Allow interrupting structure construction, closes #71

source/match/hud/unit-menus/GenericMenu.gd

@@ -1,8 +1,13 @@
 extends GridContainer
 
+const Structure = preload("res://source/match/units/Structure.gd")
+
 var units = []
 
 
 func _on_cancel_action_button_pressed():
+	if len(units) == 1 and units[0] is Structure and units[0].is_under_construction():
+		units[0].cancel_construction()
+		return
 	for unit in units:
 		unit.action = null

source/match/units/Structure.gd

@@ -35,13 +35,14 @@ func construct(progress):
 	if expected_hp_after_progressing > expected_hp_before_progressing:
 		hp += 1
 	if _construction_progress >= 1.0:
-		finnish_construction()
+		_finish_construction()
 
 
-func finnish_construction():
-	_change_geometry_material(null)
-	if is_inside_tree():
-		constructed.emit()
+func cancel_construction():
+	var scene_path = get_script().resource_path.replace(".gd", ".tscn")
+	var construction_cost = Constants.Match.Units.CONSTRUCTION_COSTS[scene_path]
+	player.add_resources(construction_cost)
+	queue_free()
 
 
 func is_constructed():
@@ -52,6 +53,12 @@ func is_under_construction():
 	return not is_constructed()
 
 
+func _finish_construction():
+	_change_geometry_material(null)
+	if is_inside_tree():
+		constructed.emit()
+
+
 func _change_geometry_material(material):
 	for child in find_child("Geometry").find_children("*"):
 		if "material_override" in child: