I've seen that and think it's awesome. This would be used for Node.js.
I whipped this up to show what a Clojure version might look like.
Basically each body form after the first is inserted where (cb) is found in
the previous form.
; Definition
(defmacro defseq
[fn-name params & body])
; Example usage
(defseq request-handler [req resp]
((. resp (set-header "Content-Type" "text/html"))
(exists "some-file.txt" (cb)))
(fn [exists]
(if exists
(read-file filename "utf8" (cb))
(. resp (end "File Not Found"))))
(fn [err data]
(if err
(. resp (end "Internal Server Error"))
(. resp (end data)))))
On Wednesday, February 6, 2013 2:13:33 PM UTC-5, Max Penet wrote:
>
> Hi,
>
> jayq includes something similar (nicer imho). It takes the form of a let
> like construct
>
> (let-deferred
> [a (jq/ajax "http://localhost:8000/1.json";)
> b (jq/ajax "http://localhost:8000/2.json";)] (do-something-with-result
> (merge a b foo)))
>
> It also supports :let and :when intermediary steps.
>
> more examples can be found here:
> https://github.com/ibdknox/jayq#jayqmacros-source
>
> and the macro:
> https://github.com/ibdknox/jayq/blob/master/src/jayq/macros.clj#L15
> https://github.com/ibdknox/jayq/blob/master/src/jayq/core.cljs#L516
>
>
> Max
>
> On Wednesday, February 6, 2013 7:45:36 PM UTC+1, da...@dsargeant.comwrote:
>>
>> I'm not to clojure/clojurescript and was wondering if anyone has taken a
>> crack at writing a macro that transforms callbacks into a sequence. There
>> is an awesome implementationion in LispyScript show here:
>> https://gist.github.com/santoshrajan/3715526. Thanks for help.
>>
>> David
>>
>
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