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1 | ;;; window.el --- GNU Emacs window commands aside from those written in C |
2 | ||
3 | ;; Copyright (C) 1985, 1989, 1992, 1993, 1994, 2000, 2001, 2002, | |
ae940284 | 4 | ;; 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
3c448ab6 MR |
5 | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: internal | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software: you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation, either version 3 of the License, or | |
14 | ;; (at your option) any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;; Window tree functions. | |
27 | ||
28 | ;;; Code: | |
29 | ||
30 | (eval-when-compile (require 'cl)) | |
31 | ||
32 | (defvar window-size-fixed nil | |
33 | "*Non-nil in a buffer means windows displaying the buffer are fixed-size. | |
34 | If the value is `height', then only the window's height is fixed. | |
35 | If the value is `width', then only the window's width is fixed. | |
36 | Any other non-nil value fixes both the width and the height. | |
37 | Emacs won't change the size of any window displaying that buffer, | |
38 | unless you explicitly change the size, or Emacs has no other choice.") | |
39 | (make-variable-buffer-local 'window-size-fixed) | |
40 | ||
41 | (defmacro save-selected-window (&rest body) | |
42 | "Execute BODY, then select the previously selected window. | |
43 | The value returned is the value of the last form in BODY. | |
44 | ||
45 | This macro saves and restores the selected window, as well as the | |
46 | selected window in each frame. If the previously selected window | |
47 | is no longer live, then whatever window is selected at the end of | |
48 | BODY remains selected. If the previously selected window of some | |
49 | frame is no longer live at the end of BODY, that frame's selected | |
50 | window is left alone. | |
51 | ||
52 | This macro saves and restores the current buffer, since otherwise | |
53 | its normal operation could make a different buffer current. The | |
54 | order of recently selected windows and the buffer list ordering | |
55 | are not altered by this macro (unless they are altered in BODY)." | |
56 | `(let ((save-selected-window-window (selected-window)) | |
57 | ;; It is necessary to save all of these, because calling | |
58 | ;; select-window changes frame-selected-window for whatever | |
59 | ;; frame that window is in. | |
60 | (save-selected-window-alist | |
61 | (mapcar (lambda (frame) (cons frame (frame-selected-window frame))) | |
62 | (frame-list)))) | |
63 | (save-current-buffer | |
64 | (unwind-protect | |
65 | (progn ,@body) | |
66 | (dolist (elt save-selected-window-alist) | |
67 | (and (frame-live-p (car elt)) | |
68 | (window-live-p (cdr elt)) | |
69 | (set-frame-selected-window (car elt) (cdr elt) 'norecord))) | |
70 | (when (window-live-p save-selected-window-window) | |
71 | (select-window save-selected-window-window 'norecord)))))) | |
72 | ||
73 | (defun window-body-height (&optional window) | |
74 | "Return number of lines in WINDOW available for actual buffer text. | |
75 | WINDOW defaults to the selected window. | |
76 | ||
77 | The return value does not include the mode line or the header | |
78 | line, if any. If a line at the bottom of the window is only | |
79 | partially visible, that line is included in the return value. If | |
80 | you do not want to include a partially visible bottom line in the | |
81 | return value, use `window-text-height' instead." | |
82 | (or window (setq window (selected-window))) | |
83 | (if (window-minibuffer-p window) | |
84 | (window-height window) | |
85 | (with-current-buffer (window-buffer window) | |
86 | (max 1 (- (window-height window) | |
87 | (if mode-line-format 1 0) | |
88 | (if header-line-format 1 0)))))) | |
89 | ||
ccafbf06 | 90 | ;; See discussion in bug#4543. |
02c6f098 | 91 | (defun window-full-height-p (&optional window) |
ccafbf06 GM |
92 | "Return non-nil if WINDOW is not the result of a vertical split. |
93 | WINDOW defaults to the selected window. (This function is not | |
94 | appropriate for minibuffers.)" | |
02c6f098 GM |
95 | (unless window |
96 | (setq window (selected-window))) | |
97 | (= (window-height window) | |
98 | (window-height (frame-root-window (window-frame window))))) | |
99 | ||
3c448ab6 MR |
100 | (defun one-window-p (&optional nomini all-frames) |
101 | "Return non-nil if the selected window is the only window. | |
102 | Optional arg NOMINI non-nil means don't count the minibuffer | |
103 | even if it is active. Otherwise, the minibuffer is counted | |
104 | when it is active. | |
105 | ||
106 | The optional arg ALL-FRAMES t means count windows on all frames. | |
107 | If it is `visible', count windows on all visible frames. | |
108 | ALL-FRAMES nil or omitted means count only the selected frame, | |
109 | plus the minibuffer it uses (which may be on another frame). | |
110 | ALL-FRAMES 0 means count all windows in all visible or iconified frames. | |
111 | If ALL-FRAMES is anything else, count only the selected frame." | |
112 | (let ((base-window (selected-window))) | |
113 | (if (and nomini (eq base-window (minibuffer-window))) | |
114 | (setq base-window (next-window base-window))) | |
115 | (eq base-window | |
116 | (next-window base-window (if nomini 'arg) all-frames)))) | |
117 | ||
118 | (defun window-current-scroll-bars (&optional window) | |
119 | "Return the current scroll bar settings for WINDOW. | |
120 | WINDOW defaults to the selected window. | |
121 | ||
122 | The return value is a cons cell (VERTICAL . HORIZONTAL) where | |
123 | VERTICAL specifies the current location of the vertical scroll | |
124 | bars (`left', `right', or nil), and HORIZONTAL specifies the | |
125 | current location of the horizontal scroll bars (`top', `bottom', | |
126 | or nil). | |
127 | ||
128 | Unlike `window-scroll-bars', this function reports the scroll bar | |
129 | type actually used, once frame defaults and `scroll-bar-mode' are | |
130 | taken into account." | |
131 | (let ((vert (nth 2 (window-scroll-bars window))) | |
132 | (hor nil)) | |
133 | (when (or (eq vert t) (eq hor t)) | |
134 | (let ((fcsb (frame-current-scroll-bars | |
135 | (window-frame (or window (selected-window)))))) | |
136 | (if (eq vert t) | |
137 | (setq vert (car fcsb))) | |
138 | (if (eq hor t) | |
139 | (setq hor (cdr fcsb))))) | |
140 | (cons vert hor))) | |
141 | ||
142 | (defun walk-windows (proc &optional minibuf all-frames) | |
143 | "Cycle through all windows, calling PROC for each one. | |
144 | PROC must specify a function with a window as its sole argument. | |
145 | The optional arguments MINIBUF and ALL-FRAMES specify the set of | |
146 | windows to include in the walk, see also `next-window'. | |
147 | ||
148 | MINIBUF t means include the minibuffer window even if the | |
149 | minibuffer is not active. MINIBUF nil or omitted means include | |
150 | the minibuffer window only if the minibuffer is active. Any | |
151 | other value means do not include the minibuffer window even if | |
152 | the minibuffer is active. | |
153 | ||
154 | Several frames may share a single minibuffer; if the minibuffer | |
155 | is active, all windows on all frames that share that minibuffer | |
156 | are included too. Therefore, if you are using a separate | |
157 | minibuffer frame and the minibuffer is active and MINIBUF says it | |
158 | counts, `walk-windows' includes the windows in the frame from | |
159 | which you entered the minibuffer, as well as the minibuffer | |
160 | window. | |
161 | ||
162 | ALL-FRAMES nil or omitted means cycle through all windows on | |
163 | WINDOW's frame, plus the minibuffer window if specified by the | |
164 | MINIBUF argument, see above. If the minibuffer counts, cycle | |
165 | through all windows on all frames that share that minibuffer | |
166 | too. | |
167 | ALL-FRAMES t means cycle through all windows on all existing | |
168 | frames. | |
169 | ALL-FRAMES `visible' means cycle through all windows on all | |
170 | visible frames. | |
171 | ALL-FRAMES 0 means cycle through all windows on all visible and | |
172 | iconified frames. | |
173 | ALL-FRAMES a frame means cycle through all windows on that frame | |
174 | only. | |
175 | Anything else means cycle through all windows on WINDOW's frame | |
176 | and no others. | |
177 | ||
178 | This function changes neither the order of recently selected | |
179 | windows nor the buffer list." | |
180 | ;; If we start from the minibuffer window, don't fail to come | |
181 | ;; back to it. | |
182 | (when (window-minibuffer-p (selected-window)) | |
183 | (setq minibuf t)) | |
184 | ;; Make sure to not mess up the order of recently selected | |
185 | ;; windows. Use `save-selected-window' and `select-window' | |
186 | ;; with second argument non-nil for this purpose. | |
187 | (save-selected-window | |
188 | (when (framep all-frames) | |
189 | (select-window (frame-first-window all-frames) 'norecord)) | |
190 | (let* (walk-windows-already-seen | |
191 | (walk-windows-current (selected-window))) | |
192 | (while (progn | |
193 | (setq walk-windows-current | |
194 | (next-window walk-windows-current minibuf all-frames)) | |
195 | (not (memq walk-windows-current walk-windows-already-seen))) | |
196 | (setq walk-windows-already-seen | |
197 | (cons walk-windows-current walk-windows-already-seen)) | |
198 | (funcall proc walk-windows-current))))) | |
199 | ||
200 | (defun get-window-with-predicate (predicate &optional minibuf | |
201 | all-frames default) | |
202 | "Return a window satisfying PREDICATE. | |
203 | More precisely, cycle through all windows using `walk-windows', | |
204 | calling the function PREDICATE on each one of them with the | |
205 | window as its sole argument. Return the first window for which | |
206 | PREDICATE returns non-nil. If no window satisfies PREDICATE, | |
207 | return DEFAULT. | |
208 | ||
209 | The optional arguments MINIBUF and ALL-FRAMES specify the set of | |
210 | windows to include. See `walk-windows' for the meaning of these | |
211 | arguments." | |
212 | (catch 'found | |
213 | (walk-windows #'(lambda (window) | |
214 | (when (funcall predicate window) | |
215 | (throw 'found window))) | |
216 | minibuf all-frames) | |
217 | default)) | |
218 | ||
219 | (defalias 'some-window 'get-window-with-predicate) | |
220 | ||
221 | ;; This should probably be written in C (i.e., without using `walk-windows'). | |
222 | (defun get-buffer-window-list (&optional buffer-or-name minibuf all-frames) | |
223 | "Return list of all windows displaying BUFFER-OR-NAME, or nil if none. | |
224 | BUFFER-OR-NAME may be a buffer or the name of an existing buffer | |
225 | and defaults to the current buffer. | |
226 | ||
227 | The optional arguments MINIBUF and ALL-FRAMES specify the set of | |
228 | windows to consider. See `walk-windows' for the precise meaning | |
229 | of these arguments." | |
230 | (let ((buffer (cond | |
231 | ((not buffer-or-name) (current-buffer)) | |
232 | ((bufferp buffer-or-name) buffer-or-name) | |
233 | (t (get-buffer buffer-or-name)))) | |
234 | windows) | |
235 | (walk-windows (function (lambda (window) | |
236 | (if (eq (window-buffer window) buffer) | |
237 | (setq windows (cons window windows))))) | |
238 | minibuf all-frames) | |
239 | windows)) | |
240 | ||
