xdisp.c 124 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Display generation from window structure and buffer text.
Karl Heuer's avatar
Karl Heuer committed
2
   Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

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
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 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 24 25
#include <stdio.h>
/*#include <ctype.h>*/
#undef NULL
#include "lisp.h"
Jim Blandy's avatar
Jim Blandy committed
26
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
27 28 29 30 31 32 33 34
#include "window.h"
#include "termchar.h"
#include "dispextern.h"
#include "buffer.h"
#include "indent.h"
#include "commands.h"
#include "macros.h"
#include "disptab.h"
35
#include "termhooks.h"
36
#include "intervals.h"
Karl Heuer's avatar
Karl Heuer committed
37
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
38

39 40 41 42
#ifdef USE_X_TOOLKIT
extern void set_frame_menubar ();
#endif

Jim Blandy's avatar
Jim Blandy committed
43 44 45
extern int interrupt_input;
extern int command_loop_level;

46 47
extern Lisp_Object Qface;

48 49 50
extern Lisp_Object Voverriding_local_map;
extern Lisp_Object Voverriding_local_map_menu_flag;

51
Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
52

53
/* Nonzero means print newline to stdout before next minibuffer message.  */
Jim Blandy's avatar
Jim Blandy committed
54 55 56

int noninteractive_need_newline;

57 58
/* Nonzero means print newline to message log before next message.  */

59
static int message_log_need_newline;
60

Jim Blandy's avatar
Jim Blandy committed
61 62
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
Karl Heuer's avatar
Karl Heuer committed
63 64
#define minmax(floor, val, ceil) \
	((val) < (floor) ? (floor) : (val) > (ceil) ? (ceil) : (val))
Jim Blandy's avatar
Jim Blandy committed
65 66

/* The buffer position of the first character appearing
Jim Blandy's avatar
Jim Blandy committed
67 68
 entirely or partially on the current frame line.
 Or zero, which disables the optimization for the current frame line. */
Jim Blandy's avatar
Jim Blandy committed
69 70 71 72 73 74
static int this_line_bufpos;

/* Number of characters past the end of this line,
   including the terminating newline */
static int this_line_endpos;

Jim Blandy's avatar
Jim Blandy committed
75
/* The vertical position of this frame line. */
Jim Blandy's avatar
Jim Blandy committed
76 77
static int this_line_vpos;

Jim Blandy's avatar
Jim Blandy committed
78
/* Hpos value for start of display on this frame line.
Jim Blandy's avatar
Jim Blandy committed
79 80 81 82 83 84 85 86
   Usually zero, but negative if first character really began
   on previous line */
static int this_line_start_hpos;

/* Buffer that this_line variables are describing. */
static struct buffer *this_line_buffer;

/* Value of echo_area_glyphs when it was last acted on.
Jim Blandy's avatar
Jim Blandy committed
87
  If this is nonzero, there is a message on the frame
Jim Blandy's avatar
Jim Blandy committed
88 89 90 91
  in the minibuffer and it should be erased as soon
  as it is no longer requested to appear. */
char *previous_echo_glyphs;

Jim Blandy's avatar
Jim Blandy committed
92
/* Nonzero means truncate lines in all windows less wide than the frame */
Jim Blandy's avatar
Jim Blandy committed
93 94
int truncate_partial_width_windows;

95 96 97 98
/* Nonzero means we have more than one non-minibuffer-only frame.
   Not guaranteed to be accurate except while parsing frame-title-format.  */
int multiple_frames;

Jim Blandy's avatar
Jim Blandy committed
99 100 101 102 103 104 105 106
Lisp_Object Vglobal_mode_string;

/* Marker for where to display an arrow on top of the buffer text.  */
Lisp_Object Voverlay_arrow_position;

/* String to display for the arrow.  */
Lisp_Object Voverlay_arrow_string;

107 108 109 110 111 112
/* Like mode-line-format, but for the titlebar on a visible frame.  */
Lisp_Object Vframe_title_format;

/* Like mode-line-format, but for the titlebar on an iconified frame.  */
Lisp_Object Vicon_title_format;

113 114 115 116 117
/* List of functions to call when a window's size changes.  These
   functions get one arg, a frame on which one or more windows' sizes
   have changed.  */
static Lisp_Object Vwindow_size_change_functions;

Jim Blandy's avatar
Jim Blandy committed
118
/* Values of those variables at last redisplay.  */
119
static Lisp_Object last_arrow_position, last_arrow_string;
Jim Blandy's avatar
Jim Blandy committed
120

121 122
Lisp_Object Qmenu_bar_update_hook;

Jim Blandy's avatar
Jim Blandy committed
123 124 125
/* Nonzero if overlay arrow has been displayed once in this window.  */
static int overlay_arrow_seen;

Karl Heuer's avatar
Karl Heuer committed
126 127 128 129 130
/* Nonzero if visible end of buffer has already been displayed once
   in this window.  (We need this variable in case there are overlay
   strings that get displayed there.)  */
static int zv_strings_seen;

131 132 133
/* Nonzero means highlight the region even in nonselected windows.  */
static int highlight_nonselected_windows;

Jim Blandy's avatar
Jim Blandy committed
134
/* If cursor motion alone moves point off frame,
Jim Blandy's avatar
Jim Blandy committed
135
   Try scrolling this many lines up or down if that will bring it back.  */
136
static int scroll_step;
Jim Blandy's avatar
Jim Blandy committed
137 138 139 140 141

/* Nonzero if try_window_id has made blank lines at window bottom
 since the last redisplay that paused */
static int blank_end_of_window;

142 143
/* Number of windows showing the buffer of the selected window
   (or another buffer with the same base buffer).
Jim Blandy's avatar
Jim Blandy committed
144 145 146
   keyboard.c refers to this.  */
int buffer_shared;

