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window.el
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;;; window.el --- GNU Emacs window commands aside from those written in C
;; Copyright (C) 1985, 1989, 1992-1994, 2000-2016 Free Software
;; Foundation, Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Window tree functions.
;;; Code:
(defun internal--before-save-selected-window ()
(cons (selected-window)
;; We save and restore all frames' selected windows, because
;; `select-window' can change the frame-selected-window of
;; whatever frame that window is in. Each text terminal's
;; top-frame is preserved by putting it last in the list.
(apply #'append
(mapcar (lambda (terminal)
(let ((frames (frames-on-display-list terminal))
(top-frame (tty-top-frame terminal))
alist)
(if top-frame
(setq frames
(cons top-frame
(delq top-frame frames))))
(dolist (f frames)
(push (cons f (frame-selected-window f))
alist))
alist))
(terminal-list)))))
(defun internal--after-save-selected-window (state)
(dolist (elt (cdr state))
(and (frame-live-p (car elt))
(window-live-p (cdr elt))
(set-frame-selected-window (car elt) (cdr elt) 'norecord)))
(when (window-live-p (car state))
(select-window (car state) 'norecord)))
(defmacro save-selected-window (&rest body)
"Execute BODY, then select the previously selected window.
The value returned is the value of the last form in BODY.
This macro saves and restores the selected window, as well as the
selected window in each frame. If the previously selected window
is no longer live, then whatever window is selected at the end of
BODY remains selected. If the previously selected window of some
frame is no longer live at the end of BODY, that frame's selected
window is left alone.
This macro saves and restores the current buffer, since otherwise
its normal operation could make a different buffer current. The
order of recently selected windows and the buffer list ordering
are not altered by this macro (unless they are altered in BODY)."
(declare (indent 0) (debug t))
`(let ((save-selected-window--state (internal--before-save-selected-window)))
(save-current-buffer
(unwind-protect
(progn ,@body)
(internal--after-save-selected-window save-selected-window--state)))))
(defvar temp-buffer-window-setup-hook nil
"Normal hook run by `with-temp-buffer-window' before buffer display.
This hook is run by `with-temp-buffer-window' with the buffer to be
displayed current.")
(defvar temp-buffer-window-show-hook nil
"Normal hook run by `with-temp-buffer-window' after buffer display.
This hook is run by `with-temp-buffer-window' with the buffer
displayed and current and its window selected.")
(defun temp-buffer-window-setup (buffer-or-name)
"Set up temporary buffer specified by BUFFER-OR-NAME.
Return the buffer."
(let ((old-dir default-directory)
(buffer (get-buffer-create buffer-or-name)))
(with-current-buffer buffer
(kill-all-local-variables)
(setq default-directory old-dir)
(delete-all-overlays)
(setq buffer-read-only nil)
(setq buffer-file-name nil)
(setq buffer-undo-list t)
(let ((inhibit-read-only t)
(inhibit-modification-hooks t))
(erase-buffer)
(run-hooks 'temp-buffer-window-setup-hook))
;; Return the buffer.
buffer)))
(defun temp-buffer-window-show (buffer &optional action)
"Show temporary buffer BUFFER in a window.
Return the window showing BUFFER. Pass ACTION as action argument
to `display-buffer'."
(let (window frame)
(with-current-buffer buffer
(set-buffer-modified-p nil)
(setq buffer-read-only t)
(goto-char (point-min))
(when (let ((window-combination-limit
;; When `window-combination-limit' equals
;; `temp-buffer' or `temp-buffer-resize' and
;; `temp-buffer-resize-mode' is enabled in this
;; buffer bind it to t so resizing steals space
;; preferably from the window that was split.
(if (or (eq window-combination-limit 'temp-buffer)
(and (eq window-combination-limit
'temp-buffer-resize)
temp-buffer-resize-mode))
t
window-combination-limit)))
(setq window (display-buffer buffer action)))
(setq frame (window-frame window))
(unless (eq frame (selected-frame))
(raise-frame frame))
(setq minibuffer-scroll-window window)
(set-window-hscroll window 0)
(with-selected-window window
(run-hooks 'temp-buffer-window-show-hook)
(when temp-buffer-resize-mode
(resize-temp-buffer-window window)))
;; Return the window.
window))))
(defmacro with-temp-buffer-window (buffer-or-name action quit-function &rest body)
"Bind `standard-output' to BUFFER-OR-NAME, eval BODY, show the buffer.
