window.c 112 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1 2
/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
Karl Heuer's avatar
Karl Heuer committed
3
   Copyright (C) 1985, 86, 87, 93, 94, 95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
Jim Blandy's avatar
Jim Blandy committed
9
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
21

22
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
23 24
#include "lisp.h"
#include "buffer.h"
Jim Blandy's avatar
Jim Blandy committed
25
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
26 27 28 29 30
#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
Jim Blandy's avatar
Jim Blandy committed
31
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
32

33
Lisp_Object Qwindowp, Qwindow_live_p;
Jim Blandy's avatar
Jim Blandy committed
34 35 36 37

Lisp_Object Fnext_window (), Fdelete_window (), Fselect_window ();
Lisp_Object Fset_window_buffer (), Fsplit_window (), Frecenter ();

38
void delete_all_subwindows ();
Jim Blandy's avatar
Jim Blandy committed
39 40 41 42 43 44 45 46
static struct window *decode_window();

/* This is the window in which the terminal's cursor should
   be left when nothing is being done with it.  This must
   always be a leaf window, and its buffer is selected by
   the top level editing loop at the end of each command.

   This value is always the same as
Jim Blandy's avatar
Jim Blandy committed
47
   FRAME_SELECTED_WINDOW (selected_frame).  */
Jim Blandy's avatar
Jim Blandy committed
48 49 50

Lisp_Object selected_window;

Jim Blandy's avatar
Jim Blandy committed
51
/* The minibuffer window of the selected frame.
Jim Blandy's avatar
Jim Blandy committed
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
   Note that you cannot test for minibufferness of an arbitrary window
   by comparing against this; but you can test for minibufferness of
   the selected window.  */
Lisp_Object minibuf_window;

/* Non-nil means it is the window for C-M-v to scroll
   when the minibuffer is selected.  */
Lisp_Object Vminibuf_scroll_window;

/* Non-nil means this is the buffer whose window C-M-v should scroll.  */
Lisp_Object Vother_window_scroll_buffer;

/* Non-nil means it's function to call to display temp buffers.  */
Lisp_Object Vtemp_buffer_show_function;

/* If a window gets smaller than either of these, it is removed. */
int window_min_height;
int window_min_width;

/* Nonzero implies Fdisplay_buffer should create windows. */
int pop_up_windows;

Jim Blandy's avatar
Jim Blandy committed
74 75
/* Nonzero implies make new frames for Fdisplay_buffer.  */
int pop_up_frames;
Jim Blandy's avatar
Jim Blandy committed
76 77

/* Non-nil means use this function instead of default */
Jim Blandy's avatar
Jim Blandy committed
78
Lisp_Object Vpop_up_frame_function;
Jim Blandy's avatar
Jim Blandy committed
79 80 81 82

/* Function to call to handle Fdisplay_buffer.  */
Lisp_Object Vdisplay_buffer_function;

83 84 85 86 87 88 89 90 91
/* List of buffer *names* for buffers that should have their own frames.  */
Lisp_Object Vspecial_display_buffer_names;

/* List of regexps for buffer names that should have their own frames.  */
Lisp_Object Vspecial_display_regexps;

/* Function to pop up a special frame.  */
Lisp_Object Vspecial_display_function;

92 93 94 95 96 97
/* List of buffer *names* for buffers to appear in selected window.  */
Lisp_Object Vsame_window_buffer_names;

/* List of regexps for buffer names to appear in selected window.  */
Lisp_Object Vsame_window_regexps;

98 99 100
/* Hook run at end of temp_output_buffer_show.  */
Lisp_Object Qtemp_buffer_show_hook;

Jim Blandy's avatar
Jim Blandy committed
101 102 103 104 105 106 107 108 109 110
/* Fdisplay_buffer always splits the largest window 
   if that window is more than this high.  */
int split_height_threshold;

/* Number of lines of continuity in scrolling by screenfuls.  */
int next_screen_context_lines;

/* Incremented for each window created.  */
static int sequence_number;

111 112 113
/* Nonzero after init_window_once has finished.  */
static int window_initialized;

Jim Blandy's avatar
Jim Blandy committed
114
#define min(a, b) ((a) < (b) ? (a) : (b))
115 116

extern Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
Jim Blandy's avatar
Jim Blandy committed
117 118

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
119 120 121
  "Returns t if OBJECT is a window.")
  (object)
     Lisp_Object object;
Jim Blandy's avatar
Jim Blandy committed
122
{
123
  return WINDOWP (object) ? Qt : Qnil;
Jim Blandy's avatar
Jim Blandy committed
124 125
}

126
DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
127 128 129
  "Returns t if OBJECT is a window which is currently visible.")
     (object)
     Lisp_Object object;
130
{
131
  return (WINDOWP (object) && ! NILP (XWINDOW (object)->buffer) ? Qt : Qnil);
132 133
}

Jim Blandy's avatar
Jim Blandy committed
134 135 136
Lisp_Object
make_window ()
{
137
  Lisp_Object val;
Jim Blandy's avatar
Jim Blandy committed
138
  register struct window *p;
139 140 141 142 143 144 145 146
  register struct Lisp_Vector *vec;
  int i;

  vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct window));
  for (i = 0; i < VECSIZE (struct window); i++)
    vec->contents[i] = Qnil;
  vec->size = VECSIZE (struct window);
  p = (struct window *)vec;
147 148 149 150 151 152 153 154
  XSETFASTINT (p->sequence_number, ++sequence_number);
  XSETFASTINT (p->left, 0);
  XSETFASTINT (p->top, 0);
  XSETFASTINT (p->height, 0);
  XSETFASTINT (p->width, 0);
  XSETFASTINT (p->hscroll, 0);
  XSETFASTINT (p->last_point_x, 0);
  XSETFASTINT (p->last_point_y, 0);
Jim Blandy's avatar
Jim Blandy committed
155 156
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
157
  XSETFASTINT (p->use_time, 0);
Jim Blandy's avatar
Jim Blandy committed
158
  p->frame = Qnil;
Jim Blandy's avatar
Jim Blandy committed
159 160
  p->display_table = Qnil;
  p->dedicated = Qnil;
161
  XSETWINDOW (val, p);
Jim Blandy's avatar
Jim Blandy committed
162 163 164 165 166 167 168 169 170 171
  return val;
}

DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
  "Return the window that the cursor now appears in and commands apply to.")
  ()
{
  return selected_window;
}

172 173 174 175 176 177
DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
  "Return the window used now for minibuffers.\n\
If the optional argument FRAME is specified, return the minibuffer window\n\
used by that frame.")
  (frame)
    Lisp_Object frame;
Jim Blandy's avatar
Jim Blandy committed
178
{
Jim Blandy's avatar
Jim Blandy committed
179
#ifdef MULTI_FRAME
180
  if (NILP (frame))
181
    XSETFRAME (frame, selected_frame);
182 183 184 185 186
  else
    CHECK_LIVE_FRAME (frame, 0);
#endif

  return FRAME_MINIBUF_WINDOW (XFRAME (frame));
Jim Blandy's avatar
Jim Blandy committed
187 188
}

189
DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
190 191 192 193 194 195 196 197 198 199
  "Returns non-nil if WINDOW is a minibuffer window.")
  (window)
     Lisp_Object window;
{
  struct window *w = decode_window (window);
  return (MINI_WINDOW_P (w) ? Qt : Qnil);
}

DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
  Spos_visible_in_window_p, 0, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
200
  "Return t if position POS is currently on the frame in WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
201 202 203 204 205 206 207 208 209 210 211
Returns nil if that position is scrolled vertically out of view.\n\
POS defaults to point; WINDOW, to the selected window.")
  (pos, window)
     Lisp_Object pos, window;
{
  register struct window *w;
  register int top;
  register int height;
  register int posint;
  register struct buffer *buf;
  struct position posval;
212
  int hscroll;
Jim Blandy's avatar
Jim Blandy committed
213

Jim Blandy's avatar
Jim Blandy committed
214
  if (NILP (pos))
Karl Heuer's avatar
Karl Heuer committed
215
    posint = PT;
Jim Blandy's avatar
Jim Blandy committed
216 217 218 219 220 221
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }

222
  w = decode_window (window);
Jim Blandy's avatar
Jim Blandy committed
223
  top = marker_position (w->start);
224
  hscroll = XINT (w->hscroll);
Jim Blandy's avatar
Jim Blandy committed
225 226 227 228 229 230 231 232 233

  if (posint < top)
    return Qnil;

  height = XFASTINT (w->height) - ! MINI_WINDOW_P (w);

  buf = XBUFFER (w->buffer);
  if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf))
    {
Jim Blandy's avatar
Jim Blandy committed
234
      /* If frame is up to date,
Jim Blandy's avatar
Jim Blandy committed
235 236 237 238 239 240 241 242
	 use the info recorded about how much text fit on it. */
      if (posint < BUF_Z (buf) - XFASTINT (w->window_end_pos)
	  || (XFASTINT (w->window_end_vpos) < height))
	return Qt;
      return Qnil;
    }
  else
    {
243
      if (posint > BUF_ZV (buf))
Jim Blandy's avatar
Jim Blandy committed
244 245
	return Qnil;

246 247 248 249
      /* w->start can be out of range.  If it is, do something reasonable.  */
      if (top < BUF_BEGV (buf) || top > BUF_ZV (buf))
	return Qnil;

Jim Blandy's avatar
Jim Blandy committed
250
      /* If that info is not correct, calculate afresh */
251
      posval = *compute_motion (top, 0, (hscroll ? 1 - hscroll : 0), 0,
252
				posint, height, 0,
253
				window_internal_width (w) - 1,
254
				hscroll, 0, w);
Jim Blandy's avatar
Jim Blandy committed
255 256 257 258 259 260 261 262 263

      return posval.vpos < height ? Qt : Qnil;
    }
}

static struct window *
decode_window (window)
     register Lisp_Object window;
{
Jim Blandy's avatar
Jim Blandy committed
264
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
265 266
    return XWINDOW (selected_window);

267
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
  return XWINDOW (window);
}

DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
  "Return the buffer that WINDOW is displaying.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->buffer;
}

DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
  "Return the number of lines in WINDOW (including its mode line).")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->height;
}

DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
288 289 290 291
  "Return the number of display columns in WINDOW.\n\
This is the width that is usable columns available for text in WINDOW.\n\
If you want to find out how many columns WINDOW takes up,\n\
use  (let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))).")
Jim Blandy's avatar
Jim Blandy committed
292 293 294
  (window)
     Lisp_Object window;
{
295
  return make_number (window_internal_width (decode_window (window)));
Jim Blandy's avatar
Jim Blandy committed
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
}

DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
  "Return the number of columns by which WINDOW is scrolled from left margin.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->hscroll;
}

DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
  "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
NCOL should be zero or positive.")
  (window, ncol)
     register Lisp_Object window, ncol;
{
  register struct window *w;

  CHECK_NUMBER (ncol, 1);
315
  if (XINT (ncol) < 0) XSETFASTINT (ncol, 0);
Jim Blandy's avatar
Jim Blandy committed
316
  w = decode_window (window);
317
  if (XINT (w->hscroll) != XINT (ncol))
318
    XBUFFER (w->buffer)->clip_changed = 1; /* Prevent redisplay shortcuts */
Jim Blandy's avatar
Jim Blandy committed
319 320 321 322
  w->hscroll = ncol;
  return ncol;
}

323 324 325 326 327 328 329 330 331 332 333 334 335 336
DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
       Swindow_redisplay_end_trigger, 0, 1, 0,
  "Return WINDOW's redisplay end trigger value.\n\
See `set-window-redisplay-end-trigger' for more information.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->redisplay_end_trigger;
}

DEFUN ("set-window-redisplay-end-trigger", Fset_window_redisplay_end_trigger,
       Sset_window_redisplay_end_trigger, 2, 2, 0,
  "Set WINDOW's redisplay end trigger value to VALUE.\n\
VALUE should be a buffer position (typically a marker) or nil.\n\
337 338 339 340
If it is a buffer position, then if redisplay in WINDOW reaches a position\n\
beyond VALUE, the functions in `redisplay-end-trigger-functions' are called\n\
with two arguments: WINDOW, and the end trigger value.\n\
Afterwards the end-trigger value is reset to nil.")
341 342 343 344 345 346 347 348 349 350
  (window, value)
     register Lisp_Object window, value;
{
  register struct window *w;

  w = decode_window (window);
  w->redisplay_end_trigger = value;
  return value;
}

