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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 comp-file)
+  #:use-module (srfi srfi-1))
+
+(define (eval-in form module-name)
+  "Evals @var{form} in the module designated by @var{module-name}.
+If @var{module-name} is @var{#f} or resolution fails, the current module is used instead.
+The result is a list of the form ((RESULT . <form-value>) (OUTPUT . <string>))
+if no evaluation error happens, or ((ERROR (KEY . <error-key>) <error-arg>...))
+in case of errors. Each error arg is a cons (NAME . VALUE), where NAME includes
+SUBR, MSG and REST."
+  (let ((module (or (and module-name (resolve-module module-name))
+                    (current-module))))
+    (catch #t
+      (lambda ()
+        (let* ((result #f)
+               (output
+                (with-output-to-string
+                  (lambda ()
+                    (save-module-excursion
+                     (lambda ()
+                       (set-current-module module)
+                       (set! result (compile form))))))))
+          (list (cons 'result result) (cons 'output output))))
+      (lambda (key . args)
+        (list (cons 'error (apply parse-error (cons key args))))))))
+
+(define (parse-error key . args)
+  (let* ((len (length args))
+         (subr (and (> len 0) (first args)))
+         (msg (and (> len 1) (second args)))
+         (margs (and (> len 2) (third args)))
+         (rest (and (> len 3) (fourth args))))
+    (list (cons 'key key)
+          (cons 'subr (or subr '()))
+          (cons 'msg (if msg (apply format (cons #f (cons msg margs))) '()))
+          (cons 'rest (or rest '())))))
+
+(define (comp-file path)
+  "Compile and load file, given its full @var{path}."
+  (compile-file path))
+
+;;; eval.scm ends here