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1644 lines
66 KiB
EmacsLisp
1644 lines
66 KiB
EmacsLisp
;;; window.el --- GNU Emacs window commands aside from those written in C
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;; Copyright (C) 1985, 1989, 1992, 1993, 1994, 2000, 2001, 2002,
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;; 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: internal
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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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Window tree functions.
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;;; Code:
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(eval-when-compile (require 'cl))
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(defvar window-size-fixed nil
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"*Non-nil in a buffer means windows displaying the buffer are fixed-size.
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If the value is `height', then only the window's height is fixed.
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If the value is `width', then only the window's width is fixed.
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Any other non-nil value fixes both the width and the height.
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Emacs won't change the size of any window displaying that buffer,
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unless you explicitly change the size, or Emacs has no other choice.")
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(make-variable-buffer-local 'window-size-fixed)
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(defmacro save-selected-window (&rest body)
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"Execute BODY, then select the window that was selected before BODY.
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The value returned is the value of the last form in BODY.
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This macro saves and restores the current buffer, since otherwise
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its normal operation could potentially make a different
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buffer current. It does not alter the buffer list ordering.
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This macro saves and restores the selected window, as well as
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the selected window in each frame. If the previously selected
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window of some frame is no longer live at the end of BODY, that
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frame's selected window is left alone. If the selected window is
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no longer live, then whatever window is selected at the end of
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BODY remains selected."
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`(let ((save-selected-window-window (selected-window))
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;; It is necessary to save all of these, because calling
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;; select-window changes frame-selected-window for whatever
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;; frame that window is in.
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(save-selected-window-alist
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(mapcar (lambda (frame) (cons frame (frame-selected-window frame)))
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(frame-list))))
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(save-current-buffer
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(unwind-protect
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(progn ,@body)
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(dolist (elt save-selected-window-alist)
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(and (frame-live-p (car elt))
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(window-live-p (cdr elt))
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(set-frame-selected-window (car elt) (cdr elt))))
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(if (window-live-p save-selected-window-window)
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(select-window save-selected-window-window))))))
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(defun window-body-height (&optional window)
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"Return number of lines in window WINDOW for actual buffer text.
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This does not include the mode line (if any) or the header line (if any)."
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(or window (setq window (selected-window)))
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(if (window-minibuffer-p window)
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(window-height window)
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(with-current-buffer (window-buffer window)
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(max 1 (- (window-height window)
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(if mode-line-format 1 0)
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(if header-line-format 1 0))))))
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(defun one-window-p (&optional nomini all-frames)
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"Return non-nil if the selected window is the only window.
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Optional arg NOMINI non-nil means don't count the minibuffer
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even if it is active. Otherwise, the minibuffer is counted
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when it is active.
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The optional arg ALL-FRAMES t means count windows on all frames.
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If it is `visible', count windows on all visible frames.
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ALL-FRAMES nil or omitted means count only the selected frame,
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plus the minibuffer it uses (which may be on another frame).
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ALL-FRAMES 0 means count all windows in all visible or iconified frames.
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If ALL-FRAMES is anything else, count only the selected frame."
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(let ((base-window (selected-window)))
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(if (and nomini (eq base-window (minibuffer-window)))
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(setq base-window (next-window base-window)))
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(eq base-window
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(next-window base-window (if nomini 'arg) all-frames))))
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(defun window-current-scroll-bars (&optional window)
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"Return the current scroll-bar settings in window WINDOW.
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Value is a cons (VERTICAL . HORIZONTAL) where VERTICAL specifies the
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current location of the vertical scroll-bars (left, right, or nil),
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and HORIZONTAL specifies the current location of the horizontal scroll
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bars (top, bottom, or nil)."
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(let ((vert (nth 2 (window-scroll-bars window)))
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(hor nil))
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(when (or (eq vert t) (eq hor t))
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(let ((fcsb (frame-current-scroll-bars
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(window-frame (or window (selected-window))))))
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(if (eq vert t)
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(setq vert (car fcsb)))
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(if (eq hor t)
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(setq hor (cdr fcsb)))))
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(cons vert hor)))
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(defun walk-windows (proc &optional minibuf all-frames)
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"Cycle through all visible windows, calling PROC for each one.
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PROC is called with a window as argument.
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Optional second arg MINIBUF t means count the minibuffer window even
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if not active. MINIBUF nil or omitted means count the minibuffer only if
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it is active. MINIBUF neither t nor nil means not to count the
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minibuffer even if it is active.
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Several frames may share a single minibuffer; if the minibuffer
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counts, all windows on all frames that share that minibuffer count
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too. Therefore, if you are using a separate minibuffer frame
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and the minibuffer is active and MINIBUF says it counts,
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`walk-windows' includes the windows in the frame from which you
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entered the minibuffer, as well as the minibuffer window.
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ALL-FRAMES is the optional third argument.
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ALL-FRAMES nil or omitted means cycle within the frames as specified above.
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ALL-FRAMES = `visible' means include windows on all visible frames.
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ALL-FRAMES = 0 means include windows on all visible and iconified frames.
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ALL-FRAMES = t means include windows on all frames including invisible frames.
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If ALL-FRAMES is a frame, it means include windows on that frame.
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Anything else means restrict to the selected frame."
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;; If we start from the minibuffer window, don't fail to come back to it.
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(if (window-minibuffer-p (selected-window))
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(setq minibuf t))
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(save-selected-window
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(if (framep all-frames)
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(select-window (frame-first-window all-frames)))
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(let* (walk-windows-already-seen
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(walk-windows-current (selected-window)))
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(while (progn
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(setq walk-windows-current
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(next-window walk-windows-current minibuf all-frames))
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(not (memq walk-windows-current walk-windows-already-seen)))
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(setq walk-windows-already-seen
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(cons walk-windows-current walk-windows-already-seen))
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(funcall proc walk-windows-current)))))
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(defun get-window-with-predicate (predicate &optional minibuf
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all-frames default)
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"Return a window satisfying PREDICATE.
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This function cycles through all visible windows using `walk-windows',
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calling PREDICATE on each one. PREDICATE is called with a window as
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argument. The first window for which PREDICATE returns a non-nil
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value is returned. If no window satisfies PREDICATE, DEFAULT is
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returned.
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Optional second arg MINIBUF t means count the minibuffer window even
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if not active. MINIBUF nil or omitted means count the minibuffer only if
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it is active. MINIBUF neither t nor nil means not to count the
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minibuffer even if it is active.
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Several frames may share a single minibuffer; if the minibuffer
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counts, all windows on all frames that share that minibuffer count
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too. Therefore, if you are using a separate minibuffer frame
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and the minibuffer is active and MINIBUF says it counts,
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`walk-windows' includes the windows in the frame from which you
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entered the minibuffer, as well as the minibuffer window.
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ALL-FRAMES is the optional third argument.
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ALL-FRAMES nil or omitted means cycle within the frames as specified above.
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ALL-FRAMES = `visible' means include windows on all visible frames.
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ALL-FRAMES = 0 means include windows on all visible and iconified frames.
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ALL-FRAMES = t means include windows on all frames including invisible frames.
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If ALL-FRAMES is a frame, it means include windows on that frame.
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Anything else means restrict to the selected frame."
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(catch 'found
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(walk-windows #'(lambda (window)
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(when (funcall predicate window)
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(throw 'found window)))
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minibuf all-frames)
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default))
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(defalias 'some-window 'get-window-with-predicate)
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;; This should probably be written in C (i.e., without using `walk-windows').
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(defun get-buffer-window-list (buffer &optional minibuf all-frames)
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"Return list of all windows displaying BUFFER, or nil if none.
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BUFFER can be a buffer or a buffer name.
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See `walk-windows' for the meaning of MINIBUF and ALL-FRAMES."
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(let ((buffer (if (bufferp buffer) buffer (get-buffer buffer))) windows)
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(walk-windows (function (lambda (window)
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(if (eq (window-buffer window) buffer)
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(setq windows (cons window windows)))))
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minibuf all-frames)
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windows))
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(defun minibuffer-window-active-p (window)
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"Return t if WINDOW (a minibuffer window) is now active."
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(eq window (active-minibuffer-window)))
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(defun count-windows (&optional minibuf)
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"Return the number of visible windows.
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This counts the windows in the selected frame and (if the minibuffer is
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to be counted) its minibuffer frame (if that's not the same frame).
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The optional arg MINIBUF non-nil means count the minibuffer
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even if it is inactive."
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(let ((count 0))
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(walk-windows (lambda (w) (setq count (+ count 1)))
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minibuf)
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count))
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(defun window-safely-shrinkable-p (&optional window)
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"Non-nil if the WINDOW can be shrunk without shrinking other windows.
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If WINDOW is nil or omitted, it defaults to the currently selected window."
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(with-selected-window (or window (selected-window))
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(let ((edges (window-edges)))
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(or (= (nth 2 edges) (nth 2 (window-edges (previous-window))))
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(= (nth 0 edges) (nth 0 (window-edges (next-window))))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; `balance-windows' subroutines using `window-tree'
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;;; Translate from internal window tree format
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(defun bw-get-tree (&optional window-or-frame)
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"Get a window split tree in our format.
