I use a similar macro in my music
code<https://github.com/ctford/leipzig/blob/master/src/leipzig/scale.clj>,
because I want to take a sequence and explicitly give parts of it names.
(defmacro defs [names docstring values]
`(do ~@(map
(fn [name value] `(def ~name ~docstring ~value))
names (eval values))))
(defs
[C D E F G A B]
"A key, expressed as a translation function."
(map
(comp from (from 60) major)
(range)))
This macro is not part of the public API. :-)
On 23 July 2013 10:52, Alex Baranosky <[email protected]> wrote:
> Good point BG,
>
> I think it is almost certainly not a good idea :) But educational,
> definitely.
>
>
> On Tue, Jul 23, 2013 at 12:48 AM, Baishampayan Ghose <[email protected]>wrote:
>
>> Since the bindings are a function of the data that's passed in, IMO
>> you don't need a anaphoric macro for this.
>>
>> For example -
>>
>> (defmacro def-names [names & body]
>> (let [bindings* (vec (mapcat (juxt symbol identity) names))]
>> `(let ~bindings*
>> ~@body)))
>>
>> As to whether it's a good idea or not, I'd say it depends but YMMV.
>>
>> Regards,
>> BG
>>
>> On Tue, Jul 23, 2013 at 12:48 PM, <[email protected]> wrote:
>> > Hi,
>> > I want to write a macro that introduces new variables from data.
>> > The data is a vector and looks like this for example: ["a" "b" "c"]
>> >
>> > I want to use the macro like this:
>> > (def-names ["a" "b" "c"] (str a b))
>> >
>> > What code I want the macro to produce from the above is the following:
>> > (let [a "a"
>> > b "b"
>> > c "c"]
>> > (str a b))
>> >
>> > Is it possible to do that?
>> > Is it a good thing to do that or is it bad practice?
>> >
>> > Thanks
>> > --anders
>> >
>> >
>> >
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>> --
>> Baishampayan Ghose
>> b.ghose at gmail.com
>>
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