gistfile1.rb

#!/usr/bin/env ruby

require 'kramdown'
require 'date'

source = ARGV[0]
destination = ARGV[1]

Dir.chdir(source) do |dir|
  @posts = []
  Dir.glob("20*.md") do |md_file|
    post = File.read(md_file)
    html_file = File.basename(md_file, '.md') + '.html'
    File.open(File.join([destination, html_file]), 'w+') do |f|

      # 2012-01-02-title-of-my-post.md
      date = md_file[0,10]
      @title = md_file[11..-4].gsub('-', ' ')
      @posts << { :title => @title, :slug => html_file, :date => date }

      @content = Kramdown::Document.new(post).to_html
      f.write ERB.new(File.read(File.join([source, 'layout.html.erb']))).result(binding)
    end
  end
  
  File.open(File.join([destination, 'index.html']), 'w+') do |f|
    f.write ERB.new(File.read(File.join([source, 'archive.html.erb']))).result(binding)
  end
end