Jim Blandy's avatar
Jim Blandy committed
351 352
DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
  "Return a list of the edge coordinates of WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
353
\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
Jim Blandy's avatar
Jim Blandy committed
354 355 356 357 358 359 360 361 362 363 364 365 366 367 368
RIGHT is one more than the rightmost column used by WINDOW,\n\
and BOTTOM is one more than the bottommost row used by WINDOW\n\
 and its mode-line.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  return Fcons (w->left, Fcons (w->top,
           Fcons (make_number (XFASTINT (w->left) + XFASTINT (w->width)),
		  Fcons (make_number (XFASTINT (w->top)
				      + XFASTINT (w->height)),
			 Qnil))));
}

Jim Blandy's avatar
Jim Blandy committed
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
/* Test if the character at column *x, row *y is within window *w.
   If it is not, return 0;
   if it is in the window's text area,
      set *x and *y to its location relative to the upper left corner
         of the window, and
      return 1;
   if it is on the window's modeline, return 2;
   if it is on the border between the window and its right sibling,
      return 3.  */
static int
coordinates_in_window (w, x, y)
     register struct window *w;
     register int *x, *y;
{
  register int left = XINT (w->left);
  register int width = XINT (w->width);
  register int window_height = XINT (w->height);
  register int top = XFASTINT (w->top);

  if (   *x < left || *x >= left + width
      || *y < top  || *y >= top  + window_height)
    return 0;

  /* Is the character is the mode line?  */
  if (*y == top + window_height - 1
394
      && ! MINI_WINDOW_P (w))
Jim Blandy's avatar
Jim Blandy committed
395 396 397 398
    return 2;
  
  /* Is the character in the right border?  */
  if (*x == left + width - 1
Jim Blandy's avatar
Jim Blandy committed
399
      && left + width != FRAME_WIDTH (XFRAME (w->frame)))
Jim Blandy's avatar
Jim Blandy committed
400 401 402 403 404 405 406 407 408 409
    return 3;

  *x -= left;
  *y -= top;
  return 1;
}

DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
  Scoordinates_in_window_p, 2, 2, 0,
  "Return non-nil if COORDINATES are in WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
410
COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
Jim Blandy's avatar
Jim Blandy committed
411
measured in characters from the upper-left corner of the frame.\n\
Jim Blandy's avatar
Jim Blandy committed
412
(0 .  0) denotes the character in the upper left corner of the\n\
Jim Blandy's avatar
Jim Blandy committed
413
frame.\n\
Jim Blandy's avatar
Jim Blandy committed
414 415
If COORDINATES are in the text portion of WINDOW,\n\
   the coordinates relative to the window are returned.\n\
Jim Blandy's avatar
Jim Blandy committed
416
If they are in the mode line of WINDOW, `mode-line' is returned.\n\
Jim Blandy's avatar
Jim Blandy committed
417
If they are on the border between WINDOW and its right sibling,\n\
Jim Blandy's avatar
Jim Blandy committed
418
   `vertical-line' is returned.")
Jim Blandy's avatar
Jim Blandy committed
419 420 421 422 423
  (coordinates, window)
     register Lisp_Object coordinates, window;
{
  int x, y;

424
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440
  CHECK_CONS (coordinates, 1);
  x = XINT (Fcar (coordinates));
  y = XINT (Fcdr (coordinates));

  switch (coordinates_in_window (XWINDOW (window), &x, &y))
    {
    case 0:			/* NOT in window at all. */
      return Qnil;

    case 1:			/* In text part of window. */
      return Fcons (x, y);

    case 2:			/* In mode line of window. */
      return Qmode_line;
      
    case 3:			/* On right border of window.  */
Jim Blandy's avatar
Jim Blandy committed
441
      return Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
442 443 444 445 446 447

    default:
      abort ();
    }
}

Jim Blandy's avatar
Jim Blandy committed
448
/* Find the window containing column x, row y, and return it as a
Jim Blandy's avatar
Jim Blandy committed
449 450 451 452
   Lisp_Object.  If x, y is on the window's modeline, set *part
   to 1; if it is on the separating line between the window and its
   right sibling, set it to 2; otherwise set it to 0.  If there is no
   window under x, y return nil and leave *part unmodified.  */
Jim Blandy's avatar
Jim Blandy committed
453
Lisp_Object
Jim Blandy's avatar
Jim Blandy committed
454 455
window_from_coordinates (frame, x, y, part)
     FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
456
     int x, y;
Jim Blandy's avatar
Jim Blandy committed
457
     int *part;
Jim Blandy's avatar
Jim Blandy committed
458 459 460
{
  register Lisp_Object tem, first;

Jim Blandy's avatar
Jim Blandy committed
461
  tem = first = FRAME_SELECTED_WINDOW (frame);
Jim Blandy's avatar
Jim Blandy committed
462

Jim Blandy's avatar
Jim Blandy committed
463
  do
Jim Blandy's avatar
Jim Blandy committed
464 465 466 467 468
    {
      int found = coordinates_in_window (XWINDOW (tem), &x, &y);

      if (found)
	{
Jim Blandy's avatar
Jim Blandy committed
469
	  *part = found - 1;
Jim Blandy's avatar
Jim Blandy committed
470 471 472
	  return tem;
	}

Jim Blandy's avatar
Jim Blandy committed
473
      tem = Fnext_window (tem, Qt, Qlambda);
Jim Blandy's avatar
Jim Blandy committed
474
    }
Jim Blandy's avatar
Jim Blandy committed
475 476 477
  while (! EQ (tem, first));
  
  return Qnil;
Jim Blandy's avatar
Jim Blandy committed
478 479
}

480
DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
Richard M. Stallman's avatar
Richard M. Stallman committed
481
  "Return window containing coordinates X and Y on FRAME.\n\
Jim Blandy's avatar
Jim Blandy committed
482 483
If omitted, FRAME defaults to the currently selected frame.\n\
The top left corner of the frame is considered to be row 0,\n\
Jim Blandy's avatar
Jim Blandy committed
484
column 0.")
Richard M. Stallman's avatar
Richard M. Stallman committed
485 486
  (x, y, frame)
      Lisp_Object x, y, frame;
Jim Blandy's avatar
Jim Blandy committed
487 488 489
{
  int part;

