| 1 | /* Buffer manipulation primitives for GNU Emacs. |
| 2 | Copyright (C) 1985, 1986, 1987, 1988, 1989, 1993, 1994 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | 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) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/param.h> |
| 25 | |
| 26 | #ifndef MAXPATHLEN |
| 27 | /* in 4.1, param.h fails to define this. */ |
| 28 | #define MAXPATHLEN 1024 |
| 29 | #endif /* not MAXPATHLEN */ |
| 30 | |
| 31 | #include <config.h> |
| 32 | #include "lisp.h" |
| 33 | #include "intervals.h" |
| 34 | #include "window.h" |
| 35 | #include "commands.h" |
| 36 | #include "buffer.h" |
| 37 | #include "region-cache.h" |
| 38 | #include "indent.h" |
| 39 | #include "blockinput.h" |
| 40 | |
| 41 | struct buffer *current_buffer; /* the current buffer */ |
| 42 | |
| 43 | /* First buffer in chain of all buffers (in reverse order of creation). |
| 44 | Threaded through ->next. */ |
| 45 | |
| 46 | struct buffer *all_buffers; |
| 47 | |
| 48 | /* This structure holds the default values of the buffer-local variables |
| 49 | defined with DEFVAR_PER_BUFFER, that have special slots in each buffer. |
| 50 | The default value occupies the same slot in this structure |
| 51 | as an individual buffer's value occupies in that buffer. |
| 52 | Setting the default value also goes through the alist of buffers |
| 53 | and stores into each buffer that does not say it has a local value. */ |
| 54 | |
| 55 | struct buffer buffer_defaults; |
| 56 | |
| 57 | /* A Lisp_Object pointer to the above, used for staticpro */ |
| 58 | |
| 59 | static Lisp_Object Vbuffer_defaults; |
| 60 | |
| 61 | /* This structure marks which slots in a buffer have corresponding |
| 62 | default values in buffer_defaults. |
| 63 | Each such slot has a nonzero value in this structure. |
| 64 | The value has only one nonzero bit. |
| 65 | |
| 66 | When a buffer has its own local value for a slot, |
| 67 | the bit for that slot (found in the same slot in this structure) |
| 68 | is turned on in the buffer's local_var_flags slot. |
| 69 | |
| 70 | If a slot in this structure is -1, then even though there may |
| 71 | be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; |
| 72 | and the corresponding slot in buffer_defaults is not used. |
| 73 | |
| 74 | If a slot is -2, then there is no DEFVAR_PER_BUFFER for it, |
| 75 | but there is a default value which is copied into each buffer. |
| 76 | |
| 77 | If a slot in this structure is negative, then even though there may |
| 78 | be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; |
| 79 | and the corresponding slot in buffer_defaults is not used. |
| 80 | |
| 81 | If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is |
| 82 | zero, that is a bug */ |
| 83 | |
| 84 | struct buffer buffer_local_flags; |
| 85 | |
| 86 | /* This structure holds the names of symbols whose values may be |
| 87 | buffer-local. It is indexed and accessed in the same way as the above. */ |
| 88 | |
| 89 | struct buffer buffer_local_symbols; |
| 90 | /* A Lisp_Object pointer to the above, used for staticpro */ |
| 91 | static Lisp_Object Vbuffer_local_symbols; |
| 92 | |
| 93 | /* This structure holds the required types for the values in the |
| 94 | buffer-local slots. If a slot contains Qnil, then the |
| 95 | corresponding buffer slot may contain a value of any type. If a |
| 96 | slot contains an integer, then prospective values' tags must be |
| 97 | equal to that integer. When a tag does not match, the function |
| 98 | buffer_slot_type_mismatch will signal an error. */ |
| 99 | struct buffer buffer_local_types; |
| 100 | |
| 101 | Lisp_Object Fset_buffer (); |
| 102 | void set_buffer_internal (); |
| 103 | static void call_overlay_mod_hooks (); |
| 104 | |
| 105 | /* Alist of all buffer names vs the buffers. */ |
| 106 | /* This used to be a variable, but is no longer, |
| 107 | to prevent lossage due to user rplac'ing this alist or its elements. */ |
| 108 | Lisp_Object Vbuffer_alist; |
| 109 | |
| 110 | /* Functions to call before and after each text change. */ |
| 111 | Lisp_Object Vbefore_change_function; |
| 112 | Lisp_Object Vafter_change_function; |
| 113 | Lisp_Object Vbefore_change_functions; |
| 114 | Lisp_Object Vafter_change_functions; |
| 115 | |
| 116 | Lisp_Object Vtransient_mark_mode; |
| 117 | |
| 118 | /* t means ignore all read-only text properties. |
| 119 | A list means ignore such a property if its value is a member of the list. |
| 120 | Any non-nil value means ignore buffer-read-only. */ |
| 121 | Lisp_Object Vinhibit_read_only; |
| 122 | |
| 123 | /* List of functions to call that can query about killing a buffer. |
| 124 | If any of these functions returns nil, we don't kill it. */ |
| 125 | Lisp_Object Vkill_buffer_query_functions; |
| 126 | |
| 127 | /* List of functions to call before changing an unmodified buffer. */ |
| 128 | Lisp_Object Vfirst_change_hook; |
| 129 | Lisp_Object Qfirst_change_hook; |
| 130 | |
| 131 | Lisp_Object Qfundamental_mode, Qmode_class, Qpermanent_local; |
| 132 | |
| 133 | Lisp_Object Qprotected_field; |
| 134 | |
| 135 | Lisp_Object QSFundamental; /* A string "Fundamental" */ |
| 136 | |
| 137 | Lisp_Object Qkill_buffer_hook; |
| 138 | |
| 139 | Lisp_Object Qget_file_buffer; |
| 140 | |
| 141 | Lisp_Object Qoverlayp; |
| 142 | |
| 143 | Lisp_Object Qpriority, Qwindow, Qevaporate; |
| 144 | |
| 145 | Lisp_Object Qmodification_hooks; |
| 146 | Lisp_Object Qinsert_in_front_hooks; |
| 147 | Lisp_Object Qinsert_behind_hooks; |
| 148 | |
| 149 | /* For debugging; temporary. See set_buffer_internal. */ |
| 150 | /* Lisp_Object Qlisp_mode, Vcheck_symbol; */ |
| 151 | |
| 152 | nsberror (spec) |
| 153 | Lisp_Object spec; |
| 154 | { |
| 155 | if (STRINGP (spec)) |
| 156 | error ("No buffer named %s", XSTRING (spec)->data); |
| 157 | error ("Invalid buffer argument"); |
| 158 | } |
| 159 | \f |
| 160 | DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 0, 0, |
| 161 | "Return a list of all existing live buffers.") |
| 162 | () |
| 163 | { |
| 164 | return Fmapcar (Qcdr, Vbuffer_alist); |
| 165 | } |
| 166 | |
| 167 | DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0, |
| 168 | "Return the buffer named NAME (a string).\n\ |
| 169 | If there is no live buffer named NAME, return nil.\n\ |
| 170 | NAME may also be a buffer; if so, the value is that buffer.") |
| 171 | (name) |
| 172 | register Lisp_Object name; |
| 173 | { |
| 174 | if (BUFFERP (name)) |
| 175 | return name; |
| 176 | CHECK_STRING (name, 0); |
| 177 | |
| 178 | return Fcdr (Fassoc (name, Vbuffer_alist)); |
| 179 | } |
| 180 | |
| 181 | DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0, |
| 182 | "Return the buffer visiting file FILENAME (a string).\n\ |
| 183 | The buffer's `buffer-file-name' must match exactly the expansion of FILENAME.\n\ |
| 184 | If there is no such live buffer, return nil.\n\ |
| 185 | See also `find-buffer-visiting'.") |
| 186 | (filename) |
| 187 | register Lisp_Object filename; |
| 188 | { |
| 189 | register Lisp_Object tail, buf, tem; |
| 190 | Lisp_Object handler; |
| 191 | |
| 192 | CHECK_STRING (filename, 0); |
| 193 | filename = Fexpand_file_name (filename, Qnil); |
| 194 | |
| 195 | /* If the file name has special constructs in it, |
| 196 | call the corresponding file handler. */ |
| 197 | handler = Ffind_file_name_handler (filename, Qget_file_buffer); |
| 198 | if (!NILP (handler)) |
| 199 | return call2 (handler, Qget_file_buffer, filename); |
| 200 | |
| 201 | for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr) |
| 202 | { |
| 203 | buf = Fcdr (XCONS (tail)->car); |
| 204 | if (!BUFFERP (buf)) continue; |
| 205 | if (!STRINGP (XBUFFER (buf)->filename)) continue; |
| 206 | tem = Fstring_equal (XBUFFER (buf)->filename, filename); |
| 207 | if (!NILP (tem)) |
| 208 | return buf; |
| 209 | } |
| 210 | return Qnil; |
| 211 | } |
| 212 | |
| 213 | /* Incremented for each buffer created, to assign the buffer number. */ |
| 214 | int buffer_count; |
| 215 | |
| 216 | DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0, |
| 217 | "Return the buffer named NAME, or create such a buffer and return it.\n\ |
| 218 | 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\ |
| 220 | If NAME is a buffer instead of a string, then it is the value returned.\n\ |
| 221 | The value is never nil.") |
| 222 | (name) |
| 223 | register Lisp_Object name; |
| 224 | { |
| 225 | register Lisp_Object buf; |
| 226 | register struct buffer *b; |
| 227 | |
| 228 | buf = Fget_buffer (name); |
| 229 | if (!NILP (buf)) |
| 230 | return buf; |
| 231 | |
| 232 | if (XSTRING (name)->size == 0) |
| 233 | error ("Empty string for buffer name is not allowed"); |
| 234 | |
| 235 | b = (struct buffer *) xmalloc (sizeof (struct buffer)); |
| 236 | |
| 237 | BUF_GAP_SIZE (b) = 20; |
| 238 | BLOCK_INPUT; |
| 239 | BUFFER_ALLOC (BUF_BEG_ADDR (b), BUF_GAP_SIZE (b)); |
| 240 | UNBLOCK_INPUT; |
| 241 | if (! BUF_BEG_ADDR (b)) |
| 242 | memory_full (); |
| 243 | |
| 244 | BUF_PT (b) = 1; |
| 245 | BUF_GPT (b) = 1; |
| 246 | BUF_BEGV (b) = 1; |
| 247 | BUF_ZV (b) = 1; |
| 248 | BUF_Z (b) = 1; |
| 249 | BUF_MODIFF (b) = 1; |
| 250 | |
| 251 | b->newline_cache = 0; |
| 252 | b->width_run_cache = 0; |
| 253 | b->width_table = Qnil; |
| 254 | |
| 255 | /* Put this on the chain of all buffers including killed ones. */ |
| 256 | b->next = all_buffers; |
| 257 | all_buffers = b; |
| 258 | |
| 259 | b->mark = Fmake_marker (); |
| 260 | /*b->number = make_number (++buffer_count);*/ |
| 261 | b->name = name; |
| 262 | if (XSTRING (name)->data[0] != ' ') |
| 263 | b->undo_list = Qnil; |
| 264 | else |
| 265 | b->undo_list = Qt; |
| 266 | |
| 267 | reset_buffer (b); |
| 268 | reset_buffer_local_variables (b); |
| 269 | |
| 270 | /* Put this in the alist of all live buffers. */ |
| 271 | XSETBUFFER (buf, b); |
| 272 | Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil)); |
| 273 | |
| 274 | b->mark = Fmake_marker (); |
| 275 | b->markers = Qnil; |
| 276 | b->name = name; |
| 277 | return buf; |
| 278 | } |
| 279 | |
| 280 | /* Reinitialize everything about a buffer except its name and contents |
| 281 | and local variables. */ |
| 282 | |
| 283 | void |
| 284 | reset_buffer (b) |
| 285 | register struct buffer *b; |
| 286 | { |
| 287 | b->filename = Qnil; |
| 288 | b->directory = (current_buffer) ? current_buffer->directory : Qnil; |
| 289 | b->modtime = 0; |
| 290 | b->save_modified = 1; |
| 291 | XSETFASTINT (b->save_length, 0); |
| 292 | b->last_window_start = 1; |
| 293 | b->backed_up = Qnil; |
| 294 | b->auto_save_modified = 0; |
| 295 | b->auto_save_failure_time = -1; |
| 296 | b->auto_save_file_name = Qnil; |
| 297 | b->read_only = Qnil; |
| 298 | b->overlays_before = Qnil; |
| 299 | b->overlays_after = Qnil; |
| 300 | XSETFASTINT (b->overlay_center, 1); |
| 301 | b->mark_active = Qnil; |
| 302 | |
| 303 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
| 304 | INITIALIZE_INTERVAL (b, NULL_INTERVAL); |
| 305 | } |
| 306 | |
| 307 | /* Reset buffer B's local variables info. |
| 308 | Don't use this on a buffer that has already been in use; |
| 309 | it does not treat permanent locals consistently. |
| 310 | Instead, use Fkill_all_local_variables. */ |
| 311 | |
| 312 | reset_buffer_local_variables (b) |
| 313 | register struct buffer *b; |
| 314 | { |
| 315 | register int offset; |
| 316 | |
| 317 | /* Reset the major mode to Fundamental, together with all the |
| 318 | things that depend on the major mode. |
| 319 | default-major-mode is handled at a higher level. |
| 320 | We ignore it here. */ |
| 321 | b->major_mode = Qfundamental_mode; |
| 322 | b->keymap = Qnil; |
| 323 | b->abbrev_table = Vfundamental_mode_abbrev_table; |
| 324 | b->mode_name = QSFundamental; |
| 325 | b->minor_modes = Qnil; |
| 326 | b->downcase_table = Vascii_downcase_table; |
| 327 | b->upcase_table = Vascii_upcase_table; |
| 328 | b->case_canon_table = Vascii_canon_table; |
| 329 | b->case_eqv_table = Vascii_eqv_table; |
| 330 | #if 0 |
| 331 | b->sort_table = XSTRING (Vascii_sort_table); |
| 332 | b->folding_sort_table = XSTRING (Vascii_folding_sort_table); |
| 333 | #endif /* 0 */ |
| 334 | |
| 335 | /* Reset all per-buffer variables to their defaults. */ |
| 336 | b->local_var_alist = Qnil; |
| 337 | b->local_var_flags = 0; |
| 338 | |
| 339 | /* For each slot that has a default value, |
| 340 | copy that into the slot. */ |
| 341 | |
| 342 | for (offset = (char *)&buffer_local_flags.name - (char *)&buffer_local_flags; |
| 343 | offset < sizeof (struct buffer); |
| 344 | offset += sizeof (Lisp_Object)) /* sizeof EMACS_INT == sizeof Lisp_Object */ |
| 345 | { |
| 346 | int flag = XINT (*(Lisp_Object *)(offset + (char *)&buffer_local_flags)); |
| 347 | if (flag > 0 || flag == -2) |
| 348 | *(Lisp_Object *)(offset + (char *)b) = |
| 349 | *(Lisp_Object *)(offset + (char *)&buffer_defaults); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | /* We split this away from generate-new-buffer, because rename-buffer |
| 354 | and set-visited-file-name ought to be able to use this to really |
| 355 | rename the buffer properly. */ |
| 356 | |
| 357 | DEFUN ("generate-new-buffer-name", Fgenerate_new_buffer_name, Sgenerate_new_buffer_name, |
| 358 | 1, 2, 0, |
| 359 | "Return a string that is the name of no existing buffer based on NAME.\n\ |
| 360 | If there is no live buffer named NAME, then return NAME.\n\ |
| 361 | Otherwise modify name by appending `<NUMBER>', incrementing NUMBER\n\ |
| 362 | until an unused name is found, and then return that name.\n\ |
| 363 | Optional second argument IGNORE specifies a name that is okay to use\n\ |
| 364 | \(if it is in the sequence to be tried)\n\ |
| 365 | even if a buffer with that name exists.") |
| 366 | (name, ignore) |
| 367 | register Lisp_Object name, ignore; |
| 368 | { |
| 369 | register Lisp_Object gentemp, tem; |
| 370 | int count; |
| 371 | char number[10]; |
| 372 | |
| 373 | CHECK_STRING (name, 0); |
| 374 | |
| 375 | tem = Fget_buffer (name); |
| 376 | if (NILP (tem)) |
| 377 | return name; |
| 378 | |
| 379 | count = 1; |
| 380 | while (1) |
| 381 | { |
| 382 | sprintf (number, "<%d>", ++count); |
| 383 | gentemp = concat2 (name, build_string (number)); |
| 384 | tem = Fstring_equal (gentemp, ignore); |
| 385 | if (!NILP (tem)) |
| 386 | return gentemp; |
| 387 | tem = Fget_buffer (gentemp); |
| 388 | if (NILP (tem)) |
| 389 | return gentemp; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | \f |
| 394 | DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0, |
| 395 | "Return the name of BUFFER, as a string.\n\ |
| 396 | With no argument or nil as argument, return the name of the current buffer.") |
| 397 | (buffer) |
| 398 | register Lisp_Object buffer; |
| 399 | { |
| 400 | if (NILP (buffer)) |
| 401 | return current_buffer->name; |
