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diff --git a/scheme/plt/geiser/enter.ss b/scheme/plt/geiser/enter.ss
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+;;; enter.ss -- custom module loaders
+
+;; Copyright (C) 2010 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Wed Mar 31, 2010 21:53
+
+#lang scheme/base
+
+(require syntax/modcode
+         (for-syntax scheme/base))
+
+(provide get-namespace enter-module module-loader module-loaded?)
+
+(define-struct mod (name timestamp depends))
+
+(define loaded (make-hash))
+
+(define (module-loaded? path)
+  (with-handlers ((exn? (lambda (_) #f)))
+    (let ((rp (module-path-index-resolve (module-path-index-join path #f))))
+      (hash-has-key? loaded (resolved-module-path-name rp)))))
+
+(define (enter-module mod)
+  (dynamic-require mod #f)
+  (check-latest mod))
+
+(define (module-loader orig)
+  (enter-load/use-compiled orig #f))
+
+(define (notify re? path)
+  (when re?
+    (fprintf (current-error-port) " [re-loading ~a]\n" path)))
+
+(define inhibit-eval (make-parameter #f))
+
+(define (get-namespace mod)
+  (parameterize ([inhibit-eval #t])
+    (module->namespace mod)))
+
+(define ((enter-load/use-compiled orig re?) path name)
+  (when (inhibit-eval)
+    (raise (make-exn:fail "namespace not found"
+                          (current-continuation-marks))))
+  (if name
+      ;; Module load:
+      (let ([code (get-module-code path "compiled" compile
+                                   (lambda (ext loader?)
+                                     (load-extension ext)
+                                     #f)
+                                   #:notify (lambda (chosen)
+                                              (notify re? chosen)))]
+            [path (normal-case-path
+                   (simplify-path
+                    (path->complete-path path
+                                         (or (current-load-relative-directory)
+                                             (current-directory)))))])
+        ;; Record module timestamp and dependencies:
+        (let ([mod (make-mod name
+                             (get-timestamp path)
+                             (if code
+                                 (apply append
+                                        (map cdr (module-compiled-imports code)))
+                                 null))])
+          (hash-set! loaded path mod))
+        ;; Evaluate the module:
+        (eval code))
+      ;; Not a module:
+      (begin
+        (notify re? path)
+        (orig path name))))
+
+(define (get-timestamp path)
+  (file-or-directory-modify-seconds path #f (lambda () -inf.0)))
+
+(define (check-latest mod)
+  (let ([mpi (module-path-index-join mod #f)]
+        [done (make-hash)])
+    (let loop ([mpi mpi])
+      (let* ([rpath (module-path-index-resolve mpi)]
+             [path (resolved-module-path-name rpath)])
+        (when (path? path)
+	  (let ([path (normal-case-path path)])
+            (unless (hash-ref done path #f)
+              (hash-set! done path #t)
+              (let ([mod (hash-ref loaded path #f)])
+                (when mod
+                  (for-each loop (mod-depends mod))
+                  (let ([ts (get-timestamp path)])
+                    (when (ts . > . (mod-timestamp mod))
+                      (let ([orig (current-load/use-compiled)])
+                        (parameterize ([current-load/use-compiled
+                                        (enter-load/use-compiled orig #f)]
+                                       [current-module-declare-name rpath])
+                          ((enter-load/use-compiled orig #t)
+                           path
+                           (mod-name mod)))))))))))))))
+
+;;; enter.ss ends here