Jim Blandy's avatar
Jim Blandy committed
147
/* display_text_line sets these to the frame position (origin 0) of point,
Jim Blandy's avatar
Jim Blandy committed
148 149 150 151 152 153
   whether the window is selected or not.
   Set one to -1 first to determine whether point was found afterwards.  */

static int cursor_vpos;
static int cursor_hpos;

154
static int debug_end_pos;
Jim Blandy's avatar
Jim Blandy committed
155 156 157 158

/* Nonzero means display mode line highlighted */
int mode_line_inverse_video;

159
static int message_log_check_duplicate ();
Jim Blandy's avatar
Jim Blandy committed
160 161 162 163
static void echo_area_display ();
void mark_window_display_accurate ();
static void redisplay_windows ();
static void redisplay_window ();
164
static void update_menu_bar ();
Jim Blandy's avatar
Jim Blandy committed
165 166 167 168 169 170 171
static void try_window ();
static int try_window_id ();
static struct position *display_text_line ();
static void display_mode_line ();
static int display_mode_element ();
static char *decode_mode_spec ();
static int display_string ();
172
static void display_menu_bar ();
173
static int display_count_lines ();
Jim Blandy's avatar
Jim Blandy committed
174 175

/* Prompt to display in front of the minibuffer contents */
176
Lisp_Object minibuf_prompt;
Jim Blandy's avatar
Jim Blandy committed
177 178 179 180 181 182 183 184 185 186

/* Width in columns of current minibuffer prompt.  */
int minibuf_prompt_width;

/* Message to display instead of minibuffer contents
   This is what the functions error and message make,
   and command echoing uses it as well.
   It overrides the minibuf_prompt as well as the buffer.  */
char *echo_area_glyphs;

187 188 189
/* This is the length of the message in echo_area_glyphs.  */
int echo_area_glyphs_length;

190 191 192 193 194
/* This is the window where the echo area message was displayed.
   It is always a minibuffer window, but it may not be the
   same window currently active as a minibuffer.  */
Lisp_Object echo_area_window;

Jim Blandy's avatar
Jim Blandy committed
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216
/* true iff we should redraw the mode lines on the next redisplay */
int update_mode_lines;

/* Smallest number of characters before the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int beg_unchanged;

/* Smallest number of characters after the gap
   at any time since last redisplay that finished.
   Valid for current buffer when try_window_id can be called.  */
int end_unchanged;

/* MODIFF as of last redisplay that finished;
   if it matches MODIFF, beg_unchanged and end_unchanged
   contain no useful information */
int unchanged_modified;

/* Nonzero if window sizes or contents have changed
   since last redisplay that finished */
int windows_or_buffers_changed;

217 218 219 220 221
/* Nonzero after display_mode_line if %l was used
   and it displayed a line number.  */
int line_number_displayed;

/* Maximum buffer size for which to display line numbers.  */
222
static int line_number_display_limit;
Karl Heuer's avatar
Karl Heuer committed
223 224 225 226

/* Number of lines to keep in the message log buffer.
   t means infinite.  nil means don't log at all.  */
Lisp_Object Vmessage_log_max;
Jim Blandy's avatar
Jim Blandy committed
227

228 229 230 231 232 233 234 235
void
message_log_maybe_newline ()
{
  if (message_log_need_newline)
    message_dolog ("", 0, 1);
}


236 237 238
/* Add a string to the message log, optionally terminated with a newline.
   This function calls low-level routines in order to bypass text property
   hooks, etc. which might not be safe to run.  */
239 240

void
241
message_dolog (m, len, nlflag)
242
     char *m;
243
     int len, nlflag;
Karl Heuer's avatar
Karl Heuer committed
244
{
245
  if (!NILP (Vmessage_log_max))
Karl Heuer's avatar
Karl Heuer committed
246 247 248 249 250
    {
      struct buffer *oldbuf;
      int oldpoint, oldbegv, oldzv;

      oldbuf = current_buffer;
251
      Fset_buffer (Fget_buffer_create (build_string ("*Messages*")));
252
      current_buffer->undo_list = Qt;
Karl Heuer's avatar
Karl Heuer committed
253 254 255
      oldpoint = PT;
      oldbegv = BEGV;
      oldzv = ZV;
256 257
      BEGV = BEG;
      ZV = Z;
Karl Heuer's avatar
Karl Heuer committed
258
      if (oldpoint == Z)
259
	oldpoint += len + nlflag;
Karl Heuer's avatar
Karl Heuer committed
260
      if (oldzv == Z)
261
	oldzv += len + nlflag;
Karl Heuer's avatar
Karl Heuer committed
262
      TEMP_SET_PT (Z);
263 264 265
      if (len)
	insert_1 (m, len, 1, 0);
      if (nlflag)
Karl Heuer's avatar
Karl Heuer committed
266
	{
267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
	  int this_bol, prev_bol, dup;
	  insert_1 ("\n", 1, 1, 0);

	  this_bol = scan_buffer ('\n', Z, 0, -2, 0, 0);
	  if (this_bol > BEG)
	    {
	      prev_bol = scan_buffer ('\n', this_bol, 0, -2, 0, 0);
	      dup = message_log_check_duplicate (prev_bol, this_bol);
	      if (dup)
		{
		  if (oldpoint > prev_bol)
		    oldpoint -= min (this_bol, oldpoint) - prev_bol;
		  if (oldbegv > prev_bol)
		    oldbegv -= min (this_bol, oldbegv) - prev_bol;
		  if (oldzv > prev_bol)
		    oldzv -= min (this_bol, oldzv) - prev_bol;
		  del_range_1 (prev_bol, this_bol, 0);
		  if (dup > 1)
		    {
		      char dupstr[40];
		      int duplen;

