buffer.c 83.3 KB
Newer Older
Roland McGrath's avatar
Roland McGrath committed
1
/* Buffer manipulation primitives for GNU Emacs.
2
   Copyright (C) 1985, 1986, 1987, 1988, 1989, 1993, 1994
3
	Free Software Foundation, Inc.
Roland McGrath's avatar
Roland McGrath 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
9
the Free Software Foundation; either version 2, or (at your option)
Roland McGrath's avatar
Roland McGrath committed
10 11 12 13 14 15 16 17 18 19 20 21
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.  */


22 23
#include <sys/types.h>
#include <sys/stat.h>
Roland McGrath's avatar
Roland McGrath committed
24 25 26 27 28 29 30
#include <sys/param.h>

#ifndef MAXPATHLEN
/* in 4.1, param.h fails to define this. */
#define MAXPATHLEN 1024
#endif /* not MAXPATHLEN */

31
#include <config.h>
Roland McGrath's avatar
Roland McGrath committed
32
#include "lisp.h"
33
#include "intervals.h"
Roland McGrath's avatar
Roland McGrath committed
34 35 36 37
#include "window.h"
#include "commands.h"
#include "buffer.h"
#include "indent.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
38
#include "blockinput.h"
Roland McGrath's avatar
Roland McGrath committed
39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

struct buffer *current_buffer;		/* the current buffer */

/* First buffer in chain of all buffers (in reverse order of creation).
   Threaded through ->next.  */

struct buffer *all_buffers;

/* This structure holds the default values of the buffer-local variables
   defined with DEFVAR_PER_BUFFER, that have special slots in each buffer.
   The default value occupies the same slot in this structure
   as an individual buffer's value occupies in that buffer.
   Setting the default value also goes through the alist of buffers
   and stores into each buffer that does not say it has a local value.  */

struct buffer buffer_defaults;

/* A Lisp_Object pointer to the above, used for staticpro */

static Lisp_Object Vbuffer_defaults;

/* This structure marks which slots in a buffer have corresponding
   default values in buffer_defaults.
   Each such slot has a nonzero value in this structure.
   The value has only one nonzero bit.

   When a buffer has its own local value for a slot,
   the bit for that slot (found in the same slot in this structure)
   is turned on in the buffer's local_var_flags slot.

   If a slot in this structure is -1, then even though there may
   be a DEFVAR_PER_BUFFER for the slot, there is no default value for it;
   and the corresponding slot in buffer_defaults is not used.

   If a slot is -2, then there is no DEFVAR_PER_BUFFER for it,
   but there is a default value which is copied into each buffer.

   If a slot in this structure is negative, then even though there may
   be a DEFVAR_PER_BUFFER for the slot, there is no default value for it;
   and the corresponding slot in buffer_defaults is not used.

   If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is
   zero, that is a bug */

struct buffer buffer_local_flags;

/* This structure holds the names of symbols whose values may be
   buffer-local.  It is indexed and accessed in the same way as the above. */

struct buffer buffer_local_symbols;
/* A Lisp_Object pointer to the above, used for staticpro */
static Lisp_Object Vbuffer_local_symbols;

92 93 94 95 96 97 98 99
/* This structure holds the required types for the values in the
   buffer-local slots.  If a slot contains Qnil, then the
   corresponding buffer slot may contain a value of any type.  If a
   slot contains an integer, then prospective values' tags must be
   equal to that integer.  When a tag does not match, the function
   buffer_slot_type_mismatch will signal an error.  */
struct buffer buffer_local_types;

Roland McGrath's avatar
Roland McGrath committed
100
Lisp_Object Fset_buffer ();
Roland McGrath's avatar
Roland McGrath committed
101
void set_buffer_internal ();
102
static void call_overlay_mod_hooks ();
Roland McGrath's avatar
Roland McGrath committed
103 104 105 106 107 108 109 110 111 112

/* Alist of all buffer names vs the buffers. */
/* This used to be a variable, but is no longer,
 to prevent lossage due to user rplac'ing this alist or its elements.  */
Lisp_Object Vbuffer_alist;

/* Functions to call before and after each text change. */
Lisp_Object Vbefore_change_function;
Lisp_Object Vafter_change_function;

113 114
Lisp_Object Vtransient_mark_mode;

115 116 117 118 119
/* t means ignore all read-only text properties.
   A list means ignore such a property if its value is a member of the list.
   Any non-nil value means ignore buffer-read-only.  */
Lisp_Object Vinhibit_read_only;

120 121 122 123
/* List of functions to call that can query about killing a buffer.
   If any of these functions returns nil, we don't kill it.  */
Lisp_Object Vkill_buffer_query_functions;

Jim Blandy's avatar
Jim Blandy committed
124 125 126
/* List of functions to call before changing an unmodified buffer.  */
Lisp_Object Vfirst_change_hook;
Lisp_Object Qfirst_change_hook;
Roland McGrath's avatar
Roland McGrath committed
127 128 129 130 131 132 133 134 135

Lisp_Object Qfundamental_mode, Qmode_class, Qpermanent_local;

Lisp_Object Qprotected_field;

Lisp_Object QSFundamental;	/* A string "Fundamental" */

Lisp_Object Qkill_buffer_hook;

Richard M. Stallman's avatar
Richard M. Stallman committed
136 137
Lisp_Object Qget_file_buffer;

Jim Blandy's avatar
Jim Blandy committed
138 139
Lisp_Object Qoverlayp;

140 141
Lisp_Object Qpriority, Qwindow;

142 143 144 145
Lisp_Object Qmodification_hooks;
Lisp_Object Qinsert_in_front_hooks;
Lisp_Object Qinsert_behind_hooks;

Roland McGrath's avatar
Roland McGrath committed
146 147 148
/* For debugging; temporary.  See set_buffer_internal.  */
/* Lisp_Object Qlisp_mode, Vcheck_symbol; */

149 150 151 152
#ifdef MSDOS
Lisp_Object Qbuffer_file_type;
#endif

Roland McGrath's avatar
Roland McGrath committed
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183
nsberror (spec)
     Lisp_Object spec;
{
  if (XTYPE (spec) == Lisp_String)
    error ("No buffer named %s", XSTRING (spec)->data);
  error ("Invalid buffer argument");
}

DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 0, 0,
  "Return a list of all existing live buffers.")
  ()
{
  return Fmapcar (Qcdr, Vbuffer_alist);
}

DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0,
  "Return the buffer named NAME (a string).\n\
If there is no live buffer named NAME, return nil.\n\
NAME may also be a buffer; if so, the value is that buffer.")
  (name)
     register Lisp_Object name;
{
  if (XTYPE (name) == Lisp_Buffer)
    return name;
  CHECK_STRING (name, 0);

  return Fcdr (Fassoc (name, Vbuffer_alist));
}

DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0,
  "Return the buffer visiting file FILENAME (a string).\n\
Karl Heuer's avatar
Karl Heuer committed
184
The buffer's `buffer-file-name' must match exactly the expansion of FILENAME.\n\
Roland McGrath's avatar
Roland McGrath committed
185 186 187 188 189
If there is no such live buffer, return nil.")
  (filename)
     register Lisp_Object filename;
{
  register Lisp_Object tail, buf, tem;
Richard M. Stallman's avatar
Richard M. Stallman committed
190 191
  Lisp_Object handler;

