After importing from Wordpress to Jekyll, you get your posts and pages in html format, without any hard line wraps. I wanted to get the files into markdown format and wrap the lines at 120 characters wide so I could edit it nicely in my IDE. I also have like 500 pages to convert, so doing it by hand was a nonstarter...

jekyll_import_converter.rb

require 'html2markdown' #gem install html2markdown

dirs = %w(_pages _posts)

class String
  def word_wrap(line_width = 120)
    self.split("\n").collect do |line|
      line.length > line_width ? line.gsub(/(.{1,#{line_width}})(\s+|$)/, "\\1\n").strip : line
    end * "\n"
  end
end

def md(file_name)
  file_name.chomp(File.extname(file_name)) + '.md'
end

dirs.each do |dir|
  Dir.open(dir) do |d_handle|
    d_handle.reject{ |f| f == '.' || f == '..' }.each do |file_name|

      content = HTMLPage.new(:contents => File.read("#{dir}/#{file_name}"))
      File.write("#{dir}/#{md(file_name)}", content.markdown.word_wrap)

    end
  end
end