		      /* If you change this format, don't forget to also
			 change message_log_check_duplicate.  */
		      sprintf (dupstr, " [%d times]", dup);
		      duplen = strlen (dupstr);
		      TEMP_SET_PT (Z-1);
		      if (oldpoint == Z)
			oldpoint += duplen;
		      if (oldzv == Z)
			oldzv += duplen;
		      insert_1 (dupstr, duplen, 1, 0);
		    }
		}
	    }

	  if (NATNUMP (Vmessage_log_max))
	    {
	      int pos = scan_buffer ('\n', Z, 0,
				     -XFASTINT (Vmessage_log_max) - 1, 0, 0);
	      oldpoint -= min (pos, oldpoint) - BEG;
	      oldbegv -= min (pos, oldbegv) - BEG;
	      oldzv -= min (pos, oldzv) - BEG;
	      del_range_1 (BEG, pos, 0);
	    }
Karl Heuer's avatar
Karl Heuer committed
312 313 314 315 316
	}
      BEGV = oldbegv;
      ZV = oldzv;
      TEMP_SET_PT (oldpoint);
      set_buffer_internal (oldbuf);
317
      message_log_need_newline = !nlflag;
Karl Heuer's avatar
Karl Heuer committed
318
    }
319 320 321
}


322 323 324 325 326
/* We are at the end of the buffer after just having inserted a newline.
   (Note: We depend on the fact we won't be crossing the gap.)
   Check to see if the most recent message looks a lot like the previous one.
   Return 0 if different, 1 if the new one should just replace it, or a
   value N > 1 if we should also append " [N times]".  */
327

328 329 330 331 332 333 334
static int
message_log_check_duplicate (prev_bol, this_bol)
     int prev_bol, this_bol;
{
  int i;
  int len = Z - 1 - this_bol;
  int seen_dots = 0;
335 336
  unsigned char *p1 = BUF_CHAR_ADDRESS (current_buffer, prev_bol);
  unsigned char *p2 = BUF_CHAR_ADDRESS (current_buffer, this_bol);
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359

  for (i = 0; i < len; i++)
    {
      if (i >= 3 && p1[i-3] == '.' && p1[i-2] == '.' && p1[i-1] == '.'
	  && p1[i] != '\n')
	seen_dots = 1;
      if (p1[i] != p2[i])
	return seen_dots;
    }
  p1 += len;
  if (*p1 == '\n')
    return 2;
  if (*p1++ == ' ' && *p1++ == '[')
    {
      int n = 0;
      while (*p1 >= '0' && *p1 <= '9')
	n = n * 10 + *p1++ - '0';
      if (strncmp (p1, " times]\n", 8) == 0)
	return n+1;
    }
  return 0;
}

360 361 362 363 364 365 366 367 368 369 370
/* Display an echo area message M with a specified length of LEN chars.
   The string may include null characters.  If m is 0, clear out any
   existing message, and let the minibuffer text show through.
   Do not pass text that is stored in a Lisp string.  */

void
message2 (m, len)
     char *m;
     int len;
{
  /* First flush out any partial line written with print.  */
371
  message_log_maybe_newline ();
372 373
  if (m)
    message_dolog (m, len, 1);
Karl Heuer's avatar
Karl Heuer committed
374 375 376 377 378 379 380 381 382 383
  message2_nolog (m, len);
}


/* The non-logging part of that function.  */

void
message2_nolog (m, len)
     char *m;
     int len;
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
{
  if (noninteractive)
    {
      if (noninteractive_need_newline)
	putc ('\n', stderr);
      noninteractive_need_newline = 0;
      fwrite (m, len, 1, stderr);
      if (cursor_in_echo_area == 0)
	fprintf (stderr, "\n");
      fflush (stderr);
    }
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  else if (INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    {
400 401
      Lisp_Object mini_window;
      FRAME_PTR f;
402

403 404 405 406 407 408 409
      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));

#ifdef MULTI_FRAME
      FRAME_SAMPLE_VISIBILITY (f);
410
      if (FRAME_VISIBLE_P (selected_frame)
411 412
	  && ! FRAME_VISIBLE_P (f))
	Fmake_frame_visible (WINDOW_FRAME (XWINDOW (mini_window)));
413 414 415 416 417 418 419
#endif

      if (m)
	{
	  echo_area_glyphs = m;
	  echo_area_glyphs_length = len;
	}
420 421 422 423 424
      else
	echo_area_glyphs = previous_echo_glyphs = 0;

      do_pending_window_change ();
      echo_area_display ();
425
      update_frame (f, 1, 1);
426
      do_pending_window_change ();
427
      if (frame_up_to_date_hook != 0 && ! gc_in_progress)
428
	(*frame_up_to_date_hook) (f);
429 430 431
    }
}

432 433 434 435 436 437 438
void
message1 (m)
     char *m;
{
  message2 (m, (m ? strlen (m) : 0));
}

Karl Heuer's avatar
Karl Heuer committed
439 440 441 442 443 444 445
void
message1_nolog (m)
     char *m;
{
  message2_nolog (m, (m ? strlen (m) : 0));
}

446 447 448 449 450 451 452 453 454 455 456 457 458 459
/* Truncate what will be displayed in the echo area
   the next time we display it--but don't redisplay it now.  */

void
truncate_echo_area (len)
     int len;
{
  /* A null message buffer means that the frame hasn't really been
     initialized yet.  Error messages get reported properly by
     cmd_error, so this must be just an informative message; toss it.  */
  if (!noninteractive && INTERACTIVE && FRAME_MESSAGE_BUF (selected_frame))
    echo_area_glyphs_length = len;
}

Jim Blandy's avatar
Jim Blandy committed
460
/* Nonzero if FRAME_MESSAGE_BUF (selected_frame) is being used by print;
Jim Blandy's avatar
Jim Blandy committed
461 462 463
   zero if being used by message.  */
int message_buf_print;

