window.c 94.5 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1 2
/* Window creation, deletion and examination for GNU Emacs.
   Does not include redisplay.
3
   Copyright (C) 1985, 1986, 1987, 1993, 1994 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 19 20
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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

21
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
22 23
#include "lisp.h"
#include "buffer.h"
Jim Blandy's avatar
Jim Blandy committed
24
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
25 26 27 28 29
#include "window.h"
#include "commands.h"
#include "indent.h"
#include "termchar.h"
#include "disptab.h"
Jim Blandy's avatar
Jim Blandy committed
30
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
31

32
Lisp_Object Qwindowp, Qwindow_live_p;
Jim Blandy's avatar
Jim Blandy committed
33 34 35 36

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

37
void delete_all_subwindows ();
Jim Blandy's avatar
Jim Blandy committed
38 39 40 41 42 43 44 45
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
46
   FRAME_SELECTED_WINDOW (selected_frame).  */
Jim Blandy's avatar
Jim Blandy committed
47 48 49

Lisp_Object selected_window;

Jim Blandy's avatar
Jim Blandy committed
50
/* The minibuffer window of the selected frame.
Jim Blandy's avatar
Jim Blandy committed
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
   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
73 74
/* Nonzero implies make new frames for Fdisplay_buffer.  */
int pop_up_frames;
Jim Blandy's avatar
Jim Blandy committed
75 76

/* Non-nil means use this function instead of default */
Jim Blandy's avatar
Jim Blandy committed
77
Lisp_Object Vpop_up_frame_function;
Jim Blandy's avatar
Jim Blandy committed
78 79 80 81

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

82 83 84 85 86 87 88 89 90
/* 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;

Jim Blandy's avatar
Jim Blandy committed
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
/* 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;

#define min(a, b) ((a) < (b) ? (a) : (b))

DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
  "Returns t if OBJ is a window.")
  (obj)
     Lisp_Object obj;
{
  return XTYPE (obj) == Lisp_Window ? Qt : Qnil;
}

111
DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
112 113 114 115 116 117 118 119 120
  "Returns t if OBJ is a window which is currently visible.")
     (obj)
     Lisp_Object obj;
{
  return ((XTYPE (obj) == Lisp_Window
	   && ! NILP (XWINDOW (obj)->buffer))
	  ? Qt : Qnil);
}

Jim Blandy's avatar
Jim Blandy committed
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
Lisp_Object
make_window ()
{
  register Lisp_Object val;
  register struct window *p;

  /* Add sizeof (Lisp_Object) here because sizeof (struct Lisp_Vector)
     includes the first element.  */
  val = Fmake_vector (
    make_number ((sizeof (struct window) - sizeof (struct Lisp_Vector)
		  + sizeof (Lisp_Object))
		 / sizeof (Lisp_Object)),
    Qnil);
  XSETTYPE (val, Lisp_Window);
  p = XWINDOW (val);
  XFASTINT (p->sequence_number) = ++sequence_number;
  XFASTINT (p->left) = XFASTINT (p->top)
    = XFASTINT (p->height) = XFASTINT (p->width)
      = XFASTINT (p->hscroll) = 0;
  XFASTINT (p->last_point_x) = XFASTINT (p->last_point_y) = 0;
  p->start = Fmake_marker ();
  p->pointm = Fmake_marker ();
  XFASTINT (p->use_time) = 0;
Jim Blandy's avatar
Jim Blandy committed
144
  p->frame = Qnil;
Jim Blandy's avatar
Jim Blandy committed
145 146 147 148 149 150 151 152 153 154 155 156
  p->display_table = Qnil;
  p->dedicated = Qnil;
  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;
}

157 158 159 160 161 162
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
163
{
Jim Blandy's avatar
Jim Blandy committed
164
#ifdef MULTI_FRAME
165 166 167 168 169 170 171
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
  else
    CHECK_LIVE_FRAME (frame, 0);
#endif

  return FRAME_MINIBUF_WINDOW (XFRAME (frame));
Jim Blandy's avatar
Jim Blandy committed
172 173
}

174
DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
Jim Blandy's avatar
Jim Blandy committed
175 176 177 178 179 180 181 182 183 184
  "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
185
  "Return t if position POS is currently on the frame in WINDOW.\n\
Jim Blandy's avatar
Jim Blandy committed
186 187 188 189 190 191 192 193 194 195 196
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;
197
  int hscroll;
Jim Blandy's avatar
Jim Blandy committed
198

