jekyll_redirects.js

var lsr = require('lsr');
var path = require('path');
var fs = require('fs');
var matter = require('gray-matter');
var moment = require('moment');

var files = [];

function loadPath(loadPath) {
  var resolvedPath = path.resolve(__dirname, loadPath);
  lsr
    .sync(resolvedPath)
    .forEach(function(fileStat) {
      var filename = fileStat.path;

      if (!/\.html$/.test(filename)) return;

      var filepath = path.resolve(resolvedPath, filename);
      var text = fs.readFileSync(filepath, 'utf8');
      files.push({
        filename: path.join('/', loadPath, filename),
        text: text
      });
    });
}

[
  './2007',
  './2008',
  './2009',
  './2010',
  './2011',
  './2012',
  './2013'
].map(loadPath);

files.forEach(function(file) {
  var url = file.text.match(/url\=(.*)\"/)[1]
  url = url.substring(1, url.length - 1).replace(new RegExp('\/', 'g'), '-');
  var filepath = path.resolve(__dirname, '_posts', url + '.md');
  var text = fs.readFileSync(filepath, 'utf8');
  var doc = matter(text);

  doc.data.redirect_from = file.filename.replace('index.html', '');
  doc.data.date = moment(doc.data.date).local().format('YYYY-MM-DD');

  var md = matter.stringify(doc.content, doc.data);

  fs.writeFileSync(filepath, md, 'utf8');
});