464 465
/* Dump an informative message to the minibuf.  If m is 0, clear out
   any existing message, and let the minibuffer text show through.  */
Jim Blandy's avatar
Jim Blandy committed
466 467 468 469
/* VARARGS 1 */
void
message (m, a1, a2, a3)
     char *m;
470
     EMACS_INT a1, a2, a3;
Jim Blandy's avatar
Jim Blandy committed
471 472 473
{
  if (noninteractive)
    {
474 475 476 477 478 479
      if (m)
	{
	  if (noninteractive_need_newline)
	    putc ('\n', stderr);
	  noninteractive_need_newline = 0;
	  fprintf (stderr, m, a1, a2, a3);
480 481
	  if (cursor_in_echo_area == 0)
	    fprintf (stderr, "\n");
482 483
	  fflush (stderr);
	}
Jim Blandy's avatar
Jim Blandy committed
484
    }
485
  else if (INTERACTIVE)
Jim Blandy's avatar
Jim Blandy committed
486
    {
487 488 489
      /* The frame whose minibuffer we're going to display the message on.
	 It may be larger than the selected frame, so we need
	 to use its buffer, not the selected frame's buffer.  */
490 491 492 493 494 495 496
      Lisp_Object mini_window;
      FRAME_PTR f;

      /* Get the frame containing the minibuffer
	 that the selected frame is using.  */
      mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
      f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
497 498 499 500

      /* A null message buffer means that the frame hasn't really been
	 initialized yet.  Error messages get reported properly by
	 cmd_error, so this must be just an informative message; toss it.  */
501
      if (FRAME_MESSAGE_BUF (f))
502
	{
503 504
	  if (m)
	    {
505
	      int len;
Jim Blandy's avatar
Jim Blandy committed
506
#ifdef NO_ARG_ARRAY
507
	      EMACS_INT a[3];
508 509 510
	      a[0] = a1;
	      a[1] = a2;
	      a[2] = a3;
Jim Blandy's avatar
Jim Blandy committed
511

512 513
	      len = doprnt (FRAME_MESSAGE_BUF (f),
			    FRAME_WIDTH (f), m, (char *)0, 3, a);
Jim Blandy's avatar
Jim Blandy committed
514
#else
515 516
	      len = doprnt (FRAME_MESSAGE_BUF (f),
			    FRAME_WIDTH (f), m, (char *)0, 3, &a1);
517 518
#endif /* NO_ARG_ARRAY */

519
	      message2 (FRAME_MESSAGE_BUF (f), len);
520 521 522 523 524 525 526
	    }
	  else
	    message1 (0);

	  /* Print should start at the beginning of the message
	     buffer next time.  */
	  message_buf_print = 0;
527
	}
Jim Blandy's avatar
Jim Blandy committed
528 529 530
    }
}

Karl Heuer's avatar
Karl Heuer committed
531 532 533 534 535 536 537 538 539 540 541 542 543
/* The non-logging version of that function.  */
void
message_nolog (m, a1, a2, a3)
     char *m;
     EMACS_INT a1, a2, a3;
{
  Lisp_Object old_log_max;
  old_log_max = Vmessage_log_max;
  Vmessage_log_max = Qnil;
  message (m, a1, a2, a3);
  Vmessage_log_max = old_log_max;
}

544 545 546 547 548 549
void
update_echo_area ()
{
  message2 (echo_area_glyphs, echo_area_glyphs_length);
}

Jim Blandy's avatar
Jim Blandy committed
550 551 552 553
static void
echo_area_display ()
{
  register int vpos;
Jim Blandy's avatar
Jim Blandy committed
554
  FRAME_PTR f;
555
  Lisp_Object mini_window;
Jim Blandy's avatar
Jim Blandy committed
556

557 558 559 560 561
  /* Choose the minibuffer window for this display.
     It is the minibuffer window used by the selected frame.  */
  mini_window = FRAME_MINIBUF_WINDOW (selected_frame);
  /* This is the frame that window is in.  */
  f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window)));
Jim Blandy's avatar
Jim Blandy committed
562

Jim Blandy's avatar
Jim Blandy committed
563
  if (! FRAME_VISIBLE_P (f))
Jim Blandy's avatar
Jim Blandy committed
564 565
    return;

Jim Blandy's avatar
Jim Blandy committed
566
  if (frame_garbaged)
Jim Blandy's avatar
Jim Blandy committed
567
    {
568
      redraw_garbaged_frames ();
Jim Blandy's avatar
Jim Blandy committed
569
      frame_garbaged = 0;
Jim Blandy's avatar
Jim Blandy committed
570 571 572 573
    }

  if (echo_area_glyphs || minibuf_level == 0)
    {
574 575 576
      echo_area_window = mini_window;

      vpos = XFASTINT (XWINDOW (mini_window)->top);
Jim Blandy's avatar
Jim Blandy committed
577
      get_display_line (f, vpos, 0);
578
      display_string (XWINDOW (mini_window), vpos,
Jim Blandy's avatar
Jim Blandy committed
579
		      echo_area_glyphs ? echo_area_glyphs : "",
580
		      echo_area_glyphs ? echo_area_glyphs_length : -1,
581
		      0, 0, 0, 0, FRAME_WIDTH (f));
Jim Blandy's avatar
Jim Blandy committed
582

583
#if 0 /* This just gets in the way.  update_frame does the job.  */
Jim Blandy's avatar
Jim Blandy committed
584
      /* If desired cursor location is on this line, put it at end of text */
585 586
      if (cursor_in_echo_area)
	FRAME_CURSOR_Y (f) = vpos;
Jim Blandy's avatar
Jim Blandy committed
587 588
      if (FRAME_CURSOR_Y (f) == vpos)
	FRAME_CURSOR_X (f) = FRAME_DESIRED_GLYPHS (f)->used[vpos];
589
#endif
Jim Blandy's avatar
Jim Blandy committed
590 591 592 593 594

