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<h1>CodeMirror: Clojure mode</h1>
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; 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) </textarea></form>
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