update bee get beego & go version

version.go

@@ -1,11 +1,13 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
-	"log"
-	"os/exec"
-
-	"github.com/astaxie/beego"
+	"io"
+	"os"
+	path "path/filepath"
+	"regexp"
+	"runtime"
 )
 
 var cmdVersion = &Command{
@@ -26,10 +28,52 @@ func init() {
 
 func versionCmd(cmd *Command, args []string) {
 	fmt.Println("bee   :" + version)
-	fmt.Println("beego :" + beego.VERSION)
-	goversion, err := exec.Command("go", "version").Output()
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Println("Go    :" + string(goversion))
+	fmt.Println("beego :" + getbeegoVersion())
+	fmt.Println("Go    :" + runtime.Version())
+}
+
+func getbeegoVersion() string {
+	gopath := os.Getenv("GOPATH")
+	re, err := regexp.Compile(`const VERSION = "([0-9.]+)"`)
+	if err != nil {
+		return ""
+	}
+	if gopath == "" {
+		err = fmt.Errorf("you should set GOPATH in the env")
+		return ""
+	}
+	wgopath := path.SplitList(gopath)
+	for _, wg := range wgopath {
+		wg, _ = path.EvalSymlinks(path.Join(wg, "src", "github.com", "astaxie", "beego"))
+		filename := path.Join(wg, "beego.go")
+		_, err := os.Stat(filename)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
+			ColorLog("[ERRO] get beego.go has error\n")
+		}
+		fd, err := os.Open(filename)
+		if err != nil {
+			ColorLog("[ERRO] open beego.go has error\n")
+			continue
+		}
+		reader := bufio.NewReader(fd)
+		for {
+			byteLine, _, er := reader.ReadLine()
+			if er != nil && er != io.EOF {
+				return ""
+			}
+			if er == io.EOF {
+				break
+			}
+			line := string(byteLine)
+			s := re.FindStringSubmatch(line)
+			if len(s) >= 2 {
+				return s[1]
+			}
+		}
+
+	}
+	return "you don't install beego,install first: github.com/astaxie/beego"
 }