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WINDOW-OR-FRAME must be nil, a frame, or a window. If it is nil,
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then the whole window split tree for `selected-frame' is returned.
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If it is a frame, then this is used instead. If it is a window,
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then the smallest tree containing that window is returned."
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(when window-or-frame
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(unless (or (framep window-or-frame)
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(windowp window-or-frame))
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(error "Not a frame or window: %s" window-or-frame)))
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(let ((subtree (bw-find-tree-sub window-or-frame)))
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(when subtree
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(if (integerp subtree)
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nil
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(bw-get-tree-1 subtree)))))
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(defun bw-get-tree-1 (split)
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(if (windowp split)
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split
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(let ((dir (car split))
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(edges (car (cdr split)))
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(childs (cdr (cdr split))))
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(list
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(cons 'dir (if dir 'ver 'hor))
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(cons 'b (nth 3 edges))
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(cons 'r (nth 2 edges))
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(cons 't (nth 1 edges))
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(cons 'l (nth 0 edges))
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(cons 'childs (mapcar #'bw-get-tree-1 childs))))))
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(defun bw-find-tree-sub (window-or-frame &optional get-parent)
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(let* ((window (when (windowp window-or-frame) window-or-frame))
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(frame (when (windowp window) (window-frame window)))
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(wt (car (window-tree frame))))
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(when (< 1 (length (window-list frame 0)))
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(if window
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(bw-find-tree-sub-1 wt window get-parent)
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wt))))
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(defun bw-find-tree-sub-1 (tree win &optional get-parent)
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(unless (windowp win) (error "Not a window: %s" win))
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(if (memq win tree)
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(if get-parent
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get-parent
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tree)
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(let ((childs (cdr (cdr tree)))
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child
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subtree)
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(while (and childs (not subtree))
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(setq child (car childs))
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(setq childs (cdr childs))
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(when (and child (listp child))
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(setq subtree (bw-find-tree-sub-1 child win get-parent))))
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(if (integerp subtree)
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(progn
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(if (= 1 subtree)
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tree
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(1- subtree)))
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subtree
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))))
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;;; Window or object edges
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(defun bw-l (obj)
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"Left edge of OBJ."
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(if (windowp obj) (nth 0 (window-edges obj)) (cdr (assq 'l obj))))
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(defun bw-t (obj)
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"Top edge of OBJ."
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(if (windowp obj) (nth 1 (window-edges obj)) (cdr (assq 't obj))))
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(defun bw-r (obj)
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"Right edge of OBJ."
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(if (windowp obj) (nth 2 (window-edges obj)) (cdr (assq 'r obj))))
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(defun bw-b (obj)
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"Bottom edge of OBJ."
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(if (windowp obj) (nth 3 (window-edges obj)) (cdr (assq 'b obj))))
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;;; Split directions
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(defun bw-dir (obj)
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"Return window split tree direction if OBJ.
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If OBJ is a window return 'both. If it is a window split tree
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then return its direction."
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(if (symbolp obj)
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obj
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(if (windowp obj)
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'both
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(let ((dir (cdr (assq 'dir obj))))
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(unless (memq dir '(hor ver both))
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(error "Can't find dir in %s" obj))
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dir))))
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(defun bw-eqdir (obj1 obj2)
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"Return t if window split tree directions are equal.
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OBJ1 and OBJ2 should be either windows or window split trees in
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our format. The directions returned by `bw-dir' are compared and
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t is returned if they are `eq' or one of them is 'both."
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(let ((dir1 (bw-dir obj1))
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(dir2 (bw-dir obj2)))
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(or (eq dir1 dir2)
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(eq dir1 'both)
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(eq dir2 'both))))
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;;; Building split tree
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(defun bw-refresh-edges (obj)
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"Refresh the edge information of OBJ and return OBJ."
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(unless (windowp obj)
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(let ((childs (cdr (assq 'childs obj)))
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(ol 1000)
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(ot 1000)
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(or -1)
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(ob -1))
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(dolist (o childs)
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(when (> ol (bw-l o)) (setq ol (bw-l o)))
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(when (> ot (bw-t o)) (setq ot (bw-t o)))
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(when (< or (bw-r o)) (setq or (bw-r o)))
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(when (< ob (bw-b o)) (setq ob (bw-b o))))
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(setq obj (delq 'l obj))
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(setq obj (delq 't obj))
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(setq obj (delq 'r obj))
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(setq obj (delq 'b obj))
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(add-to-list 'obj (cons 'l ol))
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(add-to-list 'obj (cons 't ot))
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(add-to-list 'obj (cons 'r or))
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(add-to-list 'obj (cons 'b ob))
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))
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obj)
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;;; Balance windows
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(defun balance-windows (&optional window-or-frame)
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"Make windows the same heights or widths in window split subtrees.
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When called non-interactively WINDOW-OR-FRAME may be either a
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window or a frame. It then balances the windows on the implied
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frame. If the parameter is a window only the corresponding window
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subtree is balanced."
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(interactive)
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(let (
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(wt (bw-get-tree window-or-frame))
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(w)
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(h)
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(tried-sizes)
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(last-sizes)
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(windows (window-list nil 0)))
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(when wt
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(while (not (member last-sizes tried-sizes))
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(when last-sizes (setq tried-sizes (cons last-sizes tried-sizes)))
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(setq last-sizes (mapcar (lambda (w)
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(window-edges w))
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windows))
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(when (eq 'hor (bw-dir wt))
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(setq w (- (bw-r wt) (bw-l wt))))
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(when (eq 'ver (bw-dir wt))
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(setq h (- (bw-b wt) (bw-t wt))))
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(bw-balance-sub wt w h)))))
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(defun bw-adjust-window (window delta horizontal)
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"Wrapper around `adjust-window-trailing-edge' with error checking.
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Arguments WINDOW, DELTA and HORIZONTAL are passed on to that function."
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;; `adjust-window-trailing-edge' may fail if delta is too large.
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(while (>= (abs delta) 1)
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(condition-case err
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(progn
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(adjust-window-trailing-edge window delta horizontal)
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(setq delta 0))
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(error
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;;(message "adjust: %s" (error-message-string err))
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(setq delta (/ delta 2))))))
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(defun bw-balance-sub (wt w h)
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(setq wt (bw-refresh-edges wt))
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(unless w (setq w (- (bw-r wt) (bw-l wt))))
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(unless h (setq h (- (bw-b wt) (bw-t wt))))
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(if (windowp wt)
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(progn
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(when w
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(let ((dw (- w (- (bw-r wt) (bw-l wt)))))
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(when (/= 0 dw)
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(bw-adjust-window wt dw t))))
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(when h
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(let ((dh (- h (- (bw-b wt) (bw-t wt)))))
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(when (/= 0 dh)
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(bw-adjust-window wt dh nil)))))
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(let* ((childs (cdr (assq 'childs wt)))
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(cw (when w (/ w (if (bw-eqdir 'hor wt) (length childs) 1))))
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(ch (when h (/ h (if (bw-eqdir 'ver wt) (length childs) 1)))))
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(dolist (c childs)
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(bw-balance-sub c cw ch)))))
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;;; A different solution to balance-windows
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(defun window-fixed-size-p (&optional window direction)
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"Non-nil if WINDOW cannot be resized in DIRECTION.
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DIRECTION can be nil (i.e. any), `height' or `width'."
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(with-current-buffer (window-buffer window)
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(let ((fixed (and (boundp 'window-size-fixed) window-size-fixed)))
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(when fixed
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(not (and direction
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(member (cons direction window-size-fixed)
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'((height . width) (width . height)))))))))
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(defvar window-area-factor 1
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"Factor by which the window area should be over-estimated.
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This is used by `balance-windows-area'.
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||
Changing this globally has no effect.")
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(make-variable-buffer-local 'window-area-factor)
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(defun balance-windows-area ()
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"Make all visible windows the same area (approximately).
