gistfile1.rb

post '/new' do
  begin
    paste = save_paste(params)
    redirect "/#{paste.id}"
  rescue ArgumentError, RuntimeError => e
    liquid :new, :locals => {
      :author => params[:author],
      :desc   => params[:desc],
      :raw    => params[:raw],
      :error  => e.message
    }
  end
end

def save_paste(params)
  raise ArgumentError, "Paste is empty" if(params[:raw].empty? || params[:raw].nil?)
  
  paste = Paste.new
  
  params[:submitted] = Time.now
  [:author, :desc, :raw, :submitted].each do |i|
    paste.send("#{i}=".to_sym, params[i]) unless (params[i].empty?)
  end
  
  raise RuntimeError, "Error saving paste" unless paste.save
  
  paste
end