--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/gnus/gnus-win.el	Mon Aug 13 08:49:20 2007 +0200
@@ -0,0 +1,550 @@
+;;; gnus-win.el --- window configuration functions for Gnus
+;; Copyright (C) 1996,97 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Keywords: news
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'gnus)
+
+(defgroup gnus-windows nil
+  "Window configuration."
+  :group 'gnus)
+
+(defcustom gnus-use-full-window t
+  "*If non-nil, use the entire Emacs screen."
+  :group 'gnus-windows
+  :type 'boolean)
+
+(defvar gnus-window-configuration nil
+  "Obsolete variable.  See `gnus-buffer-configuration'.")
+
+(defcustom gnus-window-min-width 2
+  "*Minimum width of Gnus buffers."
+  :group 'gnus-windows
+  :type 'integer)
+
+(defcustom gnus-window-min-height 1
+  "*Minimum height of Gnus buffers."
+  :group 'gnus-windows
+  :type 'integer)
+
+(defcustom gnus-always-force-window-configuration nil
+  "*If non-nil, always force the Gnus window configurations."
+  :group 'gnus-windows
+  :type 'boolean)
+
+(defvar gnus-buffer-configuration
+  '((group
+     (vertical 1.0
+	       (group 1.0 point)
+	       (if gnus-carpal '(group-carpal 4))))
+    (summary
+     (vertical 1.0
+	       (summary 1.0 point)
+	       (if gnus-carpal '(summary-carpal 4))))
+    (article
+     (cond 
+      ((and gnus-use-picons 
+	    (eq gnus-picons-display-where 'picons))
+       '(frame 1.0
+	       (vertical 1.0
+			 (summary 0.25 point)
+			 (if gnus-carpal '(summary-carpal 4))
+			 (article 1.0))
+	       (vertical ((height . 5) (width . 15)
+			  (user-position . t)
+			  (left . -1) (top . 1))
+			 (picons 1.0))))
+      (gnus-use-trees
+       '(vertical 1.0
+		  (summary 0.25 point)
+		  (tree 0.25)
+		  (article 1.0)))
+      (t
+       '(vertical 1.0
+		 (summary 0.25 point)
+		 (if gnus-carpal '(summary-carpal 4))
+		 (article 1.0)))))
+    (server
+     (vertical 1.0
+	       (server 1.0 point)
+	       (if gnus-carpal '(server-carpal 2))))
+    (browse
+     (vertical 1.0
+	       (browse 1.0 point)
+	       (if gnus-carpal '(browse-carpal 2))))
+    (message
+     (vertical 1.0
+	       (message 1.0 point)))
+    (pick
+     (vertical 1.0
+	       (article 1.0 point)))
+    (info
+     (vertical 1.0
+	       (info 1.0 point)))
+    (summary-faq
+     (vertical 1.0
+	       (summary 0.25)
+	       (faq 1.0 point)))
+    (edit-article
+     (vertical 1.0
+	       (article 1.0 point)))
+    (edit-form
+     (vertical 1.0
+	       (group 0.5)
+	       (edit-form 1.0 point)))
+    (edit-score
+     (vertical 1.0
+	       (summary 0.25)
+	       (edit-score 1.0 point)))
+    (post
+     (vertical 1.0
+	       (post 1.0 point)))
+    (reply
+     (vertical 1.0
+	       (article-copy 0.5)
+	       (message 1.0 point)))
+    (forward
+     (vertical 1.0
+	       (message 1.0 point)))
+    (reply-yank
+     (vertical 1.0
+	       (message 1.0 point)))
+    (mail-bounce
+     (vertical 1.0
+	       (article 0.5)
+	       (message 1.0 point)))
+    (draft
+     (vertical 1.0
+	       (draft 1.0 point)))
+    (pipe
+     (vertical 1.0
+	       (summary 0.25 point)
+	       (if gnus-carpal '(summary-carpal 4))
+	       ("*Shell Command Output*" 1.0)))
+    (bug
+     (vertical 1.0
+	       ("*Gnus Help Bug*" 0.5)
+	       ("*Gnus Bug*" 1.0 point)))
+    (score-trace
+     (vertical 1.0
+	       (summary 0.5 point)
+	       ("*Score Trace*" 1.0)))
+    (score-words
+     (vertical 1.0
+	       (summary 0.5 point)
+	       ("*Score Words*" 1.0)))
+    (compose-bounce
+     (vertical 1.0
+	       (article 0.5)
+	       (message 1.0 point))))
+  "Window configuration for all possible Gnus buffers.