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||
See also `window-area-factor' to change the relative size of specific buffers."
|
||
(interactive)
|
||
(let* ((unchanged 0) (carry 0) (round 0)
|
||
;; Remove fixed-size windows.
|
||
(wins (delq nil (mapcar (lambda (win)
|
||
(if (not (window-fixed-size-p win)) win))
|
||
(window-list nil 'nomini))))
|
||
(changelog nil)
|
||
next)
|
||
;; Resizing a window changes the size of surrounding windows in complex
|
||
;; ways, so it's difficult to balance them all. The introduction of
|
||
;; `adjust-window-trailing-edge' made it a bit easier, but it is still
|
||
;; very difficult to do. `balance-window' above takes an off-line
|
||
;; approach: get the whole window tree, then balance it, then try to
|
||
;; adjust the windows so they fit the result.
|
||
;; Here, instead, we take a "local optimization" approach, where we just
|
||
;; go through all the windows several times until nothing needs to be
|
||
;; changed. The main problem with this approach is that it's difficult
|
||
;; to make sure it terminates, so we use some heuristic to try and break
|
||
;; off infinite loops.
|
||
;; After a round without any change, we allow a second, to give a chance
|
||
;; to the carry to propagate a minor imbalance from the end back to
|
||
;; the beginning.
|
||
(while (< unchanged 2)
|
||
;; (message "New round")
|
||
(setq unchanged (1+ unchanged) round (1+ round))
|
||
(dolist (win wins)
|
||
(setq next win)
|
||
(while (progn (setq next (next-window next))
|
||
(window-fixed-size-p next)))
|
||
;; (assert (eq next (or (cadr (member win wins)) (car wins))))
|
||
(let* ((horiz
|
||
(< (car (window-edges win)) (car (window-edges next))))
|
||
(areadiff (/ (- (* (window-height next) (window-width next)
|
||
(buffer-local-value 'window-area-factor
|
||
(window-buffer next)))
|
||
(* (window-height win) (window-width win)
|
||
(buffer-local-value 'window-area-factor
|
||
(window-buffer win))))
|
||
(max (buffer-local-value 'window-area-factor
|
||
(window-buffer win))
|
||
(buffer-local-value 'window-area-factor
|
||
(window-buffer next)))))
|
||
(edgesize (if horiz
|
||
(+ (window-height win) (window-height next))
|
||
(+ (window-width win) (window-width next))))
|
||
(diff (/ areadiff edgesize)))
|
||
(when (zerop diff)
|
||
;; Maybe diff is actually closer to 1 than to 0.
|
||
(setq diff (/ (* 3 areadiff) (* 2 edgesize))))
|
||
(when (and (zerop diff) (not (zerop areadiff)))
|
||
(setq diff (/ (+ areadiff carry) edgesize))
|
||
;; Change things smoothly.
|
||
(if (or (> diff 1) (< diff -1)) (setq diff (/ diff 2))))
|
||
(if (zerop diff)
|
||
;; Make sure negligible differences don't accumulate to
|
||
;; become significant.
|
||
(setq carry (+ carry areadiff))
|
||
(bw-adjust-window win diff horiz)
|
||
;; (sit-for 0.5)
|
||
(let ((change (cons win (window-edges win))))
|
||
;; If the same change has been seen already for this window,
|
||
;; we're most likely in an endless loop, so don't count it as
|
||
;; a change.
|
||
(unless (member change changelog)
|
||
(push change changelog)
|
||
(setq unchanged 0 carry 0)))))))
|
||
;; We've now basically balanced all the windows.
|
||
;; But there may be some minor off-by-one imbalance left over,
|
||
;; so let's do some fine tuning.
|
||
;; (bw-finetune wins)
|
||
;; (message "Done in %d rounds" round)
|
||
))
|
||
|
||
|
||
(defcustom display-buffer-function nil
|
||
"If non-nil, function to call to handle `display-buffer'.
|
||
It will receive two args, the buffer and a flag which if non-nil
|
||
means that the currently selected window is not acceptable. It
|
||
should choose or create a window, display the specified buffer in
|
||
it, and return the window.
|
||
|
||
Commands such as `switch-to-buffer-other-window' and
|
||
`find-file-other-window' work using this function."
|
||
:type '(choice
|
||
(const nil)
|
||
(function :tag "function"))
|
||
:group 'windows)
|
||
|
||
(defun special-display-p (buffer-name)
|
||
"Return non-nil if a buffer named BUFFER-NAME gets a special frame.
|
||
If the value is t, `display-buffer' or `pop-to-buffer' would
|
||
create a special frame for that buffer using the default frame
|
||
parameters.
|
||
|
||
If the value is a list, it is a list of frame parameters that
|
||
would be used to make a frame for that buffer. The variables
|
||
`special-display-buffer-names' and `special-display-regexps'
|
||
control this."
|
||
(let (tmp)
|
||
(cond
|
||
((not (stringp buffer-name)))
|
||
;; Make sure to return t in the following two cases.
|
||
((member buffer-name special-display-buffer-names) t)
|
||
((setq tmp (assoc buffer-name special-display-buffer-names)) (cdr tmp))
|
||
((catch 'found
|
||
(dolist (regexp special-display-regexps)
|
||
(cond
|
||
((stringp regexp)
|
||
(when (string-match-p regexp buffer-name)
|
||
(throw 'found t)))
|
||
((and (consp regexp) (stringp (car regexp))
|
||
(string-match-p (car regexp) buffer-name))
|
||
(throw 'found (cdr regexp))))))))))
|
||
|
||
(defcustom special-display-buffer-names nil
|
||
"List of buffer names that should have their own special frames.
|
||
Displaying a buffer with `display-buffer' or `pop-to-buffer', if
|
||
its name is in this list, makes a special frame for it using
|
||
`special-display-function'. See also `special-display-regexps'.
|
||
|
||
An element of the list can be a list instead of just a string.
|
||
There are two ways to use a list as an element:
|
||
(BUFFER FRAME-PARAMETERS...) (BUFFER FUNCTION OTHER-ARGS...)
|
||
In the first case, the FRAME-PARAMETERS are pairs of the form
|
||
\(PARAMETER . VALUE); these parameter values are used to create
|
||
the frame. In the second case, FUNCTION is called with BUFFER as
|
||
the first argument, followed by the OTHER-ARGS--it can display
|
||
BUFFER in any way it likes. All this is done by the function
|
||
found in `special-display-function'.
|
||
|
||
If the specified frame parameters include (same-buffer . t), the
|
||
buffer is displayed in the currently selected window. Otherwise, if
|
||
they include (same-frame . t), the buffer is displayed in a new window
|
||
in the currently selected frame.
|
||
|
||
If this variable appears \"not to work\", because you add a name to it
|
||
but that buffer still appears in the selected window, look at the
|
||
values of `same-window-buffer-names' and `same-window-regexps'.
|
||
Those variables take precedence over this one."
|
||
:type '(repeat (choice :tag "Buffer"
|
||
:value ""
|
||
(string :format "%v")
|
||
(cons :tag "With attributes"
|
||
:format "%v"
|
||
:value ("" . nil)
|
||
(string :format "%v")
|
||
(repeat :tag "Attributes"
|
||
(cons :format "%v"
|
||
(symbol :tag "Parameter")
|
||
(sexp :tag "Value"))))))
|
||
:group 'frames)
|
||
|
||
(defcustom special-display-regexps nil
|
||
"List of regexps saying which buffers should have their own special frames.
|
||
When displaying a buffer with `display-buffer' or
|
||
`pop-to-buffer', if any regexp in this list matches the buffer
|
||
name, it makes a special frame for the buffer by calling
|
||
`special-display-function'.
|
||
|
||
An element of the list can be a list instead of just a string.
|
||
There are two ways to use a list as an element:
|
||
(REGEXP FRAME-PARAMETERS...) (REGEXP FUNCTION OTHER-ARGS...)
|
||
In the first case, the FRAME-PARAMETERS are pairs of the form
|
||
\(PARAMETER . VALUE); these parameter values are used to create
|
||
the frame. In the second case, FUNCTION is called with BUFFER as
|
||
the first argument, followed by the OTHER-ARGS--it can display
|
||
the buffer in any way it likes. All this is done by the function
|
||
found in `special-display-function'.
|
||
|
||
If the specified frame parameters include (same-buffer . t), the
|
||
buffer is displayed in the currently selected window. Otherwise,
|
||
if they include (same-frame . t), the buffer is displayed in a
|
||
new window in the currently selected frame.
|
||
|
||
If this variable appears \"not to work\", because you add a
|
||
regexp to it but the matching buffers still appear in the
|
||
selected window, look at the values of `same-window-buffer-names'
|
||
and `same-window-regexps'. Those variables take precedence over
|
||
this one."
|
||
:type '(repeat (choice :tag "Buffer"
|
||
:value ""
|
||
(regexp :format "%v")
|
||
(cons :tag "With attributes"
|
||
:format "%v"
|
||
:value ("" . nil)
|
||
(regexp :format "%v")
|
||
(repeat :tag "Attributes"
|
||
(cons :format "%v"
|
||
(symbol :tag "Parameter")
|
||
(sexp :tag "Value"))))))
|
||
:group 'frames)
|
||
|
||
(defcustom special-display-function 'special-display-popup-frame
|
||
"Function to call to make a new frame for a special buffer.
|
||
It is called with two arguments, the buffer and optional buffer
|
||
specific data, and should return a window displaying that buffer.
|
||
The default value normally makes a separate frame for the buffer,
|
||
using `special-display-frame-alist' to specify the frame
|
||
parameters.
|
||
|
||
But if the buffer specific data includes (same-buffer . t) then
|
||
the buffer is displayed in the current selected window.
|
||
Otherwise if it includes (same-frame . t) then the buffer is
|
||
displayed in a new window in the currently selected frame.
|
||
|
||
A buffer is special if it is listed in
|
||
`special-display-buffer-names' or matches a regexp in
|
||
`special-display-regexps'."
|
||
:type 'function
|
||
:group 'frames)
|
||
|
||
(defun same-window-p (buffer-name)
|
||
"Return non-nil if a buffer named BUFFER-NAME would be shown in the \"same\" window.