Jim Blandy's avatar
Jim Blandy committed
199
  if (NILP (pos))
Karl Heuer's avatar
Karl Heuer committed
200
    posint = PT;
Jim Blandy's avatar
Jim Blandy committed
201 202 203 204 205 206
  else
    {
      CHECK_NUMBER_COERCE_MARKER (pos, 0);
      posint = XINT (pos);
    }

207
  w = decode_window (window);
Jim Blandy's avatar
Jim Blandy committed
208
  top = marker_position (w->start);
209
  hscroll = XINT (w->hscroll);
Jim Blandy's avatar
Jim Blandy committed
210 211 212 213 214 215 216 217 218

  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
219
      /* If frame is up to date,
Jim Blandy's avatar
Jim Blandy committed
220 221 222 223 224 225 226 227
	 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
    {
228
      if (posint > BUF_ZV (buf))
Jim Blandy's avatar
Jim Blandy committed
229 230 231
	return Qnil;

      /* If that info is not correct, calculate afresh */
232 233
      posval = *compute_motion (top, 0, (hscroll ? 1 - hscroll : 0),
				posint, height, 0,
234
				window_internal_width (w) - 1,
235
				hscroll, 0, w);
Jim Blandy's avatar
Jim Blandy committed
236 237 238 239 240 241 242 243 244

      return posval.vpos < height ? Qt : Qnil;
    }
}

static struct window *
decode_window (window)
     register Lisp_Object window;
{
Jim Blandy's avatar
Jim Blandy committed
245
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
246 247
    return XWINDOW (selected_window);

248
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268
  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,
269 270 271 272
  "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
273 274 275
  (window)
     Lisp_Object window;
{
276
  return make_number (window_internal_width (decode_window (window)));
Jim Blandy's avatar
Jim Blandy committed
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
}

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);
  if (XINT (ncol) < 0) XFASTINT (ncol) = 0;
  if (XFASTINT (ncol) >= (1 << (SHORTBITS - 1)))
    args_out_of_range (ncol, Qnil);
  w = decode_window (window);
300
  if (XINT (w->hscroll) != XINT (ncol))
Jim Blandy's avatar
Jim Blandy committed
301 302 303 304 305 306 307
    clip_changed = 1;		/* Prevent redisplay shortcuts */
  w->hscroll = ncol;
  return ncol;
}

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
308
\(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
Jim Blandy's avatar
Jim Blandy committed
309 310 311 312 313 314 315 316 317 318 319 320 321 322 323
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
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
/* 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
349
      && ! MINI_WINDOW_P (w))
Jim Blandy's avatar
Jim Blandy committed
350 351 352 353
    return 2;
  
  /* Is the character in the right border?  */
  if (*x == left + width - 1
Jim Blandy's avatar
Jim Blandy committed
354
      && left + width != FRAME_WIDTH (XFRAME (w->frame)))
Jim Blandy's avatar
Jim Blandy committed
355 356 357 358 359 360 361 362 363 364
    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
365
COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
Jim Blandy's avatar
Jim Blandy committed
366
measured in characters from the upper-left corner of the frame.\n\
Jim Blandy's avatar
Jim Blandy committed
367
(0 .  0) denotes the character in the upper left corner of the\n\
Jim Blandy's avatar
Jim Blandy committed
368
frame.\n\
Jim Blandy's avatar
Jim Blandy committed
369 370
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
371
If they are in the mode line of WINDOW, `mode-line' is returned.\n\
Jim Blandy's avatar
Jim Blandy committed
372
If they are on the border between WINDOW and its right sibling,\n\
Jim Blandy's avatar
Jim Blandy committed
373
   `vertical-line' is returned.")
Jim Blandy's avatar
Jim Blandy committed
374 375 376 377 378
  (coordinates, window)
     register Lisp_Object coordinates, window;
{
  int x, y;

379
  CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395
  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
396
      return Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
397 398 399 400 401 402

    default:
      abort ();
    }
}

Jim Blandy's avatar
Jim Blandy committed
403
/* Find the window containing column x, row y, and return it as a
Jim Blandy's avatar
Jim Blandy committed
404 405 406 407
   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
408
Lisp_Object
Jim Blandy's avatar
Jim Blandy committed
409 410
window_from_coordinates (frame, x, y, part)
     FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
411
     int x, y;
Jim Blandy's avatar
Jim Blandy committed
412
     int *part;
Jim Blandy's avatar
Jim Blandy committed
413 414 415
{
  register Lisp_Object tem, first;

Jim Blandy's avatar
Jim Blandy committed
416
  tem = first = FRAME_SELECTED_WINDOW (frame);
Jim Blandy's avatar
Jim Blandy committed
417

Jim Blandy's avatar
Jim Blandy committed
418
  do
Jim Blandy's avatar
Jim Blandy committed
419 420 421 422 423
    {
      int found = coordinates_in_window (XWINDOW (tem), &x, &y);

      if (found)
	{
Jim Blandy's avatar
Jim Blandy committed
424
	  *part = found - 1;
Jim Blandy's avatar
Jim Blandy committed
425 426 427
	  return tem;
	}

Jim Blandy's avatar
Jim Blandy committed
428
      tem = Fnext_window (tem, Qt, Qlambda);
Jim Blandy's avatar
Jim Blandy committed
429
    }
Jim Blandy's avatar
Jim Blandy committed
430 431 432
  while (! EQ (tem, first));
  
  return Qnil;
Jim Blandy's avatar
Jim Blandy committed
433 434
}

435
DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
Richard M. Stallman's avatar
Richard M. Stallman committed
436
  "Return window containing coordinates X and Y on FRAME.\n\
Jim Blandy's avatar
Jim Blandy committed
437 438
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
439
column 0.")
Richard M. Stallman's avatar
Richard M. Stallman committed
440 441
  (x, y, frame)
      Lisp_Object x, y, frame;
Jim Blandy's avatar
Jim Blandy committed
442 443 444
{
  int part;

445
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
446 447
  if (NILP (frame))
    XSET (frame, Lisp_Frame, selected_frame);
Jim Blandy's avatar
Jim Blandy committed
448
  else
Jim Blandy's avatar
Jim Blandy committed
449
    CHECK_LIVE_FRAME (frame, 2);
450
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
451 452
  CHECK_NUMBER (x, 0);
  CHECK_NUMBER (y, 1);
Jim Blandy's avatar
Jim Blandy committed
453

Jim Blandy's avatar
Jim Blandy committed
454
  return window_from_coordinates (XFRAME (frame),
Richard M. Stallman's avatar
Richard M. Stallman committed
455
				  XINT (x), XINT (y),
Jim Blandy's avatar
Jim Blandy committed
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
				  &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,
  "Return position at which display currently starts in WINDOW.")
  (window)
     Lisp_Object window;
{
  return Fmarker_position (decode_window (window)->start);
}

DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 1, 0,
  "Return position at which display currently ends in WINDOW.")
  (window)
     Lisp_Object window;
{
  Lisp_Object value;
  struct window *w = decode_window (window);
495 496 497 498 499
  Lisp_Object buf;

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

Jim Blandy's avatar
Jim Blandy committed
500
  XSET (value, Lisp_Int,
501
	BUF_Z (XBUFFER (buf)) - XFASTINT (w->window_end_pos));
Jim Blandy's avatar
Jim Blandy committed
502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534

  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
535
  if (NILP (noforce))
Jim Blandy's avatar
Jim Blandy committed
536 537 538
    w->force_start = Qt;
  w->update_mode_line = Qt;
  XFASTINT (w->last_modified) = 0;
Jim Blandy's avatar
Jim Blandy committed
539 540
  if (!EQ (window, selected_window))
    windows_or_buffers_changed++;
Jim Blandy's avatar
Jim Blandy committed
541 542 543 544 545 546
  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\
547
See also `set-window-dedicated-p'.")
Jim Blandy's avatar
Jim Blandy committed
548 549 550 551 552 553
  (window)
     Lisp_Object window;
{
  return decode_window (window)->dedicated;
}

554 555 556 557 558 559 560
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
561 562 563 564 565
  (window, arg)
       Lisp_Object window, arg;
{
  register struct window *w = decode_window (window);

Jim Blandy's avatar
Jim Blandy committed
566
  if (NILP (arg))
Jim Blandy's avatar
Jim Blandy committed
567 568
    w->dedicated = Qnil;
  else
569
    w->dedicated = Qt;
Jim Blandy's avatar
Jim Blandy committed
570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604

  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.  */

struct Lisp_Vector *
window_display_table (w)
     struct window *w;
{
  Lisp_Object tem;
  tem = w->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = XBUFFER (w->buffer)->display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  tem = Vstandard_display_table;
  if (XTYPE (tem) == Lisp_Vector && XVECTOR (tem)->size == DISP_TABLE_SIZE)
    return XVECTOR (tem);
  return 0;
}

