// Copyright 2015 The Gogs Authors. All rights reserved.// Use of this source code is governed by a MIT-style// license that can be found in the LICENSE file. package git import (	"fmt"	"io"	"os"	"strconv"	"strings"	"sync" 	"code.gitea.io/gitea/modules/util") // ObjectCache provides thread-safe cache operations.type ObjectCache struct {	lock  sync.RWMutex	cache map[string]interface{}} func newObjectCache() *ObjectCache {	return &ObjectCache{		cache: make(map[string]interface{}, 10),	}} // Set add obj to cachefunc (oc *ObjectCache) Set(id string, obj interface{}) {	oc.lock.Lock()	defer oc.lock.Unlock() 	oc.cache[id] = obj} // Get get cached obj by idfunc (oc *ObjectCache) Get(id string) (interface{}, bool) {	oc.lock.RLock()	defer oc.lock.RUnlock() 	obj, has := oc.cache[id]	return obj, has} // isDir returns true if given path is a directory,// or returns false when it's a file or does not exist.func isDir(dir string) bool {	f, e := os.Stat(dir)	if e != nil {		return false	}	return f.IsDir()} // isFile returns true if given path is a file,// or returns false when it's a directory or does not exist.func isFile(filePath string) bool {	f, e := os.Stat(filePath)	if e != nil {		return false	}	return !f.IsDir()} // isExist checks whether a file or directory exists.// It returns false when the file or directory does not exist.func isExist(path string) bool {	_, err := os.Stat(path)	return err == nil || os.IsExist(err)} // ConcatenateError concatenats an error with stderr stringfunc ConcatenateError(err error, stderr string) error {	if len(stderr) == 0 {		return err	}	return fmt.Errorf("%w - %s", err, stderr)} // RefEndName return the end name of a ref namefunc RefEndName(refStr string) string {	if strings.HasPrefix(refStr, BranchPrefix) {		return refStr[len(BranchPrefix):]	} 	if strings.HasPrefix(refStr, TagPrefix) {		return refStr[len(TagPrefix):]	} 	return refStr} // RefURL returns the absolute URL for a ref in a repositoryfunc RefURL(repoURL, ref string) string {	refName := util.PathEscapeSegments(RefEndName(ref))	switch {	case strings.HasPrefix(ref, BranchPrefix):		return repoURL + "/src/branch/" + refName	case strings.HasPrefix(ref, TagPrefix):		return repoURL + "/src/tag/" + refName	default:		return repoURL + "/src/commit/" + refName	}} // SplitRefName splits a full refname to reftype and simple refnamefunc SplitRefName(refStr string) (string, string) {	if strings.HasPrefix(refStr, BranchPrefix) {		return BranchPrefix, refStr[len(BranchPrefix):]	} 	if strings.HasPrefix(refStr, TagPrefix) {		return TagPrefix, refStr[len(TagPrefix):]	} 	return "", refStr} // ParseBool returns the boolean value represented by the string as per git's git_config_bool// true will be returned for the result if the string is empty, but valid will be false.// "true", "yes", "on" are all true, true// "false", "no", "off" are all false, true// 0 is false, true// Any other integer is true, true// Anything else will return false, falsefunc ParseBool(value string) (result, valid bool) {	// Empty strings are true but invalid	if len(value) == 0 {		return true, false	}	// These are the git expected true and false values	if strings.EqualFold(value, "true") || strings.EqualFold(value, "yes") || strings.EqualFold(value, "on") {		return true, true	}	if strings.EqualFold(value, "false") || strings.EqualFold(value, "no") || strings.EqualFold(value, "off") {		return false, true	}	// Try a number	intValue, err := strconv.ParseInt(value, 10, 32)	if err != nil {		return false, false	}	return intValue != 0, true} // LimitedReaderCloser is a limited reader closertype LimitedReaderCloser struct {	R io.Reader	C io.Closer	N int64} // Read implements io.Readerfunc (l *LimitedReaderCloser) Read(p []byte) (n int, err error) {	if l.N <= 0 {		_ = l.C.Close()		return 0, io.EOF	}	if int64(len(p)) > l.N {		p = p[0:l.N]	}	n, err = l.R.Read(p)	l.N -= int64(n)	return} // Close implements io.Closerfunc (l *LimitedReaderCloser) Close() error {	return l.C.Close()}