The Randomizer™️

randomize_server.rb

#! /usr/bin/env nix-shell
#! nix-shell -i ruby -p ruby bundler --pure
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-20.03.tar.gz

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem 'sinatra'
  gem 'thin'
  gem 'haml'
end

get '/' do
  haml :index
end

post '/' do
  @choices = params[:choices]
  @choice = params[:choices].
    strip.
    split(/\n+/).
    sample

  haml :index
end

Sinatra::Application.run!

__END__

@@ index
:css
  textarea {
    min-height: 400px;
  }

  .alert-success {
    color: green;
  }

- if @choice
  %h2.alert-success
    = "The winner is \"#{@choice}\"!"

%form{action: "/", method: "POST"}
  %label
    Choices
    %div
      %textarea{name: "choices",
                required: true}
        = @choices
  %button{type: "submit"}= "Randomize!"

@@ layout
%html
  %head
    %title= "Randomizer"
  %body
    %h1
      The Randomizer

    %p
      Enter some choices below, separating each one with a newline.
    = yield