BUFFER-OR-NAME must specify either a live buffer, or the name of
a buffer (if it does not exist, this macro creates it).
Make the buffer specified by BUFFER-OR-NAME empty before running
BODY and bind `standard-output' to that buffer, so that output
generated with `prin1' and similar functions in BODY goes into
that buffer. Do not make that buffer current for running the
forms in BODY. Use `with-current-buffer-window' instead if you
need to run BODY with that buffer current.
At the end of BODY, mark the specified buffer unmodified and
read-only, and display it in a window (but do not select it).
The display happens by calling `display-buffer' passing it the
ACTION argument. If `temp-buffer-resize-mode' is enabled, the
corresponding window may be resized automatically.
Return the value returned by BODY, unless QUIT-FUNCTION specifies
a function. In that case, run that function with two arguments -
the window showing the specified buffer and the value returned by
BODY - and return the value returned by that function.
If the buffer is displayed on a new frame, the window manager may
decide to select that frame. In that case, it's usually a good
strategy if QUIT-FUNCTION selects the window showing the buffer
before reading any value from the minibuffer; for example, when
asking a `yes-or-no-p' question.
This runs the hook `temp-buffer-window-setup-hook' before BODY,
with the specified buffer temporarily current. It runs the hook
`temp-buffer-window-show-hook' after displaying the buffer, with
that buffer temporarily current, and the window that was used to
display it temporarily selected.
This construct is similar to `with-output-to-temp-buffer' but,
neither runs `temp-buffer-setup-hook' which usually puts the
buffer in Help mode, nor `temp-buffer-show-function' (the ACTION
argument replaces this)."
(declare (debug t))
(let ((buffer (make-symbol "buffer"))
(window (make-symbol "window"))
(value (make-symbol "value")))
(macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
(vaction action)
(vquit-function quit-function))
`(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
(standard-output ,buffer)
,window ,value)
(setq ,value (progn ,@body))
(with-current-buffer ,buffer
(setq ,window (temp-buffer-window-show ,buffer ,vaction)))
(if (functionp ,vquit-function)
(funcall ,vquit-function ,window ,value)
,value)))))
(defmacro with-current-buffer-window (buffer-or-name action quit-function &rest body)
"Evaluate BODY with a buffer BUFFER-OR-NAME current and show that buffer.
This construct is like `with-temp-buffer-window' but unlike that
makes the buffer specified by BUFFER-OR-NAME current for running
BODY."
(declare (debug t))
(let ((buffer (make-symbol "buffer"))
(window (make-symbol "window"))
(value (make-symbol "value")))
(macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
(vaction action)
(vquit-function quit-function))
`(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
(standard-output ,buffer)
,window ,value)
(with-current-buffer ,buffer
(setq ,value (progn ,@body))
(setq ,window (temp-buffer-window-show ,buffer ,vaction)))
(if (functionp ,vquit-function)
(funcall ,vquit-function ,window ,value)
,value)))))
(defmacro with-displayed-buffer-window (buffer-or-name action quit-function &rest body)
"Show a buffer BUFFER-OR-NAME and evaluate BODY in that buffer.
This construct is like `with-current-buffer-window' but unlike that
displays the buffer specified by BUFFER-OR-NAME before running BODY."
(declare (debug t))
(let ((buffer (make-symbol "buffer"))
(window (make-symbol "window"))
(value (make-symbol "value")))
(macroexp-let2* nil ((vbuffer-or-name buffer-or-name)
(vaction action)
(vquit-function quit-function))
`(let* ((,buffer (temp-buffer-window-setup ,vbuffer-or-name))
(standard-output ,buffer)
,window ,value)
(with-current-buffer ,buffer
(setq ,window (temp-buffer-window-show
,buffer
;; Remove window-height when it's handled below.
