-;;; windows.el --- GNU Emacs window commands aside from those written in C.
+;;; window.el --- GNU Emacs window commands aside from those written in C.
-;; Copyright (C) 1985, 1989 Free Software Foundation, Inc.
+;;; Copyright (C) 1985, 1989, 1992, 1993 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
;; 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 1, or (at your option)
+;; 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,
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;;; Code:
(defun count-windows (&optional minibuf)
"Returns the number of visible windows.
Optional arg NO-MINI non-nil means don't count the minibuffer
even if it is active."
(let ((count 0))
- (walk-windows (function (lambda ()
+ (walk-windows (function (lambda (w)
(setq count (+ count 1))))
minibuf)
count))
(defun balance-windows ()
- "Makes all visible windows the same size (approximately)."
+ "Makes all visible windows the same height (approximately)."
(interactive)
- (let ((count 0))
+ (let ((count -1) levels newsizes size)
+ ;; Find all the different vpos's at which windows start,
+ ;; then count them. But ignore levels that differ by only 1.
+ (save-window-excursion
+ (let (tops (prev-top -2))
+ (walk-windows (function (lambda (w)
+ (setq tops (cons (nth 1 (window-edges w))
+ tops))))
+ 'nomini)
+ (setq tops (sort tops '<))
+ (while tops
+ (if (> (car tops) (1+ prev-top))
+ (setq prev-top (car tops)
+ count (1+ count)))
+ (setq levels (cons (cons (car tops) count) levels))
+ (setq tops (cdr tops)))
+ (setq count (1+ count))))
+ ;; Subdivide the frame into that many vertical levels.
+ (setq size (/ (frame-height) count))
+ (walk-windows (function
+ (lambda (w)
+ (select-window w)
+ (let ((newtop (cdr (assq (nth 1 (window-edges))
+ levels)))
+ (newbot (or (cdr (assq (+ (window-height)
+ (nth 1 (window-edges)))
+ levels))
+ count)))
+ (setq newsizes
+ (cons (cons w (* size (- newbot newtop)))
+ newsizes))))))
(walk-windows (function (lambda (w)
- (setq count (+ count 1))))
- 'nomini)
- (let ((size (/ (screen-height) count)))
- (walk-windows (function (lambda (w)
- (select-window w)
- (enlarge-window (- size (window-height)))))
- 'nomini))))
-
-;;; Many people find the minimal-redisplay window splitting annoying,
-;;; so we make it an option.
-
-(defvar split-window-keep-point nil
- "*If non-nil, split windows so that both windows keep the original
-value of point. This is often more convenient for editing.
-If nil, split windows to minimize redisplay. This is convenient on
-slow terminals, but point may be moved strangely to accommodate the
-redisplay.")
+ (select-window w)
+ (let ((newsize (cdr (assq w newsizes))))
+ (enlarge-window (- newsize
+ (window-height))))))
+ 'nomini)))
+
+;;; I think this should be the default; I think people will prefer it--rms.
+(defvar split-window-keep-point t
+ "*If non-nil, split windows keeps the original point in both children.
+This is often more convenient for editing.
+If nil, adjust point in each of the two windows to minimize redisplay.
+This is convenient on slow terminals, but point can move strangely.")
(defun split-window-vertically (&optional arg)
"Split current window into two windows, one above the other.
(if (< (window-start new-w) old-point)
(progn
(set-window-point new-w old-point)
- (select-window new-w)))))))
+ (select-window new-w)))))
+ new-w))
(defun split-window-horizontally (&optional arg)
"Split current window into two windows side by side.
(interactive "p")
(shrink-window arg t))
-(defun window-config-to-register (name)
- "Save the current window configuration in register REG (a letter).
-It can be later retrieved using \\[M-x register-to-window-config]."
- (interactive "cSave window configuration in register: ")
- (set-register name (current-window-configuration)))
-
-(defun register-to-window-config (name)
- "Restore (make current) the window configuration in register REG (a letter).
-Use with a register previously set with \\[window-config-to-register]."
- (interactive "cRestore window configuration from register: ")
- (set-window-configuration (get-register name)))
-
+(defun shrink-window-if-larger-than-buffer (&optional window)
+ "Shrink the WINDOW to be as small as possible to display its contents.
+Do nothing if the buffer contains more lines than the present window height,
+or if some of the window's contents are scrolled out of view,
+or if the window is the only window of its frame."
+ (interactive)
+ (save-excursion
+ (set-buffer (window-buffer window))
+ (let ((w (selected-window)) ;save-window-excursion can't win
+ (buffer-file-name buffer-file-name)
+ (p (point))
+ (n 0)
+ (ignore-final-newline
+ ;; If buffer ends with a newline, ignore it when counting height
+ ;; unless point is after it.
+ (and (not (eobp))
+ (eq ?\n (char-after (1- (point-max))))))
+ (window-min-height 0)
+ (buffer-read-only nil)
+ (modified (buffer-modified-p))
+ (buffer (current-buffer)))
+ (if (and (< 1 (count-windows))
+ (pos-visible-in-window-p (point-min) window))
+ (unwind-protect
+ (progn
+ (select-window (or window w))
+ (goto-char (point-min))
+ (while (pos-visible-in-window-p
+ (- (point-max)
+ (if ignore-final-newline 1 0)))
+ ;; defeat file locking... don't try this at home, kids!
+ (setq buffer-file-name nil)
+ (insert ?\n) (setq n (1+ n)))
+ (if (> n 0) (shrink-window (1- n))))
+ (delete-region (point-min) (point))
+ (set-buffer-modified-p modified)
+ (goto-char p)
+ (select-window w)
+ ;; Make sure we unbind buffer-read-only
+ ;; with the proper current buffer.
+ (set-buffer buffer))))))
+
(define-key ctl-x-map "2" 'split-window-vertically)
-(define-key ctl-x-map "5" 'split-window-horizontally)
-(define-key ctl-x-map "6" 'window-config-to-register)
-(define-key ctl-x-map "7" 'register-to-window-config)
+(define-key ctl-x-map "3" 'split-window-horizontally)
(define-key ctl-x-map "}" 'enlarge-window-horizontally)
(define-key ctl-x-map "{" 'shrink-window-horizontally)
+(define-key ctl-x-map "-" 'shrink-window-if-larger-than-buffer)
+(define-key ctl-x-map "+" 'balance-windows)
;;; windows.el ends here
HCoop / bpt / emacs.git / blobdiff