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