(if (functionp (cdr (assq 'window-height (cdr ,vaction))))
(assq-delete-all 'window-height (copy-sequence ,vaction))
,vaction))))
(let ((inhibit-read-only t)
(inhibit-modification-hooks t))
(setq ,value (progn ,@body)))
(set-window-point ,window (point-min))
(when (functionp (cdr (assq 'window-height (cdr ,vaction))))
(ignore-errors
(funcall (cdr (assq 'window-height (cdr ,vaction))) ,window)))
(when (consp (cdr (assq 'preserve-size (cdr ,vaction))))
(window-preserve-size
,window t (cadr (assq 'preserve-size (cdr ,vaction))))
(window-preserve-size
,window nil (cddr (assq 'preserve-size (cdr ,vaction)))))
(if (functionp ,vquit-function)
(funcall ,vquit-function ,window ,value)
,value)))))
;; The following two functions are like `window-next-sibling' and
;; `window-prev-sibling' but the WINDOW argument is _not_ optional (so
;; they don't substitute the selected window for nil), and they return
;; nil when WINDOW doesn't have a parent (like a frame's root window or
;; a minibuffer window).
(defun window-right (window)
"Return WINDOW's right sibling.
Return nil if WINDOW is the root window of its frame. WINDOW can
be any window."
(and window (window-parent window) (window-next-sibling window)))
(defun window-left (window)
"Return WINDOW's left sibling.
Return nil if WINDOW is the root window of its frame. WINDOW can
be any window."
(and window (window-parent window) (window-prev-sibling window)))
(defun window-child (window)
"Return WINDOW's first child window.
WINDOW can be any window."
(or (window-top-child window) (window-left-child window)))
(defun window-child-count (window)
"Return number of WINDOW's child windows.
WINDOW can be any window."
(let ((count 0))
(when (and (windowp window) (setq window (window-child window)))
(while window
(setq count (1+ count))
(setq window (window-next-sibling window))))
count))
(defun window-last-child (window)
"Return last child window of WINDOW.
WINDOW can be any window."
(when (and (windowp window) (setq window (window-child window)))
(while (window-next-sibling window)
(setq window (window-next-sibling window))))
window)
(defun window-normalize-buffer (buffer-or-name)
"Return buffer specified by BUFFER-OR-NAME.
BUFFER-OR-NAME must be either a buffer or a string naming a live
buffer and defaults to the current buffer."
(cond
((not buffer-or-name)
(current-buffer))
((bufferp buffer-or-name)
(if (buffer-live-p buffer-or-name)
buffer-or-name
(error "Buffer %s is not a live buffer" buffer-or-name)))
((get-buffer buffer-or-name))
(t
(error "No such buffer %s" buffer-or-name))))
(defun window-normalize-frame (frame)
"Return frame specified by FRAME.
FRAME must be a live frame and defaults to the selected frame."
(if frame
(if (frame-live-p frame)
frame
(error "%s is not a live frame" frame))
(selected-frame)))
(defun window-normalize-window (window &optional live-only)
"Return the window specified by WINDOW.
If WINDOW is nil, return the selected window. Otherwise, if
WINDOW is a live or an internal window, return WINDOW; if
LIVE-ONLY is non-nil, return WINDOW for a live window only.
Otherwise, signal an error."
(cond
((null window)
(selected-window))
(live-only
(if (window-live-p window)
window
(error "%s is not a live window" window)))
((window-valid-p window)
window)
(t
(error "%s is not a valid window" window))))
;; Maybe this should go to frame.el.
(defun frame-char-size (&optional window-or-frame horizontal)
"Return the value of `frame-char-height' for WINDOW-OR-FRAME.
If WINDOW-OR-FRAME is a live frame, return the value of
`frame-char-height' for that frame. If WINDOW-OR-FRAME is a
valid window, return the value of `frame-char-height' for that
window's frame. In any other case, return the value of
`frame-char-height' for the selected frame.
Optional argument HORIZONTAL non-nil means to return the value of
`frame-char-width' for WINDOW-OR-FRAME."
(let ((frame
(cond
((window-valid-p window-or-frame)
(window-frame window-or-frame))
((frame-live-p window-or-frame)
window-or-frame)
(t (selected-frame)))))
(if horizontal
(frame-char-width frame)
(frame-char-height frame))))
(defvar ignore-window-parameters nil
"If non-nil, standard functions ignore window parameters.
The functions currently affected by this are `split-window',
`delete-window', `delete-other-windows' and `other-window'.
An application may bind this to a non-nil value around calls to
these functions to inhibit processing of window parameters.")
;; This must go to C, finally (or get removed).
(defconst window-safe-min-height 1
"The absolute minimum number of lines of any window.
Anything less might crash Emacs.")
(defun window-safe-min-pixel-height (&optional window)
"Return the absolute minimum pixel height of WINDOW."
