(defvar talk-display-alist nil
"Alist of displays on which Emacs talk is now running.
Each element has the form (DISPLAY FRAME BUFFER).")
(defun talk-connect (display)
"Connect to display DISPLAY for the Emacs talk group."
(interactive "sTalk to display: ")
(let ((mydisp (cdr (assq 'display (frame-parameters (selected-frame))))))
(talk-add-display mydisp))
(talk-add-display display)
(talk-update-buffers))
(defun talk-add-display (display)
(let* ((elt (assoc display talk-display-alist))
(name (concat "*talk-" display "*"))
buffer frame)
(if (not (and elt (frame-live-p (setq frame (nth 1 elt)))))
(setq frame (make-frame-on-display display (list (cons 'name name)))))
(if (not (and elt (buffer-name (get-buffer (setq buffer (nth 2 elt))))))
(setq buffer (get-buffer-create name)))
(setq talk-display-alist
(cons (list display frame buffer) (delq elt talk-display-alist)))))
(defun talk-disconnect ()
"Disconnect this display from the Emacs talk group."
(interactive)
(let* ((mydisp (cdr (assq 'display (frame-parameters (selected-frame)))))
(elt (assoc mydisp talk-display-alist)))
(delete-frame (nth 1 elt))
(kill-buffer (nth 2 elt))
(setq talk-display-alist (delq elt talk-display-alist))
(talk-update-buffers)))
(defun talk-update-buffers ()
"Update all the talk frames so that each shows all the talk buffers."
(let ((tail talk-display-alist))
(while tail
(let ((frame (nth 1 (car tail)))
(this-buffer (nth 2 (car tail)))
(buffers
(mapcar (function (lambda (elt) (nth 2 elt)))
talk-display-alist)))
(setq buffers (cons this-buffer (delq this-buffer buffers)))
(talk-split-up-frame frame buffers))
(setq tail (cdr tail)))))
(defun talk-split-up-frame (frame buffers)
"Split FRAME into equal-sized windows displaying the buffers in BUFFERS.
Select the first of these windows, displaying the first of the buffers."
(let ((lines-per-buffer (/ (frame-height frame) (length buffers)))
(old-frame (selected-frame)))
(unwind-protect
(progn
(select-frame frame)
(select-window (frame-first-window frame))
(delete-other-windows)
(while (progn
(switch-to-buffer (car buffers))
(setq buffers (cdr buffers)))
(split-window-vertically lines-per-buffer)
(other-window 1))
(select-window (frame-first-window frame)))
(select-frame old-frame))))
(provide 'talk)