241 | (defun minibuffer-window-active-p (window) | |
242 | "Return t if WINDOW is the currently active minibuffer window." | |
243 | (eq window (active-minibuffer-window))) | |
244 | \f | |
245 | (defun count-windows (&optional minibuf) | |
246 | "Return the number of visible windows. | |
247 | The optional argument MINIBUF specifies whether the minibuffer | |
248 | window shall be counted. See `walk-windows' for the precise | |
249 | meaning of this argument." | |
250 | (let ((count 0)) | |
251 | (walk-windows (lambda (w) (setq count (+ count 1))) | |
252 | minibuf) | |
253 | count)) | |
254 | \f | |
255 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
256 | ;;; `balance-windows' subroutines using `window-tree' | |
257 | ||
258 | ;;; Translate from internal window tree format | |
259 | ||
260 | (defun bw-get-tree (&optional window-or-frame) | |
261 | "Get a window split tree in our format. | |
262 | ||
263 | WINDOW-OR-FRAME must be nil, a frame, or a window. If it is nil, | |
264 | then the whole window split tree for `selected-frame' is returned. | |
265 | If it is a frame, then this is used instead. If it is a window, | |
266 | then the smallest tree containing that window is returned." | |
267 | (when window-or-frame | |
268 | (unless (or (framep window-or-frame) | |
269 | (windowp window-or-frame)) | |
270 | (error "Not a frame or window: %s" window-or-frame))) | |
271 | (let ((subtree (bw-find-tree-sub window-or-frame))) | |
272 | (when subtree | |
273 | (if (integerp subtree) | |
274 | nil | |
275 | (bw-get-tree-1 subtree))))) | |
276 | ||
277 | (defun bw-get-tree-1 (split) | |
278 | (if (windowp split) | |
279 | split | |
280 | (let ((dir (car split)) | |
281 | (edges (car (cdr split))) | |
282 | (childs (cdr (cdr split)))) | |
283 | (list | |
284 | (cons 'dir (if dir 'ver 'hor)) | |
285 | (cons 'b (nth 3 edges)) | |
286 | (cons 'r (nth 2 edges)) | |
287 | (cons 't (nth 1 edges)) | |
288 | (cons 'l (nth 0 edges)) | |
289 | (cons 'childs (mapcar #'bw-get-tree-1 childs)))))) | |
290 | ||
291 | (defun bw-find-tree-sub (window-or-frame &optional get-parent) | |
292 | (let* ((window (when (windowp window-or-frame) window-or-frame)) | |
293 | (frame (when (windowp window) (window-frame window))) | |
294 | (wt (car (window-tree frame)))) | |
295 | (when (< 1 (length (window-list frame 0))) | |
296 | (if window | |
297 | (bw-find-tree-sub-1 wt window get-parent) | |
298 | wt)))) | |
299 | ||
300 | (defun bw-find-tree-sub-1 (tree win &optional get-parent) | |
301 | (unless (windowp win) (error "Not a window: %s" win)) | |
302 | (if (memq win tree) | |
303 | (if get-parent | |
304 | get-parent | |
305 | tree) | |
306 | (let ((childs (cdr (cdr tree))) | |
307 | child | |
308 | subtree) | |
309 | (while (and childs (not subtree)) | |
310 | (setq child (car childs)) | |
311 | (setq childs (cdr childs)) | |
312 | (when (and child (listp child)) | |
313 | (setq subtree (bw-find-tree-sub-1 child win get-parent)))) | |
314 | (if (integerp subtree) | |
315 | (progn | |
316 | (if (= 1 subtree) | |
317 | tree | |
318 | (1- subtree))) | |
319 | subtree | |
320 | )))) | |
321 | ||
322 | ;;; Window or object edges | |
323 | ||
324 | (defun bw-l (obj) | |
325 | "Left edge of OBJ." | |
326 | (if (windowp obj) (nth 0 (window-edges obj)) (cdr (assq 'l obj)))) | |
327 | (defun bw-t (obj) | |
328 | "Top edge of OBJ." | |
329 | (if (windowp obj) (nth 1 (window-edges obj)) (cdr (assq 't obj)))) | |
330 | (defun bw-r (obj) | |
331 | "Right edge of OBJ." | |
332 | (if (windowp obj) (nth 2 (window-edges obj)) (cdr (assq 'r obj)))) | |
333 | (defun bw-b (obj) | |
334 | "Bottom edge of OBJ." | |
335 | (if (windowp obj) (nth 3 (window-edges obj)) (cdr (assq 'b obj)))) | |
336 | ||
337 | ;;; Split directions | |
338 | ||
339 | (defun bw-dir (obj) | |
340 | "Return window split tree direction if OBJ. | |
341 | If OBJ is a window return 'both. If it is a window split tree | |
342 | then return its direction." | |
343 | (if (symbolp obj) | |
344 | obj | |
345 | (if (windowp obj) | |
346 | 'both | |
347 | (let ((dir (cdr (assq 'dir obj)))) | |
348 | (unless (memq dir '(hor ver both)) | |
349 | (error "Can't find dir in %s" obj)) | |
350 | dir)))) | |
351 | ||
352 | (defun bw-eqdir (obj1 obj2) | |
353 | "Return t if window split tree directions are equal. | |
354 | OBJ1 and OBJ2 should be either windows or window split trees in | |
355 | our format. The directions returned by `bw-dir' are compared and | |
356 | t is returned if they are `eq' or one of them is 'both." | |
357 | (let ((dir1 (bw-dir obj1)) | |
358 | (dir2 (bw-dir obj2))) | |
359 | (or (eq dir1 dir2) | |
360 | (eq dir1 'both) | |
361 | (eq dir2 'both)))) | |
362 | ||
363 | ;;; Building split tree | |
364 | ||
365 | (defun bw-refresh-edges (obj) | |
366 | "Refresh the edge information of OBJ and return OBJ." | |
367 | (unless (windowp obj) | |
368 | (let ((childs (cdr (assq 'childs obj))) | |
369 | (ol 1000) | |
370 | (ot 1000) | |
371 | (or -1) | |
372 | (ob -1)) | |
373 | (dolist (o childs) | |
374 | (when (> ol (bw-l o)) (setq ol (bw-l o))) | |
375 | (when (> ot (bw-t o)) (setq ot (bw-t o))) | |
376 | (when (< or (bw-r o)) (setq or (bw-r o))) | |
377 | (when (< ob (bw-b o)) (setq ob (bw-b o)))) | |
378 | (setq obj (delq 'l obj)) | |
379 | (setq obj (delq 't obj)) | |
380 | (setq obj (delq 'r obj)) | |
381 | (setq obj (delq 'b obj)) | |
382 | (add-to-list 'obj (cons 'l ol)) | |
383 | (add-to-list 'obj (cons 't ot)) | |
384 | (add-to-list 'obj (cons 'r or)) | |
385 | (add-to-list 'obj (cons 'b ob)) | |
386 | )) | |
387 | obj) | |
388 | ||
389 | ;;; Balance windows | |
390 | ||
391 | (defun balance-windows (&optional window-or-frame) | |
392 | "Make windows the same heights or widths in window split subtrees. | |
393 | ||
394 | When called non-interactively WINDOW-OR-FRAME may be either a | |
395 | window or a frame. It then balances the windows on the implied | |
396 | frame. If the parameter is a window only the corresponding window | |
397 | subtree is balanced." | |
398 | (interactive) | |
399 | (let ( | |
400 | (wt (bw-get-tree window-or-frame)) | |
401 | (w) | |
402 | (h) | |
403 | (tried-sizes) | |
404 | (last-sizes) | |
405 | (windows (window-list nil 0))) | |
406 | (when wt | |
407 | (while (not (member last-sizes tried-sizes)) | |
408 | (when last-sizes (setq tried-sizes (cons last-sizes tried-sizes))) | |
409 | (setq last-sizes (mapcar (lambda (w) | |
410 | (window-edges w)) | |
411 | windows)) | |
412 | (when (eq 'hor (bw-dir wt)) | |
413 | (setq w (- (bw-r wt) (bw-l wt)))) | |
414 | (when (eq 'ver (bw-dir wt)) | |
415 | (setq h (- (bw-b wt) (bw-t wt)))) | |
416 | (bw-balance-sub wt w h))))) | |
417 | ||
418 | (defun bw-adjust-window (window delta horizontal) | |
419 | "Wrapper around `adjust-window-trailing-edge' with error checking. | |
420 | Arguments WINDOW, DELTA and HORIZONTAL are passed on to that function." | |
421 | ;; `adjust-window-trailing-edge' may fail if delta is too large. | |
422 | (while (>= (abs delta) 1) | |
423 | (condition-case err | |
424 | (progn | |
425 | (adjust-window-trailing-edge window delta horizontal) | |
426 | (setq delta 0)) | |
427 | (error | |
428 | ;;(message "adjust: %s" (error-message-string err)) | |
429 | (setq delta (/ delta 2)))))) | |
430 | ||
431 | (defun bw-balance-sub (wt w h) | |
432 | (setq wt (bw-refresh-edges wt)) | |
433 | (unless w (setq w (- (bw-r wt) (bw-l wt)))) | |
434 | (unless h (setq h (- (bw-b wt) (bw-t wt)))) | |
435 | (if (windowp wt) | |
436 | (progn | |
437 | (when w | |
438 | (let ((dw (- w (- (bw-r wt) (bw-l wt))))) | |
439 | (when (/= 0 dw) | |
440 | (bw-adjust-window wt dw t)))) | |
441 | (when h | |
442 | (let ((dh (- h (- (bw-b wt) (bw-t wt))))) | |
443 | (when (/= 0 dh) | |
444 | (bw-adjust-window wt dh nil))))) | |
445 | (let* ((childs (cdr (assq 'childs wt))) | |
446 | (cw (when w (/ w (if (bw-eqdir 'hor wt) (length childs) 1)))) | |
447 | (ch (when h (/ h (if (bw-eqdir 'ver wt) (length childs) 1))))) | |
448 | (dolist (c childs) | |
449 | (bw-balance-sub c cw ch))))) | |
450 | ||
451 | (defun window-fixed-size-p (&optional window direction) | |
452 | "Return t if WINDOW cannot be resized in DIRECTION. | |
453 | WINDOW defaults to the selected window. DIRECTION can be | |
454 | nil (i.e. any), `height' or `width'." | |
455 | (with-current-buffer (window-buffer window) | |
456 | (when (and (boundp 'window-size-fixed) window-size-fixed) | |
457 | (not (and direction | |
458 | (member (cons direction window-size-fixed) | |
459 | '((height . width) (width . height)))))))) | |
460 | ||
461 | ;;; A different solution to balance-windows. | |
462 | ||
463 | (defvar window-area-factor 1 | |
464 | "Factor by which the window area should be over-estimated. | |
465 | This is used by `balance-windows-area'. | |
466 | Changing this globally has no effect.") | |
467 | (make-variable-buffer-local 'window-area-factor) | |
468 | ||
469 | (defun balance-windows-area () | |
470 | "Make all visible windows the same area (approximately). | |
471 | See also `window-area-factor' to change the relative size of | |
472 | specific buffers." | |
473 | (interactive) | |
474 | (let* ((unchanged 0) (carry 0) (round 0) | |
475 | ;; Remove fixed-size windows. | |
476 | (wins (delq nil (mapcar (lambda (win) | |
477 | (if (not (window-fixed-size-p win)) win)) | |
478 | (window-list nil 'nomini)))) | |
479 | (changelog nil) | |
480 | next) | |
481 | ;; Resizing a window changes the size of surrounding windows in complex | |
482 | ;; ways, so it's difficult to balance them all. The introduction of | |
483 | ;; `adjust-window-trailing-edge' made it a bit easier, but it is still | |
484 | ;; very difficult to do. `balance-window' above takes an off-line | |
485 | ;; approach: get the whole window tree, then balance it, then try to | |
486 | ;; adjust the windows so they fit the result. | |
487 | ;; Here, instead, we take a "local optimization" approach, where we just | |
488 | ;; go through all the windows several times until nothing needs to be | |
489 | ;; changed. The main problem with this approach is that it's difficult | |
490 | ;; to make sure it terminates, so we use some heuristic to try and break | |
491 | ;; off infinite loops. | |
492 | ;; After a round without any change, we allow a second, to give a chance | |
493 | ;; to the carry to propagate a minor imbalance from the end back to | |
494 | ;; the beginning. | |
495 | (while (< unchanged 2) | |
496 | ;; (message "New round") | |
497 | (setq unchanged (1+ unchanged) round (1+ round)) | |
498 | (dolist (win wins) | |
499 | (setq next win) | |
500 | (while (progn (setq next (next-window next)) | |
501 | (window-fixed-size-p next))) | |
502 | ;; (assert (eq next (or (cadr (member win wins)) (car wins)))) | |
503 | (let* ((horiz | |
504 | (< (car (window-edges win)) (car (window-edges next)))) | |
505 | (areadiff (/ (- (* (window-height next) (window-width next) | |
506 | (buffer-local-value 'window-area-factor | |
507 | (window-buffer next))) | |
508 | (* (window-height win) (window-width win) | |
509 | (buffer-local-value 'window-area-factor | |
510 | (window-buffer win)))) | |
511 | (max (buffer-local-value 'window-area-factor | |
512 | (window-buffer win)) | |
513 | (buffer-local-value 'window-area-factor | |
514 | (window-buffer next))))) | |
515 | (edgesize (if horiz | |
516 | (+ (window-height win) (window-height next)) | |