Jim Blandy's avatar
Jim Blandy committed
605
DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
Jim Blandy's avatar
Jim Blandy committed
606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
  "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;
{
624
  Lisp_Object buf;
Jim Blandy's avatar
Jim Blandy committed
625

626
  buf = w->buffer;
Jim Blandy's avatar
Jim Blandy committed
627 628 629
  if (XBUFFER (buf) != XMARKER (w->pointm)->buffer)
    abort ();

630
#if 0
Jim Blandy's avatar
Jim Blandy committed
631 632 633 634
  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.  */
635 636 637 638 639 640 641 642
#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
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
    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
663 664
  /* 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
665

666
  if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
Jim Blandy's avatar
Jim Blandy committed
667
    FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
Jim Blandy's avatar
Jim Blandy committed
668 669 670 671 672 673 674

  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
675
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
676 677 678
    XWINDOW (tem)->prev = replacement;

  p->prev = tem = o->prev;
Jim Blandy's avatar
Jim Blandy committed
679
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
680 681 682
    XWINDOW (tem)->next = replacement;

  p->parent = tem = o->parent;
Jim Blandy's avatar
Jim Blandy committed
683
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
    {
      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;

705 706 707
  /* 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
708
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
709 710 711 712
    window = selected_window;
  else
    CHECK_WINDOW (window, 0);
  p = XWINDOW (window);
713 714 715 716 717 718 719

  /* 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
720
  parent = p->parent;
Jim Blandy's avatar
Jim Blandy committed
721
  if (NILP (parent))
Jim Blandy's avatar
Jim Blandy committed
722 723 724 725 726
    error ("Attempt to delete minibuffer or sole ordinary window");
  par = XWINDOW (parent);

  windows_or_buffers_changed++;

727 728
  /* Are we trying to delete any frame's selected window?  */
  {
729
    Lisp_Object frame, pwindow;
730

731 732 733 734 735 736 737 738 739 740 741 742 743 744
    /* 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))
745
      {
746 747
	Lisp_Object alternative;
	alternative = Fnext_window (window, Qlambda, Qnil);
748 749 750 751 752 753 754 755 756

	/* 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
757
	  FRAME_SELECTED_WINDOW (XFRAME (frame)) = alternative;
758 759
      }
  }
Jim Blandy's avatar
Jim Blandy committed
760 761 762 763

  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
764
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
765 766 767 768 769 770 771
    {
      unshow_buffer (p);
      unchain_marker (p->pointm);
      unchain_marker (p->start);
    }

  tem = p->next;
Jim Blandy's avatar
Jim Blandy committed
772
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
773 774 775
    XWINDOW (tem)->prev = p->prev;

  tem = p->prev;
Jim Blandy's avatar
Jim Blandy committed
776
  if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
777 778 779 780 781 782 783 784 785
    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
786
  if (NILP (sib))
Jim Blandy's avatar
Jim Blandy committed
787 788 789 790 791 792
    {
      /* 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;
793 794
      XWINDOW (sib)->top = p->top;
      XWINDOW (sib)->left = p->left;
Jim Blandy's avatar
Jim Blandy committed
795 796 797
    }

  /* Stretch that sibling.  */
Jim Blandy's avatar
Jim Blandy committed
798
  if (!NILP (par->vchild))
Jim Blandy's avatar
Jim Blandy committed
799 800 801
    set_window_height (sib,
		       XFASTINT (XWINDOW (sib)->height) + XFASTINT (p->height),
		       1);
Jim Blandy's avatar
Jim Blandy committed
802
  if (!NILP (par->hchild))
Jim Blandy's avatar
Jim Blandy committed
803 804 805 806 807 808 809
    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
810
  if (NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
811
    tem = par->vchild;
Jim Blandy's avatar
Jim Blandy committed
812
  if (NILP (XWINDOW (tem)->next))
Jim Blandy's avatar
Jim Blandy committed
813
    replace_window (parent, tem);
814 815 816 817 818 819 820 821 822 823 824

  /* 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
825 826 827 828
  return Qnil;
}


Jim Blandy's avatar
Jim Blandy committed
829
extern Lisp_Object next_frame (), prev_frame ();
Jim Blandy's avatar
Jim Blandy committed
830

