feat(golang-rewrite): update cmd code to use urfave/cli

cmd/main.go

@@ -1,37 +1,33 @@
 package cmd
 
 import (
-	"fmt"
+	"log"
 	"os"
 
-	"github.com/spf13/cobra"
+	"github.com/urfave/cli/v2"
 )
 
-var rootCmd = &cobra.Command{
-	Use:   "asdf",
-	Short: "The multiple runtime version manager",
-	Long: `The Multiple Runtime Version Manager.
+func Execute() {
+	app := &cli.App{
+		Name:    "asdf",
+		Version: "0.1.0",
+		Usage:   "The multiple runtime version manager",
+		UsageText: `The Multiple Runtime Version Manager.
 
 Manage all your runtime versions with one tool!
 
 Complete documentation is available at https://asdf-vm.com/`,
-	Run: func(cmd *cobra.Command, args []string) {
-		// TODO: Flesh this out
-		fmt.Println("Late but latest -- Rajinikanth")
-	},
-}
-
-func init() {
-	// TODO: Add flags relevant to all commands
-	//rootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
+		Action: func(cCtx *cli.Context) error {
+			// TODO: flesh this out
+			log.Print("Late but latest -- Rajinikanth")
+			return nil
+		},
+	}
 
-	// TODO: Add sub commands
-	//rootCmd.AddCommand(pluginCmd)
-}
+	err := app.Run(os.Args)
 
-func Execute() {
-	if err := rootCmd.Execute(); err != nil {
-		fmt.Println(err)
+	if err != nil {
 		os.Exit(1)
+		log.Fatal(err)
 	}
 }