490
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
491
  if (NILP (frame))
492
    XSETFRAME (frame, selected_frame);
Jim Blandy's avatar
Jim Blandy committed
493
  else
Jim Blandy's avatar
Jim Blandy committed
494
    CHECK_LIVE_FRAME (frame, 2);
495
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
496 497
  CHECK_NUMBER (x, 0);
  CHECK_NUMBER (y, 1);
Jim Blandy's avatar
Jim Blandy committed
498

Jim Blandy's avatar
Jim Blandy committed
499
  return window_from_coordinates (XFRAME (frame),
Richard M. Stallman's avatar
Richard M. Stallman committed
500
				  XINT (x), XINT (y),
Jim Blandy's avatar
Jim Blandy committed
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525
				  &part);
}

DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
  "Return current value of point in WINDOW.\n\
For a nonselected window, this is the value point would have\n\
if that window were selected.\n\
\n\
Note that, when WINDOW is the selected window and its buffer\n\
is also currently selected, the value returned is the same as (point).\n\
It would be more strictly correct to return the `top-level' value\n\
of point, outside of any save-excursion forms.\n\
But that is hard to define.")
  (window)
     Lisp_Object window;
{
  register struct window *w = decode_window (window);

  if (w == XWINDOW (selected_window)
      && current_buffer == XBUFFER (w->buffer))
    return Fpoint ();
  return Fmarker_position (w->pointm);
}

DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
526 527
  "Return position at which display currently starts in WINDOW.\n\
This is updated by redisplay or by calling `set-window-start'.")
Jim Blandy's avatar
Jim Blandy committed
528 529 530 531 532 533
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

534 535
/* This is text temporarily removed from the doc string below.

536 537 538 539 540 541 542
This function returns nil if the position is not currently known.\n\
That happens when redisplay is preempted and doesn't finish.\n\
If in that case you want to compute where the end of the window would\n\
have been if redisplay had finished, do this:\n\
    (save-excursion\n\
      (goto-char (window-start window))\n\
      (vertical-motion (1- (window-height window)) window)\n\
543 544 545 546 547 548 549
      (point))")  */

DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 1, 0,
  "Return position at which display currently ends in WINDOW.\n\
This is updated by redisplay, when it runs to completion.\n\
Simply changing the buffer text or setting `window-start'\n\
does not update this value.")
Jim Blandy's avatar
Jim Blandy committed
550 551 552 553 554
  (window)
     Lisp_Object window;
{
  Lisp_Object value;
  struct window *w = decode_window (window);
555 556 557 558 559
  Lisp_Object buf;

  buf = w->buffer;
  CHECK_BUFFER (buf, 0);

560
#if 0 /* This change broke some things.  We should make it later.  */
561 562 563 564 565 566
  /* If we don't know the end position, return nil.
     The user can compute it with vertical-motion if he wants to.
     It would be nicer to do it automatically,
     but that's so slow that it would probably bother people.  */
  if (NILP (w->window_end_valid))
    return Qnil;
567
#endif
568

569 570
  XSETINT (value,
	   BUF_Z (XBUFFER (buf)) - XFASTINT (w->window_end_pos));
Jim Blandy's avatar
Jim Blandy committed
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603

  return value;
}

DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
  "Make point value in WINDOW be at position POS in WINDOW's buffer.")
  (window, pos)
     Lisp_Object window, pos;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  if (w == XWINDOW (selected_window))
    Fgoto_char (pos);
  else
    set_marker_restricted (w->pointm, pos, w->buffer);

  return pos;
}

DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
  "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
Optional third arg NOFORCE non-nil inhibits next redisplay\n\
from overriding motion of point in order to display at this exact start.")
  (window, pos, noforce)
     Lisp_Object window, pos, noforce;
{
  register struct window *w = decode_window (window);

  CHECK_NUMBER_COERCE_MARKER (pos, 1);
  set_marker_restricted (w->start, pos, w->buffer);
  /* this is not right, but much easier than doing what is right. */
  w->start_at_line_beg = Qnil;
Jim Blandy's avatar
Jim Blandy committed
604
  if (NILP (noforce))
Jim Blandy's avatar
Jim Blandy committed
605 606
    w->force_start = Qt;
  w->update_mode_line = Qt;
607
  XSETFASTINT (w->last_modified, 0);
Jim Blandy's avatar
Jim Blandy committed
608 609
  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
Jim Blandy's avatar
Jim Blandy committed
610 611 612 613 614 615
  return pos;
}

DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
       1, 1, 0,
  "Return WINDOW's dedicated object, usually t or nil.\n\
616
See also `set-window-dedicated-p'.")
Jim Blandy's avatar
Jim Blandy committed
617 618 619 620 621 622
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

623 624 625 626 627 628 629
DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
       Sset_window_dedicated_p, 2, 2, 0,
  "Control whether WINDOW is dedicated to the buffer it displays.\n\
If it is dedicated, Emacs will not automatically change\n\
which buffer appears in it.\n\
The second argument is the new value for the dedication flag;\n\
non-nil means yes.")
Jim Blandy's avatar
Jim Blandy committed
630 631 632 633 634
  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

Jim Blandy's avatar
Jim Blandy committed
635
  if (NILP (arg))
Jim Blandy's avatar
Jim Blandy committed
636 637
    w->dedicated = Qnil;
  else
638
    w->dedicated = Qt;
Jim Blandy's avatar
Jim Blandy committed
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656

  return w->dedicated;
}

DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
       0, 1, 0,
  "Return the display-table that WINDOW is using.")
  (window)
     Lisp_Object window;
{
  return decode_window (window)->display_table;
}

/* Get the display table for use currently on window W.
   This is either W's display table or W's buffer's display table.
   Ignore the specified tables if they are not valid;
   if no valid table is specified, return 0.  */

