mirror of
https://github.com/syncthing/syncthing.git
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49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package versioner
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import (
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"path/filepath"
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"regexp"
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"strings"
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)
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// Inserts ~tag just before the extension of the filename.
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func TagFilename(name, tag string) string {
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dir, file := filepath.Dir(name), filepath.Base(name)
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ext := filepath.Ext(file)
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withoutExt := file[:len(file)-len(ext)]
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return filepath.Join(dir, withoutExt+"~"+tag+ext)
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}
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var tagExp = regexp.MustCompile(`.*~([^~.]+)(?:\.[^.]+)?$`)
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// Returns the tag from a filename, whether at the end or middle.
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func ExtractTag(path string) string {
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match := tagExp.FindStringSubmatch(path)
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// match is []string{"whole match", "submatch"} when successful
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if len(match) != 2 {
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return ""
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}
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return match[1]
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}
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func UntagFilename(path string) (string, string) {
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ext := filepath.Ext(path)
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versionTag := ExtractTag(path)
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// Files tagged with old style tags cannot be untagged.
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if versionTag == "" || strings.HasSuffix(ext, versionTag) {
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return "", ""
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}
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withoutExt := path[:len(path)-len(ext)-len(versionTag)-1]
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name := withoutExt + ext
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return name, versionTag
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}
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