|
||
This function returns non-nil if `display-buffer' or
|
||
`pop-to-buffer' would show a buffer named BUFFER-NAME in the
|
||
selected rather than \(as usual\) some other window. See
|
||
`same-window-buffer-names' and `same-window-regexps'."
|
||
(cond
|
||
((not (stringp buffer-name)))
|
||
;; The elements of `same-window-buffer-names' can be buffer
|
||
;; names or cons cells whose cars are buffer names.
|
||
((member buffer-name same-window-buffer-names))
|
||
((assoc buffer-name same-window-buffer-names))
|
||
((catch 'found
|
||
(dolist (regexp same-window-regexps)
|
||
;; The elements of `same-window-regexps' can be regexps
|
||
;; or cons cells whose cars are regexps.
|
||
(when (or (and (stringp regexp)
|
||
(string-match regexp buffer-name))
|
||
(and (consp regexp) (stringp (car regexp))
|
||
(string-match-p (car regexp) buffer-name)))
|
||
(throw 'found t)))))))
|
||
|
||
(defcustom same-window-buffer-names nil
|
||
"List of names of buffers that should appear in the \"same\" window.
|
||
`display-buffer' and `pop-to-buffer' show a buffer whose name is
|
||
on this list in the selected rather than some other window.
|
||
|
||
An element of this list can be a cons cell instead of just a
|
||
string. In that case the car must be a string specifying the
|
||
buffer name. This is for compatibility with
|
||
`special-display-buffer-names'; the cdr of the cons cell is
|
||
ignored.
|
||
|
||
See also `same-window-regexps'."
|
||
:type '(repeat (string :format "%v"))
|
||
:group 'windows)
|
||
|
||
(defcustom same-window-regexps nil
|
||
"List of regexps saying which buffers should appear in the \"same\" window.
|
||
`display-buffer' and `pop-to-buffer' show a buffer whose name
|
||
matches a regexp on this list in the selected rather than some
|
||
other window.
|
||
|
||
An element of this list can be a cons cell instead of just a
|
||
string. In that case the car must be a string, which specifies
|
||
the buffer name. This is for compatibility with
|
||
`special-display-buffer-names'; the cdr of the cons cell is
|
||
ignored.
|
||
|
||
See also `same-window-buffer-names'."
|
||
:type '(repeat (regexp :format "%v"))
|
||
:group 'windows)
|
||
|
||
(defcustom pop-up-frames nil
|
||
"Non-nil means `display-buffer' should make a separate frame."
|
||
:type 'boolean
|
||
:group 'windows)
|
||
|
||
(defcustom display-buffer-reuse-frames nil
|
||
"Non-nil means `display-buffer' should reuse frames.
|
||
If the buffer in question is already displayed in a frame, raise
|
||
that frame."
|
||
:type 'boolean
|
||
:version "21.1"
|
||
:group 'windows)
|
||
|
||
(defcustom pop-up-windows t
|
||
"Non-nil means `display-buffer' should make a new window."
|
||
:type 'boolean
|
||
:group 'windows)
|
||
|
||
(defcustom split-height-threshold 80
|
||
"Minimum height of window to be split vertically.
|
||
If the value is a number, `display-buffer' can split a window
|
||
only if it has at least as many lines. If the value is nil,
|
||
`display-buffer' cannot split a window vertically.
|
||
|
||
If the window is the only window on its frame, `display-buffer'
|
||
can split it regardless of this value."
|
||
:type '(choice (const nil) (number :tag "lines"))
|
||
:version "23.1"
|
||
:group 'windows)
|
||
|
||
(defcustom split-width-threshold 160
|
||
"Minimum width of window to be split horizontally.
|
||
If the value is a number, `display-buffer' can split a window
|
||
only if it has at least as many columns. If the value is nil,
|
||
`display-buffer' cannot split a window horizontally."
|
||
:type '(choice (const nil) (number :tag "columns"))
|
||
:version "23.1"
|
||
:group 'windows)
|
||
|
||
(defcustom split-window-preferred-function nil
|
||
"Function used by `display-buffer' to split windows.
|
||
If non-nil, a function called with a window as single argument
|
||
supposed to split that window and return the new window. If the
|
||
function returns nil the window is not split.
|
||
|
||
If nil, `display-buffer' will split the window respecting the
|
||
values of `split-height-threshold' and `split-width-threshold'."
|
||
:type '(choice (const nil) (function :tag "Function"))
|
||
:version "23.1"
|
||
:group 'windows)
|
||
|
||
(defun window--splittable-p (window &optional horizontal)
|
||
"Return non-nil if window WINDOW can be split evenly.
|
||
Optional argument HORIZONTAL non-nil means check whether WINDOW
|
||
can be split horizontally.
|
||
|
||
WINDOW can be split vertically when the following conditions
|
||
hold:
|
||
|
||
- `window-size-fixed' is either nil or equals `width' for the
|
||
buffer of WINDOW.
|
||
|
||
- `split-height-threshold' is a number and WINDOW is at least as
|
||
high as `split-height-threshold'.
|
||
|
||
- When WINDOW is split evenly, the emanating windows are at least
|
||
`window-min-height' lines tall and can accommodate at least one
|
||
line plus - if WINDOW has one - a modeline.
|
||
|
||
WINDOW can be split horizontally when the following conditions
|
||
hold:
|
||
|
||
- `window-size-fixed' is either nil or equals `height' for the
|
||
buffer of WINDOW.
|
||
|
||
- `split-width-threshold' is a number and WINDOW is at least as
|
||
wide as `split-width-threshold'.
|
||
|
||
- When WINDOW is split evenly, the emanating windows are at least
|
||
`window-min-width' or two (whichever is larger) columns wide."
|
||
(when (window-live-p window)
|
||
(with-current-buffer (window-buffer window)
|
||
(if horizontal
|
||
;; A window can be split horizontally when its width is not
|
||
;; fixed, it is at least `split-width-threshold' columns wide
|
||
;; and at least twice as wide as `window-min-width' and 2 (the
|
||
;; latter value is hardcoded).
|
||
(and (memq window-size-fixed '(nil height))
|
||
;; Testing `window-full-width-p' here hardly makes any
|
||
;; sense nowadays. This can be done more intuitively by
|
||
;; setting up `split-width-threshold' appropriately.
|
||
(numberp split-width-threshold)
|
||
(>= (window-width window)
|
||
(max split-width-threshold
|
||
(* 2 (max window-min-width 2)))))
|
||
;; A window can be split vertically when its height is not
|
||
;; fixed, it is at least `split-height-threshold' lines high,
|
||
;; and it is at least twice as high as `window-min-height' and 2
|
||
;; if it has a modeline or 1.
|
||
(and (memq window-size-fixed '(nil width))
|
||
(numberp split-height-threshold)
|
||
(>= (window-height window)
|
||
(max split-height-threshold
|
||
(* 2 (max window-min-height
|
||
(if mode-line-format 2 1))))))))))
|
||
|
||
(defun window--try-to-split-window (window)
|
||
"Split window WINDOW if it is splittable.
|
||
See `window--splittable-p' for how to determine whether a window
|
||
is splittable. If WINDOW can be split, return the value returned
|
||
by `split-window' or `split-window-preferred-function'."
|
||
(when (and (window-live-p window)
|
||
(not (frame-parameter (window-frame window) 'unsplittable)))
|
||
(if (functionp split-window-preferred-function)
|
||
;; `split-window-preferred-function' is specified, so use it.
|
||
(funcall split-window-preferred-function window)
|
||
(or (and (window--splittable-p window)
|
||
;; Split window vertically.
|
||
(split-window window))
|
||
(and (window--splittable-p window t)
|
||
;; Split window horizontally.
|
||
(split-window window nil t))
|
||
(and (eq window (frame-root-window (window-frame window)))
|
||
(not (window-minibuffer-p window))
|
||
;; If WINDOW is the only window on its frame and not the
|
||
;; minibuffer window, attempt to split it vertically
|
||
;; disregarding the value of `split-height-threshold'.
|
||
(let ((split-height-threshold 0))
|
||
(and (window--splittable-p window)
|
||
(split-window window))))))))
|
||
|
||
(defun window--frame-usable-p (frame)
|
||
"Return frame FRAME if it can be used to display another buffer."
|
||
(when (framep frame)
|
||
(let ((window (frame-root-window frame)))
|
||
;; `frame-root-window' may be an internal window which is considered
|
||
;; "dead" by `window-live-p'. Hence if `window' is not live we
|
||
;; implicitly know that `frame' has a visible window we can use.
|
||
(when (or (not (window-live-p window))
|
||
(and (not (window-minibuffer-p window))
|
||
(not (window-dedicated-p window))))
|
||
frame))))
|
||
|
||
(defcustom even-window-heights t
|
||
"If non-nil `display-buffer' will try to even window heights.
|
||
Otherwise `display-buffer' will leave the window configuration
|
||
alone. Heights are evened only when `display-buffer' chooses a
|
||
window that appears above or below the selected window."
