undo/redo place 4 town entrances

src/scenedit/scen.actions.cpp

@@ -719,6 +719,8 @@ void commit_stroke() {
 	}
 }
 
+const std::vector<std::string> entrance_names = {"North", "East", "South", "West"};
+
 static bool handle_terrain_action(location the_point, bool ctrl_hit) {
 	cArea* cur_area = get_current_area();
 	std::shared_ptr<cAction> undo_action = nullptr;
@@ -972,6 +974,10 @@ static bool handle_terrain_action(location the_point, bool ctrl_hit) {
 				
 			case MODE_PLACE_NORTH_ENTRANCE: case MODE_PLACE_EAST_ENTRANCE:
 			case MODE_PLACE_SOUTH_ENTRANCE: case MODE_PLACE_WEST_ENTRANCE:
+				undo_list.add(action_ptr(new aPlaceTownEntrance(
+					std::string {"Place "} + entrance_names[overall_mode - 10] + " Entrance",
+					overall_mode - 10, town->start_locs[overall_mode - 10], spot_hit)));
+				update_edit_menu();
 				town->start_locs[overall_mode - 10].x = spot_hit.x;
 				town->start_locs[overall_mode - 10].y = spot_hit.y;
 				overall_mode = MODE_DRAWING;

src/scenedit/scen.undo.cpp

@@ -598,4 +598,16 @@ bool aImportOutdoors::redo_me() {
 	set_current_out(which);
 	start_out_edit();
 	return true;
+}
+
+bool aPlaceTownEntrance::undo_me() {
+	town->start_locs[which_entrance].x = old_loc.x;
+	town->start_locs[which_entrance].y = old_loc.y;
+	return true;
+}
+
+bool aPlaceTownEntrance::redo_me() {
+	town->start_locs[which_entrance].x = new_loc.x;
+	town->start_locs[which_entrance].y = new_loc.y;
+	return true;
 }

src/scenedit/scen.undo.hpp

@@ -382,4 +382,16 @@ public:
 	~aImportOutdoors();
 };
 
+/// Action which places one of the four entrance locations inside a town
+class aPlaceTownEntrance : public cTerrainAction {
+	int which_entrance;
+	location old_loc;
+	location new_loc;
+	bool undo_me() override;
+	bool redo_me() override;
+public:
+	aPlaceTownEntrance(std::string name, int which, location old_loc, location new_loc) :
+		cTerrainAction(name, new_loc), which_entrance(which), old_loc(old_loc), new_loc(new_loc) {}
+};
+
 #endif