--- /dev/null
+;;; guile.el --- Emacs Guile interface
+
+;; Copyright (C) 2001 Keisuke Nishida <kxn30@po.cwru.edu>
+
+;; GNU Emacs 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 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Code:
+
+(require 'cl)
+
+;;;
+;;; Low level interface
+;;;
+
+(defvar guile-emacs-file
+ (catch 'return
+ (mapc (lambda (dir)
+ (let ((file (expand-file-name "guile-emacs.scm" dir)))
+ (if (file-exists-p file) (throw 'return file))))
+ load-path)
+ (error "Cannot find guile-emacs.scm")))
+
+(defvar guile-channel-file
+ (catch 'return
+ (mapc (lambda (dir)
+ (let ((file (expand-file-name "channel.scm" dir)))
+ (if (file-exists-p file) (throw 'return file))))
+ load-path)
+ (error "Cannot find channel.scm")))
+
+(defvar guile-libs
+ (nconc (if guile-channel-file (list "-l" guile-channel-file) '())
+ (list "-l" guile-emacs-file)))
+
+;;;###autoload
+(defun guile:make-adapter (command channel)
+ (let* ((buff (generate-new-buffer " *guile object channel*"))
+ (libs (if guile-channel-file (list "-l" guile-channel-file) nil))
+ (proc (apply 'start-process "guile-oa" buff command "-q" guile-libs)))
+ (process-kill-without-query proc)
+ (accept-process-output proc)
+ (guile-process-require proc (format "(%s)\n" channel) "channel> ")
+ proc))
+
+(put 'guile-error 'error-conditions '(guile-error error))
+(put 'guile-error 'error-message "Guile error")
+
+(defvar guile-token-tag "<guile>")
+
+(defun guile-tokenp (x) (and (consp x) (eq (car x) guile-token-tag)))
+
+;;;###autoload
+(defun guile:eval (string adapter)
+ (condition-case error
+ (let ((output (guile-process-require adapter (concat "eval " string "\n")
+ "channel> ")))
+ (cond
+ ((string= output "") nil)
+ ((string-match "^\\(\\(value\\)\\|\\(token\\)\\|\\(exception\\)\\) = "
+ output)
+ (cond
+ ;; value
+ ((match-beginning 2)
+ (car (read-from-string (substring output (match-end 0)))))
+ ;; token
+ ((match-beginning 3)
+ (cons guile-token-tag
+ (car (read-from-string (substring output (match-end 0))))))
+ ;; exception
+ ((match-beginning 4)
+ (signal 'guile-error
+ (car (read-from-string (substring output (match-end 0))))))))
+ (t
+ (error "Unsupported result" output))))
+ (quit
+ (signal-process (process-id adapter) 'SIGINT)
+ (signal 'quit nil))))
+
+\f
+;;;
+;;; Guile Lisp adapter
+;;;
+
+(defvar guile-lisp-command "guile")
+(defvar guile-lisp-adapter nil)
+
+(defvar true "#t")
+(defvar false "#f")
+
+(unless (boundp 'keywordp)
+ (defun keywordp (x) (and (symbolp x) (eq (aref (symbol-name x) 0) ?:))))
+
+(defun guile-lisp-adapter ()
+ (if (and (processp guile-lisp-adapter)
+ (eq (process-status guile-lisp-adapter) 'run))
+ guile-lisp-adapter
+ (setq guile-lisp-adapter
+ (guile:make-adapter guile-lisp-command 'emacs-lisp-channel))))
+
+(defun guile-lisp-convert (x)
+ (cond
+ ((or (eq x true) (eq x false)) x)
+ ((null x) "'()")
+ ((keywordp x) (concat "#" (prin1-to-string x)))
+ ((stringp x) (prin1-to-string x))
+ ((guile-tokenp x) (cadr x))
+ ((consp x)
+ (if (null (cdr x))
+ (list (guile-lisp-convert (car x)))
+ (cons (guile-lisp-convert (car x)) (guile-lisp-convert (cdr x)))))
+ (t x)))
+
+;;;###autoload
+(defun guile-lisp-eval (form)
+ (guile:eval (format "%s" (guile-lisp-convert form)) (guile-lisp-adapter)))
+
+(defun guile-lisp-flat-eval (&rest form)
+ (let ((args (mapcar (lambda (x)
+ (if (guile-tokenp x) (cadr x) (list 'quote x)))
+ (cdr form))))
+ (guile-lisp-eval (cons (car form) args))))
+
+;;;###autoload
+(defmacro guile-import (name &optional new-name &rest opts)
+ `(guile-process-import ',name ',new-name ',opts))
+
+(defun guile-process-import (name new-name opts)
+ (let ((real (or new-name name))
+ (docs (if (memq :with-docs opts) true false)))
+ (eval (guile-lisp-eval `(guile-emacs-export ',name ',real ,docs)))))
+
+;;;###autoload
+(defmacro guile-use-module (name)
+ `(guile-lisp-eval '(use-modules ,name)))
+
+;;;###autoload
+(defmacro guile-import-module (name &rest opts)
+ `(guile-process-import-module ',name ',opts))
+
+(defun guile-process-import-module (name opts)
+ (unless (boundp 'guile-emacs-export-procedures)
+ (guile-import guile-emacs-export-procedures))
+ (let ((docs (if (memq :with-docs opts) true false)))
+ (guile-lisp-eval `(use-modules ,name))
+ (eval (guile-emacs-export-procedures name docs))
+ name))
+
+\f
+;;;
+;;; Process handling
+;;;
+
+(defvar guile-process-output-start nil)
+(defvar guile-process-output-value nil)
+(defvar guile-process-output-finished nil)
+(defvar guile-process-output-separator nil)
+
+(defun guile-process-require (process string separator)
+ (setq guile-process-output-value nil)
+ (setq guile-process-output-finished nil)
+ (setq guile-process-output-separator separator)
+ (let (temp-buffer)
+ (unless (process-buffer process)
+ (setq temp-buffer (guile-temp-buffer))
+ (set-process-buffer process temp-buffer))
+ (with-current-buffer (process-buffer process)
+ (goto-char (point-max))
+ (insert string)
+ (setq guile-process-output-start (point))
+ (set-process-filter process 'guile-process-filter)
+ (process-send-string process string)
+ (while (not guile-process-output-finished)
+ (unless (accept-process-output process 3)
+ (when (> (point) guile-process-output-start)
+ (display-buffer (current-buffer))
+ (error "BUG in Guile object channel!!")))))
+ (when temp-buffer
+ (set-process-buffer process nil)
+ (kill-buffer temp-buffer)))
+ guile-process-output-value)
+
+(defun guile-process-filter (process string)
+ (with-current-buffer (process-buffer process)
+ (insert string)
+ (forward-line -1)
+ (if (< (point) guile-process-output-start)
+ (goto-char guile-process-output-start))
+ (when (re-search-forward guile-process-output-separator nil 0)
+ (goto-char (match-beginning 0))
+ (setq guile-process-output-value
+ (buffer-substring guile-process-output-start (point)))
+ (setq guile-process-output-finished t))))
+
+(defun guile-process-kill (process)
+ (set-process-filter process nil)
+ (delete-process process)
+ (if (process-buffer process)
+ (kill-buffer (process-buffer process))))
+
+(provide 'guile)
+
+;;; guile.el ends here
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