517 | (+ (window-width win) (window-width next)))) | |
518 | (diff (/ areadiff edgesize))) | |
519 | (when (zerop diff) | |
520 | ;; Maybe diff is actually closer to 1 than to 0. | |
521 | (setq diff (/ (* 3 areadiff) (* 2 edgesize)))) | |
522 | (when (and (zerop diff) (not (zerop areadiff))) | |
523 | (setq diff (/ (+ areadiff carry) edgesize)) | |
524 | ;; Change things smoothly. | |
525 | (if (or (> diff 1) (< diff -1)) (setq diff (/ diff 2)))) | |
526 | (if (zerop diff) | |
527 | ;; Make sure negligible differences don't accumulate to | |
528 | ;; become significant. | |
529 | (setq carry (+ carry areadiff)) | |
530 | (bw-adjust-window win diff horiz) | |
531 | ;; (sit-for 0.5) | |
532 | (let ((change (cons win (window-edges win)))) | |
533 | ;; If the same change has been seen already for this window, | |
534 | ;; we're most likely in an endless loop, so don't count it as | |
535 | ;; a change. | |
536 | (unless (member change changelog) | |
537 | (push change changelog) | |
538 | (setq unchanged 0 carry 0))))))) | |
539 | ;; We've now basically balanced all the windows. | |
540 | ;; But there may be some minor off-by-one imbalance left over, | |
541 | ;; so let's do some fine tuning. | |
542 | ;; (bw-finetune wins) | |
543 | ;; (message "Done in %d rounds" round) | |
544 | )) | |
545 | ||
546 | \f | |
547 | (defcustom display-buffer-function nil | |
548 | "If non-nil, function to call to handle `display-buffer'. | |
549 | It will receive two args, the buffer and a flag which if non-nil | |
550 | means that the currently selected window is not acceptable. It | |
551 | should choose or create a window, display the specified buffer in | |
552 | it, and return the window. | |
553 | ||
554 | Commands such as `switch-to-buffer-other-window' and | |
555 | `find-file-other-window' work using this function." | |
556 | :type '(choice | |
557 | (const nil) | |
558 | (function :tag "function")) | |
559 | :group 'windows) | |
560 | ||
56f31926 MR |
561 | (defcustom special-display-buffer-names nil |
562 | "List of names of buffers that should be displayed specially. | |
563 | Displaying a buffer with `display-buffer' or `pop-to-buffer', if | |
564 | its name is in this list, displays the buffer in a way specified | |
565 | by `special-display-function'. `special-display-popup-frame' | |
566 | \(the default for `special-display-function') usually displays | |
567 | the buffer in a separate frame made with the parameters specified | |
568 | by `special-display-frame-alist'. If `special-display-function' | |
569 | has been set to some other function, that function is called with | |
570 | the buffer as first, and nil as second argument. | |
571 | ||
572 | Alternatively, an element of this list can be specified as | |
573 | \(BUFFER-NAME FRAME-PARAMETERS), where BUFFER-NAME is a buffer | |
574 | name and FRAME-PARAMETERS an alist of \(PARAMETER . VALUE) pairs. | |
575 | `special-display-popup-frame' will interpret such pairs as frame | |
576 | parameters when it creates a special frame, overriding the | |
577 | corresponding values from `special-display-frame-alist'. | |
578 | ||
579 | As a special case, if FRAME-PARAMETERS contains (same-window . t) | |
580 | `special-display-popup-frame' displays that buffer in the | |
581 | selected window. If FRAME-PARAMETERS contains (same-frame . t), | |
582 | it displays that buffer in a window on the selected frame. | |
583 | ||
584 | If `special-display-function' specifies some other function than | |
585 | `special-display-popup-frame', that function is called with the | |
586 | buffer named BUFFER-NAME as first, and FRAME-PARAMETERS as second | |
587 | argument. | |
588 | ||
589 | Finally, an element of this list can be also specified as | |
590 | \(BUFFER-NAME FUNCTION OTHER-ARGS). In that case, | |
591 | `special-display-popup-frame' will call FUNCTION with the buffer | |
592 | named BUFFER-NAME as first argument, and OTHER-ARGS as the | |
593 | second. If `special-display-function' specifies some other | |
594 | function, that function is called with the buffer named | |
595 | BUFFER-NAME as first, and the element's cdr as second argument. | |
596 | ||
597 | If this variable appears \"not to work\", because you added a | |
598 | name to it but the corresponding buffer is displayed in the | |
599 | selected window, look at the values of `same-window-buffer-names' | |
600 | and `same-window-regexps'. Those variables take precedence over | |
601 | this one. | |
602 | ||
603 | See also `special-display-regexps'." | |
604 | :type '(repeat | |
605 | (choice :tag "Buffer" | |
606 | :value "" | |
607 | (string :format "%v") | |
608 | (cons :tag "With parameters" | |
609 | :format "%v" | |
610 | :value ("" . nil) | |
611 | (string :format "%v") | |
612 | (repeat :tag "Parameters" | |
613 | (cons :format "%v" | |
614 | (symbol :tag "Parameter") | |
615 | (sexp :tag "Value")))) | |
616 | (list :tag "With function" | |
617 | :format "%v" | |
618 | :value ("" . nil) | |
619 | (string :format "%v") | |
620 | (function :tag "Function") | |
621 | (repeat :tag "Arguments" (sexp))))) | |
622 | :group 'windows | |
623 | :group 'frames) | |
624 | ||
ac549fa5 GM |
625 | ;;;###autoload |
626 | (put 'special-display-buffer-names 'risky-local-variable t) | |
627 | ||
56f31926 MR |
628 | (defcustom special-display-regexps nil |
629 | "List of regexps saying which buffers should be displayed specially. | |
630 | Displaying a buffer with `display-buffer' or `pop-to-buffer', if | |
631 | any regexp in this list matches its name, displays it specially | |
632 | using `special-display-function'. `special-display-popup-frame' | |
633 | \(the default for `special-display-function') usually displays | |
634 | the buffer in a separate frame made with the parameters specified | |
635 | by `special-display-frame-alist'. If `special-display-function' | |
636 | has been set to some other function, that function is called with | |
637 | the buffer as first, and nil as second argument. | |
638 | ||
639 | Alternatively, an element of this list can be specified as | |
640 | \(REGEXP FRAME-PARAMETERS), where REGEXP is a regexp as above and | |
641 | FRAME-PARAMETERS an alist of (PARAMETER . VALUE) pairs. | |
642 | `special-display-popup-frame' will then interpret these pairs as | |
643 | frame parameters when creating a special frame for a buffer whose | |
644 | name matches REGEXP, overriding the corresponding values from | |
645 | `special-display-frame-alist'. | |
646 | ||
647 | As a special case, if FRAME-PARAMETERS contains (same-window . t) | |
648 | `special-display-popup-frame' displays buffers matching REGEXP in | |
649 | the selected window. \(same-frame . t) in FRAME-PARAMETERS means | |
650 | to display such buffers in a window on the selected frame. | |
651 | ||
652 | If `special-display-function' specifies some other function than | |
653 | `special-display-popup-frame', that function is called with the | |
654 | buffer whose name matched REGEXP as first, and FRAME-PARAMETERS | |
655 | as second argument. | |
656 | ||
657 | Finally, an element of this list can be also specified as | |
658 | \(REGEXP FUNCTION OTHER-ARGS). `special-display-popup-frame' | |
659 | will then call FUNCTION with the buffer whose name matched | |
660 | REGEXP as first, and OTHER-ARGS as second argument. If | |
661 | `special-display-function' specifies some other function, that | |
662 | function is called with the buffer whose name matched REGEXP | |
663 | as first, and the element's cdr as second argument. | |
664 | ||
665 | If this variable appears \"not to work\", because you added a | |
666 | name to it but the corresponding buffer is displayed in the | |
667 | selected window, look at the values of `same-window-buffer-names' | |
668 | and `same-window-regexps'. Those variables take precedence over | |
669 | this one. | |
670 | ||
671 | See also `special-display-buffer-names'." | |
672 | :type '(repeat | |
673 | (choice :tag "Buffer" | |
674 | :value "" | |
675 | (regexp :format "%v") | |
676 | (cons :tag "With parameters" | |
677 | :format "%v" | |
678 | :value ("" . nil) | |
679 | (regexp :format "%v") | |
680 | (repeat :tag "Parameters" | |
681 | (cons :format "%v" | |
682 | (symbol :tag "Parameter") | |
683 | (sexp :tag "Value")))) | |
684 | (list :tag "With function" | |
685 | :format "%v" | |
686 | :value ("" . nil) | |
687 | (regexp :format "%v") | |
688 | (function :tag "Function") | |
689 | (repeat :tag "Arguments" (sexp))))) | |
690 | :group 'windows | |
691 | :group 'frames) | |
692 | ||
3c448ab6 MR |
693 | (defun special-display-p (buffer-name) |
694 | "Return non-nil if a buffer named BUFFER-NAME gets a special frame. | |
56f31926 MR |
695 | More precisely, return t if `special-display-buffer-names' or |
696 | `special-display-regexps' contain a string entry equaling or | |
697 | matching BUFFER-NAME. If `special-display-buffer-names' or | |
698 | `special-display-regexps' contain a list entry whose car equals | |
699 | or matches BUFFER-NAME, the return value is the cdr of that | |
700 | entry." | |
98722073 MR |
701 | (let (tmp) |
702 | (cond | |
703 | ((not (stringp buffer-name))) | |
704 | ((member buffer-name special-display-buffer-names) | |
705 | t) | |
706 | ((setq tmp (assoc buffer-name special-display-buffer-names)) | |
707 | (cdr tmp)) | |
708 | ((catch 'found | |
709 | (dolist (regexp special-display-regexps) | |
710 | (cond | |
711 | ((stringp regexp) | |
712 | (when (string-match-p regexp buffer-name) | |
713 | (throw 'found t))) | |
714 | ((and (consp regexp) (stringp (car regexp)) | |
715 | (string-match-p (car regexp) buffer-name)) | |
716 | (throw 'found (cdr regexp)))))))))) | |
3c448ab6 MR |
717 | |
718 | (defcustom special-display-function 'special-display-popup-frame | |
56f31926 MR |
719 | "Function to call for displaying special buffers. |
720 | This function is called with two arguments - the buffer and, | |
721 | optionally, a list - and should return a window displaying that | |
722 | buffer. The default value usually makes a separate frame for the | |
723 | buffer using `special-display-frame-alist' to specify the frame | |
724 | parameters. See the definition of `special-display-popup-frame' | |
725 | for how to specify such a function. | |
726 | ||
727 | A buffer is special when its name is either listed in | |
3c448ab6 MR |
728 | `special-display-buffer-names' or matches a regexp in |
729 | `special-display-regexps'." | |
730 | :type 'function | |
731 | :group 'frames) | |
732 | ||
3c448ab6 MR |
733 | (defcustom same-window-buffer-names nil |
734 | "List of names of buffers that should appear in the \"same\" window. | |
735 | `display-buffer' and `pop-to-buffer' show a buffer whose name is | |
736 | on this list in the selected rather than some other window. | |
737 | ||
738 | An element of this list can be a cons cell instead of just a | |
56f31926 MR |
739 | string. In that case, the cell's car must be a string specifying |
740 | the buffer name. This is for compatibility with | |
3c448ab6 MR |
741 | `special-display-buffer-names'; the cdr of the cons cell is |
742 | ignored. | |
743 | ||
744 | See also `same-window-regexps'." | |
745 | :type '(repeat (string :format "%v")) | |
746 | :group 'windows) | |
747 | ||
748 | (defcustom same-window-regexps nil | |
