| 1 | ;;; talk.el --- allow several users to talk to each other through Emacs |
| 2 | |
| 3 | ;; Copyright (C) 1995 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Maintainer: FSF |
| 6 | ;; Keywords: comm, frames |
| 7 | |
| 8 | ;; This file is part of GNU Emacs. |
| 9 | |
| 10 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
| 11 | ;; it under the terms of the GNU General Public License as published by |
| 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
| 13 | ;; any later version. |
| 14 | |
| 15 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | ;; GNU General Public License for more details. |
| 19 | |
| 20 | ;; You should have received a copy of the GNU General Public License |
| 21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
| 22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | ;; Boston, MA 02111-1307, USA. |
| 24 | |
| 25 | ;;; Commentary: |
| 26 | |
| 27 | ;; This is a multi-user talk package that runs in Emacs. |
| 28 | ;; Use talk-connect to bring a new person into the conversation. |
| 29 | |
| 30 | ;;; Code: |
| 31 | |
| 32 | (defvar talk-display-alist nil |
| 33 | "Alist of displays on which Emacs talk is now running. |
| 34 | Each element has the form (DISPLAY FRAME BUFFER).") |
| 35 | |
| 36 | ;;;###autoload |
| 37 | (defun talk-connect (display) |
| 38 | "Connect to display DISPLAY for the Emacs talk group." |
| 39 | (interactive "sTalk to display: ") |
| 40 | ;; Make sure we have an entry for the current display. |
| 41 | (let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))) |
| 42 | (talk-add-display mydisp)) |
| 43 | ;; Make sure we have an entry for the specified display. |
| 44 | (talk-add-display display) |
| 45 | ;; Add the new buffers to all talk frames. |
| 46 | (talk-update-buffers)) |
| 47 | |
| 48 | (defun talk-add-display (display) |
| 49 | (let* ((elt (assoc display talk-display-alist)) |
| 50 | (name (concat "*talk-" display "*")) |
| 51 | buffer frame) |
| 52 | (if (not (and elt (frame-live-p (setq frame (nth 1 elt))))) |
| 53 | (setq frame (make-frame-on-display display (list (cons 'name name))))) |
| 54 | (if (not (and elt (buffer-name (get-buffer (setq buffer (nth 2 elt)))))) |
| 55 | (setq buffer (get-buffer-create name))) |
| 56 | (setq talk-display-alist |
| 57 | (cons (list display frame buffer) (delq elt talk-display-alist))))) |
| 58 | |
| 59 | (defun talk-disconnect () |
| 60 | "Disconnect this display from the Emacs talk group." |
| 61 | (interactive) |
| 62 | (let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))) |
| 63 | (elt (assoc mydisp talk-display-alist))) |
| 64 | (delete-frame (nth 1 elt)) |
| 65 | (kill-buffer (nth 2 elt)) |
| 66 | (setq talk-display-alist (delq elt talk-display-alist)) |
| 67 | (talk-update-buffers))) |
| 68 | |
| 69 | (defun talk-update-buffers () |
| 70 | "Update all the talk frames so that each shows all the talk buffers." |
| 71 | (let ((tail talk-display-alist)) |
| 72 | (while tail |
| 73 | (let ((frame (nth 1 (car tail))) |
| 74 | (this-buffer (nth 2 (car tail))) |
| 75 | (buffers |
| 76 | (mapcar (function (lambda (elt) (nth 2 elt))) |
| 77 | talk-display-alist))) |
| 78 | ;; Put this display's own talk buffer |
| 79 | ;; at the front of the list. |
| 80 | (setq buffers (cons this-buffer (delq this-buffer buffers))) |
| 81 | (talk-split-up-frame frame buffers)) |
| 82 | (setq tail (cdr tail))))) |
| 83 | |
| 84 | (defun talk-split-up-frame (frame buffers) |
| 85 | "Split FRAME into equal-sized windows displaying the buffers in BUFFERS. |
| 86 | Select the first of these windows, displaying the first of the buffers." |
| 87 | (let ((lines-per-buffer (/ (frame-height frame) (length buffers))) |
| 88 | (old-frame (selected-frame))) |
| 89 | (unwind-protect |
| 90 | (progn |
| 91 | (select-frame frame) |
| 92 | (select-window (frame-first-window frame)) |
| 93 | (delete-other-windows) |
| 94 | (while (progn |
| 95 | (switch-to-buffer (car buffers)) |
| 96 | (setq buffers (cdr buffers))) |
| 97 | (split-window-vertically lines-per-buffer) |
| 98 | (other-window 1)) |
| 99 | (select-window (frame-first-window frame))) |
| 100 | (select-frame old-frame)))) |
| 101 | |
| 102 | (provide 'talk) |
| 103 | |
| 104 | ;;; talk.el ends here |