bool) []os.FileInfo {
res := make([]os.FileInfo, 0)
for _, fi := range fiList {
if filter(fi) {
res = append(res, fi)
}
}
return res
}
func dirTreeInner(out io.Writer, path string, flFmt FileLineFormatter, printFiles bool) error {
fiList, err := ioutil.ReadDir(path)
if err != nil {
return fmt.Errorf("failed to read directory: %v", err)
}
if !printFiles {
fiList = filterFilesInfo(fiList, func(fi os.FileInfo) bool {
return fi.IsDir()
})
}
for i, fi := range fiList {
var line string
isLast := i == len(fiList)-1
if isLast {
line = flFmt.FormatLastLine(fi)
} else {
line = flFmt.FormatLine(fi)
}
if _, err = fmt.Fprintln(out, line); err != nil {
return fmt.Errorf("failed to print line into %T", out)
}
if fi.IsDir() {
dirFmt := flFmt.CreateChildFormatter()
dirPath := filepath.Join(path, fi.Name())
if err = dirTreeInner(out, dirPath, dirFmt, printFiles); err != nil {
return err
}
}
}
return nil
}
func dirTree(out io.Writer, path string, printFiles bool) error {
flFmt := NewBeautyFileLineFormatter(printFiles)
return dirTreeInner(out, path, flFmt, printFiles)
}
func main() {
out := os.Stdout
if !(len(os.Args) == 2 || len(os.Args) == 3) {
panic("usage go run main.go . [-f]")
}
path := os.Args[1]
printFiles := len(os.Args) == 3 && os.Args[2] == "-f"
err := dirTree(out, path, printFiles)
if err != nil {
panic(err.Error())
}
}