749 | "List of regexps saying which buffers should appear in the \"same\" window. | |
750 | `display-buffer' and `pop-to-buffer' show a buffer whose name | |
751 | matches a regexp on this list in the selected rather than some | |
752 | other window. | |
753 | ||
754 | An element of this list can be a cons cell instead of just a | |
56f31926 | 755 | string. In that case, the cell's car must be a regexp matching |
3c448ab6 | 756 | the buffer name. This is for compatibility with |
56f31926 | 757 | `special-display-regexps'; the cdr of the cons cell is ignored. |
3c448ab6 MR |
758 | |
759 | See also `same-window-buffer-names'." | |
760 | :type '(repeat (regexp :format "%v")) | |
761 | :group 'windows) | |
762 | ||
56f31926 MR |
763 | (defun same-window-p (buffer-name) |
764 | "Return non-nil if a buffer named BUFFER-NAME would be shown in the \"same\" window. | |
765 | This function returns non-nil if `display-buffer' or | |
766 | `pop-to-buffer' would show a buffer named BUFFER-NAME in the | |
767 | selected rather than \(as usual\) some other window. See | |
768 | `same-window-buffer-names' and `same-window-regexps'." | |
769 | (cond | |
770 | ((not (stringp buffer-name))) | |
771 | ;; The elements of `same-window-buffer-names' can be buffer | |
772 | ;; names or cons cells whose cars are buffer names. | |
773 | ((member buffer-name same-window-buffer-names)) | |
774 | ((assoc buffer-name same-window-buffer-names)) | |
775 | ((catch 'found | |
776 | (dolist (regexp same-window-regexps) | |
777 | ;; The elements of `same-window-regexps' can be regexps | |
778 | ;; or cons cells whose cars are regexps. | |
779 | (when (or (and (stringp regexp) | |
780 | (string-match regexp buffer-name)) | |
781 | (and (consp regexp) (stringp (car regexp)) | |
782 | (string-match-p (car regexp) buffer-name))) | |
783 | (throw 'found t))))))) | |
784 | ||
3c448ab6 MR |
785 | (defcustom pop-up-frames nil |
786 | "Whether `display-buffer' should make a separate frame. | |
787 | If nil, never make a seperate frame. | |
788 | If the value is `graphic-only', make a separate frame | |
789 | on graphic displays only. | |
790 | Any other non-nil value means always make a separate frame." | |
791 | :type '(choice | |
792 | (const :tag "Never" nil) | |
793 | (const :tag "On graphic displays only" graphic-only) | |
794 | (const :tag "Always" t)) | |
795 | :group 'windows) | |
796 | ||
797 | (defcustom display-buffer-reuse-frames nil | |
798 | "Non-nil means `display-buffer' should reuse frames. | |
799 | If the buffer in question is already displayed in a frame, raise | |
800 | that frame." | |
801 | :type 'boolean | |
802 | :version "21.1" | |
803 | :group 'windows) | |
804 | ||
805 | (defcustom pop-up-windows t | |
806 | "Non-nil means `display-buffer' should make a new window." | |
807 | :type 'boolean | |
808 | :group 'windows) | |
809 | ||
8b10a2d1 MR |
810 | (defcustom split-window-preferred-function 'split-window-sensibly |
811 | "Function called by `display-buffer' routines to split a window. | |
812 | This function is called with a window as single argument and is | |
813 | supposed to split that window and return the new window. If the | |
814 | window can (or shall) not be split, it is supposed to return nil. | |
815 | The default is to call the function `split-window-sensibly' which | |
816 | tries to split the window in a way which seems most suitable. | |
817 | You can customize the options `split-height-threshold' and/or | |
818 | `split-width-threshold' in order to have `split-window-sensibly' | |
819 | prefer either vertical or horizontal splitting. | |
820 | ||
821 | If you set this to any other function, bear in mind that the | |
822 | `display-buffer' routines may call this function two times. The | |
823 | argument of the first call is the largest window on its frame. | |
824 | If that call fails to return a live window, the function is | |
825 | called again with the least recently used window as argument. If | |
826 | that call fails too, `display-buffer' will use an existing window | |
827 | to display its buffer. | |
828 | ||
829 | The window selected at the time `display-buffer' was invoked is | |
830 | still selected when this function is called. Hence you can | |
831 | compare the window argument with the value of `selected-window' | |
832 | if you intend to split the selected window instead or if you do | |
833 | not want to split the selected window." | |
834 | :type 'function | |
3c448ab6 MR |
835 | :version "23.1" |
836 | :group 'windows) | |
837 | ||
8b10a2d1 MR |
838 | (defcustom split-height-threshold 80 |
839 | "Minimum height for splitting windows sensibly. | |
840 | If this is an integer, `split-window-sensibly' may split a window | |
841 | vertically only if it has at least this many lines. If this is | |
842 | nil, `split-window-sensibly' is not allowed to split a window | |
843 | vertically. If, however, a window is the only window on its | |
844 | frame, `split-window-sensibly' may split it vertically | |
845 | disregarding the value of this variable." | |
846 | :type '(choice (const nil) (integer :tag "lines")) | |
3c448ab6 MR |
847 | :version "23.1" |
848 | :group 'windows) | |
849 | ||
8b10a2d1 MR |
850 | (defcustom split-width-threshold 160 |
851 | "Minimum width for splitting windows sensibly. | |
852 | If this is an integer, `split-window-sensibly' may split a window | |
853 | horizontally only if it has at least this many columns. If this | |
854 | is nil, `split-window-sensibly' is not allowed to split a window | |
855 | horizontally." | |
856 | :type '(choice (const nil) (integer :tag "columns")) | |
3c448ab6 MR |
857 | :version "23.1" |
858 | :group 'windows) | |
859 | ||
8b10a2d1 MR |
860 | (defun window-splittable-p (window &optional horizontal) |
861 | "Return non-nil if `split-window-sensibly' may split WINDOW. | |
862 | Optional argument HORIZONTAL nil or omitted means check whether | |
863 | `split-window-sensibly' may split WINDOW vertically. HORIZONTAL | |
864 | non-nil means check whether WINDOW may be split horizontally. | |
3c448ab6 | 865 | |
8b10a2d1 | 866 | WINDOW may be split vertically when the following conditions |
3c448ab6 | 867 | hold: |
3c448ab6 MR |
868 | - `window-size-fixed' is either nil or equals `width' for the |
869 | buffer of WINDOW. | |
8b10a2d1 | 870 | - `split-height-threshold' is an integer and WINDOW is at least as |
3c448ab6 | 871 | high as `split-height-threshold'. |
3c448ab6 MR |
872 | - When WINDOW is split evenly, the emanating windows are at least |
873 | `window-min-height' lines tall and can accommodate at least one | |
874 | line plus - if WINDOW has one - a mode line. | |
875 | ||
8b10a2d1 | 876 | WINDOW may be split horizontally when the following conditions |
3c448ab6 | 877 | hold: |
3c448ab6 MR |
878 | - `window-size-fixed' is either nil or equals `height' for the |
879 | buffer of WINDOW. | |
8b10a2d1 | 880 | - `split-width-threshold' is an integer and WINDOW is at least as |
3c448ab6 | 881 | wide as `split-width-threshold'. |
3c448ab6 MR |
882 | - When WINDOW is split evenly, the emanating windows are at least |
883 | `window-min-width' or two (whichever is larger) columns wide." | |
884 | (when (window-live-p window) | |
885 | (with-current-buffer (window-buffer window) | |
886 | (if horizontal | |
887 | ;; A window can be split horizontally when its width is not | |
888 | ;; fixed, it is at least `split-width-threshold' columns wide | |
889 | ;; and at least twice as wide as `window-min-width' and 2 (the | |
890 | ;; latter value is hardcoded). | |
891 | (and (memq window-size-fixed '(nil height)) | |
892 | ;; Testing `window-full-width-p' here hardly makes any | |
893 | ;; sense nowadays. This can be done more intuitively by | |
894 | ;; setting up `split-width-threshold' appropriately. | |
895 | (numberp split-width-threshold) | |
896 | (>= (window-width window) | |
897 | (max split-width-threshold | |
898 | (* 2 (max window-min-width 2))))) | |
899 | ;; A window can be split vertically when its height is not | |
900 | ;; fixed, it is at least `split-height-threshold' lines high, | |
901 | ;; and it is at least twice as high as `window-min-height' and 2 | |
902 | ;; if it has a modeline or 1. | |
903 | (and (memq window-size-fixed '(nil width)) | |
904 | (numberp split-height-threshold) | |
905 | (>= (window-height window) | |
906 | (max split-height-threshold | |
907 | (* 2 (max window-min-height | |
908 | (if mode-line-format 2 1)))))))))) | |
909 | ||
8b10a2d1 MR |
910 | (defun split-window-sensibly (window) |
911 | "Split WINDOW in a way suitable for `display-buffer'. | |
912 | If `split-height-threshold' specifies an integer, WINDOW is at | |
913 | least `split-height-threshold' lines tall and can be split | |
914 | vertically, split WINDOW into two windows one above the other and | |
915 | return the lower window. Otherwise, if `split-width-threshold' | |
916 | specifies an integer, WINDOW is at least `split-width-threshold' | |
917 | columns wide and can be split horizontally, split WINDOW into two | |
918 | windows side by side and return the window on the right. If this | |
919 | can't be done either and WINDOW is the only window on its frame, | |
920 | try to split WINDOW vertically disregarding any value specified | |
921 | by `split-height-threshold'. If that succeeds, return the lower | |
922 | window. Return nil otherwise. | |
923 | ||
924 | By default `display-buffer' routines call this function to split | |
925 | the largest or least recently used window. To change the default | |
926 | customize the option `split-window-preferred-function'. | |
927 | ||
928 | You can enforce this function to not split WINDOW horizontally, | |
929 | by setting \(or binding) the variable `split-width-threshold' to | |
930 | nil. If, in addition, you set `split-height-threshold' to zero, | |
931 | chances increase that this function does split WINDOW vertically. | |
932 | ||
933 | In order to not split WINDOW vertically, set \(or bind) the | |
934 | variable `split-height-threshold' to nil. Additionally, you can | |
935 | set `split-width-threshold' to zero to make a horizontal split | |
936 | more likely to occur. | |
937 | ||
938 | Have a look at the function `window-splittable-p' if you want to | |
939 | know how `split-window-sensibly' determines whether WINDOW can be | |
940 | split." | |
941 | (or (and (window-splittable-p window) | |
942 | ;; Split window vertically. | |
943 | (with-selected-window window | |
944 | (split-window-vertically))) | |
945 | (and (window-splittable-p window t) | |
946 | ;; Split window horizontally. | |
947 | (with-selected-window window | |
948 | (split-window-horizontally))) | |
949 | (and (eq window (frame-root-window (window-frame window))) | |
950 | (not (window-minibuffer-p window)) | |
951 | ;; If WINDOW is the only window on its frame and is not the | |
952 | ;; minibuffer window, try to split it vertically disregarding | |
953 | ;; the value of `split-height-threshold'. | |
954 | (let ((split-height-threshold 0)) | |
955 | (when (window-splittable-p window) | |
956 | (with-selected-window window | |
957 | (split-window-vertically))))))) | |
958 | ||
3c448ab6 | 959 | (defun window--try-to-split-window (window) |
8b10a2d1 MR |
960 | "Try to split WINDOW. |
961 | Return value returned by `split-window-preferred-function' if it | |
