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;;; guile.el --- Emacs Guile interface
;; Copyright (C) 2001 Keisuke Nishida <kxn30@po.cwru.edu>
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free
;;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
;;;; 02111-1307 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))))
;;;
;;; 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))
;;;
;;; 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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