Add very basic Flask implementation

import json

import logging

from karaokatalog.get_parser import get_parser

from karaokatalog.Library import Library

from karaokatalog.ui.serve.get_flask_app import get_flask_app

logging.basicConfig(

    format="%(asctime)s [%(levelname)s] %(message)s", level=logging.INFO

)

if __name__ == "__main__":

    args = get_parser(

        "ui.serve", "Serve a web UI to browse the Karaokatalog"

    ).parse_args()

    songs_json_path = args.library_path / "songs.json"

    if songs_json_path.exists():

        logging.info(f"Loading {songs_json_path}")

        with songs_json_path.open("r", encoding="utf-8") as f:

            songs = json.load(f)

    else:

        logging.info("Loading library")

        library = Library.from_dir(args.library_path)

        logging.info("Library loaded")

        songs = [song.as_dict() for song in library.songs]

    logging.info("Starting UI")

    app = get_flask_app(songs)

    app.run(port=5657)

from collections.abc import Sequence

from flask import Flask

def get_flask_app(songs: Sequence[dict[str, str]]) -> Flask:

    app = Flask("karaokatalog.ui", static_url_path="/")

    # This is only to make the type checker happy.

    songs_list = list(songs)

    @app.get("/api/songs")

    def get_songs() -> list[dict[str, str]]:

        return songs_list

    return app