From a2d5995cf5b2d9f24ce6f2869a96ba3f75bb41d5 Mon Sep 17 00:00:00 2001
From: Přemysl Eric Janouch <p@janouch.name>
Date: Wed, 7 Sep 2022 19:04:23 +0200
Subject: xC: don't autoactivate buffers on forced JOINs

---
 NEWS |  2 ++
 xC.c | 49 ++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/NEWS b/NEWS
index 5b187c9..59fb4f8 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,8 @@ Unreleased
 
  * xC: improved pager integration capabilities
 
+ * xC: unsolicited JOINs will no longer automatically activate the buffer
+
  * xC: normalized editline's history behaviour, making it a viable frontend
 
  * xC: various bugfixes
diff --git a/xC.c b/xC.c
index dcecabb..b7aa712 100644
--- a/xC.c
+++ b/xC.c
@@ -1801,6 +1801,8 @@ struct server
 	char *irc_user_host;                ///< Our current user@host
 	bool autoaway_active;               ///< Autoaway is currently active
 
+	struct strv outstanding_joins;      ///< JOINs we expect a response to
+
 	struct strv cap_ls_buf;             ///< Buffer for IRCv3.2 CAP LS
 	bool cap_echo_message;              ///< Whether the server echoes messages
 	bool cap_away_notify;               ///< Whether we get AWAY notifications
@@ -1934,6 +1936,7 @@ server_new (struct poller *poller)
 
 	self->irc_user_mode = str_make ();
 
+	self->outstanding_joins = strv_make ();
 	self->cap_ls_buf = strv_make ();
 	server_init_specifics (self);
 	return self;
@@ -1981,6 +1984,7 @@ server_destroy (struct server *self)
 	str_free (&self->irc_user_mode);
 	free (self->irc_user_host);
 
+	strv_free (&self->outstanding_joins);
 	strv_free (&self->cap_ls_buf);
 	server_free_specifics (self);
 	free (self);
@@ -5670,6 +5674,7 @@ irc_destroy_state (struct server *s)
 	str_reset (&s->irc_user_mode);
 	cstr_set (&s->irc_user_host, NULL);
 
+	strv_reset (&s->outstanding_joins);
 	strv_reset (&s->cap_ls_buf);
 	s->cap_away_notify = false;
 	s->cap_echo_message = false;
@@ -7103,6 +7108,16 @@ irc_handle_sent_cap (struct server *s, const struct irc_message *msg)
 			"#s: #S", "Capabilities requested", args);
 }
 
+static void
+irc_handle_sent_join (struct server *s, const struct irc_message *msg)
+{
+	if (msg->params.len < 1)
+		return;
+
+	if (strcmp (msg->params.vector[0], "0"))
+		cstr_split (msg->params.vector[0], ",", true, &s->outstanding_joins);
+}
+
 static void
 irc_handle_sent_notice_text (struct server *s,
 	const struct irc_message *msg, struct str *text)
@@ -7186,6 +7201,7 @@ g_irc_sent_handlers[] =
 {
 	// This list needs to stay sorted
 	{ "CAP",     irc_handle_sent_cap     },
+	{ "JOIN",    irc_handle_sent_join    },
 	{ "NOTICE",  irc_handle_sent_notice  },
 	{ "PRIVMSG", irc_handle_sent_privmsg },
 };
@@ -7435,12 +7451,27 @@ irc_handle_invite (struct server *s, const struct irc_message *msg)
 			"#n has invited #n to #S", msg->prefix, target, channel_name);
 }
 
+static bool
+irc_satisfy_join (struct server *s, const char *target)
+{
+	// This queue could use some garbage collection,
+	// but it's unlikely to pose problems.
+	for (size_t i = 0; i < s->outstanding_joins.len; i++)
+		if (!irc_server_strcmp (s, target, s->outstanding_joins.vector[i]))
+		{
+			strv_remove (&s->outstanding_joins, i);
+			return true;
+		}
+	return false;
+}
+
 static void
 irc_handle_join (struct server *s, const struct irc_message *msg)
 {
 	if (!msg->prefix || msg->params.len < 1)
 		return;
 
+	// TODO: RFC 2812 doesn't guarantee that the argument isn't a target list.
 	const char *channel_name = msg->params.vector[0];
 	if (!irc_is_channel (s, channel_name))
 		return;
@@ -7466,7 +7497,7 @@ irc_handle_join (struct server *s, const struct irc_message *msg)
 		buffer_add (s->ctx, buffer);
 
 		char *input = CALL_ (s->ctx->input, get_line, NULL);
-		if (!*input)
+		if (irc_satisfy_join (s, channel_name) && !*input)
 			buffer_activate (s->ctx, buffer);
 		else
 			buffer->highlighted = true;
@@ -8841,12 +8872,16 @@ irc_process_numeric (struct server *s,
 		// TODO: whitelist/blacklist a lot more replies in here.
 		// TODO: we should either strip the first parameter from the resulting
 		//   buffer line, or at least put it in brackets
-		if (msg->params.len > 1)
-		{
-			struct buffer *x;
-			if ((x = str_map_find (&s->irc_buffer_map, msg->params.vector[1])))
-				buffer = x;
-		}
+		if (msg->params.len < 2)
+			break;
+
+		struct buffer *x;
+		if ((x = str_map_find (&s->irc_buffer_map, msg->params.vector[1])))
+			buffer = x;
+
+		// A JOIN request should be split at commas,
+		// then for each element produce either a JOIN response, or a numeric.
+		(void) irc_satisfy_join (s, msg->params.vector[1]);
 	}
 
 	if (buffer)
-- 
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