From 32d5702869fbe90a890890171d67853735a83cff Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Tue, 5 Jan 2016 18:44:17 -0600
Subject: [PATCH] extensions: add the ability to hide uncommon channels in
 WHOIS, like in ircd-seven (closes #6)

---
 extensions/Makefile.in              |  1 +
 extensions/hide_uncommon_channels.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 extensions/hide_uncommon_channels.c

diff --git a/extensions/Makefile.in b/extensions/Makefile.in
index defab61e9..83927d1aa 100644
--- a/extensions/Makefile.in
+++ b/extensions/Makefile.in
@@ -79,6 +79,7 @@ SRCS =                          \
   m_webirc.c			\
   m_remove.c			\
   m_roleplay.c			\
+  hide_uncommon_channels.c	\
   no_kill_services.c		\
   no_locops.c			\
   no_oper_invis.c		\
diff --git a/extensions/hide_uncommon_channels.c b/extensions/hide_uncommon_channels.c
new file mode 100644
index 000000000..3ba6b3eea
--- /dev/null
+++ b/extensions/hide_uncommon_channels.c
@@ -0,0 +1,28 @@
+/*
+ * Override WHOIS logic to hide channel memberships that are not common.
+ *   -- kaniini
+ */
+
+#include "stdinc.h"
+#include "modules.h"
+#include "client.h"
+#include "hook.h"
+#include "ircd.h"
+#include "send.h"
+#include "s_conf.h"
+#include "s_newconf.h"
+
+static void h_huc_doing_whois_channel_visibility(hook_data_client *);
+
+mapi_hfn_list_av1 huc_hfnlist[] = {
+	{ "doing_whois_channel_visibility", (hookfn) h_huc_doing_whois_channel_visibility },
+	{ NULL, NULL }
+};
+
+DECLARE_MODULE_AV1(hide_uncommon_channels, NULL, NULL, NULL, NULL, huc_hfnlist, "");
+
+static void
+h_huc_doing_whois_channel_visibility(hook_data_client *hdata)
+{
+	hdata->approved = ((PubChannel(hdata->chptr) && !IsInvisible(hdata->target)) || IsMember((hdata->client), (hdata->chptr)));
+}