mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-20 18:12:35 +01:00
96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
// Package fs provides filesystem-related functions.
|
|
package fs
|
|
|
|
import (
|
|
"os"
|
|
)
|
|
|
|
// Walker provides a convenient interface for iterating over the
|
|
// descendants of a filesystem path.
|
|
// Successive calls to the Step method will step through each
|
|
// file or directory in the tree, including the root. The files
|
|
// are walked in lexical order, which makes the output deterministic
|
|
// but means that for very large directories Walker can be inefficient.
|
|
// Walker does not follow symbolic links.
|
|
type Walker struct {
|
|
fs FileSystem
|
|
cur item
|
|
stack []item
|
|
descend bool
|
|
}
|
|
|
|
type item struct {
|
|
path string
|
|
info os.FileInfo
|
|
err error
|
|
}
|
|
|
|
// Walk returns a new Walker rooted at root.
|
|
func Walk(root string) *Walker {
|
|
return WalkFS(root, new(fs))
|
|
}
|
|
|
|
// WalkFS returns a new Walker rooted at root on the FileSystem fs.
|
|
func WalkFS(root string, fs FileSystem) *Walker {
|
|
info, err := fs.Lstat(root)
|
|
return &Walker{
|
|
fs: fs,
|
|
stack: []item{{root, info, err}},
|
|
}
|
|
}
|
|
|
|
// Step advances the Walker to the next file or directory,
|
|
// which will then be available through the Path, Stat,
|
|
// and Err methods.
|
|
// It returns false when the walk stops at the end of the tree.
|
|
func (w *Walker) Step() bool {
|
|
if w.descend && w.cur.err == nil && w.cur.info.IsDir() {
|
|
list, err := w.fs.ReadDir(w.cur.path)
|
|
if err != nil {
|
|
w.cur.err = err
|
|
w.stack = append(w.stack, w.cur)
|
|
} else {
|
|
for i := len(list) - 1; i >= 0; i-- {
|
|
path := w.fs.Join(w.cur.path, list[i].Name())
|
|
w.stack = append(w.stack, item{path, list[i], nil})
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(w.stack) == 0 {
|
|
return false
|
|
}
|
|
i := len(w.stack) - 1
|
|
w.cur = w.stack[i]
|
|
w.stack = w.stack[:i]
|
|
w.descend = true
|
|
return true
|
|
}
|
|
|
|
// Path returns the path to the most recent file or directory
|
|
// visited by a call to Step. It contains the argument to Walk
|
|
// as a prefix; that is, if Walk is called with "dir", which is
|
|
// a directory containing the file "a", Path will return "dir/a".
|
|
func (w *Walker) Path() string {
|
|
return w.cur.path
|
|
}
|
|
|
|
// Stat returns info for the most recent file or directory
|
|
// visited by a call to Step.
|
|
func (w *Walker) Stat() os.FileInfo {
|
|
return w.cur.info
|
|
}
|
|
|
|
// Err returns the error, if any, for the most recent attempt
|
|
// by Step to visit a file or directory. If a directory has
|
|
// an error, w will not descend into that directory.
|
|
func (w *Walker) Err() error {
|
|
return w.cur.err
|
|
}
|
|
|
|
// SkipDir causes the currently visited directory to be skipped.
|
|
// If w is not on a directory, SkipDir has no effect.
|
|
func (w *Walker) SkipDir() {
|
|
w.descend = false
|
|
}
|