      /* Fill the rest of the minibuffer window with blank lines.  */
      {
	int i;

595
	for (i = vpos + 1;
596
	     i < vpos + XFASTINT (XWINDOW (mini_window)->height); i++)
Jim Blandy's avatar
Jim Blandy committed
597
	  {
Jim Blandy's avatar
Jim Blandy committed
598
	    get_display_line (f, i, 0);
599
	    display_string (XWINDOW (mini_window), vpos,
600
			    "", 0, 0, 0, 0, 0, FRAME_WIDTH (f));
Jim Blandy's avatar
Jim Blandy committed
601 602
	  }
      }
Jim Blandy's avatar
Jim Blandy committed
603
    }
604
  else if (!EQ (mini_window, selected_window))
Jim Blandy's avatar
Jim Blandy committed
605 606
    windows_or_buffers_changed++;

607
  if (EQ (mini_window, selected_window))
Jim Blandy's avatar
Jim Blandy committed
608 609 610 611
    this_line_bufpos = 0;

  previous_echo_glyphs = echo_area_glyphs;
}
612 613

#ifdef HAVE_X_WINDOWS
614 615
static char frame_title_buf[512];
static char *frame_title_ptr;
616

617 618 619 620 621 622 623 624 625 626 627 628 629 630 631
static int
store_frame_title (str, mincol, maxcol)
     char *str;
     int mincol, maxcol;
{
  char *limit;
  if (maxcol < 0 || maxcol >= sizeof(frame_title_buf))
    maxcol = sizeof (frame_title_buf);
  limit = &frame_title_buf[maxcol];
  while (*str != '\0' && frame_title_ptr < limit)
    *frame_title_ptr++ = *str++;
  while (frame_title_ptr < &frame_title_buf[mincol])
    *frame_title_ptr++ = ' ';
  return frame_title_ptr - frame_title_buf;
}
632 633 634 635 636

static void
x_consider_frame_title (frame)
     Lisp_Object frame;
{
637 638 639
  Lisp_Object fmt;
  struct buffer *obuf;
  int len;
640 641
  FRAME_PTR f = XFRAME (frame);

642 643
  if (!FRAME_X_P (f) || FRAME_MINIBUF_ONLY_P (f) || f->explicit_name)
    return;
644 645 646 647 648 649 650 651 652

  /* Do we have more than one visible frame on this X display?  */
  {
    Lisp_Object tail;

    for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
      {
	FRAME_PTR tf = XFRAME (XCONS (tail)->car);

653 654
	if (tf != f && FRAME_KBOARD (tf) == FRAME_KBOARD (f)
	    && !FRAME_MINIBUF_ONLY_P (tf)
655 656 657 658 659 660 661
	    && (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf)))
	  break;
      }

    multiple_frames = CONSP (tail);
  }

662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
  obuf = current_buffer;
  Fset_buffer (XWINDOW (f->selected_window)->buffer);
  fmt = (FRAME_ICONIFIED_P (f) ? Vicon_title_format : Vframe_title_format);
  frame_title_ptr = frame_title_buf;
  len = display_mode_element (XWINDOW (f->selected_window), 0, 0, 0,
			      0, sizeof (frame_title_buf), fmt);
  frame_title_ptr = 0;
  set_buffer_internal (obuf);
  /* Set the name only if it's changed.  This avoids consing
     in the common case where it hasn't.  (If it turns out that we've
     already wasted too much time by walking through the list with
     display_mode_element, then we might need to optimize at a higher
     level than this.)  */
  if (! STRINGP (f->name) || XSTRING (f->name)->size != len
      || bcmp (frame_title_buf, XSTRING (f->name)->data, len) != 0)
    x_implicitly_set_name (f, make_string (frame_title_buf, len), Qnil);
678
}
679 680
#else
#define frame_title_ptr ((char *)0)
681
#define store_frame_title(str, mincol, maxcol) 0
682
#endif
Jim Blandy's avatar
Jim Blandy committed
683

684
/* Prepare for redisplay by updating menu-bar item lists when appropriate.
Richard M. Stallman's avatar
Richard M. Stallman committed
685
   This can call eval.  */
686 687 688 689 690 691

void
prepare_menu_bars ()
{
  register struct window *w = XWINDOW (selected_window);
  int all_windows;
692
  struct gcpro gcpro1, gcpro2;
693

694
  all_windows = (update_mode_lines || buffer_shared > 1
695
		 || windows_or_buffers_changed);
696

697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
  /* Update all frame titles based on their buffer names, etc.
     We do this before the menu bars so that the buffer-menu
     will show the up-to-date frame titles.

     This used to be done after the menu bars, for a reason that
     was stated as follows but which I do not understand:
     "We do this after the menu bars so that the frame will first
     create its menu bar using the name `emacs' if no other name
     has yet been specified."
     I think that is no longer a concern.  */
#ifdef HAVE_X_WINDOWS
  if (windows_or_buffers_changed)
    {
      Lisp_Object tail, frame;

      FOR_EACH_FRAME (tail, frame)
	if (FRAME_VISIBLE_P (XFRAME (frame))
	    || FRAME_ICONIFIED_P (XFRAME (frame)))
	  x_consider_frame_title (frame);
    }
#endif