+See the Gnus manual for an explanation of the syntax used.")
+
+(defvar gnus-window-to-buffer
+  '((group . gnus-group-buffer)
+    (summary . gnus-summary-buffer)
+    (article . gnus-article-buffer)
+    (server . gnus-server-buffer)
+    (browse . "*Gnus Browse Server*")
+    (edit-group . gnus-group-edit-buffer)
+    (edit-form . gnus-edit-form-buffer)
+    (edit-server . gnus-server-edit-buffer)
+    (group-carpal . gnus-carpal-group-buffer)
+    (summary-carpal . gnus-carpal-summary-buffer)
+    (server-carpal . gnus-carpal-server-buffer)
+    (browse-carpal . gnus-carpal-browse-buffer)
+    (edit-score . gnus-score-edit-buffer)
+    (message . gnus-message-buffer)
+    (mail . gnus-message-buffer)
+    (post-news . gnus-message-buffer)
+    (faq . gnus-faq-buffer)
+    (picons . "*Picons*")
+    (tree . gnus-tree-buffer)
+    (info . gnus-info-buffer)
+    (article-copy . gnus-article-copy)
+    (draft . gnus-draft-buffer))
+  "Mapping from short symbols to buffer names or buffer variables.")
+
+;;; Internal variables.
+
+(defvar gnus-current-window-configuration nil
+  "The most recently set window configuration.")
+
+(defvar gnus-created-frames nil)
+
+(defun gnus-kill-gnus-frames ()
+  "Kill all frames Gnus has created."
+  (while gnus-created-frames
+    (when (frame-live-p (car gnus-created-frames))
+      ;; We slap a condition-case around this `delete-frame' to ensure 
+      ;; against errors if we try do delete the single frame that's left.
+      (ignore-errors
+	(delete-frame (car gnus-created-frames))))
+    (pop gnus-created-frames)))
+
+(defun gnus-window-configuration-element (list)
+  (while (and list
+	      (not (assq (car list) gnus-window-configuration)))
+    (pop list))
+  (cadr (assq (car list) gnus-window-configuration)))
+
+(defun gnus-windows-old-to-new (setting)
+  ;; First we take care of the really, really old Gnus 3 actions.
+  (when (symbolp setting)
+    (setq setting
+	  ;; Take care of ooold GNUS 3.x values.
+	  (cond ((eq setting 'SelectArticle) 'article)
+		((memq setting '(SelectNewsgroup SelectSubject ExpandSubject))
+		 'summary)
+		((memq setting '(ExitNewsgroup)) 'group)
+		(t setting))))
+  (if (or (listp setting)
+	  (not (and gnus-window-configuration
+		    (memq setting '(group summary article)))))
+      setting
+    (let* ((elem
+	    (cond 
+	     ((eq setting 'group)
+	      (gnus-window-configuration-element
+	       '(group newsgroups ExitNewsgroup)))
+	     ((eq setting 'summary)
+	      (gnus-window-configuration-element
+	       '(summary SelectNewsgroup SelectSubject ExpandSubject)))
+	     ((eq setting 'article)
+	      (gnus-window-configuration-element
+	       '(article SelectArticle)))))
+	   (total (apply '+ elem))
+	   (types '(group summary article))
+	   (pbuf (if (eq setting 'newsgroups) 'group 'summary))
+	   (i 0)
+	   perc out)
+      (while (< i 3)
+	(or (not (numberp (nth i elem)))
+	    (zerop (nth i elem))
+	    (progn
+	      (setq perc (if (= i 2)
+			     1.0
+			   (/ (float (nth i elem)) total)))
+	      (push (if (eq pbuf (nth i types))
+			(list (nth i types) perc 'point)
+		      (list (nth i types) perc))
+		    out)))
+	(incf i))
+      `(vertical 1.0 ,@(nreverse out)))))
+
+;;;###autoload
+(defun gnus-add-configuration (conf)
+  "Add the window configuration CONF to `gnus-buffer-configuration'."