Roland McGrath's avatar
Roland McGrath committed
192 193 194
  CHECK_STRING (filename, 0);
  filename = Fexpand_file_name (filename, Qnil);

Richard M. Stallman's avatar
Richard M. Stallman committed
195 196 197 198 199 200
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
  handler = Ffind_file_name_handler (filename);
  if (!NILP (handler))
    return call2 (handler, Qget_file_buffer, filename);

Roland McGrath's avatar
Roland McGrath committed
201 202 203 204 205 206
  for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
    {
      buf = Fcdr (XCONS (tail)->car);
      if (XTYPE (buf) != Lisp_Buffer) continue;
      if (XTYPE (XBUFFER (buf)->filename) != Lisp_String) continue;
      tem = Fstring_equal (XBUFFER (buf)->filename, filename);
Jim Blandy's avatar
Jim Blandy committed
207
      if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
208 209 210 211 212 213 214 215 216 217 218
	return buf;
    }
  return Qnil;
}

/* Incremented for each buffer created, to assign the buffer number. */
int buffer_count;

DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0,
  "Return the buffer named NAME, or create such a buffer and return it.\n\
A new buffer is created if there is no live buffer named NAME.\n\
219
If NAME starts with a space, the new buffer does not keep undo information.\n\
Roland McGrath's avatar
Roland McGrath committed
220 221 222 223 224 225 226 227 228 229
If NAME is a buffer instead of a string, then it is the value returned.\n\
The value is never nil.")  
  (name)
     register Lisp_Object name;
{
  register Lisp_Object buf, function, tem;
  int count = specpdl_ptr - specpdl;
  register struct buffer *b;

  buf = Fget_buffer (name);
Jim Blandy's avatar
Jim Blandy committed
230
  if (!NILP (buf))
Roland McGrath's avatar
Roland McGrath committed
231 232
    return buf;

233
  b = (struct buffer *) xmalloc (sizeof (struct buffer));
Roland McGrath's avatar
Roland McGrath committed
234 235

  BUF_GAP_SIZE (b) = 20;
236
  BLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
237
  BUFFER_ALLOC (BUF_BEG_ADDR (b), BUF_GAP_SIZE (b));
238
  UNBLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
  if (! BUF_BEG_ADDR (b))
    memory_full ();

  BUF_PT (b) = 1;
  BUF_GPT (b) = 1;
  BUF_BEGV (b) = 1;
  BUF_ZV (b) = 1;
  BUF_Z (b) = 1;
  BUF_MODIFF (b) = 1;

  /* Put this on the chain of all buffers including killed ones.  */
  b->next = all_buffers;
  all_buffers = b;

  b->mark = Fmake_marker ();
  /*b->number = make_number (++buffer_count);*/
  b->name = name;
  if (XSTRING (name)->data[0] != ' ')
    b->undo_list = Qnil;
  else
    b->undo_list = Qt;

  reset_buffer (b);

  /* Put this in the alist of all live buffers.  */
  XSET (buf, Lisp_Buffer, b);
  Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil));

  b->mark = Fmake_marker ();
  b->markers = Qnil;
  b->name = name;

  function = buffer_defaults.major_mode;
Jim Blandy's avatar
Jim Blandy committed
272
  if (NILP (function))
Roland McGrath's avatar
Roland McGrath committed
273 274 275 276 277 278
    {
      tem = Fget (current_buffer->major_mode, Qmode_class);
      if (EQ (tem, Qnil))
	function = current_buffer->major_mode;
    }

Jim Blandy's avatar
Jim Blandy committed
279
  if (NILP (function) || EQ (function, Qfundamental_mode))
Roland McGrath's avatar
Roland McGrath committed
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302
    return buf;

  /* To select a nonfundamental mode,
     select the buffer temporarily and then call the mode function. */

  record_unwind_protect (save_excursion_restore, save_excursion_save ());

  Fset_buffer (buf);
  call0 (function);

  return unbind_to (count, buf);
}

/* Reinitialize everything about a buffer except its name and contents.  */

void
reset_buffer (b)
     register struct buffer *b;
{
  b->filename = Qnil;
  b->directory = (current_buffer) ? current_buffer->directory : Qnil;
  b->modtime = 0;
  b->save_modified = 1;
303
  XFASTINT (b->save_length) = 0;
Roland McGrath's avatar
Roland McGrath committed
304 305 306 307 308
  b->last_window_start = 1;
  b->backed_up = Qnil;
  b->auto_save_modified = 0;
  b->auto_save_file_name = Qnil;
  b->read_only = Qnil;
309 310 311
  b->overlays_before = Qnil;
  b->overlays_after = Qnil;
  XFASTINT (b->overlay_center) = 1;
312
  b->mark_active = Qnil;
313 314 315 316

  /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
  INITIALIZE_INTERVAL (b, NULL_INTERVAL);

Roland McGrath's avatar
Roland McGrath committed
317 318 319
  reset_buffer_local_variables(b);
}

320
reset_buffer_local_variables (b)
Roland McGrath's avatar
Roland McGrath committed
321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
     register struct buffer *b;
{
  register int offset;

  /* Reset the major mode to Fundamental, together with all the
     things that depend on the major mode.
     default-major-mode is handled at a higher level.
     We ignore it here.  */
  b->major_mode = Qfundamental_mode;
  b->keymap = Qnil;
  b->abbrev_table = Vfundamental_mode_abbrev_table;
  b->mode_name = QSFundamental;
  b->minor_modes = Qnil;
  b->downcase_table = Vascii_downcase_table;
  b->upcase_table = Vascii_upcase_table;
  b->case_canon_table = Vascii_downcase_table;
  b->case_eqv_table = Vascii_upcase_table;
#if 0
  b->sort_table = XSTRING (Vascii_sort_table);
  b->folding_sort_table = XSTRING (Vascii_folding_sort_table);
#endif /* 0 */

  /* Reset all per-buffer variables to their defaults.  */
  b->local_var_alist = Qnil;
  b->local_var_flags = 0;

  /* For each slot that has a default value,
     copy that into the slot.  */

  for (offset = (char *)&buffer_local_flags.name - (char *)&buffer_local_flags;
       offset < sizeof (struct buffer);
       offset += sizeof (Lisp_Object)) /* sizeof int == sizeof Lisp_Object */
    if (*(int *)(offset + (char *) &buffer_local_flags) > 0
	|| *(int *)(offset + (char *) &buffer_local_flags) == -2)
      *(Lisp_Object *)(offset + (char *)b) =
	*(Lisp_Object *)(offset + (char *)&buffer_defaults);
}

Roland McGrath's avatar
Roland McGrath committed
359 360 361 362 363
/* We split this away from generate-new-buffer, because rename-buffer
   and set-visited-file-name ought to be able to use this to really
   rename the buffer properly.  */

