layout: add shorter data alias for callback_data

layout/example.yml

@@ -22,7 +22,16 @@ buttons:
   stop:
     unique: stop
     text: Stop
-    callback_data: '{{.}}'
+    data: '{{.}}'
+
+  # Callback data
+  pay:
+    unique: pay
+    text: Pay
+    data:
+      - '{{.UserID}}'
+      - '{{.Amount}}'
+      - '{{.Currency}}'
 
 markups:
   reply_shortened:

layout/layout_test.go

@@ -45,4 +45,18 @@ func TestLayout(t *testing.T) {
 	assert.Equal(t, &tele.ReplyMarkup{
 		InlineKeyboard: [][]tele.InlineButton{{{Unique: "stop", Text: "Stop", Data: "1"}}},
 	}, lt.MarkupLocale("en", "inline", 1))
+
+	assert.Equal(t, &tele.Btn{
+		Unique: "pay",
+		Text:   "Pay",
+		Data:   "1|100.00|USD",
+	}, lt.ButtonLocale("en", "pay", struct {
+		UserID   int
+		Amount   string
+		Currency string
+	}{
+		UserID:   1,
+		Amount:   "100.00",
+		Currency: "USD",
+	}))
 }

layout/settings.go

@@ -78,12 +78,29 @@ func (lt *Layout) UnmarshalYAML(data []byte) error {
 			return err
 		}
 
-		var btn Button
+		var btn struct {
+			Button `yaml:",inline"`
+			Data   interface{} `json:"data"`
+		}
 		if err := yaml.Unmarshal(data, &btn); err != nil {
 			return err
 		}
 
-		lt.buttons[k] = btn
+		if btn.Data != nil {
+			if a, ok := btn.Data.([]interface{}); ok {
+				s := make([]string, len(a))
+				for i, v := range a {
+					s[i] = fmt.Sprint(v)
+				}
+				btn.Button.Data = strings.Join(s, "|")
+			} else if s, ok := btn.Data.(string); ok {
+				btn.Button.Data = s
+			} else {
+				return fmt.Errorf("telebot/layout: invalid callback_data for %s button", k)
+			}
+		}
+
+		lt.buttons[k] = btn.Button
 	}
 
 	lt.markups = make(map[string]Markup, len(aux.Markups))