105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
// Package vfspath implements utility routines for manipulating virtual file system paths.
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package vfspath
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import (
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"net/http"
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"os"
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"path"
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"sort"
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"strings"
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"github.com/shurcooL/httpfs/vfsutil"
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)
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const separator = "/"
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// Glob returns the names of all files matching pattern or nil
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// if there is no matching file. The syntax of patterns is the same
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// as in path.Match. The pattern may describe hierarchical names such as
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// /usr/*/bin/ed.
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//
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// Glob ignores file system errors such as I/O errors reading directories.
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// The only possible returned error is ErrBadPattern, when pattern
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// is malformed.
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func Glob(fs http.FileSystem, pattern string) (matches []string, err error) {
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if !hasMeta(pattern) {
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if _, err = vfsutil.Stat(fs, pattern); err != nil {
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return nil, nil
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}
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return []string{pattern}, nil
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}
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dir, file := path.Split(pattern)
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switch dir {
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case "":
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dir = "."
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case string(separator):
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// nothing
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default:
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dir = dir[0 : len(dir)-1] // chop off trailing separator
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}
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if !hasMeta(dir) {
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return glob(fs, dir, file, nil)
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}
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var m []string
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m, err = Glob(fs, dir)
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if err != nil {
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return
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}
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for _, d := range m {
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matches, err = glob(fs, d, file, matches)
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if err != nil {
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return
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}
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}
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return
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}
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// glob searches for files matching pattern in the directory dir
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// and appends them to matches. If the directory cannot be
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// opened, it returns the existing matches. New matches are
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// added in lexicographical order.
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func glob(fs http.FileSystem, dir, pattern string, matches []string) (m []string, e error) {
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m = matches
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fi, err := vfsutil.Stat(fs, dir)
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if err != nil {
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return
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}
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if !fi.IsDir() {
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return
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}
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fis, err := vfsutil.ReadDir(fs, dir)
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if err != nil {
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return
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}
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sort.Sort(byName(fis))
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for _, fi := range fis {
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n := fi.Name()
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matched, err := path.Match(path.Clean(pattern), n)
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if err != nil {
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return m, err
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}
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if matched {
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m = append(m, path.Join(dir, n))
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}
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}
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return
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}
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// hasMeta reports whether path contains any of the magic characters
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// recognized by Match.
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func hasMeta(path string) bool {
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// TODO(niemeyer): Should other magic characters be added here?
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return strings.ContainsAny(path, "*?[")
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}
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// byName implements sort.Interface.
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type byName []os.FileInfo
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func (f byName) Len() int { return len(f) }
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func (f byName) Less(i, j int) bool { return f[i].Name() < f[j].Name() }
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func (f byName) Swap(i, j int) { f[i], f[j] = f[j], f[i] }
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