Import a blogger archive to jekyll

import.rb

require 'rubygems'
require 'nokogiri'
require 'fileutils'
require 'date'

# usage: ruby import.rb my-blog.xml
# my-blog.xml is a file from Settings -> Basic -> Export in blogger.

data = File.read ARGV[0]
doc = Nokogiri::XML(data)

@posts = {}

def add(node)
  id = node.search('id').first.content
  type = node.search('category').first.attr('term').split('#').last
  case type
  when 'post'
    @posts[id] = Post.new(node)
  when 'comment'
    reply_to = node.children.find {|c| c.name == 'in-reply-to' }
    post_id = reply_to.attr('ref')
    #post_id = node.search('thr').first.attr('ref')
    @posts[post_id].add_comment(Comment.new(node))
  when 'template', 'settings'
  else
    raise 'dunno '+type
  end
end

def write(post)
  puts "Post [#{post.title}] has #{post.comments.count} comments"

  puts "writing #{post.file_name}"
  File.open(File.join('_posts', post.file_name), 'w') do |file|
    file.write post.header
    file.write "\n\n"
    file.write "<h1>{{ page.title }}</h1>\n"
    file.write "<div class='post'>\n"
    file.write post.content
    file.write "</div>\n"
    file.write "<h2>Comments</h2>\n"
    file.write "<div class='comments'>\n"
    post.comments.each do |comment|
      file.write "<div class='comment'>\n"
      file.write "<div class='author'>"
      file.write comment.author
      file.write "</div>\n"
      file.write "<div class='content'>\n"
      file.write comment.content
      file.write "</div>\n"
      file.write "</div>\n"
    end
    file.write "</div>\n"
  end
end

class Post
  attr_reader :comments
  def initialize(node)
    @node = node
    @comments = []
  end

  def add_comment(comment)
    @comments.unshift comment
  end

  def title
    @node.search('title').first.content
  end

  def content
    @node.search('content').first.content
  end

  def creation_date
    creation_datetime.strftime("%Y-%m-%d")
  end

  def creation_datetime
    Date.parse(@node.search('published').first.content)
  end

  def file_name
    param_name = title.split(/[^a-zA-Z0-9]+/).join('-').downcase
    %{#{creation_date}-#{param_name}.html}
  end

  def header
    [
      '---',
      %{layout: post},
      %{title: #{title}},
      %{date: #{creation_datetime}},
      %{comments: false},
      '---'
    ].join("\n")
  end
end

class Comment
  def initialize(node)
    @node = node
  end

  def author
    @node.search('author name').first.content
  end

  def content
    @node.search('content').first.content
  end
end

entries = {} 

doc.search('entry').each do |entry|
  add entry
end

FileUtils.rm_rf('_posts')
Dir.mkdir("_posts") unless File.directory?("_posts")

@posts.each do |id, post|
  write post
end

This script is great and saved me a lot of time. One minor nitpick: it doesn't translate colons in the YAML front-matter to an : entity.

This script helped me alot!
But I had to fix for when the node type is 'page'. Other than that, it worked perfectly.
Kudos!

When I run your script, I get the following error:

[orschiro@thinkpad Blogger to Github]$ ruby import.rb blog-08-03-2013.xml 
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.9.1
import.rb:27:in `add': dunno page (RuntimeError)
    from import.rb:119:in `block in <main>'
    from /home/orschiro/.gem/ruby/2.0.0/gems/nokogiri-1.6.0/lib/nokogiri/xml/node_set.rb:237:in `block in each'
    from /home/orschiro/.gem/ruby/2.0.0/gems/nokogiri-1.6.0/lib/nokogiri/xml/node_set.rb:236:in `upto'
    from /home/orschiro/.gem/ruby/2.0.0/gems/nokogiri-1.6.0/lib/nokogiri/xml/node_set.rb:236:in `each'
    from import.rb:118:in `<main>'

Can you please help me on this?

I was able to fix the error @OrShiro is referring to by changing line 25 to:

when 'template', 'settings', 'page'