buffer.c 104 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, 1995
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
#include "window.h"
#include "commands.h"
#include "buffer.h"
37
#include "region-cache.h"
Roland McGrath's avatar
Roland McGrath committed
38
#include "indent.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
39
#include "blockinput.h"
Roland McGrath's avatar
Roland McGrath committed
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 92

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;

93 94 95 96 97 98 99 100
/* 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
101
Lisp_Object Fset_buffer ();
Roland McGrath's avatar
Roland McGrath committed
102
void set_buffer_internal ();
103
static void call_overlay_mod_hooks ();
Roland McGrath's avatar
Roland McGrath committed
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 Vbefore_change_functions;
Lisp_Object Vafter_change_functions;
Roland McGrath's avatar
Roland McGrath committed
115

116 117
Lisp_Object Vtransient_mark_mode;

118 119 120 121 122
/* 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;

123 124 125 126
/* 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
127 128 129
/* 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
130 131 132 133 134 135 136 137 138

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
139 140
Lisp_Object Qget_file_buffer;

Jim Blandy's avatar
Jim Blandy committed
141 142
Lisp_Object Qoverlayp;

Karl Heuer's avatar
Karl Heuer committed
143
Lisp_Object Qpriority, Qwindow, Qevaporate;
144

145 146 147 148
Lisp_Object Qmodification_hooks;
Lisp_Object Qinsert_in_front_hooks;
Lisp_Object Qinsert_behind_hooks;

Roland McGrath's avatar
Roland McGrath committed
149 150 151 152 153 154
/* For debugging; temporary.  See set_buffer_internal.  */
/* Lisp_Object Qlisp_mode, Vcheck_symbol; */

nsberror (spec)
     Lisp_Object spec;
{
155
  if (STRINGP (spec))
Roland McGrath's avatar
Roland McGrath committed
156 157 158 159 160 161 162 163 164 165 166
    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);
}

167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187
/* Like Fassoc, but use Fstring_equal to compare
   (which ignores text properties),
   and don't ever QUIT.  */

static Lisp_Object
assoc_ignore_text_properties (key, list)
     register Lisp_Object key;
     Lisp_Object list;
{
  register Lisp_Object tail;
  for (tail = list; !NILP (tail); tail = Fcdr (tail))
    {
      register Lisp_Object elt, tem;
      elt = Fcar (tail);
      tem = Fstring_equal (Fcar (elt), key);
      if (!NILP (tem))
	return elt;
    }
  return Qnil;
}

Roland McGrath's avatar
Roland McGrath committed
188 189 190 191 192 193 194
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;
{
195
  if (BUFFERP (name))
Roland McGrath's avatar
Roland McGrath committed
196 197 198
    return name;
  CHECK_STRING (name, 0);

199
  return Fcdr (assoc_ignore_text_properties (name, Vbuffer_alist));
Roland McGrath's avatar
Roland McGrath committed
200 201 202 203
}

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
204
The buffer's `buffer-file-name' must match exactly the expansion of FILENAME.\n\
205 206
If there is no such live buffer, return nil.\n\
See also `find-buffer-visiting'.")
Roland McGrath's avatar
Roland McGrath committed
207 208 209 210
  (filename)
     register Lisp_Object filename;
{
  register Lisp_Object tail, buf, tem;
Richard M. Stallman's avatar
Richard M. Stallman committed
211 212
  Lisp_Object handler;

Roland McGrath's avatar
Roland McGrath committed
213 214 215
  CHECK_STRING (filename, 0);
  filename = Fexpand_file_name (filename, Qnil);

Richard M. Stallman's avatar
Richard M. Stallman committed
216 217
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
218
  handler = Ffind_file_name_handler (filename, Qget_file_buffer);
Richard M. Stallman's avatar
Richard M. Stallman committed
219 220 221
  if (!NILP (handler))
    return call2 (handler, Qget_file_buffer, filename);