|
||
:type 'boolean
|
||
:group 'windows)
|
||
|
||
(defun window--even-window-heights (window)
|
||
"Even heights of window WINDOW and selected window.
|
||
Do this only if these windows are vertically adjacent to each
|
||
other, `even-window-heights' is non-nil, and the selected window
|
||
is higher than WINDOW."
|
||
(when (and even-window-heights
|
||
(not (eq window (selected-window)))
|
||
;; Don't resize minibuffer windows.
|
||
(not (window-minibuffer-p (selected-window)))
|
||
(> (window-height (selected-window)) (window-height window))
|
||
(eq (window-frame window) (window-frame (selected-window)))
|
||
(let ((sel-edges (window-edges (selected-window)))
|
||
(win-edges (window-edges window)))
|
||
(and (= (nth 0 sel-edges) (nth 0 win-edges))
|
||
(= (nth 2 sel-edges) (nth 2 win-edges))
|
||
(or (= (nth 1 sel-edges) (nth 3 win-edges))
|
||
(= (nth 3 sel-edges) (nth 1 win-edges))))))
|
||
(let ((window-min-height 1))
|
||
;; Don't throw an error if we can't even window heights for
|
||
;; whatever reason.
|
||
(condition-case nil
|
||
(enlarge-window (/ (- (window-height window) (window-height)) 2))
|
||
(error nil)))))
|
||
|
||
(defun window--display-buffer-1 (window)
|
||
"Deiconify the frame containing the window WINDOW.
|
||
Do not deiconify the selected frame. Return WINDOW."
|
||
(let* ((frame (window-frame window))
|
||
(visible (frame-visible-p frame)))
|
||
(unless (or (not visible)
|
||
;; Assume the selected frame is already visible enough.
|
||
(eq frame (selected-frame))
|
||
;; Assume the frame from which we invoked the minibuffer
|
||
;; is visible.
|
||
(and (minibuffer-window-active-p (selected-window))
|
||
(eq frame (window-frame (minibuffer-selected-window)))))
|
||
(when (eq visible 'icon)
|
||
(make-frame-visible frame))
|
||
(raise-frame frame))
|
||
window))
|
||
|
||
(defun window--display-buffer-2 (buffer window)
|
||
"Display buffer BUFFER in window WINDOW and make its frame visible.
|
||
Return WINDOW."
|
||
(when (and (buffer-live-p buffer) (window-live-p window))
|
||
(set-window-buffer window buffer)
|
||
(window--display-buffer-1 window)))
|
||
|
||
(defun display-buffer (buffer-or-name &optional not-this-window frame)
|
||
"Make buffer BUFFER-OR-NAME appear in some window but don't select it.
|
||
BUFFER-OR-NAME must be a buffer or the name of an existing
|
||
buffer. Return the window chosen to display BUFFER-OR-NAME or
|
||
nil if no such window is found.
|
||
|
||
Optional argument NOT-THIS-WINDOW non-nil means display the
|
||
buffer in a window other than the selected one, even if it is
|
||
already displayed in the selected window.
|
||
|
||
Optional argument FRAME specifies which frames to investigate
|
||
when the specified buffer is already displayed. If the buffer is
|
||
already displayed in some window on one of these frames simply
|
||
return that window. Possible values of FRAME are:
|
||
|
||
`visible' - consider windows on all visible frames.
|
||
|
||
0 - consider windows on all visible or iconified frames.
|
||
|
||
t - consider windows on all frames.
|
||
|
||
A specific frame - consider windows on that frame only.
|
||
|
||
nil - consider windows on the selected frame \(actually the
|
||
last non-minibuffer frame\) only. If, however, either
|
||
`display-buffer-reuse-frames' or `pop-up-frames' is non-nil,
|
||
consider all visible or iconified frames."
|
||
(interactive "BDisplay buffer:\nP")
|
||
(let* ((can-use-selected-window
|
||
;; The selected window is usable unless either NOT-THIS-WINDOW
|
||
;; is non-nil, it is dedicated to its buffer, or it is the
|
||
;; `minibuffer-window'.
|
||
(not (or not-this-window
|
||
(window-dedicated-p (selected-window))
|
||
(window-minibuffer-p))))
|
||
(buffer (if (bufferp buffer-or-name)
|
||
buffer-or-name
|
||
(get-buffer buffer-or-name)))
|
||
(name-of-buffer (buffer-name buffer))
|
||
;; `frame-to-use' is the frame where to show `buffer' - either
|
||
;; the selected frame or the last nonminibuffer frame.
|
||
(frame-to-use
|
||
(or (window--frame-usable-p (selected-frame))
|
||
(window--frame-usable-p (last-nonminibuffer-frame))))
|
||
;; `window-to-use' is the window we use for showing `buffer'.
|
||
window-to-use)
|
||
(cond
|
||
((not (buffer-live-p buffer))
|
||
(error "No such buffer %s" buffer))
|
||
(display-buffer-function
|
||
;; Let `display-buffer-function' do the job.
|
||
(funcall display-buffer-function buffer not-this-window))
|
||
((and (not not-this-window)
|
||
(eq (window-buffer (selected-window)) buffer))
|
||
;; The selected window already displays BUFFER and
|
||
;; `not-this-window' is nil, so use it.
|
||
(window--display-buffer-1 (selected-window)))
|
||
((and can-use-selected-window (same-window-p name-of-buffer))
|
||
;; If the buffer's name tells us to use the selected window do so.
|
||
(window--display-buffer-2 buffer (selected-window)))
|
||
((let ((frames (or frame
|
||
(and (or pop-up-frames display-buffer-reuse-frames
|
||
(not (last-nonminibuffer-frame)))
|
||
0)
|
||
(last-nonminibuffer-frame))))
|
||
(and (setq window-to-use (get-buffer-window buffer frames))
|
||
(or can-use-selected-window
|
||
(not (eq (selected-window) window-to-use)))))
|
||
;; If the buffer is already displayed in some window use that.
|
||
(window--display-buffer-1 window-to-use))
|
||
((and special-display-function
|
||
;; `special-display-p' returns either t or a list of frame
|
||
;; parameters to pass to `special-display-function'.
|
||
(let ((pars (special-display-p name-of-buffer)))
|
||
(when pars
|
||
(funcall special-display-function
|
||
buffer (if (listp pars) pars))))))
|
||
((or pop-up-frames (not frame-to-use))
|
||
;; We want or need a new frame.
|
||
(window--display-buffer-2
|
||
buffer (frame-selected-window (funcall pop-up-frame-function))))
|
||
((and pop-up-windows
|
||
;; Make a new window.
|
||
(or (not (frame-parameter frame-to-use 'unsplittable))
|
||
;; If the selected frame cannot be split look at
|
||
;; `last-nonminibuffer-frame'.
|
||
(and (eq frame-to-use (selected-frame))
|
||
(setq frame-to-use (last-nonminibuffer-frame))
|
||
(window--frame-usable-p frame-to-use)
|
||
(not (frame-parameter frame-to-use 'unsplittable))))
|
||
;; Attempt to split largest or least recently used window.
|
||
(setq window-to-use
|
||
(or (window--try-to-split-window
|
||
(get-largest-window frame-to-use t))
|
||
(window--try-to-split-window
|
||
(get-lru-window frame-to-use t))))
|
||
(window--display-buffer-2 buffer window-to-use)))
|
||
((setq window-to-use
|
||
;; Reuse an existing window.
|
||
(or (get-lru-window frame-to-use)
|
||
(get-buffer-window buffer 'visible)
|
||
(get-largest-window 'visible nil)
|
||
(get-buffer-window buffer 0)
|
||
(get-largest-window 0 nil)
|
||
(frame-selected-window (funcall pop-up-frame-function))))
|
||
(window--even-window-heights window-to-use)
|
||
(window--display-buffer-2 buffer window-to-use)))))
|
||
|
||
(defun pop-to-buffer (buffer-or-name &optional other-window norecord)
|
||
"Select buffer BUFFER-OR-NAME in some window, preferably a different one.
|
||
BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
|
||
nil. If BUFFER-OR-NAME is a string not naming an existent
|
||
buffer, create a buffer with that name. If BUFFER-OR-NAME is
|
||
nil, choose some other buffer.
|
||
|
||
If `pop-up-windows' is non-nil, windows can be split to display
|
||
the buffer. If optional second arg OTHER-WINDOW is non-nil,
|
||
insist on finding another window even if the specified buffer is
|
||
already visible in the selected window, and ignore
|
||
`same-window-regexps' and `same-window-buffer-names'.
|
||
|
||
If the window to show BUFFER-OR-NAME is not on the selected
|
||
frame, raise that window's frame and give it input focus.
|
||
|
||
This function returns the buffer it switched to. This uses the
|
||
function `display-buffer' as a subroutine; see the documentation
|
||
of `display-buffer' for additional customization information.
|
||
|
||
Optional third arg NORECORD non-nil means do not put this buffer
|
||
at the front of the list of recently selected ones."
