add sprite anim tool

tools/SpriteAnimTool.gd

@@ -0,0 +1,102 @@
+@tool
+class_name SpriteAnimTool
+extends AnimationPlayer
+
+@export var run: bool : set = execute
+
+func update():
+	pass
+
+func execute(x):
+	print("execute")
+	if not Engine.is_editor_hint():
+		print("SpriteAnimTool can only be run in the editor")
+		return
+	update()
+
+func add_animation(builder: Builder) -> void:
+	var name = builder.name
+	var start_frame = builder.start_frame
+	var end_frame = builder.end_frame
+	var duration = builder.duration
+	var loop = builder.loop
+	var discrete = builder.discrete
+
+	var node = builder.node
+	var property = "frame"
+
+	var lib = get_animation_library("")
+	if lib == null:
+		lib = AnimationLibrary.new()
+		add_animation_library("", lib)
+
+	var anim = Animation.new()
+	if lib.has_animation(name):
+		anim = lib.get_animation(name)
+	else:
+		lib.add_animation(name, anim)
+
+	anim.loop_mode = loop
+	anim.length = duration
+
+	var sprite_path = String(owner.get_path_to(get_node(node))) + ":" + property
+	var existing_track = anim.find_track(sprite_path, Animation.TYPE_VALUE)
+	if existing_track != -1:
+		anim.remove_track(existing_track)
+
+	var track = anim.add_track(Animation.TYPE_VALUE)
+	anim.track_set_path(track, sprite_path)
+	if discrete:
+		anim.value_track_set_update_mode(track, Animation.UPDATE_DISCRETE)
+
+	var total_frames = (end_frame - start_frame) + 1
+
+	var frames = builder.frames
+	if frames.size() > 0:
+		total_frames = frames.size()
+
+	var frame_duration = duration / total_frames
+	for i in range(0, total_frames):
+		var frame = start_frame + i if frames.size() == 0 else frames[i]
+		var key = anim.track_insert_key(track, frame_duration * i, i)
+		anim.track_set_key_value(track, key, frame)
+
+
+class Builder:
+	var node = ""
+	var name = ""
+	var start_frame = 0
+	var end_frame = 0
+	var frames = []
+
+	var duration = 1.0
+	var loop = true
+	var discrete = true
+
+	func _init(node):
+		self.node = node
+
+	func setName(n: String):
+		self.name = n
+		return self
+
+	func setRange(start: int, end: int):
+		self.start_frame = start
+		self.end_frame = end
+		return self
+
+	func setDuration(d: float):
+		self.duration = d
+		return self
+
+	func setLoop(l: bool):
+		self.loop = l
+		return self
+
+	func setDiscrete(d: bool):
+		self.discrete = d
+		return self
+
+	func setFrames(f: Array):
+		self.frames = f
+		return self