| 402 | CHECK_BUFFER (buffer, 0); |
| 403 | return XBUFFER (buffer)->name; |
| 404 | } |
| 405 | |
| 406 | DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0, |
| 407 | "Return name of file BUFFER is visiting, or nil if none.\n\ |
| 408 | No argument or nil as argument means use the current buffer.") |
| 409 | (buffer) |
| 410 | register Lisp_Object buffer; |
| 411 | { |
| 412 | if (NILP (buffer)) |
| 413 | return current_buffer->filename; |
| 414 | CHECK_BUFFER (buffer, 0); |
| 415 | return XBUFFER (buffer)->filename; |
| 416 | } |
| 417 | |
| 418 | DEFUN ("buffer-local-variables", Fbuffer_local_variables, |
| 419 | Sbuffer_local_variables, 0, 1, 0, |
| 420 | "Return an alist of variables that are buffer-local in BUFFER.\n\ |
| 421 | Most elements look like (SYMBOL . VALUE), describing one variable.\n\ |
| 422 | For a symbol that is locally unbound, just the symbol appears in the value.\n\ |
| 423 | Note that storing new VALUEs in these elements doesn't change the variables.\n\ |
| 424 | No argument or nil as argument means use current buffer as BUFFER.") |
| 425 | (buffer) |
| 426 | register Lisp_Object buffer; |
| 427 | { |
| 428 | register struct buffer *buf; |
| 429 | register Lisp_Object result; |
| 430 | |
| 431 | if (NILP (buffer)) |
| 432 | buf = current_buffer; |
| 433 | else |
| 434 | { |
| 435 | CHECK_BUFFER (buffer, 0); |
| 436 | buf = XBUFFER (buffer); |
| 437 | } |
| 438 | |
| 439 | result = Qnil; |
| 440 | |
| 441 | { |
| 442 | /* Reference each variable in the alist in our current buffer. |
| 443 | If inquiring about the current buffer, this gets the current values, |
| 444 | so store them into the alist so the alist is up to date. |
| 445 | If inquiring about some other buffer, this swaps out any values |
| 446 | for that buffer, making the alist up to date automatically. */ |
| 447 | register Lisp_Object tail; |
| 448 | for (tail = buf->local_var_alist; CONSP (tail); tail = XCONS (tail)->cdr) |
| 449 | { |
| 450 | Lisp_Object val, elt; |
| 451 | |
| 452 | elt = XCONS (tail)->car; |
| 453 | |
| 454 | if (buf == current_buffer) |
| 455 | val = find_symbol_value (XCONS (elt)->car); |
| 456 | else |
| 457 | val = XCONS (elt)->cdr; |
| 458 | |
| 459 | /* If symbol is unbound, put just the symbol in the list. */ |
| 460 | if (EQ (val, Qunbound)) |
| 461 | result = Fcons (XCONS (elt)->car, result); |
| 462 | /* Otherwise, put (symbol . value) in the list. */ |
| 463 | else |
| 464 | result = Fcons (Fcons (XCONS (elt)->car, val), result); |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /* Add on all the variables stored in special slots. */ |
| 469 | { |
| 470 | register int offset, mask; |
| 471 | |
| 472 | for (offset = (char *)&buffer_local_symbols.name - (char *)&buffer_local_symbols; |
| 473 | offset < sizeof (struct buffer); |
| 474 | offset += (sizeof (EMACS_INT))) /* sizeof EMACS_INT == sizeof Lisp_Object */ |
| 475 | { |
| 476 | mask = XINT (*(Lisp_Object *)(offset + (char *)&buffer_local_flags)); |
| 477 | if (mask == -1 || (buf->local_var_flags & mask)) |
| 478 | if (SYMBOLP (*(Lisp_Object *)(offset |
| 479 | + (char *)&buffer_local_symbols))) |
| 480 | result = Fcons (Fcons (*((Lisp_Object *) |
| 481 | (offset + (char *)&buffer_local_symbols)), |
| 482 | *(Lisp_Object *)(offset + (char *)buf)), |
| 483 | result); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | return result; |
| 488 | } |
| 489 | |
| 490 | \f |
| 491 | DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p, |
| 492 | 0, 1, 0, |
| 493 | "Return t if BUFFER was modified since its file was last read or saved.\n\ |
| 494 | No argument or nil as argument means use current buffer as BUFFER.") |
| 495 | (buffer) |
| 496 | register Lisp_Object buffer; |
| 497 | { |
| 498 | register struct buffer *buf; |
| 499 | if (NILP (buffer)) |
| 500 | buf = current_buffer; |
| 501 | else |
| 502 | { |
| 503 | CHECK_BUFFER (buffer, 0); |
| 504 | buf = XBUFFER (buffer); |
| 505 | } |
| 506 | |
| 507 | return buf->save_modified < BUF_MODIFF (buf) ? Qt : Qnil; |
| 508 | } |
| 509 | |
| 510 | DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p, |
| 511 | 1, 1, 0, |
| 512 | "Mark current buffer as modified or unmodified according to FLAG.\n\ |
| 513 | A non-nil FLAG means mark the buffer modified.") |
| 514 | (flag) |
| 515 | register Lisp_Object flag; |
| 516 | { |
| 517 | register int already; |
| 518 | register Lisp_Object fn; |
| 519 | |
| 520 | #ifdef CLASH_DETECTION |
| 521 | /* If buffer becoming modified, lock the file. |
| 522 | If buffer becoming unmodified, unlock the file. */ |
| 523 | |
| 524 | fn = current_buffer->filename; |
| 525 | if (!NILP (fn)) |
| 526 | { |
| 527 | already = current_buffer->save_modified < MODIFF; |
| 528 | if (!already && !NILP (flag)) |
| 529 | lock_file (fn); |
| 530 | else if (already && NILP (flag)) |
| 531 | unlock_file (fn); |
| 532 | } |
| 533 | #endif /* CLASH_DETECTION */ |
| 534 | |
| 535 | current_buffer->save_modified = NILP (flag) ? MODIFF : 0; |
| 536 | update_mode_lines++; |
| 537 | return flag; |
| 538 | } |
| 539 | |
| 540 | DEFUN ("buffer-modified-tick", Fbuffer_modified_tick, Sbuffer_modified_tick, |
| 541 | 0, 1, 0, |
| 542 | "Return BUFFER's tick counter, incremented for each change in text.\n\ |
| 543 | Each buffer has a tick counter which is incremented each time the text in\n\ |
| 544 | that buffer is changed. It wraps around occasionally.\n\ |
| 545 | No argument or nil as argument means use current buffer as BUFFER.") |
| 546 | (buffer) |
| 547 | register Lisp_Object buffer; |
| 548 | { |
| 549 | register struct buffer *buf; |
| 550 | if (NILP (buffer)) |
| 551 | buf = current_buffer; |
| 552 | else |
| 553 | { |
| 554 | CHECK_BUFFER (buffer, 0); |
| 555 | buf = XBUFFER (buffer); |
| 556 | } |
| 557 | |
| 558 | return make_number (BUF_MODIFF (buf)); |
| 559 | } |
| 560 | \f |
| 561 | DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 2, |
| 562 | "sRename buffer (to new name): \nP", |
| 563 | "Change current buffer's name to NEWNAME (a string).\n\ |
| 564 | If second arg UNIQUE is nil or omitted, it is an error if a\n\ |
| 565 | buffer named NEWNAME already exists.\n\ |
| 566 | If UNIQUE is non-nil, come up with a new name using\n\ |
| 567 | `generate-new-buffer-name'.\n\ |
| 568 | Interactively, you can set UNIQUE with a prefix argument.\n\ |
| 569 | We return the name we actually gave the buffer.\n\ |
| 570 | This does not change the name of the visited file (if any).") |
| 571 | (newname, unique) |
| 572 | register Lisp_Object newname, unique; |
| 573 | { |
| 574 | register Lisp_Object tem, buf; |
| 575 | |
| 576 | CHECK_STRING (newname, 0); |
| 577 | |
| 578 | if (XSTRING (newname)->size == 0) |
| 579 | error ("Empty string is invalid as a buffer name"); |
| 580 | |
| 581 | tem = Fget_buffer (newname); |
| 582 | /* Don't short-circuit if UNIQUE is t. That is a useful way to rename |
| 583 | the buffer automatically so you can create another with the original name. |
| 584 | It makes UNIQUE equivalent to |
| 585 | (rename-buffer (generate-new-buffer-name NEWNAME)). */ |
| 586 | if (NILP (unique) && XBUFFER (tem) == current_buffer) |
| 587 | return current_buffer->name; |
| 588 | if (!NILP (tem)) |
| 589 | { |
| 590 | if (!NILP (unique)) |
| 591 | newname = Fgenerate_new_buffer_name (newname, current_buffer->name); |
| 592 | else |
| 593 | error ("Buffer name `%s' is in use", XSTRING (newname)->data); |
| 594 | } |
| 595 | |
| 596 | current_buffer->name = newname; |
| 597 | |
| 598 | /* Catch redisplay's attention. Unless we do this, the mode lines for |
| 599 | any windows displaying current_buffer will stay unchanged. */ |
| 600 | update_mode_lines++; |
| 601 | |
| 602 | XSETBUFFER (buf, current_buffer); |
| 603 | Fsetcar (Frassq (buf, Vbuffer_alist), newname); |
| 604 | if (NILP (current_buffer->filename) |
| 605 | && !NILP (current_buffer->auto_save_file_name)) |
| 606 | call0 (intern ("rename-auto-save-file")); |
| 607 | /* Refetch since that last call may have done GC. */ |
| 608 | return current_buffer->name; |
| 609 | } |
| 610 | |
| 611 | DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 2, 0, |
| 612 | "Return most recently selected buffer other than BUFFER.\n\ |
| 613 | Buffers not visible in windows are preferred to visible buffers,\n\ |
| 614 | unless optional second argument VISIBLE-OK is non-nil.\n\ |
| 615 | If no other buffer exists, the buffer `*scratch*' is returned.\n\ |
| 616 | If BUFFER is omitted or nil, some interesting buffer is returned.") |
| 617 | (buffer, visible_ok) |
| 618 | register Lisp_Object buffer, visible_ok; |
| 619 | { |
| 620 | register Lisp_Object tail, buf, notsogood, tem; |
| 621 | notsogood = Qnil; |
| 622 | |
| 623 | for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail)) |
| 624 | { |
| 625 | buf = Fcdr (Fcar (tail)); |
| 626 | if (EQ (buf, buffer)) |
| 627 | continue; |
| 628 | if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ') |
| 629 | continue; |
| 630 | if (NILP (visible_ok)) |
| 631 | tem = Fget_buffer_window (buf, Qt); |
| 632 | else |
| 633 | tem = Qnil; |
| 634 | if (NILP (tem)) |
| 635 | return buf; |
| 636 | if (NILP (notsogood)) |
| 637 | notsogood = buf; |
| 638 | } |
| 639 | if (!NILP (notsogood)) |
| 640 | return notsogood; |
| 641 | return Fget_buffer_create (build_string ("*scratch*")); |
| 642 | } |
| 643 | \f |
| 644 | DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, Sbuffer_disable_undo, 0, 1, |
| 645 | 0, |
| 646 | "Make BUFFER stop keeping undo information.\n\ |
| 647 | No argument or nil as argument means do this for the current buffer.") |
| 648 | (buffer) |
| 649 | register Lisp_Object buffer; |
| 650 | { |
| 651 | Lisp_Object real_buffer; |
| 652 | |
| 653 | if (NILP (buffer)) |
| 654 | XSETBUFFER (real_buffer, current_buffer); |
| 655 | else |
| 656 | { |
| 657 | real_buffer = Fget_buffer (buffer); |
| 658 | if (NILP (real_buffer)) |
| 659 | nsberror (buffer); |
| 660 | } |
| 661 | |
| 662 | XBUFFER (real_buffer)->undo_list = Qt; |
| 663 | |
| 664 | return Qnil; |
| 665 | } |
| 666 | |
| 667 | DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo, |
| 668 | 0, 1, "", |
| 669 | "Start keeping undo information for buffer BUFFER.\n\ |
| 670 | No argument or nil as argument means do this for the current buffer.") |
| 671 | (buffer) |
| 672 | register Lisp_Object buffer; |
| 673 | { |
| 674 | Lisp_Object real_buffer; |
| 675 | |
| 676 | if (NILP (buffer)) |
| 677 | XSETBUFFER (real_buffer, current_buffer); |
| 678 | else |
| 679 | { |
| 680 | real_buffer = Fget_buffer (buffer); |
| 681 | if (NILP (real_buffer)) |
| 682 | nsberror (buffer); |
| 683 | } |
| 684 | |
| 685 | if (EQ (XBUFFER (real_buffer)->undo_list, Qt)) |
| 686 | XBUFFER (real_buffer)->undo_list = Qnil; |
| 687 | |
| 688 | return Qnil; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | DEFVAR_LISP ("kill-buffer-hook", no_cell, "\ |
| 693 | Hook to be run (by `run-hooks', which see) when a buffer is killed.\n\ |
| 694 | The buffer being killed will be current while the hook is running.\n\ |
| 695 | See `kill-buffer'." |
| 696 | */ |
| 697 | DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 1, 1, "bKill buffer: ", |
| 698 | "Kill the buffer BUFFER.\n\ |
| 699 | The argument may be a buffer or may be the name of a buffer.\n\ |
| 700 | An argument of nil means kill the current buffer.\n\n\ |
| 701 | Value is t if the buffer is actually killed, nil if user says no.\n\n\ |
| 702 | The value of `kill-buffer-hook' (which may be local to that buffer),\n\ |
| 703 | if not void, is a list of functions to be called, with no arguments,\n\ |
| 704 | before the buffer is actually killed. The buffer to be killed is current\n\ |
| 705 | when the hook functions are called.\n\n\ |
| 706 | Any processes that have this buffer as the `process-buffer' are killed\n\ |
| 707 | with `delete-process'.") |
| 708 | (bufname) |
| 709 | Lisp_Object bufname; |
| 710 | { |
| 711 | Lisp_Object buf; |
| 712 | register struct buffer *b; |
| 713 | register Lisp_Object tem; |
| 714 | register struct Lisp_Marker *m; |
| 715 | struct gcpro gcpro1, gcpro2; |
| 716 | |
| 717 | if (NILP (bufname)) |
| 718 | buf = Fcurrent_buffer (); |
| 719 | else |
| 720 | buf = Fget_buffer (bufname); |
| 721 | if (NILP (buf)) |
| 722 | nsberror (bufname); |
| 723 | |
| 724 | b = XBUFFER (buf); |
| 725 | |
| 726 | /* Query if the buffer is still modified. */ |
| 727 | if (INTERACTIVE && !NILP (b->filename) |
| 728 | && BUF_MODIFF (b) > b->save_modified) |
| 729 | { |
| 730 | GCPRO2 (buf, bufname); |
| 731 | tem = do_yes_or_no_p (format1 ("Buffer %s modified; kill anyway? ", |
| 732 | XSTRING (b->name)->data)); |
| 733 | UNGCPRO; |
| 734 | if (NILP (tem)) |
| 735 | return Qnil; |
| 736 | } |
| 737 | |
| 738 | /* Run hooks with the buffer to be killed the current buffer. */ |
| 739 | { |
| 740 | register Lisp_Object val; |
| 741 | int count = specpdl_ptr - specpdl; |
| 742 | Lisp_Object list; |
| 743 | |
| 744 | record_unwind_protect (save_excursion_restore, save_excursion_save ()); |
| 745 | set_buffer_internal (b); |
| 746 | |
| 747 | /* First run the query functions; if any query is answered no, |
| 748 | don't kill the buffer. */ |
| 749 | for (list = Vkill_buffer_query_functions; !NILP (list); list = Fcdr (list)) |
| 750 | { |
| 751 | tem = call0 (Fcar (list)); |
| 752 | if (NILP (tem)) |
| 753 | return unbind_to (count, Qnil); |
| 754 | } |
| 755 | |
| 756 | /* Then run the hooks. */ |
| 757 | if (!NILP (Vrun_hooks)) |
| 758 | call1 (Vrun_hooks, Qkill_buffer_hook); |
| 759 | unbind_to (count, Qnil); |
| 760 | } |
| 761 | |
| 762 | /* We have no more questions to ask. Verify that it is valid |
| 763 | to kill the buffer. This must be done after the questions |
| 764 | since anything can happen within do_yes_or_no_p. */ |
| 765 | |
| 766 | /* Don't kill the minibuffer now current. */ |
| 767 | if (EQ (buf, XWINDOW (minibuf_window)->buffer)) |
| 768 | return Qnil; |
| 769 | |
| 770 | if (NILP (b->name)) |
| 771 | return Qnil; |
| 772 | |
| 773 | /* Make this buffer not be current. |
| 774 | In the process, notice if this is the sole visible buffer |
| 775 | and give up if so. */ |
| 776 | if (b == current_buffer) |
| 777 | { |
| 778 | tem = Fother_buffer (buf, Qnil); |
| 779 | Fset_buffer (tem); |
| 780 | if (b == current_buffer) |
| 781 | return Qnil; |
| 782 | } |
| 783 | |
| 784 | /* Now there is no question: we can kill the buffer. */ |
| 785 | |
| 786 | #ifdef CLASH_DETECTION |
| 787 | /* Unlock this buffer's file, if it is locked. */ |
| 788 | unlock_buffer (b); |
| 789 | #endif /* CLASH_DETECTION */ |
| 790 | |
| 791 | kill_buffer_processes (buf); |
| 792 | |
| 793 | tem = Vinhibit_quit; |
| 794 | Vinhibit_quit = Qt; |
| 795 | Vbuffer_alist = Fdelq (Frassq (buf, Vbuffer_alist), Vbuffer_alist); |
| 796 | Freplace_buffer_in_windows (buf); |
| 797 | Vinhibit_quit = tem; |