962 | represents a live window, nil otherwise." | |
963 | (and (window-live-p window) | |
964 | (not (frame-parameter (window-frame window) 'unsplittable)) | |
965 | (let ((new-window | |
966 | ;; Since `split-window-preferred-function' might | |
967 | ;; throw an error use `condition-case'. | |
968 | (condition-case nil | |
969 | (funcall split-window-preferred-function window) | |
970 | (error nil)))) | |
971 | (and (window-live-p new-window) new-window)))) | |
3c448ab6 MR |
972 | |
973 | (defun window--frame-usable-p (frame) | |
974 | "Return FRAME if it can be used to display a buffer." | |
975 | (when (frame-live-p frame) | |
976 | (let ((window (frame-root-window frame))) | |
977 | ;; `frame-root-window' may be an internal window which is considered | |
978 | ;; "dead" by `window-live-p'. Hence if `window' is not live we | |
979 | ;; implicitly know that `frame' has a visible window we can use. | |
4afba819 SM |
980 | (unless (and (window-live-p window) |
981 | (or (window-minibuffer-p window) | |
982 | ;; If the window is soft-dedicated, the frame is usable. | |
064e57de SM |
983 | ;; Actually, even if the window is really dedicated, |
984 | ;; the frame is still usable by splitting it. | |
985 | ;; At least Emacs-22 allowed it, and it is desirable | |
986 | ;; when displaying same-frame windows. | |
987 | nil ; (eq t (window-dedicated-p window)) | |
988 | )) | |
3c448ab6 MR |
989 | frame)))) |
990 | ||
991 | (defcustom even-window-heights t | |
992 | "If non-nil `display-buffer' will try to even window heights. | |
993 | Otherwise `display-buffer' will leave the window configuration | |
994 | alone. Heights are evened only when `display-buffer' chooses a | |
995 | window that appears above or below the selected window." | |
996 | :type 'boolean | |
997 | :group 'windows) | |
998 | ||
999 | (defun window--even-window-heights (window) | |
1000 | "Even heights of WINDOW and selected window. | |
1001 | Do this only if these windows are vertically adjacent to each | |
1002 | other, `even-window-heights' is non-nil, and the selected window | |
1003 | is higher than WINDOW." | |
1004 | (when (and even-window-heights | |
1005 | (not (eq window (selected-window))) | |
1006 | ;; Don't resize minibuffer windows. | |
1007 | (not (window-minibuffer-p (selected-window))) | |
1008 | (> (window-height (selected-window)) (window-height window)) | |
1009 | (eq (window-frame window) (window-frame (selected-window))) | |
1010 | (let ((sel-edges (window-edges (selected-window))) | |
1011 | (win-edges (window-edges window))) | |
1012 | (and (= (nth 0 sel-edges) (nth 0 win-edges)) | |
1013 | (= (nth 2 sel-edges) (nth 2 win-edges)) | |
1014 | (or (= (nth 1 sel-edges) (nth 3 win-edges)) | |
1015 | (= (nth 3 sel-edges) (nth 1 win-edges)))))) | |
1016 | (let ((window-min-height 1)) | |
1017 | ;; Don't throw an error if we can't even window heights for | |
1018 | ;; whatever reason. | |
1019 | (condition-case nil | |
1020 | (enlarge-window (/ (- (window-height window) (window-height)) 2)) | |
1021 | (error nil))))) | |
1022 | ||
1023 | (defun window--display-buffer-1 (window) | |
1024 | "Raise the frame containing WINDOW. | |
1025 | Do not raise the selected frame. Return WINDOW." | |
1026 | (let* ((frame (window-frame window)) | |
1027 | (visible (frame-visible-p frame))) | |
1028 | (unless (or (not visible) | |
1029 | ;; Assume the selected frame is already visible enough. | |
1030 | (eq frame (selected-frame)) | |
1031 | ;; Assume the frame from which we invoked the minibuffer | |
1032 | ;; is visible. | |
1033 | (and (minibuffer-window-active-p (selected-window)) | |
1034 | (eq frame (window-frame (minibuffer-selected-window))))) | |
1035 | (raise-frame frame)) | |
1036 | window)) | |
1037 | ||
1038 | (defun window--display-buffer-2 (buffer window) | |
1039 | "Display BUFFER in WINDOW and make its frame visible. | |
1040 | Return WINDOW." | |
1041 | (when (and (buffer-live-p buffer) (window-live-p window)) | |
1042 | (set-window-buffer window buffer) | |
1043 | (window--display-buffer-1 window))) | |
1044 | ||
d2c9fc42 SM |
1045 | (defvar display-buffer-mark-dedicated nil |
1046 | "If non-nil, `display-buffer' marks the windows it creates as dedicated. | |
1047 | The actual non-nil value of this variable will be copied to the | |
1048 | `window-dedicated-p' flag.") | |
1049 | ||
3c448ab6 MR |
1050 | (defun display-buffer (buffer-or-name &optional not-this-window frame) |
1051 | "Make buffer BUFFER-OR-NAME appear in some window but don't select it. | |
1052 | BUFFER-OR-NAME must be a buffer or the name of an existing | |
1053 | buffer. Return the window chosen to display BUFFER-OR-NAME or | |
1054 | nil if no such window is found. | |
1055 | ||
1056 | Optional argument NOT-THIS-WINDOW non-nil means display the | |
1057 | buffer in a window other than the selected one, even if it is | |
1058 | already displayed in the selected window. | |
1059 | ||
1060 | Optional argument FRAME specifies which frames to investigate | |
1061 | when the specified buffer is already displayed. If the buffer is | |
1062 | already displayed in some window on one of these frames simply | |
1063 | return that window. Possible values of FRAME are: | |
1064 | ||
1065 | `visible' - consider windows on all visible frames. | |
1066 | ||
1067 | 0 - consider windows on all visible or iconified frames. | |
1068 | ||
1069 | t - consider windows on all frames. | |
1070 | ||
1071 | A specific frame - consider windows on that frame only. | |
1072 | ||
1073 | nil - consider windows on the selected frame \(actually the | |
1074 | last non-minibuffer frame\) only. If, however, either | |
1075 | `display-buffer-reuse-frames' or `pop-up-frames' is non-nil | |
1076 | \(non-nil and not graphic-only on a text-only terminal), | |
1077 | consider all visible or iconified frames." | |
1078 | (interactive "BDisplay buffer:\nP") | |
1079 | (let* ((can-use-selected-window | |
1080 | ;; The selected window is usable unless either NOT-THIS-WINDOW | |
1081 | ;; is non-nil, it is dedicated to its buffer, or it is the | |
1082 | ;; `minibuffer-window'. | |
1083 | (not (or not-this-window | |
1084 | (window-dedicated-p (selected-window)) | |
1085 | (window-minibuffer-p)))) | |
1086 | (buffer (if (bufferp buffer-or-name) | |
1087 | buffer-or-name | |
1088 | (get-buffer buffer-or-name))) | |
1089 | (name-of-buffer (buffer-name buffer)) | |
1090 | ;; On text-only terminals do not pop up a new frame when | |
1091 | ;; `pop-up-frames' equals graphic-only. | |
1092 | (use-pop-up-frames (if (eq pop-up-frames 'graphic-only) | |
1093 | (display-graphic-p) | |
1094 | pop-up-frames)) | |
1095 | ;; `frame-to-use' is the frame where to show `buffer' - either | |
1096 | ;; the selected frame or the last nonminibuffer frame. | |
1097 | (frame-to-use | |
1098 | (or (window--frame-usable-p (selected-frame)) | |
1099 | (window--frame-usable-p (last-nonminibuffer-frame)))) | |
1100 | ;; `window-to-use' is the window we use for showing `buffer'. | |
1101 | window-to-use) | |
1102 | (cond | |
1103 | ((not (buffer-live-p buffer)) | |
1104 | (error "No such buffer %s" buffer)) | |
1105 | (display-buffer-function | |
1106 | ;; Let `display-buffer-function' do the job. | |
1107 | (funcall display-buffer-function buffer not-this-window)) | |
1108 | ((and (not not-this-window) | |
1109 | (eq (window-buffer (selected-window)) buffer)) | |
1110 | ;; The selected window already displays BUFFER and | |
1111 | ;; `not-this-window' is nil, so use it. | |
1112 | (window--display-buffer-1 (selected-window))) | |
1113 | ((and can-use-selected-window (same-window-p name-of-buffer)) | |
1114 | ;; If the buffer's name tells us to use the selected window do so. | |
1115 | (window--display-buffer-2 buffer (selected-window))) | |
1116 | ((let ((frames (or frame | |
1117 | (and (or use-pop-up-frames | |
1118 | display-buffer-reuse-frames | |
1119 | (not (last-nonminibuffer-frame))) | |
1120 | 0) | |
1121 | (last-nonminibuffer-frame)))) | |
e331bbf3 MR |
1122 | (setq window-to-use |
1123 | (catch 'found | |
29c45500 MR |
1124 | ;; Search frames for a window displaying BUFFER. Return |
1125 | ;; the selected window only if we are allowed to do so. | |
1126 | (dolist (window (get-buffer-window-list buffer 'nomini frames)) | |
e331bbf3 MR |
1127 | (when (or can-use-selected-window |
1128 | (not (eq (selected-window) window))) | |
1129 | (throw 'found window)))))) | |
1130 | ;; The buffer is already displayed in some window; use that. | |
3c448ab6 MR |
1131 | (window--display-buffer-1 window-to-use)) |
1132 | ((and special-display-function | |
1133 | ;; `special-display-p' returns either t or a list of frame | |
1134 | ;; parameters to pass to `special-display-function'. | |
1135 | (let ((pars (special-display-p name-of-buffer))) | |
1136 | (when pars | |
1137 | (funcall special-display-function | |
1138 | buffer (if (listp pars) pars)))))) | |
1139 | ((or use-pop-up-frames (not frame-to-use)) | |
1140 | ;; We want or need a new frame. | |
d2c9fc42 SM |
1141 | (let ((win (frame-selected-window (funcall pop-up-frame-function)))) |
1142 | (when display-buffer-mark-dedicated | |
1143 | (set-window-dedicated-p win display-buffer-mark-dedicated)) | |
1144 | (window--display-buffer-2 buffer win))) | |
3c448ab6 MR |
1145 | ((and pop-up-windows |
1146 | ;; Make a new window. | |
1147 | (or (not (frame-parameter frame-to-use 'unsplittable)) | |
1148 | ;; If the selected frame cannot be split look at | |
1149 | ;; `last-nonminibuffer-frame'. | |
1150 | (and (eq frame-to-use (selected-frame)) | |
1151 | (setq frame-to-use (last-nonminibuffer-frame)) | |
1152 | (window--frame-usable-p frame-to-use) | |
1153 | (not (frame-parameter frame-to-use 'unsplittable)))) | |
1154 | ;; Attempt to split largest or least recently used window. | |
1155 | (setq window-to-use | |
1156 | (or (window--try-to-split-window | |
1157 | (get-largest-window frame-to-use t)) | |
1158 | (window--try-to-split-window | |
d2c9fc42 SM |
1159 | (get-lru-window frame-to-use t))))) |
1160 | (when display-buffer-mark-dedicated | |
1161 | (set-window-dedicated-p window-to-use display-buffer-mark-dedicated)) | |
1162 | (window--display-buffer-2 buffer window-to-use)) | |
a9d451f0 MR |
1163 | ((let ((window-to-undedicate |
1164 | ;; When NOT-THIS-WINDOW is non-nil, temporarily dedicate | |
1165 | ;; the selected window to its buffer, to avoid that some of | |
1166 | ;; the `get-' routines below choose it. (Bug#1415) | |
1167 | (and not-this-window (not (window-dedicated-p)) | |
1168 | (set-window-dedicated-p (selected-window) t) | |
1169 | (selected-window)))) | |
1170 | (unwind-protect | |
1171 | (setq window-to-use | |
1172 | ;; Reuse an existing window. | |
1173 | (or (get-lru-window frame-to-use) | |
1174 | (let ((window (get-buffer-window buffer 'visible))) | |
1175 | (unless (and not-this-window | |
1176 | (eq window (selected-window))) | |
1177 | window)) | |
1178 | (get-largest-window 'visible) | |
1179 | (let ((window (get-buffer-window buffer 0))) | |
1180 | (unless (and not-this-window | |
1181 | (eq window (selected-window))) | |
1182 | window)) | |
1183 | (get-largest-window 0) | |
1184 | (frame-selected-window (funcall pop-up-frame-function)))) | |
1185 | (when (window-live-p window-to-undedicate) | |
1186 | ;; Restore dedicated status of selected window. | |
1187 | (set-window-dedicated-p window-to-undedicate nil)))) | |
