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  <h2>Clojure mode</h2>
  <form><textarea id="code" name="code">
  ; Conway's Game of Life, based on the work of:
  ;; Laurent Petit https://gist.github.com/1200343
  ;; Christophe Grand http://clj-me.cgrand.net/2011/08/19/conways-game-of-life
  
  (ns ^{:doc "Conway's Game of Life."}
   game-of-life)
  
  ;; Core game of life's algorithm functions
  
  (defn neighbours
    "Given a cell's coordinates, returns the coordinates of its neighbours."
    [[x y]]
    (for [dx [-1 0 1] dy (if (zero? dx) [-1 1] [-1 0 1])]
      [(+ dx x) (+ dy y)]))
  
  (defn step
    "Given a set of living cells, computes the new set of living cells."
    [cells]
    (set (for [[cell n] (frequencies (mapcat neighbours cells))
               :when (or (= n 3) (and (= n 2) (cells cell)))]
           cell)))
  
  ;; Utility methods for displaying game on a text terminal
  
  (defn print-board
    "Prints a board on *out*, representing a step in the game."
    [board w h]
    (doseq [x (range (inc w)) y (range (inc h))]
      (if (= y 0) (print "\n"))
      (print (if (board [x y]) "[X]" " . "))))
  
  (defn display-grids
    "Prints a squence of boards on *out*, representing several steps."
    [grids w h]
    (doseq [board grids]
      (print-board board w h)
      (print "\n")))
  
  ;; Launches an example board
  
  (def
    ^{:doc "board represents the initial set of living cells"}
     board #{[2 1] [2 2] [2 3]})
  
  (display-grids (take 3 (iterate step board)) 5 5)
  
  ;; Let's play with characters
  (println \1 \a \# \\
           \" \( \newline
           \} \" \space
           \tab \return \backspace
           \u1000 \uAaAa \u9F9F)
  
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      <p><strong>MIME types defined:</strong> <code>text/x-clojure</code>.</p>
  
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