(* window-safe-min-height
(frame-char-size (window-normalize-window window))))
(defcustom window-min-height 4
"The minimum total height, in lines, of any window.
The value has to accommodate one text line, a mode and header
line, a horizontal scroll bar and a bottom divider, if present.
A value less than `window-safe-min-height' is ignored. The value
of this variable is honored when windows are resized or split.
Applications should never rebind this variable. To resize a
window to a height less than the one specified here, an
application should instead call `window-resize' with a non-nil
IGNORE argument. In order to have `split-window' make a window
shorter, explicitly specify the SIZE argument of that function."
:type 'integer
:version "24.1"
:group 'windows)
(defun window-min-pixel-height (&optional window)
"Return the minimum pixel height of window WINDOW."
(* (max window-min-height window-safe-min-height)
(frame-char-size window)))
;; This must go to C, finally (or get removed).
(defconst window-safe-min-width 2
"The absolute minimum number of columns of a window.
Anything less might crash Emacs.")
(defun window-safe-min-pixel-width (&optional window)
"Return the absolute minimum pixel width of WINDOW."
(* window-safe-min-width
(frame-char-size (window-normalize-window window) t)))
(defcustom window-min-width 10
"The minimum total width, in columns, of any window.
The value has to accommodate two text columns as well as margins,
fringes, a scroll bar and a right divider, if present. A value
less than `window-safe-min-width' is ignored. The value of this
variable is honored when windows are resized or split.
Applications should never rebind this variable. To resize a
window to a width less than the one specified here, an
application should instead call `window-resize' with a non-nil
IGNORE argument. In order to have `split-window' make a window
narrower, explicitly specify the SIZE argument of that function."
:type 'integer
:version "24.1"
:group 'windows)
(defun window-min-pixel-width (&optional window)
"Return the minimum pixel width of window WINDOW."
(* (max window-min-width window-safe-min-width)
(frame-char-size window t)))
(defun window-safe-min-pixel-size (&optional window horizontal)
"Return the absolute minimum pixel height of WINDOW.
Optional argument HORIZONTAL non-nil means return the absolute
minimum pixel width of WINDOW."
(if horizontal
(window-safe-min-pixel-width window)
(window-safe-min-pixel-height window)))
(defun window-min-pixel-size (&optional window horizontal)
"Return the minimum pixel height of WINDOW.
Optional argument HORIZONTAL non-nil means return the minimum
pixel width of WINDOW."
(if horizontal
(window-min-pixel-width window)
(window-min-pixel-height window)))
(defun window-combined-p (&optional window horizontal)
"Return non-nil if WINDOW has siblings in a given direction.
WINDOW must be a valid window and defaults to the selected one.
HORIZONTAL determines a direction for the window combination. If
HORIZONTAL is omitted or nil, return non-nil if WINDOW is part of
a vertical window combination. If HORIZONTAL is non-nil, return
non-nil if WINDOW is part of a horizontal window combination."
(setq window (window-normalize-window window))
(let ((parent (window-parent window)))
(and parent
(if horizontal
(window-left-child parent)
(window-top-child parent)))))
(defun window-combination-p (&optional window horizontal)
"Return WINDOW's first child if WINDOW is a vertical combination.
WINDOW can be any window and defaults to the selected one.
Optional argument HORIZONTAL non-nil means return WINDOW's first
child if WINDOW is a horizontal combination."
(setq window (window-normalize-window window))
(if horizontal
(window-left-child window)
(window-top-child window)))
(defun window-combinations (window &optional horizontal)
"Return largest number of windows vertically arranged within WINDOW.
WINDOW must be a valid window and defaults to the selected one.
If HORIZONTAL is non-nil, return the largest number of
windows horizontally arranged within WINDOW."
(setq window (window-normalize-window window))
(cond
((window-live-p window)
;; If WINDOW is live, return 1.
1)
((if horizontal
(window-left-child window)
(window-top-child window))
;; If WINDOW is iso-combined, return the sum of the values for all
;; child windows of WINDOW.
(let ((child (window-child window))
(count 0))
(while child
(setq count
(+ (window-combinations child horizontal)
count))
(setq child (window-right child)))
count))
(t
;; If WINDOW is not iso-combined, return the maximum value of any
;; child window of WINDOW.
