Add "respond as reply" functionality

Signed-off-by: Knut Ahlers <knut@ahlers.me>

action_respond.go

@@ -21,14 +21,26 @@ func init() {
 			}
 		}
 
+		ircMessage := &irc.Message{
+			Command: "PRIVMSG",
+			Params: []string{
+				m.Params[0],
+				msg,
+			},
+		}
+
+		if r.RespondAsReply != nil && *r.RespondAsReply {
+			id, ok := m.GetTag("id")
+			if ok {
+				if ircMessage.Tags == nil {
+					ircMessage.Tags = make(irc.Tags)
+				}
+				ircMessage.Tags["reply-parent-msg-id"] = irc.TagValue(id)
+			}
+		}
+
 		return errors.Wrap(
-			c.WriteMessage(&irc.Message{
-				Command: "PRIVMSG",
-				Params: []string{
-					m.Params[0],
-					msg,
-				},
-			}),
+			c.WriteMessage(ircMessage),
 			"sending response",
 		)
 	})

rule.go

@@ -305,6 +305,7 @@ type ruleAction struct {
 	RawMessage *string `json:"raw_message" yaml:"raw_message"`
 
 	Respond         *string `json:"respond" yaml:"respond"`
+	RespondAsReply  *bool   `json:"respond_as_reply" yaml:"respond_as_reply"`
 	RespondFallback *string `json:"respond_fallback" yaml:"respond_fallback"`
 
 	Timeout *time.Duration `json:"timeout" yaml:"timeout"`

wiki/Home.md

@@ -62,6 +62,7 @@ rules: # See below for examples
 
     # Send responding message to the channel the original message was received in
     - respond: 'Hello chatter'    # String, applies templating
+      respond_as_reply: true      # Boolean, optional, use Twitch-Reply feature in respond
       respond_fallback: 'Oh noes' # String, text to send if the template function causes
                                   # an error, applies templating (default: unset)