module.exports = grammar({
  name: "yts",

  rules: {
    source_file: ($) => repeat(choice($.line, $.comment)),
    line: ($) =>
      seq($.command, repeat($.flag), $.id, $.title, $.date, $.author, $.duration, $.url, "\n"),

    command: ($) => choice("pick", "p", "watch", "w", "drop", "d", "url", "u"),
    flag: ($) =>
      choice(
              /-\w [^\s]+/,
              /-\w '[^']*'/,
              /-\w "[^"]*"/,
              /-\w=[^\s]+/,
              /-\w='[^']*'/,
              /-\w="[^"]*"/,

              /--\w+ [^\s]+/,
              /--\w+ '[^']*'/,
              /--\w+ "[^"]*"/,
              /--\w+=[^\s]+/,
              /--\w+='[^']*'/,
              /--\w+="[^"]*"/,
              ),
    id: ($) => /[a-z0-9]+/,
    title: ($) => seq($._q, /[^"]+/, $._q),
    date: ($) => seq($._q, /\d{4}-\d{2}-\d{2}/, $._q),
    author: ($) => seq($._q, /[^"]+/, $._q),
    duration: ($) =>
      seq(
        $._q,
        seq(choice("[No Duration]", /\d+m \d+s/, /\d+h \d+m/)),
        $._q,
      ),
    url: ($) => seq($._q, /[^"]+/, $._q),
    comment: ($) => /#.*/,
    _q: ($) => $.quote,
    quote: ($) => /"/,
  },
  extras: ($) => [/\s/],
});