Roland McGrath's avatar
Roland McGrath committed
222 223 224
  for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
    {
      buf = Fcdr (XCONS (tail)->car);
225 226
      if (!BUFFERP (buf)) continue;
      if (!STRINGP (XBUFFER (buf)->filename)) continue;
Roland McGrath's avatar
Roland McGrath committed
227
      tem = Fstring_equal (XBUFFER (buf)->filename, filename);
Jim Blandy's avatar
Jim Blandy committed
228
      if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
229 230 231 232 233 234 235 236 237 238 239
	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\
240
If NAME starts with a space, the new buffer does not keep undo information.\n\
Roland McGrath's avatar
Roland McGrath committed
241 242 243 244 245
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;
{
246
  register Lisp_Object buf;
Roland McGrath's avatar
Roland McGrath committed
247 248 249
  register struct buffer *b;

  buf = Fget_buffer (name);
Jim Blandy's avatar
Jim Blandy committed
250
  if (!NILP (buf))
Roland McGrath's avatar
Roland McGrath committed
251 252
    return buf;

253 254 255
  if (XSTRING (name)->size == 0)
    error ("Empty string for buffer name is not allowed");

256
  b = (struct buffer *) xmalloc (sizeof (struct buffer));
Roland McGrath's avatar
Roland McGrath committed
257

258 259 260 261 262 263
  b->size = sizeof (struct buffer) / sizeof (EMACS_INT);

  /* An ordinary buffer uses its own struct buffer_text.  */
  b->text = &b->own_text;
  b->base_buffer = 0;

Roland McGrath's avatar
Roland McGrath committed
264
  BUF_GAP_SIZE (b) = 20;
265
  BLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
266
  BUFFER_ALLOC (BUF_BEG_ADDR (b), BUF_GAP_SIZE (b));
267
  UNBLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
268
  if (! BUF_BEG_ADDR (b))
269
    buffer_memory_full ();
Roland McGrath's avatar
Roland McGrath committed
270 271 272 273 274 275 276

  BUF_PT (b) = 1;
  BUF_GPT (b) = 1;
  BUF_BEGV (b) = 1;
  BUF_ZV (b) = 1;
  BUF_Z (b) = 1;
  BUF_MODIFF (b) = 1;
277 278
  BUF_SAVE_MODIFF (b) = 1;
  BUF_INTERVALS (b) = 0;
Roland McGrath's avatar
Roland McGrath committed
279

280 281 282 283
  b->newline_cache = 0;
  b->width_run_cache = 0;
  b->width_table = Qnil;

Roland McGrath's avatar
Roland McGrath committed
284 285 286 287
  /* Put this on the chain of all buffers including killed ones.  */
  b->next = all_buffers;
  all_buffers = b;

288 289 290 291 292
  /* An ordinary buffer normally doesn't need markers
     to handle BEGV and ZV.  */
  b->pt_marker = Qnil;
  b->begv_marker = Qnil;
  b->zv_marker = Qnil;
293 294 295

  name = Fcopy_sequence (name);
  INITIALIZE_INTERVAL (XSTRING (name), NULL_INTERVAL);
Roland McGrath's avatar
Roland McGrath committed
296
  b->name = name;
297

Roland McGrath's avatar
Roland McGrath committed
298 299 300 301 302 303
  if (XSTRING (name)->data[0] != ' ')
    b->undo_list = Qnil;
  else
    b->undo_list = Qt;

  reset_buffer (b);
304
  reset_buffer_local_variables (b);
Roland McGrath's avatar
Roland McGrath committed
305 306

  /* Put this in the alist of all live buffers.  */
307
  XSETBUFFER (buf, b);
Roland McGrath's avatar
Roland McGrath committed
308 309 310
  Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil));

  b->mark = Fmake_marker ();
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
  BUF_MARKERS (b) = Qnil;
  b->name = name;
  return buf;
}

