include version

.travis.yml

@@ -12,7 +12,6 @@ before_install:
   - go get github.com/tcnksm/ghr
 after_success:
   - make clean
-  - GOOS=linux CC=arm-linux-gnueabihf-gcc GOOS=linux GOARCH=arm CGO_ENABLED=1 go build -v -o dist/linux_arm_mpdbot/mpdbot ./cmd/mpdbot
-  - CGO_ENABLED=1 go build -v -o dist/linux_amd64_mpdbot/mpdbot ./cmd/mpdbot
+  - make build-release
   - for i in $(find dist -mindepth 1 -maxdepth 1 -type d); do cp {README.md,config.yml} $i; tar -czf "$i".tar.gz -C "$i" "."; done
   - if [ "$TRAVIS_TAG" != "" ]; then ghr --username fulhax --token $GITHUB_TOKEN --replace $TRAVIS_TAG dist/; fi

Makefile

@@ -1,6 +1,10 @@
 exe = ./cmd/mpdbot
 
-.PHONY: all build install test deps 
+VERSION = `git describe --tags`
+BUILD_DATE=`date +%FT%T%z`
+LDFLAGS=-ldflags "-w -s -X main.Version=${VERSION} -X main.BuildDate=${BUILD_DATE}"
+
+.PHONY: all build build-release install test deps 
 
 all: test clean build
 
@@ -13,6 +17,10 @@ clean:
 build:
 	go build -v -o dist/mpdbot $(exe)
 
+build-release:
+	GOOS=linux CC=arm-linux-gnueabihf-gcc GOOS=linux GOARCH=arm CGO_ENABLED=1 go build -v ${LDFLAGS} -o dist/linux_arm_mpdbot/mpdbot ./cmd/mpdbot
+	CGO_ENABLED=1 go build -v ${LDFLAGS} -o dist/linux_amd64_mpdbot/mpdbot ./cmd/mpdbot
+
 install:
 	go install $(exe)
 

cmd/mpdbot/mpdbot.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
 
 	"github.com/fulhax/mpdbot/handler"
 	"github.com/fulhax/mpdbot/irccmd"
@@ -33,6 +34,8 @@ var (
 	mpdClient    *mpd.MpdClient
 	stats        statistics.Storage
 	config       mpdbotConfig
+	BuildDate    string
+	Version      string
 )
 
 func serveHTTP() {
@@ -86,6 +89,13 @@ func initConfig() {
 }
 
 func main() {
+	if Version != "" && BuildDate != "" {
+		flag.Usage = func() {
+			fmt.Fprintf(os.Stderr, "Usage of %s (%s %s):\n", os.Args[0], Version, BuildDate)
+			flag.PrintDefaults()
+		}
+	}
+
 	initConfig()
 
 	var err error