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+;; utils.scm -- utility functions
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Mon Mar 02, 2009 01:48
+
+;; This file 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 of the License, or
+;; (at your option) any later version.
+
+;; This file 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, see <http://www.gnu.org/licenses/>.
+
+;;; Comentary:
+
+;; Some utilities used by other modules.
+
+;;; Code:
+
+(define-module (geiser utils)
+  #:export (make-location
+            symbol->object
+            pair->list
+            sort-symbols!))
+
+(define (symbol->object sym)
+  (and (symbol? sym)
+       (module-defined? (current-module) sym)
+       (module-ref (current-module) sym)))
+
+(define (pair->list pair)
+  (let loop ((d pair) (s '()))
+    (cond ((null? d) (reverse! s))
+          ((symbol? d) (reverse! (cons d s)))
+          (else (loop (cdr d) (cons (car d) s))))))
+
+(define (make-location file line)
+  (list (cons 'file (if (string? file) file '()))
+        (cons 'line (if (number? line) (+ 1 line) '()))))
+
+(define (sort-symbols! syms)
+  (let ((cmp (lambda (l r)
+               (string<? (symbol->string l) (symbol->string r)))))
+    (sort! syms cmp)))
+
+;;; utils.scm ends here