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match.go (2869B)

      1 // Copyright © 2014 Steve Francia <spf@spf13.com>.
      2 // Copyright 2009 The Go Authors. All rights reserved.
      3 
      4 // Licensed under the Apache License, Version 2.0 (the "License");
      5 // you may not use this file except in compliance with the License.
      6 // You may obtain a copy of the License at
      7 // http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 package afero
     16 
     17 import (
     18 	"path/filepath"
     19 	"sort"
     20 	"strings"
     21 )
     22 
     23 // Glob returns the names of all files matching pattern or nil
     24 // if there is no matching file. The syntax of patterns is the same
     25 // as in Match. The pattern may describe hierarchical names such as
     26 // /usr/*/bin/ed (assuming the Separator is '/').
     27 //
     28 // Glob ignores file system errors such as I/O errors reading directories.
     29 // The only possible returned error is ErrBadPattern, when pattern
     30 // is malformed.
     31 //
     32 // This was adapted from (http://golang.org/pkg/path/filepath) and uses several
     33 // built-ins from that package.
     34 func Glob(fs Fs, pattern string) (matches []string, err error) {
     35 	if !hasMeta(pattern) {
     36 		// Lstat not supported by a ll filesystems.
     37 		if _, err = lstatIfPossible(fs, pattern); err != nil {
     38 			return nil, nil
     39 		}
     40 		return []string{pattern}, nil
     41 	}
     42 
     43 	dir, file := filepath.Split(pattern)
     44 	switch dir {
     45 	case "":
     46 		dir = "."
     47 	case string(filepath.Separator):
     48 	// nothing
     49 	default:
     50 		dir = dir[0 : len(dir)-1] // chop off trailing separator
     51 	}
     52 
     53 	if !hasMeta(dir) {
     54 		return glob(fs, dir, file, nil)
     55 	}
     56 
     57 	var m []string
     58 	m, err = Glob(fs, dir)
     59 	if err != nil {
     60 		return
     61 	}
     62 	for _, d := range m {
     63 		matches, err = glob(fs, d, file, matches)
     64 		if err != nil {
     65 			return
     66 		}
     67 	}
     68 	return
     69 }
     70 
     71 // glob searches for files matching pattern in the directory dir
     72 // and appends them to matches. If the directory cannot be
     73 // opened, it returns the existing matches. New matches are
     74 // added in lexicographical order.
     75 func glob(fs Fs, dir, pattern string, matches []string) (m []string, e error) {
     76 	m = matches
     77 	fi, err := fs.Stat(dir)
     78 	if err != nil {
     79 		return
     80 	}
     81 	if !fi.IsDir() {
     82 		return
     83 	}
     84 	d, err := fs.Open(dir)
     85 	if err != nil {
     86 		return
     87 	}
     88 	defer d.Close()
     89 
     90 	names, _ := d.Readdirnames(-1)
     91 	sort.Strings(names)
     92 
     93 	for _, n := range names {
     94 		matched, err := filepath.Match(pattern, n)
     95 		if err != nil {
     96 			return m, err
     97 		}
     98 		if matched {
     99 			m = append(m, filepath.Join(dir, n))
    100 		}
    101 	}
    102 	return
    103 }
    104 
    105 // hasMeta reports whether path contains any of the magic characters
    106 // recognized by Match.
    107 func hasMeta(path string) bool {
    108 	// TODO(niemeyer): Should other magic characters be added here?
    109 	return strings.ContainsAny(path, "*?[")
    110 }