add print version

start.go

@@ -4,6 +4,7 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"log"
 	"os"
 	"strings"
@@ -14,6 +15,10 @@ import (
 	"github.com/ztrue/tracerr"
 )
 
+const VERSION = "v1.3.1"
+
+var gomu *Gomu
+
 // created so we can keep track of childrens in slices
 type Panel interface {
 	HasFocus() bool
@@ -122,11 +127,13 @@ func (g *Gomu) SetUnfocusPanel(panel Panel) {
 	g.PrevPanel.SetTitleColor((g.TextColor))
 }
 
-// one single instance of global variable
-var gomu *Gomu
-
 func start(application *tview.Application, args Args) {
 
+	if *args.version {
+		fmt.Printf("Gomu %s\n", VERSION)
+		return
+	}
+
 	// override default border
 	// change double line border to one line border when focused
 	tview.Borders.HorizontalFocus = tview.Borders.Horizontal
@@ -301,6 +308,7 @@ type Args struct {
 	config  *string
 	load    *bool
 	music   *string
+	version *bool
 }
 
 func getArgs() Args {
@@ -309,6 +317,7 @@ func getArgs() Args {
 		config:  flag.String("config", "~/.config/gomu/config", "specify config file"),
 		load:    flag.Bool("load", true, "load previous queue"),
 		music:   flag.String("music", "~/music", "specify music directory"),
+		version: flag.Bool("version", false, "print gomu version"),
 	}
 
 	flag.Parse()