On Sun, Nov 2, 2008 at 6:34 PM, Mark McGranaghan <[EMAIL PROTECTED]> wrote:
>
> I really like being able to find and check documentation in the REPL
> with find-doc and doc, but I often would like to see the source code
> of a function or macro to be able to understand it better or learn
> from the implementation.
(import '(java.io LineNumberReader InputStreamReader PushbackReader)
'(clojure.lang RT))
(defn get-source [vn]
(let [m ^(resolve vn)
strm (.getResourceAsStream (RT/baseLoader) (str "clojure/" (:file m)))]
(if (and m strm)
(with-open rdr (LineNumberReader. (InputStreamReader. strm))
(dotimes _ (dec (:line m)) (.readLine rdr))
(.mark rdr 2000)
(read (PushbackReader. rdr))
(let [cnt (- (.getLineNumber rdr) (:line m))]
(.reset rdr)
(dotimes _ cnt (println (.readLine rdr)))
true))
(println "Source not found for" vn))))
(defmacro source [n]
`(get-source '~n))
It's not pretty, and it only works on functions defined in the clojure
namespace. But it does work, without requiring any changes to Clojure
itself:
user=> (source filter)
(defn filter
"Returns a lazy seq of the items in coll for which
(pred item) returns true. pred must be free of side-effects."
[pred coll]
(when (seq coll)
(if (pred (first coll))
true
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