DEFUN ("generate-new-buffer-name", Fgenerate_new_buffer_name, Sgenerate_new_buffer_name,
364
  1, 2, 0,
Roland McGrath's avatar
Roland McGrath committed
365 366
  "Return a string that is the name of no existing buffer based on NAME.\n\
If there is no live buffer named NAME, then return NAME.\n\
Roland McGrath's avatar
Roland McGrath committed
367
Otherwise modify name by appending `<NUMBER>', incrementing NUMBER\n\
368
until an unused name is found, and then return that name.\n\
369
Optional second argument IGNORE specifies a name that is okay to use\n\
370
\(if it is in the sequence to be tried)\n\
371
even if a buffer with that name exists.")
372 373
 (name, ignore)
     register Lisp_Object name, ignore;
Roland McGrath's avatar
Roland McGrath committed
374 375 376 377 378 379 380 381
{
  register Lisp_Object gentemp, tem;
  int count;
  char number[10];

  CHECK_STRING (name, 0);

  tem = Fget_buffer (name);
Jim Blandy's avatar
Jim Blandy committed
382
  if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
383
    return name;
Roland McGrath's avatar
Roland McGrath committed
384 385 386 387 388 389

  count = 1;
  while (1)
    {
      sprintf (number, "<%d>", ++count);
      gentemp = concat2 (name, build_string (number));
390
      tem = Fstring_equal (gentemp, ignore);
391 392
      if (!NILP (tem))
	return gentemp;
Roland McGrath's avatar
Roland McGrath committed
393
      tem = Fget_buffer (gentemp);
Jim Blandy's avatar
Jim Blandy committed
394
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
395
	return gentemp;
Roland McGrath's avatar
Roland McGrath committed
396 397 398 399 400 401
    }
}


DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0,
  "Return the name of BUFFER, as a string.\n\
Roland McGrath's avatar
Roland McGrath committed
402
With no argument or nil as argument, return the name of the current buffer.")
Roland McGrath's avatar
Roland McGrath committed
403 404 405
  (buffer)
     register Lisp_Object buffer;
{
Jim Blandy's avatar
Jim Blandy committed
406
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
407 408 409 410 411 412 413 414 415 416 417
    return current_buffer->name;
  CHECK_BUFFER (buffer, 0);
  return XBUFFER (buffer)->name;
}

DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0,
  "Return name of file BUFFER is visiting, or nil if none.\n\
No argument or nil as argument means use the current buffer.")
  (buffer)
     register Lisp_Object buffer;
{
Jim Blandy's avatar
Jim Blandy committed
418
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
419 420 421 422 423 424 425 426
    return current_buffer->filename;
  CHECK_BUFFER (buffer, 0);
  return XBUFFER (buffer)->filename;
}

DEFUN ("buffer-local-variables", Fbuffer_local_variables,
  Sbuffer_local_variables, 0, 1, 0,
  "Return an alist of variables that are buffer-local in BUFFER.\n\
427 428
Most elements look like (SYMBOL . VALUE), describing one variable.\n\
For a symbol that is locally unbound, just the symbol appears in the value.\n\
Roland McGrath's avatar
Roland McGrath committed
429 430 431 432 433 434
Note that storing new VALUEs in these elements doesn't change the variables.\n\
No argument or nil as argument means use current buffer as BUFFER.")
  (buffer)
     register Lisp_Object buffer;
{
  register struct buffer *buf;
435
  register Lisp_Object result;
Roland McGrath's avatar
Roland McGrath committed
436

Jim Blandy's avatar
Jim Blandy committed
437
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
438 439 440 441 442 443 444
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

445 446
  result = Qnil;

Roland McGrath's avatar
Roland McGrath committed
447 448 449 450 451 452
  {
    /* Reference each variable in the alist in our current buffer.
       If inquiring about the current buffer, this gets the current values,
       so store them into the alist so the alist is up to date.
       If inquiring about some other buffer, this swaps out any values
       for that buffer, making the alist up to date automatically.  */
453 454
    register Lisp_Object tail;
    for (tail = buf->local_var_alist; CONSP (tail); tail = XCONS (tail)->cdr)
Roland McGrath's avatar
Roland McGrath committed
455
      {
456 457 458 459
	Lisp_Object val, elt;

	elt = XCONS (tail)->car;

Roland McGrath's avatar
Roland McGrath committed
460
	if (buf == current_buffer)
461 462 463 464 465 466 467 468 469 470
	  val = find_symbol_value (XCONS (elt)->car);
	else
	  val = XCONS (elt)->cdr;

	/* If symbol is unbound, put just the symbol in the list.  */
	if (EQ (val, Qunbound))
	  result = Fcons (XCONS (elt)->car, result);
	/* Otherwise, put (symbol . value) in the list.  */
	else
	  result = Fcons (Fcons (XCONS (elt)->car, val), result);
Roland McGrath's avatar
Roland McGrath committed
471 472 473 474 475 476 477 478 479 480 481 482 483 484 485
      }
  }

  /* Add on all the variables stored in special slots.  */
  {
    register int offset, mask;

    for (offset = (char *)&buffer_local_symbols.name - (char *)&buffer_local_symbols;
	 offset < sizeof (struct buffer);
	 offset += (sizeof (int))) /* sizeof int == sizeof Lisp_Object */
      {
	mask = *(int *)(offset + (char *) &buffer_local_flags);
	if (mask == -1 || (buf->local_var_flags & mask))
	  if (XTYPE (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols))
	      == Lisp_Symbol)
486 487 488
	    result = Fcons (Fcons (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols),
				   *(Lisp_Object *)(offset + (char *)buf)),
			    result);
Roland McGrath's avatar
Roland McGrath committed
489 490
      }
  }
491 492

  return result;
Roland McGrath's avatar
Roland McGrath committed
493 494 495 496 497 498 499 500 501 502 503
}


DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p,
  0, 1, 0,
  "Return t if BUFFER was modified since its file was last read or saved.\n\
No argument or nil as argument means use current buffer as BUFFER.")
  (buffer)
     register Lisp_Object buffer;
{
  register struct buffer *buf;
Jim Blandy's avatar
Jim Blandy committed
504
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
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
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

  return buf->save_modified < BUF_MODIFF (buf) ? Qt : Qnil;
}

DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p,
  1, 1, 0,
  "Mark current buffer as modified or unmodified according to FLAG.\n\
A non-nil FLAG means mark the buffer modified.")
  (flag)
     register Lisp_Object flag;
{
  register int already;
  register Lisp_Object fn;

#ifdef CLASH_DETECTION
  /* If buffer becoming modified, lock the file.
     If buffer becoming unmodified, unlock the file.  */

  fn = current_buffer->filename;
Jim Blandy's avatar
Jim Blandy committed
530
  if (!NILP (fn))
Roland McGrath's avatar
Roland McGrath committed
531 532
    {
      already = current_buffer->save_modified < MODIFF;
Jim Blandy's avatar
Jim Blandy committed
533
      if (!already && !NILP (flag))
Roland McGrath's avatar
Roland McGrath committed
534
	lock_file (fn);
Jim Blandy's avatar
Jim Blandy committed
535
      else if (already && NILP (flag))
Roland McGrath's avatar
Roland McGrath committed
536 537 538 539
	unlock_file (fn);
    }
#endif /* CLASH_DETECTION */

