check the gopath before start

main.go

@@ -1,10 +1,11 @@
 package main
 
 import (
+	"fmt"
 	r "github.com/tockins/realize/realize"
 	"gopkg.in/urfave/cli.v2"
+	"log"
 	"os"
-	"fmt"
 	"strings"
 )
 
@@ -20,8 +21,13 @@ func main() {
 		return nil
 	}
 
-	header := func() {
+	header := func() error {
 		app.Information()
+		gopath := os.Getenv("GOPATH")
+		if gopath == "" {
+			log.Fatal(r.Red("$GOPATH isn't set up properly"))
+		}
+		return nil
 	}
 
 	wd := func() string {
@@ -38,7 +44,7 @@ func main() {
 		Name:    app.Name,
 		Version: app.Version,
 		Authors: []*cli.Author{
-			&cli.Author{
+			{
 				Name:  app.Author,
 				Email: app.Email,
 			},