(let ((child (window-child window))
(count 1))
(while child
(setq count
(max (window-combinations child horizontal)
count))
(setq child (window-right child)))
count))))
(defun walk-window-tree-1 (fun walk-window-tree-window any &optional sub-only)
"Helper function for `walk-window-tree' and `walk-window-subtree'."
(let (walk-window-tree-buffer)
(while walk-window-tree-window
(setq walk-window-tree-buffer
(window-buffer walk-window-tree-window))
(when (or walk-window-tree-buffer any)
(funcall fun walk-window-tree-window))
(unless walk-window-tree-buffer
(walk-window-tree-1
fun (window-left-child walk-window-tree-window) any)
(walk-window-tree-1
fun (window-top-child walk-window-tree-window) any))
(if sub-only
(setq walk-window-tree-window nil)
(setq walk-window-tree-window
(window-right walk-window-tree-window))))))
(defun walk-window-tree (fun &optional frame any minibuf)
"Run function FUN on each live window of FRAME.
FUN must be a function with one argument - a window. FRAME must
be a live frame and defaults to the selected one. ANY, if
non-nil, means to run FUN on all live and internal windows of
FRAME.
Optional argument MINIBUF t means run FUN on FRAME's minibuffer
window even if it isn't active. MINIBUF nil or omitted means run
FUN on FRAME's minibuffer window only if it's active. In both
cases the minibuffer window must be part of FRAME. MINIBUF
neither nil nor t means never run FUN on the minibuffer window.
This function performs a pre-order, depth-first traversal of the
window tree. If FUN changes the window tree, the result is
unpredictable."
(setq frame (window-normalize-frame frame))
(walk-window-tree-1 fun (frame-root-window frame) any)
(when (memq minibuf '(nil t))
;; Run FUN on FRAME's minibuffer window if requested.
(let ((minibuffer-window (minibuffer-window frame)))
(when (and (window-live-p minibuffer-window)
(eq (window-frame minibuffer-window) frame)
(or (eq minibuf t)
(minibuffer-window-active-p minibuffer-window)))
(funcall fun minibuffer-window)))))
(defun walk-window-subtree (fun &optional window any)
"Run function FUN on the subtree of windows rooted at WINDOW.
WINDOW defaults to the selected window. FUN must be a function
with one argument - a window. By default, run FUN only on live
windows of the subtree. If the optional argument ANY is non-nil,
run FUN on all live and internal windows of the subtree. If
WINDOW is live, run FUN on WINDOW only.
This function performs a pre-order, depth-first traversal of the
subtree rooted at WINDOW. If FUN changes that tree, the result
is unpredictable."
(setq window (window-normalize-window window))
(walk-window-tree-1 fun window any t))
(defun window-with-parameter (parameter &optional value frame any minibuf)
"Return first window on FRAME with PARAMETER non-nil.
FRAME defaults to the selected frame. Optional argument VALUE
non-nil means only return a window whose window-parameter value
for PARAMETER equals VALUE (comparison is done with `equal').
Optional argument ANY non-nil means consider internal windows
too.
Optional argument MINIBUF t means consider FRAME's minibuffer
window even if it isn't active. MINIBUF nil or omitted means
consider FRAME's minibuffer window only if it's active. In both
cases the minibuffer window must be part of FRAME. MINIBUF
neither nil nor t means never consider the minibuffer window."
(let (this-value)
(catch 'found
(walk-window-tree
(lambda (window)
(when (and (setq this-value (window-parameter window parameter))
(or (not value) (equal value this-value)))
(throw 'found window)))
frame any minibuf))))
;;; Atomic windows.
(defun window-atom-root (&optional window)
"Return root of atomic window WINDOW is a part of.
WINDOW must be a valid window and defaults to the selected one.
Return nil if WINDOW is not part of an atomic window."
(setq window (window-normalize-window window))
(let (root)
(while (and window (window-parameter window 'window-atom))
(setq root window)
(setq window (window-parent window)))
root))
(defun window-make-atom (window)
"Make WINDOW an atomic window.
WINDOW must be an internal window. Return WINDOW."
(if (not (window-child window))
(error "Window %s is not an internal window" window)
(walk-window-subtree
(lambda (window)
(unless (window-parameter window 'window-atom)
(set-window-parameter window 'window-atom t)))
window t)
window))
(defun display-buffer-in-atom-window (buffer alist)
"Display BUFFER in an atomic window.