657
struct Lisp_Char_Table *
Jim Blandy's avatar
Jim Blandy committed
658 659 660 661 662
window_display_table (w)
     struct window *w;
{
  Lisp_Object tem;
  tem = w->display_table;
663 664
  if (DISP_TABLE_P (tem))
    return XCHAR_TABLE (tem);
Jim Blandy's avatar
Jim Blandy committed
665
  tem = XBUFFER (w->buffer)->display_table;
666 667
  if (DISP_TABLE_P (tem))
    return XCHAR_TABLE (tem);
Jim Blandy's avatar
Jim Blandy committed
668
  tem = Vstandard_display_table;
669 670
  if (DISP_TABLE_P (tem))
    return XCHAR_TABLE (tem);
Jim Blandy's avatar
Jim Blandy committed
671 672 673
  return 0;
}

Jim Blandy's avatar
Jim Blandy committed
674
DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
  "Set WINDOW's display-table to TABLE.")
  (window, table)
     register Lisp_Object window, table;
{
  register struct window *w;
  register Lisp_Object z;	/* Return value. */

  w = decode_window (window);
  w->display_table = table;
  return table;
}

/* Record info on buffer window w is displaying
   when it is about to cease to display that buffer.  */
static
unshow_buffer (w)
     register struct window *w;
{
693
  Lisp_Object buf;
Jim Blandy's avatar
Jim Blandy committed
694

695
  buf = w->buffer;
Jim Blandy's avatar
Jim Blandy committed
696 697 698
  if (XBUFFER (buf) != XMARKER (w->pointm)->buffer)
    abort ();

699
#if 0
Jim Blandy's avatar
Jim Blandy committed
700 701 702 703
  if (w == XWINDOW (selected_window)
      || ! EQ (buf, XWINDOW (selected_window)->buffer))
    /* Do this except when the selected window's buffer
       is being removed from some other window.  */
704 705 706 707 708 709 710 711
#endif
    /* last_window_start records the start position that this buffer
       had in the last window to be disconnected from it.
       Now that this statement is unconditional,
       it is possible for the buffer to be displayed in the
       selected window, while last_window_start reflects another
       window which was recently showing the same buffer.
       Some people might say that might be a good thing.  Let's see.  */
Jim Blandy's avatar
Jim Blandy committed
712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
    XBUFFER (buf)->last_window_start = marker_position (w->start);

  /* Point in the selected window's buffer
     is actually stored in that buffer, and the window's pointm isn't used.
     So don't clobber point in that buffer.  */
  if (! EQ (buf, XWINDOW (selected_window)->buffer))
    BUF_PT (XBUFFER (buf))
      = clip_to_bounds (BUF_BEGV (XBUFFER (buf)),
			marker_position (w->pointm),
			BUF_ZV (XBUFFER (buf)));
}

/* Put replacement into the window structure in place of old. */
static
replace_window (old, replacement)
     Lisp_Object old, replacement;
{
  register Lisp_Object tem;
  register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);

Jim Blandy's avatar
Jim Blandy committed
732 733
  /* If OLD is its frame's root_window, then replacement is the new
     root_window for that frame.  */
Jim Blandy's avatar
Jim Blandy committed
734

735
  if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
Jim Blandy's avatar
Jim Blandy committed
736
    FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
Jim Blandy's avatar
Jim Blandy committed
737 738 739 740 741 742 743

  p->left = o->left;
  p->top = o->top;
  p->width = o->width;
  p->height = o->height;

  p->next = tem = o->next;
Jim Blandy's avatar
Jim Blandy committed
744
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
745 746 747
    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
Jim Blandy's avatar
Jim Blandy committed
748
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
749 750 751
    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;
Jim Blandy's avatar
Jim Blandy committed
752
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
    {
      if (EQ (XWINDOW (tem)->vchild, old))
	XWINDOW (tem)->vchild = replacement;
      if (EQ (XWINDOW (tem)->hchild, old))
	XWINDOW (tem)->hchild = replacement;
    }

/*** Here, if replacement is a vertical combination
and so is its new parent, we should make replacement's
children be children of that parent instead.  ***/
}

DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
  "Remove WINDOW from the display.  Default is selected window.")
  (window)
     register Lisp_Object window;
{
  register Lisp_Object tem, parent, sib;
  register struct window *p;
  register struct window *par;

774 775 776
  /* Because this function is called by other C code on non-leaf
     windows, the CHECK_LIVE_WINDOW macro would choke inappropriately,
     so we can't decode_window here.  */
Jim Blandy's avatar
Jim Blandy committed
777
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
778 779 780 781
    window = selected_window;
  else
    CHECK_WINDOW (window, 0);
  p = XWINDOW (window);
782 783 784 785 786 787 788

  /* It's okay to delete an already-deleted window.  */
  if (NILP (p->buffer)
      && NILP (p->hchild)
      && NILP (p->vchild))
    return Qnil;

Jim Blandy's avatar
Jim Blandy committed
789
  parent = p->parent;
Jim Blandy's avatar
Jim Blandy committed
790
  if (NILP (parent))
Jim Blandy's avatar
Jim Blandy committed
791 792 793 794
    error ("Attempt to delete minibuffer or sole ordinary window");
  par = XWINDOW (parent);

  windows_or_buffers_changed++;
795
  FRAME_WINDOW_SIZES_CHANGED (XFRAME (WINDOW_FRAME (p))) = 1;
Jim Blandy's avatar
Jim Blandy committed
796

797 798
  /* Are we trying to delete any frame's selected window?  */
  {
799
    Lisp_Object frame, pwindow;
800

801 802 803 804 805 806 807 808 809 810 811 812 813 814
    /* See if the frame's selected window is either WINDOW
       or any subwindow of it, by finding all that window's parents
       and comparing each one with WINDOW.  */
    frame = WINDOW_FRAME (XWINDOW (window));
    pwindow = FRAME_SELECTED_WINDOW (XFRAME (frame));

    while (!NILP (pwindow))
      {
	if (EQ (window, pwindow))
	  break;
	pwindow = XWINDOW (pwindow)->parent;
      }

    if (EQ (window, pwindow))
815
      {
816 817
	Lisp_Object alternative;
	alternative = Fnext_window (window, Qlambda, Qnil);
818 819 820 821 822 823 824 825 826