Jim Blandy's avatar
Jim Blandy committed
540
  current_buffer->save_modified = NILP (flag) ? MODIFF : 0;
Roland McGrath's avatar
Roland McGrath committed
541 542 543 544 545 546 547 548 549 550 551 552 553 554
  update_mode_lines++;
  return flag;
}

DEFUN ("buffer-modified-tick", Fbuffer_modified_tick, Sbuffer_modified_tick,
  0, 1, 0,
  "Return BUFFER's tick counter, incremented for each change in text.\n\
Each buffer has a tick counter which is incremented each time the text in\n\
that buffer is changed.  It wraps around occasionally.\n\
No argument or nil as argument means use current buffer as BUFFER.")
  (buffer)
     register Lisp_Object buffer;
{
  register struct buffer *buf;
Jim Blandy's avatar
Jim Blandy committed
555
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
556 557 558 559 560 561 562 563 564 565
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

  return make_number (BUF_MODIFF (buf));
}

Roland McGrath's avatar
Roland McGrath committed
566
DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 2,
567
       "sRename buffer (to new name): \nP",
Roland McGrath's avatar
Roland McGrath committed
568
  "Change current buffer's name to NEWNAME (a string).\n\
569
If second arg UNIQUE is nil or omitted, it is an error if a\n\
Roland McGrath's avatar
Roland McGrath committed
570
buffer named NEWNAME already exists.\n\
571
If UNIQUE is non-nil, come up with a new name using\n\
Roland McGrath's avatar
Roland McGrath committed
572
`generate-new-buffer-name'.\n\
573 574
Interactively, you can set UNIQUE with a prefix argument.\n\
We return the name we actually gave the buffer.\n\
Roland McGrath's avatar
Roland McGrath committed
575
This does not change the name of the visited file (if any).")
576 577
  (name, unique)
     register Lisp_Object name, unique;
Roland McGrath's avatar
Roland McGrath committed
578 579 580 581 582
{
  register Lisp_Object tem, buf;

  CHECK_STRING (name, 0);
  tem = Fget_buffer (name);
583 584 585 586 587
  /* Don't short-circuit if UNIQUE is t.  That is a useful way to rename
     the buffer automatically so you can create another with the original name.
     It makes UNIQUE equivalent to
     (rename-buffer (generate-new-buffer-name NAME)).  */
  if (NILP (unique) && XBUFFER (tem) == current_buffer)
Roland McGrath's avatar
Roland McGrath committed
588
    return current_buffer->name;
Jim Blandy's avatar
Jim Blandy committed
589
  if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
590
    {
591
      if (!NILP (unique))
592
	name = Fgenerate_new_buffer_name (name, current_buffer->name);
Roland McGrath's avatar
Roland McGrath committed
593 594 595
      else
	error ("Buffer name \"%s\" is in use", XSTRING (name)->data);
    }
Roland McGrath's avatar
Roland McGrath committed
596 597

  current_buffer->name = name;
598 599 600 601 602

  /* Catch redisplay's attention.  Unless we do this, the mode lines for
     any windows displaying current_buffer will stay unchanged.  */
  update_mode_lines++;

Roland McGrath's avatar
Roland McGrath committed
603 604
  XSET (buf, Lisp_Buffer, current_buffer);
  Fsetcar (Frassq (buf, Vbuffer_alist), name);
Jim Blandy's avatar
Jim Blandy committed
605
  if (NILP (current_buffer->filename) && !NILP (current_buffer->auto_save_file_name))
Roland McGrath's avatar
Roland McGrath committed
606
    call0 (intern ("rename-auto-save-file"));
Roland McGrath's avatar
Roland McGrath committed
607
  return name;
Roland McGrath's avatar
Roland McGrath committed
608 609
}

610
DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 2, 0,
Roland McGrath's avatar
Roland McGrath committed
611
  "Return most recently selected buffer other than BUFFER.\n\
612 613
Buffers not visible in windows are preferred to visible buffers,\n\
unless optional second argument VISIBLE-OK is non-nil.\n\
Roland McGrath's avatar
Roland McGrath committed
614 615
If no other buffer exists, the buffer `*scratch*' is returned.\n\
If BUFFER is omitted or nil, some interesting buffer is returned.")
616 617
  (buffer, visible_ok)
     register Lisp_Object buffer, visible_ok;
Roland McGrath's avatar
Roland McGrath committed
618 619 620 621
{
  register Lisp_Object tail, buf, notsogood, tem;
  notsogood = Qnil;

Jim Blandy's avatar
Jim Blandy committed
622
  for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail))
Roland McGrath's avatar
Roland McGrath committed
623 624 625 626 627 628
    {
      buf = Fcdr (Fcar (tail));
      if (EQ (buf, buffer))
	continue;
      if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ')
	continue;
629
      if (NILP (visible_ok))
630
	tem = Fget_buffer_window (buf, Qt);
631 632
      else
	tem = Qnil;
Jim Blandy's avatar
Jim Blandy committed
633
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
634
	return buf;
Jim Blandy's avatar
Jim Blandy committed
635
      if (NILP (notsogood))
Roland McGrath's avatar
Roland McGrath committed
636 637
	notsogood = buf;
    }
Jim Blandy's avatar
Jim Blandy committed
638
  if (!NILP (notsogood))
Roland McGrath's avatar
Roland McGrath committed
639 640 641 642
    return notsogood;
  return Fget_buffer_create (build_string ("*scratch*"));
}

643
DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, Sbuffer_disable_undo, 0, 1,
Roland McGrath's avatar
Roland McGrath committed
644
0,
645 646
  "Make BUFFER stop keeping undo information.\n\
No argument or nil as argument means do this for the current buffer.")
Jim Blandy's avatar
Jim Blandy committed
647 648
  (buffer)
     register Lisp_Object buffer;
Roland McGrath's avatar
Roland McGrath committed
649
{
Jim Blandy's avatar
Jim Blandy committed
650 651 652 653 654 655 656 657 658 659 660 661 662
  Lisp_Object real_buffer;

  if (NILP (buffer))
    XSET (real_buffer, Lisp_Buffer, current_buffer);
  else
    {
      real_buffer = Fget_buffer (buffer);
      if (NILP (real_buffer))
	nsberror (buffer);
    }

  XBUFFER (real_buffer)->undo_list = Qt;

Roland McGrath's avatar
Roland McGrath committed
663 664 665 666 667 668 669
  return Qnil;
}

DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo,
       0, 1, "",
  "Start keeping undo information for buffer BUFFER.\n\
No argument or nil as argument means do this for the current buffer.")
Jim Blandy's avatar
Jim Blandy committed
670 671
  (buffer)
     register Lisp_Object buffer;
Roland McGrath's avatar
Roland McGrath committed
672
{
Jim Blandy's avatar
Jim Blandy committed
673
  Lisp_Object real_buffer;
Roland McGrath's avatar
Roland McGrath committed
674