|
||
(let ((buffer
|
||
;; FIXME: This behavior is carried over from the previous C version
|
||
;; of pop-to-buffer, but really we should use just
|
||
;; `get-buffer' here.
|
||
(if (null buffer-or-name) (other-buffer (current-buffer))
|
||
(or (get-buffer buffer-or-name)
|
||
(let ((buf (get-buffer-create buffer-or-name)))
|
||
(set-buffer-major-mode buf)
|
||
buf))))
|
||
(old-window (selected-window))
|
||
(old-frame (selected-frame))
|
||
new-window new-frame)
|
||
(set-buffer buffer)
|
||
(setq new-window (display-buffer buffer other-window) norecord)
|
||
(unless (eq new-window old-window)
|
||
;; `display-buffer' has chosen another window, select it.
|
||
(select-window new-window)
|
||
(setq new-frame (window-frame new-window))
|
||
(unless (eq new-frame old-frame)
|
||
;; `display-buffer' has chosen another frame, make sure it gets
|
||
;; input focus and is risen.
|
||
(select-frame-set-input-focus new-frame)))
|
||
buffer))
|
||
|
||
;; I think this should be the default; I think people will prefer it--rms.
|
||
(defcustom split-window-keep-point t
|
||
"If non-nil, \\[split-window-vertically] 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.
|
||
|
||
This option applies only to `split-window-vertically' and
|
||
functions that call it. `split-window' always keeps the original
|
||
point in both children."
|
||
:type 'boolean
|
||
:group 'windows)
|
||
|
||
(defun split-window-vertically (&optional arg)
|
||
"Split current window into two windows, one above the other.
|
||
The uppermost window gets ARG lines and the other gets the rest.
|
||
Negative ARG means select the size of the lowermost window instead.
|
||
With no argument, split equally or close to it.
|
||
Both windows display the same buffer now current.
|
||
|
||
If the variable `split-window-keep-point' is non-nil, both new windows
|
||
will get the same value of point as the current window. This is often
|
||
more convenient for editing. The upper window is the selected window.
|
||
|
||
Otherwise, we choose window starts so as to minimize the amount of
|
||
redisplay; this is convenient on slow terminals. The new selected
|
||
window is the one that the current value of point appears in. The
|
||
value of point can change if the text around point is hidden by the
|
||
new mode line.
|
||
|
||
Regardless of the value of `split-window-keep-point', the upper
|
||
window is the original one and the return value is the new, lower
|
||
window."
|
||
(interactive "P")
|
||
(let ((old-w (selected-window))
|
||
(old-point (point))
|
||
(size (and arg (prefix-numeric-value arg)))
|
||
(window-full-p nil)
|
||
new-w bottom moved)
|
||
(and size (< size 0) (setq size (+ (window-height) size)))
|
||
(setq new-w (split-window nil size))
|
||
(or split-window-keep-point
|
||
(progn
|
||
(save-excursion
|
||
(set-buffer (window-buffer))
|
||
(goto-char (window-start))
|
||
(setq moved (vertical-motion (window-height)))
|
||
(set-window-start new-w (point))
|
||
(if (> (point) (window-point new-w))
|
||
(set-window-point new-w (point)))
|
||
(and (= moved (window-height))
|
||
(progn
|
||
(setq window-full-p t)
|
||
(vertical-motion -1)))
|
||
(setq bottom (point)))
|
||
(and window-full-p
|
||
(<= bottom (point))
|
||
(set-window-point old-w (1- bottom)))
|
||
(and window-full-p
|
||
(<= (window-start new-w) old-point)
|
||
(progn
|
||
(set-window-point new-w old-point)
|
||
(select-window new-w)))))
|
||
(split-window-save-restore-data new-w old-w)))
|
||
|
||
;; This is to avoid compiler warnings.
|
||
(defvar view-return-to-alist)
|
||
|
||
(defun split-window-save-restore-data (new-w old-w)
|
||
(with-current-buffer (window-buffer)
|
||
(if view-mode
|
||
(let ((old-info (assq old-w view-return-to-alist)))
|
||
(if old-info
|
||
(push (cons new-w (cons (car (cdr old-info)) t))
|
||
view-return-to-alist))))
|
||
new-w))
|
||
|
||
(defun split-window-horizontally (&optional arg)
|
||
"Split current window into two windows side by side.
|
||
This window becomes the leftmost of the two, and gets ARG columns.
|
||
Negative ARG means select the size of the rightmost window instead.
|
||
The argument includes the width of the window's scroll bar; if there
|
||
are no scroll bars, it includes the width of the divider column
|
||
to the window's right, if any. No ARG means split equally.
|
||
|
||
The original, leftmost window remains selected.
|
||
The return value is the new, rightmost window."
|
||
(interactive "P")
|
||
(let ((old-w (selected-window))
|
||
(size (and arg (prefix-numeric-value arg))))
|
||
(and size (< size 0)
|
||
(setq size (+ (window-width) size)))
|
||
(split-window-save-restore-data (split-window nil size t) old-w)))
|
||
|
||
|
||
(defun set-window-text-height (window height)
|
||
"Sets the height in lines of the text display area of WINDOW to HEIGHT.
|
||
This doesn't include the mode-line (or header-line if any) or any
|
||
partial-height lines in the text display area.
|
||
|
||
If WINDOW is nil, the selected window is used.
|
||
|
||
Note that the current implementation of this function cannot always set
|
||
the height exactly, but attempts to be conservative, by allocating more
|
||
lines than are actually needed in the case where some error may be present."
|
||
(let ((delta (- height (window-text-height window))))
|
||
(unless (zerop delta)
|
||
;; Setting window-min-height to a value like 1 can lead to very
|
||
;; bizarre displays because it also allows Emacs to make *other*
|
||
;; windows 1-line tall, which means that there's no more space for
|
||
;; the modeline.
|
||
(let ((window-min-height (min 2 height))) ;One text line plus a modeline.
|
||
(if (and window (not (eq window (selected-window))))
|
||
(save-selected-window
|
||
(select-window window)
|
||
(enlarge-window delta))
|
||
(enlarge-window delta))))))
|
||
|
||
|
||
(defun enlarge-window-horizontally (arg)
|
||
"Make current window ARG columns wider."
|
||
(interactive "p")
|
||
(enlarge-window arg t))
|
||
|
||
(defun shrink-window-horizontally (arg)
|
||
"Make current window ARG columns narrower."
|
||
(interactive "p")
|
||
(shrink-window arg t))
|
||
|
||
(defun window-buffer-height (window)
|
||
"Return the height (in screen lines) of the buffer that WINDOW is displaying."
|
||
(with-current-buffer (window-buffer window)
|
||
(max 1
|
||
(count-screen-lines (point-min) (point-max)
|
||
;; If buffer ends with a newline, ignore it when
|
||
;; counting height unless point is after it.
|
||
(eobp)
|
||
window))))
|
||
|
||
(defun count-screen-lines (&optional beg end count-final-newline window)
|
||
"Return the number of screen lines in the region.
|
||
The number of screen lines may be different from the number of actual lines,
|
||
due to line breaking, display table, etc.
|
||
|
||
Optional arguments BEG and END default to `point-min' and `point-max'
|
||
respectively.
|
||
|
||
If region ends with a newline, ignore it unless optional third argument
|
||
COUNT-FINAL-NEWLINE is non-nil.
|
||
|
||
The optional fourth argument WINDOW specifies the window used for obtaining
|
||
parameters such as width, horizontal scrolling, and so on. The default is
|
||
to use the selected window's parameters.
|
||
|
||
Like `vertical-motion', `count-screen-lines' always uses the current buffer,
|
||
regardless of which buffer is displayed in WINDOW. This makes possible to use
|
||
`count-screen-lines' in any buffer, whether or not it is currently displayed
|
||
in some window."
|
||
(unless beg
|
||
(setq beg (point-min)))
|
||
(unless end
|
||
(setq end (point-max)))
|
||
(if (= beg end)
|
||
0
|
||
(save-excursion
|
||
(save-restriction
|
||
(widen)
|
||
(narrow-to-region (min beg end)
|
||
(if (and (not count-final-newline)
|
||
(= ?\n (char-before (max beg end))))
|
||
(1- (max beg end))
|
||
(max beg end)))
|
||
(goto-char (point-min))
|
||
(1+ (vertical-motion (buffer-size) window))))))
|
||
|
||
(defun fit-window-to-buffer (&optional window max-height min-height)
|
||
"Make WINDOW the right height to display its contents exactly.
|
||
If WINDOW is omitted or nil, it defaults to the selected window.
|
||
If the optional argument MAX-HEIGHT is supplied, it is the maximum height
|
||
the window is allowed to be, defaulting to the frame height.
|
||
If the optional argument MIN-HEIGHT is supplied, it is the minimum
|
||
height the window is allowed to be, defaulting to `window-min-height'.
|
||
|
||
The heights in MAX-HEIGHT and MIN-HEIGHT include the mode-line and/or
|
||
header-line."