This function displays BUFFER in a new window that will be
combined with an existing window to form an atomic window. If
the existing window is already part of an atomic window, add the
new window to that atomic window. Operations like `split-window'
or `delete-window', when applied to a constituent of an atomic
window, are applied atomically to the root of that atomic window.
ALIST is an association list of symbols and values. The
following symbols can be used.
`window' specifies the existing window the new window shall be
combined with. Use `window-atom-root' to make the new window a
sibling of an atomic window's root. If an internal window is
specified here, all children of that window become part of the
atomic window too. If no window is specified, the new window
becomes a sibling of the selected window. By default, the
`window-atom' parameter of the existing window is set to `main'
provided it is live and was not set before.
`side' denotes the side of the existing window where the new
window shall be located. Valid values are `below', `right',
`above' and `left'. The default is `below'. By default, the
`window-atom' parameter of the new window is set to this value.
The return value is the new window, nil when creating that window
failed."
(let* ((ignore-window-parameters t)
(window-combination-limit t)
(window-combination-resize 'atom)
(window (cdr (assq 'window alist)))
(side (cdr (assq 'side alist)))
(atom (when window (window-parameter window 'window-atom)))
root new)
(setq window (window-normalize-window window))
(setq root (window-atom-root window))
;; Split off new window.
(when (setq new (split-window window nil side))
(window-make-atom
(if (and root (not (eq root window)))
;; When WINDOW was part of an atomic window and we did not
;; split its root, root atomic window at old root.
root
;; Otherwise, root atomic window at WINDOW's new parent.
(window-parent window)))
;; Assign `window-atom' parameters, if needed.
(when (and (not atom) (window-live-p window))
(set-window-parameter window 'window-atom 'main))
(set-window-parameter new 'window-atom side)
;; Display BUFFER in NEW and return NEW.
(window--display-buffer
buffer new 'window alist display-buffer-mark-dedicated))))
(defun window--atom-check-1 (window)
"Subroutine of `window--atom-check'."
(when window
(if (window-parameter window 'window-atom)
(let ((count 0))
(when (or (catch 'reset
(walk-window-subtree
(lambda (window)
(if (window-parameter window 'window-atom)
(setq count (1+ count))
(throw 'reset t)))
window t))
;; count >= 1 must hold here. If there's no other
;; window around dissolve this atomic window.
(= count 1))
;; Dissolve atomic window.
(walk-window-subtree
(lambda (window)
(set-window-parameter window 'window-atom nil))
window t)))
;; Check children.
(unless (window-buffer window)
(window--atom-check-1 (window-left-child window))
(window--atom-check-1 (window-top-child window))))
;; Check right sibling
(window--atom-check-1 (window-right window))))
(defun window--atom-check (&optional frame)
"Check atomicity of all windows on FRAME.
FRAME defaults to the selected frame. If an atomic window is
wrongly configured, reset the atomicity of all its windows on
FRAME to nil. An atomic window is wrongly configured if it has
no child windows or one of its child windows is not atomic."
(window--atom-check-1 (frame-root-window frame)))
;; Side windows.
(defvar window-sides '(left top right bottom)
"Window sides.")
(defcustom window-sides-vertical nil
"If non-nil, left and right side windows are full height.
Otherwise, top and bottom side windows are full width."
:type 'boolean
:group 'windows
:version "24.1")
(defcustom window-sides-slots '(nil nil nil nil)
"Maximum number of side window slots.
The value is a list of four elements specifying the number of
side window slots on (in this order) the left, top, right and
bottom side of each frame. If an element is a number, this means
to display at most that many side windows on the corresponding
side. If an element is nil, this means there's no bound on the
number of slots on that side."
:version "24.1"
:risky t
:type
'(list
:value (nil nil nil nil)
(choice
:tag "Left"
:help-echo "Maximum slots of left side window."
:value nil
:format "%[Left%] %v\n"
(const :tag "Unlimited" :format "%t" nil)
(integer :tag "Number" :value 2 :size 5))
(choice
:tag "Top"
:help-echo "Maximum slots of top side window."
:value nil
:format "%[Top%] %v\n"
(const :tag "Unlimited" :format "%t" nil)
(integer :tag "Number" :value 3 :size 5))
(choice
:tag "Right"
:help-echo "Maximum slots of right side window."
