Support for multiple Scheme implementations, Chapter 1.

  * Evaluation system is now pluggable
  * The rest of the system understands said pluggability
  * Guile provides its own implementation (geiser-guile)
  * The reload system is aware of the new kids on the block

1 files changed, 105 insertions, 0 deletions

diff --git a/elisp/geiser-guile.el b/elisp/geiser-guile.el
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+;; geiser-guile.el -- guile's implementation of the geiser protocols
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sun Mar 08, 2009 23:03
+
+;; 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:
+
+;; Implementation of all required Elisp Geiser protocols for Guile.
+
+;;; Code:
+
+(require 'geiser-impl)
+(require 'geiser-syntax)
+(require 'geiser-custom)
+(require 'geiser-base)
+
+
+;;; Customization:
+
+(defgroup geiser-guile nil
+  "Customization for Geiser's Guile flavour."
+  :group 'geiser)
+
+(defcustom geiser-guile-binary
+  (cond ((eq system-type 'windows-nt) "guile.exe")
+        ((eq system-type 'darwin) "guile")
+        (t "guile"))
+  "Name to use to call the Guile executable when starting a REPL."
+  :type 'string
+  :group 'geiser-guile)
+
+(defcustom geiser-guile-init-file "~/.guile-geiser"
+  "Initialization file with user code for the Guile REPL."
+  :type 'string
+  :group 'geiser-guile)
+
+
+;;; REPL support:
+
+(defun geiser-guile-parameters ()
+  "Return a list with all parameters needed to start Guile.
+This function uses `geiser-guile-init-file' if it exists."
+  (let ((init-file (and (stringp geiser-guile-init-file)
+                        (expand-file-name geiser-guile-init-file))))
+  `("-p" "-L" ,(expand-file-name "guile/" geiser-scheme-dir)
+    ,@(and init-file (file-readable-p init-file) (list "-l" init-file)))))
+
+(defconst geiser-guile-prompt-regexp "^[^() \n]+@([^)]*?)> ")
+
+
+;;; Evaluation support:
+
+(defun geiser-guile-geiser-procedure (proc)
+  "Translate a bare procedure symbol to one executable in Guile's
+context. Return NULL for unsupported ones; at the very least,
+EVAL, COMPILE, LOAD-FILE and COMPILE-FILE should be supported."
+  (let ((proc (intern (format "ge:%s" proc))))
+    `(@ (geiser emacs) ,proc)))
+
+(defconst geiser-guile--module-re
+  "(define-module +\\(([^)]+)\\)")
+
+(defun geiser-guile-get-module (&optional module)
+  "Return a scheme datum representing the current module.
+If MODULE is provided, transform it to such a datum."
+  (cond ((null module)
+         (save-excursion
+           (goto-char (point-min))
+           (if (re-search-forward geiser-guile--module-re nil t)
+               (geiser-guile-get-module (match-string-no-properties 1))
+             :f)))
+        ((listp module) module)
+        ((stringp module) (or (ignore-errors (car (read-from-string module))) :f))
+        (t :f)))
+
+
+;;; Trying to ascertain whether a buffer is Guile Scheme:
+
+(defun geiser-guile-guess ()
+  "Return `t' if the current buffer looks like a Guile file."
+  (and (geiser-guile-get-module) t))
+
+
+;;; Register this implementation:
+
+(geiser-impl--register 'guile)
+
+
+(provide 'geiser-guile)
+;;; geiser-guile.el ends here