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;;; gds-server.el -- infrastructure for running GDS server processes
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;;;; Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free
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;;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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;;;; Customization group setup.
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"Customization options for Guile Emacs frontend."
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;;;; Communication with the (ice-9 gds-server) subprocess.
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;; Subprocess output goes into the `*GDS Process*' buffer, and
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;; is then read from there one form at a time. `gds-read-cursor' is
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;; the buffer position of the start of the next unread form.
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(defvar gds-read-cursor nil)
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;; The guile executable used by the GDS server process.
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(defcustom gds-guile-program "guile"
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"*The guile executable used by the GDS server process."
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(defcustom gds-scheme-directory nil
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"Where GDS's Scheme code is, if not in one of the standard places."
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:type '(choice (const :tag "nil" nil) directory))
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(defun gds-start-server (procname port-or-path protocol-handler &optional bufname)
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"Start a GDS server process called PROCNAME, listening on TCP port
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or Unix domain socket PORT-OR-PATH. PROTOCOL-HANDLER should be a
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function that accepts and processes one protocol form. Optional arg
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BUFNAME specifies the name of the buffer that is used for process
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output; if not specified the buffer name is the same as the process
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(with-current-buffer (get-buffer-create (or bufname procname))
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(let* ((code (format "(begin
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(use-modules (ice-9 gds-server))
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(if gds-scheme-directory
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(concat "(set! %load-path (cons "
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(format "%S" gds-scheme-directory)
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(process-connection-type nil) ; use a pipe
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(proc (start-process procname
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(set (make-local-variable 'gds-read-cursor) (point-min))
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(set (make-local-variable 'gds-protocol-handler) protocol-handler)
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(set-process-filter proc (function gds-filter))
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(set-process-sentinel proc (function gds-sentinel))
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(set-process-coding-system proc 'latin-1-unix)
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(process-kill-without-query proc)
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;; Subprocess output filter: inserts normally into the process buffer,
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;; then tries to reread the output one form at a time and delegates
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;; processing of each form to `gds-protocol-handler'.
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(defun gds-filter (proc string)
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(with-current-buffer (process-buffer proc)
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(goto-char (process-mark proc))
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(insert-before-markers string))
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(goto-char gds-read-cursor)
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(while (let ((form (condition-case nil
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(read (current-buffer))
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(funcall gds-protocol-handler (car form) (cdr form))))
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(setq gds-read-cursor (point)))))
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;; Subprocess sentinel: do nothing. (Currently just here to avoid
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;; inserting un-`read'able process status messages into the process
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(defun gds-sentinel (proc event)
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(provide 'gds-server)
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;;; gds-server.el ends here.
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emacs/gds-server.el