:value nil
:format "%[Right%] %v\n"
(const :tag "Unlimited" :format "%t" nil)
(integer :tag "Number" :value 2 :size 5))
(choice
:tag "Bottom"
:help-echo "Maximum slots of bottom side window."
:value nil
:format "%[Bottom%] %v\n"
(const :tag "Unlimited" :format "%t" nil)
(integer :tag "Number" :value 3 :size 5)))
:group 'windows)
(defun window--side-window-p (window)
"Return non-nil if WINDOW is a side window or the parent of one."
(or (window-parameter window 'window-side)
(and (window-child window)
(or (window-parameter
(window-child window) 'window-side)
(window-parameter
(window-last-child window) 'window-side)))))
(defun window--major-non-side-window (&optional frame)
"Return the major non-side window of frame FRAME.
The optional argument FRAME must be a live frame and defaults to
the selected one.
If FRAME has at least one side window, the major non-side window
is either an internal non-side window such that all other
non-side windows on FRAME descend from it, or the single live
non-side window of FRAME. If FRAME has no side windows, return
its root window."
(let ((frame (window-normalize-frame frame))
major sibling)
;; Set major to the _last_ window found by `walk-window-tree' that
;; is not a side window but has a side window as its sibling.
(walk-window-tree
(lambda (window)
(and (not (window-parameter window 'window-side))
(or (and (setq sibling (window-prev-sibling window))
(window-parameter sibling 'window-side))
(and (setq sibling (window-next-sibling window))
(window-parameter sibling 'window-side)))
(setq major window)))
frame t 'nomini)
(or major (frame-root-window frame))))
(defun window--major-side-window (side)
"Return major side window on SIDE.
SIDE must be one of the symbols `left', `top', `right' or
`bottom'. Return nil if no such window exists."
(let ((root (frame-root-window))
window)
;; (1) If a window on the opposite side exists, return that window's
;; sibling.
;; (2) If the new window shall span the entire side, return the
;; frame's root window.
;; (3) If a window on an orthogonal side exists, return that
;; window's sibling.
;; (4) Otherwise return the frame's root window.
(cond
((or (and (eq side 'left)
(setq window (window-with-parameter 'window-side 'right nil t)))
(and (eq side 'top)
(setq window (window-with-parameter 'window-side 'bottom nil t))))
(window-prev-sibling window))
((or (and (eq side 'right)
(setq window (window-with-parameter 'window-side 'left nil t)))
(and (eq side 'bottom)
(setq window (window-with-parameter 'window-side 'top nil t))))
(window-next-sibling window))
((memq side '(left right))
(cond
(window-sides-vertical
root)
((setq window (window-with-parameter 'window-side 'top nil t))
(window-next-sibling window))
((setq window (window-with-parameter 'window-side 'bottom nil t))
(window-prev-sibling window))
(t root)))
((memq side '(top bottom))
(cond
((not window-sides-vertical)
root)
((setq window (window-with-parameter 'window-side 'left nil t))
(window-next-sibling window))
((setq window (window-with-parameter 'window-side 'right nil t))
(window-prev-sibling window))
(t root))))))
(defun display-buffer-in-major-side-window (buffer side slot &optional alist)
"Display BUFFER in a new window on SIDE of the selected frame.
SIDE must be one of `left', `top', `right' or `bottom'. SLOT
specifies the slot to use. ALIST is an association list of
symbols and values as passed to `display-buffer-in-side-window'.
This function may be called only if no window on SIDE exists yet.
The new window automatically becomes the \"major\" side window on
SIDE. Return the new window, nil if its creation window failed."
(let* ((left-or-right (memq side '(left right)))
(major (window--major-side-window side))
(on-side (cond
((eq side 'top) 'above)
((eq side 'bottom) 'below)
(t side)))
;; The following two bindings will tell `split-window' to take
;; the space for the new window from `major' and not make a new
;; parent window unless needed.
(window-combination-resize 'side)
(window-combination-limit nil)
(new (split-window major nil on-side)))
(when new
;; Initialize `window-side' parameter of new window to SIDE.
(set-window-parameter new 'window-side side)
;; Install `window-slot' parameter of new window.
(set-window-parameter new 'window-slot slot)
;; Install `delete-window' parameter thus making sure that when
;; the new window is deleted, a side window on the opposite side
;; does not get resized.
(set-window-parameter new 'delete-window 'delete-side-window)
;; Auto-adjust height/width of new window unless a size has been
;; explicitly requested.
