122 lines
2.1 KiB
Go
122 lines
2.1 KiB
Go
// Copyright 2013 <chaishushan{AT}gmail.com>. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ingore
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//
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// Cacl dir or file MD5Sum, support regexp.
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//
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// Example:
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// md5 file
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// md5 dir "\.go$"
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// md5 dir "\.tiff?$"
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// md5 dir "\.tiff?|jpg|jpeg$"
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//
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// Help:
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// cpdir -h
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//
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package main
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import (
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"crypto/md5"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"regexp"
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"sort"
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)
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const usage = `
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Usage: md5 [dir|file [filter]]
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md5 -h
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Example:
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md5 file
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md5 dir "\.go$"
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md5 dir "\.go$"
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md5 dir "\.tiff?$"
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md5 dir "\.tiff?|jpg|jpeg$"
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Report bugs to <chaishushan{AT}gmail.com>.
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`
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func main() {
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if len(os.Args) < 2 {
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fmt.Fprintln(os.Stderr, usage[1:len(usage)-1])
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os.Exit(0)
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}
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filter := ".*"
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if len(os.Args) > 2 {
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filter = os.Args[2]
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}
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if name := os.Args[1]; IsDir(name) {
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m, err := MD5Dir(name, filter)
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if err != nil {
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log.Fatalf("%s: %v", name, err)
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}
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var paths []string
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for path := range m {
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paths = append(paths, path)
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}
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sort.Strings(paths)
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for _, path := range paths {
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fmt.Printf("%x *%s\n", m[path], path)
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}
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} else {
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sum, err := MD5File(name)
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if err != nil {
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log.Fatalf("%s: %v", name, err)
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}
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fmt.Printf("%x *%s\n", sum, name)
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}
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}
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func IsDir(name string) bool {
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fi, err := os.Lstat(name)
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if err != nil {
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log.Fatal(err)
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}
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return fi.IsDir()
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}
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func MD5Dir(root string, filter string) (map[string][md5.Size]byte, error) {
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m := make(map[string][md5.Size]byte)
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err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if info.IsDir() {
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return nil
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}
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mathed, err := regexp.MatchString(filter, path)
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if err != nil {
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log.Fatal("regexp.MatchString: ", err)
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}
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if mathed {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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m[path] = md5.Sum(data)
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return m, nil
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}
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func MD5File(filename string) (sum [md5.Size]byte, err error) {
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data, err := ioutil.ReadFile(filename)
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if err != nil {
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return
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}
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sum = md5.Sum(data)
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return
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}
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