show commit and date in version command

Makefile

@@ -3,6 +3,13 @@ NAME       := cloudlens
 OUTPUT_BIN ?= execs/${NAME}
 PACKAGE    := github.com/one2nc/$(NAME)
 VERSION    = v0.1.0
+GIT_REV    ?= $(shell git rev-parse --short HEAD)
+SOURCE_DATE_EPOCH ?= $(shell date +%s)
+ifeq ($(shell uname), Darwin)
+DATE       ?= $(shell TZ=UTC date -j -f "%s" ${SOURCE_DATE_EPOCH} +"%Y-%m-%dT%H:%M:%SZ")
+else
+DATE       ?= $(shell date -u -d @${SOURCE_DATE_EPOCH} +"%Y-%m-%dT%H:%M:%SZ")
+endif
 
 setup:
 	docker-compose up -d
@@ -12,7 +19,7 @@ setup-down:
 
 build:
 	go build ${GO_FLAGS} \
-	-ldflags "-w -s -X ${PACKAGE}/cmd.version=${VERSION}" \
+	-ldflags "-w -s -X ${PACKAGE}/cmd.version=${VERSION} -X ${PACKAGE}/cmd.commit=${GIT_REV} -X ${PACKAGE}/cmd.date=${DATE}" \
 	-a -tags netgo -o ${OUTPUT_BIN} main.go
 
 run: build

cmd/root.go

@@ -19,7 +19,9 @@ import (
 
 var (
 	profile, region string
-	version         = ""
+	version         = "dev"
+	commit          = "dev"
+	date            = "today"
 	rootCmd         = &cobra.Command{
 		Use:   `cloudlens`,
 		Short: `cli for aws services`,

cmd/version.go

@@ -32,8 +32,8 @@ func printVersion(short bool) {
 		outputColor = -1
 	}
 	printTuple(fmat, "Version", version, outputColor)
-	// printTuple(fmat, "Commit", commit, outputColor)
-	// printTuple(fmat, "Date", date, outputColor)
+	printTuple(fmat, "Commit", commit, outputColor)
+	printTuple(fmat, "Date", date, outputColor)
 }
 
 func printTuple(fmat, section, value string, outputColor color.Paint) {