add version flag!

Author: wakeful

release.sh

@@ -3,7 +3,7 @@ set -e
 
 VERSION=$(git describe --tags --dirty)
 GO_BUILD_CMD="go build -a -installsuffix cgo"
-GO_BUILD_LDFLAGS="-s -w"
+GO_BUILD_LDFLAGS="-s -w -X main.version=$VERSION"
 
 BUILD_PLATFORMS="linux darwin"
 BUILD_ARCHS="amd64"

yaml2json.go

@@ -4,11 +4,26 @@ import (
 	"github.com/go-yaml/yaml"
 
 	"encoding/json"
+	"flag"
 	"fmt"
 	"log"
+	"os"
+)
+
+var (
+	showVersion = flag.Bool("version", false, "show version and exit")
+	url         = "https://github.com/wakeful/yaml2json"
+	version     = "dev"
 )
 
 func main() {
+	flag.Parse()
+
+	if *showVersion {
+		fmt.Printf("yaml2json\n url: %s\n version: %s\n", url, version)
+		os.Exit(2)
+	}
+
 	input, err := readInput()
 
 	if err != nil {