719 720 721 722 723 724
  /* Update the menu bar item lists, if appropriate.
     This has to be done before any actual redisplay
     or generation of display lines.  */
  if (all_windows)
    {
      Lisp_Object tail, frame;
725 726 727
      int count = specpdl_ptr - specpdl;

      record_unwind_protect (Fstore_match_data, Fmatch_data ());
728 729

      FOR_EACH_FRAME (tail, frame)
730 731 732 733 734 735
	{
	  /* If a window on this frame changed size,
	     report that to the user and clear the size-change flag.  */
	  if (FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)))
	    {
	      Lisp_Object functions;
736 737
	      /* Clear flag first in case we get error below.  */
	      FRAME_WINDOW_SIZES_CHANGED (XFRAME (frame)) = 0;
738 739 740 741 742 743 744 745 746 747
	      functions = Vwindow_size_change_functions;
	      GCPRO2 (tail, functions);
	      while (CONSP (functions))
		{
		  call1 (XCONS (functions)->car, frame);
		  functions = XCONS (functions)->cdr;
		}
	      UNGCPRO;
	    }
	  GCPRO1 (tail);
748
	  update_menu_bar (XFRAME (frame), 0);
749 750
	  UNGCPRO;
	}
751 752

      unbind_to (count, Qnil);
753
    }
754
  else
755
    update_menu_bar (selected_frame, 1);
756 757
}

Jim Blandy's avatar
Jim Blandy committed
758
/* Do a frame update, taking possible shortcuts into account.
Jim Blandy's avatar
Jim Blandy committed
759 760 761 762 763 764
   This is the main external entry point for redisplay.

   If the last redisplay displayed an echo area message and that
   message is no longer requested, we clear the echo area
   or bring back the minibuffer if that is in use.

765 766 767 768 769 770
   Do not call eval from within this function.
   Calls to eval after the call to echo_area_display would confuse
   the display_line mechanism and would cause a crash.
   Calls to eval before that point will work most of the time,
   but can still lose, because  this function
   can be called from signal handlers; with alarms set up;
Jim Blandy's avatar
Jim Blandy committed
771
   or with synchronous processes running.
772

Jim Blandy's avatar
Jim Blandy committed
773 774 775
   See Fcall_process; if you called it from here, it could be
   entered recursively.  */

776 777
static int do_verify_charstarts;

778 779 780 781
/* Counter is used to clear the face cache
   no more than once ever 1000 redisplays.  */
static int clear_face_cache_count;

Jim Blandy's avatar
Jim Blandy committed
782 783 784 785 786 787 788 789 790 791 792 793 794
void
redisplay ()
{
  register struct window *w = XWINDOW (selected_window);
  register int pause;
  int must_finish = 0;
  int all_windows;
  register int tlbufpos, tlendpos;
  struct position pos;

  if (noninteractive)
    return;

795 796 797 798 799
  /* Set the visible flags for all frames.
     Do this before checking for resized or garbaged frames; they want
     to know if their frames are visible.
     See the comment in frame.h for FRAME_SAMPLE_VISIBILITY.  */
  {
800
    Lisp_Object tail, frame;
801

802
    FOR_EACH_FRAME (tail, frame)
803 804 805 806 807 808 809
      {
	FRAME_SAMPLE_VISIBILITY (XFRAME (frame));

	/* Clear out all the display lines in which we will generate the
	   glyphs to display.  */
	init_desired_glyphs (XFRAME (frame));
      }
810 811
  }

Jim Blandy's avatar
Jim Blandy committed
812
  /* Notice any pending interrupt request to change frame size.  */
Jim Blandy's avatar
Jim Blandy committed
813 814
  do_pending_window_change ();

Jim Blandy's avatar
Jim Blandy committed
815
  if (frame_garbaged)
Jim Blandy's avatar
Jim Blandy committed
816
    {
817
      redraw_garbaged_frames ();
Jim Blandy's avatar
Jim Blandy committed
818
      frame_garbaged = 0;
Jim Blandy's avatar
Jim Blandy committed
819 820
    }

821 822
  prepare_menu_bars ();

823
  if (windows_or_buffers_changed)
Jim Blandy's avatar
Jim Blandy committed
824 825 826 827
    update_mode_lines++;

  /* Detect case that we need to write a star in the mode line.  */
  if (XFASTINT (w->last_modified) < MODIFF
828
      && XFASTINT (w->last_modified) <= SAVE_MODIFF)
Jim Blandy's avatar
Jim Blandy committed
829 830 831 832 833 834
    {
      w->update_mode_line = Qt;
      if (buffer_shared > 1)
	update_mode_lines++;
    }

835 836 837 838 839 840 841 842 843
  /* If %c is in use, update it if needed.  */
  if (!NILP (w->column_number_displayed)
      /* This alternative quickly identifies a common case
	 where no change is needed.  */
      && !(PT == XFASTINT (w->last_point)
	   && XFASTINT (w->last_modified) >= MODIFF)
      && XFASTINT (w->column_number_displayed) != current_column ())
    w->update_mode_line = Qt; 

Jim Blandy's avatar
Jim Blandy committed
844
  FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w->frame)) = -1;
Jim Blandy's avatar
Jim Blandy committed
845 846 847 848 849

  all_windows = update_mode_lines || buffer_shared > 1;

  /* If specs for an arrow have changed, do thorough redisplay
     to ensure we remove any arrow that should no longer exist.  */
850 851
  if (! EQ (Voverlay_arrow_position, last_arrow_position)
      || ! EQ (Voverlay_arrow_string, last_arrow_string))
852
    all_windows = 1;
Jim Blandy's avatar
Jim Blandy committed
853

854 855 856 857 858 859 860 861 862 863
  /* Normally the message* functions will have already displayed and
     updated the echo area, but the frame may have been trashed, or
     the update may have been preempted, so display the echo area
     again here.  */
  if (echo_area_glyphs || previous_echo_glyphs)
    {
      echo_area_display ();
      must_finish = 1;
    }

