This helps compile Jekyll posts from Contentful

Contentful.js

var Promise = require('bluebird')
var _ = require('lodash')
var fs = require('fs')
var contentful = require('contentful')

var client = contentful.createClient({
  space: '0eybfmw2qkbf',
  accessToken: process.env.CONTENTFUL_ACCESS_TOKEN,
  host: process.env.CONTENTFUL_HOST
})
var contentType = 'post'
var layout = 'post'

var writeFile = Promise.promisify(fs.writeFile)
var unlink = Promise.promisify(fs.unlink)
var mkdir = Promise.promisify(fs.mkdir)
var readdir = Promise.promisify(fs.readdir)

var postsDir = __dirname + '/_posts'

var createPost = function (entry) {
  var fields = entry.fields

  return Promise
    .bind({
      title: _.get(fields, 'title'),
      slug: _.get(fields, 'slug'),
      excerpt: _.get(fields, 'excerpt'),
      hero: _.get(fields, 'hero.fields.file.url'),
      author_name: _.get(fields, 'author.fields.name'),
      author_photo: _.get(fields, 'author.fields.photo.fields.file.url'),
      date: _.get(fields, 'date'),
      categories: _.get(fields, 'categories'),
      body: _.get(fields, 'body')
    })
    .then(function () {
      var filename = [
        this.date,
        this.slug
      ].join('-')

      var post = [
        '---',
        'layout: ' + layout,
        'title: ' + this.title,
        'author_name: ' + this.author_name,
        'author_photo: ' + this.author_photo,
        'date: ' + this.date + ' 09:00:00 -500',
        'categories: ' + JSON.stringify(this.categories),
        'image: ' + this.hero,
        'excerpt: ' + this.excerpt,
        'published: true',
        '---',
        '',
        this.body
      ].join('\n')

      return writeFile(postsDir + '/' + filename + '.md', post)
    })
}

var createDir = function (dir) {
  return Promise
    .resolve(mkdir(dir))
    .catch({ code: 'EEXIST' }, function () {})
}

var cleanDir = function (dir) {
  return Promise
    .resolve(readdir(dir))
    .map(function (file) {
      return unlink(dir + '/' + file)
    })
}

Promise
  .bind({})
  .then(function () {
    return createDir(postsDir)
  })
  .then(function () {
    return cleanDir(postsDir)
  })
  .then(function () {
    return client.getEntries({
      content_type: contentType
    })
  })
  .then(function (resp) {
    return resp.items
  })
  .map(function (entry) {
    return createPost(entry)
  })