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