Godot BitmapFont cutter

tool
extends Label   # on preview label

export var texture:Texture  # contains
export var font:BitmapFont  # saves into it if not new
export var glyphSize: = Vector2(16,16)
export var symbolsInTexture: = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890?!;:- '

export (bool) var cut:bool = false setget set_cut
func set_cut(value:bool)->void:
    if !value:
        return

    update()

func update()->void:
    font.clear()
    var size:Vector2 = texture.get_size()
    font.add_texture(texture)
    font.height = glyphSize.y
    var width:int = size.x / glyphSize.x
    var x = 0
    var y = 0
    var rect = Rect2(Vector2(0.0,0.0), glyphSize)
    for i in symbol_string.length():
        var c = symbol_string[i]
        x = i % width
        y = i / width
        rect.position = glyphSize * Vector2(x,y)
        print(c.to_utf8()[0])
        font.add_char(c.to_utf8()[0], 0, rect)

    font.update_changes()