I just started to play with macros in Clojure. The following is a simple
example that expands to:
(on-message "topic-test" (clojure.core/fn [topic13730] (println topic13730
"test")))
To make this work I had to replace the symbol 'topic in the body with the
gensym symbol. Is this the right way to do this ?
Regards
Roger
Code:
(defn on-message [topic callback]
(callback
topic))
(defmacro listen
[topic expression]
(let [arg (gensym 'topic)
body (map (fn [el] (if (= el 'topic) arg el)) expression)]
`(on-message ~topic
(fn [~arg] (~@body)))))
(listen "topic-test" (println topic "test"))
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