|
||
(interactive)
|
||
|
||
(when (null window)
|
||
(setq window (selected-window)))
|
||
(when (null max-height)
|
||
(setq max-height (frame-height (window-frame window))))
|
||
|
||
(let* ((buf
|
||
;; Buffer that is displayed in WINDOW
|
||
(window-buffer window))
|
||
(window-height
|
||
;; The current height of WINDOW
|
||
(window-height window))
|
||
(desired-height
|
||
;; The height necessary to show the buffer displayed by WINDOW
|
||
;; (`count-screen-lines' always works on the current buffer).
|
||
(with-current-buffer buf
|
||
(+ (count-screen-lines)
|
||
;; If the buffer is empty, (count-screen-lines) is
|
||
;; zero. But, even in that case, we need one text line
|
||
;; for cursor.
|
||
(if (= (point-min) (point-max))
|
||
1 0)
|
||
;; For non-minibuffers, count the mode-line, if any
|
||
(if (and (not (window-minibuffer-p window))
|
||
mode-line-format)
|
||
1 0)
|
||
;; Count the header-line, if any
|
||
(if header-line-format 1 0))))
|
||
(delta
|
||
;; Calculate how much the window height has to change to show
|
||
;; desired-height lines, constrained by MIN-HEIGHT and MAX-HEIGHT.
|
||
(- (max (min desired-height max-height)
|
||
(or min-height window-min-height))
|
||
window-height)))
|
||
|
||
;; Don't try to redisplay with the cursor at the end
|
||
;; on its own line--that would force a scroll and spoil things.
|
||
(when (with-current-buffer buf
|
||
(and (eobp) (bolp) (not (bobp))))
|
||
(set-window-point window (1- (window-point window))))
|
||
|
||
(save-selected-window
|
||
(select-window window)
|
||
|
||
;; Adjust WINDOW to the nominally correct size (which may actually
|
||
;; be slightly off because of variable height text, etc).
|
||
(unless (zerop delta)
|
||
(enlarge-window delta))
|
||
|
||
;; Check if the last line is surely fully visible. If not,
|
||
;; enlarge the window.
|
||
(let ((end (with-current-buffer buf
|
||
(save-excursion
|
||
(goto-char (point-max))
|
||
(when (and (bolp) (not (bobp)))
|
||
;; Don't include final newline
|
||
(backward-char 1))
|
||
(when truncate-lines
|
||
;; If line-wrapping is turned off, test the
|
||
;; beginning of the last line for visibility
|
||
;; instead of the end, as the end of the line
|
||
;; could be invisible by virtue of extending past
|
||
;; the edge of the window.
|
||
(forward-line 0))
|
||
(point)))))
|
||
(set-window-vscroll window 0)
|
||
(while (and (< desired-height max-height)
|
||
(= desired-height (window-height window))
|
||
(not (pos-visible-in-window-p end window)))
|
||
(enlarge-window 1)
|
||
(setq desired-height (1+ desired-height)))))))
|
||
|
||
(defun shrink-window-if-larger-than-buffer (&optional window)
|
||
"Shrink the WINDOW to be as small as possible to display its contents.
|
||
If WINDOW is omitted or nil, it defaults to the selected window.
|
||
Do not shrink to less than `window-min-height' lines.
|
||
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 shrinking this window would also shrink another window,
|
||
or if the window is the only window of its frame."
|
||
(interactive)
|
||
(when (null window)
|
||
(setq window (selected-window)))
|
||
(let* ((frame (window-frame window))
|
||
(mini (frame-parameter frame 'minibuffer))
|
||
(edges (window-edges window)))
|
||
(if (and (not (eq window (frame-root-window frame)))
|
||
(window-safely-shrinkable-p)
|
||
(pos-visible-in-window-p (point-min) window)
|
||
(not (eq mini 'only))
|
||
(or (not mini)
|
||
(let ((mini-window (minibuffer-window frame)))
|
||
(or (null mini-window)
|
||
(not (eq frame (window-frame mini-window)))
|
||
(< (nth 3 edges)
|
||
(nth 1 (window-edges mini-window)))
|
||
(> (nth 1 edges)
|
||
(frame-parameter frame 'menu-bar-lines))))))
|
||
(fit-window-to-buffer window (window-height window)))))
|
||
|
||
(defun kill-buffer-and-window ()
|
||
"Kill the current buffer and delete the selected window."
|
||
(interactive)
|
||
(let ((window-to-delete (selected-window))
|
||
(buffer-to-kill (current-buffer))
|
||
(delete-window-hook (lambda ()
|
||
(condition-case nil
|
||
(delete-window)
|
||
(error nil)))))
|
||
(unwind-protect
|
||
(progn
|
||
(add-hook 'kill-buffer-hook delete-window-hook t t)
|
||
(if (kill-buffer (current-buffer))
|
||
;; If `delete-window' failed before, we rerun it to regenerate
|
||
;; the error so it can be seen in the echo area.
|
||
(when (eq (selected-window) window-to-delete)
|
||
(delete-window))))
|
||
;; If the buffer is not dead for some reason (probably because
|
||
;; of a `quit' signal), remove the hook again.
|
||
(condition-case nil
|
||
(with-current-buffer buffer-to-kill
|
||
(remove-hook 'kill-buffer-hook delete-window-hook t))
|
||
(error nil)))))
|
||
|
||
(defun quit-window (&optional kill window)
|
||
"Quit the current buffer. Bury it, and maybe delete the selected frame.
|
||
\(The frame is deleted if it contains a dedicated window for the buffer.)
|
||
With a prefix argument, kill the buffer instead.
|
||
|
||
Noninteractively, if KILL is non-nil, then kill the current buffer,
|
||
otherwise bury it.
|
||
|
||
If WINDOW is non-nil, it specifies a window; we delete that window,
|
||
and the buffer that is killed or buried is the one in that window."
|
||
(interactive "P")
|
||
(let ((buffer (window-buffer window))
|
||
(frame (window-frame (or window (selected-window))))
|
||
(window-solitary
|
||
(save-selected-window
|
||
(if window
|
||
(select-window window))
|
||
(one-window-p t)))
|
||
window-handled)
|
||
|
||
(save-selected-window
|
||
(if window
|
||
(select-window window))
|
||
(or (window-minibuffer-p)
|
||
(window-dedicated-p (selected-window))
|
||
(switch-to-buffer (other-buffer))))
|
||
|
||
;; Get rid of the frame, if it has just one dedicated window
|
||
;; and other visible frames exist.
|
||
(and (or (window-minibuffer-p) (window-dedicated-p window))
|
||
(delq frame (visible-frame-list))
|
||
window-solitary
|
||
(if (and (eq default-minibuffer-frame frame)
|
||
(= 1 (length (minibuffer-frame-list))))
|
||
(setq window nil)
|
||
(delete-frame frame)
|
||
(setq window-handled t)))
|
||
|
||
;; Deal with the buffer.
|
||
(if kill
|
||
(kill-buffer buffer)
|
||
(bury-buffer buffer))
|
||
|
||
;; Maybe get rid of the window.
|
||
(and window (not window-handled) (not window-solitary)
|
||
(delete-window window))))
|
||
|
||
(defvar recenter-last-op nil
|
||
"Indicates the last recenter operation performed.
|
||
Possible values: `top', `middle', `bottom'.")
|
||
|
||
(defun recenter-top-bottom (&optional arg)
|
||
"Move current line to window center, top, and bottom, successively.
|
||
With no prefix argument, the first call redraws the frame and
|
||
centers point vertically within the window. Successive calls
|
||
scroll the window, placing point on the top, bottom, and middle
|
||
consecutively. The cycling order is middle -> top -> bottom.
|
||
|
||
A prefix argument is handled like `recenter':
|
||
With numeric prefix ARG, move current line to window-line ARG.
|
||
With plain `C-u', move current line to window center.
|
||
|
||
Top and bottom destinations are actually `scroll-margin' lines
|
||
the from true window top and bottom."
|
||
(interactive "P")
|
||
(cond
|
||
(arg (recenter arg)) ; Always respect ARG.
|
||
((or (not (eq this-command last-command))
|
||
(eq recenter-last-op 'bottom))
|
||
(setq recenter-last-op 'middle)
|
||
(recenter))
|
||
(t
|
||
(let ((this-scroll-margin
|
||
(min (max 0 scroll-margin)
|
||
(truncate (/ (window-body-height) 4.0)))))
|
||
(cond ((eq recenter-last-op 'middle)
|
||
(setq recenter-last-op 'top)
|
||
(recenter this-scroll-margin))
|
||
((eq recenter-last-op 'top)
|
||
(setq recenter-last-op 'bottom)
|
||
(recenter (- -1 this-scroll-margin))))))))
|
||
|
||
(define-key global-map [?\C-l] 'recenter-top-bottom)
|
||
|
||
(defvar mouse-autoselect-window-timer nil
|
||
"Timer used by delayed window autoselection.")
|
||
|
||
(defvar mouse-autoselect-window-position nil
|
||
"Last mouse position recorded by delayed window autoselection.")
|
||
|
||
(defvar mouse-autoselect-window-window nil
|
||
"Last window recorded by delayed window autoselection.")
