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;;; apply_macro.clj: make macros behave like functions
;; by Stuart Sierra, http://stuartsierra.com/
;; January 28, 2009
;; Copyright (c) Stuart Sierra, 2009. All rights reserved. The use
;; and distribution terms for this software are covered by the Eclipse
;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this
;; distribution. By using this software in any fashion, you are
;; agreeing to be bound by the terms of this license. You must not
;; remove this notice, or any other, from this software.
;; Don't use this. I mean it. It's evil. How evil? You can't
;; handle it, that's how evil it is. That's right. I did it so you
;; don't have to, ok? Look but don't touch. Use this lib and you'll
;; go blind.
(ns clojure.contrib.apply-macro)
;; Copied from clojure.core/spread, which is private.
(defn- spread
"Flatten final argument list as in apply."
[arglist]
(cond
(nil? arglist) nil
(nil? (rest arglist)) (seq (first arglist))
:else (cons (first arglist) (spread (rest arglist)))))
(defmacro apply-macro
"This is evil. Don't ever use it. It makes a macro behave like a
function. Seriously, how messed up is that?
Evaluates all args, then uses them as arguments to the macro as with
apply.
(def things [true true false])
(apply-macro and things)
;; Expands to: (and true true false)"
[macro & args]
(cons macro (spread (map eval args))))
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