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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package glob
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/google/blueprint/deptools"
)
func IsGlob(glob string) bool {
return strings.IndexAny(glob, "*?[") >= 0
}
// GlobWithDepFile finds all files that match glob. It compares the list of files
// against the contents of fileListFile, and rewrites fileListFile if it has changed. It also
// writes all of the the directories it traversed as a depenencies on fileListFile to depFile.
//
// The format of glob is either path/*.ext for a single directory glob, or path/**/*.ext
// for a recursive glob.
//
// Returns a list of file paths, and an error.
func GlobWithDepFile(glob, fileListFile, depFile string, excludes []string) (files []string, err error) {
globPattern := filepath.Base(glob)
globDir := filepath.Dir(glob)
recursive := false
if filepath.Base(globDir) == "**" {
recursive = true
globDir = filepath.Dir(globDir)
}
var dirs []string
err = filepath.Walk(globDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.Mode().IsDir() {
dirs = append(dirs, path)
if !recursive && path != globDir {
return filepath.SkipDir
}
} else if info.Mode().IsRegular() {
match, err := filepath.Match(globPattern, info.Name())
if err != nil {
return err
}
if match {
for _, e := range excludes {
var excludeMatch bool
if filepath.Base(e) == e {
excludeMatch, err = filepath.Match(e, info.Name())
} else {
excludeMatch, err = filepath.Match(e, path)
}
if err != nil {
return err
}
if excludeMatch {
return nil
}
}
files = append(files, path)
}
}
return nil
})
fileList := strings.Join(files, "\n") + "\n"
writeFileIfChanged(fileListFile, []byte(fileList), 0666)
deptools.WriteDepFile(depFile, fileListFile, dirs)
return
}
func writeFileIfChanged(filename string, data []byte, perm os.FileMode) error {
var isChanged bool
dir := filepath.Dir(filename)
err := os.MkdirAll(dir, 0777)
if err != nil {
return err
}
info, err := os.Stat(filename)
if err != nil {
if os.IsNotExist(err) {
// The file does not exist yet.
isChanged = true
} else {
return err
}
} else {
if info.Size() != int64(len(data)) {
isChanged = true
} else {
oldData, err := ioutil.ReadFile(filename)
if err != nil {
return err
}
if len(oldData) != len(data) {
isChanged = true
} else {
for i := range data {
if oldData[i] != data[i] {
isChanged = true
break
}
}
}
}
}
if isChanged {
err = ioutil.WriteFile(filename, data, perm)
if err != nil {
return err
}
}
return nil
}
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