import bpy
import os


icons_collection = None
icons_directory = os.path.dirname(__file__)


def get_icon_id(identifier):
    return get_icon(identifier).icon_id


def get_icon(identifier):
    if identifier in icons_collection:
        return icons_collection[identifier]
    return icons_collection.load(identifier, os.path.join(icons_directory, identifier + ".png"), "IMAGE")