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90 lines
2.9 KiB
Go
90 lines
2.9 KiB
Go
// Copyright 2009 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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// This part copied directly from golang.org/src/path/filepath/path.go (Go
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// 1.6) and lightly modified to be methods on BasicFilesystem.
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// In our Walk() all paths given to a WalkFunc() are relative to the
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// filesystem root.
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package fs
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import "path/filepath"
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// WalkFunc is the type of the function called for each file or directory
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// visited by Walk. The path argument contains the argument to Walk as a
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// prefix; that is, if Walk is called with "dir", which is a directory
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// containing the file "a", the walk function will be called with argument
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// "dir/a". The info argument is the FileInfo for the named path.
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//
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// If there was a problem walking to the file or directory named by path, the
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// incoming error will describe the problem and the function can decide how
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// to handle that error (and Walk will not descend into that directory). If
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// an error is returned, processing stops. The sole exception is when the function
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// returns the special value SkipDir. If the function returns SkipDir when invoked
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// on a directory, Walk skips the directory's contents entirely.
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// If the function returns SkipDir when invoked on a non-directory file,
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// Walk skips the remaining files in the containing directory.
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type WalkFunc func(path string, info FileInfo, err error) error
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type walkFilesystem struct {
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Filesystem
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}
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func NewWalkFilesystem(next Filesystem) Filesystem {
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return &walkFilesystem{next}
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}
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// walk recursively descends path, calling walkFn.
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func (f *walkFilesystem) walk(path string, info FileInfo, walkFn WalkFunc) error {
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err := walkFn(path, info, nil)
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if err != nil {
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if info.IsDir() && err == SkipDir {
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return nil
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}
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return err
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}
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if !info.IsDir() && path != "." {
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return nil
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}
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names, err := f.DirNames(path)
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if err != nil {
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return walkFn(path, info, err)
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}
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for _, name := range names {
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filename := filepath.Join(path, name)
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fileInfo, err := f.Lstat(filename)
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if err != nil {
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if err := walkFn(filename, fileInfo, err); err != nil && err != SkipDir {
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return err
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}
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} else {
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err = f.walk(filename, fileInfo, walkFn)
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if err != nil {
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if !fileInfo.IsDir() || err != SkipDir {
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return err
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}
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}
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}
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}
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return nil
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}
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// Walk walks the file tree rooted at root, calling walkFn for each file or
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// directory in the tree, including root. All errors that arise visiting files
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// and directories are filtered by walkFn. The files are walked in lexical
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// order, which makes the output deterministic but means that for very
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// large directories Walk can be inefficient.
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// Walk does not follow symbolic links.
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func (f *walkFilesystem) Walk(root string, walkFn WalkFunc) error {
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info, err := f.Lstat(root)
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if err != nil {
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return walkFn(root, nil, err)
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}
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return f.walk(root, info, walkFn)
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}
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