syncthing/lib/versioner/util.go
2015-08-09 09:35:26 +02:00

49 lines
1.2 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package versioner
import (
"path/filepath"
"regexp"
"sort"
)
// Inserts ~tag just before the extension of the filename.
func taggedFilename(name, tag string) string {
dir, file := filepath.Dir(name), filepath.Base(name)
ext := filepath.Ext(file)
withoutExt := file[:len(file)-len(ext)]
return filepath.Join(dir, withoutExt+"~"+tag+ext)
}
var tagExp = regexp.MustCompile(`.*~([^~.]+)(?:\.[^.]+)?$`)
// Returns the tag from a filename, whether at the end or middle.
func filenameTag(path string) string {
match := tagExp.FindStringSubmatch(path)
// match is []string{"whole match", "submatch"} when successful
if len(match) != 2 {
return ""
}
return match[1]
}
func uniqueSortedStrings(strings []string) []string {
seen := make(map[string]struct{}, len(strings))
unique := make([]string, 0, len(strings))
for _, str := range strings {
_, ok := seen[str]
if !ok {
seen[str] = struct{}{}
unique = append(unique, str)
}
}
sort.Strings(unique)
return unique
}