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;;; gds-server.el -- infrastructure for running GDS server processes
;;;; Copyright (C) 2003, 2004 Free Software Foundation, Inc.
;;;;
;;;; 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 2.1 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
;;;; Customization group setup.
(defgroup gds nil
"Customization options for Guile Emacs frontend."
:group 'scheme)
;;;; Communication with the (ossau gds-server) subprocess.
;; Subprocess output goes into the `*GDS Process*' buffer, and
;; is then read from there one form at a time. `gds-read-cursor' is
;; the buffer position of the start of the next unread form.
(defvar gds-read-cursor nil)
;; The guile executable used by the GDS server process.
(defcustom gds-guile-program "guile"
"*The guile executable used by the GDS server process."
:type 'string
:group 'gds)
(defcustom gds-scheme-directory nil
"Where GDS's Scheme code is, if not in one of the standard places."
:group 'gds
:type '(choice (const :tag "nil" nil) directory))
(defun gds-start-server (procname port protocol-handler &optional bufname)
"Start a GDS server process called PROCNAME, listening on TCP port PORT.
PROTOCOL-HANDLER should be a function that accepts and processes one
protocol form. Optional arg BUFNAME specifies the name of the buffer
that is used for process output\; if not specified the buffer name is
the same as the process name."
(with-current-buffer (get-buffer-create (or bufname procname))
(erase-buffer)
(let* ((code (format "(begin
%s
(use-modules (ossau gds-server))
(run-server %d))"
(if gds-scheme-directory
(concat "(set! %load-path (cons "
(format "%S" gds-scheme-directory)
" %load-path))")
"")
port))
(process-connection-type nil) ; use a pipe
(proc (start-process procname
(current-buffer)
gds-guile-program
"-q"
"--debug"
"-c"
code)))
(set (make-local-variable 'gds-read-cursor) (point-min))
(set (make-local-variable 'gds-protocol-handler) protocol-handler)
(set-process-filter proc (function gds-filter))
(set-process-sentinel proc (function gds-sentinel))
(set-process-coding-system proc 'latin-1-unix)
(process-kill-without-query proc)
proc)))
;; Subprocess output filter: inserts normally into the process buffer,
;; then tries to reread the output one form at a time and delegates
;; processing of each form to `gds-protocol-handler'.
(defun gds-filter (proc string)
(with-current-buffer (process-buffer proc)
(save-excursion
(goto-char (process-mark proc))
(insert-before-markers string))
(goto-char gds-read-cursor)
(while (let ((form (condition-case nil
(read (current-buffer))
(error nil))))
(if form
(save-excursion
(funcall gds-protocol-handler (car form) (cdr form))))
form)
(setq gds-read-cursor (point)))))
;; Subprocess sentinel: do nothing. (Currently just here to avoid
;; inserting un-`read'able process status messages into the process
;; buffer.)
(defun gds-sentinel (proc event)
)
;;;; The end!
(provide 'gds-server)
;;; gds-server.el ends here.
|
