.calc-wrapper
  article.calculator
        h1 Evil Calculator

        .calc-equ-wrapper
          form action="/calculate" method="post"
            input type="number" name="number1" placeholder="Number #1"
            select name="op"
              option value="+" selected="selected" = "+"
              option value="-" = "-"
              option value="*" = "*"
              option value="/" = "/"
            input type="number" name="number2" placeholder="Number #2"
            input type="submit" value="Calculate!"
          label = "= #{session[:calc_result]}"

  article.history
    - if( session[:history] != nil ) then
      h2 History
      ul
        - session[:history].reverse_each do |c|
            li
              p = "#{c[:number1]} #{c[:op]} #{c[:number2]} = #{c[:result]}"