Merge from emacs-23.
[bpt/emacs.git] / lisp / talk.el
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60370d40 1;;; talk.el --- allow several users to talk to each other through Emacs
5abe8993 2
c90f2757 3;; Copyright (C) 1995, 2001, 2002, 2003, 2004, 2005,
5df4f04c 4;; 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
b578f267 5
30764597 6;; Maintainer: FSF
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7;; Keywords: comm, frames
8
9;; This file is part of GNU Emacs.
10
eb3fa2cf 11;; GNU Emacs is free software: you can redistribute it and/or modify
5abe8993 12;; it under the terms of the GNU General Public License as published by
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13;; the Free Software Foundation, either version 3 of the License, or
14;; (at your option) any later version.
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15
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.
20
21;; You should have received a copy of the GNU General Public License
eb3fa2cf 22;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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23
24;;; Commentary:
25
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26;; This is a multi-user talk package that runs in Emacs.
27;; Use talk-connect to bring a new person into the conversation.
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28
29;;; Code:
30
31(defvar talk-display-alist nil
32 "Alist of displays on which Emacs talk is now running.
33Each element has the form (DISPLAY FRAME BUFFER).")
34
35;;;###autoload
36(defun talk-connect (display)
37 "Connect to display DISPLAY for the Emacs talk group."
38 (interactive "sTalk to display: ")
39 ;; Make sure we have an entry for the current display.
40 (let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))))
41 (talk-add-display mydisp))
42 ;; Make sure we have an entry for the specified display.
43 (talk-add-display display)
44 ;; Add the new buffers to all talk frames.
45 (talk-update-buffers))
46
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47;;;###autoload
48(defun talk ()
49 "Connect to the Emacs talk group from the current X display or tty frame."
50 (interactive)
b6660415 51 (let ((type (frame-live-p (selected-frame)))
6ed8eeff 52 (display (frame-terminal (selected-frame))))
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53 (if (or (eq type t) (eq type 'x))
54 (talk-add-display
55 (terminal-name (frame-terminal (selected-frame))))
56 (error "Unknown frame type")))
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57 (talk-update-buffers))
58
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59(defun talk-add-display (display)
60 (let* ((elt (assoc display talk-display-alist))
61 (name (concat "*talk-" display "*"))
62 frame buffer)
b6660415 63 (if (and elt (frame-live-p (nth 1 elt)))
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64 (setq frame (nth 1 elt))
65 (setq frame (make-frame-on-display display (list (cons 'name name)))))
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66 (if (not (and elt (buffer-name (get-buffer (setq buffer (nth 2 elt))))))
67 (setq buffer (get-buffer-create name)))
b6660415 68 (add-to-list 'delete-frame-functions 'talk-handle-delete-frame)
17086732 69 (setq talk-display-alist
b6660415 70 (cons (list display frame buffer) (delq elt talk-display-alist)))))
17086732 71
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72(defun talk-handle-delete-frame (frame)
73 (dolist (d talk-display-alist)
74 (when (eq (nth 1 d) frame)
75 (setq talk-display-alist (delq d talk-display-alist))
76 (talk-update-buffers))))
17086732 77
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78(defun talk-disconnect ()
79 "Disconnect this display from the Emacs talk group."
c2bef985 80 (interactive)
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81 (let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))
82 (elt (assoc mydisp talk-display-alist)))
83 (delete-frame (nth 1 elt))
84 (kill-buffer (nth 2 elt))
85 (setq talk-display-alist (delq elt talk-display-alist))
86 (talk-update-buffers)))
87
88(defun talk-update-buffers ()
89 "Update all the talk frames so that each shows all the talk buffers."
90 (let ((tail talk-display-alist))
91 (while tail
92 (let ((frame (nth 1 (car tail)))
93 (this-buffer (nth 2 (car tail)))
94 (buffers
95 (mapcar (function (lambda (elt) (nth 2 elt)))
96 talk-display-alist)))
97 ;; Put this display's own talk buffer
98 ;; at the front of the list.
99 (setq buffers (cons this-buffer (delq this-buffer buffers)))
100 (talk-split-up-frame frame buffers))
101 (setq tail (cdr tail)))))
102
103(defun talk-split-up-frame (frame buffers)
104 "Split FRAME into equal-sized windows displaying the buffers in BUFFERS.
105Select the first of these windows, displaying the first of the buffers."
106 (let ((lines-per-buffer (/ (frame-height frame) (length buffers)))
107 (old-frame (selected-frame)))
108 (unwind-protect
109 (progn
110 (select-frame frame)
111 (select-window (frame-first-window frame))
112 (delete-other-windows)
113 (while (progn
114 (switch-to-buffer (car buffers))
115 (setq buffers (cdr buffers)))
116 (split-window-vertically lines-per-buffer)
117 (other-window 1))
118 (select-window (frame-first-window frame)))
119 (select-frame old-frame))))
120
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121(provide 'talk)
122
5abe8993 123;;; talk.el ends here