package main

import (
	"bytes"
	"context"
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"path"
	"regexp"
	"strings"
	"time"
)

func main() {
	goPath := strings.TrimSpace(os.Getenv("GOPATH"))
	if goPath == "" {
		println("GOPATH not set")
		return
	}
	pattern, _ := regexp.Compile("[:|;]")
	goPathArr := pattern.Split(goPath, -1)
	for _, item := range goPathArr {
		srcPath := path.Join(item, "src")
		println("Walk in src path", srcPath)
		walk(srcPath)
	}
}

// 目录遍历
func walk(dir string) {
	rd, err := ioutil.ReadDir(dir)
	if nil != err {
		fmt.Printf("ioutil.ReadDir() in walk() returned %v\n", err)
		return
	}
	for _, f := range rd {
		if f == nil {
			println("walk() returned nil FileInfo object")
			return
		}
		if f.IsDir() && strings.Index(f.Name(), ".") != 0 { // 非隐藏目录
			name := path.Join(dir, f.Name())
			if exists(path.Join(name, ".git")) { // 当是git目录时，拉代码更新
				println(name)
				pull(name)
			}
			walk(name) // 递归子目录
		}
	}
}

// 判断文件或目录是否存在
func exists(path string) bool {
	_, err := os.Stat(path)
	if err != nil {
		if os.IsExist(err) {
			return true
		}
		return false
	}
	return true
}

// 更新库
func pull(name string) {
	c := fmt.Sprintf("cd %s && git pull", name)
	ctxt, cancel := context.WithTimeout(context.Background(), 1*time.Minute)
	defer cancel()

	var stdout, stderr bytes.Buffer
	cmd := exec.CommandContext(ctxt, "sh", "-c", c)
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr
	err := cmd.Start()
	if nil != err {
		fmt.Printf("cmd.Start() in pull() returned %v\n", err)
		return
	}
	err = cmd.Wait()
	if nil != err {
		fmt.Printf("cmd.Wait() in pull() returned %v\n", err)
		return
	}
	fmt.Println(stdout.String(), stderr.String())
}