78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fs
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import (
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"errors"
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"sort"
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)
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// ReadDirFS is the interface implemented by a file system
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// that provides an optimized implementation of ReadDir.
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type ReadDirFS interface {
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FS
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// ReadDir reads the named directory
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// and returns a list of directory entries sorted by filename.
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ReadDir(name string) ([]DirEntry, error)
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}
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// ReadDir reads the named directory
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// and returns a list of directory entries sorted by filename.
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//
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// If fs implements ReadDirFS, ReadDir calls fs.ReadDir.
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// Otherwise ReadDir calls fs.Open and uses ReadDir and Close
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// on the returned file.
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func ReadDir(fsys FS, name string) ([]DirEntry, error) {
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if fsys, ok := fsys.(ReadDirFS); ok {
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return fsys.ReadDir(name)
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}
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file, err := fsys.Open(name)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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dir, ok := file.(ReadDirFile)
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if !ok {
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return nil, &PathError{Op: "readdir", Path: name, Err: errors.New("not implemented")}
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}
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list, err := dir.ReadDir(-1)
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sort.Slice(list, func(i, j int) bool { return list[i].Name() < list[j].Name() })
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return list, err
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}
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// dirInfo is a DirEntry based on a FileInfo.
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type dirInfo struct {
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fileInfo FileInfo
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}
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func (di dirInfo) IsDir() bool {
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return di.fileInfo.IsDir()
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}
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func (di dirInfo) Type() FileMode {
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return di.fileInfo.Mode().Type()
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}
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func (di dirInfo) Info() (FileInfo, error) {
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return di.fileInfo, nil
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}
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func (di dirInfo) Name() string {
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return di.fileInfo.Name()
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}
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// FileInfoToDirEntry returns a DirEntry that returns information from info.
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// If info is nil, FileInfoToDirEntry returns nil.
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func FileInfoToDirEntry(info FileInfo) DirEntry {
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if info == nil {
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return nil
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}
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return dirInfo{fileInfo: info}
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}
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