DEFUN ("make-indirect-buffer",
       Fmake_indirect_buffer, Smake_indirect_buffer, 2, 2,
       "BMake indirect buffer: \nbIndirect to base buffer: ",
  "Create and return an indirect buffer named NAME, with base buffer BASE.\n\
BASE should be an existing buffer (or buffer name).")
  (name, base_buffer)
     register Lisp_Object name, base_buffer;
{
  register Lisp_Object buf;
  register struct buffer *b;

  buf = Fget_buffer (name);
  if (!NILP (buf))
    error ("Buffer name `%s' is in use", XSTRING (name)->data);

  base_buffer = Fget_buffer (base_buffer);
  if (NILP (base_buffer))
    error ("No such buffer: `%s'",
	   XSTRING (XBUFFER (base_buffer)->name)->data);

  if (XSTRING (name)->size == 0)
    error ("Empty string for buffer name is not allowed");

  b = (struct buffer *) xmalloc (sizeof (struct buffer));

  b->size = sizeof (struct buffer) / sizeof (EMACS_INT);

  if (XBUFFER (base_buffer)->base_buffer)
    b->base_buffer = XBUFFER (base_buffer)->base_buffer;
  else
    b->base_buffer = XBUFFER (base_buffer);

  /* Use the base buffer's text object.  */
  b->text = b->base_buffer->text;

  BUF_BEGV (b) = BUF_BEGV (b->base_buffer);
  BUF_ZV (b) = BUF_ZV (b->base_buffer);
  BUF_PT (b) = BUF_PT (b->base_buffer);

  b->newline_cache = 0;
  b->width_run_cache = 0;
  b->width_table = Qnil;

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

  name = Fcopy_sequence (name);
  INITIALIZE_INTERVAL (XSTRING (name), NULL_INTERVAL);
  b->name = name;

  reset_buffer (b);
  reset_buffer_local_variables (b);

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

  b->mark = Fmake_marker ();
Roland McGrath's avatar
Roland McGrath committed
375
  b->name = name;
376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401

  /* Make sure the base buffer has markers for its narrowing.  */
  if (NILP (b->base_buffer->pt_marker))
    {
      b->base_buffer->pt_marker = Fmake_marker ();
      Fset_marker (b->base_buffer->pt_marker,
		   make_number (BUF_PT (b->base_buffer)), base_buffer);
    }
  if (NILP (b->base_buffer->begv_marker))
    {
      b->base_buffer->begv_marker = Fmake_marker ();
      Fset_marker (b->base_buffer->begv_marker,
		   make_number (BUF_BEGV (b->base_buffer)), base_buffer);
    }
  if (NILP (b->base_buffer->zv_marker))
    {
      b->base_buffer->zv_marker = Fmake_marker ();
      Fset_marker (b->base_buffer->zv_marker,
		   make_number (BUF_ZV (b->base_buffer)), base_buffer);
    }

  /* Give the indirect buffer markers for its narrowing.  */
  b->pt_marker = Fpoint_marker ();
  b->begv_marker = Fpoint_min_marker ();
  b->zv_marker = Fpoint_max_marker ();

402
  return buf;
Roland McGrath's avatar
Roland McGrath committed
403 404
}

405 406
/* Reinitialize everything about a buffer except its name and contents
   and local variables.  */
Roland McGrath's avatar
Roland McGrath committed
407 408 409 410 411 412

void
reset_buffer (b)
     register struct buffer *b;
{
  b->filename = Qnil;
413
  b->file_truename = Qnil;
Roland McGrath's avatar
Roland McGrath committed
414 415
  b->directory = (current_buffer) ? current_buffer->directory : Qnil;
  b->modtime = 0;
416
  XSETFASTINT (b->save_length, 0);
Roland McGrath's avatar
Roland McGrath committed
417 418 419
  b->last_window_start = 1;
  b->backed_up = Qnil;
  b->auto_save_modified = 0;
420
  b->auto_save_failure_time = -1;
Roland McGrath's avatar
Roland McGrath committed
421 422
  b->auto_save_file_name = Qnil;
  b->read_only = Qnil;
423 424
  b->overlays_before = Qnil;
  b->overlays_after = Qnil;
425
  XSETFASTINT (b->overlay_center, 1);
426
  b->mark_active = Qnil;
427
  b->point_before_scroll = Qnil;
Roland McGrath's avatar
Roland McGrath committed
428 429
}

430 431 432 433 434
/* Reset buffer B's local variables info.
   Don't use this on a buffer that has already been in use;
   it does not treat permanent locals consistently.
   Instead, use Fkill_all_local_variables.  */