831 832 833 834 835
/* 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
836
  "Return next window after WINDOW in canonical ordering of windows.\n\
Jim Blandy's avatar
Jim Blandy committed
837 838 839 840 841 842 843
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
844 845
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
846
too.  Therefore, `next-window' can be used to iterate through the\n\
Jim Blandy's avatar
Jim Blandy committed
847 848
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
849
\n\
Jim Blandy's avatar
Jim Blandy committed
850 851
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\
852 853
above.  ALL-FRAMES = `visible' means include windows on all visible frames.\n\
Anything else means restrict to WINDOW's frame.\n\
Jim Blandy's avatar
Jim Blandy committed
854 855 856 857 858
\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.")
859 860 861 862
  (window, minibuf, all_frames) */

DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
       0)
Jim Blandy's avatar
Jim Blandy committed
863 864
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
Jim Blandy's avatar
Jim Blandy committed
865 866
{
  register Lisp_Object tem;
Jim Blandy's avatar
Jim Blandy committed
867
  Lisp_Object start_window;
Jim Blandy's avatar
Jim Blandy committed
868

Jim Blandy's avatar
Jim Blandy committed
869
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
870 871
    window = selected_window;
  else
872
    CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
873

Jim Blandy's avatar
Jim Blandy committed
874 875 876 877
  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
Jim Blandy's avatar
Jim Blandy committed
878
  if (NILP (minibuf))
Jim Blandy's avatar
Jim Blandy committed
879 880
    minibuf = (minibuf_level ? Qt : Qlambda);

881
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
882 883 884 885 886 887 888
  /* all_frames == nil doesn't specify which frames to include.
     Decide which frames it includes.  */
  if (NILP (all_frames))
    all_frames = (EQ (minibuf, Qt)
		   ? (FRAME_MINIBUF_WINDOW
		      (XFRAME
		       (WINDOW_FRAME
Jim Blandy's avatar
Jim Blandy committed
889 890
			(XWINDOW (window)))))
		   : Qnil);
891 892
  else if (EQ (all_frames, Qvisible))
    ;
Jim Blandy's avatar
Jim Blandy committed
893 894
  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
895 896 897
  /* Now all_frames is t meaning search all frames,
     nil meaning search just current frame,
     or a window, meaning search the frame that window belongs to.  */
898
#endif
Jim Blandy's avatar
Jim Blandy committed
899 900 901 902 903 904 905

  /* 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
906 907
      while (tem = XWINDOW (window)->next, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
908
	  window = tem;
Jim Blandy's avatar
Jim Blandy committed
909
	else
Jim Blandy's avatar
Jim Blandy committed
910
	  {
Jim Blandy's avatar
Jim Blandy committed
911 912 913 914 915 916
	    /* 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))
	      tem = next_frame (tem, all_frames);
Jim Blandy's avatar
Jim Blandy committed
917
#endif
Jim Blandy's avatar
Jim Blandy committed
918
	    tem = FRAME_ROOT_WINDOW (XFRAME (tem));
Jim Blandy's avatar
Jim Blandy committed
919

Jim Blandy's avatar
Jim Blandy committed
920 921 922 923
	    break;
	  }

      window = tem;
Jim Blandy's avatar
Jim Blandy committed
924

Jim Blandy's avatar
Jim Blandy committed
925 926 927 928
      /* 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
929
	  if (!NILP (XWINDOW (window)->hchild))
Jim Blandy's avatar
Jim Blandy committed
930
	    window = XWINDOW (window)->hchild;
Jim Blandy's avatar
Jim Blandy committed
931
	  else if (!NILP (XWINDOW (window)->vchild))
Jim Blandy's avatar
Jim Blandy committed
932 933 934 935
	    window = XWINDOW (window)->vchild;
	  else break;
	}
    }
Jim Blandy's avatar
Jim Blandy committed
936 937
  /* Which windows are acceptible?
     Exit the loop and accept this window if
Jim Blandy's avatar
Jim Blandy committed
938
     this isn't a minibuffer window, or
Jim Blandy's avatar
Jim Blandy committed
939 940
     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
Jim Blandy's avatar
Jim Blandy committed
941
  while (MINI_WINDOW_P (XWINDOW (window))
Jim Blandy's avatar
Jim Blandy committed
942
	 && ! EQ (minibuf, Qt)
943
	 && ! EQ (window, start_window));
Jim Blandy's avatar
Jim Blandy committed
944 945 946 947

  return window;
}

948 949 950 951 952
/* 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,
Jim Blandy's avatar
Jim Blandy committed
953 954 955 956 957 958 959 960
  "Return the window preceeding WINDOW in canonical ordering of windows.\n\
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
961 962
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
963
too.  Therefore, `previous-window' can be used to iterate through\n\
Jim Blandy's avatar
Jim Blandy committed
964
the set of windows even when the minibuffer is on another frame.  If\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
965
the minibuffer does not count, only windows from WINDOW's frame count\n\
Jim Blandy's avatar
Jim Blandy committed
966
\n\
Jim Blandy's avatar
Jim Blandy committed
967 968
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\
969 970
above.  ALL-FRAMES = `visible' means include windows on all visible frames.\n\
Anything else means restrict to WINDOW's frame.\n\
Jim Blandy's avatar
Jim Blandy committed
971 972 973 974 975
\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.")
976 977 978 979 980
  (window, minibuf, all_frames)  */


DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
       0)
Jim Blandy's avatar
Jim Blandy committed
981 982
  (window, minibuf, all_frames)
     register Lisp_Object window, minibuf, all_frames;
Jim Blandy's avatar
Jim Blandy committed
983 984
{
  register Lisp_Object tem;
Jim Blandy's avatar
Jim Blandy committed
985
  Lisp_Object start_window;
Jim Blandy's avatar
Jim Blandy committed
986

Jim Blandy's avatar
Jim Blandy committed
987
  if (NILP (window))
Jim Blandy's avatar
Jim Blandy committed
988 989
    window = selected_window;
  else
990
    CHECK_LIVE_WINDOW (window, 0);
Jim Blandy's avatar
Jim Blandy committed
991

Jim Blandy's avatar
Jim Blandy committed
992 993 994 995
  start_window = window;

  /* minibuf == nil may or may not include minibuffers.
     Decide if it does.  */
Jim Blandy's avatar
Jim Blandy committed
996
  if (NILP (minibuf))
Jim Blandy's avatar
Jim Blandy committed
997 998
    minibuf = (minibuf_level ? Qt : Qlambda);

999
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
1000 1001 1002 1003 1004 1005 1006
  /* all_frames == nil doesn't specify which frames to include.
     Decide which frames it includes.  */
  if (NILP (all_frames))
    all_frames = (EQ (minibuf, Qt)
		   ? (FRAME_MINIBUF_WINDOW
		      (XFRAME
		       (WINDOW_FRAME
Jim Blandy's avatar
Jim Blandy committed
1007 1008
			(XWINDOW (window)))))
		   : Qnil);
1009 1010
  else if (EQ (all_frames, Qvisible))
    ;
Jim Blandy's avatar
Jim Blandy committed
1011 1012
  else if (! EQ (all_frames, Qt))
    all_frames = Qnil;
1013 1014 1015
  /* Now all_frames is t meaning search all frames,
     nil meaning search just current frame,
     or a window, meaning search the frame that window belongs to.  */
1016
#endif
Jim Blandy's avatar
Jim Blandy committed
1017 1018 1019 1020 1021 1022 1023

  /* 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
1024 1025
      while (tem = XWINDOW (window)->prev, NILP (tem))
	if (tem = XWINDOW (window)->parent, !NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1026
	  window = tem;
Jim Blandy's avatar
Jim Blandy committed
1027
	else
Jim Blandy's avatar
Jim Blandy committed
1028
	  {
Jim Blandy's avatar
Jim Blandy committed
1029 1030 1031 1032 1033
	    /* 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
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
	      /* 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.  */
	      tem = prev_frame (tem, all_frames);
Jim Blandy's avatar
Jim Blandy committed
1044
#endif
1045 1046
	    /* If this frame has a minibuffer, find that window first,
	       because it is conceptually the last window in that frame.  */
1047 1048 1049
	    if (FRAME_HAS_MINIBUF_P (XFRAME (tem)))
	      tem = FRAME_MINIBUF_WINDOW (XFRAME (tem));
	    else
1050
	      tem = FRAME_ROOT_WINDOW (XFRAME (tem));
Jim Blandy's avatar
Jim Blandy committed
1051

