add phonetic explanation

cmd/nourybot/commands.go

@@ -62,6 +62,11 @@ func (app *Application) ParseCommand(evt *event.Event) {
 		}
 
 	case "phonetic":
+		if msgLen == 1 {
+			resp := commands.PhoneticExplanation()
+			app.SendText(evt, resp)
+			return
+		} else {
 			msg := evt.Content.AsMessage().Body[9:len(evt.Content.AsMessage().Body)]
 			if resp, err := commands.Phonetic(msg); err != nil {
 				app.Log.Error().Err(err).Msg("failed to handle phonetic command")
@@ -71,6 +76,7 @@ func (app *Application) ParseCommand(evt *event.Event) {
 				app.SendText(evt, resp)
 				return
 			}
+		}
 
 	case "ping":
 		if resp, err := commands.Ping(); err != nil {

internal/commands/phonetic.go

@@ -73,6 +73,18 @@ var cm = map[string]string{
 	"M": "М",
 }
 
+func PhoneticExplanation() string {
+	// This might look like complete ass depending on the
+	// matrix clients font. Looks fine on my Element client.
+	help := `
+| Ё | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | Ъ |
+     | Я | Ш | Е | Р | Т | Ы | У | И | О | П | Ю | Щ | Э |
+       | А | С | Д | Ф | Г | Ч | Й | К | Л | Ь | Ж |
+           | З | Х | Ц | В | Б | Н | М | ; | : |
+	`
+	return help
+}
+
 func Phonetic(message string) (string, error) {
 	var ts string