How to write a macro

[John Ky]

Hi all,

I'm looking for a way to write a defkw macro so that (defkw ABSENT) expands to
(def ABSENT (kw "ABSENT" :ABSENT )).

Thanks,

-John

[Alex Osborne]

John Ky wrote:
> Hi all,
>
> I'm looking for a way to write a defkw macro so that (defkw ABSENT)
> expands to
> (def ABSENT (kw "ABSENT" :ABSENT )).
>

Just use `(...) as a template and use ~ to unescape, like so:

(defmacro defkw [sym]
`(def ~sym (kw ~(str sym) ~(keyword sym))))

(defkw ANSEMT)
=> (def ABSENT (kw "ABSENT" :ABSENT))

[John Ky]

Hi Alex,

I had to ~(keyword (str sym)) instead of ~(keyword sym), but now it works well.

Cheers,

-John

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[Alex Osborne]

John Ky wrote:
> I had to ~(keyword (str sym)) instead of ~(keyword sym), but now it
> works well.

Hmm, odd. Must have changed since Clojure 1.0. (keyword 'some-symbol)
works for me on the "new" branch.