Jim Blandy's avatar
Jim Blandy committed
1052 1053 1054 1055 1056 1057 1058 1059
	    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
Jim Blandy committed
1060
	  if (!NILP (XWINDOW (window)->hchild))
Jim Blandy's avatar
Jim Blandy committed
1061
	    window = XWINDOW (window)->hchild;
Jim Blandy's avatar
Jim Blandy committed
1062
	  else if (!NILP (XWINDOW (window)->vchild))
Jim Blandy's avatar
Jim Blandy committed
1063 1064
	    window = XWINDOW (window)->vchild;
	  else break;
Jim Blandy's avatar
Jim Blandy committed
1065
	  while (tem = XWINDOW (window)->next, !NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
1066 1067 1068
	    window = tem;
	}
    }
Jim Blandy's avatar
Jim Blandy committed
1069 1070
  /* Which windows are acceptable?
     Exit the loop and accept this window if
Jim Blandy's avatar
Jim Blandy committed
1071
     this isn't a minibuffer window, or
Jim Blandy's avatar
Jim Blandy committed
1072 1073
     we're accepting minibuffer windows, or
     we've come all the way around and we're back at the original window.  */
Jim Blandy's avatar
Jim Blandy committed
1074
  while (MINI_WINDOW_P (XWINDOW (window))
Jim Blandy's avatar
Jim Blandy committed
1075
	 && !EQ (minibuf, Qt)
1076
	 && !EQ (window, start_window));
Jim Blandy's avatar
Jim Blandy committed
1077 1078 1079 1080

  return window;
}

Jim Blandy's avatar
Jim Blandy committed
1081
DEFUN ("other-window", Fother_window, Sother_window, 1, 2, "p",
Jim Blandy's avatar
Jim Blandy committed
1082 1083
  "Select the ARG'th different window on this frame.\n\
All windows on current frame are arranged in a cyclic order.\n\
Jim Blandy's avatar
Jim Blandy committed
1084 1085
This command selects the window ARG steps away in that order.\n\
A negative ARG moves in the opposite order.  If the optional second\n\
Jim Blandy's avatar
Jim Blandy committed
1086 1087 1088
argument ALL_FRAMES is non-nil, cycle through all frames.")
  (n, all_frames)
     register Lisp_Object n, all_frames;
Jim Blandy's avatar
Jim Blandy committed
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
{
  register int i;
  register Lisp_Object w;

  CHECK_NUMBER (n, 0);
  w = selected_window;
  i = XINT (n);

  while (i > 0)
    {
Jim Blandy's avatar
Jim Blandy committed
1099
      w = Fnext_window (w, Qnil, all_frames);
Jim Blandy's avatar
Jim Blandy committed
1100 1101 1102 1103
      i--;
    }
  while (i < 0)
    {
Jim Blandy's avatar
Jim Blandy committed
1104
      w = Fprevious_window (w, Qnil, all_frames);
Jim Blandy's avatar
Jim Blandy committed
1105 1106 1107 1108 1109 1110 1111 1112
      i++;
    }
  Fselect_window (w);
  return Qnil;
}

/* Look at all windows, performing an operation specified by TYPE
   with argument OBJ.
1113 1114
   If FRAMES is Qt, look at all frames;
                Qnil, look at just the selected frame;
1115
		Qvisible, look at visible frames;
1116
	        a frame, just look at windows on that frame.
Jim Blandy's avatar
Jim Blandy committed
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
   If MINI is non-zero, perform the operation on minibuffer windows too.
*/

enum window_loop
{
  WINDOW_LOOP_UNUSED,
  GET_BUFFER_WINDOW,		/* Arg is buffer */
  GET_LRU_WINDOW,		/* Arg is t for full-width windows only */
  DELETE_OTHER_WINDOWS,		/* Arg is window not to delete */
  DELETE_BUFFER_WINDOWS,	/* Arg is buffer */
  GET_LARGEST_WINDOW,
1128
  UNSHOW_BUFFER		/* Arg is buffer */
Jim Blandy's avatar
Jim Blandy committed
1129 1130 1131
};

static Lisp_Object
Jim Blandy's avatar
Jim Blandy committed
1132
window_loop (type, obj, mini, frames)
Jim Blandy's avatar
Jim Blandy committed
1133
     enum window_loop type;
Jim Blandy's avatar
Jim Blandy committed
1134
     register Lisp_Object obj, frames;
Jim Blandy's avatar
Jim Blandy committed
1135 1136 1137 1138 1139
     int mini;
{
  register Lisp_Object w;
  register Lisp_Object best_window;
  register Lisp_Object next_window;
1140
  register Lisp_Object last_window;
Jim Blandy's avatar
Jim Blandy committed
1141
  FRAME_PTR frame;
1142 1143
  Lisp_Object frame_arg;
  frame_arg = Qt;
Jim Blandy's avatar
Jim Blandy committed
1144

