List Top N closed/merged pull requests for a GitHub repository, ordered by number of days open

list-prs-by-time-open.js

const RSVP = require('rsvp');
const moment = require('moment');
const GITHUB_API_TOKEN = process.env.GITHUB_API_TOKEN;
const GITHUB_USER = process.env.GITHUB_USER;
const GITHUB_REPO = process.env.GITHUB_REPO;
const TOP_N = 30;

fetchAllPRs();

function fetchAllPRs() {
  const GH = require('github');
  const gh = new GH({ version: '3.0.0', protocol: 'https' });
  gh.authenticate({ type: 'oauth', token: GITHUB_API_TOKEN });
  fetchPRsStartingAtPage(0, gh)
  .then(sortPRs)
  .then(function(prs) { return prs.slice(0, TOP_N); })
  .then(printPRs);
}

function fetchPRsStartingAtPage(page, gh) {
  console.log(`fetching page ${page} of PRs`);
  return new RSVP.Promise(function(resolve, reject) {
    const query = {
      user: GITHUB_USER,
      repo: GITHUB_REPO,
      state: 'closed',
      direction: 'desc',
      per_page: 100,
      page
    };

    gh.pullRequests.getAll(query, function(err, thisPage) {
      if (err || thisPage.length === 0) { return resolve([]); }

      fetchPRsStartingAtPage(page + 1, gh)
      .then(function(nextPage) {
        resolve(nextPage.concat(thisPage));
      });
    });
  });
}

function sortPRs(prs) {
  return prs.sort(function(a, b) {
    return daysOpen(b) - daysOpen(a);
  });
}

function printPRs(prs) {
  console.log(`Number  ${trimPad('Title', 50)}  Closed      Days Open  Merged?`);
  console.log(new Array(91).join('='));
  prs.forEach(function(pr) {
    const number = trimPad(pr.number, 6);
    const title = trimPad(pr.title, 50);
    const closed = formatDate(pr.merged_at || pr.closed_at);
    const days = trimPad(daysOpen(pr).toFixed(1), 9);
    const merged = pr.merged_at ? 'Y' : '';
    console.log(`${number}  ${title}  ${closed}  ${days}  ${merged}`);
  });
}

function trimPad(string, length) {
  string = '' + string;

  if (string.length < length) {
    return string + (new Array(length + 1  - string.length)).join(' ');
  }

  if (string.length === length) {
    return string;
  }

  return string.slice(0, length - 3) + '...';
}

function formatDate(date) {
  if (date == null) { return '    --    '; }
  return moment(date).format('YYYY-MM-DD');
}

function daysOpen(pr) {
  const closed = pr.merged_at || pr.closed_at;
  const opened = pr.created_at;
  if (closed == null || opened == null) return 0;
  return (moment(closed) - moment(opened)) / (1000 * 60 * 60 * 24);
}