code.delx.au - gnu-emacs/blob - lisp/talk.el

   1 ;;; talk.el --- Allow several users to talk to each other through Emacs.
   2
   3 ;; Copyright (C) 1995 Free Software Foundation, Inc.
   4 ;; Keywords: comm, frames
   5
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation; either version 2, or (at your option)
  11 ;; any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  20 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 ;;; Commentary:
  23
  24 ;;; This is a multi-user talk package that runs in Emacs.
  25 ;;; Use talk-connect to bring a new person into the conversation.
  26
  27 ;;; Code:
  28
  29 (defvar talk-display-alist nil
  30   "Alist of displays on which Emacs talk is now running.
  31 Each element has the form (DISPLAY FRAME BUFFER).")
  32
  33 ;;;###autoload
  34 (defun talk-connect (display)
  35   "Connect to display DISPLAY for the Emacs talk group."
  36   (interactive "sTalk to display: ")
  37   ;; Make sure we have an entry for the current display.
  38   (let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))))
  39     (talk-add-display mydisp))
  40   ;; Make sure we have an entry for the specified display.
  41   (talk-add-display display)
  42   ;; Add the new buffers to all talk frames.
  43   (talk-update-buffers))
  44
  45 (defun talk-add-display (display)
  46   (or (assoc display talk-display-alist)
  47       (let* ((name (concat "*talk-" display "*"))
  48              (buffer (get-buffer-create name))
  49              (frame (make-frame-on-display display
  50                                            (list (cons 'name name)))))
  51         (setq talk-display-alist
  52               (cons (list display frame buffer)
  53                     talk-display-alist)))))
  54
  55 (defun talk-disconnect ()
  56   "Disconnect this display from the Emacs talk group."
  57   (let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))
  58          (elt (assoc mydisp talk-display-alist)))
  59     (delete-frame (nth 1 elt))
  60     (kill-buffer (nth 2 elt))
  61     (setq talk-display-alist (delq elt talk-display-alist))
  62     (talk-update-buffers)))
  63
  64 (defun talk-update-buffers ()
  65   "Update all the talk frames so that each shows all the talk buffers."
  66   (let ((tail talk-display-alist))
  67     (while tail
  68       (let ((frame (nth 1 (car tail)))
  69             (this-buffer (nth 2 (car tail)))
  70             (buffers
  71              (mapcar (function (lambda (elt) (nth 2 elt)))
  72                      talk-display-alist)))
  73         ;; Put this display's own talk buffer
  74         ;; at the front of the list.
  75         (setq buffers (cons this-buffer (delq this-buffer buffers)))
  76         (talk-split-up-frame frame buffers))
  77       (setq tail (cdr tail)))))
  78
  79 (defun talk-split-up-frame (frame buffers)
  80   "Split FRAME into equal-sized windows displaying the buffers in BUFFERS.
  81 Select the first of these windows, displaying the first of the buffers."
  82   (let ((lines-per-buffer (/ (frame-height frame) (length buffers)))
  83         (old-frame (selected-frame)))
  84     (unwind-protect
  85         (progn
  86           (select-frame frame)
  87           (select-window (frame-first-window frame))
  88           (delete-other-windows)
  89           (while (progn
  90                    (switch-to-buffer (car buffers))
  91                    (setq buffers (cdr buffers)))
  92             (split-window-vertically lines-per-buffer)
  93             (other-window 1))
  94           (select-window (frame-first-window frame)))
  95       (select-frame old-frame))))
  96
  97 ;;; talk.el ends here