# @flag hidden
def youtube_playlist_parser(~pwd="", url) =
  ignore(pwd)
  binary = null.get(settings.protocol.youtube_dl.path())

  def parse_line(line) =
    let json.parse (parsed : {url: string}?) = line
    parsed = parsed ?? {url="foo"}
    url = parsed.url
    ([], "youtube-dl:#{url}")
  end

  if
    r/^youtube-pl/.test(url)
  then
    uri = list.nth(default="", r/:/.split(url), 1)
    list.map(
      parse_line,
      process.read.lines(
        "#{binary} -j --flat-playlist #{uri}"
      )
    )
  else
    []
  end
end

playlist.parse.register(
  format="youtube-dl", strict=true, youtube_playlist_parser
)