| 798 | |
| 799 | /* Delete any auto-save file, if we saved it in this session. */ |
| 800 | if (STRINGP (b->auto_save_file_name) |
| 801 | && b->auto_save_modified != 0) |
| 802 | { |
| 803 | Lisp_Object tem; |
| 804 | tem = Fsymbol_value (intern ("delete-auto-save-files")); |
| 805 | if (! NILP (tem)) |
| 806 | unlink (XSTRING (b->auto_save_file_name)->data); |
| 807 | } |
| 808 | |
| 809 | /* Unchain all markers of this buffer |
| 810 | and leave them pointing nowhere. */ |
| 811 | for (tem = b->markers; !EQ (tem, Qnil); ) |
| 812 | { |
| 813 | m = XMARKER (tem); |
| 814 | m->buffer = 0; |
| 815 | tem = m->chain; |
| 816 | m->chain = Qnil; |
| 817 | } |
| 818 | b->markers = Qnil; |
| 819 | |
| 820 | /* Only defined if Emacs is compiled with USE_TEXT_PROPERTIES */ |
| 821 | INITIALIZE_INTERVAL (b, NULL_INTERVAL); |
| 822 | /* Perhaps we should explicitly free the interval tree here... */ |
| 823 | |
| 824 | b->name = Qnil; |
| 825 | BLOCK_INPUT; |
| 826 | BUFFER_FREE (BUF_BEG_ADDR (b)); |
| 827 | if (b->newline_cache) |
| 828 | { |
| 829 | free_region_cache (b->newline_cache); |
| 830 | b->newline_cache = 0; |
| 831 | } |
| 832 | if (b->width_run_cache) |
| 833 | { |
| 834 | free_region_cache (b->width_run_cache); |
| 835 | b->width_run_cache = 0; |
| 836 | } |
| 837 | b->width_table = Qnil; |
| 838 | UNBLOCK_INPUT; |
| 839 | b->undo_list = Qnil; |
| 840 | |
| 841 | return Qt; |
| 842 | } |
| 843 | \f |
| 844 | /* Move the assoc for buffer BUF to the front of buffer-alist. Since |
| 845 | we do this each time BUF is selected visibly, the more recently |
| 846 | selected buffers are always closer to the front of the list. This |
| 847 | means that other_buffer is more likely to choose a relevant buffer. */ |
| 848 | |
| 849 | record_buffer (buf) |
| 850 | Lisp_Object buf; |
| 851 | { |
| 852 | register Lisp_Object link, prev; |
| 853 | |
| 854 | prev = Qnil; |
| 855 | for (link = Vbuffer_alist; CONSP (link); link = XCONS (link)->cdr) |
| 856 | { |
| 857 | if (EQ (XCONS (XCONS (link)->car)->cdr, buf)) |
| 858 | break; |
| 859 | prev = link; |
| 860 | } |
| 861 | |
| 862 | /* Effectively do Vbuffer_alist = Fdelq (link, Vbuffer_alist); |
| 863 | we cannot use Fdelq itself here because it allows quitting. */ |
| 864 | |
| 865 | if (NILP (prev)) |
| 866 | Vbuffer_alist = XCONS (Vbuffer_alist)->cdr; |
| 867 | else |
| 868 | XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr; |
| 869 | |
| 870 | XCONS(link)->cdr = Vbuffer_alist; |
| 871 | Vbuffer_alist = link; |
| 872 | } |
| 873 | |
| 874 | DEFUN ("set-buffer-major-mode", Fset_buffer_major_mode, Sset_buffer_major_mode, 1, 1, 0, |
| 875 | "Set an appropriate major mode for BUFFER, according to `default-major-mode'.\n\ |
| 876 | Use this function before selecting the buffer, since it may need to inspect\n\ |
| 877 | the current buffer's major mode.") |
| 878 | (buf) |
| 879 | Lisp_Object buf; |
| 880 | { |
| 881 | int count; |
| 882 | Lisp_Object function; |
| 883 | |
| 884 | function = buffer_defaults.major_mode; |
| 885 | if (NILP (function) && NILP (Fget (current_buffer->major_mode, Qmode_class))) |
| 886 | function = current_buffer->major_mode; |
| 887 | |
| 888 | if (NILP (function) || EQ (function, Qfundamental_mode)) |
| 889 | return Qnil; |
| 890 | |
| 891 | count = specpdl_ptr - specpdl; |
| 892 | |
| 893 | /* To select a nonfundamental mode, |
| 894 | select the buffer temporarily and then call the mode function. */ |
| 895 | |
| 896 | record_unwind_protect (save_excursion_restore, save_excursion_save ()); |
| 897 | |
| 898 | Fset_buffer (buf); |
| 899 | call0 (function); |
| 900 | |
| 901 | return unbind_to (count, Qnil); |
| 902 | } |
| 903 | |
| 904 | DEFUN ("switch-to-buffer", Fswitch_to_buffer, Sswitch_to_buffer, 1, 2, "BSwitch to buffer: ", |
| 905 | "Select buffer BUFFER in the current window.\n\ |
| 906 | BUFFER may be a buffer or a buffer name.\n\ |
| 907 | Optional second arg NORECORD non-nil means\n\ |
| 908 | do not put this buffer at the front of the list of recently selected ones.\n\ |
| 909 | \n\ |
| 910 | WARNING: This is NOT the way to work on another buffer temporarily\n\ |
| 911 | within a Lisp program! Use `set-buffer' instead. That avoids messing with\n\ |
| 912 | the window-buffer correspondences.") |
| 913 | (bufname, norecord) |
| 914 | Lisp_Object bufname, norecord; |
| 915 | { |
| 916 | register Lisp_Object buf; |
| 917 | Lisp_Object tem; |
| 918 | |
| 919 | if (EQ (minibuf_window, selected_window)) |
| 920 | error ("Cannot switch buffers in minibuffer window"); |
| 921 | tem = Fwindow_dedicated_p (selected_window); |
| 922 | if (!NILP (tem)) |
| 923 | error ("Cannot switch buffers in a dedicated window"); |
| 924 | |
| 925 | if (NILP (bufname)) |
| 926 | buf = Fother_buffer (Fcurrent_buffer (), Qnil); |
| 927 | else |
| 928 | { |
| 929 | buf = Fget_buffer (bufname); |
| 930 | if (NILP (buf)) |
| 931 | { |
| 932 | buf = Fget_buffer_create (bufname); |
| 933 | Fset_buffer_major_mode (buf); |
| 934 | } |
| 935 | } |
| 936 | Fset_buffer (buf); |
| 937 | if (NILP (norecord)) |
| 938 | record_buffer (buf); |
| 939 | |
| 940 | Fset_window_buffer (EQ (selected_window, minibuf_window) |
| 941 | ? Fnext_window (minibuf_window, Qnil, Qnil) |
| 942 | : selected_window, |
| 943 | buf); |
| 944 | |
| 945 | return buf; |
| 946 | } |
| 947 | |
| 948 | DEFUN ("pop-to-buffer", Fpop_to_buffer, Spop_to_buffer, 1, 2, 0, |
| 949 | "Select buffer BUFFER in some window, preferably a different one.\n\ |
| 950 | If BUFFER is nil, then some other buffer is chosen.\n\ |
| 951 | If `pop-up-windows' is non-nil, windows can be split to do this.\n\ |
| 952 | If optional second arg OTHER-WINDOW is non-nil, insist on finding another\n\ |
| 953 | window even if BUFFER is already visible in the selected window.") |
| 954 | (bufname, other) |
| 955 | Lisp_Object bufname, other; |
| 956 | { |
| 957 | register Lisp_Object buf; |
| 958 | if (NILP (bufname)) |
| 959 | buf = Fother_buffer (Fcurrent_buffer (), Qnil); |
| 960 | else |
| 961 | buf = Fget_buffer_create (bufname); |
| 962 | Fset_buffer (buf); |
| 963 | record_buffer (buf); |
| 964 | Fselect_window (Fdisplay_buffer (buf, other)); |
| 965 | return buf; |
| 966 | } |
| 967 | |
| 968 | DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0, |
| 969 | "Return the current buffer as a Lisp object.") |
| 970 | () |
| 971 | { |
| 972 | register Lisp_Object buf; |
| 973 | XSETBUFFER (buf, current_buffer); |
| 974 | return buf; |
| 975 | } |
| 976 | \f |
| 977 | /* Set the current buffer to b */ |
| 978 | |
| 979 | void |
| 980 | set_buffer_internal (b) |
| 981 | register struct buffer *b; |
| 982 | { |
| 983 | register struct buffer *old_buf; |
| 984 | register Lisp_Object tail, valcontents; |
| 985 | Lisp_Object tem; |
| 986 | |
| 987 | if (current_buffer == b) |
| 988 | return; |
| 989 | |
| 990 | windows_or_buffers_changed = 1; |
| 991 | old_buf = current_buffer; |
| 992 | current_buffer = b; |
| 993 | last_known_column_point = -1; /* invalidate indentation cache */ |
| 994 | |
| 995 | /* Look down buffer's list of local Lisp variables |
| 996 | to find and update any that forward into C variables. */ |
| 997 | |
| 998 | for (tail = b->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr) |
| 999 | { |
| 1000 | valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; |
| 1001 | if ((BUFFER_LOCAL_VALUEP (valcontents) |
| 1002 | || SOME_BUFFER_LOCAL_VALUEP (valcontents)) |
| 1003 | && (tem = XBUFFER_LOCAL_VALUE (valcontents)->car, |
| 1004 | (BOOLFWDP (tem) || INTFWDP (tem) || OBJFWDP (tem)))) |
| 1005 | /* Just reference the variable |
| 1006 | to cause it to become set for this buffer. */ |
| 1007 | Fsymbol_value (XCONS (XCONS (tail)->car)->car); |
| 1008 | } |
| 1009 | |
| 1010 | /* Do the same with any others that were local to the previous buffer */ |
| 1011 | |
| 1012 | if (old_buf) |
| 1013 | for (tail = old_buf->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr) |
| 1014 | { |
| 1015 | valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; |
| 1016 | if ((BUFFER_LOCAL_VALUEP (valcontents) |
| 1017 | || SOME_BUFFER_LOCAL_VALUEP (valcontents)) |
| 1018 | && (tem = XBUFFER_LOCAL_VALUE (valcontents)->car, |
| 1019 | (BOOLFWDP (tem) || INTFWDP (tem) || OBJFWDP (tem)))) |
| 1020 | /* Just reference the variable |
| 1021 | to cause it to become set for this buffer. */ |
| 1022 | Fsymbol_value (XCONS (XCONS (tail)->car)->car); |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0, |
| 1027 | "Make the buffer BUFFER current for editing operations.\n\ |
| 1028 | BUFFER may be a buffer or the name of an existing buffer.\n\ |
| 1029 | See also `save-excursion' when you want to make a buffer current temporarily.\n\ |
| 1030 | This function does not display the buffer, so its effect ends\n\ |
| 1031 | when the current command terminates.\n\ |
| 1032 | Use `switch-to-buffer' or `pop-to-buffer' to switch buffers permanently.") |
| 1033 | (bufname) |
| 1034 | register Lisp_Object bufname; |
| 1035 | { |
| 1036 | register Lisp_Object buffer; |
| 1037 | buffer = Fget_buffer (bufname); |
| 1038 | if (NILP (buffer)) |
| 1039 | nsberror (bufname); |
| 1040 | if (NILP (XBUFFER (buffer)->name)) |
| 1041 | error ("Selecting deleted buffer"); |
| 1042 | set_buffer_internal (XBUFFER (buffer)); |
| 1043 | return buffer; |
| 1044 | } |
| 1045 | \f |
| 1046 | DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only, |
| 1047 | Sbarf_if_buffer_read_only, 0, 0, 0, |
| 1048 | "Signal a `buffer-read-only' error if the current buffer is read-only.") |
| 1049 | () |
| 1050 | { |
| 1051 | if (!NILP (current_buffer->read_only) |
| 1052 | && NILP (Vinhibit_read_only)) |
| 1053 | Fsignal (Qbuffer_read_only, (Fcons (Fcurrent_buffer (), Qnil))); |
| 1054 | return Qnil; |
| 1055 | } |
| 1056 | |
| 1057 | DEFUN ("bury-buffer", Fbury_buffer, Sbury_buffer, 0, 1, "", |
| 1058 | "Put BUFFER at the end of the list of all buffers.\n\ |
| 1059 | There it is the least likely candidate for `other-buffer' to return;\n\ |
| 1060 | thus, the least likely buffer for \\[switch-to-buffer] to select by default.\n\ |
| 1061 | If BUFFER is nil or omitted, bury the current buffer.\n\ |
| 1062 | Also, if BUFFER is nil or omitted, remove the current buffer from the\n\ |
| 1063 | selected window if it is displayed there.") |
| 1064 | (buf) |
| 1065 | register Lisp_Object buf; |
| 1066 | { |
| 1067 | /* Figure out what buffer we're going to bury. */ |
| 1068 | if (NILP (buf)) |
| 1069 | { |
| 1070 | XSETBUFFER (buf, current_buffer); |
| 1071 | |
| 1072 | /* If we're burying the current buffer, unshow it. */ |
| 1073 | Fswitch_to_buffer (Fother_buffer (buf, Qnil), Qnil); |
| 1074 | } |
| 1075 | else |
| 1076 | { |
| 1077 | Lisp_Object buf1; |
| 1078 | |
| 1079 | buf1 = Fget_buffer (buf); |
| 1080 | if (NILP (buf1)) |
| 1081 | nsberror (buf); |
| 1082 | buf = buf1; |
| 1083 | } |
| 1084 | |
| 1085 | /* Move buf to the end of the buffer list. */ |
| 1086 | { |
| 1087 | register Lisp_Object aelt, link; |
| 1088 | |
| 1089 | aelt = Frassq (buf, Vbuffer_alist); |
| 1090 | link = Fmemq (aelt, Vbuffer_alist); |
| 1091 | Vbuffer_alist = Fdelq (aelt, Vbuffer_alist); |
| 1092 | XCONS (link)->cdr = Qnil; |
| 1093 | Vbuffer_alist = nconc2 (Vbuffer_alist, link); |
| 1094 | } |
| 1095 | |
| 1096 | return Qnil; |
| 1097 | } |
| 1098 | \f |
| 1099 | DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, "*", |
| 1100 | "Delete the entire contents of the current buffer.\n\ |
| 1101 | Any narrowing restriction in effect (see `narrow-to-region') is removed,\n\ |
| 1102 | so the buffer is truly empty after this.") |
| 1103 | () |
| 1104 | { |
| 1105 | Fwiden (); |
| 1106 | del_range (BEG, Z); |
| 1107 | current_buffer->last_window_start = 1; |
| 1108 | /* Prevent warnings, or suspension of auto saving, that would happen |
| 1109 | if future size is less than past size. Use of erase-buffer |
| 1110 | implies that the future text is not really related to the past text. */ |
| 1111 | XSETFASTINT (current_buffer->save_length, 0); |
| 1112 | return Qnil; |
| 1113 | } |
| 1114 | |
| 1115 | validate_region (b, e) |
| 1116 | register Lisp_Object *b, *e; |
| 1117 | { |
| 1118 | CHECK_NUMBER_COERCE_MARKER (*b, 0); |
| 1119 | CHECK_NUMBER_COERCE_MARKER (*e, 1); |
| 1120 | |
| 1121 | if (XINT (*b) > XINT (*e)) |
| 1122 | { |
| 1123 | Lisp_Object tem; |
| 1124 | tem = *b; *b = *e; *e = tem; |
| 1125 | } |
| 1126 | |
| 1127 | if (!(BEGV <= XINT (*b) && XINT (*b) <= XINT (*e) |
| 1128 | && XINT (*e) <= ZV)) |
| 1129 | args_out_of_range (*b, *e); |
| 1130 | } |
| 1131 | \f |
| 1132 | static Lisp_Object |
| 1133 | list_buffers_1 (files) |
| 1134 | Lisp_Object files; |
| 1135 | { |
| 1136 | register Lisp_Object tail, tem, buf; |
| 1137 | Lisp_Object col1, col2, col3, minspace; |
| 1138 | register struct buffer *old = current_buffer, *b; |
| 1139 | Lisp_Object desired_point; |
| 1140 | Lisp_Object other_file_symbol; |
| 1141 | |
| 1142 | desired_point = Qnil; |
| 1143 | other_file_symbol = intern ("list-buffers-directory"); |
| 1144 | |
| 1145 | XSETFASTINT (col1, 19); |
| 1146 | XSETFASTINT (col2, 26); |
| 1147 | XSETFASTINT (col3, 40); |
| 1148 | XSETFASTINT (minspace, 1); |
| 1149 | |
| 1150 | Fset_buffer (Vstandard_output); |
| 1151 | Fbuffer_disable_undo (Vstandard_output); |
| 1152 | current_buffer->read_only = Qnil; |
| 1153 | |
| 1154 | write_string ("\ |
| 1155 | MR Buffer Size Mode File\n\ |
| 1156 | -- ------ ---- ---- ----\n", -1); |
| 1157 | |
| 1158 | for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail)) |
| 1159 | { |
| 1160 | buf = Fcdr (Fcar (tail)); |
| 1161 | b = XBUFFER (buf); |
| 1162 | /* Don't mention the minibuffers. */ |
| 1163 | if (XSTRING (b->name)->data[0] == ' ') |
| 1164 | continue; |
| 1165 | /* Optionally don't mention buffers that lack files. */ |
| 1166 | if (!NILP (files) && NILP (b->filename)) |
| 1167 | continue; |
| 1168 | /* Identify the current buffer. */ |
| 1169 | if (b == old) |
| 1170 | XSETFASTINT (desired_point, PT); |
| 1171 | write_string (b == old ? "." : " ", -1); |
| 1172 | /* Identify modified buffers */ |
| 1173 | write_string (BUF_MODIFF (b) > b->save_modified ? "*" : " ", -1); |
| 1174 | /* The current buffer is special-cased to be marked read-only. |
| 1175 | It is actually made read-only by the call to |
| 1176 | Buffer-menu-mode, below. */ |
| 1177 | write_string ((b != current_buffer && NILP (b->read_only)) |
| 1178 | ? " " : "% ", -1); |
| 1179 | Fprinc (b->name, Qnil); |
| 1180 | Findent_to (col1, make_number (2)); |
| 1181 | XSETFASTINT (tem, BUF_Z (b) - BUF_BEG (b)); |
| 1182 | Fprin1 (tem, Qnil); |
| 1183 | Findent_to (col2, minspace); |
| 1184 | Fprinc (b->mode_name, Qnil); |
| 1185 | Findent_to (col3, minspace); |
| 1186 | |
| 1187 | if (!NILP (b->filename)) |
| 1188 | Fprinc (b->filename, Qnil); |
| 1189 | else |
| 1190 | { |
