ircd:Ⓜ️ Add viewing(user) for currently viewing room w/ console cmd.

include/ircd/m/user/user.h

@@ -21,6 +21,8 @@ namespace ircd::m
 	bool active(const user &);
 	bool is_oper(const user &);
 
+	id::room::buf viewing(const user &, size_t i = 0);
+
 	user create(const id::user &, const json::members &args = {});
 }
 

matrix/user.cc

@@ -14,6 +14,29 @@ namespace ircd::m
 	static room create_user_room(const user::id &, const room::id &, const json::members &contents);
 }
 
+ircd::m::room::id::buf
+ircd::m::viewing(const user &user,
+                 size_t i)
+{
+	const m::breadcrumbs breadcrumbs
+	{
+		user
+	};
+
+	room::id::buf ret;
+	breadcrumbs.for_each([&ret, &i]
+	(const auto &room_id)
+	{
+		if(i-- > 0)
+			return true;
+
+		ret = room_id;
+		return false;
+	});
+
+	return ret;
+}
+
 bool
 ircd::m::is_oper(const user &user)
 {

modules/console.cc

@@ -13535,6 +13535,38 @@ console_cmd__user__breadcrumbs(opt &out, const string_view &line)
 	return true;
 }
 
+bool
+console_cmd__user__viewing(opt &out, const string_view &line)
+{
+	const params param{line, " ",
+	{
+		"user_id", "idx"
+	}};
+
+	const m::user::id user_id
+	{
+		param.at("user_id")
+	};
+
+	const size_t idx
+	{
+		param.at("idx", 0UL)
+	};
+
+	const m::user user
+	{
+		user_id
+	};
+
+	const auto room_id
+	{
+		m::viewing(user, idx)
+	};
+
+	out << room_id << std::endl;
+	return true;
+}
+
 bool
 console_cmd__user__pushrules(opt &out, const string_view &line)
 {