On Sep 19, 2010, at 11:45 AM, Steven E. Harris wrote:
> Moritz Ulrich <ulrich.mor...@googlemail.com> writes:
>
>> I think this would be a very nice extension for the repl - Saving the
>> forms for later-retrieval.
>
> As precedent, the Common Lisp reader uses the +, ++, and +++ variables¹
> to store the last three forms read.
An early draft of the current clojure repl included a feature like that. At the
time it was judged not sufficiently useful to keep.
The clojure repl is very customizable. It's possible to add this feature in a
custom repl to experiment with the idea:
(declare r1 r2 r3)
(defn saving-repl-read [request-prompt request-exit]
(let [r (clojure.main/repl-read request-prompt request-exit)]
(cond (#{request-prompt request-exit} r) r
(#{'+ '++ '+++} r) `(quote ~({'+ r1 '++ r2 '+++ r3} r))
:else (do (set! r3 r2) (set! r2 r1) (set! r1 r) r))))
(binding [r1 nil r2 nil r3 nil]
(clojure.main/repl :read saving-repl-read))
-------------
user=> 1
1
user=> (/ 22 7)
22/7
user=> (java.util.UUID/randomUUID)
#<UUID fd91090a-8336-4a32-91e2-2c49e114177a>
user=> ++
(/ 22 7)
user=>
-------------
Following the clojure repl's precedent of *1 *2 and *3, these might be better
named +1 +2 and +3 if the idea gets any traction.
--Steve
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