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+;; eval.scm -- evaluation procedures
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Fri Feb 06, 2009 22:54
+
+;; 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:
+
+;; Module defining evaluation procedures called from the Emacs side.
+
+;;; Code:
+
+(define-module (geiser eval)
+  #:export (eval-in))
+
+(define (eval-in form module-name)
+  "Evals FORM in the module designated by MODULE-NAME.
+If MODULE-NAME is #f or resolution fails, the current module is used instead.
+The result is a list of the form ((RESULT . <form-value>))
+if no evaluation error happens, or ((ERROR <error-key> <error-arg>...))
+in case of errors."
+  (let ((module (or (and module-name (resolve-module module-name))
+                    (current-module))))
+    (catch #t
+      (lambda () (list (cons 'result (eval form module))))
+      (lambda (key . args) (list (cons 'error (cons key args)))))))
+
+;;; eval.scm ends here