| 1191 | /* No visited file; check local value of list-buffers-directory. */ |
| 1192 | Lisp_Object tem; |
| 1193 | set_buffer_internal (b); |
| 1194 | tem = Fboundp (other_file_symbol); |
| 1195 | if (!NILP (tem)) |
| 1196 | { |
| 1197 | tem = Fsymbol_value (other_file_symbol); |
| 1198 | Fset_buffer (Vstandard_output); |
| 1199 | if (STRINGP (tem)) |
| 1200 | Fprinc (tem, Qnil); |
| 1201 | } |
| 1202 | else |
| 1203 | Fset_buffer (Vstandard_output); |
| 1204 | } |
| 1205 | write_string ("\n", -1); |
| 1206 | } |
| 1207 | |
| 1208 | tail = intern ("Buffer-menu-mode"); |
| 1209 | if ((tem = Ffboundp (tail), !NILP (tem))) |
| 1210 | call0 (tail); |
| 1211 | set_buffer_internal (old); |
| 1212 | return desired_point; |
| 1213 | } |
| 1214 | |
| 1215 | DEFUN ("list-buffers", Flist_buffers, Slist_buffers, 0, 1, "P", |
| 1216 | "Display a list of names of existing buffers.\n\ |
| 1217 | The list is displayed in a buffer named `*Buffer List*'.\n\ |
| 1218 | Note that buffers with names starting with spaces are omitted.\n\ |
| 1219 | Non-null optional arg FILES-ONLY means mention only file buffers.\n\ |
| 1220 | \n\ |
| 1221 | The M column contains a * for buffers that are modified.\n\ |
| 1222 | The R column contains a % for buffers that are read-only.") |
| 1223 | (files) |
| 1224 | Lisp_Object files; |
| 1225 | { |
| 1226 | Lisp_Object desired_point; |
| 1227 | |
| 1228 | desired_point |
| 1229 | = internal_with_output_to_temp_buffer ("*Buffer List*", |
| 1230 | list_buffers_1, files); |
| 1231 | |
| 1232 | if (NUMBERP (desired_point)) |
| 1233 | { |
| 1234 | int count = specpdl_ptr - specpdl; |
| 1235 | record_unwind_protect (Fset_buffer, Fcurrent_buffer ()); |
| 1236 | Fset_buffer (build_string ("*Buffer List*")); |
| 1237 | SET_PT (XINT (desired_point)); |
| 1238 | return unbind_to (count, Qnil); |
| 1239 | } |
| 1240 | return Qnil; |
| 1241 | } |
| 1242 | |
| 1243 | DEFUN ("kill-all-local-variables", Fkill_all_local_variables, Skill_all_local_variables, |
| 1244 | 0, 0, 0, |
| 1245 | "Switch to Fundamental mode by killing current buffer's local variables.\n\ |
| 1246 | Most local variable bindings are eliminated so that the default values\n\ |
| 1247 | become effective once more. Also, the syntax table is set from\n\ |
| 1248 | `standard-syntax-table', the local keymap is set to nil,\n\ |
| 1249 | and the abbrev table from `fundamental-mode-abbrev-table'.\n\ |
| 1250 | This function also forces redisplay of the mode line.\n\ |
| 1251 | \n\ |
| 1252 | Every function to select a new major mode starts by\n\ |
| 1253 | calling this function.\n\n\ |
| 1254 | As a special exception, local variables whose names have\n\ |
| 1255 | a non-nil `permanent-local' property are not eliminated by this function.\n\ |
| 1256 | \n\ |
| 1257 | The first thing this function does is run\n\ |
| 1258 | the normal hook `change-major-mode-hook'.") |
| 1259 | () |
| 1260 | { |
| 1261 | register Lisp_Object alist, sym, tem; |
| 1262 | Lisp_Object oalist; |
| 1263 | |
| 1264 | if (!NILP (Vrun_hooks)) |
| 1265 | call1 (Vrun_hooks, intern ("change-major-mode-hook")); |
| 1266 | oalist = current_buffer->local_var_alist; |
| 1267 | |
| 1268 | /* Make sure no local variables remain set up with this buffer |
| 1269 | for their current values. */ |
| 1270 | |
| 1271 | for (alist = oalist; !NILP (alist); alist = XCONS (alist)->cdr) |
| 1272 | { |
| 1273 | sym = XCONS (XCONS (alist)->car)->car; |
| 1274 | |
| 1275 | /* Need not do anything if some other buffer's binding is now encached. */ |
| 1276 | tem = XCONS (XBUFFER_LOCAL_VALUE (XSYMBOL (sym)->value)->cdr)->car; |
| 1277 | if (XBUFFER (tem) == current_buffer) |
| 1278 | { |
| 1279 | /* Symbol is set up for this buffer's old local value. |
| 1280 | Set it up for the current buffer with the default value. */ |
| 1281 | |
| 1282 | tem = XCONS (XBUFFER_LOCAL_VALUE (XSYMBOL (sym)->value)->cdr)->cdr; |
| 1283 | /* Store the symbol's current value into the alist entry |
| 1284 | it is currently set up for. This is so that, if the |
| 1285 | local is marked permanent, and we make it local again below, |
| 1286 | we don't lose the value. */ |
| 1287 | XCONS (XCONS (tem)->car)->cdr |
| 1288 | = do_symval_forwarding (XBUFFER_LOCAL_VALUE (XSYMBOL (sym)->value)->car); |
| 1289 | /* Switch to the symbol's default-value alist entry. */ |
| 1290 | XCONS (tem)->car = tem; |
| 1291 | /* Mark it as current for the current buffer. */ |
| 1292 | XCONS (XBUFFER_LOCAL_VALUE (XSYMBOL (sym)->value)->cdr)->car |
| 1293 | = Fcurrent_buffer (); |
| 1294 | /* Store the current value into any forwarding in the symbol. */ |
| 1295 | store_symval_forwarding (sym, XBUFFER_LOCAL_VALUE (XSYMBOL (sym)->value)->car, |
| 1296 | XCONS (tem)->cdr); |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | /* Actually eliminate all local bindings of this buffer. */ |
| 1301 | |
| 1302 | reset_buffer_local_variables (current_buffer); |
| 1303 | |
| 1304 | /* Redisplay mode lines; we are changing major mode. */ |
| 1305 | |
| 1306 | update_mode_lines++; |
| 1307 | |
| 1308 | /* Any which are supposed to be permanent, |
| 1309 | make local again, with the same values they had. */ |
| 1310 | |
| 1311 | for (alist = oalist; !NILP (alist); alist = XCONS (alist)->cdr) |
| 1312 | { |
| 1313 | sym = XCONS (XCONS (alist)->car)->car; |
| 1314 | tem = Fget (sym, Qpermanent_local); |
| 1315 | if (! NILP (tem)) |
| 1316 | { |
| 1317 | Fmake_local_variable (sym); |
| 1318 | Fset (sym, XCONS (XCONS (alist)->car)->cdr); |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | /* Force mode-line redisplay. Useful here because all major mode |
| 1323 | commands call this function. */ |
| 1324 | update_mode_lines++; |
| 1325 | |
| 1326 | return Qnil; |
| 1327 | } |
| 1328 | \f |
| 1329 | /* Find all the overlays in the current buffer that contain position POS. |
| 1330 | Return the number found, and store them in a vector in *VEC_PTR. |
| 1331 | Store in *LEN_PTR the size allocated for the vector. |
| 1332 | Store in *NEXT_PTR the next position after POS where an overlay starts, |
| 1333 | or ZV if there are no more overlays. |
| 1334 | Store in *PREV_PTR the previous position after POS where an overlay ends, |
| 1335 | or BEGV if there are no previous overlays. |
| 1336 | NEXT_PTR and/or PREV_PTR may be 0, meaning don't store that info. |
| 1337 | |
| 1338 | *VEC_PTR and *LEN_PTR should contain a valid vector and size |
| 1339 | when this function is called. |
| 1340 | |
| 1341 | If EXTEND is non-zero, we make the vector bigger if necessary. |
| 1342 | If EXTEND is zero, we never extend the vector, |
| 1343 | and we store only as many overlays as will fit. |
| 1344 | But we still return the total number of overlays. */ |
| 1345 | |
| 1346 | int |
| 1347 | overlays_at (pos, extend, vec_ptr, len_ptr, next_ptr, prev_ptr) |
| 1348 | int pos; |
| 1349 | int extend; |
| 1350 | Lisp_Object **vec_ptr; |
| 1351 | int *len_ptr; |
| 1352 | int *next_ptr; |
| 1353 | int *prev_ptr; |
| 1354 | { |
| 1355 | Lisp_Object tail, overlay, start, end, result; |
| 1356 | int idx = 0; |
| 1357 | int len = *len_ptr; |
| 1358 | Lisp_Object *vec = *vec_ptr; |
| 1359 | int next = ZV; |
| 1360 | int prev = BEGV; |
| 1361 | int inhibit_storing = 0; |
| 1362 | |
| 1363 | for (tail = current_buffer->overlays_before; |
| 1364 | XGCTYPE (tail) == Lisp_Cons; |
| 1365 | tail = XCONS (tail)->cdr) |
| 1366 | { |
| 1367 | int startpos, endpos; |
| 1368 | |
| 1369 | overlay = XCONS (tail)->car; |
| 1370 | |
| 1371 | start = OVERLAY_START (overlay); |
| 1372 | end = OVERLAY_END (overlay); |
| 1373 | endpos = OVERLAY_POSITION (end); |
| 1374 | if (endpos < pos) |
| 1375 | { |
| 1376 | if (prev < endpos) |
| 1377 | prev = endpos; |
| 1378 | break; |
| 1379 | } |
| 1380 | if (endpos == pos) |
| 1381 | continue; |
| 1382 | startpos = OVERLAY_POSITION (start); |
| 1383 | if (startpos <= pos) |
| 1384 | { |
| 1385 | if (idx == len) |
| 1386 | { |
| 1387 | /* The supplied vector is full. |
| 1388 | Either make it bigger, or don't store any more in it. */ |
| 1389 | if (extend) |
| 1390 | { |
| 1391 | *len_ptr = len *= 2; |
| 1392 | vec = (Lisp_Object *) xrealloc (vec, len * sizeof (Lisp_Object)); |
| 1393 | *vec_ptr = vec; |
| 1394 | } |
| 1395 | else |
| 1396 | inhibit_storing = 1; |
| 1397 | } |
| 1398 | |
| 1399 | if (!inhibit_storing) |
| 1400 | vec[idx] = overlay; |
| 1401 | /* Keep counting overlays even if we can't return them all. */ |
| 1402 | idx++; |
| 1403 | } |
| 1404 | else if (startpos < next) |
| 1405 | next = startpos; |
| 1406 | } |
| 1407 | |
| 1408 | for (tail = current_buffer->overlays_after; |
| 1409 | XGCTYPE (tail) == Lisp_Cons; |
| 1410 | tail = XCONS (tail)->cdr) |
| 1411 | { |
| 1412 | int startpos, endpos; |
| 1413 | |
| 1414 | overlay = XCONS (tail)->car; |
| 1415 | |
| 1416 | start = OVERLAY_START (overlay); |
| 1417 | end = OVERLAY_END (overlay); |
| 1418 | startpos = OVERLAY_POSITION (start); |
| 1419 | if (pos < startpos) |
| 1420 | { |
| 1421 | if (startpos < next) |
| 1422 | next = startpos; |
| 1423 | break; |
| 1424 | } |
| 1425 | endpos = OVERLAY_POSITION (end); |
| 1426 | if (pos < endpos) |
| 1427 | { |
| 1428 | if (idx == len) |
| 1429 | { |
| 1430 | if (extend) |
| 1431 | { |
| 1432 | *len_ptr = len *= 2; |
| 1433 | vec = (Lisp_Object *) xrealloc (vec, len * sizeof (Lisp_Object)); |
| 1434 | *vec_ptr = vec; |
| 1435 | } |
| 1436 | else |
| 1437 | inhibit_storing = 1; |
| 1438 | } |
| 1439 | |
| 1440 | if (!inhibit_storing) |
| 1441 | vec[idx] = overlay; |
| 1442 | idx++; |
| 1443 | } |
| 1444 | else if (endpos < pos && endpos > prev) |
| 1445 | prev = endpos; |
| 1446 | } |
| 1447 | |
| 1448 | if (next_ptr) |
| 1449 | *next_ptr = next; |
| 1450 | if (prev_ptr) |
| 1451 | *prev_ptr = prev; |
| 1452 | return idx; |
| 1453 | } |
| 1454 | \f |
| 1455 | struct sortvec |
| 1456 | { |
| 1457 | Lisp_Object overlay; |
| 1458 | int beg, end; |
| 1459 | int priority; |
| 1460 | }; |
| 1461 | |
| 1462 | static int |
| 1463 | compare_overlays (s1, s2) |
| 1464 | struct sortvec *s1, *s2; |
| 1465 | { |
| 1466 | if (s1->priority != s2->priority) |
| 1467 | return s1->priority - s2->priority; |
| 1468 | if (s1->beg != s2->beg) |
| 1469 | return s1->beg - s2->beg; |
| 1470 | if (s1->end != s2->end) |
| 1471 | return s2->end - s1->end; |
| 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | /* Sort an array of overlays by priority. The array is modified in place. |
| 1476 | The return value is the new size; this may be smaller than the original |
| 1477 | size if some of the overlays were invalid or were window-specific. */ |
| 1478 | int |
| 1479 | sort_overlays (overlay_vec, noverlays, w) |
| 1480 | Lisp_Object *overlay_vec; |
| 1481 | int noverlays; |
| 1482 | struct window *w; |
| 1483 | { |
| 1484 | int i, j; |
| 1485 | struct sortvec *sortvec; |
| 1486 | sortvec = (struct sortvec *) alloca (noverlays * sizeof (struct sortvec)); |
| 1487 | |
| 1488 | /* Put the valid and relevant overlays into sortvec. */ |
| 1489 | |
| 1490 | for (i = 0, j = 0; i < noverlays; i++) |
| 1491 | { |
| 1492 | Lisp_Object tem; |
| 1493 | Lisp_Object overlay; |
| 1494 | |
| 1495 | overlay = overlay_vec[i]; |
| 1496 | if (OVERLAY_VALID (overlay) |
| 1497 | && OVERLAY_POSITION (OVERLAY_START (overlay)) > 0 |
| 1498 | && OVERLAY_POSITION (OVERLAY_END (overlay)) > 0) |
| 1499 | { |
| 1500 | /* If we're interested in a specific window, then ignore |
| 1501 | overlays that are limited to some other window. */ |
| 1502 | if (w) |
| 1503 | { |
| 1504 | Lisp_Object window; |
| 1505 | |
| 1506 | window = Foverlay_get (overlay, Qwindow); |
| 1507 | if (WINDOWP (window) && XWINDOW (window) != w) |
| 1508 | continue; |
| 1509 | } |
| 1510 | |
| 1511 | /* This overlay is good and counts: put it into sortvec. */ |
| 1512 | sortvec[j].overlay = overlay; |
| 1513 | sortvec[j].beg = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 1514 | sortvec[j].end = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 1515 | tem = Foverlay_get (overlay, Qpriority); |
| 1516 | if (INTEGERP (tem)) |
| 1517 | sortvec[j].priority = XINT (tem); |
| 1518 | else |
| 1519 | sortvec[j].priority = 0; |
| 1520 | j++; |
| 1521 | } |
| 1522 | } |
| 1523 | noverlays = j; |
| 1524 | |
| 1525 | /* Sort the overlays into the proper order: increasing priority. */ |
| 1526 | |
| 1527 | if (noverlays > 1) |
| 1528 | qsort (sortvec, noverlays, sizeof (struct sortvec), compare_overlays); |
| 1529 | |
| 1530 | for (i = 0; i < noverlays; i++) |
| 1531 | overlay_vec[i] = sortvec[i].overlay; |
| 1532 | return (noverlays); |
| 1533 | } |
| 1534 | \f |
| 1535 | /* Shift overlays in BUF's overlay lists, to center the lists at POS. */ |
| 1536 | |
| 1537 | void |
| 1538 | recenter_overlay_lists (buf, pos) |
| 1539 | struct buffer *buf; |
| 1540 | int pos; |
| 1541 | { |
| 1542 | Lisp_Object overlay, tail, next, prev, beg, end; |
| 1543 | |
| 1544 | /* See if anything in overlays_before should move to overlays_after. */ |
| 1545 | |
| 1546 | /* We don't strictly need prev in this loop; it should always be nil. |
| 1547 | But we use it for symmetry and in case that should cease to be true |
| 1548 | with some future change. */ |
| 1549 | prev = Qnil; |
| 1550 | for (tail = buf->overlays_before; |
| 1551 | CONSP (tail); |
| 1552 | prev = tail, tail = next) |
| 1553 | { |
| 1554 | next = XCONS (tail)->cdr; |
| 1555 | overlay = XCONS (tail)->car; |
| 1556 | |
| 1557 | /* If the overlay is not valid, get rid of it. */ |
| 1558 | if (!OVERLAY_VALID (overlay)) |
| 1559 | #if 1 |
| 1560 | abort (); |
| 1561 | #else |
| 1562 | { |
| 1563 | /* Splice the cons cell TAIL out of overlays_before. */ |
| 1564 | if (!NILP (prev)) |
| 1565 | XCONS (prev)->cdr = next; |
| 1566 | else |
| 1567 | buf->overlays_before = next; |
| 1568 | tail = prev; |
| 1569 | continue; |
| 1570 | } |
| 1571 | #endif |
| 1572 | |
| 1573 | beg = OVERLAY_START (overlay); |
| 1574 | end = OVERLAY_END (overlay); |
| 1575 | |
| 1576 | if (OVERLAY_POSITION (end) > pos) |
| 1577 | { |
| 1578 | /* OVERLAY needs to be moved. */ |
| 1579 | int where = OVERLAY_POSITION (beg); |
| 1580 | Lisp_Object other, other_prev; |
| 1581 | |
| 1582 | /* Splice the cons cell TAIL out of overlays_before. */ |
| 1583 | if (!NILP (prev)) |
| 1584 | XCONS (prev)->cdr = next; |
| 1585 | else |
| 1586 | buf->overlays_before = next; |
| 1587 | |
| 1588 | /* Search thru overlays_after for where to put it. */ |
| 1589 | other_prev = Qnil; |
| 1590 | for (other = buf->overlays_after; |
| 1591 | CONSP (other); |
| 1592 | other_prev = other, other = XCONS (other)->cdr) |
| 1593 | { |
| 1594 | Lisp_Object otherbeg, otheroverlay, follower; |
| 1595 | int win; |
| 1596 | |
| 1597 | otheroverlay = XCONS (other)->car; |
| 1598 | if (! OVERLAY_VALID (otheroverlay)) |
| 1599 | abort (); |
| 1600 | |
| 1601 | otherbeg = OVERLAY_START (otheroverlay); |
