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[emacs.git] / lisp / talk.el
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1 ;;; talk.el --- allow several users to talk to each other through Emacs
3 ;; Copyright (C) 1995, 2001, 2002, 2003, 2004, 2005,
4 ;; 2006, 2007 Free Software Foundation, Inc.
6 ;; Maintainer: FSF
7 ;; Keywords: comm, frames
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
26 ;;; Commentary:
28 ;; This is a multi-user talk package that runs in Emacs.
29 ;; Use talk-connect to bring a new person into the conversation.
31 ;;; Code:
33 (defvar talk-display-alist nil
34 "Alist of displays on which Emacs talk is now running.
35 Each element has the form (DISPLAY FRAME BUFFER).")
37 ;;;###autoload
38 (defun talk-connect (display)
39 "Connect to display DISPLAY for the Emacs talk group."
40 (interactive "sTalk to display: ")
41 ;; Make sure we have an entry for the current display.
42 (let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))))
43 (talk-add-display mydisp))
44 ;; Make sure we have an entry for the specified display.
45 (talk-add-display display)
46 ;; Add the new buffers to all talk frames.
47 (talk-update-buffers))
49 (defun talk-add-display (display)
50 (let* ((elt (assoc display talk-display-alist))
51 (name (concat "*talk-" display "*"))
52 buffer frame)
53 (if (not (and elt (frame-live-p (setq frame (nth 1 elt)))))
54 (setq frame (make-frame-on-display display (list (cons 'name name)))))
55 (if (not (and elt (buffer-name (get-buffer (setq buffer (nth 2 elt))))))
56 (setq buffer (get-buffer-create name)))
57 (setq talk-display-alist
58 (cons (list display frame buffer) (delq elt talk-display-alist)))))
60 (defun talk-disconnect ()
61 "Disconnect this display from the Emacs talk group."
62 (interactive)
63 (let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))
64 (elt (assoc mydisp talk-display-alist)))
65 (delete-frame (nth 1 elt))
66 (kill-buffer (nth 2 elt))
67 (setq talk-display-alist (delq elt talk-display-alist))
68 (talk-update-buffers)))
70 (defun talk-update-buffers ()
71 "Update all the talk frames so that each shows all the talk buffers."
72 (let ((tail talk-display-alist))
73 (while tail
74 (let ((frame (nth 1 (car tail)))
75 (this-buffer (nth 2 (car tail)))
76 (buffers
77 (mapcar (function (lambda (elt) (nth 2 elt)))
78 talk-display-alist)))
79 ;; Put this display's own talk buffer
80 ;; at the front of the list.
81 (setq buffers (cons this-buffer (delq this-buffer buffers)))
82 (talk-split-up-frame frame buffers))
83 (setq tail (cdr tail)))))
85 (defun talk-split-up-frame (frame buffers)
86 "Split FRAME into equal-sized windows displaying the buffers in BUFFERS.
87 Select the first of these windows, displaying the first of the buffers."
88 (let ((lines-per-buffer (/ (frame-height frame) (length buffers)))
89 (old-frame (selected-frame)))
90 (unwind-protect
91 (progn
92 (select-frame frame)
93 (select-window (frame-first-window frame))
94 (delete-other-windows)
95 (while (progn
96 (switch-to-buffer (car buffers))
97 (setq buffers (cdr buffers)))
98 (split-window-vertically lines-per-buffer)
99 (other-window 1))
100 (select-window (frame-first-window frame)))
101 (select-frame old-frame))))
103 (provide 'talk)
105 ;;; arch-tag: 7ab0ad88-1788-4886-a44c-ae685e6f8a1a
106 ;;; talk.el ends here