Add on_board and on_border map methods

src/scripting/game_lua_kernel.cpp

@@ -4136,6 +4136,8 @@ game_lua_kernel::game_lua_kernel(game_state & gs, play_controller & pc, reports
 	static luaL_Reg const map_callbacks[] {
 		// Map methods
 		{"terrain_mask", &intf_terrain_mask},
+		{"on_board", &intf_on_board},
+		{"on_border", &intf_on_border},
 		// Shroud operations
 		{"place_shroud", &dispatch2<&game_lua_kernel::intf_shroud_op, true>},
 		{"remove_shroud", &dispatch2<&game_lua_kernel::intf_shroud_op, false>},

src/scripting/lua_terrainmap.cpp

@@ -345,6 +345,25 @@ static int impl_terrainmap_set(lua_State *L)
 	return luaL_argerror(L, 2, err_msg.c_str());
 }
 
+static int intf_on_board(lua_State* L)
+{
+	gamemap_base& tm = luaW_checkterrainmap(L, 1);
+	map_location loc = luaW_checklocation(L, 2);
+	bool with_border = luaL_opt(L, luaW_toboolean, 3, false);
+
+	lua_pushboolean(L, with_border ? tm.on_board_with_border(loc) : tm.on_board(loc));
+	return 1;
+}
+
+static int intf_on_border(lua_State* L)
+{
+	gamemap_base& tm = luaW_checkterrainmap(L, 1);
+	map_location loc = luaW_checklocation(L, 2);
+
+	lua_pushboolean(L, tm.on_board_with_border(loc) && !tm.on_board(loc));
+	return 1;
+}
+
 static std::vector<gamemap::overlay_rule> read_rules_vector(lua_State *L, int index)
 {
 	std::vector<gamemap::overlay_rule> rules;

src/scripting/lua_terrainmap.hpp

@@ -58,6 +58,8 @@ int intf_terrainmap_create(lua_State *L);
 int intf_terrainmap_get(lua_State *L);
 
 int intf_replace_if_failed(lua_State* L);
+int intf_on_board(lua_State* L);
+int intf_on_border(lua_State* L);
 
 namespace lua_terrainmap {
 	std::string register_metatables(lua_State *L);