Changes to internal/fmtdirent/. All files

internal/fmtdirent/fmtdirent_go120.go

new file mode 100644@@ -0,0 +1,31 @@+//go:build !go1.21++package fmtdirent++import "io/fs"++// Backport fs.FormatDirEntry from go1.21++// FormatDirEntry returns a formatted version of dir for human readability.+// Implementations of [DirEntry] can call this from a String method.+// The outputs for a directory named subdir and a file named hello.go are:+//+//	d subdir/+//	- hello.go+func FormatDirEntry(dir fs.DirEntry) string {+	name := dir.Name()+	b := make([]byte, 0, 5+len(name))++	// The Type method does not return any permission bits,+	// so strip them from the string.+	mode := dir.Type().String()+	mode = mode[:len(mode)-9]++	b = append(b, mode...)+	b = append(b, ' ')+	b = append(b, name...)+	if dir.IsDir() {+		b = append(b, '/')+	}+	return string(b)+}

internal/fmtdirent/fmtdirent_go120_test.go

new file mode 100644@@ -0,0 +1,118 @@+//go:build !go1.21++// Copyright 2023 The Go Authors. All rights reserved.+// Use of this source code is governed by a BSD-style+// license that can be found in the LICENSE file.++// Backport fs.FormatDirEntry tests from go1.21. We don't test+// the go1.21+ FormatDirEntry function since it just calls the+// stdlib and we don't want changes in its output to break our+// tests.++package fmtdirent_test++import (+	. "io/fs"+	"testing"+	"time"++	"github.com/charlievieth/fastwalk/internal/fmtdirent"+)++// formatTest implements FileInfo to test FormatFileInfo,+// and implements DirEntry to test FormatDirEntry.+type formatTest struct {+	name    string+	size    int64+	mode    FileMode+	modTime time.Time+	isDir   bool+}++func (fs *formatTest) Name() string {+	return fs.name+}++func (fs *formatTest) Size() int64 {+	return fs.size+}++func (fs *formatTest) Mode() FileMode {+	return fs.mode+}++func (fs *formatTest) ModTime() time.Time {+	return fs.modTime+}++func (fs *formatTest) IsDir() bool {+	return fs.isDir+}++func (fs *formatTest) Sys() any {+	return nil+}++func (fs *formatTest) Type() FileMode {+	return fs.mode.Type()+}++func (fs *formatTest) Info() (FileInfo, error) {+	return fs, nil+}++var formatTests = []struct {+	input        formatTest+	wantDirEntry string+}{+	{+		formatTest{+			name:    "hello.go",+			size:    100,+			mode:    0o644,+			modTime: time.Date(1970, time.January, 1, 12, 0, 0, 0, time.UTC),+			isDir:   false,+		},+		"- hello.go",+	},+	{+		formatTest{+			name:    "home/gopher",+			size:    0,+			mode:    ModeDir | 0o755,+			modTime: time.Date(1970, time.January, 1, 12, 0, 0, 0, time.UTC),+			isDir:   true,+		},+		"d home/gopher/",+	},+	{+		formatTest{+			name:    "big",+			size:    0x7fffffffffffffff,+			mode:    ModeIrregular | 0o644,+			modTime: time.Date(1970, time.January, 1, 12, 0, 0, 0, time.UTC),+			isDir:   false,+		},+		"? big",+	},+	{+		formatTest{+			name:    "small",+			size:    -0x8000000000000000,+			mode:    ModeSocket | ModeSetuid | 0o644,+			modTime: time.Date(1970, time.January, 1, 12, 0, 0, 0, time.UTC),+			isDir:   false,+		},+		"S small",+	},+}++func TestFormatDirEntry(t *testing.T) {+	for i, test := range formatTests {+		got := fmtdirent.FormatDirEntry(&test.input)+		if got != test.wantDirEntry {+			t.Errorf("%d: FormatDirEntry(%#v) = %q, want %q", i, test.input, got, test.wantDirEntry)+		}+	}++}

internal/fmtdirent/fmtdirent_go121.go

new file mode 100644@@ -0,0 +1,15 @@+//go:build go1.21++package fmtdirent++import "io/fs"++// FormatDirEntry returns a formatted version of dir for human readability.+// Implementations of [DirEntry] can call this from a String method.+// The outputs for a directory named subdir and a file named hello.go are:+//+//	d subdir/+//	- hello.go+func FormatDirEntry(dir fs.DirEntry) string {+	return fs.FormatDirEntry(dir)+}