Jim Blandy's avatar
Jim Blandy committed
675 676
  if (NILP (buffer))
    XSET (real_buffer, Lisp_Buffer, current_buffer);
Roland McGrath's avatar
Roland McGrath committed
677 678
  else
    {
Jim Blandy's avatar
Jim Blandy committed
679 680 681
      real_buffer = Fget_buffer (buffer);
      if (NILP (real_buffer))
	nsberror (buffer);
Roland McGrath's avatar
Roland McGrath committed
682 683
    }

Jim Blandy's avatar
Jim Blandy committed
684 685
  if (EQ (XBUFFER (real_buffer)->undo_list, Qt))
    XBUFFER (real_buffer)->undo_list = Qnil;
Roland McGrath's avatar
Roland McGrath committed
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715

  return Qnil;
}

/*
  DEFVAR_LISP ("kill-buffer-hook", no_cell, "\
Hook to be run (by `run-hooks', which see) when a buffer is killed.\n\
The buffer being killed will be current while the hook is running.\n\
See `kill-buffer'."
 */
DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 1, 1, "bKill buffer: ",
  "Kill the buffer BUFFER.\n\
The argument may be a buffer or may be the name of a buffer.\n\
An argument of nil means kill the current buffer.\n\n\
Value is t if the buffer is actually killed, nil if user says no.\n\n\
The value of `kill-buffer-hook' (which may be local to that buffer),\n\
if not void, is a list of functions to be called, with no arguments,\n\
before the buffer is actually killed.  The buffer to be killed is current\n\
when the hook functions are called.\n\n\
Any processes that have this buffer as the `process-buffer' are killed\n\
with `delete-process'.")
  (bufname)
     Lisp_Object bufname;
{
  Lisp_Object buf;
  register struct buffer *b;
  register Lisp_Object tem;
  register struct Lisp_Marker *m;
  struct gcpro gcpro1, gcpro2;

Jim Blandy's avatar
Jim Blandy committed
716
  if (NILP (bufname))
Roland McGrath's avatar
Roland McGrath committed
717 718 719
    buf = Fcurrent_buffer ();
  else
    buf = Fget_buffer (bufname);
Jim Blandy's avatar
Jim Blandy committed
720
  if (NILP (buf))
Roland McGrath's avatar
Roland McGrath committed
721 722 723 724 725
    nsberror (bufname);

  b = XBUFFER (buf);

  /* Query if the buffer is still modified.  */
Jim Blandy's avatar
Jim Blandy committed
726
  if (INTERACTIVE && !NILP (b->filename)
Roland McGrath's avatar
Roland McGrath committed
727 728 729 730 731 732
      && BUF_MODIFF (b) > b->save_modified)
    {
      GCPRO2 (buf, bufname);
      tem = do_yes_or_no_p (format1 ("Buffer %s modified; kill anyway? ",
				     XSTRING (b->name)->data));
      UNGCPRO;
Jim Blandy's avatar
Jim Blandy committed
733
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
734 735 736
	return Qnil;
    }

737
  /* Run hooks with the buffer to be killed the current buffer.  */
Roland McGrath's avatar
Roland McGrath committed
738 739 740
  {
    register Lisp_Object val;
    int count = specpdl_ptr - specpdl;
741
    Lisp_Object list;
Roland McGrath's avatar
Roland McGrath committed
742 743 744

    record_unwind_protect (save_excursion_restore, save_excursion_save ());
    set_buffer_internal (b);
745 746 747 748 749 750 751 752 753 754 755

    /* First run the query functions; if any query is answered no,
       don't kill the buffer.  */
    for (list = Vkill_buffer_query_functions; !NILP (list); list = Fcdr (list))
      {
	tem = call0 (Fcar (list));
	if (NILP (tem))
	  return unbind_to (count, Qnil);
      }

    /* Then run the hooks.  */
756 757
    if (!NILP (Vrun_hooks))
      call1 (Vrun_hooks, Qkill_buffer_hook);
Roland McGrath's avatar
Roland McGrath committed
758 759 760 761 762 763 764 765 766 767 768
    unbind_to (count, Qnil);
  }

  /* We have no more questions to ask.  Verify that it is valid
     to kill the buffer.  This must be done after the questions
     since anything can happen within do_yes_or_no_p.  */

  /* Don't kill the minibuffer now current.  */
  if (EQ (buf, XWINDOW (minibuf_window)->buffer))
    return Qnil;

Jim Blandy's avatar
Jim Blandy committed
769
  if (NILP (b->name))
Roland McGrath's avatar
Roland McGrath committed
770 771 772 773 774 775 776
    return Qnil;

  /* Make this buffer not be current.
     In the process, notice if this is the sole visible buffer
     and give up if so.  */
  if (b == current_buffer)
    {
777
      tem = Fother_buffer (buf, Qnil);
Roland McGrath's avatar
Roland McGrath committed
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
      Fset_buffer (tem);
      if (b == current_buffer)
	return Qnil;
    }

  /* Now there is no question: we can kill the buffer.  */

#ifdef CLASH_DETECTION
  /* Unlock this buffer's file, if it is locked.  */
  unlock_buffer (b);
#endif /* CLASH_DETECTION */

  kill_buffer_processes (buf);

  tem = Vinhibit_quit;
  Vinhibit_quit = Qt;
  Vbuffer_alist = Fdelq (Frassq (buf, Vbuffer_alist), Vbuffer_alist);
  Freplace_buffer_in_windows (buf);
  Vinhibit_quit = tem;

  /* Delete any auto-save file.  */
  if (XTYPE (b->auto_save_file_name) == Lisp_String)
    {
      Lisp_Object tem;
      tem = Fsymbol_value (intern ("delete-auto-save-files"));
Jim Blandy's avatar
Jim Blandy committed
803
      if (! NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
804 805 806 807 808 809 810 811 812 813 814 815 816 817
	unlink (XSTRING (b->auto_save_file_name)->data);
    }

  /* Unchain all markers of this buffer
     and leave them pointing nowhere.  */
  for (tem = b->markers; !EQ (tem, Qnil); )
    {
      m = XMARKER (tem);
      m->buffer = 0;
      tem = m->chain;
      m->chain = Qnil;
    }
  b->markers = Qnil;

818 819 820 821
  /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */
  INITIALIZE_INTERVAL (b, NULL_INTERVAL);
  /* Perhaps we should explicitly free the interval tree here... */

