feat: description also for root command

README.md

@@ -21,8 +21,15 @@ But for easy to use you should move the `toolbx` binary somewhere in your `PATH`
 
 When you installed `toolbx` binary, as second step is configuration of your 
 command repository. It's repository where are all commands and subcommands 
-defined. You can use `toolbx-demo` repository.
+defined. You can use `toolbx-demo` repository:
 
 ```
-echo "repository: https://github.com/sn3d/toolbx-demo.git" > ~/.toolbx.yaml
+$ echo "repository: https://github.com/sn3d/toolbx-demo.git" > ~/.toolbx.yaml
 ```
+
+Now you can start using `toolbx`. If you run subcommand `toolbx storage`, you
+should be synchronized with command repository, and you should get 
+the list of all `storage` subcommands.
+```
+$ toolbx storage
+```

repo_commands.go

@@ -29,7 +29,7 @@ func (repo *CommandsRepository) GetCommand(args []string) (*api.Command, error)
 
 	subCmd, err := getSubCommand(rootCmd, args)
 	if errors.Is(err, NoChildError) {
-		return rootCmd, nil
+		subCmd = rootCmd
 	}
 
 	err = loadMetadata(subCmd)

toolbx.go

@@ -25,13 +25,21 @@ type Toolbx struct {
 
 func Main(options ...ToolbxOption) error {
 	tlbx, err := Create(options...)
-	if err != nil {
-		log.Fatalln("error starting toolbx", err)
+	if err == MissingRepoError {
+		fmt.Println("Hello, and welcome!")
+		fmt.Println("")
+		fmt.Println("Do one simple configuration step before you start using Toolbx:")
+		fmt.Println("")
+		fmt.Println("    echo \"repository: https://github.com/sn3d/toolbx-demo.git\" > ~/.toolbx.yaml")
+		fmt.Println("")
+		return nil
+	} else if err != nil {
+		log.Fatalln("error starting toolbx:", err)
 	}
 
 	err = tlbx.Execute(os.Args)
 	if err != nil {
-		log.Fatalln("error executing command", err)
+		log.Fatalln("error executing command:", err)
 	}
 
 	return nil
@@ -96,9 +104,11 @@ func (t *Toolbx) Execute(args []string) error {
 		}
 
 		if len(cmd.Args) > 0 {
-			fmt.Printf("Unknown sub-command '%s' in %v\n", cmd.Args[0], cmd.Args)
+			fmt.Printf("Unknown sub-command '%s'\n", cmd.Args[0])
 		}
 
+		fmt.Printf("\n%s\n", cmd.Metadata.Description)
+
 		d := color.New(color.FgHiWhite, color.Bold)
 		d.Printf("\nAvailable sub-commands for %s\n\n", name)