Sinatra basic file uploader

uploader.rb

#!/usr/bin/env ruby

require 'sinatra'
require 'haml'

get "/upload" do
  haml :upload
end

post "/upload" do 
  file_name = settings.root + "/public/uploads/" + params[:file][:filename]
  File.open(file_name, "w") { |f| f.write(params[:file][:tempfile]) }
  "Success! " + haml("%a{:href => '' } Upload ") + "something else."
end


__END__

@@ upload
%html
  %body
    %form{:action => "", :method => "post", :enctype => 'multipart/form-data'}
      %label{:for => 'file'}Choose a file: 
      %br
      %input{:type => "file", :name => "file"}
      %br
      %input{:type => "submit", :value => "upload"}