Pastable version of Brainfuck Generator in Ruby

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            <pre class="sunburst"><span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> generate_bf.rb</span>
<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> (copyleft) Matt Gauger 2008</span>
<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> Randomly generates a brainfuck program</span>
<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> Commandline argument is used as the length of the program</span>
<span style="color:#AEAEAE;font-style:italic;"><span style="color:#AEAEAE;font-style:italic;">#</span> Otherwise, the program defaults to 140 characters in length to fit on Twitter</span>

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            <span style="margin:0;padding:4px 6px;font-size:12px;float:right;">!! generated Brainfuck code not guaranteed to do anything !!</span>
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length <span style="color:#E28964;">=</span> <span style="color:#3387CC;">140</span>
program <span style="color:#E28964;">=</span> <span style="color:#65B042;"><span style="color:#65B042;">&quot;</span><span style="color:#65B042;">&quot;</span></span>

<span style="color:#3E87E3;">ARGV</span>.<span style="color:#89BDFF;">each</span> <span style="color:#E28964;">do </span>|<span style="color:#3E87E3;">n</span>|
  <span style="color:#E28964;">if</span> n <span style="color:#E28964;">!=</span> <span style="color:#3387CC;">nil</span> <span style="color:#E28964;">and</span> n <span style="color:#E28964;">!=</span> <span style="color:#3387CC;">0</span>
    length <span style="color:#E28964;">=</span> n.<span style="color:#89BDFF;">to_i</span>
  <span style="color:#E28964;">end</span>
<span style="color:#E28964;">end</span>

length.<span style="color:#89BDFF;">downto</span>(<span style="color:#3387CC;">1</span>) { |<span style="color:#3E87E3;">n</span>| 
  choice <span style="color:#E28964;">=</span> <span style="color:#89BDFF;">rand</span>(<span style="color:#3387CC;">7</span>)
  
  <span style="color:#E28964;">case</span> choice
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">0</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>&gt;<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">1</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>&lt;<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">2</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>+<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">3</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>-<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">4</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>.<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">5</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>,<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">6</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>[<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">when</span> <span style="color:#3387CC;">7</span>
      program.<span style="color:#89BDFF;">concat</span>(<span style="color:#65B042;"><span style="color:#65B042;">'</span>]<span style="color:#65B042;">'</span></span>)
    <span style="color:#E28964;">else</span>
  <span style="color:#E28964;">end</span>
}

puts program
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