modules/console: Add manual room join w/ injection placement event_id.

modules/console.cc

@@ -1645,6 +1645,67 @@ console_cmd__room__redact(opt &out, const string_view &line)
 	return true;
 }
 
+bool
+console_cmd__room__join(opt &out, const string_view &line)
+{
+	const string_view room_id_or_alias
+	{
+		token(line, ' ', 0)
+	};
+
+	const m::user::id &user_id
+	{
+		token(line, ' ', 1)
+	};
+
+	const string_view &event_id
+	{
+		token(line, ' ', 2, {})
+	};
+
+	switch(m::sigil(room_id_or_alias))
+	{
+		case m::id::ROOM:
+		{
+			const m::room room
+			{
+				room_id_or_alias, event_id
+			};
+
+			const auto join_event
+			{
+				m::join(room, user_id)
+			};
+
+			out << join_event << std::endl;
+			return true;
+		}
+
+		case m::id::ROOM_ALIAS:
+		{
+			const m::room::alias alias
+			{
+				room_id_or_alias
+			};
+
+			const auto join_event
+			{
+				m::join(alias, user_id)
+			};
+
+			out << join_event << std::endl;
+			return true;
+		}
+
+		default: throw error
+		{
+			"Don't know how to join '%s'", room_id_or_alias
+		};
+	}
+
+	return true;
+}
+
 bool
 console_cmd__room__id(opt &out, const string_view &id)
 {