irc: add support of TAGMSG messages (issue #1654)

ChangeLog.adoc

@@ -21,6 +21,7 @@ https://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 New features::
 
   * core: add option "certs" in command /debug
+  * irc: add support of TAGMSG messages (issue #1654)
   * irc: enable all capabilities by default (if supported by server and WeeChat), change default value of option irc.server_default.capabilities to "*" (issue #320)
   * irc: add options irc.look.display_account_message and irc.look.display_extended_join (issue #320)
   * irc: add command /setname, add support of message and capability "setname" (issue #1653)

src/plugins/irc/irc-protocol.c

@@ -2903,6 +2903,22 @@ IRC_PROTOCOL_CALLBACK(setname)
     return WEECHAT_RC_OK;
 }
 
+/*
+ * Callback for the IRC message "SETNAME": set real name
+ * (with capability "setname").
+ *
+ * Message looks like:
+ *   @msgid=6gqz7dxd22v7r3x9pvukkp8nni;+tag1 :nick!user@host TAGMSG #channel
+ */
+
+IRC_PROTOCOL_CALLBACK(tagmsg)
+{
+    IRC_PROTOCOL_MIN_ARGS(3);
+
+    /* no action by default */
+    return WEECHAT_RC_OK;
+}
+
 /*
  * Callback for an IRC message with mode and reason (numeric).
  */
@@ -6669,6 +6685,7 @@ irc_protocol_recv_command (struct t_irc_server *server,
         IRCB(privmsg, 1, 1, privmsg),    /* message received                */
         IRCB(quit, 1, 1, quit),          /* close all connections and quit  */
         IRCB(setname, 0, 1, setname),    /* set realname                    */
+        IRCB(tagmsg, 0, 1, tagmsg),      /* tag message                     */
         IRCB(topic, 0, 1, topic),        /* get/set channel topic           */
         IRCB(wallops, 1, 1, wallops),    /* wallops                         */
         IRCB(warn, 1, 0, warn),          /* warning received from server    */

tests/unit/plugins/irc/test-irc-protocol.cpp

@@ -1303,6 +1303,28 @@ TEST(IrcProtocolWithServer, setname_with_setname_cap)
     STRCMP_EQUAL("new realname2", ptr_nick->realname);
 }
 
+/*
+ * Tests functions:
+ *   irc_protocol_cb_tagmsg
+ */
+
+TEST(IrcProtocolWithServer, tagmsg)
+{
+    server_recv (":server 001 alice");
+
+    server_recv (":alice!user@host JOIN #test");
+    server_recv (":bob!user@host JOIN #test");
+
+    /* not enough arguments */
+    server_recv (":bob!user@host TAGMSG");
+
+    /* no tags */
+    server_recv (":bob!user@host TAGMSG #test");
+
+    /* with tags */
+    server_recv ("@tag1=123;tag2=456 :bob!user@host TAGMSG #test");
+}
+
 /*
  * Tests functions:
  *   irc_protocol_cb_topic