435
reset_buffer_local_variables (b)
Roland McGrath's avatar
Roland McGrath committed
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450
     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;
451 452
  b->case_canon_table = Vascii_canon_table;
  b->case_eqv_table = Vascii_eqv_table;
453
  b->buffer_file_type = Qnil;
454 455
  b->invisibility_spec = Qt;

Roland McGrath's avatar
Roland McGrath committed
456 457 458 459 460 461 462 463 464 465 466 467 468 469
#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);
470
       offset += sizeof (Lisp_Object)) /* sizeof EMACS_INT == sizeof Lisp_Object */
471 472 473 474 475 476
    {
      int flag = XINT (*(Lisp_Object *)(offset + (char *)&buffer_local_flags));
      if (flag > 0 || flag == -2)
	*(Lisp_Object *)(offset + (char *)b) =
	  *(Lisp_Object *)(offset + (char *)&buffer_defaults);
    }
Roland McGrath's avatar
Roland McGrath committed
477 478
}

Roland McGrath's avatar
Roland McGrath committed
479 480 481 482 483
/* 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,
484
  1, 2, 0,
Roland McGrath's avatar
Roland McGrath committed
485 486
  "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
487
Otherwise modify name by appending `<NUMBER>', incrementing NUMBER\n\
488
until an unused name is found, and then return that name.\n\
489
Optional second argument IGNORE specifies a name that is okay to use\n\
490
\(if it is in the sequence to be tried)\n\
491
even if a buffer with that name exists.")
492 493
 (name, ignore)
     register Lisp_Object name, ignore;
Roland McGrath's avatar
Roland McGrath committed
494 495 496 497 498 499 500 501
{
  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
502
  if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
503
    return name;
Roland McGrath's avatar
Roland McGrath committed
504 505 506 507 508 509

  count = 1;
  while (1)
    {
      sprintf (number, "<%d>", ++count);
      gentemp = concat2 (name, build_string (number));
510
      tem = Fstring_equal (gentemp, ignore);
511 512
      if (!NILP (tem))
	return gentemp;
Roland McGrath's avatar
Roland McGrath committed
513
      tem = Fget_buffer (gentemp);
Jim Blandy's avatar
Jim Blandy committed
514
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
515
	return gentemp;
Roland McGrath's avatar
Roland McGrath committed
516 517 518 519 520 521
    }
}


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
522
With no argument or nil as argument, return the name of the current buffer.")
Roland McGrath's avatar
Roland McGrath committed
523 524 525
  (buffer)
     register Lisp_Object buffer;
{
Jim Blandy's avatar
Jim Blandy committed
526
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
527 528 529 530 531 532 533 534 535 536 537
    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
538
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
539 540 541 542 543
    return current_buffer->filename;
  CHECK_BUFFER (buffer, 0);
  return XBUFFER (buffer)->filename;
}

544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
DEFUN ("buffer-base-buffer", Fbuffer_base_buffer, Sbuffer_base_buffer,
       0, 1, 0,
  "Return the base buffer of indirect buffer BUFFER.\n\
If BUFFER is not indirect, return nil.")
  (buffer)
     register Lisp_Object buffer;
{
  struct buffer *base;
  Lisp_Object base_buffer;

  if (NILP (buffer))
    base = current_buffer->base_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      base = XBUFFER (buffer)->base_buffer;
    }

  if (! base)
    return Qnil;
  XSETBUFFER (base_buffer, base);
  return base_buffer;
}

Roland McGrath's avatar
Roland McGrath committed
568 569 570
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\
571 572
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
573 574 575 576 577 578
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;
579
  register Lisp_Object result;
Roland McGrath's avatar
Roland McGrath committed
580

Jim Blandy's avatar
Jim Blandy committed
581
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
582 583 584 585 586 587 588
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

589 590
  result = Qnil;

Roland McGrath's avatar
Roland McGrath committed
591
  {
592 593
    register Lisp_Object tail;
    for (tail = buf->local_var_alist; CONSP (tail); tail = XCONS (tail)->cdr)
Roland McGrath's avatar
Roland McGrath committed
594
      {
595 596 597 598
	Lisp_Object val, elt;

	elt = XCONS (tail)->car;

