Scrape markdown posts from a Tumblr blog and export for Middleman

TumblrToMiddleman.groovy

/*
 * This script will scrape text posts from a Tumblr blog and export them as `.md` 
 * files with YAML frontmatter ready to be used in a Middleman blog.
 *
 * Aliases are added for the _middleman-alias_ gem so Tumblr style URLs like
 * `/post/{id}/{slug}` will redirect to the Middleman-style URL.
 * 
 * Although I built this for migrating to Middleman it should be pretty easy to
 * adapt this for any similar static site generator.
 */
import groovy.json.*

// customize these values
final targetDir = // directory where you want the downloaded files
final blog =      // your tumblr blog, e.g. foo.tumblr.com
final apiKey =    // your tumblr API key

final pageSize = 20
final postsUrl = "http://api.tumblr.com/v2/blog/${blog}/posts/text?api_key=${apiKey}&filter=raw"

def offset = 0
def totalPosts = Integer.MAX_VALUE
while(offset <= totalPosts) {
  println "fetching posts $offset..${offset + pageSize} of $totalPosts..."
  def url = new URL(postsUrl + "&offset=$offset")
  def json = new JsonSlurper().parse(url)

  json.response.posts.each { post ->
    def timestamp = new Date(post.timestamp * 1000L)
    def filename = "${timestamp.format('yyyy-MM-dd')}-${post.slug}.md"
    println "writing $filename..."
    new File(targetDir, filename).withWriter { writer ->
      writer << """\
---
title: '${post.title.replace("'", "''")}'
date: ${timestamp.format("yyyy-MM-dd'T'HH:mm:ssZ")}
tags: ${post.tags.join(", ")}
alias: ["${post.post_url.replace("http://$blog/", "")}/"]
---

${post.body}
"""
    }
  }
  
  totalPosts = json.response.total_posts
  offset += pageSize
}

How does this fit into your workflow?