I'm learning macros, and I've figured something out that works for
what I want to do but looks awfully weird. Is this a hacky mess
because I don't know the clean way to do it or an idiom I just need to
get used to?
I want a macro expansion to define some functions in the namespace of
the "caller." I think I need syntax-quoting because I need to drop
some arguments in place, but since syntax-quoting namespace-qualifies
symbols with the namespace of the macro, I'm using a let to also drop
in the symbols that I don't want namespace-qualified. Here's a simple
example that shows what I'm talking about:
(ns foo)
(defmacro defthing [s]
(let [thing-name 'thing]
`(def ~thing-name (format "the %s thing" ~s))))
(ns bar)
(foo/defthing "Bar")
(ns user)
(foo/defthing "User")
thing
=> "the User thing"
bar/thing
=> "the Bar thing"
So this works, and that's great, but that let is pretty gross. Am I
missing a cleaner way?
Thanks.
-hume.
--
http://elhumidor.blogspot.com/
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