My 12 line “publishing platform”

gistfile1.rb

Dir.glob 'articles/*.md' do |path|
  content = File.read(path)
  slug    = File.basename(path, ".md")
  matches = /^# (.*)$/.match(content)
  title   = matches && matches[1] || slug
  get "/articles/#{slug}" do
    erb :article, :locals => {
      :title   => title,
      :content => markdown(content)
    }
  end
end