Add support for including Guile files.

* module/mes/guile.mes: New file.
* module/mes/pretty-print.mes: New file.

module/mes/guile.mes

@@ -0,0 +1,62 @@
+;;; -*-scheme-*-
+
+;;; Mes --- Maxwell Equations of Software
+;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of Mes.
+;;;
+;;; Mes 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.
+;;;
+;;; Mes 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 Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(define-macro (define-module module . rest) #t)
+(define-macro (use-modules . rest) #t)
+
+(define (port-filename p) "<stdin>")
+(define (port-line p) 0)
+(define (simple-format port format . rest) (map (lambda (x) (display x port)) rest))
+
+(define (with-input-from-string string thunk)
+  (define save-peek-char peek-char)
+  (define save-read-char read-char)
+  (define save-unread-char unread-char)
+  (let ((tell 0)
+        (end (string-length string)))
+    (set! peek-char
+          (lambda () (if (= tell end) (integer->char -1)
+                         (string-ref string (- tell 1)))))
+    (set! read-char
+          (lambda () (if (= tell end) (integer->char -1)
+                         (begin
+                           (set! tell (1+ tell))
+                           (string-ref string (- tell 1))))))
+    (set! unread-char
+          (lambda (c) (set! tell (1- tell)) c)))
+  (let ((r (thunk)))
+    (set! peek-char save-peek-char)
+    (set! read-char save-read-char)
+    (set! unread-char save-unread-char)
+    r))
+
+(define (with-input-from-file file thunk)
+  (let ((port (open-input-file file)))
+    (if (= port -1)
+        (begin (display "no such file:") (display file) (newline))
+        (let* ((save (current-input-port))
+               (foo (set-current-input-port port))
+               (r (thunk)))
+          (set-current-input-port save)
+          r))))

module/mes/pretty-print.mes

@@ -0,0 +1,29 @@
+;;; -*-scheme-*-
+
+;;; Mes --- Maxwell Equations of Software
+;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of Mes.
+;;;
+;;; Mes 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.
+;;;
+;;; Mes 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 Mes.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; base-0.mes is the first file being loaded from the Mes core.  It
+;;; provides primitives that use Mes internals to create the illusion
+;;; of compatibility with Guile.  It is not safe to be run by Guile.
+
+;;; Code:
+
+(define pretty-print display)