	/* If we're about to delete the selected window on the
	   selected frame, then we should use Fselect_window to select
	   the new window.  On the other hand, if we're about to
	   delete the selected window on any other frame, we shouldn't do
	   anything but set the frame's selected_window slot.  */
	if (EQ (window, selected_window))
	  Fselect_window (alternative);
	else
827
	  FRAME_SELECTED_WINDOW (XFRAME (frame)) = alternative;
828 829
      }
  }
Jim Blandy's avatar
Jim Blandy committed
830 831 832 833

  tem = p->buffer;
  /* tem is null for dummy parent windows
     (which have inferiors but not any contents themselves) */
Jim Blandy's avatar
Jim Blandy committed
834
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
835 836 837 838 839 840 841
    {
      unshow_buffer (p);
      unchain_marker (p->pointm);
      unchain_marker (p->start);
    }

  tem = p->next;
Jim Blandy's avatar
Jim Blandy committed
842
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
843 844 845
    XWINDOW (tem)->prev = p->prev;

  tem = p->prev;
Jim Blandy's avatar
Jim Blandy committed
846
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
847 848 849 850 851 852 853 854 855
    XWINDOW (tem)->next = p->next;

  if (EQ (window, par->hchild))
    par->hchild = p->next;
  if (EQ (window, par->vchild))
    par->vchild = p->next;

  /* Find one of our siblings to give our space to.  */
  sib = p->prev;
Jim Blandy's avatar
Jim Blandy committed
856
  if (NILP (sib))
Jim Blandy's avatar
Jim Blandy committed
857 858 859 860 861 862
    {
      /* If p gives its space to its next sibling, that sibling needs
	 to have its top/left side pulled back to where p's is.
	 set_window_{height,width} will re-position the sibling's
	 children.  */
      sib = p->next;
863 864
      XWINDOW (sib)->top = p->top;
      XWINDOW (sib)->left = p->left;
Jim Blandy's avatar
Jim Blandy committed
865 866 867
    }

  /* Stretch that sibling.  */
Jim Blandy's avatar
Jim Blandy committed
868
  if (!NILP (par->vchild))
Jim Blandy's avatar
Jim Blandy committed
869 870 871
    set_window_height (sib,
		       XFASTINT (XWINDOW (sib)->height) + XFASTINT (p->height),
		       1);
Jim Blandy's avatar
Jim Blandy committed
872
  if (!NILP (par->hchild))
Jim Blandy's avatar
Jim Blandy committed
873 874 875 876 877 878 879
    set_window_width (sib,
		      XFASTINT (XWINDOW (sib)->width) + XFASTINT (p->width),
		      1);

  /* If parent now has only one child,
     put the child into the parent's place.  */
  tem = par->hchild;
Jim Blandy's avatar
Jim Blandy committed
880
  if (NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
881
    tem = par->vchild;
Jim Blandy's avatar
Jim Blandy committed
882
  if (NILP (XWINDOW (tem)->next))
Jim Blandy's avatar
Jim Blandy committed
883
    replace_window (parent, tem);
884 885 886 887 888 889 890 891 892 893 894

  /* Since we may be deleting combination windows, we must make sure that
     not only p but all its children have been marked as deleted.  */
  if (! NILP (p->hchild))
    delete_all_subwindows (XWINDOW (p->hchild));
  else if (! NILP (p->vchild))
    delete_all_subwindows (XWINDOW (p->vchild));

  /* Mark this window as deleted.  */
  p->buffer = p->hchild = p->vchild = Qnil;

Jim Blandy's avatar
Jim Blandy committed
895 896 897 898
  return Qnil;
}


Jim Blandy's avatar
Jim Blandy committed
899
extern Lisp_Object next_frame (), prev_frame ();
Jim Blandy's avatar
Jim Blandy committed
900

901 902 903 904 905
/* This comment supplies the doc string for `next-window',
   for make-docfile to see.  We cannot put this in the real DEFUN
   due to limits in the Unix cpp.

DEFUN ("next-window", Ffoo, Sfoo, 0, 3, 0,
Jim Blandy's avatar
Jim Blandy committed
906
  "Return next window after WINDOW in canonical ordering of windows.\n\
Jim Blandy's avatar
Jim Blandy committed
907 908 909 910 911 912 913
If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
Jim Blandy's avatar
Jim Blandy committed
914 915
Several frames may share a single minibuffer; if the minibuffer\n\
counts, all windows on all frames that share that minibuffer count\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
916
too.  Therefore, `next-window' can be used to iterate through the\n\
Jim Blandy's avatar
Jim Blandy committed
917 918
set of windows even when the minibuffer is on another frame.  If the\n\
minibuffer does not count, only windows from WINDOW's frame count.\n\
Jim Blandy's avatar
Jim Blandy committed
919
\n\
Jim Blandy's avatar
Jim Blandy committed
920 921
Optional third arg ALL-FRAMES t means include windows on all frames.\n\
ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
922
above.  ALL-FRAMES = `visible' means include windows on all visible frames.\n\
923
ALL-FRAMES = 0 means include windows on all visible and iconified frames.\n\
924
If ALL-FRAMES is a frame, restrict search to windows on that frame.\n\
925
Anything else means restrict to WINDOW's frame.\n\
Jim Blandy's avatar
Jim Blandy committed
926 927 928 929 930
\n\
If you use consistent values for MINIBUF and ALL-FRAMES, you can use\n\
`next-window' to iterate through the entire cycle of acceptable\n\
windows, eventually ending up back at the window you started with.\n\
`previous-window' traverses the same cycle, in the reverse order.")
931 932 933 934
  (window, minibuf, all_frames) */

DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
       0)
Jim Blandy's avatar
Jim Blandy committed
935 936
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
Jim Blandy's avatar
Jim Blandy committed
937 938
{
  register Lisp_Object tem;
Jim Blandy's avatar
Jim Blandy committed
939
  Lisp_Object start_window;
Jim Blandy's avatar
Jim Blandy committed
940

Jim Blandy's avatar
Jim Blandy committed
941
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
942 943
    window = selected_window;
  else
944
    CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
945