Roland McGrath's avatar
Roland McGrath committed
822
  b->name = Qnil;
823
  BLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
824
  BUFFER_FREE (BUF_BEG_ADDR (b));
825
  UNBLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
826 827 828 829 830
  b->undo_list = Qnil;

  return Qt;
}

Jim Blandy's avatar
Jim Blandy committed
831 832 833 834
/* Move the assoc for buffer BUF to the front of buffer-alist.  Since
   we do this each time BUF is selected visibly, the more recently
   selected buffers are always closer to the front of the list.  This
   means that other_buffer is more likely to choose a relevant buffer.  */
Roland McGrath's avatar
Roland McGrath committed
835 836 837 838 839 840 841 842 843 844 845 846 847 848

record_buffer (buf)
     Lisp_Object buf;
{
  register Lisp_Object link, prev;

  prev = Qnil;
  for (link = Vbuffer_alist; CONSP (link); link = XCONS (link)->cdr)
    {
      if (EQ (XCONS (XCONS (link)->car)->cdr, buf))
	break;
      prev = link;
    }

Jim Blandy's avatar
Jim Blandy committed
849 850
  /* Effectively do Vbuffer_alist = Fdelq (link, Vbuffer_alist);
     we cannot use Fdelq itself here because it allows quitting.  */
Roland McGrath's avatar
Roland McGrath committed
851

Jim Blandy's avatar
Jim Blandy committed
852
  if (NILP (prev))
Roland McGrath's avatar
Roland McGrath committed
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
    Vbuffer_alist = XCONS (Vbuffer_alist)->cdr;
  else
    XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr;
	
  XCONS(link)->cdr = Vbuffer_alist;
  Vbuffer_alist = link;
}

DEFUN ("switch-to-buffer", Fswitch_to_buffer, Sswitch_to_buffer, 1, 2, "BSwitch to buffer: ",
  "Select buffer BUFFER in the current window.\n\
BUFFER may be a buffer or a buffer name.\n\
Optional second arg NORECORD non-nil means\n\
do not put this buffer at the front of the list of recently selected ones.\n\
\n\
WARNING: This is NOT the way to work on another buffer temporarily\n\
within a Lisp program!  Use `set-buffer' instead.  That avoids messing with\n\
the window-buffer correspondences.")
  (bufname, norecord)
     Lisp_Object bufname, norecord;
{
  register Lisp_Object buf;
  Lisp_Object tem;

  if (EQ (minibuf_window, selected_window))
    error ("Cannot switch buffers in minibuffer window");
  tem = Fwindow_dedicated_p (selected_window);
Jim Blandy's avatar
Jim Blandy committed
879
  if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
880 881
    error ("Cannot switch buffers in a dedicated window");

Jim Blandy's avatar
Jim Blandy committed
882
  if (NILP (bufname))
883
    buf = Fother_buffer (Fcurrent_buffer (), Qnil);
Roland McGrath's avatar
Roland McGrath committed
884 885 886
  else
    buf = Fget_buffer_create (bufname);
  Fset_buffer (buf);
Jim Blandy's avatar
Jim Blandy committed
887
  if (NILP (norecord))
Roland McGrath's avatar
Roland McGrath committed
888 889 890
    record_buffer (buf);

  Fset_window_buffer (EQ (selected_window, minibuf_window)
891 892
		      ? Fnext_window (minibuf_window, Qnil, Qnil)
		      : selected_window,
Roland McGrath's avatar
Roland McGrath committed
893 894
		      buf);

895
  return buf;
Roland McGrath's avatar
Roland McGrath committed
896 897 898 899 900 901 902 903 904 905 906 907
}

DEFUN ("pop-to-buffer", Fpop_to_buffer, Spop_to_buffer, 1, 2, 0,
  "Select buffer BUFFER in some window, preferably a different one.\n\
If BUFFER is nil, then some other buffer is chosen.\n\
If `pop-up-windows' is non-nil, windows can be split to do this.\n\
If optional second arg OTHER-WINDOW is non-nil, insist on finding another\n\
window even if BUFFER is already visible in the selected window.")
  (bufname, other)
     Lisp_Object bufname, other;
{
  register Lisp_Object buf;
Jim Blandy's avatar
Jim Blandy committed
908
  if (NILP (bufname))
909
    buf = Fother_buffer (Fcurrent_buffer (), Qnil);
Roland McGrath's avatar
Roland McGrath committed
910 911 912 913 914
  else
    buf = Fget_buffer_create (bufname);
  Fset_buffer (buf);
  record_buffer (buf);
  Fselect_window (Fdisplay_buffer (buf, other));
915
  return buf;
Roland McGrath's avatar
Roland McGrath committed
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
}

DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0,
  "Return the current buffer as a Lisp object.")
  ()
{
  register Lisp_Object buf;
  XSET (buf, Lisp_Buffer, current_buffer);
  return buf;
}

/* Set the current buffer to b */

void
set_buffer_internal (b)
     register struct buffer *b;
{
  register struct buffer *old_buf;
  register Lisp_Object tail, valcontents;
  enum Lisp_Type tem;

  if (current_buffer == b)
    return;

  windows_or_buffers_changed = 1;
  old_buf = current_buffer;
  current_buffer = b;
  last_known_column_point = -1;   /* invalidate indentation cache */

  /* Look down buffer's list of local Lisp variables
     to find and update any that forward into C variables. */

Jim Blandy's avatar
Jim Blandy committed
948
  for (tail = b->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr)
Roland McGrath's avatar
Roland McGrath committed
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
    {
      valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value;
      if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value
	   || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
	  && (tem = XTYPE (XCONS (valcontents)->car),
	      (tem == Lisp_Boolfwd || tem == Lisp_Intfwd
	       || tem == Lisp_Objfwd)))
	/* Just reference the variable
	     to cause it to become set for this buffer.  */
	Fsymbol_value (XCONS (XCONS (tail)->car)->car);
    }

  /* Do the same with any others that were local to the previous buffer */

  if (old_buf)
Jim Blandy's avatar
Jim Blandy committed
964
    for (tail = old_buf->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr)
Roland McGrath's avatar
Roland McGrath committed
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
      {
	valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value;
	if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value
	     || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
	    && (tem = XTYPE (XCONS (valcontents)->car),
		(tem == Lisp_Boolfwd || tem == Lisp_Intfwd
		 || tem == Lisp_Objfwd)))
	  /* Just reference the variable
               to cause it to become set for this buffer.  */
	  Fsymbol_value (XCONS (XCONS (tail)->car)->car);
      }
}

DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0,
  "Make the buffer BUFFER current for editing operations.\n\
BUFFER may be a buffer or the name of an existing buffer.\n\
See also `save-excursion' when you want to make a buffer current temporarily.\n\
This function does not display the buffer, so its effect ends\n\
when the current command terminates.\n\
Use `switch-to-buffer' or `pop-to-buffer' to switch buffers permanently.")
  (bufname)
     register Lisp_Object bufname;
{
  register Lisp_Object buffer;
  buffer = Fget_buffer (bufname);
Jim Blandy's avatar
Jim Blandy committed
990
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
991
    nsberror (bufname);
Jim Blandy's avatar
Jim Blandy committed
992
  if (NILP (XBUFFER (buffer)->name))
Roland McGrath's avatar
Roland McGrath committed
993 994 995 996 997 998 999 1000 1001 1002
    error ("Selecting deleted buffer");
  set_buffer_internal (XBUFFER (buffer));
  return buffer;
}

DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only,
				   Sbarf_if_buffer_read_only, 0, 0, 0,
  "Signal a `buffer-read-only' error if the current buffer is read-only.")
  ()
{
1003 1004
  if (!NILP (current_buffer->read_only)
      && NILP (Vinhibit_read_only))
Roland McGrath's avatar
Roland McGrath committed
1005 1006 1007 1008 1009 1010 1011
    Fsignal (Qbuffer_read_only, (Fcons (Fcurrent_buffer (), Qnil)));
  return Qnil;
}

DEFUN ("bury-buffer", Fbury_buffer, Sbury_buffer, 0, 1, "",
  "Put BUFFER at the end of the list of all buffers.\n\
There it is the least likely candidate for `other-buffer' to return;\n\
1012
thus, the least likely buffer for \\[switch-to-buffer] to select by default.\n\
1013 1014 1015
If BUFFER is nil or omitted, bury the current buffer.\n\
Also, if BUFFER is nil or omitted, remove the current buffer from the\n\
selected window if it is displayed there.")
Roland McGrath's avatar
Roland McGrath committed
1016 1017 1018
  (buf)
     register Lisp_Object buf;
{
1019
  /* Figure out what buffer we're going to bury.  */
Jim Blandy's avatar
Jim Blandy committed
1020
  if (NILP (buf))
1021 1022 1023 1024
    {
      XSET (buf, Lisp_Buffer, current_buffer);

      /* If we're burying the current buffer, unshow it.  */
1025
      Fswitch_to_buffer (Fother_buffer (buf, Qnil), Qnil);
1026
    }
Roland McGrath's avatar
Roland McGrath committed
1027 1028 1029 1030 1031
  else
    {
      Lisp_Object buf1;
      
      buf1 = Fget_buffer (buf);
Jim Blandy's avatar
Jim Blandy committed
1032
      if (NILP (buf1))
Roland McGrath's avatar
Roland McGrath committed
1033 1034
	nsberror (buf);
      buf = buf1;
1035 1036
    }

1037
  /* Move buf to the end of the buffer list.  */
1038 1039 1040 1041 1042 1043 1044 1045 1046
  {
    register Lisp_Object aelt, link;

    aelt = Frassq (buf, Vbuffer_alist);
    link = Fmemq (aelt, Vbuffer_alist);
    Vbuffer_alist = Fdelq (aelt, Vbuffer_alist);
    XCONS (link)->cdr = Qnil;
    Vbuffer_alist = nconc2 (Vbuffer_alist, link);
  }
Roland McGrath's avatar
Roland McGrath committed
1047 1048 1049 1050

  return Qnil;
}

1051
DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, "*",
Roland McGrath's avatar
Roland McGrath committed
1052
  "Delete the entire contents of the current buffer.\n\
1053
Any narrowing restriction in effect (see `narrow-to-region') is removed,\n\
Roland McGrath's avatar
Roland McGrath committed
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
so the buffer is truly empty after this.")
  ()
{
  Fwiden ();
  del_range (BEG, Z);
  current_buffer->last_window_start = 1;
  /* Prevent warnings, or suspension of auto saving, that would happen
     if future size is less than past size.  Use of erase-buffer
     implies that the future text is not really related to the past text.  */
  XFASTINT (current_buffer->save_length) = 0;
  return Qnil;
}

validate_region (b, e)
     register Lisp_Object *b, *e;
{
  register int i;

  CHECK_NUMBER_COERCE_MARKER (*b, 0);
  CHECK_NUMBER_COERCE_MARKER (*e, 1);

  if (XINT (*b) > XINT (*e))
    {
      i = XFASTINT (*b);	/* This is legit even if *b is < 0 */
      *b = *e;
      XFASTINT (*e) = i;	/* because this is all we do with i.  */
    }

  if (!(BEGV <= XINT (*b) && XINT (*b) <= XINT (*e)
        && XINT (*e) <= ZV))
    args_out_of_range (*b, *e);
}

Lisp_Object
list_buffers_1 (files)
     Lisp_Object files;
{
  register Lisp_Object tail, tem, buf;
  Lisp_Object col1, col2, col3, minspace;
  register struct buffer *old = current_buffer, *b;
1094
  Lisp_Object desired_point;
Roland McGrath's avatar
Roland McGrath committed
1095 1096
  Lisp_Object other_file_symbol;

1097
  desired_point = Qnil;
Roland McGrath's avatar
Roland McGrath committed
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
  other_file_symbol = intern ("list-buffers-directory");

  XFASTINT (col1) = 19;
  XFASTINT (col2) = 25;
  XFASTINT (col3) = 40;
  XFASTINT (minspace) = 1;

  Fset_buffer (Vstandard_output);

  tail = intern ("Buffer-menu-mode");
  if (!EQ (tail, current_buffer->major_mode)
Jim Blandy's avatar
Jim Blandy committed
1109
      && (tem = Ffboundp (tail), !NILP (tem)))
Roland McGrath's avatar
Roland McGrath committed
1110 1111 1112 1113 1114 1115 1116 1117
    call0 (tail);
  Fbuffer_disable_undo (Vstandard_output);
  current_buffer->read_only = Qnil;

  write_string ("\
 MR Buffer         Size  Mode           File\n\
 -- ------         ----  ----           ----\n", -1);

Jim Blandy's avatar
Jim Blandy committed
1118
  for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail))
Roland McGrath's avatar
Roland McGrath committed
1119 1120 1121 1122 1123 1124 1125
    {
      buf = Fcdr (Fcar (tail));
      b = XBUFFER (buf);
      /* Don't mention the minibuffers. */
      if (XSTRING (b->name)->data[0] == ' ')
	continue;
      /* Optionally don't mention buffers that lack files. */
Jim Blandy's avatar
Jim Blandy committed
1126
      if (!NILP (files) && NILP (b->filename))
Roland McGrath's avatar
Roland McGrath committed
1127 1128 1129
	continue;
      /* Identify the current buffer. */
      if (b == old)
1130
	XFASTINT (desired_point) = point;
Roland McGrath's avatar
Roland McGrath committed
1131 1132 1133
      write_string (b == old ? "." : " ", -1);
      /* Identify modified buffers */
      write_string (BUF_MODIFF (b) > b->save_modified ? "*" : " ", -1);
Jim Blandy's avatar
Jim Blandy committed
1134
      write_string (NILP (b->read_only) ? "  " : "% ", -1);
Roland McGrath's avatar
Roland McGrath committed
1135 1136 1137 1138 1139 1140 1141 1142
      Fprinc (b->name, Qnil);
      Findent_to (col1, make_number (2));
      XFASTINT (tem) = BUF_Z (b) - BUF_BEG (b);
      Fprin1 (tem, Qnil);
      Findent_to (col2, minspace);
      Fprinc (b->mode_name, Qnil);
      Findent_to (col3, minspace);