3c448ab6 MR |
1188 | (window--even-window-heights window-to-use) |
1189 | (window--display-buffer-2 buffer window-to-use))))) | |
1190 | ||
1191 | (defun pop-to-buffer (buffer-or-name &optional other-window norecord) | |
1192 | "Select buffer BUFFER-OR-NAME in some window, preferably a different one. | |
1193 | BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or | |
1194 | nil. If BUFFER-OR-NAME is a string not naming an existent | |
1195 | buffer, create a buffer with that name. If BUFFER-OR-NAME is | |
1196 | nil, choose some other buffer. | |
1197 | ||
1198 | If `pop-up-windows' is non-nil, windows can be split to display | |
1199 | the buffer. If optional second arg OTHER-WINDOW is non-nil, | |
1200 | insist on finding another window even if the specified buffer is | |
1201 | already visible in the selected window, and ignore | |
1202 | `same-window-regexps' and `same-window-buffer-names'. | |
1203 | ||
1204 | If the window to show BUFFER-OR-NAME is not on the selected | |
1205 | frame, raise that window's frame and give it input focus. | |
1206 | ||
1207 | This function returns the buffer it switched to. This uses the | |
1208 | function `display-buffer' as a subroutine; see the documentation | |
1209 | of `display-buffer' for additional customization information. | |
1210 | ||
1211 | Optional third arg NORECORD non-nil means do not put this buffer | |
1212 | at the front of the list of recently selected ones." | |
1213 | (let ((buffer | |
1214 | ;; FIXME: This behavior is carried over from the previous C version | |
1215 | ;; of pop-to-buffer, but really we should use just | |
1216 | ;; `get-buffer' here. | |
1217 | (if (null buffer-or-name) (other-buffer (current-buffer)) | |
1218 | (or (get-buffer buffer-or-name) | |
1219 | (let ((buf (get-buffer-create buffer-or-name))) | |
1220 | (set-buffer-major-mode buf) | |
1221 | buf)))) | |
1222 | (old-window (selected-window)) | |
1223 | (old-frame (selected-frame)) | |
1224 | new-window new-frame) | |
1225 | (set-buffer buffer) | |
1226 | (setq new-window (display-buffer buffer other-window)) | |
1227 | (unless (eq new-window old-window) | |
1228 | ;; `display-buffer' has chosen another window, select it. | |
1229 | (select-window new-window norecord) | |
1230 | (setq new-frame (window-frame new-window)) | |
1231 | (unless (eq new-frame old-frame) | |
1232 | ;; `display-buffer' has chosen another frame, make sure it gets | |
1233 | ;; input focus and is risen. | |
1234 | (select-frame-set-input-focus new-frame))) | |
1235 | buffer)) | |
1236 | ||
1237 | ;; I think this should be the default; I think people will prefer it--rms. | |
1238 | (defcustom split-window-keep-point t | |
1239 | "If non-nil, \\[split-window-vertically] keeps the original point \ | |
1240 | in both children. | |
1241 | This is often more convenient for editing. | |
1242 | If nil, adjust point in each of the two windows to minimize redisplay. | |
1243 | This is convenient on slow terminals, but point can move strangely. | |
1244 | ||
1245 | This option applies only to `split-window-vertically' and | |
1246 | functions that call it. `split-window' always keeps the original | |
1247 | point in both children." | |
1248 | :type 'boolean | |
1249 | :group 'windows) | |
1250 | ||
1251 | (defun split-window-vertically (&optional size) | |
1252 | "Split selected window into two windows, one above the other. | |
1253 | The upper window gets SIZE lines and the lower one gets the rest. | |
1254 | SIZE negative means the lower window gets -SIZE lines and the | |
1255 | upper one the rest. With no argument, split windows equally or | |
1256 | close to it. Both windows display the same buffer, now current. | |
1257 | ||
1258 | If the variable `split-window-keep-point' is non-nil, both new | |
1259 | windows will get the same value of point as the selected window. | |
1260 | This is often more convenient for editing. The upper window is | |
1261 | the selected window. | |
1262 | ||
1263 | Otherwise, we choose window starts so as to minimize the amount of | |
1264 | redisplay; this is convenient on slow terminals. The new selected | |
1265 | window is the one that the current value of point appears in. The | |
1266 | value of point can change if the text around point is hidden by the | |
1267 | new mode line. | |
1268 | ||
1269 | Regardless of the value of `split-window-keep-point', the upper | |
1270 | window is the original one and the return value is the new, lower | |
1271 | window." | |
1272 | (interactive "P") | |
1273 | (let ((old-window (selected-window)) | |
1274 | (old-point (point)) | |
1275 | (size (and size (prefix-numeric-value size))) | |
1276 | moved-by-window-height moved new-window bottom) | |
1277 | (and size (< size 0) | |
1278 | ;; Handle negative SIZE value. | |
1279 | (setq size (+ (window-height) size))) | |
1280 | (setq new-window (split-window nil size)) | |
1281 | (unless split-window-keep-point | |
7fdbcd83 | 1282 | (with-current-buffer (window-buffer) |
3c448ab6 MR |
1283 | (goto-char (window-start)) |
1284 | (setq moved (vertical-motion (window-height))) | |
1285 | (set-window-start new-window (point)) | |
1286 | (when (> (point) (window-point new-window)) | |
1287 | (set-window-point new-window (point))) | |
1288 | (when (= moved (window-height)) | |
1289 | (setq moved-by-window-height t) | |
1290 | (vertical-motion -1)) | |
1291 | (setq bottom (point))) | |
1292 | (and moved-by-window-height | |
1293 | (<= bottom (point)) | |
1294 | (set-window-point old-window (1- bottom))) | |
1295 | (and moved-by-window-height | |
1296 | (<= (window-start new-window) old-point) | |
1297 | (set-window-point new-window old-point) | |
1298 | (select-window new-window))) | |
1299 | (split-window-save-restore-data new-window old-window))) | |
1300 | ||
1301 | ;; This is to avoid compiler warnings. | |
1302 | (defvar view-return-to-alist) | |
1303 | ||
1304 | (defun split-window-save-restore-data (new-window old-window) | |
1305 | (with-current-buffer (window-buffer) | |
1306 | (when view-mode | |
1307 | (let ((old-info (assq old-window view-return-to-alist))) | |
1308 | (when old-info | |
1309 | (push (cons new-window (cons (car (cdr old-info)) t)) | |
1310 | view-return-to-alist)))) | |
1311 | new-window)) | |
1312 | ||
1313 | (defun split-window-horizontally (&optional size) | |
1314 | "Split selected window into two windows side by side. | |
1315 | The selected window becomes the left one and gets SIZE columns. | |
1316 | SIZE negative means the right window gets -SIZE lines. | |
1317 | ||
1318 | SIZE includes the width of the window's scroll bar; if there are | |
1319 | no scroll bars, it includes the width of the divider column to | |
1320 | the window's right, if any. SIZE omitted or nil means split | |
1321 | window equally. | |
1322 | ||
1323 | The selected window remains selected. Return the new window." | |
1324 | (interactive "P") | |
1325 | (let ((old-window (selected-window)) | |
1326 | (size (and size (prefix-numeric-value size)))) | |
1327 | (and size (< size 0) | |
1328 | ;; Handle negative SIZE value. | |
1329 | (setq size (+ (window-width) size))) | |
1330 | (split-window-save-restore-data (split-window nil size t) old-window))) | |
1331 | ||
1332 | \f | |
1333 | (defun set-window-text-height (window height) | |
9992ea0c | 1334 | "Set the height in lines of the text display area of WINDOW to HEIGHT. |
3c448ab6 MR |
1335 | HEIGHT doesn't include the mode line or header line, if any, or |
1336 | any partial-height lines in the text display area. | |
1337 | ||
1338 | Note that the current implementation of this function cannot | |
1339 | always set the height exactly, but attempts to be conservative, | |
1340 | by allocating more lines than are actually needed in the case | |
1341 | where some error may be present." | |
1342 | (let ((delta (- height (window-text-height window)))) | |
1343 | (unless (zerop delta) | |
1344 | ;; Setting window-min-height to a value like 1 can lead to very | |
1345 | ;; bizarre displays because it also allows Emacs to make *other* | |
1346 | ;; windows 1-line tall, which means that there's no more space for | |
1347 | ;; the modeline. | |
1348 | (let ((window-min-height (min 2 height))) ; One text line plus a modeline. | |
1349 | (if (and window (not (eq window (selected-window)))) | |
1350 | (save-selected-window | |
1351 | (select-window window 'norecord) | |
1352 | (enlarge-window delta)) | |
1353 | (enlarge-window delta)))))) | |
1354 | ||
1355 | \f | |
1356 | (defun enlarge-window-horizontally (columns) | |
1357 | "Make selected window COLUMNS wider. | |
1358 | Interactively, if no argument is given, make selected window one | |
1359 | column wider." | |
1360 | (interactive "p") | |
1361 | (enlarge-window columns t)) | |
1362 | ||
1363 | (defun shrink-window-horizontally (columns) | |
1364 | "Make selected window COLUMNS narrower. | |
1365 | Interactively, if no argument is given, make selected window one | |
1366 | column narrower." | |
1367 | (interactive "p") | |
1368 | (shrink-window columns t)) | |
1369 | ||
1370 | (defun window-buffer-height (window) | |
1371 | "Return the height (in screen lines) of the buffer that WINDOW is displaying." | |
1372 | (with-current-buffer (window-buffer window) | |
1373 | (max 1 | |
1374 | (count-screen-lines (point-min) (point-max) | |
1375 | ;; If buffer ends with a newline, ignore it when | |
1376 | ;; counting height unless point is after it. | |
1377 | (eobp) | |
1378 | window)))) | |
1379 | ||
1380 | (defun count-screen-lines (&optional beg end count-final-newline window) | |
1381 | "Return the number of screen lines in the region. | |
1382 | The number of screen lines may be different from the number of actual lines, | |
1383 | due to line breaking, display table, etc. | |
1384 | ||
1385 | Optional arguments BEG and END default to `point-min' and `point-max' | |
1386 | respectively. | |
1387 | ||
1388 | If region ends with a newline, ignore it unless optional third argument | |
1389 | COUNT-FINAL-NEWLINE is non-nil. | |
1390 | ||
1391 | The optional fourth argument WINDOW specifies the window used for obtaining | |
1392 | parameters such as width, horizontal scrolling, and so on. The default is | |
1393 | to use the selected window's parameters. | |
1394 | ||
1395 | Like `vertical-motion', `count-screen-lines' always uses the current buffer, | |
1396 | regardless of which buffer is displayed in WINDOW. This makes possible to use | |
1397 | `count-screen-lines' in any buffer, whether or not it is currently displayed | |
1398 | in some window." | |
1399 | (unless beg | |
1400 | (setq beg (point-min))) | |
1401 | (unless end | |
1402 | (setq end (point-max))) | |
1403 | (if (= beg end) | |
1404 | 0 | |
1405 | (save-excursion | |
1406 | (save-restriction | |
1407 | (widen) | |
1408 | (narrow-to-region (min beg end) | |
1409 | (if (and (not count-final-newline) | |
1410 | (= ?\n (char-before (max beg end)))) | |
1411 | (1- (max beg end)) | |
1412 | (max beg end))) | |
1413 | (goto-char (point-min)) | |
1414 | (1+ (vertical-motion (buffer-size) window)))))) | |
1415 | ||
1416 | (defun fit-window-to-buffer (&optional window max-height min-height) | |
1417 | "Adjust height of WINDOW to display its buffer's contents exactly. | |
9adf1f06 | 1418 | WINDOW defaults to the selected window. |
