[Golang] Convert Traditional Chinese PO file to Simplified Chinese

$ sudo apt-get install opencc libopencc-dev
$ go get -u github.com/siongui/go-opencc

package main

import (
      "bufio"
      "fmt"
      "github.com/siongui/go-opencc"
      "os"
      "path/filepath"
      "strings"
)

var ct2s = opencc.NewConverter("zht2zhs.ini")

func File2lines(filePath string) []string {
      f, err := os.Open(filePath)
      if err != nil {
              panic(err)
      }
      defer f.Close()

      var lines []string
      scanner := bufio.NewScanner(f)
      for scanner.Scan() {
              lines = append(lines, scanner.Text())
      }
      if err := scanner.Err(); err != nil {
              fmt.Fprintln(os.Stderr, err)
              panic(err)
      }

      return lines
}

func main() {
      twPOPath := "locale/zh_TW/LC_MESSAGES/messages.po"
      cnPOPath := "locale/zh_CN/LC_MESSAGES/messages.po"
      defer ct2s.Close()

      os.MkdirAll(filepath.Dir(cnPOPath), 0755)
      fo, err := os.Create(cnPOPath)
      if err != nil {
              fmt.Fprintln(os.Stderr, err)
              panic(err)
      }
      defer fo.Close()

      for _, line := range File2lines(twPOPath) {
              if strings.HasPrefix(line, "msgstr") {
                      fo.Write([]byte(ct2s.Convert(line)))
              } else {
                      if strings.Contains(line, "zh_TW") {
                              fo.Write([]byte(strings.Replace(line, "zh_TW", "zh_CN", 1)))
                      } else {
                              fo.Write([]byte(line))
                      }
              }
              fo.Write([]byte("\n"))
      }
}