gistfile1.js

var fs = require('fs')
  , path = require('path')
  , request = require('request')
  , cheerio = require('cheerio');

//
// Create target directory
//
if (!fs.existsSync(__dirname + '/target')) fs.mkdirSync(__dirname + '/target');

//
// Read all markdown files.
//
fs.readdirSync(__dirname).forEach(function each(file, i) {
  if (path.extname(file) !== '.eco' && path.extname(file) !== '.md') return;

  console.log('Processing file: ' + i);
  var content = fs.readFileSync(path.join(__dirname, file), 'utf-8')
    , github = ''
    , author = ''
    , module = ''
    , license = ''
    , found = false
    , alternative = false
    , original;

  content.replace(/\[[^\]]+\]\((https?:\/\/w?w?w?\.?github\.com([^)]+[^\/)#]+\/[^)#]+))\)/i, function replace(full, git, repo) {
    found = true;
    github = git;
    repo = repo.split('/').filter(Boolean);
    author = repo[0];
    module = repo[1];
  });

  //
  // Check for alternative module linking via @npm()
  //
  if (!found) {
    content.replace(/repo: \&repo ([^\n]+)/i, function replace(full, repo) {
      alternative = true;
      github = 'https://github.com/' + repo;
      repo = repo.split('/').filter(Boolean);
      author = repo[0];
    });

    content.replace(/name: \&name ([^\n]+)/i, function replace(full, mod) {
      module = mod;
    });

    if (!alternative) return console.log('Found nothing to replace in: ' + file);
  }

  request('https://raw.githubusercontent.com/' + author + '/' + module + '/master/package.json', function done (error, res, body) {
    if (res.statusCode == 200) {
      try {
        body = JSON.parse(body);
        if (body.name.toLowerCase() !== module.toLowerCase()) {
          original = body.name;
          console.log('Module name mismatch, using: ' + module);
        }
      } catch (e) { }
    }

    request('http://browsenpm.org/package/' + (original ? original : module).toLowerCase(), function done (error, res, body) {
      var $ = cheerio.load(body)
        , pkg = $('code[data-pagelet-fragment="package"]')
        , target;

      if (!!~pkg.html().indexOf('Invalid status code: 404')) return console.log('Skipping module: ' + author + '/' + module);

      pkg = cheerio.load(pkg.html().slice(5, -5));
      license = pkg('header aside.row .part strong').text();

      target = !alternative
        ? /\[[^\]]+\]\((https?:\/\/w?w?w?\.?github\.com([^)]+[^\/)#]+\/[^)#]+))\)/i
        : '<%- @npm() %>';

      content = content.replace(target, function replace() {
        return [
          '[',
          module,
          '][browsenpm] (Github: [',
          author,
          '/',
          module,
          '][github], License: ',
          license,
          ')'
        ].join('')
      }).replace(new RegExp('\\(' + github + '\\)', 'g'), '[github]').replace(/\n+$/, [
        '\n\n[browsenpm]: http://browsenpm.org/package/',
        original ? original : module,
        '\n[github]: https://github.com/',
        author,
        '/',
        module
      ].join(''));

      console.log('Writing file:' + file);
      fs.writeFileSync(__dirname + '/target/' + file, content);
    });
  });
});