feat: add version flag to CLI

internal/cli/root.go

@@ -2,12 +2,15 @@ package cli
 
 import (
 	"github.com/spf13/cobra"
+
+	"github.com/kernelshard/expose/internal/version"
 )
 
 var rootCmd = &cobra.Command{
-	Use:   "expose",
-	Short: "Expose localhost to the internet",
-	Long:  "Minimal CLI to expose your local dev server",
+	Use:     "expose",
+	Short:   "Expose localhost to the internet",
+	Long:    "Minimal CLI to expose your local dev server",
+	Version: version.GetFullVersion(),
 }
 
 func Execute() error {

internal/version/version.go

@@ -0,0 +1,21 @@
+package version
+
+var (
+	Version   = "v0.1.1"
+	GitCommit = "4784595"
+	BuildDate = "2025-11-07"
+)
+
+// GetVersion returns just the version string
+func GetVersion() string {
+	if Version == "dev" {
+		return "dev (unreleased)"
+	}
+	return Version
+}
+
+// GetFullVersion returns version with build metadata (for Cobra)
+// Note: Cobra automatically prefixes with "expose version"
+func GetFullVersion() string {
+	return GetVersion() + " (commit: " + GitCommit + ", built: " + BuildDate + ")"
+}

internal/version/version_test.go

@@ -0,0 +1,23 @@
+package version
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGetVersion(t *testing.T) {
+	v := GetVersion()
+	if !strings.Contains(v, Version) {
+		t.Errorf("GetVersion mismatch expected %s in:%s", Version, v)
+	}
+}
+
+func TestGetFullVersion(t *testing.T) {
+	fullVersion := GetFullVersion()
+	if !strings.Contains(fullVersion, GitCommit) {
+		t.Errorf("GetFullVersion call expected %s in %s", GitCommit, fullVersion)
+	}
+	if !strings.Contains(fullVersion, BuildDate) {
+		t.Errorf("GetFullVersion call expected %s in %s", BuildDate, fullVersion)
+	}
+}