1145
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
1146 1147 1148 1149 1150 1151 1152
  /* If we're only looping through windows on a particular frame,
     frame points to that frame.  If we're looping through windows
     on all frames, frame is 0.  */
  if (FRAMEP (frames))
    frame = XFRAME (frames);
  else if (NILP (frames))
    frame = selected_frame;
Jim Blandy's avatar
Jim Blandy committed
1153
  else
Jim Blandy's avatar
Jim Blandy committed
1154
    frame = 0;
1155 1156 1157 1158
  if (frame)
    frame_arg = Qlambda;
  else if (EQ (frames, Qvisible))
    frame_arg = frames;
1159 1160 1161
#else
  frame = 0;
#endif
Jim Blandy's avatar
Jim Blandy committed
1162

1163 1164 1165 1166
  /* frame_arg is Qlambda to stick to one frame,
     Qvisible to consider all visible frames,
     or Qt otherwise.  */

Jim Blandy's avatar
Jim Blandy committed
1167 1168
  /* Pick a window to start with.  */
  if (XTYPE (obj) == Lisp_Window)
1169
    w = obj;
Jim Blandy's avatar
Jim Blandy committed
1170
  else if (frame)
1171
    w = FRAME_SELECTED_WINDOW (frame);
Jim Blandy's avatar
Jim Blandy committed
1172
  else
1173 1174 1175 1176 1177 1178 1179 1180 1181
    w = FRAME_SELECTED_WINDOW (selected_frame);

  /* Figure out the last window we're going to mess with.  Since
     Fnext_window, given the same options, is guaranteed to go in a
     ring, we can just use Fprevious_window to find the last one.

     We can't just wait until we hit the first window again, because
     it might be deleted.  */

1182
  last_window = Fprevious_window (w, mini ? Qt : Qnil, frame_arg);
Jim Blandy's avatar
Jim Blandy committed
1183 1184

  best_window = Qnil;
1185
  for (;;)
Jim Blandy's avatar
Jim Blandy committed
1186
    {
1187 1188
      FRAME_PTR w_frame = XFRAME (WINDOW_FRAME (XWINDOW (w)));

Jim Blandy's avatar
Jim Blandy committed
1189 1190
      /* Pick the next window now, since some operations will delete
	 the current window.  */
1191
      next_window = Fnext_window (w, mini ? Qt : Qnil, frame_arg);
Jim Blandy's avatar
Jim Blandy committed
1192

1193 1194 1195
      /* Note that we do not pay attention here to whether
	 the frame is visible, since Fnext_window skips non-visible frames
	 if that is desired, under the control of frame_arg.  */
1196
      if (! MINI_WINDOW_P (XWINDOW (w))
Jim Blandy's avatar
Jim Blandy committed
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206
	  || (mini && minibuf_level > 0))
	switch (type)
	  {
	  case GET_BUFFER_WINDOW:
	    if (XBUFFER (XWINDOW (w)->buffer) == XBUFFER (obj))
	      return w;
	    break;

	  case GET_LRU_WINDOW:
	    /* t as arg means consider only full-width windows */
Jim Blandy's avatar
Jim Blandy committed
1207
	    if (!NILP (obj) && XFASTINT (XWINDOW (w)->width)
1208
		!= FRAME_WIDTH (XFRAME (WINDOW_FRAME (XWINDOW (w)))))
Jim Blandy's avatar
Jim Blandy committed
1209 1210 1211
	      break;
	    /* Ignore dedicated windows and minibuffers.  */
	    if (MINI_WINDOW_P (XWINDOW (w))
Jim Blandy's avatar
Jim Blandy committed
1212
		|| !NILP (XWINDOW (w)->dedicated))
Jim Blandy's avatar
Jim Blandy committed
1213
	      break;
Jim Blandy's avatar
Jim Blandy committed
1214
	    if (NILP (best_window)
Jim Blandy's avatar
Jim Blandy committed
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
		|| (XFASTINT (XWINDOW (best_window)->use_time)
		    > XFASTINT (XWINDOW (w)->use_time)))
	      best_window = w;
	    break;

	  case DELETE_OTHER_WINDOWS:
	    if (XWINDOW (w) != XWINDOW (obj))
	      Fdelete_window (w);
	    break;

	  case DELETE_BUFFER_WINDOWS:
	    if (EQ (XWINDOW (w)->buffer, obj))
	      {
		/* If we're deleting the buffer displayed in the only window
Jim Blandy's avatar
Jim Blandy committed
1229
		   on the frame, find a new buffer to display there.  */
Jim Blandy's avatar
Jim Blandy committed
1230
		if (NILP (XWINDOW (w)->parent))
Jim Blandy's avatar
Jim Blandy committed
1231
		  {
1232 1233
		    Lisp_Object