feat: Add version flag

Add version flag (-v, --version) that displays version and commit SHA.
Add utility function to format version information for consistent display
across the application.

Author: epilande

cmd/grab/main.go

@@ -14,6 +14,7 @@ import (
 	"github.com/epilande/codegrab/internal/model"
 	"github.com/epilande/codegrab/internal/ui"
 	"github.com/epilande/codegrab/internal/ui/themes"
+	"github.com/epilande/codegrab/internal/utils"
 )
 
 type stringSliceFlag []string
@@ -32,6 +33,7 @@ func main() {
 
 	var globPatterns stringSliceFlag
 	var showHelp bool
+	var showVersion bool
 	var nonInteractive bool
 	var outputPath string
 	var useTempFile bool
@@ -41,6 +43,9 @@ func main() {
 	flag.BoolVar(&showHelp, "help", false, "Display help information")
 	flag.BoolVar(&showHelp, "h", false, "Display help information (shorthand)")
 
+	flag.BoolVar(&showVersion, "version", false, "Display version information")
+	flag.BoolVar(&showVersion, "v", false, "Display version information (shorthand)")
+
 	flag.BoolVar(&nonInteractive, "non-interactive", false, "Run in non-interactive mode")
 	flag.BoolVar(&nonInteractive, "n", false, "Run in non-interactive mode (shorthand)")
 
@@ -71,6 +76,11 @@ func main() {
 		os.Exit(0)
 	}
 
+	if showVersion {
+		fmt.Println(utils.VersionInfo())
+		os.Exit(0)
+	}
+
 	if themeName != "" {
 		if err := themes.SetTheme(themeName); err != nil {
 			fmt.Fprintf(os.Stderr, "Warning: %v, using default theme\n", err)

internal/utils/version.go

@@ -0,0 +1,10 @@
+package utils
+
+var (
+	Version   = "dev"
+	CommitSHA = "unknown"
+)
+
+func VersionInfo() string {
+	return "grab " + Version + " (" + CommitSHA + ")"
+}