599 600 601 602 603 604 605 606
	/* Reference each variable in the alist in buf.
	   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.  */
	val = find_symbol_value (XCONS (elt)->car);
	/* Use the current buffer value only if buf is the current buffer.  */
	if (buf != current_buffer)
607 608 609 610 611 612 613 614
	  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
615 616 617 618 619 620 621 622 623
      }
  }

  /* 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);
624
	 offset += (sizeof (EMACS_INT))) /* sizeof EMACS_INT == sizeof Lisp_Object */
Roland McGrath's avatar
Roland McGrath committed
625
      {
626
	mask = XINT (*(Lisp_Object *)(offset + (char *)&buffer_local_flags));
Roland McGrath's avatar
Roland McGrath committed
627
	if (mask == -1 || (buf->local_var_flags & mask))
628 629 630 631
	  if (SYMBOLP (*(Lisp_Object *)(offset
					+ (char *)&buffer_local_symbols)))
	    result = Fcons (Fcons (*((Lisp_Object *)
				     (offset + (char *)&buffer_local_symbols)),
632 633
				   *(Lisp_Object *)(offset + (char *)buf)),
			    result);
Roland McGrath's avatar
Roland McGrath committed
634 635
      }
  }
636 637

  return result;
Roland McGrath's avatar
Roland McGrath committed
638 639 640 641 642 643 644 645 646 647 648
}


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
649
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
650 651 652 653 654 655 656
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

657
  return BUF_SAVE_MODIFF (buf) < BUF_MODIFF (buf) ? Qt : Qnil;
Roland McGrath's avatar
Roland McGrath committed
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
}

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
675
  if (!NILP (fn))
Roland McGrath's avatar
Roland McGrath committed
676
    {
677
      already = SAVE_MODIFF < MODIFF;
Jim Blandy's avatar
Jim Blandy committed
678
      if (!already && !NILP (flag))
Roland McGrath's avatar
Roland McGrath committed
679
	lock_file (fn);
Jim Blandy's avatar
Jim Blandy committed
680
      else if (already && NILP (flag))
Roland McGrath's avatar
Roland McGrath committed
681 682 683 684
	unlock_file (fn);
    }
#endif /* CLASH_DETECTION */

685
  SAVE_MODIFF = NILP (flag) ? MODIFF : 0;
Roland McGrath's avatar
Roland McGrath committed
686 687 688 689 690 691 692 693 694 695 696 697 698 699
  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
700
  if (NILP (buffer))
Roland McGrath's avatar
Roland McGrath committed
701 702 703 704 705 706 707 708 709 710
    buf = current_buffer;
  else
    {
      CHECK_BUFFER (buffer, 0);
      buf = XBUFFER (buffer);
    }

  return make_number (BUF_MODIFF (buf));
}

Roland McGrath's avatar
Roland McGrath committed
711
DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 2,
712
       "sRename buffer (to new name): \nP",
Roland McGrath's avatar
Roland McGrath committed
713
  "Change current buffer's name to NEWNAME (a string).\n\
714
If second arg UNIQUE is nil or omitted, it is an error if a\n\
Roland McGrath's avatar
Roland McGrath committed
715
buffer named NEWNAME already exists.\n\
716
If UNIQUE is non-nil, come up with a new name using\n\
Roland McGrath's avatar
Roland McGrath committed
717
`generate-new-buffer-name'.\n\
718 719
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
720
This does not change the name of the visited file (if any).")
721 722
  (newname, unique)
     register Lisp_Object newname, unique;
Roland McGrath's avatar
Roland McGrath committed
723 724 725
{
  register Lisp_Object tem, buf;

726
  CHECK_STRING (newname, 0);
727

728
  if (XSTRING (newname)->size == 0)
729 730
    error ("Empty string is invalid as a buffer name");

731
  tem = Fget_buffer (newname);
732 733 734
  /* 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
735
     (rename-buffer (generate-new-buffer-name NEWNAME)).  */
736
  if (NILP (unique) && XBUFFER (tem) == current_buffer)
737
    return current_buffer->name;
Jim Blandy's avatar
Jim Blandy committed
738
  if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
739
    {
740
      if (!NILP (unique))
741
	newname = Fgenerate_new_buffer_name (newname, current_buffer->name);
Roland McGrath's avatar
Roland McGrath committed
742
      else
743
	error ("Buffer name `%s' is in use", XSTRING (newname)->data);
Roland McGrath's avatar
Roland McGrath committed
744
    }
Roland McGrath's avatar
Roland McGrath committed
745

