Add a Lua file for things to be automatically loaded by the engine in all contexts

changelog

@@ -45,6 +45,8 @@ Version 1.13.7+dev:
      for example omitting the ".lua" file extension.
    * New wesnoth.create_weapon function to make a weapon that's not attached to a unit
      (which could be useful for animations)
+   * New wesnoth.show_message function shows a simple alert dialog, possibly with a choice
+   * New wesnoth.alert and wesnoth.confirm functions - simple shortcuts for the above.
  * Multiplayer:
    * Fixed statistics being lost when reloading an MP game.
  * Performance:

data/lua/core.lua

@@ -0,0 +1,17 @@
+-- Note: This file is loaded automatically by the engine.
+
+function wesnoth.alert(title, msg)
+	if not msg then
+		msg = title;
+		title = "";
+	end
+	wesnoth.show_message_box(title, msg, "ok", true)
+end
+
+function wesnoth.confirm(title, msg)
+	if not msg then
+		msg = title;
+		title = "";
+	end
+	return wesnoth.show_message_box(title, msg, "yes_no", true)
+end

data/lua/ilua.lua

@@ -5,6 +5,7 @@
 -- Steve Donovan, 2007
 -- Adapted by iceiceice for wesnoth, 2014
 -- Retrived from: http://lua-users.org/files/wiki_insecure/users/steved/ilua.lua
+-- Note: This file is loaded automatically by the engine.
 
 local pretty_print_limit = 20
 local max_depth = 7

data/lua/package.lua

@@ -1,3 +1,4 @@
+-- Note: This file is loaded automatically by the engine.
 
 local empty_pkg = {}
 

src/scripting/lua_kernel_base.cpp

@@ -473,6 +473,13 @@ lua_kernel_base::lua_kernel_base()
 		cmd_log_ << "Error: failed to load ilua.\n";
 	}
 	lua_settop(L, 0);
+
+	cmd_log_ << "Loading core...\n";
+	lua_pushstring(L, "lua/core.lua");
+	if(intf_require(L) != 1) {
+		cmd_log_ << "Error: Failed to load core.\n";
+	}
+	lua_settop(L, 0);
 }
 
 lua_kernel_base::~lua_kernel_base()