3c448ab6 | 1419 | Optional argument MAX-HEIGHT specifies the maximum height of the |
f7baca20 MR |
1420 | window and defaults to the maximum permissible height of a window |
1421 | on WINDOW's frame. | |
3c448ab6 MR |
1422 | Optional argument MIN-HEIGHT specifies the minimum height of the |
1423 | window and defaults to `window-min-height'. | |
1424 | Both, MAX-HEIGHT and MIN-HEIGHT are specified in lines and | |
1425 | include the mode line and header line, if any. | |
3c448ab6 | 1426 | |
9adf1f06 MR |
1427 | Return non-nil if height was orderly adjusted, nil otherwise. |
1428 | ||
f7baca20 MR |
1429 | Caution: This function can delete WINDOW and/or other windows |
1430 | when their height shrinks to less than MIN-HEIGHT." | |
1431 | (interactive) | |
1432 | ;; Do all the work in WINDOW and its buffer and restore the selected | |
1433 | ;; window and the current buffer when we're done. | |
9adf1f06 MR |
1434 | (let ((old-buffer (current-buffer)) |
1435 | value) | |
f7baca20 MR |
1436 | (with-selected-window (or window (setq window (selected-window))) |
1437 | (set-buffer (window-buffer)) | |
1438 | ;; Use `condition-case' to handle any fixed-size windows and other | |
1439 | ;; pitfalls nearby. | |
1440 | (condition-case nil | |
1441 | (let* (;; MIN-HEIGHT must not be less than 1 and defaults to | |
1442 | ;; `window-min-height'. | |
1443 | (min-height (max (or min-height window-min-height) 1)) | |
1444 | (max-window-height | |
1445 | ;; Maximum height of any window on this frame. | |
1446 | (min (window-height (frame-root-window)) (frame-height))) | |
1447 | ;; MAX-HEIGHT must not be larger than max-window-height and | |
1448 | ;; defaults to max-window-height. | |
1449 | (max-height | |
1450 | (min (or max-height max-window-height) max-window-height)) | |
1451 | (desired-height | |
1452 | ;; The height necessary to show all of WINDOW's buffer, | |
1453 | ;; constrained by MIN-HEIGHT and MAX-HEIGHT. | |
1454 | (max | |
1455 | (min | |
1456 | ;; For an empty buffer `count-screen-lines' returns zero. | |
1457 | ;; Even in that case we need one line for the cursor. | |
1458 | (+ (max (count-screen-lines) 1) | |
1459 | ;; For non-minibuffers count the mode line, if any. | |
1460 | (if (and (not (window-minibuffer-p)) mode-line-format) | |
1461 | 1 0) | |
1462 | ;; Count the header line, if any. | |
1463 | (if header-line-format 1 0)) | |
1464 | max-height) | |
1465 | min-height)) | |
1466 | (delta | |
1467 | ;; How much the window height has to change. | |
1468 | (if (= (window-height) (window-height (frame-root-window))) | |
1469 | ;; Don't try to resize a full-height window. | |
1470 | 0 | |
1471 | (- desired-height (window-height)))) | |
1472 | ;; Do something reasonable so `enlarge-window' can make | |
1473 | ;; windows as small as MIN-HEIGHT. | |
1474 | (window-min-height (min min-height window-min-height))) | |
1475 | ;; Don't try to redisplay with the cursor at the end on its | |
1476 | ;; own line--that would force a scroll and spoil things. | |
1477 | (when (and (eobp) (bolp) (not (bobp))) | |
1478 | (set-window-point window (1- (window-point)))) | |
1479 | ;; Adjust WINDOW's height to the nominally correct one | |
1480 | ;; (which may actually be slightly off because of variable | |
1481 | ;; height text, etc). | |
1482 | (unless (zerop delta) | |
1483 | (enlarge-window delta)) | |
1484 | ;; `enlarge-window' might have deleted WINDOW, so make sure | |
1485 | ;; WINDOW's still alive for the remainder of this. | |
1486 | ;; Note: Deleting WINDOW is clearly counter-intuitive in | |
1487 | ;; this context, but we can't do much about it given the | |
1488 | ;; current semantics of `enlarge-window'. | |
1489 | (when (window-live-p window) | |
1490 | ;; Check if the last line is surely fully visible. If | |
1491 | ;; not, enlarge the window. | |
1492 | (let ((end (save-excursion | |
1493 | (goto-char (point-max)) | |
1494 | (when (and (bolp) (not (bobp))) | |
1495 | ;; Don't include final newline. | |
1496 | (backward-char 1)) | |
1497 | (when truncate-lines | |
1498 | ;; If line-wrapping is turned off, test the | |
1499 | ;; beginning of the last line for | |
1500 | ;; visibility instead of the end, as the | |
1501 | ;; end of the line could be invisible by | |
1502 | ;; virtue of extending past the edge of the | |
1503 | ;; window. | |
1504 | (forward-line 0)) | |
1505 | (point)))) | |
1506 | (set-window-vscroll window 0) | |
1507 | (while (and (< desired-height max-height) | |
1508 | (= desired-height (window-height)) | |
1509 | (not (pos-visible-in-window-p end))) | |
1510 | (enlarge-window 1) | |
9adf1f06 MR |
1511 | (setq desired-height (1+ desired-height)))) |
1512 | ;; Return non-nil only if nothing "bad" happened. | |
1513 | (setq value t))) | |
f7baca20 MR |
1514 | (error nil))) |
1515 | (when (buffer-live-p old-buffer) | |
9adf1f06 MR |
1516 | (set-buffer old-buffer)) |
1517 | value)) | |
3c448ab6 MR |
1518 | |
1519 | (defun window-safely-shrinkable-p (&optional window) | |
1520 | "Return t if WINDOW can be shrunk without shrinking other windows. | |
1521 | WINDOW defaults to the selected window." | |
1522 | (with-selected-window (or window (selected-window)) | |
1523 | (let ((edges (window-edges))) | |
1524 | (or (= (nth 2 edges) (nth 2 (window-edges (previous-window)))) | |
1525 | (= (nth 0 edges) (nth 0 (window-edges (next-window)))))))) | |
1526 | ||
1527 | (defun shrink-window-if-larger-than-buffer (&optional window) | |
1528 | "Shrink height of WINDOW if its buffer doesn't need so many lines. | |
1529 | More precisely, shrink WINDOW vertically to be as small as | |
1530 | possible, while still showing the full contents of its buffer. | |
1531 | WINDOW defaults to the selected window. | |
1532 | ||
1533 | Do not shrink to less than `window-min-height' lines. Do nothing | |
1534 | if the buffer contains more lines than the present window height, | |
1535 | or if some of the window's contents are scrolled out of view, or | |
1536 | if shrinking this window would also shrink another window, or if | |
1537 | the window is the only window of its frame. | |
1538 | ||
1539 | Return non-nil if the window was shrunk, nil otherwise." | |
1540 | (interactive) | |
1541 | (when (null window) | |
1542 | (setq window (selected-window))) | |
1543 | (let* ((frame (window-frame window)) | |
1544 | (mini (frame-parameter frame 'minibuffer)) | |
1545 | (edges (window-edges window))) | |
1546 | (if (and (not (eq window (frame-root-window frame))) | |
1547 | (window-safely-shrinkable-p window) | |
1548 | (pos-visible-in-window-p (point-min) window) | |
1549 | (not (eq mini 'only)) | |
1550 | (or (not mini) | |
1551 | (let ((mini-window (minibuffer-window frame))) | |
1552 | (or (null mini-window) | |
1553 | (not (eq frame (window-frame mini-window))) | |
1554 | (< (nth 3 edges) | |
1555 | (nth 1 (window-edges mini-window))) | |
1556 | (> (nth 1 edges) | |
1557 | (frame-parameter frame 'menu-bar-lines)))))) | |
1558 | (fit-window-to-buffer window (window-height window))))) | |
1559 | ||
1560 | (defun kill-buffer-and-window () | |
1561 | "Kill the current buffer and delete the selected window." | |
1562 | (interactive) | |
1563 | (let ((window-to-delete (selected-window)) | |
1564 | (buffer-to-kill (current-buffer)) | |
1565 | (delete-window-hook (lambda () | |
1566 | (condition-case nil | |
1567 | (delete-window) | |
1568 | (error nil))))) | |
1569 | (unwind-protect | |
1570 | (progn | |
1571 | (add-hook 'kill-buffer-hook delete-window-hook t t) | |
1572 | (if (kill-buffer (current-buffer)) | |
1573 | ;; If `delete-window' failed before, we rerun it to regenerate | |
1574 | ;; the error so it can be seen in the echo area. | |
1575 | (when (eq (selected-window) window-to-delete) | |
1576 | (delete-window)))) | |
1577 | ;; If the buffer is not dead for some reason (probably because | |
1578 | ;; of a `quit' signal), remove the hook again. | |
1579 | (condition-case nil | |
1580 | (with-current-buffer buffer-to-kill | |
1581 | (remove-hook 'kill-buffer-hook delete-window-hook t)) | |
1582 | (error nil))))) | |
1583 | ||
1584 | (defun quit-window (&optional kill window) | |
1585 | "Quit WINDOW and bury its buffer. | |
1586 | With a prefix argument, kill the buffer instead. WINDOW defaults | |
1587 | to the selected window. | |
1588 | ||
1589 | If WINDOW is non-nil, dedicated, or a minibuffer window, delete | |
1590 | it and, if it's alone on its frame, its frame too. Otherwise, or | |
1591 | if deleting WINDOW fails in any of the preceding cases, display | |
1592 | another buffer in WINDOW using `switch-to-buffer'. | |
1593 | ||
1594 | Optional argument KILL non-nil means kill WINDOW's buffer. | |
1595 | Otherwise, bury WINDOW's buffer, see `bury-buffer'." | |
1596 | (interactive "P") | |
1597 | (let ((buffer (window-buffer window))) | |
1598 | (if (or window | |
1599 | (window-minibuffer-p window) | |
1600 | (window-dedicated-p window)) | |
1601 | ;; WINDOW is either non-nil, a minibuffer window, or dedicated; | |
1602 | ;; try to delete it. | |
a0c859f0 MR |
1603 | (let* ((window (or window (selected-window))) |
1604 | (frame (window-frame window))) | |
3c448ab6 MR |
1605 | (if (eq window (frame-root-window frame)) |
1606 | ;; WINDOW is alone on its frame. `delete-windows-on' | |
1607 | ;; knows how to handle that case. | |
1608 | (delete-windows-on buffer frame) | |
1609 | ;; There are other windows on its frame, delete WINDOW. | |
1610 | (delete-window window))) | |
1611 | ;; Otherwise, switch to another buffer in the selected window. | |
1612 | (switch-to-buffer nil)) | |
1613 | ||
1614 | ;; Deal with the buffer. | |
1615 | (if kill | |
1616 | (kill-buffer buffer) | |
1617 | (bury-buffer buffer)))) | |
1618 | ||
1619 | (defvar recenter-last-op nil | |
1620 | "Indicates the last recenter operation performed. | |
1621 | Possible values: `top', `middle', `bottom'.") | |
1622 | ||
1623 | (defun recenter-top-bottom (&optional arg) | |
1624 | "Move current line to window center, top, and bottom, successively. | |
1625 | With no prefix argument, the first call redraws the frame and | |
1626 | centers point vertically within the window. Successive calls | |
1627 | scroll the window, placing point on the top, bottom, and middle | |
1628 | consecutively. The cycling order is middle -> top -> bottom. | |
1629 | ||
1630 | A prefix argument is handled like `recenter': | |
1631 | With numeric prefix ARG, move current line to window-line ARG. | |
1632 | With plain `C-u', move current line to window center. | |
1633 | ||
1634 | Top and bottom destinations are actually `scroll-margin' lines | |
1635 | the from true window top and bottom." | |
1636 | (interactive "P") | |
1637 | (cond | |
1638 | (arg (recenter arg)) ; Always respect ARG. | |
1639 | ((or (not (eq this-command last-command)) | |
1640 | (eq recenter-last-op 'bottom)) | |
1641 | (setq recenter-last-op 'middle) | |
1642 | (recenter)) | |
1643 | (t | |
1644 | (let ((this-scroll-margin | |
1645 | (min (max 0 scroll-margin) | |
1646 | (truncate (/ (window-body-height) 4.0))))) | |
1647 | (cond ((eq recenter-last-op 'middle) | |
1648 | (setq recenter-last-op 'top) | |
1649 | (recenter this-scroll-margin)) | |
1650 | ((eq recenter-last-op 'top) | |
1651 | (setq recenter-last-op 'bottom) | |
1652 | (recenter (- -1 this-scroll-margin)))))))) | |
1653 | ||
1654 | (define-key global-map [?\C-l] 'recenter-top-bottom) | |
216349f8 SM |