746
  current_buffer->name = newname;
747 748 749 750 751

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

752
  XSETBUFFER (buf, current_buffer);
753
  Fsetcar (Frassq (buf, Vbuffer_alist), newname);
754 755
  if (NILP (current_buffer->filename)
      && !NILP (current_buffer->auto_save_file_name))
Roland McGrath's avatar
Roland McGrath committed
756
    call0 (intern ("rename-auto-save-file"));
757 758
  /* Refetch since that last call may have done GC.  */
  return current_buffer->name;
Roland McGrath's avatar
Roland McGrath committed
759 760
}

761
DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 2, 0,
Roland McGrath's avatar
Roland McGrath committed
762
  "Return most recently selected buffer other than BUFFER.\n\
763 764
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
765 766
If no other buffer exists, the buffer `*scratch*' is returned.\n\
If BUFFER is omitted or nil, some interesting buffer is returned.")
767 768
  (buffer, visible_ok)
     register Lisp_Object buffer, visible_ok;
Roland McGrath's avatar
Roland McGrath committed
769 770 771 772
{
  register Lisp_Object tail, buf, notsogood, tem;
  notsogood = Qnil;

Jim Blandy's avatar
Jim Blandy committed
773
  for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail))
Roland McGrath's avatar
Roland McGrath committed
774 775 776 777 778 779
    {
      buf = Fcdr (Fcar (tail));
      if (EQ (buf, buffer))
	continue;
      if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ')
	continue;
780 781 782 783 784 785 786 787 788 789 790 791
#ifdef MULTI_FRAME
      /* If the selected frame has a buffer_predicate,
	 disregard buffers that don't fit the predicate.  */
      tem = frame_buffer_predicate ();
      if (!NILP (tem))
	{
	  tem = call1 (tem, buf);
	  if (NILP (tem))
	    continue;
	}
#endif

792
      if (NILP (visible_ok))
793
	tem = Fget_buffer_window (buf, Qt);
794 795
      else
	tem = Qnil;
Jim Blandy's avatar
Jim Blandy committed
796
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
797
	return buf;
Jim Blandy's avatar
Jim Blandy committed
798
      if (NILP (notsogood))
Roland McGrath's avatar
Roland McGrath committed
799 800
	notsogood = buf;
    }
Jim Blandy's avatar
Jim Blandy committed
801
  if (!NILP (notsogood))
Roland McGrath's avatar
Roland McGrath committed
802 803 804 805
    return notsogood;
  return Fget_buffer_create (build_string ("*scratch*"));
}

806
DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, Sbuffer_disable_undo, 0, 1,
Roland McGrath's avatar
Roland McGrath committed
807
0,
808 809
  "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
810 811
  (buffer)
     register Lisp_Object buffer;
Roland McGrath's avatar
Roland McGrath committed
812
{
Jim Blandy's avatar
Jim Blandy committed
813 814 815
  Lisp_Object real_buffer;

  if (NILP (buffer))
816
    XSETBUFFER (real_buffer, current_buffer);
Jim Blandy's avatar
Jim Blandy committed
817 818 819 820 821 822 823 824 825
  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
826 827 828 829 830 831 832
  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
833 834
  (buffer)
     register Lisp_Object buffer;
Roland McGrath's avatar
Roland McGrath committed
835
{
Jim Blandy's avatar
Jim Blandy committed
836
  Lisp_Object real_buffer;
Roland McGrath's avatar
Roland McGrath committed
837

Jim Blandy's avatar
Jim Blandy committed
838
  if (NILP (buffer))
839
    XSETBUFFER (real_buffer, current_buffer);
Roland McGrath's avatar
Roland McGrath committed
840 841
  else
    {
Jim Blandy's avatar
Jim Blandy committed
842 843 844
      real_buffer = Fget_buffer (buffer);
      if (NILP (real_buffer))
	nsberror (buffer);
Roland McGrath's avatar
Roland McGrath committed
845 846
    }

