1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/clojure/contrib/apply_macro.clj	Sat Aug 21 06:25:44 2010 -0400
     1.3 @@ -0,0 +1,45 @@
     1.4 +;;; apply_macro.clj: make macros behave like functions
     1.5 +
     1.6 +;; by Stuart Sierra, http://stuartsierra.com/
     1.7 +;; January 28, 2009
     1.8 +
     1.9 +;; Copyright (c) Stuart Sierra, 2009. All rights reserved.  The use
    1.10 +;; and distribution terms for this software are covered by the Eclipse
    1.11 +;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
    1.12 +;; which can be found in the file epl-v10.html at the root of this
    1.13 +;; distribution.  By using this software in any fashion, you are
    1.14 +;; agreeing to be bound by the terms of this license.  You must not
    1.15 +;; remove this notice, or any other, from this software.
    1.16 +
    1.17 +
    1.18 +;; Don't use this.  I mean it.  It's evil.  How evil?  You can't
    1.19 +;; handle it, that's how evil it is.  That's right.  I did it so you
    1.20 +;; don't have to, ok?  Look but don't touch.  Use this lib and you'll
    1.21 +;; go blind.
    1.22 +
    1.23 +;; DEPRECATED in 1.2 with no replacement.
    1.24 +
    1.25 +(ns ^{:deprecated "1.2"}
    1.26 +  clojure.contrib.apply-macro)
    1.27 +
    1.28 +;; Copied from clojure.core/spread, which is private.
    1.29 +(defn- spread
    1.30 +  "Flatten final argument list as in apply."
    1.31 +  [arglist]
    1.32 +  (cond
    1.33 +   (nil? arglist) nil
    1.34 +   (nil? (rest arglist)) (seq (first arglist))
    1.35 +   :else (cons (first arglist) (spread (rest arglist)))))
    1.36 +
    1.37 +(defmacro apply-macro
    1.38 +  "This is evil.  Don't ever use it.  It makes a macro behave like a
    1.39 +  function.  Seriously, how messed up is that?
    1.40 +
    1.41 +  Evaluates all args, then uses them as arguments to the macro as with
    1.42 +  apply.
    1.43 +
    1.44 +  (def things [true true false])
    1.45 +  (apply-macro and things)
    1.46 +  ;; Expands to:  (and true true false)"
    1.47 +  [macro & args]
    1.48 +  (cons macro (spread (map eval args))))