864 865 866 867
  /* If showing region, and mark has changed, must redisplay whole window.  */
  if (((!NILP (Vtransient_mark_mode)
	&& !NILP (XBUFFER (w->buffer)->mark_active))
       != !NILP (w->region_showing))
868 869 870
      || (!NILP (w->region_showing)
	  && !EQ (w->region_showing,
		  Fmarker_position (XBUFFER (w->buffer)->mark))))
871 872
    this_line_bufpos = -1;

Jim Blandy's avatar
Jim Blandy committed
873 874
  tlbufpos = this_line_bufpos;
  tlendpos = this_line_endpos;
Jim Blandy's avatar
Jim Blandy committed
875
  if (!all_windows && tlbufpos > 0 && NILP (w->update_mode_line)
876
      && !current_buffer->clip_changed
Jim Blandy's avatar
Jim Blandy committed
877
      && FRAME_VISIBLE_P (XFRAME (w->frame))
Jim Blandy's avatar
Jim Blandy committed
878 879 880
      /* Make sure recorded data applies to current buffer, etc */
      && this_line_buffer == current_buffer
      && current_buffer == XBUFFER (w->buffer)
Jim Blandy's avatar
Jim Blandy committed
881
      && NILP (w->force_start)
Jim Blandy's avatar
Jim Blandy committed
882
      /* Point must be on the line that we have info recorded about */
Karl Heuer's avatar
Karl Heuer committed
883 884
      && PT >= tlbufpos
      && PT <= Z - tlendpos
Jim Blandy's avatar
Jim Blandy committed
885 886 887 888 889
      /* All text outside that line, including its final newline,
	 must be unchanged */
      && (XFASTINT (w->last_modified) >= MODIFF
	  || (beg_unchanged >= tlbufpos - 1
	      && GPT >= tlbufpos
Jim Blandy's avatar
Jim Blandy committed
890 891
	      /* If selective display, can't optimize
		 if the changes start at the beginning of the line.  */
892
	      && ((INTEGERP (current_buffer->selective_display)
Jim Blandy's avatar
Jim Blandy committed
893 894 895 896
		   && XINT (current_buffer->selective_display) > 0
		   ? (beg_unchanged >= tlbufpos
		      && GPT > tlbufpos)
		   : 1))
Jim Blandy's avatar
Jim Blandy committed
897 898 899 900 901 902 903 904 905 906 907 908 909
	      && end_unchanged >= tlendpos
	      && Z - GPT >= tlendpos)))
    {
      if (tlbufpos > BEGV && FETCH_CHAR (tlbufpos - 1) != '\n'
	  && (tlbufpos == ZV
	      || FETCH_CHAR (tlbufpos) == '\n'))
	/* Former continuation line has disappeared by becoming empty */
	goto cancel;
      else if (XFASTINT (w->last_modified) < MODIFF
	       || MINI_WINDOW_P (w))
	{
	  cursor_vpos = -1;
	  overlay_arrow_seen = 0;
Karl Heuer's avatar
Karl Heuer committed
910
	  zv_strings_seen = 0;
Jim Blandy's avatar
Jim Blandy committed
911 912 913 914 915 916 917
	  display_text_line (w, tlbufpos, this_line_vpos, this_line_start_hpos,
			     pos_tab_offset (w, tlbufpos));
	  /* If line contains point, is not continued,
		 and ends at same distance from eob as before, we win */
	  if (cursor_vpos >= 0 && this_line_bufpos
	      && this_line_endpos == tlendpos)
	    {
918 919 920 921
	      /* If this is not the window's last line,
		 we must adjust the charstarts of the lines below.  */
	      if (this_line_vpos + 1
		  < XFASTINT (w->top) + window_internal_height (w))
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
		{
		  int left = XFASTINT (w->left);
		  int *charstart_next_line
		    = FRAME_CURRENT_GLYPHS (XFRAME (WINDOW_FRAME (w)))->charstarts[this_line_vpos + 1];
		  int adjust;

		  if (Z - tlendpos == ZV)
		    /* This line ends at end of (accessible part of) buffer.
		       There is no newline to count.  */
		    adjust = Z - tlendpos - charstart_next_line[left];
		  else
		    /* This line ends in a newline.
		       Must take account of the newline and the rest of the
		       text that follows.  */
		    adjust = Z - tlendpos + 1 - charstart_next_line[left];

