feat(cli): add --version flag (#29)

cmd/rp/cmd/root.go

@@ -1,31 +1,45 @@
 package cmd
 
 import (
+	"fmt"
 	"log/slog"
 	"os"
+	"runtime/debug"
 
 	"github.com/spf13/cobra"
 )
 
 var logger *slog.Logger
 
-// rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
 	Use:     "releaser-pleaser",
-	Short: "A brief description of your application",
-	Long: `A longer description that spans multiple lines and likely contains
-examples and usage of using your application. For example:
-
-Cobra is a CLI library for Go that empowers applications.
-This application is a tool to generate the needed files
-to quickly create a Cobra application.`,
-	// Uncomment the following line if your bare application
-	// has an action associated with it:
-	// Run: func(cmd *cobra.Command, args []string) { },
+	Short:   "",
+	Long:    ``,
+	Version: version(),
+}
+
+func version() string {
+	vcsrevision := "unknown"
+	vcsdirty := ""
+
+	buildInfo, ok := debug.ReadBuildInfo()
+	if ok {
+		fmt.Println(buildInfo.String())
+		for _, setting := range buildInfo.Settings {
+			switch setting.Key {
+			case "vcs.revision":
+				vcsrevision = setting.Value
+			case "vcs.modified":
+				if setting.Value == "true" {
+					vcsdirty = " (dirty)"
+				}
+			}
+		}
+	}
+
+	return vcsrevision + vcsdirty
 }
 
-// Execute adds all child commands to the root command and sets flags appropriately.
-// This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
 	err := rootCmd.Execute()
 	if err != nil {
@@ -38,13 +52,4 @@ func init() {
 		Level: slog.LevelDebug,
 	}))
 
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-
-	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.releaser-pleaser.yaml)")
-
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
-	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 }

cmd/rp/cmd/run.go

@@ -8,7 +8,6 @@ import (
 	rp "github.com/apricote/releaser-pleaser"
 )
 
-// runCmd represents the run command
 var runCmd = &cobra.Command{
 	Use:  "run",
 	RunE: run,
@@ -25,8 +24,6 @@ var (
 func init() {
 	rootCmd.AddCommand(runCmd)
 
-	// Here you will define your flags and configuration settings.
-
 	runCmd.PersistentFlags().StringVar(&flagForge, "forge", "", "")
 	runCmd.PersistentFlags().StringVar(&flagBranch, "branch", "main", "")
 	runCmd.PersistentFlags().StringVar(&flagOwner, "owner", "", "")