modules: Start an m_user module; add preliminary message highlight test.

modules/Makefile.am

@@ -85,6 +85,7 @@ s_module_LTLIBRARIES = \
 m_moduledir = @moduledir@
 
 m_noop_la_SOURCES = m_noop.cc
+m_user_la_SOURCES = m_user.cc
 m_event_la_SOURCES = m_event.cc
 m_typing_la_SOURCES = m_typing.cc
 m_receipt_la_SOURCES = m_receipt.cc
@@ -99,6 +100,7 @@ m_room_aliases_la_SOURCES = m_room_aliases.cc
 
 m_module_LTLIBRARIES = \
 	m_noop.la \
+	m_user.la \
 	m_event.la \
 	m_typing.la \
 	m_receipt.la \

modules/m_user.cc

@@ -0,0 +1,38 @@
+// Matrix Construct
+//
+// Copyright (C) Matrix Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+using namespace ircd::m;
+using namespace ircd;
+
+mapi::header
+IRCD_MODULE
+{
+	"Matrix user library; modular components."
+};
+
+extern "C" bool
+highlighted_event(const event &event,
+                  const user &user)
+{
+	if(json::get<"type"_>(event) != "m.room.message")
+		return false;
+
+	const json::object &content
+	{
+		json::get<"content"_>(event)
+	};
+
+	const string_view &body
+	{
+		content.get("body")
+	};
+
+	return has(body, user.user_id);
+}