1655 | |
1656 | (defvar move-to-window-line-last-op nil | |
1657 | "Indicates the last move-to-window-line operation performed. | |
1658 | Possible values: `top', `middle', `bottom'.") | |
1659 | ||
1660 | (defun move-to-window-line-top-bottom (&optional arg) | |
1661 | "Position point relative to window. | |
1662 | ||
1663 | With an argument, acts like `move-to-window-line'. | |
1664 | ||
1665 | With no argument, positions point at center of window. | |
1666 | Successive calls positions point at the top, the bottom and again | |
1667 | at the center of the window." | |
1668 | (interactive "P") | |
1669 | (cond | |
1670 | (arg (move-to-window-line arg)) ; Always respect ARG. | |
1671 | ((or (not (eq this-command last-command)) | |
1672 | (eq move-to-window-line-last-op 'bottom)) | |
1673 | (setq move-to-window-line-last-op 'middle) | |
1674 | (call-interactively 'move-to-window-line)) | |
1675 | (t | |
1676 | (let ((this-scroll-margin | |
1677 | (min (max 0 scroll-margin) | |
1678 | (truncate (/ (window-body-height) 4.0))))) | |
1679 | (cond ((eq move-to-window-line-last-op 'middle) | |
1680 | (setq move-to-window-line-last-op 'top) | |
1681 | (move-to-window-line this-scroll-margin)) | |
1682 | ((eq move-to-window-line-last-op 'top) | |
1683 | (setq move-to-window-line-last-op 'bottom) | |
1684 | (move-to-window-line (- -1 this-scroll-margin)))))))) | |
1685 | ||
1686 | (define-key global-map [?\M-r] 'move-to-window-line-top-bottom) | |
1687 | ||
3c448ab6 MR |
1688 | \f |
1689 | (defvar mouse-autoselect-window-timer nil | |
1690 | "Timer used by delayed window autoselection.") | |
1691 | ||
1692 | (defvar mouse-autoselect-window-position nil | |
1693 | "Last mouse position recorded by delayed window autoselection.") | |
1694 | ||
1695 | (defvar mouse-autoselect-window-window nil | |
1696 | "Last window recorded by delayed window autoselection.") | |
1697 | ||
1698 | (defvar mouse-autoselect-window-state nil | |
1699 | "When non-nil, special state of delayed window autoselection. | |
1700 | Possible values are `suspend' \(suspend autoselection after a menu or | |
1701 | scrollbar interaction\) and `select' \(the next invocation of | |
1702 | 'handle-select-window' shall select the window immediately\).") | |
1703 | ||
1704 | (defun mouse-autoselect-window-cancel (&optional force) | |
1705 | "Cancel delayed window autoselection. | |
1706 | Optional argument FORCE means cancel unconditionally." | |
1707 | (unless (and (not force) | |
1708 | ;; Don't cancel for select-window or select-frame events | |
1709 | ;; or when the user drags a scroll bar. | |
1710 | (or (memq this-command | |
1711 | '(handle-select-window handle-switch-frame)) | |
1712 | (and (eq this-command 'scroll-bar-toolkit-scroll) | |
1713 | (memq (nth 4 (event-end last-input-event)) | |
1714 | '(handle end-scroll))))) | |
1715 | (setq mouse-autoselect-window-state nil) | |
1716 | (when (timerp mouse-autoselect-window-timer) | |
1717 | (cancel-timer mouse-autoselect-window-timer)) | |
1718 | (remove-hook 'pre-command-hook 'mouse-autoselect-window-cancel))) | |
1719 | ||
1720 | (defun mouse-autoselect-window-start (mouse-position &optional window suspend) | |
1721 | "Start delayed window autoselection. | |
1722 | MOUSE-POSITION is the last position where the mouse was seen as returned | |
1723 | by `mouse-position'. Optional argument WINDOW non-nil denotes the | |
1724 | window where the mouse was seen. Optional argument SUSPEND non-nil | |
1725 | means suspend autoselection." | |
1726 | ;; Record values for MOUSE-POSITION, WINDOW, and SUSPEND. | |
1727 | (setq mouse-autoselect-window-position mouse-position) | |
1728 | (when window (setq mouse-autoselect-window-window window)) | |
1729 | (setq mouse-autoselect-window-state (when suspend 'suspend)) | |
1730 | ;; Install timer which runs `mouse-autoselect-window-select' after | |
1731 | ;; `mouse-autoselect-window' seconds. | |
1732 | (setq mouse-autoselect-window-timer | |
1733 | (run-at-time | |
1734 | (abs mouse-autoselect-window) nil 'mouse-autoselect-window-select))) | |
1735 | ||
1736 | (defun mouse-autoselect-window-select () | |
1737 | "Select window with delayed window autoselection. | |
1738 | If the mouse position has stabilized in a non-selected window, select | |
1739 | that window. The minibuffer window is selected only if the minibuffer is | |
1740 | active. This function is run by `mouse-autoselect-window-timer'." | |
1741 | (condition-case nil | |
1742 | (let* ((mouse-position (mouse-position)) | |
1743 | (window | |
1744 | (condition-case nil | |
1745 | (window-at (cadr mouse-position) (cddr mouse-position) | |
1746 | (car mouse-position)) | |
1747 | (error nil)))) | |
1748 | (cond | |
1749 | ((or (menu-or-popup-active-p) | |
1750 | (and window | |
1751 | (not (coordinates-in-window-p (cdr mouse-position) window)))) | |
1752 | ;; A menu / popup dialog is active or the mouse is on the scroll-bar | |
1753 | ;; of WINDOW, temporarily suspend delayed autoselection. | |
1754 | (mouse-autoselect-window-start mouse-position nil t)) | |
1755 | ((eq mouse-autoselect-window-state 'suspend) | |
1756 | ;; Delayed autoselection was temporarily suspended, reenable it. | |
1757 | (mouse-autoselect-window-start mouse-position)) | |
1758 | ((and window (not (eq window (selected-window))) | |
1759 | (or (not (numberp mouse-autoselect-window)) | |
1760 | (and (> mouse-autoselect-window 0) | |
1761 | ;; If `mouse-autoselect-window' is positive, select | |
1762 | ;; window if the window is the same as before. | |
1763 | (eq window mouse-autoselect-window-window)) | |
1764 | ;; Otherwise select window if the mouse is at the same | |
1765 | ;; position as before. Observe that the first test after | |
1766 | ;; starting autoselection usually fails since the value of | |
1767 | ;; `mouse-autoselect-window-position' recorded there is the | |
1768 | ;; position where the mouse has entered the new window and | |
1769 | ;; not necessarily where the mouse has stopped moving. | |
1770 | (equal mouse-position mouse-autoselect-window-position)) | |
1771 | ;; The minibuffer is a candidate window if it's active. | |
1772 | (or (not (window-minibuffer-p window)) | |
1773 | (eq window (active-minibuffer-window)))) | |
1774 | ;; Mouse position has stabilized in non-selected window: Cancel | |
1775 | ;; delayed autoselection and try to select that window. | |
1776 | (mouse-autoselect-window-cancel t) | |
1777 | ;; Select window where mouse appears unless the selected window is the | |
1778 | ;; minibuffer. Use `unread-command-events' in order to execute pre- | |
1779 | ;; and post-command hooks and trigger idle timers. To avoid delaying | |
1780 | ;; autoselection again, set `mouse-autoselect-window-state'." | |
1781 | (unless (window-minibuffer-p (selected-window)) | |
1782 | (setq mouse-autoselect-window-state 'select) | |
1783 | (setq unread-command-events | |
1784 | (cons (list 'select-window (list window)) | |
1785 | unread-command-events)))) | |
1786 | ((or (and window (eq window (selected-window))) | |
1787 | (not (numberp mouse-autoselect-window)) | |
1788 | (equal mouse-position mouse-autoselect-window-position)) | |
1789 | ;; Mouse position has either stabilized in the selected window or at | |
1790 | ;; `mouse-autoselect-window-position': Cancel delayed autoselection. | |
1791 | (mouse-autoselect-window-cancel t)) | |
1792 | (t | |
1793 | ;; Mouse position has not stabilized yet, resume delayed | |
1794 | ;; autoselection. | |
1795 | (mouse-autoselect-window-start mouse-position window)))) | |
1796 | (error nil))) | |
1797 | ||
1798 | (defun handle-select-window (event) | |
1799 | "Handle select-window events." | |
1800 | (interactive "e") | |
1801 | (let ((window (posn-window (event-start event)))) | |
1802 | (unless (or (not (window-live-p window)) | |
1803 | ;; Don't switch if we're currently in the minibuffer. | |
1804 | ;; This tries to work around problems where the | |
1805 | ;; minibuffer gets unselected unexpectedly, and where | |
1806 | ;; you then have to move your mouse all the way down to | |
1807 | ;; the minibuffer to select it. | |
1808 | (window-minibuffer-p (selected-window)) | |
1809 | ;; Don't switch to minibuffer window unless it's active. | |
1810 | (and (window-minibuffer-p window) | |
1811 | (not (minibuffer-window-active-p window))) | |
1812 | ;; Don't switch when autoselection shall be delayed. | |
1813 | (and (numberp mouse-autoselect-window) | |
1814 | (not (zerop mouse-autoselect-window)) | |
1815 | (not (eq mouse-autoselect-window-state 'select)) | |
1816 | (progn | |
1817 | ;; Cancel any delayed autoselection. | |
1818 | (mouse-autoselect-window-cancel t) | |
1819 | ;; Start delayed autoselection from current mouse | |
1820 | ;; position and window. | |
1821 | (mouse-autoselect-window-start (mouse-position) window) | |
1822 | ;; Executing a command cancels delayed autoselection. | |
1823 | (add-hook | |
1824 | 'pre-command-hook 'mouse-autoselect-window-cancel)))) | |
1825 | (when mouse-autoselect-window | |
1826 | ;; Reset state of delayed autoselection. | |
1827 | (setq mouse-autoselect-window-state nil) | |
1828 | ;; Run `mouse-leave-buffer-hook' when autoselecting window. | |
1829 | (run-hooks 'mouse-leave-buffer-hook)) | |
1830 | (select-window window)))) | |
1831 | ||
1832 | (defun delete-other-windows-vertically (&optional window) | |
1833 | "Delete the windows in the same column with WINDOW, but not WINDOW itself. | |
1834 | This may be a useful alternative binding for \\[delete-other-windows] | |
1835 | if you often split windows horizontally." | |
1836 | (interactive) | |
1837 | (let* ((window (or window (selected-window))) | |
1838 | (edges (window-edges window)) | |
1839 | (w window) delenda) | |
1840 | (while (not (eq (setq w (next-window w 1)) window)) | |
1841 | (let ((e (window-edges w))) | |
1842 | (when (and (= (car e) (car edges)) | |
1843 | (= (caddr e) (caddr edges))) | |
1844 | (push w delenda)))) | |
1845 | (mapc 'delete-window delenda))) | |
1846 | ||
1847 | (defun truncated-partial-width-window-p (&optional window) | |
1848 | "Return non-nil if lines in WINDOW are specifically truncated due to its width. | |
1849 | WINDOW defaults to the selected window. | |
1850 | Return nil if WINDOW is not a partial-width window | |
1851 | (regardless of the value of `truncate-lines'). | |
1852 | Otherwise, consult the value of `truncate-partial-width-windows' | |
1853 | for the buffer shown in WINDOW." | |
1854 | (unless window | |
1855 | (setq window (selected-window))) | |
1856 | (unless (window-full-width-p window) | |
1857 | (let ((t-p-w-w (buffer-local-value 'truncate-partial-width-windows | |
1858 | (window-buffer window)))) | |
1859 | (if (integerp t-p-w-w) | |
1860 | (< (window-width window) t-p-w-w) | |
1861 | t-p-w-w)))) | |
1862 | ||
1863 | (define-key ctl-x-map "2" 'split-window-vertically) | |
1864 | (define-key ctl-x-map "3" 'split-window-horizontally) | |
1865 | (define-key ctl-x-map "}" 'enlarge-window-horizontally) | |
1866 | (define-key ctl-x-map "{" 'shrink-window-horizontally) | |
1867 | (define-key ctl-x-map "-" 'shrink-window-if-larger-than-buffer) | |
1868 | (define-key ctl-x-map "+" 'balance-windows) | |
1869 | (define-key ctl-x-4-map "0" 'kill-buffer-and-window) | |
1870 | ||
1871 | ;; arch-tag: b508dfcc-c353-4c37-89fa-e773fe10cea9 | |
1872 | ;;; window.el ends here |