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diff --git a/gruel/src/scheme/gnuradio/macros-etc.scm b/gruel/src/scheme/gnuradio/macros-etc.scm
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+++ b/gruel/src/scheme/gnuradio/macros-etc.scm
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+;;; -*- scheme -*-
+;;;
+;;; Copyright 2007 Free Software Foundation, Inc.
+;;; 
+;;; This file is part of GNU Radio
+;;; 
+;;; GNU Radio is free software; you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3, or (at your option)
+;;; any later version.
+;;; 
+;;; GNU Radio is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;; 
+;;; You should have received a copy of the GNU General Public License along
+;;; with this program; if not, write to the Free Software Foundation, Inc.,
+;;; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+;;;
+
+(define-module (gnuradio macros-etc)
+  :export (atom? when unless for-each-in-file))
+
+(define (atom? obj)
+  (not (pair? obj)))
+
+(defmacro when (pred . body)
+  `(if ,pred (begin ,@body) #f))
+
+(defmacro unless (pred . body)
+  `(if (not ,pred) (begin ,@body) #f))
+
+
+(define (for-each-in-file file f)
+  (let ((port (if (port? file)
+		  file
+		  (open-input-file file))))
+    (letrec
+     ((loop
+       (lambda (port form)
+	 (cond ((eof-object? form)
+		(when (not (eq? port file))
+		      (close-input-port port))
+		#t)
+	       (else
+		(f form)
+		(set! form #f)		; for GC
+		(loop port (read port)))))))
+     (loop port (read port)))))