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