Jim Blandy's avatar
Jim Blandy committed
946 947 948 949
  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
Jim Blandy's avatar
Jim Blandy committed
950
  if (NILP (minibuf))
951 952 953 954 955 956
    minibuf = (minibuf_level ? minibuf_window : Qlambda);
  else if (! EQ (minibuf, Qt))
    minibuf = Qlambda;
  /* Now minibuf can be t => count all minibuffer windows,
     lambda => count none of them,
     or a specific minibuffer window (the active one) to count.  */
Jim Blandy's avatar
Jim Blandy committed
957

958
#ifdef MULTI_FRAME
959
  /* all_frames == nil doesn't specify which frames to include.  */
Jim Blandy's avatar
Jim Blandy committed
960
  if (NILP (all_frames))
961
    all_frames = (! EQ (minibuf, Qlambda)
962 963 964 965 966
		  ? (FRAME_MINIBUF_WINDOW
		     (XFRAME
		      (WINDOW_FRAME
		       (XWINDOW (window)))))
		  : Qnil);
967 968
  else if (EQ (all_frames, Qvisible))
    ;
969 970
  else if (XFASTINT (all_frames) == 0)
    ;
971 972 973 974
  else if (FRAMEP (all_frames) && ! EQ (all_frames, Fwindow_frame (window)))
    /* If all_frames is a frame and window arg isn't on that frame, just
       return the first window on the frame.  */
    return Fframe_first_window (all_frames);
Jim Blandy's avatar
Jim Blandy committed
975 976
  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
977 978
  /* Now all_frames is t meaning search all frames,
     nil meaning search just current frame,
979 980
     visible meaning search just visible frames,
     0 meaning search visible and iconified frames,
981
     or a window, meaning search the frame that window belongs to.  */
982
#endif
Jim Blandy's avatar
Jim Blandy committed
983 984 985 986 987 988 989

  /* Do this loop at least once, to get the next window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a next one.  This loop
	 climbs up the tree.  */
Jim Blandy's avatar
Jim Blandy committed
990 991
      while (tem = XWINDOW (window)->next, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
992
	  window = tem;
Jim Blandy's avatar
Jim Blandy committed
993
	else
Jim Blandy's avatar
Jim Blandy committed
994
	  {
Jim Blandy's avatar
Jim Blandy committed
995 996 997 998 999
	    /* We've reached the end of this frame.
	       Which other frames are acceptable?  */
	    tem = WINDOW_FRAME (XWINDOW (window));
#ifdef MULTI_FRAME
	    if (! NILP (all_frames))
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	      {
		Lisp_Object tem1;

		tem1 = tem;
		tem = next_frame (tem, all_frames);
		/* In the case where the minibuffer is active,
		   and we include its frame as well as the selected one,
		   next_frame may get stuck in that frame.
		   If that happens, go back to the selected frame
		   so we can complete the cycle.  */
		if (EQ (tem, tem1))
1011
		  XSETFRAME (tem, selected_frame);
1012
	      }
Jim Blandy's avatar
Jim Blandy committed
1013
#endif
Jim Blandy's avatar
Jim Blandy committed
1014
	    tem = FRAME_ROOT_WINDOW (XFRAME (tem));
Jim Blandy's avatar
Jim Blandy committed
1015

Jim Blandy's avatar
Jim Blandy committed
1016 1017 1018 1019
	    break;
	  }

      window = tem;
Jim Blandy's avatar
Jim Blandy committed
1020

Jim Blandy's avatar
Jim Blandy committed
1021 1022 1023 1024
      /* If we're in a combination window, find its first child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
Jim Blandy's avatar
Jim Blandy committed
1025
	  if (!NILP (XWINDOW (window)->hchild))
Jim Blandy's avatar
Jim Blandy committed
1026
	    window = XWINDOW (window)->hchild;
Jim Blandy's avatar
Jim Blandy committed
1027
	  else if (!NILP (XWINDOW (window)->vchild))
Jim Blandy's avatar
Jim Blandy committed
1028 1029 1030 1031
	    window = XWINDOW (window)->vchild;
	  else break;
	}
    }
1032
  /* Which windows are acceptable?
Jim Blandy's avatar
Jim Blandy committed
1033
     Exit the loop and accept this window if
1034 1035 1036
     this isn't a minibuffer window,
     or we're accepting all minibuffer windows,
     or this is the active minibuffer and we are accepting that one, or
Jim Blandy's avatar
Jim Blandy committed
1037
     we've come all the way around and we're back at the original window.  */
Jim Blandy's avatar
Jim Blandy committed
1038
  while (MINI_WINDOW_P (XWINDOW (window))
Jim Blandy's avatar
Jim Blandy committed
1039
	 && ! EQ (minibuf, Qt)
1040
	 && ! EQ (minibuf, window)
1041
	 && ! EQ (window, start_window));
Jim Blandy's avatar
Jim Blandy committed
1042 1043 1044 1045

  return window;
}

1046 1047 1048 1049 1050
/* This comment supplies the doc string for `previous-window',
   for make-docfile to see.  We cannot put this in the real DEFUN
   due to limits in the Unix cpp.

DEFUN ("previous-window", Ffoo, Sfoo, 0, 3, 0,
1051
  "Return the window preceding WINDOW in canonical ordering of windows.\n\
Jim Blandy's avatar
Jim Blandy committed
1052 1053 1054 1055 1056 1057 1058
If omitted, WINDOW defaults to the selected window.\n\
\n\
Optional second arg MINIBUF t means count the minibuffer window even\n\
if not active.  MINIBUF nil or omitted means count the minibuffer iff\n\
it is active.  MINIBUF neither t nor nil means not to count the\n\
minibuffer even if it is active.\n\
\n\
Jim Blandy's avatar
Jim Blandy committed
1059 1060
Several frames may share a single minibuffer; if the minibuffer\n\
counts, all windows on all frames that share that minibuffer count\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
1061
too.  Therefore, `previous-window' can be used to iterate through\n\
Jim Blandy's avatar
Jim Blandy committed
1062
the set of windows even when the minibuffer is on another frame.  If\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
1063
the minibuffer does not count, only windows from WINDOW's frame count\n\
Jim Blandy's avatar
Jim Blandy committed
1064
\n\
Jim Blandy's avatar
Jim Blandy committed
1065 1066
Optional third arg ALL-FRAMES t means include windows on all frames.\n\
ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
1067
above.  ALL-FRAMES = `visible' means include windows on all visible frames.\n\
1068
ALL-FRAMES = 0 means include windows on all visible and iconified frames.\n\
1069
If ALL-FRAMES is a frame, restrict search to windows on that frame.\n\
1070
Anything else means restrict to WINDOW's frame.\n\
Jim Blandy's avatar
Jim Blandy committed
1071 1072 1073 1074 1075
\n\
If you use consistent values for MINIBUF and ALL-FRAMES, you can use\n\
`previous-window' to iterate through the entire cycle of acceptable\n\
windows, eventually ending up back at the window you started with.\n\
`next-window' traverses the same cycle, in the reverse order.")
1076 1077 1078 1079 1080
  (window, minibuf, all_frames)  */


DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
       0)
Jim Blandy's avatar
Jim Blandy committed
1081 1082
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
Jim Blandy's avatar
Jim Blandy committed
1083 1084
{
  register Lisp_Object tem;
Jim Blandy's avatar
Jim Blandy committed
1085
  Lisp_Object start_window;
Jim Blandy's avatar
Jim Blandy committed
1086

Jim Blandy's avatar
Jim Blandy committed
1087
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
1088 1089
    window = selected_window;
  else
1090
    CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
1091

Jim Blandy's avatar
Jim Blandy committed
1092 1093 1094 1095
  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
Jim Blandy's avatar
Jim Blandy committed
1096
  if (NILP (minibuf))
1097 1098 1099 1100 1101 1102
    minibuf = (minibuf_level ? minibuf_window : Qlambda);
  else if (! EQ (minibuf, Qt))
    minibuf = Qlambda;
  /* Now minibuf can be t => count all minibuffer windows,
     lambda => count none of them,
     or a specific minibuffer window (the active one) to count.  */
Jim Blandy's avatar
Jim Blandy committed
1103

1104
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
1105 1106 1107
  /* all_frames == nil doesn't specify which frames to include.
     Decide which frames it includes.  */
  if (NILP (all_frames))
1108
    all_frames = (! EQ (minibuf, Qlambda)
Jim Blandy's avatar
Jim Blandy committed
1109 1110 1111
		   ? (FRAME_MINIBUF_WINDOW
		      (XFRAME
		       (WINDOW_FRAME
Jim Blandy's avatar
Jim Blandy committed
1112 1113
			(XWINDOW (window)))))
		   : Qnil);
1114 1115
  else if (EQ (all_frames, Qvisible))
    ;
1116 1117
  else if (XFASTINT (all_frames) == 0)
    ;
1118 1119 1120 1121
  else if (FRAMEP (all_frames) && ! EQ (all_frames, Fwindow_frame (window)))
    /* If all_frames is a frame and window arg isn't on that frame, just
       return the first window on the frame.  */
    return Fframe_first_window (all_frames);
Jim Blandy's avatar
Jim Blandy committed
1122 1123
  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
1124 1125
  /* Now all_frames is t meaning search all frames,
     nil meaning search just current frame,
1126 1127
     visible meaning search just visible frames,
     0 meaning search visible and iconified frames,
1128
     or a window, meaning search the frame that window belongs to.  */
1129
#endif
Jim Blandy's avatar
Jim Blandy committed
1130 1131 1132 1133 1134 1135 1136

  /* Do this loop at least once, to get the previous window, and perhaps
     again, if we hit the minibuffer and that is not acceptable.  */
  do
    {
      /* Find a window that actually has a previous one.  This loop
	 climbs up the tree.  */
Jim Blandy's avatar
Jim Blandy committed
1137 1138
      while (tem = XWINDOW (window)->prev, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1139
	  window = tem;
Jim Blandy's avatar
Jim Blandy committed
1140
	else
Jim Blandy's avatar
Jim Blandy committed
1141
	  {
Jim Blandy's avatar
Jim Blandy committed
1142 1143 1144 1145 1146
	    /* We have found the top window on the frame.
	       Which frames are acceptable?  */
	    tem = WINDOW_FRAME (XWINDOW (window));
#ifdef MULTI_FRAME
	    if (! NILP (all_frames))
Jim Blandy's avatar
Jim Blandy committed
1147 1148 1149 1150 1151 1152 1153 1154 1155
	      /* It's actually important that we use prev_frame here,
		 rather than next_frame.  All the windows acceptable
		 according to the given parameters should form a ring;
		 Fnext_window and Fprevious_window should go back and
		 forth around the ring.  If we use next_frame here,
		 then Fnext_window and Fprevious_window take different
		 paths through the set of acceptable windows.
		 window_loop assumes that these `ring' requirement are
		 met.  */
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
	      {
		Lisp_Object tem1;

		tem1 = tem;
		tem = prev_frame (tem, all_frames);
		/* In the case where the minibuffer is active,
		   and we include its frame as well as the selected one,
		   next_frame may get stuck in that frame.
		   If that happens, go back to the selected frame
		   so we can complete the cycle.  */
		if (EQ (tem, tem1))
1167
		  XSETFRAME (tem, selected_frame);
1168
	      }
Jim Blandy's avatar
Jim Blandy committed
1169
#endif
1170 1171
	    /* If this frame has a minibuffer, find that window first,
	       because it is conceptually the last window in that frame.  */
1172 1173 1174
	    if (FRAME_HAS_MINIBUF_P (XFRAME (tem)))
	      tem = FRAME_MINIBUF_WINDOW (XFRAME (tem));
	    else
1175
	      tem = FRAME_ROOT_WINDOW (XFRAME (tem));
Jim Blandy's avatar
Jim Blandy committed
1176

Jim Blandy's avatar
Jim Blandy committed
1177 1178 1179 1180 1181 1182 1183 1184
	    break;
	  }

      window = tem;
      /* If we're in a combination window, find its last child and
	 recurse on that.  Otherwise, we've found the window we want.  */
      while (1)
	{
Jim Blandy's avatar