Jim Blandy's avatar
Jim Blandy committed
847 848
  if (EQ (XBUFFER (real_buffer)->undo_list, Qt))
    XBUFFER (real_buffer)->undo_list = Qnil;
Roland McGrath's avatar
Roland McGrath committed
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878

  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
879
  if (NILP (bufname))
Roland McGrath's avatar
Roland McGrath committed
880 881 882
    buf = Fcurrent_buffer ();
  else
    buf = Fget_buffer (bufname);
Jim Blandy's avatar
Jim Blandy committed
883
  if (NILP (buf))
Roland McGrath's avatar
Roland McGrath committed
884 885 886 887 888
    nsberror (bufname);

  b = XBUFFER (buf);

  /* Query if the buffer is still modified.  */
Jim Blandy's avatar
Jim Blandy committed
889
  if (INTERACTIVE && !NILP (b->filename)
890
      && BUF_MODIFF (b) > BUF_SAVE_MODIFF (b))
Roland McGrath's avatar
Roland McGrath committed
891 892 893 894 895
    {
      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
896
      if (NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
897 898 899
	return Qnil;
    }

900
  /* Run hooks with the buffer to be killed the current buffer.  */
Roland McGrath's avatar
Roland McGrath committed
901 902 903
  {
    register Lisp_Object val;
    int count = specpdl_ptr - specpdl;
904
    Lisp_Object list;
Roland McGrath's avatar
Roland McGrath committed
905 906 907

    record_unwind_protect (save_excursion_restore, save_excursion_save ());
    set_buffer_internal (b);
908 909 910 911 912 913 914 915 916 917 918

    /* 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.  */
919 920
    if (!NILP (Vrun_hooks))
      call1 (Vrun_hooks, Qkill_buffer_hook);
Roland McGrath's avatar
Roland McGrath committed
921 922 923 924 925 926 927 928 929 930 931
    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
932
  if (NILP (b->name))
Roland McGrath's avatar
Roland McGrath committed
933 934
    return Qnil;

935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
  /* When we kill a base buffer, kill all its indirect buffers.
     We do it at this stage so nothing terrible happens if they
     ask questions or their hooks get errors.  */
  if (! b->base_buffer)
    {
      struct buffer *other;

      GCPRO1 (buf);

      for (other = all_buffers; other; other = other->next)
	if (other->base_buffer == b)
	  {
	    Lisp_Object buf;
	    XSETBUFFER (buf, other);
	    Fkill_buffer (buf);
	  }

      UNGCPRO;
    }
  
Roland McGrath's avatar
Roland McGrath committed
955 956 957 958 959
  /* 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)
    {
960
      tem = Fother_buffer (buf, Qnil);
Roland McGrath's avatar
Roland McGrath committed
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
      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;

981
  /* Delete any auto-save file, if we saved it in this session.  */
982
  if (STRINGP (b->auto_save_file_name)
983
      && b->auto_save_modified != 0)
Roland McGrath's avatar
Roland McGrath committed
984 985 986
    {
      Lisp_Object tem;
      tem = Fsymbol_value (intern ("delete-auto-save-files"));
Jim Blandy's avatar
Jim Blandy committed
987
      if (! NILP (tem))
988
	internal_delete_file (b->auto_save_file_name);
Roland McGrath's avatar
Roland McGrath committed
989 990
    }

991
  if (! b->base_buffer)
Roland McGrath's avatar
Roland McGrath committed
992
    {
993 994 995 996 997 998 999 1000 1001 1002
      /* Unchain all markers of this buffer
	 and leave them pointing nowhere.  */
      for (tem = BUF_MARKERS (b); !EQ (tem, Qnil); )
	{
	  m = XMARKER (tem);
	  m->buffer = 0;
	  tem = m->chain;
	  m->chain = Qnil;
	}
      BUF_MARKERS (b) = Qnil;
Roland McGrath's avatar
Roland McGrath committed
1003

1004 1005 1006 1007 1008 1009
#ifdef USE_TEXT_PROPERTIES
      BUF_INTERVALS (b) = NULL_INTERVAL;
#endif

