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118 lines
4.1 KiB
EmacsLisp
118 lines
4.1 KiB
EmacsLisp
;;; windows.el --- GNU Emacs window commands aside from those written in C.
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;;; Copyright (C) 1985, 1989, 1992 Free Software Foundation, Inc.
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;; Maintainer: FSF
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Code:
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(defun count-windows (&optional minibuf)
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"Returns the number of visible windows.
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Optional arg NO-MINI non-nil means don't count the minibuffer
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even if it is active."
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(let ((count 0))
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(walk-windows (function (lambda ()
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(setq count (+ count 1))))
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minibuf)
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count))
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(defun balance-windows ()
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"Makes all visible windows the same size (approximately)."
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(interactive)
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(let ((count 0))
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(walk-windows (function (lambda (w)
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(setq count (+ count 1))))
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'nomini)
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(let ((size (/ (frame-height) count)))
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(walk-windows (function (lambda (w)
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(select-window w)
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(enlarge-window (- size (window-height)))))
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'nomini))))
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;;; I think this should be the default; I think people will prefer it--rms.
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(defvar split-window-keep-point t
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"*If non-nil, split windows so that both windows keep the original
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value of point. This is often more convenient for editing.
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If nil, split windows to minimize redisplay. This is convenient on
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slow terminals, but point may be moved strangely to accommodate the
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redisplay.")
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(defun split-window-vertically (&optional arg)
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"Split current window into two windows, one above the other.
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The uppermost window gets ARG lines and the other gets the rest.
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With no argument, split equally or close to it.
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Both windows display the same buffer now current.
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If the variable split-window-keep-point is non-nil, both new windows
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will get the same value of point as the current window. This is often
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more convenient for editing.
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Otherwise, we chose window starts so as to minimize the amount of
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redisplay; this is convenient on slow terminals. The new selected
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window is the one that the current value of point appears in. The
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value of point can change if the text around point is hidden by the
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new mode line."
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(interactive "P")
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(let ((old-w (selected-window))
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(old-point (point))
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new-w bottom switch)
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(setq new-w (split-window nil (and arg (prefix-numeric-value arg))))
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(or split-window-keep-point
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(progn
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(save-excursion
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(set-buffer (window-buffer))
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(goto-char (window-start))
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(vertical-motion (window-height))
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(set-window-start new-w (point))
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(if (> (point) (window-point new-w))
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(set-window-point new-w (point)))
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(vertical-motion -1)
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(setq bottom (point)))
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(if (<= bottom (point))
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(set-window-point old-w (1- bottom)))
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(if (< (window-start new-w) old-point)
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(progn
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(set-window-point new-w old-point)
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(select-window new-w)))))))
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(defun split-window-horizontally (&optional arg)
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"Split current window into two windows side by side.
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This window becomes the leftmost of the two, and gets
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ARG columns. No arg means split equally."
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(interactive "P")
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(split-window nil (and arg (prefix-numeric-value arg)) t))
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(defun enlarge-window-horizontally (arg)
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"Make current window ARG columns wider."
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(interactive "p")
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(enlarge-window arg t))
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(defun shrink-window-horizontally (arg)
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"Make current window ARG columns narrower."
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(interactive "p")
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(shrink-window arg t))
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(define-key ctl-x-map "2" 'split-window-vertically)
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(define-key ctl-x-map "3" 'split-window-horizontally)
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(define-key ctl-x-map "}" 'enlarge-window-horizontally)
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(define-key ctl-x-map "{" 'shrink-window-horizontally)
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;;; windows.el ends here
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