feat: build commit support on version flag

Makefile

@@ -1,4 +1,5 @@
 BUILD_TIME ?= $(shell date -u '+%Y-%m-%dT%H:%m:%S')
+BUILD_VCS_REF ?= $(shell git rev-parse --short HEAD)
 
 install:
 	@go version
@@ -16,8 +17,12 @@ test:
 build:
 	@go version
 	@go build -v \
-		-ldflags "-s -w -X 'main.version=0.0.0' -X 'main.buildTime=$(BUILD_TIME)'" \
+		-ldflags "-s -w \
+			-X 'main.version=0.0.0' \
+			-X 'main.buildTime=$(BUILD_TIME)' \
+			-X 'main.buildCommit=$(BUILD_VCS_REF)'" \
 		-a -o bin/cline ./examples
+	@ls -ogh bin/cline
 .PHONY: build
 
 coverage:

app_printing.go

@@ -168,6 +168,7 @@ func (app *App) printVersion() error {
 	fmt.Printf("Version:       %s\n", app.Version)
 	fmt.Printf("Go version:    %s\n", runtime.Version())
 	fmt.Printf("Built:         %s\n", app.BuildTime)
+	fmt.Printf("Commit:        %s\n", app.BuildCommit)
 	fmt.Printf("OS/Arch:       %s/%s\n", runtime.GOOS, runtime.GOARCH)
 	return nil
 }

cline.go

@@ -34,13 +34,14 @@ type CmdHandler func(*CmdContext) error
 
 // App defines application settings
 type App struct {
-	Name      string
-	Summary   string
-	Version   string
-	BuildTime string
-	Flags     []Flag
-	Commands  []Cmd
-	Handler   AppHandler
+	Name        string
+	Summary     string
+	Version     string
+	BuildTime   string
+	BuildCommit string
+	Flags       []Flag
+	Commands    []Cmd
+	Handler     AppHandler
 }
 
 // AppContext defines an application context.

examples/main.go

@@ -10,8 +10,9 @@ import (
 // App version and build time values passed at compile time
 // See `Makefile` > build
 var (
-	version   string = "devel"
-	buildTime string
+	version     string = "devel"
+	buildTime   string
+	buildCommit string
 )
 
 func main() {
@@ -20,6 +21,7 @@ func main() {
 	app.Summary = "Run a program in a modified environment using .env files"
 	app.Version = version
 	app.BuildTime = buildTime
+	app.BuildCommit = buildCommit
 	app.Flags = []cli.Flag{
 		cli.FlagString{
 			Name:    "file",