version flag

build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+CGO_ENABLED=1 go build -ldflags "-X main.Version=1.2.3 -X main.GitHash=`git rev-parse HEAD` -X main.BuildTime=`date -u '+%Y-%m-%d_%I:%M:%S%p'`"

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
@@ -19,6 +20,15 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+var (
+	// Version is the app's version string
+	Version = "UNKNOWN"
+	// GitHash is the current git hash for this version
+	GitHash = "UNKNOWN"
+	// BuildTime is the time of build of this app
+	BuildTime = "UNKNOWN"
+)
+
 var log = logging.MustGetLogger("myLogger")
 
 var inDir *string
@@ -537,8 +547,16 @@ func main() {
 	createOutDir := flag.Bool("create", false, "create output directory if not existing")
 	//clearOutDir := flag.Bool("clear", false, "clear output directory before generating website")
 	logLevel := flag.String("logLevel", "info", "log level: debug, info, warning, error")
+	version := flag.Bool("version", false, "print version of this executable")
 
 	flag.Parse()
+	if version != nil && *version {
+		fmt.Printf(`%11s: %s
+%11s: %s
+%11s: %s
+`, "version", Version, "git hash", GitHash, "build time", BuildTime)
+		os.Exit(0)
+	}
 
 	logBackend := logging.NewLogBackend(os.Stderr, "", 0)
 	logBackendFormatter := logging.NewBackendFormatter(logBackend, logging.MustStringFormatter(
@@ -556,6 +574,10 @@ func main() {
 			logBackendLevel = logging.INFO
 			break
 
+		case "notice":
+			logBackendLevel = logging.NOTICE
+			break
+
 		case "warning":
 			logBackendLevel = logging.WARNING
 			break