| 1602 | if (OVERLAY_POSITION (otherbeg) >= where) |
| 1603 | break; |
| 1604 | } |
| 1605 | |
| 1606 | /* Add TAIL to overlays_after before OTHER. */ |
| 1607 | XCONS (tail)->cdr = other; |
| 1608 | if (!NILP (other_prev)) |
| 1609 | XCONS (other_prev)->cdr = tail; |
| 1610 | else |
| 1611 | buf->overlays_after = tail; |
| 1612 | tail = prev; |
| 1613 | } |
| 1614 | else |
| 1615 | /* We've reached the things that should stay in overlays_before. |
| 1616 | All the rest of overlays_before must end even earlier, |
| 1617 | so stop now. */ |
| 1618 | break; |
| 1619 | } |
| 1620 | |
| 1621 | /* See if anything in overlays_after should be in overlays_before. */ |
| 1622 | prev = Qnil; |
| 1623 | for (tail = buf->overlays_after; |
| 1624 | CONSP (tail); |
| 1625 | prev = tail, tail = next) |
| 1626 | { |
| 1627 | next = XCONS (tail)->cdr; |
| 1628 | overlay = XCONS (tail)->car; |
| 1629 | |
| 1630 | /* If the overlay is not valid, get rid of it. */ |
| 1631 | if (!OVERLAY_VALID (overlay)) |
| 1632 | #if 1 |
| 1633 | abort (); |
| 1634 | #else |
| 1635 | { |
| 1636 | /* Splice the cons cell TAIL out of overlays_after. */ |
| 1637 | if (!NILP (prev)) |
| 1638 | XCONS (prev)->cdr = next; |
| 1639 | else |
| 1640 | buf->overlays_after = next; |
| 1641 | tail = prev; |
| 1642 | continue; |
| 1643 | } |
| 1644 | #endif |
| 1645 | |
| 1646 | beg = OVERLAY_START (overlay); |
| 1647 | end = OVERLAY_END (overlay); |
| 1648 | |
| 1649 | /* Stop looking, when we know that nothing further |
| 1650 | can possibly end before POS. */ |
| 1651 | if (OVERLAY_POSITION (beg) > pos) |
| 1652 | break; |
| 1653 | |
| 1654 | if (OVERLAY_POSITION (end) <= pos) |
| 1655 | { |
| 1656 | /* OVERLAY needs to be moved. */ |
| 1657 | int where = OVERLAY_POSITION (end); |
| 1658 | Lisp_Object other, other_prev; |
| 1659 | |
| 1660 | /* Splice the cons cell TAIL out of overlays_after. */ |
| 1661 | if (!NILP (prev)) |
| 1662 | XCONS (prev)->cdr = next; |
| 1663 | else |
| 1664 | buf->overlays_after = next; |
| 1665 | |
| 1666 | /* Search thru overlays_before for where to put it. */ |
| 1667 | other_prev = Qnil; |
| 1668 | for (other = buf->overlays_before; |
| 1669 | CONSP (other); |
| 1670 | other_prev = other, other = XCONS (other)->cdr) |
| 1671 | { |
| 1672 | Lisp_Object otherend, otheroverlay; |
| 1673 | int win; |
| 1674 | |
| 1675 | otheroverlay = XCONS (other)->car; |
| 1676 | if (! OVERLAY_VALID (otheroverlay)) |
| 1677 | abort (); |
| 1678 | |
| 1679 | otherend = OVERLAY_END (otheroverlay); |
| 1680 | if (OVERLAY_POSITION (otherend) <= where) |
| 1681 | break; |
| 1682 | } |
| 1683 | |
| 1684 | /* Add TAIL to overlays_before before OTHER. */ |
| 1685 | XCONS (tail)->cdr = other; |
| 1686 | if (!NILP (other_prev)) |
| 1687 | XCONS (other_prev)->cdr = tail; |
| 1688 | else |
| 1689 | buf->overlays_before = tail; |
| 1690 | tail = prev; |
| 1691 | } |
| 1692 | } |
| 1693 | |
| 1694 | XSETFASTINT (buf->overlay_center, pos); |
| 1695 | } |
| 1696 | |
| 1697 | /* Fix up overlays that were garbled as a result of permuting markers |
| 1698 | in the range START through END. Any overlay with at least one |
| 1699 | endpoint in this range will need to be unlinked from the overlay |
| 1700 | list and reinserted in its proper place. |
| 1701 | Such an overlay might even have negative size at this point. |
| 1702 | If so, we'll reverse the endpoints. Can you think of anything |
| 1703 | better to do in this situation? */ |
| 1704 | void |
| 1705 | fix_overlays_in_range (start, end) |
| 1706 | register int start, end; |
| 1707 | { |
| 1708 | Lisp_Object tem, overlay; |
| 1709 | Lisp_Object before_list, after_list; |
| 1710 | Lisp_Object *ptail, *pbefore = &before_list, *pafter = &after_list; |
| 1711 | int startpos, endpos; |
| 1712 | |
| 1713 | /* This algorithm shifts links around instead of consing and GCing. |
| 1714 | The loop invariant is that before_list (resp. after_list) is a |
| 1715 | well-formed list except that its last element, the one that |
| 1716 | *pbefore (resp. *pafter) points to, is still uninitialized. |
| 1717 | So it's not a bug that before_list isn't initialized, although |
| 1718 | it may look strange. */ |
| 1719 | for (ptail = ¤t_buffer->overlays_before; CONSP (*ptail);) |
| 1720 | { |
| 1721 | overlay = XCONS (*ptail)->car; |
| 1722 | endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 1723 | if (endpos < start) |
| 1724 | break; |
| 1725 | startpos = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 1726 | if (endpos < end |
| 1727 | || (startpos >= start && startpos < end)) |
| 1728 | { |
| 1729 | /* If the overlay is backwards, fix that now. */ |
| 1730 | if (startpos > endpos) |
| 1731 | { |
| 1732 | int tem; |
| 1733 | Fset_marker (OVERLAY_START (overlay), endpos, Qnil); |
| 1734 | Fset_marker (OVERLAY_END (overlay), startpos, Qnil); |
| 1735 | tem = startpos; startpos = endpos; endpos = tem; |
| 1736 | } |
| 1737 | /* Add it to the end of the wrong list. Later on, |
| 1738 | recenter_overlay_lists will move it to the right place. */ |
| 1739 | if (endpos < XINT (current_buffer->overlay_center)) |
| 1740 | { |
| 1741 | *pafter = *ptail; |
| 1742 | pafter = &XCONS (*ptail)->cdr; |
| 1743 | } |
| 1744 | else |
| 1745 | { |
| 1746 | *pbefore = *ptail; |
| 1747 | pbefore = &XCONS (*ptail)->cdr; |
| 1748 | } |
| 1749 | *ptail = XCONS (*ptail)->cdr; |
| 1750 | } |
| 1751 | else |
| 1752 | ptail = &XCONS (*ptail)->cdr; |
| 1753 | } |
| 1754 | for (ptail = ¤t_buffer->overlays_after; CONSP (*ptail);) |
| 1755 | { |
| 1756 | overlay = XCONS (*ptail)->car; |
| 1757 | startpos = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 1758 | if (startpos >= end) |
| 1759 | break; |
| 1760 | endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 1761 | if (startpos >= start |
| 1762 | || (endpos >= start && endpos < end)) |
| 1763 | { |
| 1764 | if (startpos > endpos) |
| 1765 | { |
| 1766 | int tem; |
| 1767 | Fset_marker (OVERLAY_START (overlay), endpos, Qnil); |
| 1768 | Fset_marker (OVERLAY_END (overlay), startpos, Qnil); |
| 1769 | tem = startpos; startpos = endpos; endpos = tem; |
| 1770 | } |
| 1771 | if (endpos < XINT (current_buffer->overlay_center)) |
| 1772 | { |
| 1773 | *pafter = *ptail; |
| 1774 | pafter = &XCONS (*ptail)->cdr; |
| 1775 | } |
| 1776 | else |
| 1777 | { |
| 1778 | *pbefore = *ptail; |
| 1779 | pbefore = &XCONS (*ptail)->cdr; |
| 1780 | } |
| 1781 | *ptail = XCONS (*ptail)->cdr; |
| 1782 | } |
| 1783 | else |
| 1784 | ptail = &XCONS (*ptail)->cdr; |
| 1785 | } |
| 1786 | |
| 1787 | /* Splice the constructed (wrong) lists into the buffer's lists, |
| 1788 | and let the recenter function make it sane again. */ |
| 1789 | *pbefore = current_buffer->overlays_before; |
| 1790 | current_buffer->overlays_before = before_list; |
| 1791 | recenter_overlay_lists (current_buffer, |
| 1792 | XINT (current_buffer->overlay_center)); |
| 1793 | |
| 1794 | *pafter = current_buffer->overlays_after; |
| 1795 | current_buffer->overlays_after = after_list; |
| 1796 | recenter_overlay_lists (current_buffer, |
| 1797 | XINT (current_buffer->overlay_center)); |
| 1798 | } |
| 1799 | \f |
| 1800 | DEFUN ("overlayp", Foverlayp, Soverlayp, 1, 1, 0, |
| 1801 | "Return t if OBJECT is an overlay.") |
| 1802 | (object) |
| 1803 | Lisp_Object object; |
| 1804 | { |
| 1805 | return (OVERLAYP (object) ? Qt : Qnil); |
| 1806 | } |
| 1807 | |
| 1808 | DEFUN ("make-overlay", Fmake_overlay, Smake_overlay, 2, 3, 0, |
| 1809 | "Create a new overlay with range BEG to END in BUFFER.\n\ |
| 1810 | If omitted, BUFFER defaults to the current buffer.\n\ |
| 1811 | BEG and END may be integers or markers.") |
| 1812 | (beg, end, buffer) |
| 1813 | Lisp_Object beg, end, buffer; |
| 1814 | { |
| 1815 | Lisp_Object overlay; |
| 1816 | struct buffer *b; |
| 1817 | |
| 1818 | if (NILP (buffer)) |
| 1819 | XSETBUFFER (buffer, current_buffer); |
| 1820 | else |
| 1821 | CHECK_BUFFER (buffer, 2); |
| 1822 | if (MARKERP (beg) |
| 1823 | && ! EQ (Fmarker_buffer (beg), buffer)) |
| 1824 | error ("Marker points into wrong buffer"); |
| 1825 | if (MARKERP (end) |
| 1826 | && ! EQ (Fmarker_buffer (end), buffer)) |
| 1827 | error ("Marker points into wrong buffer"); |
| 1828 | |
| 1829 | CHECK_NUMBER_COERCE_MARKER (beg, 1); |
| 1830 | CHECK_NUMBER_COERCE_MARKER (end, 1); |
| 1831 | |
| 1832 | if (XINT (beg) > XINT (end)) |
| 1833 | { |
| 1834 | Lisp_Object temp; |
| 1835 | temp = beg; beg = end; end = temp; |
| 1836 | } |
| 1837 | |
| 1838 | b = XBUFFER (buffer); |
| 1839 | |
| 1840 | beg = Fset_marker (Fmake_marker (), beg, buffer); |
| 1841 | end = Fset_marker (Fmake_marker (), end, buffer); |
| 1842 | |
| 1843 | overlay = allocate_misc (); |
| 1844 | XMISC (overlay)->type = Lisp_Misc_Overlay; |
| 1845 | XOVERLAY (overlay)->start = beg; |
| 1846 | XOVERLAY (overlay)->end = end; |
| 1847 | XOVERLAY (overlay)->plist = Qnil; |
| 1848 | |
| 1849 | /* Put the new overlay on the wrong list. */ |
| 1850 | end = OVERLAY_END (overlay); |
| 1851 | if (OVERLAY_POSITION (end) < XINT (b->overlay_center)) |
| 1852 | b->overlays_after = Fcons (overlay, b->overlays_after); |
| 1853 | else |
| 1854 | b->overlays_before = Fcons (overlay, b->overlays_before); |
| 1855 | |
| 1856 | /* This puts it in the right list, and in the right order. */ |
| 1857 | recenter_overlay_lists (b, XINT (b->overlay_center)); |
| 1858 | |
| 1859 | /* We don't need to redisplay the region covered by the overlay, because |
| 1860 | the overlay has no properties at the moment. */ |
| 1861 | |
| 1862 | return overlay; |
| 1863 | } |
| 1864 | |
| 1865 | DEFUN ("move-overlay", Fmove_overlay, Smove_overlay, 3, 4, 0, |
| 1866 | "Set the endpoints of OVERLAY to BEG and END in BUFFER.\n\ |
| 1867 | If BUFFER is omitted, leave OVERLAY in the same buffer it inhabits now.\n\ |
| 1868 | If BUFFER is omitted, and OVERLAY is in no buffer, put it in the current\n\ |
| 1869 | buffer.") |
| 1870 | (overlay, beg, end, buffer) |
| 1871 | Lisp_Object overlay, beg, end, buffer; |
| 1872 | { |
| 1873 | struct buffer *b, *ob; |
| 1874 | Lisp_Object obuffer; |
| 1875 | int count = specpdl_ptr - specpdl; |
| 1876 | |
| 1877 | CHECK_OVERLAY (overlay, 0); |
| 1878 | if (NILP (buffer)) |
| 1879 | buffer = Fmarker_buffer (OVERLAY_START (overlay)); |
| 1880 | if (NILP (buffer)) |
| 1881 | XSETBUFFER (buffer, current_buffer); |
| 1882 | CHECK_BUFFER (buffer, 3); |
| 1883 | |
| 1884 | if (MARKERP (beg) |
| 1885 | && ! EQ (Fmarker_buffer (beg), buffer)) |
| 1886 | error ("Marker points into wrong buffer"); |
| 1887 | if (MARKERP (end) |
| 1888 | && ! EQ (Fmarker_buffer (end), buffer)) |
| 1889 | error ("Marker points into wrong buffer"); |
| 1890 | |
| 1891 | CHECK_NUMBER_COERCE_MARKER (beg, 1); |
| 1892 | CHECK_NUMBER_COERCE_MARKER (end, 1); |
| 1893 | |
| 1894 | if (XINT (beg) == XINT (end) && ! NILP (Foverlay_get (overlay, Qevaporate))) |
| 1895 | return Fdelete_overlay (overlay); |
| 1896 | |
| 1897 | if (XINT (beg) > XINT (end)) |
| 1898 | { |
| 1899 | Lisp_Object temp; |
| 1900 | temp = beg; beg = end; end = temp; |
| 1901 | } |
| 1902 | |
| 1903 | specbind (Qinhibit_quit, Qt); |
| 1904 | |
| 1905 | obuffer = Fmarker_buffer (OVERLAY_START (overlay)); |
| 1906 | b = XBUFFER (buffer); |
| 1907 | ob = XBUFFER (obuffer); |
| 1908 | |
| 1909 | /* If the overlay has changed buffers, do a thorough redisplay. */ |
| 1910 | if (!EQ (buffer, obuffer)) |
| 1911 | { |
| 1912 | /* Redisplay where the overlay was. */ |
| 1913 | if (!NILP (obuffer)) |
| 1914 | { |
| 1915 | Lisp_Object o_beg; |
| 1916 | Lisp_Object o_end; |
| 1917 | |
| 1918 | o_beg = OVERLAY_START (overlay); |
| 1919 | o_end = OVERLAY_END (overlay); |
| 1920 | o_beg = OVERLAY_POSITION (o_beg); |
| 1921 | o_end = OVERLAY_POSITION (o_end); |
| 1922 | |
| 1923 | redisplay_region (ob, XINT (o_beg), XINT (o_end)); |
| 1924 | } |
| 1925 | |
| 1926 | /* Redisplay where the overlay is going to be. */ |
| 1927 | redisplay_region (b, XINT (beg), XINT (end)); |
| 1928 | |
| 1929 | /* Don't limit redisplay to the selected window. */ |
| 1930 | windows_or_buffers_changed = 1; |
| 1931 | } |
| 1932 | else |
| 1933 | /* Redisplay the area the overlay has just left, or just enclosed. */ |
| 1934 | { |
| 1935 | Lisp_Object o_beg; |
| 1936 | Lisp_Object o_end; |
| 1937 | int change_beg, change_end; |
| 1938 | |
| 1939 | o_beg = OVERLAY_START (overlay); |
| 1940 | o_end = OVERLAY_END (overlay); |
| 1941 | o_beg = OVERLAY_POSITION (o_beg); |
| 1942 | o_end = OVERLAY_POSITION (o_end); |
| 1943 | |
| 1944 | if (XINT (o_beg) == XINT (beg)) |
| 1945 | redisplay_region (b, XINT (o_end), XINT (end)); |
| 1946 | else if (XINT (o_end) == XINT (end)) |
| 1947 | redisplay_region (b, XINT (o_beg), XINT (beg)); |
| 1948 | else |
| 1949 | { |
| 1950 | if (XINT (beg) < XINT (o_beg)) o_beg = beg; |
| 1951 | if (XINT (end) > XINT (o_end)) o_end = end; |
| 1952 | redisplay_region (b, XINT (o_beg), XINT (o_end)); |
| 1953 | } |
| 1954 | } |
| 1955 | |
| 1956 | if (!NILP (obuffer)) |
| 1957 | { |
| 1958 | ob->overlays_before = Fdelq (overlay, ob->overlays_before); |
| 1959 | ob->overlays_after = Fdelq (overlay, ob->overlays_after); |
| 1960 | } |
| 1961 | |
| 1962 | Fset_marker (OVERLAY_START (overlay), beg, buffer); |
| 1963 | Fset_marker (OVERLAY_END (overlay), end, buffer); |
| 1964 | |
| 1965 | /* Put the overlay on the wrong list. */ |
| 1966 | end = OVERLAY_END (overlay); |
| 1967 | if (OVERLAY_POSITION (end) < XINT (b->overlay_center)) |
| 1968 | b->overlays_after = Fcons (overlay, b->overlays_after); |
| 1969 | else |
| 1970 | b->overlays_before = Fcons (overlay, b->overlays_before); |
| 1971 | |
| 1972 | /* This puts it in the right list, and in the right order. */ |
| 1973 | recenter_overlay_lists (b, XINT (b->overlay_center)); |
| 1974 | |
| 1975 | return unbind_to (count, overlay); |
| 1976 | } |
| 1977 | |
| 1978 | DEFUN ("delete-overlay", Fdelete_overlay, Sdelete_overlay, 1, 1, 0, |
| 1979 | "Delete the overlay OVERLAY from its buffer.") |
| 1980 | (overlay) |
| 1981 | Lisp_Object overlay; |
| 1982 | { |
| 1983 | Lisp_Object buffer; |
| 1984 | struct buffer *b; |
| 1985 | int count = specpdl_ptr - specpdl; |
| 1986 | |
| 1987 | CHECK_OVERLAY (overlay, 0); |
| 1988 | |
| 1989 | buffer = Fmarker_buffer (OVERLAY_START (overlay)); |
| 1990 | if (NILP (buffer)) |
| 1991 | return Qnil; |
| 1992 | |
| 1993 | b = XBUFFER (buffer); |
| 1994 | |
| 1995 | specbind (Qinhibit_quit, Qt); |
| 1996 | |
| 1997 | b->overlays_before = Fdelq (overlay, b->overlays_before); |
| 1998 | b->overlays_after = Fdelq (overlay, b->overlays_after); |
| 1999 | |
| 2000 | redisplay_region (b, |
| 2001 | marker_position (OVERLAY_START (overlay)), |
| 2002 | marker_position (OVERLAY_END (overlay))); |
| 2003 | |
| 2004 | Fset_marker (OVERLAY_START (overlay), Qnil, Qnil); |
| 2005 | Fset_marker (OVERLAY_END (overlay), Qnil, Qnil); |
| 2006 | |