      /* Perhaps we should explicitly free the interval tree here... */
    }
1010

Roland McGrath's avatar
Roland McGrath committed
1011
  b->name = Qnil;
1012

1013
  BLOCK_INPUT;
1014 1015 1016
  if (! b->base_buffer)
    BUFFER_FREE (BUF_BEG_ADDR (b));

1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
  if (b->newline_cache)
    {
      free_region_cache (b->newline_cache);
      b->newline_cache = 0;
    }
  if (b->width_run_cache)
    {
      free_region_cache (b->width_run_cache);
      b->width_run_cache = 0;
    }
  b->width_table = Qnil;
1028
  UNBLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
1029 1030 1031 1032 1033
  b->undo_list = Qnil;

  return Qt;
}

Jim Blandy's avatar
Jim Blandy committed
1034 1035 1036 1037
/* 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
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051

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
1052 1053
  /* 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
1054

Jim Blandy's avatar
Jim Blandy committed
1055
  if (NILP (prev))
Roland McGrath's avatar
Roland McGrath committed
1056 1057 1058 1059 1060 1061 1062 1063
    Vbuffer_alist = XCONS (Vbuffer_alist)->cdr;
  else
    XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr;
	
  XCONS(link)->cdr = Vbuffer_alist;
  Vbuffer_alist = link;
}

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
DEFUN ("set-buffer-major-mode", Fset_buffer_major_mode, Sset_buffer_major_mode, 1, 1, 0,
  "Set an appropriate major mode for BUFFER, according to `default-major-mode'.\n\
Use this function before selecting the buffer, since it may need to inspect\n\
the current buffer's major mode.")
  (buf)
     Lisp_Object buf;
{
  int count;
  Lisp_Object function;

  function = buffer_defaults.major_mode;
  if (NILP (function) && NILP (Fget (current_buffer->major_mode, Qmode_class)))
    function = current_buffer->major_mode;

  if (NILP (function) || EQ (function, Qfundamental_mode))
    return Qnil;

  count = specpdl_ptr - specpdl;

  /* 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, Qnil);
}

Roland McGrath's avatar
Roland McGrath committed
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
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
1112
  if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
1113 1114
    error ("Cannot switch buffers in a dedicated window");

Jim Blandy's avatar
Jim Blandy committed
1115
  if (NILP (bufname))
1116
    buf = Fother_buffer (Fcurrent_buffer (), Qnil);
Roland McGrath's avatar
Roland McGrath committed
1117
  else
1118 1119 1120 1121 1122 1123 1124 1125
    {
      buf = Fget_buffer (bufname);
      if (NILP (buf))
	{
	  buf = Fget_buffer_create (bufname);
	  Fset_buffer_major_mode (buf);
	}
    }
Roland McGrath's avatar
Roland McGrath committed
1126
  Fset_buffer (buf);
Jim Blandy's avatar
Jim Blandy committed
1127
  if (NILP (norecord))
Roland McGrath's avatar
Roland McGrath committed
1128 1129 1130
    record_buffer (buf);

  Fset_window_buffer (EQ (selected_window, minibuf_window)
1131 1132
		      ? Fnext_window (minibuf_window, Qnil, Qnil)
		      : selected_window,
Roland McGrath's avatar
Roland McGrath committed
1133 1134
		      buf);

1135
  return buf;
Roland McGrath's avatar
Roland McGrath committed
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
}

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
1148
  if (NILP (bufname))
1149
    buf = Fother_buffer (Fcurrent_buffer (), Qnil);
Roland McGrath's avatar
Roland McGrath committed
1150
  else
1151 1152 1153 1154 1155 1156 1157 1158
    {
      buf = Fget_buffer (bufname);
      if (NILP (buf))
	{
	  buf = Fget_buffer_create (bufname);
	  Fset_buffer_major_mode (buf);
	}
    }
Roland McGrath's avatar
Roland McGrath committed
1159 1160 1161
  Fset_buffer (buf);
  record_buffer (buf);
  Fselect_window (Fdisplay_buffer (buf, other));
Richard M. Stallman's avatar