Make ESCLocation is_start_location work (#421)

Introducing BYPASS_LAST_ROOM global to allow changing scene without considering the previous room
Fixes godot-escoria/escoria-issues#40

addons/escoria-core/game/core-scripts/esc/commands/change_scene.gd

@@ -53,7 +53,8 @@ func run(command_params: Array) -> int:
 		command_params[2]
 	])
 	
-	if escoria.main.current_scene:
+	if escoria.main.current_scene \
+		and not escoria.globals_manager.get_global("BYPASS_LAST_SCENE"):
 		escoria.globals_manager.set_global(
 			"ESC_LAST_SCENE", 
 			escoria.main.current_scene.global_id, 
@@ -112,5 +113,13 @@ func run(command_params: Array) -> int:
 			]
 		)
 		return ESCExecution.RC_ERROR
+	
+	# If the ESC_LAST_SCENE global was bypassed, reset bypass variable to false
+	if escoria.globals_manager.get_global("BYPASS_LAST_SCENE"):
+		escoria.globals_manager.set_global(
+			"BYPASS_LAST_SCENE", 
+			false, 
+			true
+		)
 
 	return ESCExecution.RC_OK

addons/escoria-core/game/core-scripts/esc/esc_globals_manager.gd

@@ -11,7 +11,8 @@ signal global_changed(global, old_value, new_value)
 
 # A list of reserved globals which can not be overridden
 const RESERVED_GLOBALS = [
-	"ESC_LAST_SCENE"
+	"ESC_LAST_SCENE",
+	"BYPASS_LAST_SCENE"
 ]
 
 
@@ -22,6 +23,7 @@ export(Dictionary) var _globals = {}
 
 func _init():
 	set_global("ESC_LAST_SCENE", "", true)
+	set_global("BYPASS_LAST_SCENE", false, true)
 
 
 # Check if a global was registered

addons/escoria-core/game/core-scripts/esc/esc_object_manager.gd

@@ -83,8 +83,9 @@ func get_object(global_id: String) -> ESCObject:
 		return objects[global_id]
 	else:
 		escoria.logger.report_warnings(
-			"Invalid object retrieved",
+			"esc_object_manager.gd:get_object()",
 			[
+				"Invalid object retrieved",
 				"Object with global id %s not found" % global_id
 			]
 		)
@@ -119,3 +120,17 @@ func save_game(p_savegame: ESCSaveGame) -> void:
 			continue
 		p_savegame.objects[obj_global_id] = \
 			objects[obj_global_id].get_save_data()
+
+
+func get_start_location() -> ESCLocation:
+	for object in objects.values():
+		if object.node is ESCLocation and object.node.is_start_location:
+			return object
+	escoria.logger.report_warnings(
+			"esc_object_manager.gd:get_start_location()",
+			[
+				"Room has no ESCLocation node with 'is_start_location' enabled.",
+				"Player will be set at position (0,0) by default."
+			]
+		)
+	return null

addons/escoria-core/game/core-scripts/esc_room.gd

@@ -98,6 +98,13 @@ func _ready():
 		if rc[0] != ESCExecution.RC_OK:
 			return rc[0]
 		
+		if (escoria.globals_manager.get_global("ESC_LAST_SCENE") == null \
+			or escoria.globals_manager.get_global("ESC_LAST_SCENE").empty()) \
+			and player != null \
+			and escoria.object_manager.get_start_location() != null:
+			player.teleport(escoria.object_manager.get_start_location().node)
+			
+		
 		escoria.main.scene_transition.transition()
 		yield(escoria.main.scene_transition, "transition_done")
 	

addons/escoria-core/ui_library/tools/room_select/room_select.gd

@@ -48,12 +48,14 @@ func _ready():
 
 # Switch to the selected room
 func _on_button_pressed():
+	escoria.globals_manager.set_global("BYPASS_LAST_SCENE", true, true)
 	var script = escoria.esc_compiler.compile([
 		":debug",
 		"change_scene %s" % _options_paths[_selected_id]
 	])
 	escoria.event_manager.interrupt_running_event()
 	escoria.event_manager.queue_event(script.events['debug'])
+	
 
 
 # A room was selected, store the selection