| 2007 | return unbind_to (count, Qnil); |
| 2008 | } |
| 2009 | \f |
| 2010 | /* Overlay dissection functions. */ |
| 2011 | |
| 2012 | DEFUN ("overlay-start", Foverlay_start, Soverlay_start, 1, 1, 0, |
| 2013 | "Return the position at which OVERLAY starts.") |
| 2014 | (overlay) |
| 2015 | Lisp_Object overlay; |
| 2016 | { |
| 2017 | CHECK_OVERLAY (overlay, 0); |
| 2018 | |
| 2019 | return (Fmarker_position (OVERLAY_START (overlay))); |
| 2020 | } |
| 2021 | |
| 2022 | DEFUN ("overlay-end", Foverlay_end, Soverlay_end, 1, 1, 0, |
| 2023 | "Return the position at which OVERLAY ends.") |
| 2024 | (overlay) |
| 2025 | Lisp_Object overlay; |
| 2026 | { |
| 2027 | CHECK_OVERLAY (overlay, 0); |
| 2028 | |
| 2029 | return (Fmarker_position (OVERLAY_END (overlay))); |
| 2030 | } |
| 2031 | |
| 2032 | DEFUN ("overlay-buffer", Foverlay_buffer, Soverlay_buffer, 1, 1, 0, |
| 2033 | "Return the buffer OVERLAY belongs to.") |
| 2034 | (overlay) |
| 2035 | Lisp_Object overlay; |
| 2036 | { |
| 2037 | CHECK_OVERLAY (overlay, 0); |
| 2038 | |
| 2039 | return Fmarker_buffer (OVERLAY_START (overlay)); |
| 2040 | } |
| 2041 | |
| 2042 | DEFUN ("overlay-properties", Foverlay_properties, Soverlay_properties, 1, 1, 0, |
| 2043 | "Return a list of the properties on OVERLAY.\n\ |
| 2044 | This is a copy of OVERLAY's plist; modifying its conses has no effect on\n\ |
| 2045 | OVERLAY.") |
| 2046 | (overlay) |
| 2047 | Lisp_Object overlay; |
| 2048 | { |
| 2049 | CHECK_OVERLAY (overlay, 0); |
| 2050 | |
| 2051 | return Fcopy_sequence (XOVERLAY (overlay)->plist); |
| 2052 | } |
| 2053 | |
| 2054 | \f |
| 2055 | DEFUN ("overlays-at", Foverlays_at, Soverlays_at, 1, 1, 0, |
| 2056 | "Return a list of the overlays that contain position POS.") |
| 2057 | (pos) |
| 2058 | Lisp_Object pos; |
| 2059 | { |
| 2060 | int noverlays; |
| 2061 | Lisp_Object *overlay_vec; |
| 2062 | int len; |
| 2063 | Lisp_Object result; |
| 2064 | |
| 2065 | CHECK_NUMBER_COERCE_MARKER (pos, 0); |
| 2066 | |
| 2067 | len = 10; |
| 2068 | overlay_vec = (Lisp_Object *) xmalloc (len * sizeof (Lisp_Object)); |
| 2069 | |
| 2070 | /* Put all the overlays we want in a vector in overlay_vec. |
| 2071 | Store the length in len. */ |
| 2072 | noverlays = overlays_at (XINT (pos), 1, &overlay_vec, &len, NULL, NULL); |
| 2073 | |
| 2074 | /* Make a list of them all. */ |
| 2075 | result = Flist (noverlays, overlay_vec); |
| 2076 | |
| 2077 | xfree (overlay_vec); |
| 2078 | return result; |
| 2079 | } |
| 2080 | |
| 2081 | DEFUN ("next-overlay-change", Fnext_overlay_change, Snext_overlay_change, |
| 2082 | 1, 1, 0, |
| 2083 | "Return the next position after POS where an overlay starts or ends.\n\ |
| 2084 | If there are no more overlay boundaries after POS, return (point-max).") |
| 2085 | (pos) |
| 2086 | Lisp_Object pos; |
| 2087 | { |
| 2088 | int noverlays; |
| 2089 | int endpos; |
| 2090 | Lisp_Object *overlay_vec; |
| 2091 | int len; |
| 2092 | int i; |
| 2093 | |
| 2094 | CHECK_NUMBER_COERCE_MARKER (pos, 0); |
| 2095 | |
| 2096 | len = 10; |
| 2097 | overlay_vec = (Lisp_Object *) xmalloc (len * sizeof (Lisp_Object)); |
| 2098 | |
| 2099 | /* Put all the overlays we want in a vector in overlay_vec. |
| 2100 | Store the length in len. |
| 2101 | endpos gets the position where the next overlay starts. */ |
| 2102 | noverlays = overlays_at (XINT (pos), 1, &overlay_vec, &len, &endpos, NULL); |
| 2103 | |
| 2104 | /* If any of these overlays ends before endpos, |
| 2105 | use its ending point instead. */ |
| 2106 | for (i = 0; i < noverlays; i++) |
| 2107 | { |
| 2108 | Lisp_Object oend; |
| 2109 | int oendpos; |
| 2110 | |
| 2111 | oend = OVERLAY_END (overlay_vec[i]); |
| 2112 | oendpos = OVERLAY_POSITION (oend); |
| 2113 | if (oendpos < endpos) |
| 2114 | endpos = oendpos; |
| 2115 | } |
| 2116 | |
| 2117 | xfree (overlay_vec); |
| 2118 | return make_number (endpos); |
| 2119 | } |
| 2120 | |
| 2121 | DEFUN ("previous-overlay-change", Fprevious_overlay_change, |
| 2122 | Sprevious_overlay_change, 1, 1, 0, |
| 2123 | "Return the previous position before POS where an overlay starts or ends.\n\ |
| 2124 | If there are no more overlay boundaries after POS, return (point-min).") |
| 2125 | (pos) |
| 2126 | Lisp_Object pos; |
| 2127 | { |
| 2128 | int noverlays; |
| 2129 | int prevpos; |
| 2130 | Lisp_Object *overlay_vec; |
| 2131 | int len; |
| 2132 | int i; |
| 2133 | |
| 2134 | CHECK_NUMBER_COERCE_MARKER (pos, 0); |
| 2135 | |
| 2136 | len = 10; |
| 2137 | overlay_vec = (Lisp_Object *) xmalloc (len * sizeof (Lisp_Object)); |
| 2138 | |
| 2139 | /* Put all the overlays we want in a vector in overlay_vec. |
| 2140 | Store the length in len. |
| 2141 | prevpos gets the position of an overlay end. */ |
| 2142 | noverlays = overlays_at (XINT (pos), 1, &overlay_vec, &len, NULL, &prevpos); |
| 2143 | |
| 2144 | /* If any of these overlays starts before endpos, |
| 2145 | maybe use its starting point instead. */ |
| 2146 | for (i = 0; i < noverlays; i++) |
| 2147 | { |
| 2148 | Lisp_Object ostart; |
| 2149 | int ostartpos; |
| 2150 | |
| 2151 | ostart = OVERLAY_START (overlay_vec[i]); |
| 2152 | ostartpos = OVERLAY_POSITION (ostart); |
| 2153 | if (ostartpos > prevpos && ostartpos < XINT (pos)) |
| 2154 | prevpos = ostartpos; |
| 2155 | } |
| 2156 | |
| 2157 | xfree (overlay_vec); |
| 2158 | return make_number (prevpos); |
| 2159 | } |
| 2160 | \f |
| 2161 | /* These functions are for debugging overlays. */ |
| 2162 | |
| 2163 | DEFUN ("overlay-lists", Foverlay_lists, Soverlay_lists, 0, 0, 0, |
| 2164 | "Return a pair of lists giving all the overlays of the current buffer.\n\ |
| 2165 | The car has all the overlays before the overlay center;\n\ |
| 2166 | the cdr has all the overlays after the overlay center.\n\ |
| 2167 | Recentering overlays moves overlays between these lists.\n\ |
| 2168 | The lists you get are copies, so that changing them has no effect.\n\ |
| 2169 | However, the overlays you get are the real objects that the buffer uses.") |
| 2170 | () |
| 2171 | { |
| 2172 | Lisp_Object before, after; |
| 2173 | before = current_buffer->overlays_before; |
| 2174 | if (CONSP (before)) |
| 2175 | before = Fcopy_sequence (before); |
| 2176 | after = current_buffer->overlays_after; |
| 2177 | if (CONSP (after)) |
| 2178 | after = Fcopy_sequence (after); |
| 2179 | |
| 2180 | return Fcons (before, after); |
| 2181 | } |
| 2182 | |
| 2183 | DEFUN ("overlay-recenter", Foverlay_recenter, Soverlay_recenter, 1, 1, 0, |
| 2184 | "Recenter the overlays of the current buffer around position POS.") |
| 2185 | (pos) |
| 2186 | Lisp_Object pos; |
| 2187 | { |
| 2188 | CHECK_NUMBER_COERCE_MARKER (pos, 0); |
| 2189 | |
| 2190 | recenter_overlay_lists (current_buffer, XINT (pos)); |
| 2191 | return Qnil; |
| 2192 | } |
| 2193 | \f |
| 2194 | DEFUN ("overlay-get", Foverlay_get, Soverlay_get, 2, 2, 0, |
| 2195 | "Get the property of overlay OVERLAY with property name NAME.") |
| 2196 | (overlay, prop) |
| 2197 | Lisp_Object overlay, prop; |
| 2198 | { |
| 2199 | Lisp_Object plist, fallback; |
| 2200 | |
| 2201 | CHECK_OVERLAY (overlay, 0); |
| 2202 | |
| 2203 | fallback = Qnil; |
| 2204 | |
| 2205 | for (plist = XOVERLAY (overlay)->plist; |
| 2206 | CONSP (plist) && CONSP (XCONS (plist)->cdr); |
| 2207 | plist = XCONS (XCONS (plist)->cdr)->cdr) |
| 2208 | { |
| 2209 | if (EQ (XCONS (plist)->car, prop)) |
| 2210 | return XCONS (XCONS (plist)->cdr)->car; |
| 2211 | else if (EQ (XCONS (plist)->car, Qcategory)) |
| 2212 | { |
| 2213 | Lisp_Object tem; |
| 2214 | tem = Fcar (Fcdr (plist)); |
| 2215 | if (SYMBOLP (tem)) |
| 2216 | fallback = Fget (tem, prop); |
| 2217 | } |
| 2218 | } |
| 2219 | |
| 2220 | return fallback; |
| 2221 | } |
| 2222 | |
| 2223 | DEFUN ("overlay-put", Foverlay_put, Soverlay_put, 3, 3, 0, |
| 2224 | "Set one property of overlay OVERLAY: give property PROP value VALUE.") |
| 2225 | (overlay, prop, value) |
| 2226 | Lisp_Object overlay, prop, value; |
| 2227 | { |
| 2228 | Lisp_Object tail, buffer; |
| 2229 | int changed; |
| 2230 | |
| 2231 | CHECK_OVERLAY (overlay, 0); |
| 2232 | |
| 2233 | buffer = Fmarker_buffer (OVERLAY_START (overlay)); |
| 2234 | |
| 2235 | for (tail = XOVERLAY (overlay)->plist; |
| 2236 | CONSP (tail) && CONSP (XCONS (tail)->cdr); |
| 2237 | tail = XCONS (XCONS (tail)->cdr)->cdr) |
| 2238 | if (EQ (XCONS (tail)->car, prop)) |
| 2239 | { |
| 2240 | changed = !EQ (XCONS (XCONS (tail)->cdr)->car, value); |
| 2241 | XCONS (XCONS (tail)->cdr)->car = value; |
| 2242 | goto found; |
| 2243 | } |
| 2244 | /* It wasn't in the list, so add it to the front. */ |
| 2245 | changed = !NILP (value); |
| 2246 | XOVERLAY (overlay)->plist |
| 2247 | = Fcons (prop, Fcons (value, XOVERLAY (overlay)->plist)); |
| 2248 | found: |
| 2249 | if (! NILP (buffer)) |
| 2250 | { |
| 2251 | if (changed) |
| 2252 | redisplay_region (XBUFFER (buffer), |
| 2253 | marker_position (OVERLAY_START (overlay)), |
| 2254 | marker_position (OVERLAY_END (overlay))); |
| 2255 | if (EQ (prop, Qevaporate) && ! NILP (value) |
| 2256 | && (OVERLAY_POSITION (OVERLAY_START (overlay)) |
| 2257 | == OVERLAY_POSITION (OVERLAY_END (overlay)))) |
| 2258 | Fdelete_overlay (overlay); |
| 2259 | } |
| 2260 | return value; |
| 2261 | } |
| 2262 | \f |
| 2263 | /* Run the modification-hooks of overlays that include |
| 2264 | any part of the text in START to END. |
| 2265 | Run the insert-before-hooks of overlay starting at END, |
| 2266 | and the insert-after-hooks of overlay ending at START. */ |
| 2267 | |
| 2268 | void |
| 2269 | verify_overlay_modification (start, end) |
| 2270 | Lisp_Object start, end; |
| 2271 | { |
| 2272 | Lisp_Object prop, overlay, tail; |
| 2273 | int insertion = EQ (start, end); |
| 2274 | int tail_copied; |
| 2275 | struct gcpro gcpro1, gcpro2; |
| 2276 | |
| 2277 | overlay = Qnil; |
| 2278 | tail = Qnil; |
| 2279 | GCPRO2 (overlay, tail); |
| 2280 | |
| 2281 | tail_copied = 0; |
| 2282 | for (tail = current_buffer->overlays_before; |
| 2283 | CONSP (tail); |
| 2284 | tail = XCONS (tail)->cdr) |
| 2285 | { |
| 2286 | int startpos, endpos; |
| 2287 | Lisp_Object ostart, oend; |
| 2288 | |
| 2289 | overlay = XCONS (tail)->car; |
| 2290 | |
| 2291 | ostart = OVERLAY_START (overlay); |
| 2292 | oend = OVERLAY_END (overlay); |
| 2293 | endpos = OVERLAY_POSITION (oend); |
| 2294 | if (XFASTINT (start) > endpos) |
| 2295 | break; |
| 2296 | startpos = OVERLAY_POSITION (ostart); |
| 2297 | if (XFASTINT (end) == startpos && insertion) |
| 2298 | { |
| 2299 | prop = Foverlay_get (overlay, Qinsert_in_front_hooks); |
| 2300 | if (!NILP (prop)) |
| 2301 | { |
| 2302 | /* Copy TAIL in case the hook recenters the overlay lists. */ |
| 2303 | if (!tail_copied) |
| 2304 | tail = Fcopy_sequence (tail); |
| 2305 | tail_copied = 1; |
| 2306 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2307 | } |
| 2308 | } |
| 2309 | if (XFASTINT (start) == endpos && insertion) |
| 2310 | { |
| 2311 | prop = Foverlay_get (overlay, Qinsert_behind_hooks); |
| 2312 | if (!NILP (prop)) |
| 2313 | { |
| 2314 | if (!tail_copied) |
| 2315 | tail = Fcopy_sequence (tail); |
| 2316 | tail_copied = 1; |
| 2317 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2318 | } |
| 2319 | } |
| 2320 | /* Test for intersecting intervals. This does the right thing |
| 2321 | for both insertion and deletion. */ |
| 2322 | if (XFASTINT (end) > startpos && XFASTINT (start) < endpos) |
| 2323 | { |
| 2324 | prop = Foverlay_get (overlay, Qmodification_hooks); |
| 2325 | if (!NILP (prop)) |
| 2326 | { |
| 2327 | if (!tail_copied) |
| 2328 | tail = Fcopy_sequence (tail); |
| 2329 | tail_copied = 1; |
| 2330 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2331 | } |
| 2332 | } |
| 2333 | } |
| 2334 | |
| 2335 | tail_copied = 0; |
| 2336 | for (tail = current_buffer->overlays_after; |
| 2337 | CONSP (tail); |
| 2338 | tail = XCONS (tail)->cdr) |
| 2339 | { |
| 2340 | int startpos, endpos; |
| 2341 | Lisp_Object ostart, oend; |
| 2342 | |
| 2343 | overlay = XCONS (tail)->car; |
| 2344 | |
| 2345 | ostart = OVERLAY_START (overlay); |
| 2346 | oend = OVERLAY_END (overlay); |
| 2347 | startpos = OVERLAY_POSITION (ostart); |
| 2348 | endpos = OVERLAY_POSITION (oend); |
| 2349 | if (XFASTINT (end) < startpos) |
| 2350 | break; |
| 2351 | if (XFASTINT (end) == startpos && insertion) |
| 2352 | { |
| 2353 | prop = Foverlay_get (overlay, Qinsert_in_front_hooks); |
| 2354 | if (!NILP (prop)) |
| 2355 | { |
| 2356 | if (!tail_copied) |
| 2357 | tail = Fcopy_sequence (tail); |
| 2358 | tail_copied = 1; |
| 2359 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2360 | } |
| 2361 | } |
| 2362 | if (XFASTINT (start) == endpos && insertion) |
| 2363 | { |
| 2364 | prop = Foverlay_get (overlay, Qinsert_behind_hooks); |
| 2365 | if (!NILP (prop)) |
| 2366 | { |
| 2367 | if (!tail_copied) |
| 2368 | tail = Fcopy_sequence (tail); |
| 2369 | tail_copied = 1; |
| 2370 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2371 | } |
| 2372 | } |
| 2373 | /* Test for intersecting intervals. This does the right thing |
| 2374 | for both insertion and deletion. */ |
| 2375 | if (XFASTINT (end) > startpos && XFASTINT (start) < endpos) |
| 2376 | { |
| 2377 | prop = Foverlay_get (overlay, Qmodification_hooks); |
| 2378 | if (!NILP (prop)) |
| 2379 | { |
| 2380 | if (!tail_copied) |
| 2381 | tail = Fcopy_sequence (tail); |
| 2382 | tail_copied = 1; |
| 2383 | call_overlay_mod_hooks (prop, overlay, start, end); |
| 2384 | } |
| 2385 | } |
| 2386 | } |
| 2387 | |
| 2388 | UNGCPRO; |
| 2389 | } |
| 2390 | |
| 2391 | static void |
| 2392 | call_overlay_mod_hooks (list, overlay, start, end) |
| 2393 | Lisp_Object list, overlay, start, end; |
| 2394 | { |
| 2395 | struct gcpro gcpro1; |
| 2396 | GCPRO1 (list); |
| 2397 | while (!NILP (list)) |
| 2398 | { |
| 2399 | call3 (Fcar (list), overlay, start, end); |
| 2400 | list = Fcdr (list); |
| 2401 | } |
| 2402 | UNGCPRO; |
| 2403 | } |
| 2404 | |
| 2405 | /* Delete any zero-sized overlays at position POS, if the `evaporate' |
| 2406 | property is set. */ |
| 2407 | void |
| 2408 | evaporate_overlays (pos) |
| 2409 | int pos; |
| 2410 | { |
| 2411 | Lisp_Object tail, overlay, hit_list; |
| 2412 | |
| 2413 | hit_list = Qnil; |
| 2414 | if (pos <= XFASTINT (current_buffer->overlay_center)) |
| 2415 | for (tail = current_buffer->overlays_before; CONSP (tail); |
| 2416 | tail = XCONS (tail)->cdr) |
| 2417 | { |
| 2418 | int endpos; |
| 2419 | overlay = XCONS (tail)->car; |
| 2420 | endpos = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 2421 | if (endpos < pos) |
| 2422 | break; |
| 2423 | if (endpos == pos && OVERLAY_POSITION (OVERLAY_START (overlay)) == pos |
| 2424 | && Foverlay_get (overlay, Qevaporate)) |
| 2425 | hit_list = Fcons (overlay, hit_list); |
| 2426 | } |
| 2427 | else |
| 2428 | for (tail = current_buffer->overlays_after; CONSP (tail); |