+  (setq gnus-buffer-configuration
+	(cons conf (delq (assq (car conf) gnus-buffer-configuration)
+			 gnus-buffer-configuration))))
+
+(defvar gnus-frame-list nil)
+
+(defun gnus-configure-frame (split &optional window)
+  "Split WINDOW according to SPLIT."
+  (unless window
+    (setq window (get-buffer-window (current-buffer))))
+  (select-window window)
+  ;; This might be an old-stylee buffer config.
+  (when (vectorp split)
+    (setq split (append split nil)))
+  (when (or (consp (car split))
+	    (vectorp (car split)))
+    (push 1.0 split)
+    (push 'vertical split))
+  ;; The SPLIT might be something that is to be evaled to
+  ;; return a new SPLIT.
+  (while (and (not (assq (car split) gnus-window-to-buffer))
+	      (gnus-functionp (car split)))
+    (setq split (eval split)))
+  (let* ((type (car split))
+	 (subs (cddr split))
+	 (len (if (eq type 'horizontal) (window-width) (window-height)))
+	 (total 0)
+	 (window-min-width (or gnus-window-min-width window-min-width))
+	 (window-min-height (or gnus-window-min-height window-min-height))
+	 s result new-win rest comp-subs size sub)
+    (cond
+     ;; Nothing to do here.
+     ((null split))
+     ;; Don't switch buffers.
+     ((null type)
+      (and (memq 'point split) window))
+     ;; This is a buffer to be selected.
+     ((not (memq type '(frame horizontal vertical)))
+      (let ((buffer (cond ((stringp type) type)
+			  (t (cdr (assq type gnus-window-to-buffer)))))
+	    buf)
+	(unless buffer
+	  (error "Illegal buffer type: %s" type))
+	(unless (setq buf (get-buffer (if (symbolp buffer)
+					  (symbol-value buffer) buffer)))
+	  (setq buf (get-buffer-create (if (symbolp buffer)
+					   (symbol-value buffer) buffer))))
+	(switch-to-buffer buf)
+	;; We return the window if it has the `point' spec.
+	(and (memq 'point split) window)))
+     ;; This is a frame split.
+     ((eq type 'frame)
+      (unless gnus-frame-list
+	(setq gnus-frame-list (list (window-frame
+				     (get-buffer-window (current-buffer))))))
+      (let ((i 0)
+	    params frame fresult)
+	(while (< i (length subs))
+	  ;; Frame parameter is gotten from the sub-split.
+	  (setq params (cadr (elt subs i)))
+	  ;; It should be a list.
+	  (unless (listp params)
+	    (setq params nil))
+	  ;; Create a new frame?
+	  (unless (setq frame (elt gnus-frame-list i))
+	    (nconc gnus-frame-list (list (setq frame (make-frame params))))
+	    (push frame gnus-created-frames))
+	  ;; Is the old frame still alive?
+	  (unless (frame-live-p frame)
+	    (setcar (nthcdr i gnus-frame-list)
+		    (setq frame (make-frame params))))
+	  ;; Select the frame in question and do more splits there.
+	  (select-frame frame)
+	  (setq fresult (or (gnus-configure-frame (elt subs i)) fresult))
+	  (incf i))
+	;; Select the frame that has the selected buffer.
+	(when fresult
+	  (select-frame (window-frame fresult)))))
+     ;; This is a normal split.