		  adjust_window_charstarts (w, this_line_vpos, adjust);
		}
940

Jim Blandy's avatar
Jim Blandy committed
941
	      if (XFASTINT (w->width) != FRAME_WIDTH (XFRAME (WINDOW_FRAME (w))))
Jim Blandy's avatar
Jim Blandy committed
942 943 944 945 946 947
		preserve_other_columns (w);
	      goto update;
	    }
	  else
	    goto cancel;
	}
948 949 950 951 952 953
      else if (PT == XFASTINT (w->last_point)
	       /* Make sure the cursor was last displayed
		  in this window.  Otherwise we have to reposition it.  */
	       && XINT (w->top) <= FRAME_CURSOR_Y (selected_frame)
	       && (XINT (w->top) + XINT (w->height)
		   > FRAME_CURSOR_Y (selected_frame)))
Jim Blandy's avatar
Jim Blandy committed
954 955 956 957 958 959 960 961
	{
	  if (!must_finish)
	    {
	      do_pending_window_change ();
	      return;
	    }
	  goto update;
	}
962 963
      /* If highlighting the region, or if the cursor is in the echo area,
	 then we can't just move the cursor.  */
964 965
      else if (! (!NILP (Vtransient_mark_mode)
		  && !NILP (current_buffer->mark_active))
966 967
	       && NILP (w->region_showing)
	       && !cursor_in_echo_area)
Jim Blandy's avatar
Jim Blandy committed
968 969 970
	{
	  pos = *compute_motion (tlbufpos, 0,
				 XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0,
Karl Heuer's avatar
Karl Heuer committed
971
				 0,
Karl Heuer's avatar
Karl Heuer committed
972
				 PT, 2, - (1 << (SHORTBITS - 1)),
973
				 window_internal_width (w) - 1,
Jim Blandy's avatar
Jim Blandy committed
974
				 XINT (w->hscroll),
975
				 pos_tab_offset (w, tlbufpos), w);
Jim Blandy's avatar
Jim Blandy committed
976 977
	  if (pos.vpos < 1)
	    {
Karl Heuer's avatar
Karl Heuer committed
978
	      int width = window_internal_width (w) - 1;
Jim Blandy's avatar
Jim Blandy committed
979
	      FRAME_CURSOR_X (selected_frame)
Karl Heuer's avatar
Karl Heuer committed
980
		= XFASTINT (w->left) + minmax (0, pos.hpos, width);
Jim Blandy's avatar
Jim Blandy committed
981
	      FRAME_CURSOR_Y (selected_frame) = this_line_vpos;
Jim Blandy's avatar
Jim Blandy committed
982 983 984 985 986 987 988
	      goto update;
	    }
	  else
	    goto cancel;
	}
    cancel:
      /* Text changed drastically or point moved off of line */
Jim Blandy's avatar
Jim Blandy committed
989
      cancel_line (this_line_vpos, selected_frame);
Jim Blandy's avatar
Jim Blandy committed
990 991 992 993 994
    }

  this_line_bufpos = 0;
  all_windows |= buffer_shared > 1;

995 996
  clear_face_cache_count++;

Jim Blandy's avatar
Jim Blandy committed
997 998
  if (all_windows)
    {
999
      Lisp_Object tail, frame;
Jim Blandy's avatar
Jim Blandy committed
1000

Morten Welinder's avatar
Morten Welinder committed
1001
#ifdef HAVE_FACES
1002 1003 1004 1005 1006 1007 1008
      /* Clear the face cache, only when we do a full redisplay
	 and not too often either.  */
      if (clear_face_cache_count > 1000)
	{
	  clear_face_cache ();
	  clear_face_cache_count = 0;
	}
1009 1010
#endif

Jim Blandy's avatar
Jim Blandy committed
1011
      /* Recompute # windows showing selected buffer.
Jim Blandy's avatar
Jim Blandy committed
1012
	 This will be incremented each time such a window is displayed.  */
Jim Blandy's avatar
Jim Blandy committed
1013 1014
      buffer_shared = 0;

1015
      FOR_EACH_FRAME (tail, frame)
1016
	{
1017
	  FRAME_PTR f = XFRAME (frame);
1018 1019
	  if (! FRAME_TERMCAP_P (f) || f == selected_frame)
	    {
1020

1021 1022 1023 1024
	      /* Mark all the scroll bars to be removed; we'll redeem the ones
		 we want when we redisplay their windows.  */
	      if (condemn_scroll_bars_hook)
		(*condemn_scroll_bars_hook) (f);
1025

1026 1027
	      if (FRAME_VISIBLE_P (f))
		redisplay_windows (FRAME_ROOT_WINDOW (f));
1028

1029 1030 1031 1032 1033
	      /* Any scroll bars which redisplay_windows should have nuked
		 should now go away.  */
	      if (judge_scroll_bars_hook)
		(*judge_scroll_bars_hook) (f);
	    }
1034
	}
Jim Blandy's avatar
Jim Blandy committed
1035
    }
Jim Blandy's avatar
Jim Blandy committed
1036
  else if (FRAME_VISIBLE_P (selected_frame))
Jim Blandy's avatar
Jim Blandy committed
1037 1038
    {
      redisplay_window (selected_window, 1);
Jim Blandy's avatar
Jim Blandy committed
1039
      if (XFASTINT (w->width) != FRAME_WIDTH (selected_frame))
Jim Blandy's avatar
Jim Blandy committed
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
	preserve_other_columns (w);
    }

update: 
  /* Prevent various kinds of signals during display update.
     stdio is not robust about handling signals,
     which can cause an apparent I/O error.  */
  if (interrupt_input)
    unrequest_sigio ();
  stop_polling ();

Jim Blandy's avatar
Jim Blandy committed
1051
#ifdef MULTI_FRAME
Jim Blandy's avatar
Jim Blandy committed
1052 1053 1054 1055 1056 1057
  if (all_windows)
    {
      Lisp_Object tail;

      pause = 0;

Jim Blandy's avatar
Jim Blandy committed
1058
      for (tail = Vframe_list; CONSP (tail); tail = XCONS (tail)->cdr)
Jim Blandy's avatar
Jim Blandy committed
1059
	{
Jim Blandy's avatar
Jim Blandy committed
1060
	  FRAME_PTR f;
Jim Blandy's avatar
Jim Blandy committed
1061

1062
	  if (!FRAMEP (XCONS (tail)->car))
Jim Blandy's avatar
Jim Blandy committed
1063 1064
	    continue;

Jim Blandy's avatar
Jim Blandy committed
1065
	  f = XFRAME (XCONS (tail)->car);
1066 1067 1068

	  if ((! FRAME_TERMCAP_P (f) || f == selected_frame)
	      && FRAME_VISIBLE_P (f))
Jim Blandy's avatar
Jim Blandy committed
1069
	    {
Jim Blandy's avatar
Jim Blandy committed
1070
	      pause |= update_frame (f, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
1071
	      if (!pause)
1072 1073 1074 1075 1076
		{
		  mark_window_display_accurate (f->root_window, 1);
		  if (frame_up_to_date_hook != 0)
		    (*frame_up_to_date_hook) (f);
		}
Jim Blandy's avatar
Jim Blandy committed
1077 1078 1079 1080
	    }