| 2429 | tail = XCONS (tail)->cdr) |
| 2430 | { |
| 2431 | int startpos; |
| 2432 | overlay = XCONS (tail)->car; |
| 2433 | startpos = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 2434 | if (startpos > pos) |
| 2435 | break; |
| 2436 | if (startpos == pos && OVERLAY_POSITION (OVERLAY_END (overlay)) == pos |
| 2437 | && Foverlay_get (overlay, Qevaporate)) |
| 2438 | hit_list = Fcons (overlay, hit_list); |
| 2439 | } |
| 2440 | for (; CONSP (hit_list); hit_list = XCONS (hit_list)->cdr) |
| 2441 | Fdelete_overlay (XCONS (hit_list)->car); |
| 2442 | } |
| 2443 | \f |
| 2444 | /* Somebody has tried to store a value with an unacceptable type |
| 2445 | into the buffer-local slot with offset OFFSET. */ |
| 2446 | void |
| 2447 | buffer_slot_type_mismatch (offset) |
| 2448 | int offset; |
| 2449 | { |
| 2450 | Lisp_Object sym; |
| 2451 | char *type_name; |
| 2452 | sym = *(Lisp_Object *)(offset + (char *)&buffer_local_symbols); |
| 2453 | switch (XINT (*(Lisp_Object *)(offset + (char *)&buffer_local_types))) |
| 2454 | { |
| 2455 | case Lisp_Int: type_name = "integers"; break; |
| 2456 | case Lisp_String: type_name = "strings"; break; |
| 2457 | case Lisp_Symbol: type_name = "symbols"; break; |
| 2458 | default: |
| 2459 | abort (); |
| 2460 | } |
| 2461 | |
| 2462 | error ("only %s should be stored in the buffer-local variable %s", |
| 2463 | type_name, XSYMBOL (sym)->name->data); |
| 2464 | } |
| 2465 | \f |
| 2466 | init_buffer_once () |
| 2467 | { |
| 2468 | register Lisp_Object tem; |
| 2469 | |
| 2470 | /* Make sure all markable slots in buffer_defaults |
| 2471 | are initialized reasonably, so mark_buffer won't choke. */ |
| 2472 | reset_buffer (&buffer_defaults); |
| 2473 | reset_buffer_local_variables (&buffer_defaults); |
| 2474 | reset_buffer (&buffer_local_symbols); |
| 2475 | reset_buffer_local_variables (&buffer_local_symbols); |
| 2476 | XSETBUFFER (Vbuffer_defaults, &buffer_defaults); |
| 2477 | XSETBUFFER (Vbuffer_local_symbols, &buffer_local_symbols); |
| 2478 | |
| 2479 | /* Set up the default values of various buffer slots. */ |
| 2480 | /* Must do these before making the first buffer! */ |
| 2481 | |
| 2482 | /* real setup is done in loaddefs.el */ |
| 2483 | buffer_defaults.mode_line_format = build_string ("%-"); |
| 2484 | buffer_defaults.abbrev_mode = Qnil; |
| 2485 | buffer_defaults.overwrite_mode = Qnil; |
| 2486 | buffer_defaults.case_fold_search = Qt; |
| 2487 | buffer_defaults.auto_fill_function = Qnil; |
| 2488 | buffer_defaults.selective_display = Qnil; |
| 2489 | #ifndef old |
| 2490 | buffer_defaults.selective_display_ellipses = Qt; |
| 2491 | #endif |
| 2492 | buffer_defaults.abbrev_table = Qnil; |
| 2493 | buffer_defaults.display_table = Qnil; |
| 2494 | buffer_defaults.undo_list = Qnil; |
| 2495 | buffer_defaults.mark_active = Qnil; |
| 2496 | buffer_defaults.overlays_before = Qnil; |
| 2497 | buffer_defaults.overlays_after = Qnil; |
| 2498 | XSETFASTINT (buffer_defaults.overlay_center, 1); |
| 2499 | |
| 2500 | XSETFASTINT (buffer_defaults.tab_width, 8); |
| 2501 | buffer_defaults.truncate_lines = Qnil; |
| 2502 | buffer_defaults.ctl_arrow = Qt; |
| 2503 | |
| 2504 | #ifdef DOS_NT |
| 2505 | buffer_defaults.buffer_file_type = Qnil; /* TEXT */ |
| 2506 | #endif |
| 2507 | XSETFASTINT (buffer_defaults.fill_column, 70); |
| 2508 | XSETFASTINT (buffer_defaults.left_margin, 0); |
| 2509 | buffer_defaults.cache_long_line_scans = Qnil; |
| 2510 | |
| 2511 | /* Assign the local-flags to the slots that have default values. |
| 2512 | The local flag is a bit that is used in the buffer |
| 2513 | to say that it has its own local value for the slot. |
| 2514 | The local flag bits are in the local_var_flags slot of the buffer. */ |
| 2515 | |
| 2516 | /* Nothing can work if this isn't true */ |
| 2517 | if (sizeof (EMACS_INT) != sizeof (Lisp_Object)) abort (); |
| 2518 | |
| 2519 | /* 0 means not a lisp var, -1 means always local, else mask */ |
| 2520 | bzero (&buffer_local_flags, sizeof buffer_local_flags); |
| 2521 | XSETINT (buffer_local_flags.filename, -1); |
| 2522 | XSETINT (buffer_local_flags.directory, -1); |
| 2523 | XSETINT (buffer_local_flags.backed_up, -1); |
| 2524 | XSETINT (buffer_local_flags.save_length, -1); |
| 2525 | XSETINT (buffer_local_flags.auto_save_file_name, -1); |
| 2526 | XSETINT (buffer_local_flags.read_only, -1); |
| 2527 | XSETINT (buffer_local_flags.major_mode, -1); |
| 2528 | XSETINT (buffer_local_flags.mode_name, -1); |
| 2529 | XSETINT (buffer_local_flags.undo_list, -1); |
| 2530 | XSETINT (buffer_local_flags.mark_active, -1); |
| 2531 | |
| 2532 | XSETFASTINT (buffer_local_flags.mode_line_format, 1); |
| 2533 | XSETFASTINT (buffer_local_flags.abbrev_mode, 2); |
| 2534 | XSETFASTINT (buffer_local_flags.overwrite_mode, 4); |
| 2535 | XSETFASTINT (buffer_local_flags.case_fold_search, 8); |
| 2536 | XSETFASTINT (buffer_local_flags.auto_fill_function, 0x10); |
| 2537 | XSETFASTINT (buffer_local_flags.selective_display, 0x20); |
| 2538 | #ifndef old |
| 2539 | XSETFASTINT (buffer_local_flags.selective_display_ellipses, 0x40); |
| 2540 | #endif |
| 2541 | XSETFASTINT (buffer_local_flags.tab_width, 0x80); |
| 2542 | XSETFASTINT (buffer_local_flags.truncate_lines, 0x100); |
| 2543 | XSETFASTINT (buffer_local_flags.ctl_arrow, 0x200); |
| 2544 | XSETFASTINT (buffer_local_flags.fill_column, 0x400); |
| 2545 | XSETFASTINT (buffer_local_flags.left_margin, 0x800); |
| 2546 | XSETFASTINT (buffer_local_flags.abbrev_table, 0x1000); |
| 2547 | XSETFASTINT (buffer_local_flags.display_table, 0x2000); |
| 2548 | XSETFASTINT (buffer_local_flags.syntax_table, 0x8000); |
| 2549 | XSETFASTINT (buffer_local_flags.cache_long_line_scans, 0x10000); |
| 2550 | #ifdef DOS_NT |
| 2551 | XSETFASTINT (buffer_local_flags.buffer_file_type, 0x4000); |
| 2552 | #endif |
| 2553 | |
| 2554 | Vbuffer_alist = Qnil; |
| 2555 | current_buffer = 0; |
| 2556 | all_buffers = 0; |
| 2557 | |
| 2558 | QSFundamental = build_string ("Fundamental"); |
| 2559 | |
| 2560 | Qfundamental_mode = intern ("fundamental-mode"); |
| 2561 | buffer_defaults.major_mode = Qfundamental_mode; |
| 2562 | |
| 2563 | Qmode_class = intern ("mode-class"); |
| 2564 | |
| 2565 | Qprotected_field = intern ("protected-field"); |
| 2566 | |
| 2567 | Qpermanent_local = intern ("permanent-local"); |
| 2568 | |
| 2569 | Qkill_buffer_hook = intern ("kill-buffer-hook"); |
| 2570 | |
| 2571 | Vprin1_to_string_buffer = Fget_buffer_create (build_string (" prin1")); |
| 2572 | /* super-magic invisible buffer */ |
| 2573 | Vbuffer_alist = Qnil; |
| 2574 | |
| 2575 | Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); |
| 2576 | } |
| 2577 | |
| 2578 | init_buffer () |
| 2579 | { |
| 2580 | char buf[MAXPATHLEN+1]; |
| 2581 | char *pwd; |
| 2582 | struct stat dotstat, pwdstat; |
| 2583 | Lisp_Object temp; |
| 2584 | int rc; |
| 2585 | |
| 2586 | Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); |
| 2587 | |
| 2588 | /* If PWD is accurate, use it instead of calling getwd. This is faster |
| 2589 | when PWD is right, and may avoid a fatal error. */ |
| 2590 | if ((pwd = getenv ("PWD")) != 0 && IS_DIRECTORY_SEP (*pwd) |
| 2591 | && stat (pwd, &pwdstat) == 0 |
| 2592 | && stat (".", &dotstat) == 0 |
| 2593 | && dotstat.st_ino == pwdstat.st_ino |
| 2594 | && dotstat.st_dev == pwdstat.st_dev |
| 2595 | && strlen (pwd) < MAXPATHLEN) |
| 2596 | strcpy (buf, pwd); |
| 2597 | else if (getwd (buf) == 0) |
| 2598 | fatal ("`getwd' failed: %s\n", buf); |
| 2599 | |
| 2600 | #ifndef VMS |
| 2601 | /* Maybe this should really use some standard subroutine |
| 2602 | whose definition is filename syntax dependent. */ |
| 2603 | rc = strlen (buf); |
| 2604 | if (!(IS_DIRECTORY_SEP (buf[rc - 1]))) |
| 2605 | { |
| 2606 | buf[rc] = DIRECTORY_SEP; |
| 2607 | buf[rc + 1] = '\0'; |
| 2608 | } |
| 2609 | #endif /* not VMS */ |
| 2610 | current_buffer->directory = build_string (buf); |
| 2611 | |
| 2612 | temp = get_minibuffer (0); |
| 2613 | XBUFFER (temp)->directory = current_buffer->directory; |
| 2614 | } |
| 2615 | |
| 2616 | /* initialize the buffer routines */ |
| 2617 | syms_of_buffer () |
| 2618 | { |
| 2619 | extern Lisp_Object Qdisabled; |
| 2620 | |
| 2621 | staticpro (&Vbuffer_defaults); |
| 2622 | staticpro (&Vbuffer_local_symbols); |
| 2623 | staticpro (&Qfundamental_mode); |
| 2624 | staticpro (&Qmode_class); |
| 2625 | staticpro (&QSFundamental); |
| 2626 | staticpro (&Vbuffer_alist); |
| 2627 | staticpro (&Qprotected_field); |
| 2628 | staticpro (&Qpermanent_local); |
| 2629 | staticpro (&Qkill_buffer_hook); |
| 2630 | staticpro (&Qoverlayp); |
| 2631 | Qevaporate = intern ("evaporate"); |
| 2632 | staticpro (&Qevaporate); |
| 2633 | staticpro (&Qmodification_hooks); |
| 2634 | Qmodification_hooks = intern ("modification-hooks"); |
| 2635 | staticpro (&Qinsert_in_front_hooks); |
| 2636 | Qinsert_in_front_hooks = intern ("insert-in-front-hooks"); |
| 2637 | staticpro (&Qinsert_behind_hooks); |
| 2638 | Qinsert_behind_hooks = intern ("insert-behind-hooks"); |
| 2639 | staticpro (&Qget_file_buffer); |
| 2640 | Qget_file_buffer = intern ("get-file-buffer"); |
| 2641 | Qpriority = intern ("priority"); |
| 2642 | staticpro (&Qpriority); |
| 2643 | Qwindow = intern ("window"); |
| 2644 | staticpro (&Qwindow); |
| 2645 | |
| 2646 | Qoverlayp = intern ("overlayp"); |
| 2647 | |
| 2648 | Fput (Qprotected_field, Qerror_conditions, |
| 2649 | Fcons (Qprotected_field, Fcons (Qerror, Qnil))); |
| 2650 | Fput (Qprotected_field, Qerror_message, |
| 2651 | build_string ("Attempt to modify a protected field")); |
| 2652 | |
| 2653 | /* All these use DEFVAR_LISP_NOPRO because the slots in |
| 2654 | buffer_defaults will all be marked via Vbuffer_defaults. */ |
| 2655 | |
| 2656 | DEFVAR_LISP_NOPRO ("default-mode-line-format", |
| 2657 | &buffer_defaults.mode_line_format, |
| 2658 | "Default value of `mode-line-format' for buffers that don't override it.\n\ |
| 2659 | This is the same as (default-value 'mode-line-format)."); |
| 2660 | |
| 2661 | DEFVAR_LISP_NOPRO ("default-abbrev-mode", |
| 2662 | &buffer_defaults.abbrev_mode, |
| 2663 | "Default value of `abbrev-mode' for buffers that do not override it.\n\ |
| 2664 | This is the same as (default-value 'abbrev-mode)."); |
| 2665 | |
| 2666 | DEFVAR_LISP_NOPRO ("default-ctl-arrow", |
| 2667 | &buffer_defaults.ctl_arrow, |
| 2668 | "Default value of `ctl-arrow' for buffers that do not override it.\n\ |
| 2669 | This is the same as (default-value 'ctl-arrow)."); |
| 2670 | |
| 2671 | DEFVAR_LISP_NOPRO ("default-truncate-lines", |
| 2672 | &buffer_defaults.truncate_lines, |
| 2673 | "Default value of `truncate-lines' for buffers that do not override it.\n\ |
| 2674 | This is the same as (default-value 'truncate-lines)."); |
| 2675 | |
| 2676 | DEFVAR_LISP_NOPRO ("default-fill-column", |
| 2677 | &buffer_defaults.fill_column, |
| 2678 | "Default value of `fill-column' for buffers that do not override it.\n\ |
| 2679 | This is the same as (default-value 'fill-column)."); |
| 2680 | |
| 2681 | DEFVAR_LISP_NOPRO ("default-left-margin", |
| 2682 | &buffer_defaults.left_margin, |
| 2683 | "Default value of `left-margin' for buffers that do not override it.\n\ |
| 2684 | This is the same as (default-value 'left-margin)."); |
| 2685 | |
| 2686 | DEFVAR_LISP_NOPRO ("default-tab-width", |
| 2687 | &buffer_defaults.tab_width, |
| 2688 | "Default value of `tab-width' for buffers that do not override it.\n\ |
| 2689 | This is the same as (default-value 'tab-width)."); |
| 2690 | |
| 2691 | DEFVAR_LISP_NOPRO ("default-case-fold-search", |
| 2692 | &buffer_defaults.case_fold_search, |
| 2693 | "Default value of `case-fold-search' for buffers that don't override it.\n\ |
| 2694 | This is the same as (default-value 'case-fold-search)."); |
| 2695 | |
| 2696 | #ifdef DOS_NT |
| 2697 | DEFVAR_LISP_NOPRO ("default-buffer-file-type", |
| 2698 | &buffer_defaults.buffer_file_type, |
| 2699 | "Default file type for buffers that do not override it.\n\ |
| 2700 | This is the same as (default-value 'buffer-file-type).\n\ |
| 2701 | The file type is nil for text, t for binary."); |
| 2702 | #endif |
| 2703 | |
| 2704 | DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, |
| 2705 | Qnil, 0); |
| 2706 | |
| 2707 | /* This doc string is too long for cpp; cpp dies if it isn't in a comment. |
| 2708 | But make-docfile finds it! |
| 2709 | DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, |
| 2710 | Qnil, |
| 2711 | "Template for displaying mode line for current buffer.\n\ |
| 2712 | Each buffer has its own value of this variable.\n\ |
| 2713 | Value may be a string, a symbol or a list or cons cell.\n\ |
| 2714 | For a symbol, its value is used (but it is ignored if t or nil).\n\ |
| 2715 | A string appearing directly as the value of a symbol is processed verbatim\n\ |
| 2716 | in that the %-constructs below are not recognized.\n\ |
| 2717 | For a list whose car is a symbol, the symbol's value is taken,\n\ |
| 2718 | and if that is non-nil, the cadr of the list is processed recursively.\n\ |
| 2719 | Otherwise, the caddr of the list (if there is one) is processed.\n\ |
| 2720 | For a list whose car is a string or list, each element is processed\n\ |
| 2721 | recursively and the results are effectively concatenated.\n\ |
| 2722 | For a list whose car is an integer, the cdr of the list is processed\n\ |
| 2723 | and padded (if the number is positive) or truncated (if negative)\n\ |
| 2724 | to the width specified by that number.\n\ |
| 2725 | A string is printed verbatim in the mode line except for %-constructs:\n\ |
| 2726 | (%-constructs are allowed when the string is the entire mode-line-format\n\ |
| 2727 | or when it is found in a cons-cell or a list)\n\ |
| 2728 | %b -- print buffer name. %f -- print visited file name.\n\ |
| 2729 | %* -- print %, * or hyphen. %+ -- print *, % or hyphen.\n\ |
| 2730 | % means buffer is read-only and * means it is modified.\n\ |
| 2731 | For a modified read-only buffer, %* gives % and %+ gives *.\n\ |
| 2732 | %s -- print process status. %l -- print the current line number.\n\ |
| 2733 | %p -- print percent of buffer above top of window, or Top, Bot or All.\n\ |
| 2734 | %P -- print percent of buffer above bottom of window, perhaps plus Top,\n\ |
| 2735 | or print Bottom or All.\n\ |
| 2736 | %n -- print Narrow if appropriate.\n\ |
| 2737 | %t -- print T if files is text, B if binary.\n\ |
| 2738 | %[ -- print one [ for each recursive editing level. %] similar.\n\ |
| 2739 | %% -- print %. %- -- print infinitely many dashes.\n\ |
| 2740 | Decimal digits after the % specify field width to which to pad."); |
| 2741 | */ |
| 2742 | |
| 2743 | DEFVAR_LISP_NOPRO ("default-major-mode", &buffer_defaults.major_mode, |
| 2744 | "*Major mode for new buffers. Defaults to `fundamental-mode'.\n\ |
