options: implement message entities option

message.go

@@ -267,6 +267,9 @@ type MessageEntity struct {
 	Language string `json:"language,omitempty"`
 }
 
+// Entities is used to set message's text entities as a send option.
+type Entities []MessageEntity
+
 // AutoDeleteTimer represents a service message about a change in auto-delete timer settings.
 type AutoDeleteTimer struct {
 	Unixtime int `json:"message_auto_delete_time"`

options.go

@@ -66,6 +66,9 @@ type SendOptions struct {
 	// ParseMode controls how client apps render your message.
 	ParseMode ParseMode
 
+	// Entities is a list of special entities that appear in message text, which can be specified instead of parse_mode.
+	Entities Entities
+
 	// DisableContentDetection abilities to disable server-side file content type detection.
 	DisableContentDetection bool
 

util.go

@@ -178,6 +178,11 @@ func extractOptions(how []interface{}) *SendOptions {
 				opts = &SendOptions{}
 			}
 			opts.ParseMode = opt
+		case Entities:
+			if opts == nil {
+				opts = &SendOptions{}
+			}
+			opts.Entities = opt
 		default:
 			panic("telebot: unsupported send-option")
 		}
@@ -211,6 +216,15 @@ func (b *Bot) embedSendOptions(params map[string]string, opt *SendOptions) {
 		params["parse_mode"] = opt.ParseMode
 	}
 
+	if len(opt.Entities) > 0 {
+		entities, _ := json.Marshal(opt.Entities)
+		if params["caption"] != "" {
+			params["caption_entities"] = string(entities)
+		} else {
+			params["entities"] = string(entities)
+		}
+	}
+
 	if opt.DisableContentDetection {
 		params["disable_content_type_detection"] = "true"
 	}