Add support for numerics associated with cs_set_misc entries.

This is mainly to allow the URL entry to use RPL_CHANNELURL.

data/chanserv.example.conf

@@ -1256,7 +1256,7 @@ command { service = "ChanServ"; name = "SET NOEXPIRE"; command = "chanserv/saset
  * A field named misc_description may be given for use with help output.
  */
 module { name = "cs_set_misc" }
-command { service = "ChanServ"; name = "SET URL"; command = "chanserv/set/misc"; misc_description = _("Associate a URL with the channel"); }
+command { service = "ChanServ"; name = "SET URL"; command = "chanserv/set/misc"; misc_description = _("Associate a URL with the channel"); misc_numeric = 328; }
 command { service = "ChanServ"; name = "SET EMAIL"; command = "chanserv/set/misc"; misc_description = _("Associate an email address with the channel"); }
 
 /*

docs/Changes

@@ -2,6 +2,7 @@ Anope Version 2.1.11-git
 ------------------------
 Added support for database migrations to the mysql module.
 Added support for renicking users to their UID when enforcing nickname protection.
+Added support for sending channel URLs to joining users.
 Allowed selecting languages using a shorter version of their name.
 Changed various messages to use human-readable durations instead of seconds.
 Improved the creation of expiry and duration messages.

modules/chanserv/cs_set_misc.cpp

@@ -15,6 +15,7 @@
 static Module *me;
 
 static Anope::map<Anope::string> descriptions;
+static Anope::map<uint16_t> numerics;
 
 struct CSMiscData;
 static Anope::map<ExtensibleItem<CSMiscData> *> items;
@@ -189,6 +190,7 @@ public:
 	void OnReload(Configuration::Conf *conf) override
 	{
 		descriptions.clear();
+		numerics.clear();
 
 		for (int i = 0; i < conf->CountBlock("command"); ++i)
 		{
@@ -204,9 +206,31 @@ public:
 				continue;
 
 			descriptions[cname] = desc;
+
+			auto numeric = block->Get<unsigned>("misc_numeric");
+			if (numeric >= 1 && numeric <= 999)
+				numerics["cs_set_misc:" + GetAttribute(cname)] = numeric;
 		}
 	}
 
+	void OnJoinChannel(User *user, Channel *c) override
+	{
+		if (!c->ci || !user->server->IsSynced() || numerics.empty())
+			return;
+
+		for (const auto &[name, ext] : items)
+		{
+			auto *data = ext->Get(c->ci);
+			if (!data)
+				continue;
+
+			auto numeric = numerics.find(name);
+			if (numeric != numerics.end())
+				IRCD->SendNumeric(numeric->second, user->GetUID(), c->ci->name, data->data);
+		}
+	}
+
+
 	void OnChanInfo(CommandSource &source, ChannelInfo *ci, InfoFormatter &info, bool) override
 	{
 		for (const auto &[_, e] : items)