add build information to `flake-info`

1 files changed, 23 insertions, 1 deletions

diff --git a/cmd/flakeinfo/main.go b/cmd/flakeinfo/main.go
index d41f321..8c1960c 100644
--- a/cmd/flakeinfo/main.go
+++ b/cmd/flakeinfo/main.go
@@ -7,16 +7,38 @@ import (
 	"os"
 	"time"
 
+	"github.com/fcuny/world/internal/version"
 	"github.com/fcuny/world/pkg/flake/lock"
 )
 
+const usage = `Usage:
+    flake-info [flake.lock]
+
+Options:
+    -v, --version     Print version information
+    -h, --help        Print this message
+`
+
 func main() {
-	var flakeLockPath string
+	flag.Usage = func() { fmt.Fprintf(os.Stderr, "%s\n", usage) }
+
+	var (
+		flakeLockPath string
+		versionFlag   bool
+	)
 
 	flag.StringVar(&flakeLockPath, "flake-lock", "flake.lock", "path to the flake lock file")
+	flag.BoolVar(&versionFlag, "version", false, "Print version information")
+	flag.BoolVar(&versionFlag, "v", false, "Print version information")
 
 	flag.Parse()
 
+	if versionFlag {
+		information := version.VersionAndBuildInfo()
+		fmt.Println(information)
+		return
+	}
+
 	if _, err := os.Stat(flakeLockPath); err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			fmt.Fprintf(os.Stderr, "%s does not exists\n", flakeLockPath)