LUA-Api: add alignment parameter for text in window header

Possible modes are :
	* "DEFAULT" (left)
	* "CENTER"
	* "RIGHT"

TODO: doc

src/gui/lua/lua_api_version.h

@@ -4,4 +4,4 @@
  * to luainstance.h changes
  */
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 70
+#define LUA_API_VERSION_MINOR 71

src/gui/lua/lua_cc_window.cpp

@@ -220,7 +220,10 @@ int CLuaInstCCWindow::CCWindowSetCaption(lua_State *L)
 	std::string name = "";
 	tableLookup(L, "name", name) || tableLookup(L, "title", name) || tableLookup(L, "caption", name);
 
-	D->w->setWindowCaption(name);
+	lua_Integer alignment = (lua_Integer)CTextBox::NO_AUTO_LINEBREAK;
+	tableLookup(L, "alignment", alignment);
+
+	D->w->setWindowCaption(name, alignment | (lua_Integer)CTextBox::NO_AUTO_LINEBREAK);
 	return 0;
 }
 

src/gui/lua/luainstance.cpp

@@ -383,6 +383,18 @@ static void set_lua_variables(lua_State *L)
 		{ NULL, 0 }
 	};
 
+	/*
+	 * possible text allignment modes usable for window header caption
+	 * API: >= v1.71
+	*/
+	table_key text_alignment[] =
+	{
+		{ "DEFAULT",		(lua_Integer)CTextBox::NO_AUTO_LINEBREAK},
+		{ "CENTER",		(lua_Integer)CTextBox::CENTER},
+		{ "RIGHT",		(lua_Integer)CTextBox::RIGHT},
+		{ NULL, 0 }
+	};
+
 	/* list of environment variable arrays to be exported */
 	lua_envexport e[] =
 	{
@@ -399,6 +411,7 @@ static void set_lua_variables(lua_State *L)
 		{ "CURL",        	curl_status },
 		{ "NMODE",       	neutrino_mode },
 		{ "POSTMSG",     	post_msg },
+		{ "TEXT_ALIGNMENT",	text_alignment },
 		{ NULL, NULL }
 	};