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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 |