Bubberstation/tools/test_merge_bot/comment.js

const FIND_EXISTING_ENTRIES = /### (.+)\n((?:- .+\n)*)/g;
const ENTRY_PATTERN =
  /- \[(?<round_id>[0-9]+) @ (?<datetime>.+?)\]\((?<url>.+)\)/;

export const createComment = (servers, existingComment) => {
  if (existingComment) {
    for (const [, serverName, entries] of existingComment.matchAll(
      FIND_EXISTING_ENTRIES,
    )) {
      let server = servers[serverName];
      if (!server) {
        server = [];
        servers[serverName] = server;
      }

      for (const line of entries.split('\n')) {
        const match = line.match(ENTRY_PATTERN);
        if (!match) {
          continue;
        }

        const { round_id: roundIdString, datetime, url } = match.groups;
        const round_id = parseInt(roundIdString, 10);

        if (server.find((round) => round.round_id === round_id)) {
          continue;
        }

        server.push({
          round_id,
          datetime,
          url,
        });
      }
    }
  }

  const roundIds = Object.values(servers)
    .flat()
    .map(({ round_id }) => round_id)
    .sort()
    .join(', ');

  const newHeader = `<!-- test_merge_bot: ${roundIds} -->`;

  if (existingComment?.startsWith(newHeader)) {
    return null;
  }

  let totalRounds = 0;
  let listOfRounds = '';

  for (const [server, rounds] of Object.entries(servers).sort(
    ([a], [b]) => b - a,
  )) {
    totalRounds += rounds.length;

    listOfRounds += `${'\n'}### ${server}`;

    for (const { datetime, round_id, url } of rounds.sort(
      (a, b) => b.round_id - a.round_id,
    )) {
      listOfRounds += `${'\n'}- [${round_id} @ ${datetime}](${url})`;
    }

    listOfRounds += '\n';
  }

  return (
    newHeader +
    `\nThis pull request was test merged in ${totalRounds} round(s).` +
    '\n' +
    '<details><summary>Round list</summary>\n\n' +
    listOfRounds +
    '\n</details>\n'
  );
};