modules/utils/generateIndex.js from mjackson/mach

modules/utils/generateIndex.js
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var fs = require('fs');
var Promise = require('./Promise');
var getFileStats = require('./getFileStats');
var getMimeType = require('./getMimeType');
var formatByteSize = require('./formatByteSize');
var formatString = require('util').format;
var joinPaths = require('./joinPaths');

var MACH_VERSION = require('../version');

var PAGE_TEMPLATE = [
  '<html>',
  '<head>',
  '<meta http-equiv="content-type" content="text/html; charset=utf-8" />',
  '<title>%s</title>',
  '<style type="text/css">',
  '  body { font: 14px Helvetica, Arial, sans-serif; padding: 0 10px; }',
  '  address { text-align: right; font-style: italic; }',
  '  table { width: 100%; }',
  '  tr.even { background: #f3f3f3; }',
  '  .name { text-align: left; }',
  '  .size, .type, .mtime { text-align: right; }',
  '</style>',
  '</head>',
  '<body>',
  '<h1>%s</h1>',
  '<hr>',
  '<table cellspacing="0" cellpadding="3">',
  '<tr>',
  '  <th class="name">Name</th>',
  '  <th class="size">Size</th>',
  '  <th class="type">Type</th>',
  '  <th class="mtime">Last Modified</th>',
  '</tr>',
  '%s',
  '</table>',
  '<hr>',
  '<address>%s/%s</address>',
  '</body>',
  '</html>'
].join('\n');

var ROW_TEMPLATE = [
  '<tr class="%s">',
  '  <td class="name"><a href="%s">%s</a></td>',
  '  <td class="size">%s</td>',
  '  <td class="type">%s</td>',
  '  <td class="mtime">%s</td>',
  '</tr>'
].join('\n');

function generateIndex(root, pathname, basename) {
  return new Promise(function (resolve, reject) {
    var path = joinPaths(root, pathname);

    fs.readdir(path, function (error, files) {
      if (error)
        return reject(error);

      var promises = files.map(function (file) {
        return getFileStats(joinPaths(path, file));
      });

      Promise.all(promises).then(function (statsArray) {
        var rows = formatString(ROW_TEMPLATE, '', '../', 'Parent Directory', '', '', '');
        var className = 'even';

        statsArray.forEach(function (stats, index) {
          if (stats == null)
            return; // Ignore broken symlinks!

          var file = files[index];
          var url = basename + pathname + file;
          var mtime = stats.mtime;

          var size, type;
          if (stats.isDirectory()) {
            size = '-';
            type = 'directory';
            url += '/';
            file += '/';
          } else {
            size = formatByteSize(stats.size);
            type = getMimeType(file);
          }

          rows += '\n' + formatString(ROW_TEMPLATE, className, url, file, size, type, mtime);

          className = (className === 'even') ? 'odd' : 'even';
        });

        var title = 'Index of ' + basename + pathname;
        var content = formatString(PAGE_TEMPLATE, title, title, rows, 'mach', MACH_VERSION);

        resolve(content);
      }, reject);
    });
  });
}

module.exports = generateIndex;