From 5a73cee70adc80ca83dc9b393bee0c122cf84ede Mon Sep 17 00:00:00 2001
From: Ian Byrd <ian@byrd.im>
Date: Mon, 27 Nov 2017 16:19:42 +0200
Subject: [PATCH] Handle() now supports keyboard buttons as endpoints.

---
 bot.go       | 4 +++-
 callbacks.go | 7 ++++++-
 options.go   | 2 +-
 util.go      | 4 ++--
 4 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/bot.go b/bot.go
index b68af4b..520ac22 100644
--- a/bot.go
+++ b/bot.go
@@ -94,6 +94,8 @@ func (b *Bot) Handle(endpoint interface{}, handler interface{}) {
 		b.handlers[end] = handler
 	case CallbackEndpoint:
 		b.handlers["\f"+end.CallbackUnique()] = handler
+	default:
+		panic("telebot: unsupported endpoint")
 	}
 }
 
@@ -380,7 +382,7 @@ func (b *Bot) Send(to Recipient, what interface{}, options ...interface{}) (*Mes
 	case Sendable:
 		return object.Send(b, to, sendOpts)
 	default:
-		panic(fmt.Sprintf("telebot: object %v is not Sendable", object))
+		panic("telebot: unsupported sendable")
 	}
 }
 
diff --git a/callbacks.go b/callbacks.go
index 4575d3d..2f59236 100644
--- a/callbacks.go
+++ b/callbacks.go
@@ -68,7 +68,12 @@ type InlineButton struct {
 	InlineQuery string `json:"switch_inline_query,omitempty"`
 }
 
-// CallbackUnique returns InlineButto.Unique
+// CallbackUnique returns InlineButto.Unique.
 func (t *InlineButton) CallbackUnique() string {
 	return t.Unique
 }
+
+// CallbackUnique returns KeyboardButton.Text.
+func (t *KeyboardButton) CallbackUnique() string {
+	return t.Text
+}
diff --git a/options.go b/options.go
index 3e872ef..eb2c783 100644
--- a/options.go
+++ b/options.go
@@ -91,7 +91,7 @@ type ReplyMarkup struct {
 //
 // Set either Contact or Location to true in order to request
 // sensitive info, such as user's phone number or current location.
-// (Available in private chats only)
+// (Available in private chats only.)
 type KeyboardButton struct {
 	Text string `json:"text"`
 
diff --git a/util.go b/util.go
index 9248c4a..15215dd 100644
--- a/util.go
+++ b/util.go
@@ -2,7 +2,6 @@ package telebot
 
 import (
 	"encoding/json"
-	"fmt"
 	"strconv"
 
 	"github.com/pkg/errors"
@@ -125,7 +124,7 @@ func extractOptions(how []interface{}) *SendOptions {
 			opts.ParseMode = opt
 
 		default:
-			panic(fmt.Sprintf("telebot: %v is not a send-option", opt))
+			panic("telebot: unsupported send-option")
 		}
 	}
 
@@ -160,6 +159,7 @@ func embedSendOptions(params map[string]string, opt *SendOptions) {
 				for j, _ := range keys[i] {
 					key := &keys[i][j]
 					if key.Unique != "" {
+						// Format: "\f<callback_name>|<data>"
 						key.Data = "\f" + key.Unique + "|" + key.Data
 					}
 				}