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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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