+     (t
+      (when (> (length subs) 0)
+	;; First we have to compute the sizes of all new windows.
+	(while subs
+	  (setq sub (append (pop subs) nil))
+	  (while (and (not (assq (car sub) gnus-window-to-buffer))
+		      (gnus-functionp (car sub)))
+	    (setq sub (eval sub)))
+	  (when sub
+	    (push sub comp-subs)
+	    (setq size (cadar comp-subs))
+	    (cond ((equal size 1.0)
+		   (setq rest (car comp-subs))
+		   (setq s 0))
+		  ((floatp size)
+		   (setq s (floor (* size len))))
+		  ((integerp size)
+		   (setq s size))
+		  (t
+		   (error "Illegal size: %s" size)))
+	    ;; Try to make sure that we are inside the safe limits.
+	    (cond ((zerop s))
+		  ((eq type 'horizontal)
+		   (setq s (max s window-min-width)))
+		  ((eq type 'vertical)
+		   (setq s (max s window-min-height))))
+	    (setcar (cdar comp-subs) s)
+	    (incf total s)))
+	;; Take care of the "1.0" spec.
+	(if rest
+	    (setcar (cdr rest) (- len total))
+	  (error "No 1.0 specs in %s" split))
+	;; The we do the actual splitting in a nice recursive
+	;; fashion.
+	(setq comp-subs (nreverse comp-subs))
+	(while comp-subs
+	  (if (null (cdr comp-subs))
+	      (setq new-win window)
+	    (setq new-win
+		  (split-window window (cadar comp-subs)
+				(eq type 'horizontal))))
+	  (setq result (or (gnus-configure-frame
+			    (car comp-subs) window)
+			   result))
+	  (select-window new-win)
+	  (setq window new-win)
+	  (setq comp-subs (cdr comp-subs))))
+      ;; Return the proper window, if any.
+      (when result
+	(select-window result))))))
+
+(defvar gnus-frame-split-p nil)
+
+(defun gnus-configure-windows (setting &optional force)
+  (setq gnus-current-window-configuration setting)
+  (setq force (or force gnus-always-force-window-configuration))
+  (setq setting (gnus-windows-old-to-new setting))
+  (let ((split (if (symbolp setting)
+		   (cadr (assq setting gnus-buffer-configuration))
+		 setting))
+	all-visible)
+
+    (setq gnus-frame-split-p nil)
+
+    (unless split
+      (error "No such setting: %s" setting))
+
+    (if (and (setq all-visible (gnus-all-windows-visible-p split))
+	     (not force))
+	;; All the windows mentioned are already visible, so we just
+	;; put point in the assigned buffer, and do not touch the
+	;; winconf.
+	(select-window all-visible)
+
+      ;; Either remove all windows or just remove all Gnus windows.
+      (let ((frame (selected-frame)))
+	(unwind-protect
+	    (if gnus-use-full-window
+		;; We want to remove all other windows.
+		(if (not gnus-frame-split-p)
+		    ;; This is not a `frame' split, so we ignore the
+		    ;; other frames.  
+		    (delete-other-windows)
+		  ;; This is a `frame' split, so we delete all windows
+		  ;; on all frames.
+		  (gnus-delete-windows-in-gnusey-frames))
+	      ;; Just remove some windows.
+	      (gnus-remove-some-windows)
+	      (switch-to-buffer nntp-server-buffer))
+	  (select-frame frame)))
+
+      (switch-to-buffer nntp-server-buffer)
+      (gnus-configure-frame split (get-buffer-window (current-buffer))))))
+
+(defun gnus-delete-windows-in-gnusey-frames ()
+  "Do a `delete-other-windows' in all frames that have Gnus windows."