|
||
|
||
(defvar mouse-autoselect-window-state nil
|
||
"When non-nil, special state of delayed window autoselection.
|
||
Possible values are `suspend' \(suspend autoselection after a menu or
|
||
scrollbar interaction\) and `select' \(the next invocation of
|
||
'handle-select-window' shall select the window immediately\).")
|
||
|
||
(defun mouse-autoselect-window-cancel (&optional force)
|
||
"Cancel delayed window autoselection.
|
||
Optional argument FORCE means cancel unconditionally."
|
||
(unless (and (not force)
|
||
;; Don't cancel for select-window or select-frame events
|
||
;; or when the user drags a scroll bar.
|
||
(or (memq this-command
|
||
'(handle-select-window handle-switch-frame))
|
||
(and (eq this-command 'scroll-bar-toolkit-scroll)
|
||
(memq (nth 4 (event-end last-input-event))
|
||
'(handle end-scroll)))))
|
||
(setq mouse-autoselect-window-state nil)
|
||
(when (timerp mouse-autoselect-window-timer)
|
||
(cancel-timer mouse-autoselect-window-timer))
|
||
(remove-hook 'pre-command-hook 'mouse-autoselect-window-cancel)))
|
||
|
||
(defun mouse-autoselect-window-start (mouse-position &optional window suspend)
|
||
"Start delayed window autoselection.
|
||
MOUSE-POSITION is the last position where the mouse was seen as returned
|
||
by `mouse-position'. Optional argument WINDOW non-nil denotes the
|
||
window where the mouse was seen. Optional argument SUSPEND non-nil
|
||
means suspend autoselection."
|
||
;; Record values for MOUSE-POSITION, WINDOW, and SUSPEND.
|
||
(setq mouse-autoselect-window-position mouse-position)
|
||
(when window (setq mouse-autoselect-window-window window))
|
||
(setq mouse-autoselect-window-state (when suspend 'suspend))
|
||
;; Install timer which runs `mouse-autoselect-window-select' after
|
||
;; `mouse-autoselect-window' seconds.
|
||
(setq mouse-autoselect-window-timer
|
||
(run-at-time
|
||
(abs mouse-autoselect-window) nil 'mouse-autoselect-window-select)))
|
||
|
||
(defun mouse-autoselect-window-select ()
|
||
"Select window with delayed window autoselection.
|
||
If the mouse position has stabilized in a non-selected window, select
|
||
that window. The minibuffer window is selected only if the minibuffer is
|
||
active. This function is run by `mouse-autoselect-window-timer'."
|
||
(condition-case nil
|
||
(let* ((mouse-position (mouse-position))
|
||
(window
|
||
(condition-case nil
|
||
(window-at (cadr mouse-position) (cddr mouse-position)
|
||
(car mouse-position))
|
||
(error nil))))
|
||
(cond
|
||
((or (menu-or-popup-active-p)
|
||
(and window
|
||
(not (coordinates-in-window-p (cdr mouse-position) window))))
|
||
;; A menu / popup dialog is active or the mouse is on the scroll-bar
|
||
;; of WINDOW, temporarily suspend delayed autoselection.
|
||
(mouse-autoselect-window-start mouse-position nil t))
|
||
((eq mouse-autoselect-window-state 'suspend)
|
||
;; Delayed autoselection was temporarily suspended, reenable it.
|
||
(mouse-autoselect-window-start mouse-position))
|
||
((and window (not (eq window (selected-window)))
|
||
(or (not (numberp mouse-autoselect-window))
|
||
(and (> mouse-autoselect-window 0)
|
||
;; If `mouse-autoselect-window' is positive, select
|
||
;; window if the window is the same as before.
|
||
(eq window mouse-autoselect-window-window))
|
||
;; Otherwise select window if the mouse is at the same
|
||
;; position as before. Observe that the first test after
|
||
;; starting autoselection usually fails since the value of
|
||
;; `mouse-autoselect-window-position' recorded there is the
|
||
;; position where the mouse has entered the new window and
|
||
;; not necessarily where the mouse has stopped moving.
|
||
(equal mouse-position mouse-autoselect-window-position))
|
||
;; The minibuffer is a candidate window if it's active.
|
||
(or (not (window-minibuffer-p window))
|
||
(eq window (active-minibuffer-window))))
|
||
;; Mouse position has stabilized in non-selected window: Cancel
|
||
;; delayed autoselection and try to select that window.
|
||
(mouse-autoselect-window-cancel t)
|
||
;; Select window where mouse appears unless the selected window is the
|
||
;; minibuffer. Use `unread-command-events' in order to execute pre-
|
||
;; and post-command hooks and trigger idle timers. To avoid delaying
|
||
;; autoselection again, set `mouse-autoselect-window-state'."
|
||
(unless (window-minibuffer-p (selected-window))
|
||
(setq mouse-autoselect-window-state 'select)
|
||
(setq unread-command-events
|
||
(cons (list 'select-window (list window))
|
||
unread-command-events))))
|
||
((or (and window (eq window (selected-window)))
|
||
(not (numberp mouse-autoselect-window))
|
||
(equal mouse-position mouse-autoselect-window-position))
|
||
;; Mouse position has either stabilized in the selected window or at
|
||
;; `mouse-autoselect-window-position': Cancel delayed autoselection.
|
||
(mouse-autoselect-window-cancel t))
|
||
(t
|
||
;; Mouse position has not stabilized yet, resume delayed
|
||
;; autoselection.
|
||
(mouse-autoselect-window-start mouse-position window))))
|
||
(error nil)))
|
||
|
||
(defun handle-select-window (event)
|
||
"Handle select-window events."
|
||
(interactive "e")
|
||
(let ((window (posn-window (event-start event))))
|
||
(unless (or (not (window-live-p window))
|
||
;; Don't switch if we're currently in the minibuffer.
|
||
;; This tries to work around problems where the
|
||
;; minibuffer gets unselected unexpectedly, and where
|
||
;; you then have to move your mouse all the way down to
|
||
;; the minibuffer to select it.
|
||
(window-minibuffer-p (selected-window))
|
||
;; Don't switch to minibuffer window unless it's active.
|
||
(and (window-minibuffer-p window)
|
||
(not (minibuffer-window-active-p window)))
|
||
;; Don't switch when autoselection shall be delayed.
|
||
(and (numberp mouse-autoselect-window)
|
||
(not (zerop mouse-autoselect-window))
|
||
(not (eq mouse-autoselect-window-state 'select))
|
||
(progn
|
||
;; Cancel any delayed autoselection.
|
||
(mouse-autoselect-window-cancel t)
|
||
;; Start delayed autoselection from current mouse
|
||
;; position and window.
|
||
(mouse-autoselect-window-start (mouse-position) window)
|
||
;; Executing a command cancels delayed autoselection.
|
||
(add-hook
|
||
'pre-command-hook 'mouse-autoselect-window-cancel))))
|
||
(when mouse-autoselect-window
|
||
;; Reset state of delayed autoselection.
|
||
(setq mouse-autoselect-window-state nil)
|
||
;; Run `mouse-leave-buffer-hook' when autoselecting window.
|
||
(run-hooks 'mouse-leave-buffer-hook))
|
||
(select-window window))))
|
||
|
||
(defun delete-other-windows-vertically (&optional window)
|
||
"Delete the windows in the same column with WINDOW, but not WINDOW itself.
|
||
This may be a useful alternative binding for \\[delete-other-windows]
|
||
if you often split windows horizontally."
|
||
(interactive)
|
||
(let* ((window (or window (selected-window)))
|
||
(edges (window-edges window))
|
||
(w window) delenda)
|
||
(while (not (eq (setq w (next-window w 1)) window))
|
||
(let ((e (window-edges w)))
|
||
(when (and (= (car e) (car edges))
|
||
(= (caddr e) (caddr edges)))
|
||
(push w delenda))))
|
||
(mapc 'delete-window delenda)))
|
||
|
||
(defun truncated-partial-width-window-p (&optional window)
|
||
"Non-nil if lines in WINDOW are specifically truncated due to its width.
|
||
This returns nil if WINDOW is not a partial-width window
|
||
(regardless of the value of `truncate-lines').
|
||
Otherwise, consult the value of `truncate-partial-width-windows'
|
||
for the buffer shown in WINDOW.
|
||
If WINDOW is nil, use the selected window."
|
||
(unless window
|
||
(setq window (selected-window)))
|
||
(unless (window-full-width-p window)
|
||
(let ((t-p-w-w (buffer-local-value 'truncate-partial-width-windows
|
||
(window-buffer window))))
|
||
(if (integerp t-p-w-w)
|
||
(< (window-width window) t-p-w-w)
|
||
t-p-w-w))))
|
||
|
||
(define-key ctl-x-map "2" 'split-window-vertically)
|
||
(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)
|
||
(define-key ctl-x-4-map "0" 'kill-buffer-and-window)
|
||
|
||
;; arch-tag: b508dfcc-c353-4c37-89fa-e773fe10cea9
|
||
;;; window.el ends here
|