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122 lines
4.2 KiB
EmacsLisp
122 lines
4.2 KiB
EmacsLisp
;;; talk.el --- allow several users to talk to each other through Emacs -*- lexical-binding: t -*-
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;; Copyright (C) 1995, 2001-2021 Free Software Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: comm, frames
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This is a multi-user talk package that runs in Emacs.
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;; Use `talk-connect' to bring a new person into the conversation.
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;;; Code:
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(defvar talk-display-alist nil
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"Alist of displays on which Emacs talk is now running.
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Each element has the form (DISPLAY FRAME BUFFER).")
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;;;###autoload
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(defun talk-connect (display)
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"Connect to display DISPLAY for the Emacs talk group."
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(interactive "sTalk to display: ")
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;; Make sure we have an entry for the current display.
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(let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))))
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(talk-add-display mydisp))
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;; Make sure we have an entry for the specified display.
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(talk-add-display display)
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;; Add the new buffers to all talk frames.
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(talk-update-buffers))
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;;;###autoload
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(defun talk ()
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"Connect to the Emacs talk group from the current X display or tty frame."
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(interactive)
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(let ((type (frame-live-p (selected-frame))))
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(if (or (eq type t) (eq type 'x))
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(talk-add-display
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(terminal-name (frame-terminal)))
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(error "Unknown frame type")))
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(talk-update-buffers))
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(defun talk-add-display (display)
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(let* ((elt (assoc display talk-display-alist))
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(name (concat "*talk-" display "*"))
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frame buffer)
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(if (and elt (frame-live-p (nth 1 elt)))
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(setq frame (nth 1 elt))
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(setq frame (make-frame-on-display display (list (cons 'name name)))))
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(if (not (and elt (buffer-name (get-buffer (setq buffer (nth 2 elt))))))
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(setq buffer (get-buffer-create name)))
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(add-to-list 'delete-frame-functions 'talk-handle-delete-frame)
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(setq talk-display-alist
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(cons (list display frame buffer) (delq elt talk-display-alist)))))
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(defun talk-handle-delete-frame (frame)
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(dolist (d talk-display-alist)
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(when (eq (nth 1 d) frame)
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(setq talk-display-alist (delq d talk-display-alist))
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(talk-update-buffers))))
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(defun talk-disconnect ()
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"Disconnect this display from the Emacs talk group."
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(interactive)
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(let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))
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(elt (assoc mydisp talk-display-alist)))
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(delete-frame (nth 1 elt))
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(kill-buffer (nth 2 elt))
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(setq talk-display-alist (delq elt talk-display-alist))
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(talk-update-buffers)))
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(defun talk-update-buffers ()
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"Update all the talk frames so that each shows all the talk buffers."
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(let ((tail talk-display-alist))
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(while tail
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(let ((frame (nth 1 (car tail)))
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(this-buffer (nth 2 (car tail)))
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(buffers
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(mapcar (lambda (elt) (nth 2 elt))
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talk-display-alist)))
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;; Put this display's own talk buffer
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;; at the front of the list.
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(setq buffers (cons this-buffer (delq this-buffer buffers)))
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(talk-split-up-frame frame buffers))
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(setq tail (cdr tail)))))
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(defun talk-split-up-frame (frame buffers)
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"Split FRAME into equal-sized windows displaying the buffers in BUFFERS.
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Select the first of these windows, displaying the first of the buffers."
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(let ((lines-per-buffer (/ (frame-height frame) (length buffers)))
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(old-frame (selected-frame)))
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(unwind-protect
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(progn
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(select-frame frame)
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(select-window (frame-first-window frame))
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(delete-other-windows)
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(while (progn
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(switch-to-buffer (car buffers))
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(setq buffers (cdr buffers)))
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(split-window-below lines-per-buffer)
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(other-window 1))
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(select-window (frame-first-window frame)))
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(select-frame old-frame))))
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(provide 'talk)
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;;; talk.el ends here
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