+  (let ((buffers
+	 (mapcar
+	  (lambda (elem)
+	    (if (symbolp (cdr elem))
+		(when (and (boundp (cdr elem))
+			   (symbol-value (cdr elem)))
+		  (get-buffer (symbol-value (cdr elem))))
+	      (when (cdr elem) 
+		(get-buffer (cdr elem)))))
+	  gnus-window-to-buffer)))
+    (mapcar 
+     (lambda (frame)
+       (unless (eq (cdr (assq 'minibuffer
+			      (frame-parameters frame)))
+		   'only)
+	 (select-frame frame)
+	 (let (do-delete)
+	   (walk-windows
+	    (lambda (window)
+	      (when (memq (window-buffer window) buffers)
+		(setq do-delete t))))
+	   (when do-delete
+	     (delete-other-windows)))))
+     (frame-list))))
+
+(defun gnus-all-windows-visible-p (split)
+  "Say whether all buffers in SPLIT are currently visible.
+In particular, the value returned will be the window that
+should have point."
+  (let ((stack (list split))
+	(all-visible t)
+	type buffer win buf)
+    (while (and (setq split (pop stack))
+		all-visible)
+      ;; Be backwards compatible.
+      (when (vectorp split)
+	(setq split (append split nil)))
+      (when (or (consp (car split))
+		(vectorp (car split)))
+	(push 1.0 split)
+	(push 'vertical split))
+      ;; The SPLIT might be something that is to be evaled to
+      ;; return a new SPLIT.
+      (while (and (not (assq (car split) gnus-window-to-buffer))
+		  (gnus-functionp (car split)))
+	(setq split (eval split)))
+
+      (setq type (elt split 0))
+      (cond
+       ;; Nothing here.
+       ((null split) t)
+       ;; A buffer.
+       ((not (memq type '(horizontal vertical frame)))
+	(setq buffer (cond ((stringp type) type)
+			   (t (cdr (assq type gnus-window-to-buffer)))))
+	(unless buffer
+	  (error "Illegal buffer type: %s" type))
+	(when (setq buf (get-buffer (if (symbolp buffer)
+					(symbol-value buffer)
+				      buffer)))
+	  (setq win (get-buffer-window buf t)))
+	(if win
+	    (when (memq 'point split)
+	      (setq all-visible win))
+	  (setq all-visible nil)))
+       (t
+	(when (eq type 'frame)
+	  (setq gnus-frame-split-p t))
+	(setq stack (append (cddr split) stack)))))
+    (unless (eq all-visible t)
+      all-visible)))
+
+(defun gnus-window-top-edge (&optional window)
+  (nth 1 (window-edges window)))
+
+(defun gnus-remove-some-windows ()
+  (let ((buffers gnus-window-to-buffer)
+	buf bufs lowest-buf lowest)
+    (save-excursion
+      ;; Remove windows on all known Gnus buffers.
+      (while buffers
+	(setq buf (cdar buffers))
+	(when (symbolp buf)
+	  (setq buf (and (boundp buf) (symbol-value buf))))
+	(and buf
+	     (get-buffer-window buf)
+	     (progn
+	       (push buf bufs)
+	       (pop-to-buffer buf)
+	       (when (or (not lowest)
+			 (< (gnus-window-top-edge) lowest))
+		 (setq lowest (gnus-window-top-edge))
+		 (setq lowest-buf buf))))
+	(setq buffers (cdr buffers)))
+      ;; Remove windows on *all* summary buffers.
+      (walk-windows
+       (lambda (win)
+	 (let ((buf (window-buffer win)))
+	   (when (string-match	"^\\*Summary" (buffer-name buf))
+	     (push buf bufs)
+	     (pop-to-buffer buf)
+	     (when (or (not lowest)
+		       (< (gnus-window-top-edge) lowest))
+	       (setq lowest-buf buf)
+	       (setq lowest (gnus-window-top-edge)))))))
+      (when lowest-buf
+	(pop-to-buffer lowest-buf)
+	(switch-to-buffer nntp-server-buffer))
+      (while bufs
+	(when (not (eq (car bufs) lowest-buf))
+	  (delete-windows-on (car bufs)))
+	(setq bufs (cdr bufs))))))
+
+(provide 'gnus-win)
+
+;;; gnus-win.el ends here