Jim Blandy's avatar
Jim Blandy committed
1143
      if (!NILP (b->filename))
Roland McGrath's avatar
Roland McGrath committed
1144 1145 1146 1147 1148 1149 1150
	Fprinc (b->filename, Qnil);
      else
	{
	  /* No visited file; check local value of list-buffers-directory.  */
	  Lisp_Object tem;
	  set_buffer_internal (b);
	  tem = Fboundp (other_file_symbol);
Jim Blandy's avatar
Jim Blandy committed
1151
	  if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
	    {
	      tem = Fsymbol_value (other_file_symbol);
	      Fset_buffer (Vstandard_output);
	      if (XTYPE (tem) == Lisp_String)
		Fprinc (tem, Qnil);
	    }
	  else
	    Fset_buffer (Vstandard_output);
	}
      write_string ("\n", -1);
    }

  current_buffer->read_only = Qt;
  set_buffer_internal (old);
1166
  return desired_point;
Roland McGrath's avatar
Roland McGrath committed
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
}

DEFUN ("list-buffers", Flist_buffers, Slist_buffers, 0, 1, "P",
  "Display a list of names of existing buffers.\n\
The list is displayed in a buffer named `*Buffer List*'.\n\
Note that buffers with names starting with spaces are omitted.\n\
Non-null optional arg FILES-ONLY means mention only file buffers.\n\
\n\
The M column contains a * for buffers that are modified.\n\
The R column contains a % for buffers that are read-only.")
  (files)
     Lisp_Object files;
{
1180 1181
  Lisp_Object desired_point;

1182 1183 1184
  desired_point
    = internal_with_output_to_temp_buffer ("*Buffer List*",
					   list_buffers_1, files);
1185

1186 1187 1188 1189 1190 1191 1192 1193
  if (NUMBERP (desired_point))
    {
      int count = specpdl_ptr - specpdl;
      record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
      Fset_buffer (build_string ("*Buffer List*"));
      SET_PT (XINT (desired_point));
      return unbind_to (count, Qnil);
    }
1194
  return Qnil;
Roland McGrath's avatar
Roland McGrath committed
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
}

DEFUN ("kill-all-local-variables", Fkill_all_local_variables, Skill_all_local_variables,
  0, 0, 0,
  "Switch to Fundamental mode by killing current buffer's local variables.\n\
Most local variable bindings are eliminated so that the default values\n\
become effective once more.  Also, the syntax table is set from\n\
`standard-syntax-table', the local keymap is set to nil,\n\
and the abbrev table from `fundamental-mode-abbrev-table'.\n\
This function also forces redisplay of the mode line.\n\
\n\
Every function to select a new major mode starts by\n\
calling this function.\n\n\
As a special exception, local variables whose names have\n\
a non-nil `permanent-local' property are not eliminated by this function.")
  ()
{
  register Lisp_Object alist, sym, tem;
  Lisp_Object oalist;
1214

1215 1216
  if (!NILP (Vrun_hooks))
    call1 (Vrun_hooks, intern ("change-major-mode-hook"));
Roland McGrath's avatar
Roland McGrath committed
1217 1218 1219 1220 1221
  oalist = current_buffer->local_var_alist;

  /* Make sure no local variables remain set up with this buffer
     for their current values.  */

Jim Blandy's avatar
Jim Blandy committed
1222
  for (alist = oalist; !NILP (alist); alist = XCONS (alist)->cdr)
Roland McGrath's avatar
Roland McGrath committed
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
    {
      sym = XCONS (XCONS (alist)->car)->car;

      /* Need not do anything if some other buffer's binding is now encached.  */
      tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car;
      if (XBUFFER (tem) == current_buffer)
	{
	  /* Symbol is set up for this buffer's old local value.
	     Set it up for the current buffer with the default value.  */

	  tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->cdr;
1234 1235 1236 1237
	  /* Store the symbol's current value into the alist entry
	     it is currently set up for.  This is so that, if the
	     local is marked permanent, and we make it local again below,
	     we don't lose the value.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
1238 1239
	  XCONS (XCONS (tem)->car)->cdr
	    = do_symval_forwarding (XCONS (XSYMBOL (sym)->value)->car);
1240
	  /* Switch to the symbol's default-value alist entry.  */
Roland McGrath's avatar
Roland McGrath committed
1241
	  XCONS (tem)->car = tem;
1242
	  /* Mark it as current for the current buffer.  */
Roland McGrath's avatar
Roland McGrath committed
1243
	  XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car = Fcurrent_buffer ();
1244
	  /* Store the current value into any forwarding in the symbol.  */
Roland McGrath's avatar
Roland McGrath committed
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
	  store_symval_forwarding (sym, XCONS (XSYMBOL (sym)->value)->car,
				   XCONS (tem)->cdr);
	}
    }

  /* Actually eliminate all local bindings of this buffer.  */

  reset_buffer_local_variables (current_buffer);

  /* Redisplay mode lines; we are changing major mode.  */

  update_mode_lines++;

  /* Any which are supposed to be permanent,
     make local again, with the same values they had.  */
     
Jim Blandy's avatar
Jim Blandy committed
1261
  for (alist = oalist; !NILP (alist); alist = XCONS (alist)->cdr)
Roland McGrath's avatar
Roland McGrath committed
1262 1263 1264
    {
      sym = XCONS (XCONS (alist)->car)->car;
      tem = Fget (sym, Qpermanent_local);
Jim Blandy's avatar
Jim Blandy committed
1265
      if (! NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
1266 1267 1268 1269
	{
	  Fmake_local_variable (sym);
	  Fset (sym, XCONS (XCONS (alist)->car)->cdr);
	}
Roland McGrath's avatar
Roland McGrath committed
1270 1271 1272 1273 1274 1275 1276 1277 1278
    }

  /* Force mode-line redisplay.  Useful here because all major mode
     commands call this function.  */
  update_mode_lines++;

  return Qnil;
}

1279 1280 1281
/* Find all the overlays in the current buffer that contain position POS.
   Return the number found, and store them in a vector in *VEC_PTR.  
   Store in *LEN_PTR the size allocated for the vector.
Jim Blandy's avatar
Jim Blandy committed
1282 1283
   Store in *NEXT_PTR the next position after POS where an overlay starts,
     or ZV if there are no more overlays.
1284 1285

   *VEC_PTR and *LEN_PTR should contain a valid vector and size
1286 1287 1288 1289 1290 1291
   when this function is called.

   If EXTEND is non-zero, we make the vector bigger if necessary.
   If EXTEND is zero, we never extend the vector,
   and we store only as many overlays as will fit.
   But we still return the total number of overlays.  */
1292 1293

int
1294
overlays_at (pos, extend, vec_ptr, len_ptr, next_ptr)
1295
     int pos;
1296
     int extend;
1297 1298 1299
     Lisp_Object **vec_ptr;
     int *len_ptr;
     int *next_ptr;
Roland McGrath's avatar
Roland McGrath committed
1300
{
1301 1302 1303 1304 1305
  Lisp_Object tail, overlay, start, end, result;
  int idx = 0;
  int len = *len_ptr;
  Lisp_Object *vec = *vec_ptr;
  int next = ZV;
1306 1307
  int inhibit_storing = 0;