support lua require()

Util/Lua.h

@@ -0,0 +1,44 @@
+/*
+    open source routing machine
+    Copyright (C) Dennis Luxen, others 2010
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU AFFERO General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+or see http://www.gnu.org/licenses/agpl.txt.
+ */
+
+#ifndef LUA_UTIL_
+#define LUA_UTIL_
+
+#include <string>
+#include <boost/filesystem/convenience.hpp>
+
+bool lua_function_exists(lua_State* lua_state, const char* name)
+{
+    using namespace luabind;
+    object g = globals(lua_state);
+    object func = g[name];
+    return func && type(func) == LUA_TFUNCTION;
+}
+
+void luaAddScriptFolderToLoadPath(lua_State* myLuaState, const char* fileName) {
+    //add the folder contain the script to the lua load path, so script can easily require() other lua scripts inside that folder
+    //see http://lua-users.org/wiki/PackagePath for details on the package.path syntax
+    const boost::filesystem::path profilePath( fileName );
+    const std::string folder = profilePath.parent_path().c_str();
+    const std::string luaCode = "package.path = \"" + folder + "/?.lua;\" .. package.path";
+    luaL_dostring(myLuaState,luaCode.c_str());
+}
+
+#endif /* LUA_UTIL_ */