Added version flag

Makefile

@@ -1,6 +1,6 @@
 BINARY_NAME := guesswidth
 SRCS := $(shell git ls-files '*.go')
-LDFLAGS := "-X main.version=$(shell git describe --tags --abbrev=0 --always) -X main.revision=$(shell git rev-parse --short HEAD)"
+LDFLAGS := "-X github.com/noborus/guesswidth.version=$(shell git describe --tags --abbrev=0 --always) -X github.com/noborus/guesswidth.revision=$(shell git rev-parse --short HEAD)"
 
 all: build
 

cmd/root.go

@@ -14,6 +14,7 @@ var rootCmd = &cobra.Command{
 	Short: "Guess the width of the column and split it",
 	Long: `Guess the width of the columns from the header and body,
 split them, insert fences and output.`,
+	Version: guesswidth.Version(),
 	Run: func(cmd *cobra.Command, args []string) {
 		writeTable(args)
 	},

guesswidth.go

@@ -9,6 +9,7 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"runtime/debug"
 	"strings"
 	"unicode"
 
@@ -285,3 +286,19 @@ func debugCountPrint(line string, blanks []int) {
 	}
 	fmt.Println()
 }
+
+var (
+	version  string
+	revision string
+)
+
+func Version() string {
+	if version != "" {
+		return version + " rev:" + revision
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "(devel)"
+	}
+	return info.Main.Version
+}