Merge pull request #15 from kyoshidajp/add_version_option

Add version option

Makefile

@@ -3,7 +3,7 @@ INTERNAL_BIN_DIR=_internal_bin
 GOVERSION=$(shell go version)
 GOOS=$(word 1,$(subst /, ,$(lastword $(GOVERSION))))
 GOARCH=$(word 2,$(subst /, ,$(lastword $(GOVERSION))))
-VERSION=$(patsubst "%",%,$(lastword $(shell grep 'const version' main.go)))
+VERSION=$(patsubst "%",%,$(lastword $(shell grep 'const Version' main.go)))
 RELEASE_DIR=releases
 ARTIFACTS_DIR=$(RELEASE_DIR)/artifacts/$(VERSION)
 SRC_FILES = $(wildcard *.go)

cli.go

@@ -67,6 +67,7 @@ func (c *CLI) Run(args []string) int {
 		url     bool
 		apiurl  bool
 		newline bool
+		version bool
 	)
 	flags := flag.NewFlagSet(args[0], flag.ContinueOnError)
 	flags.Usage = func() {
@@ -80,6 +81,8 @@ func (c *CLI) Run(args []string) int {
 	flags.BoolVar(&apiurl, "a", false, "")
 	flags.BoolVar(&newline, "newline", true, "")
 	flags.BoolVar(&newline, "n", true, "")
+	flags.BoolVar(&version, "version", true, "")
+	flags.BoolVar(&version, "v", true, "")
 
 	// Parse flag
 	if err := flags.Parse(args[1:]); err != nil {
@@ -91,6 +94,11 @@ func (c *CLI) Run(args []string) int {
 		Debugf("Run as DEBUG mode")
 	}
 
+	if version {
+		fmt.Fprintf(c.outStream, fmt.Sprintf("%s\n", Version))
+		return ExitCodeOK
+	}
+
 	parsedArgs := flags.Args()
 	if len(parsedArgs) != 1 {
 		PrintErrorf("Invalid argument: you must set sha.")
@@ -278,4 +286,6 @@ Options:
                  Print debug log.
 
   -h, --help     Show this help message and exit.
+
+  -v, --version  Print current version.
 `

main.go

@@ -2,7 +2,7 @@ package main
 
 import "os"
 
-const version = "0.0.2"
+const Version string = "0.0.2"
 
 func main() {
 	cli := &CLI{outStream: os.Stdout, errStream: os.Stderr}