print version

Makefile

@@ -1,13 +1,15 @@
+VERSION := $(shell git describe --tags)
 
 run:
 	go run .
 
 build:
+	@echo "Version: " $(VERSION)
 	-mkdir build
-	cd build; GOOS=linux GOARCH=arm go build -o gdu-linux-arm ..; tar czf gdu-linux-arm.tgz gdu-linux-arm
-	cd build; GOOS=linux GOARCH=amd64 go build -o gdu-linux-amd64 ..; tar czf gdu-linux-amd64.tgz gdu-linux-amd64
-	cd build; GOOS=windows GOARCH=amd64 go build -o gdu-windows-amd64.exe ..; zip gdu-windows-amd64.zip gdu-windows-amd64.exe
-	cd build; GOOS=darwin GOARCH=amd64 go build -o gdu-darwin-amd64 ..; tar czf gdu-darwin-amd64.tgz gdu-darwin-amd64
+	cd build; GOOS=linux GOARCH=arm go build -ldflags="-s -w -X 'main.AppVersion=$(VERSION)'" -o gdu-linux-arm ..; tar czf gdu-linux-arm.tgz gdu-linux-arm
+	cd build; GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X 'main.AppVersion=$(VERSION)'" -o gdu-linux-amd64 ..; tar czf gdu-linux-amd64.tgz gdu-linux-amd64
+	cd build; GOOS=windows GOARCH=amd64 go build -ldflags="-s -w -X 'main.AppVersion=$(VERSION)'" -o gdu-windows-amd64.exe ..; zip gdu-windows-amd64.zip gdu-windows-amd64.exe
+	cd build; GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w -X 'main.AppVersion=$(VERSION)'" -o gdu-darwin-amd64 ..; tar czf gdu-darwin-amd64.tgz gdu-darwin-amd64
 
 test:
 	go test -v

main.go

@@ -2,17 +2,27 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"log"
 	"os"
 	"runtime"
 
 	"github.com/gdamore/tcell/v2"
 )
 
+// AppVersion stores the current version of the app
+var AppVersion = "development"
+
 func main() {
 	logFile := flag.String("log-file", "/dev/null", "Path to a logfile")
+	showVersion := flag.Bool("v", false, "Prints version")
 	flag.Parse()
 
+	if *showVersion {
+		fmt.Println("Version:\t", AppVersion)
+		return
+	}
+
 	f, err := os.OpenFile(*logFile, os.O_RDWR|os.O_CREATE, 0644)
 	if err != nil {
 		log.Fatalf("error opening file: %v", err)