(unless (if left-or-right
(cdr (assq 'window-width alist))
(cdr (assq 'window-height alist)))
(setq alist
(cons
(cons
(if left-or-right 'window-width 'window-height)
(/ (window-total-size (frame-root-window) left-or-right)
;; By default use a fourth of the size of the frame's
;; root window.
4))
alist)))
;; Install BUFFER in new window and return NEW.
(window--display-buffer buffer new 'window alist 'side))))
(defun delete-side-window (window)
"Delete side window WINDOW."
(let ((window-combination-resize
(window-parameter (window-parent window) 'window-side))
(ignore-window-parameters t))
(delete-window window)))
(defun display-buffer-in-side-window (buffer alist)
"Display BUFFER in a side window of the selected frame.
ALIST is an association list of symbols and values. The
following special symbols can be used in ALIST.
`side' denotes the side of the frame where the new window shall
be located. Valid values are `bottom', `right', `top' and
`left'. The default is `bottom'.
`slot' if non-nil, specifies the window slot where to display
BUFFER. A value of zero or nil means use the middle slot on
the specified side. A negative value means use a slot
preceding (that is, above or on the left of) the middle slot.
A positive value means use a slot following (that is, below or
on the right of) the middle slot. The default is zero."
(let ((side (or (cdr (assq 'side alist)) 'bottom))
(slot (or (cdr (assq 'slot alist)) 0)))
(cond
((not (memq side '(top bottom left right)))
(error "Invalid side %s specified" side))
((not (numberp slot))
(error "Invalid slot %s specified" slot)))
(let* ((major (window-with-parameter 'window-side side nil t))
;; `major' is the major window on SIDE, `windows' the list of
;; life windows on SIDE.
(windows
(when major
(let (windows)
(walk-window-tree
(lambda (window)
(when (eq (window-parameter window 'window-side) side)
(setq windows (cons window windows))))
nil nil 'nomini)
(nreverse windows))))
(slots (when major (max 1 (window-child-count major))))
(max-slots
(nth (cond
((eq side 'left) 0)
((eq side 'top) 1)
((eq side 'right) 2)
((eq side 'bottom) 3))
window-sides-slots))
window this-window this-slot prev-window next-window
best-window best-slot abs-slot)
(cond
((and (numberp max-slots) (<= max-slots 0))
;; No side-slots available on this side. Don't create an error,
;; just return nil.
nil)
((not windows)
;; No major window exists on this side, make one.
(display-buffer-in-major-side-window buffer side slot alist))
(t
;; Scan windows on SIDE.
(catch 'found
(dolist (window windows)
(setq this-slot (window-parameter window 'window-slot))
(cond
;; The following should not happen and probably be checked
;; by window--side-check.
((not (numberp this-slot)))
((= this-slot slot)
;; A window with a matching slot has been found.
(setq this-window window)
(throw 'found t))
(t
;; Check if this window has a better slot value wrt the
;; slot of the window we want.
(setq abs-slot
(if (or (and (> this-slot 0) (> slot 0))
(and (< this-slot 0) (< slot 0)))
(abs (- slot this-slot))
(+ (abs slot) (abs this-slot))))
(unless (and best-slot (<= best-slot abs-slot))
(setq best-window window)
(setq best-slot abs-slot))
(cond
((<= this-slot slot)
(setq prev-window window))
((not next-window)
(setq next-window window)))))))
;; `this-window' is the first window with the same SLOT.
;; `prev-window' is the window with the largest slot < SLOT. A new
;; window will be created after it.
;; `next-window' is the window with the smallest slot > SLOT. A new
;; window will be created before it.
;; `best-window' is the window with the smallest absolute difference
;; of its slot and SLOT.
;; Note: We dedicate the window used softly to its buffer to
;; avoid that "other" (non-side) buffer display functions steal
;; it from us. This must eventually become customizable via
;; ALIST (or, better, avoided in the "other" functions).
(or (and this-window
;; Reuse `this-window'.
(window--display-buffer buffer this-window 'reuse alist 'side))
(and (or (not max-slots) (< slots max-slots))
(or (and next-window
;; Make new window before `next-window'.
(let ((next-side
(if (memq side '(left right)) 'above 'left))
(window-combination-resize 'side))
(setq window (split-window next-window nil next-side))