server.rb

require 'sinatra/base'

module Griki
  class Server < Sinatra::Base
    enable :static

    def initialize(repository, app=nil)
      @repository = repository
      super app
      options.root = @repository.root
    end

    get '/:file' do
      page = @repository.find(params[:file])
      page.nil?? '404' : page.to_s
    end
  end
end