| 2745 | nil here means use current buffer's major mode."); |
| 2746 | |
| 2747 | DEFVAR_PER_BUFFER ("major-mode", ¤t_buffer->major_mode, |
| 2748 | make_number (Lisp_Symbol), |
| 2749 | "Symbol for current buffer's major mode."); |
| 2750 | |
| 2751 | DEFVAR_PER_BUFFER ("mode-name", ¤t_buffer->mode_name, |
| 2752 | make_number (Lisp_String), |
| 2753 | "Pretty name of current buffer's major mode (a string)."); |
| 2754 | |
| 2755 | DEFVAR_PER_BUFFER ("abbrev-mode", ¤t_buffer->abbrev_mode, Qnil, |
| 2756 | "Non-nil turns on automatic expansion of abbrevs as they are inserted.\n\ |
| 2757 | Automatically becomes buffer-local when set in any fashion."); |
| 2758 | |
| 2759 | DEFVAR_PER_BUFFER ("case-fold-search", ¤t_buffer->case_fold_search, |
| 2760 | Qnil, |
| 2761 | "*Non-nil if searches should ignore case.\n\ |
| 2762 | Automatically becomes buffer-local when set in any fashion."); |
| 2763 | |
| 2764 | DEFVAR_PER_BUFFER ("fill-column", ¤t_buffer->fill_column, |
| 2765 | make_number (Lisp_Int), |
| 2766 | "*Column beyond which automatic line-wrapping should happen.\n\ |
| 2767 | Automatically becomes buffer-local when set in any fashion."); |
| 2768 | |
| 2769 | DEFVAR_PER_BUFFER ("left-margin", ¤t_buffer->left_margin, |
| 2770 | make_number (Lisp_Int), |
| 2771 | "*Column for the default indent-line-function to indent to.\n\ |
| 2772 | Linefeed indents to this column in Fundamental mode.\n\ |
| 2773 | Automatically becomes buffer-local when set in any fashion."); |
| 2774 | |
| 2775 | DEFVAR_PER_BUFFER ("tab-width", ¤t_buffer->tab_width, |
| 2776 | make_number (Lisp_Int), |
| 2777 | "*Distance between tab stops (for display of tab characters), in columns.\n\ |
| 2778 | Automatically becomes buffer-local when set in any fashion."); |
| 2779 | |
| 2780 | DEFVAR_PER_BUFFER ("ctl-arrow", ¤t_buffer->ctl_arrow, Qnil, |
| 2781 | "*Non-nil means display control chars with uparrow.\n\ |
| 2782 | Nil means use backslash and octal digits.\n\ |
| 2783 | Automatically becomes buffer-local when set in any fashion.\n\ |
| 2784 | This variable does not apply to characters whose display is specified\n\ |
| 2785 | in the current display table (if there is one)."); |
| 2786 | |
| 2787 | DEFVAR_PER_BUFFER ("truncate-lines", ¤t_buffer->truncate_lines, Qnil, |
| 2788 | "*Non-nil means do not display continuation lines;\n\ |
| 2789 | give each line of text one screen line.\n\ |
| 2790 | Automatically becomes buffer-local when set in any fashion.\n\ |
| 2791 | \n\ |
| 2792 | Note that this is overridden by the variable\n\ |
| 2793 | `truncate-partial-width-windows' if that variable is non-nil\n\ |
| 2794 | and this buffer is not full-frame width."); |
| 2795 | |
| 2796 | #ifdef DOS_NT |
| 2797 | DEFVAR_PER_BUFFER ("buffer-file-type", ¤t_buffer->buffer_file_type, |
| 2798 | Qnil, |
| 2799 | "*If visited file is text, nil; otherwise, t."); |
| 2800 | #endif |
| 2801 | |
| 2802 | DEFVAR_PER_BUFFER ("default-directory", ¤t_buffer->directory, |
| 2803 | make_number (Lisp_String), |
| 2804 | "Name of default directory of current buffer. Should end with slash.\n\ |
| 2805 | Each buffer has its own value of this variable."); |
| 2806 | |
| 2807 | DEFVAR_PER_BUFFER ("auto-fill-function", ¤t_buffer->auto_fill_function, |
| 2808 | Qnil, |
| 2809 | "Function called (if non-nil) to perform auto-fill.\n\ |
| 2810 | It is called after self-inserting a space at a column beyond `fill-column'.\n\ |
| 2811 | Each buffer has its own value of this variable.\n\ |
| 2812 | NOTE: This variable is not an ordinary hook;\n\ |
| 2813 | It may not be a list of functions."); |
| 2814 | |
| 2815 | DEFVAR_PER_BUFFER ("buffer-file-name", ¤t_buffer->filename, |
| 2816 | make_number (Lisp_String), |
| 2817 | "Name of file visited in current buffer, or nil if not visiting a file.\n\ |
| 2818 | Each buffer has its own value of this variable."); |
| 2819 | |
| 2820 | DEFVAR_PER_BUFFER ("buffer-auto-save-file-name", |
| 2821 | ¤t_buffer->auto_save_file_name, |
| 2822 | make_number (Lisp_String), |
| 2823 | "Name of file for auto-saving current buffer,\n\ |
| 2824 | or nil if buffer should not be auto-saved.\n\ |
| 2825 | Each buffer has its own value of this variable."); |
| 2826 | |
| 2827 | DEFVAR_PER_BUFFER ("buffer-read-only", ¤t_buffer->read_only, Qnil, |
| 2828 | "Non-nil if this buffer is read-only.\n\ |
| 2829 | Each buffer has its own value of this variable."); |
| 2830 | |
| 2831 | DEFVAR_PER_BUFFER ("buffer-backed-up", ¤t_buffer->backed_up, Qnil, |
| 2832 | "Non-nil if this buffer's file has been backed up.\n\ |
| 2833 | Backing up is done before the first time the file is saved.\n\ |
| 2834 | Each buffer has its own value of this variable."); |
| 2835 | |
| 2836 | DEFVAR_PER_BUFFER ("buffer-saved-size", ¤t_buffer->save_length, |
| 2837 | make_number (Lisp_Int), |
| 2838 | "Length of current buffer when last read in, saved or auto-saved.\n\ |
| 2839 | 0 initially.\n\ |
| 2840 | Each buffer has its own value of this variable."); |
| 2841 | |
| 2842 | DEFVAR_PER_BUFFER ("selective-display", ¤t_buffer->selective_display, |
| 2843 | Qnil, |
| 2844 | "Non-nil enables selective display:\n\ |
| 2845 | Integer N as value means display only lines\n\ |
| 2846 | that start with less than n columns of space.\n\ |
| 2847 | A value of t means, after a ^M, all the rest of the line is invisible.\n\ |
| 2848 | Then ^M's in the file are written into files as newlines.\n\n\ |
| 2849 | Automatically becomes buffer-local when set in any fashion."); |
| 2850 | |
| 2851 | #ifndef old |
| 2852 | DEFVAR_PER_BUFFER ("selective-display-ellipses", |
| 2853 | ¤t_buffer->selective_display_ellipses, |
| 2854 | Qnil, |
| 2855 | "t means display ... on previous line when a line is invisible.\n\ |
| 2856 | Automatically becomes buffer-local when set in any fashion."); |
| 2857 | #endif |
| 2858 | |
| 2859 | DEFVAR_PER_BUFFER ("overwrite-mode", ¤t_buffer->overwrite_mode, Qnil, |
| 2860 | "Non-nil if self-insertion should replace existing text.\n\ |
| 2861 | If non-nil and not `overwrite-mode-binary', self-insertion still\n\ |
| 2862 | inserts at the end of a line, and inserts when point is before a tab,\n\ |
| 2863 | until the tab is filled in.\n\ |
| 2864 | If `overwrite-mode-binary', self-insertion replaces newlines and tabs too.\n\ |
| 2865 | Automatically becomes buffer-local when set in any fashion."); |
| 2866 | |
| 2867 | #if 0 /* The doc string is too long for some compilers, |
| 2868 | but make-docfile can find it in this comment. */ |
| 2869 | DEFVAR_PER_BUFFER ("buffer-display-table", ¤t_buffer->display_table, |
| 2870 | Qnil, |
| 2871 | "Display table that controls display of the contents of current buffer.\n\ |
| 2872 | Automatically becomes buffer-local when set in any fashion.\n\ |
| 2873 | The display table is a vector created with `make-display-table'.\n\ |
| 2874 | The first 256 elements control how to display each possible text character.\n\ |
| 2875 | Each value should be a vector of characters or nil;\n\ |
| 2876 | nil means display the character in the default fashion.\n\ |
| 2877 | The remaining six elements control the display of\n\ |
| 2878 | the end of a truncated screen line (element 256, a single character);\n\ |
| 2879 | the end of a continued line (element 257, a single character);\n\ |
| 2880 | the escape character used to display character codes in octal\n\ |
| 2881 | (element 258, a single character);\n\ |
| 2882 | the character used as an arrow for control characters (element 259,\n\ |
| 2883 | a single character);\n\ |
| 2884 | the decoration indicating the presence of invisible lines (element 260,\n\ |
| 2885 | a vector of characters);\n\ |
| 2886 | the character used to draw the border between side-by-side windows\n\ |
| 2887 | (element 261, a single character).\n\ |
| 2888 | If this variable is nil, the value of `standard-display-table' is used.\n\ |
| 2889 | Each window can have its own, overriding display table."); |
| 2890 | #endif |
| 2891 | DEFVAR_PER_BUFFER ("buffer-display-table", ¤t_buffer->display_table, |
| 2892 | Qnil, 0); |
| 2893 | |
| 2894 | /*DEFVAR_LISP ("debug-check-symbol", &Vcheck_symbol, |
| 2895 | "Don't ask."); |
| 2896 | */ |
| 2897 | DEFVAR_LISP ("before-change-function", &Vbefore_change_function, |
| 2898 | "Function to call before each text change.\n\ |
| 2899 | Two arguments are passed to the function: the positions of\n\ |
| 2900 | the beginning and end of the range of old text to be changed.\n\ |
| 2901 | \(For an insertion, the beginning and end are at the same place.)\n\ |
| 2902 | No information is given about the length of the text after the change.\n\ |
| 2903 | \n\ |
| 2904 | Buffer changes made while executing the `before-change-function'\n\ |
| 2905 | don't call any before-change or after-change functions.\n\ |
| 2906 | That's because these variables are temporarily set to nil.\n\ |
| 2907 | As a result, a hook function cannot straightforwardly alter the value of\n\ |
| 2908 | these variables. See the Emacs Lisp manual for a way of\n\ |
| 2909 | accomplishing an equivalent result by using other variables."); |
| 2910 | Vbefore_change_function = Qnil; |
| 2911 | |
| 2912 | DEFVAR_LISP ("after-change-function", &Vafter_change_function, |
| 2913 | "Function to call after each text change.\n\ |
| 2914 | Three arguments are passed to the function: the positions of\n\ |
| 2915 | the beginning and end of the range of changed text,\n\ |
| 2916 | and the length of the pre-change text replaced by that range.\n\ |
| 2917 | \(For an insertion, the pre-change length is zero;\n\ |
| 2918 | for a deletion, that length is the number of characters deleted,\n\ |
| 2919 | and the post-change beginning and end are at the same place.)\n\ |
| 2920 | \n\ |
| 2921 | Buffer changes made while executing the `after-change-function'\n\ |
| 2922 | don't call any before-change or after-change functions.\n\ |
| 2923 | That's because these variables are temporarily set to nil.\n\ |
| 2924 | As a result, a hook function cannot straightforwardly alter the value of\n\ |
| 2925 | these variables. See the Emacs Lisp manual for a way of\n\ |
| 2926 | accomplishing an equivalent result by using other variables."); |
| 2927 | Vafter_change_function = Qnil; |
| 2928 | |
| 2929 | DEFVAR_LISP ("before-change-functions", &Vbefore_change_functions, |
| 2930 | "List of functions to call before each text change.\n\ |
| 2931 | Two arguments are passed to each function: the positions of\n\ |
| 2932 | the beginning and end of the range of old text to be changed.\n\ |
| 2933 | \(For an insertion, the beginning and end are at the same place.)\n\ |
| 2934 | No information is given about the length of the text after the change.\n\ |
| 2935 | \n\ |
| 2936 | Buffer changes made while executing the `before-change-functions'\n\ |
| 2937 | don't call any before-change or after-change functions.\n\ |
| 2938 | That's because these variables are temporarily set to nil.\n\ |
| 2939 | As a result, a hook function cannot straightforwardly alter the value of\n\ |
| 2940 | these variables. See the Emacs Lisp manual for a way of\n\ |
| 2941 | accomplishing an equivalent result by using other variables."); |
| 2942 | Vbefore_change_functions = Qnil; |
| 2943 | |
| 2944 | DEFVAR_LISP ("after-change-functions", &Vafter_change_functions, |
| 2945 | "List of function to call after each text change.\n\ |
| 2946 | Three arguments are passed to each function: the positions of\n\ |
| 2947 | the beginning and end of the range of changed text,\n\ |
| 2948 | and the length of the pre-change text replaced by that range.\n\ |
| 2949 | \(For an insertion, the pre-change length is zero;\n\ |
| 2950 | for a deletion, that length is the number of characters deleted,\n\ |
| 2951 | and the post-change beginning and end are at the same place.)\n\ |
| 2952 | \n\ |
| 2953 | Buffer changes made while executing the `after-change-functions'\n\ |
| 2954 | don't call any before-change or after-change functions.\n\ |
| 2955 | That's because these variables are temporarily set to nil.\n\ |
| 2956 | As a result, a hook function cannot straightforwardly alter the value of\n\ |
| 2957 | these variables. See the Emacs Lisp manual for a way of\n\ |
| 2958 | accomplishing an equivalent result by using other variables."); |
| 2959 | |
| 2960 | Vafter_change_functions = Qnil; |
| 2961 | |
| 2962 | DEFVAR_LISP ("first-change-hook", &Vfirst_change_hook, |
| 2963 | "A list of functions to call before changing a buffer which is unmodified.\n\ |
| 2964 | The functions are run using the `run-hooks' function."); |
| 2965 | Vfirst_change_hook = Qnil; |
| 2966 | Qfirst_change_hook = intern ("first-change-hook"); |
| 2967 | staticpro (&Qfirst_change_hook); |
| 2968 | |
| 2969 | #if 0 /* The doc string is too long for some compilers, |
| 2970 | but make-docfile can find it in this comment. */ |
| 2971 | DEFVAR_PER_BUFFER ("buffer-undo-list", ¤t_buffer->undo_list, Qnil, |
| 2972 | "List of undo entries in current buffer.\n\ |
| 2973 | Recent changes come first; older changes follow newer.\n\ |
| 2974 | \n\ |
| 2975 | An entry (START . END) represents an insertion which begins at\n\ |
| 2976 | position START and ends at position END.\n\ |
| 2977 | \n\ |
| 2978 | An entry (TEXT . POSITION) represents the deletion of the string TEXT\n\ |
| 2979 | from (abs POSITION). If POSITION is positive, point was at the front\n\ |
| 2980 | of the text being deleted; if negative, point was at the end.\n\ |
| 2981 | \n\ |
| 2982 | An entry (t HIGHWORD LOWWORD) indicates that the buffer had been\n\ |
| 2983 | previously unmodified. HIGHWORD and LOWWORD are the high and low\n\ |
| 2984 | 16-bit words of the buffer's modification count at the time. If the\n\ |
| 2985 | modification count of the most recent save is different, this entry is\n\ |
| 2986 | obsolete.\n\ |
| 2987 | \n\ |
| 2988 | An entry (nil PROP VAL BEG . END) indicates that a text property\n\ |
| 2989 | was modified between BEG and END. PROP is the property name,\n\ |
| 2990 | and VAL is the old value.\n\ |
| 2991 | \n\ |
| 2992 | An entry of the form POSITION indicates that point was at the buffer\n\ |
| 2993 | location given by the integer. Undoing an entry of this form places\n\ |
| 2994 | point at POSITION.\n\ |
| 2995 | \n\ |
| 2996 | nil marks undo boundaries. The undo command treats the changes\n\ |
| 2997 | between two undo boundaries as a single step to be undone.\n\ |
| 2998 | \n\ |
| 2999 | If the value of the variable is t, undo information is not recorded."); |
| 3000 | #endif |
| 3001 | DEFVAR_PER_BUFFER ("buffer-undo-list", ¤t_buffer->undo_list, Qnil, |
| 3002 | 0); |
| 3003 | |
| 3004 | DEFVAR_PER_BUFFER ("mark-active", ¤t_buffer->mark_active, Qnil, |
| 3005 | "Non-nil means the mark and region are currently active in this buffer.\n\ |
| 3006 | Automatically local in all buffers."); |
| 3007 | |
| 3008 | DEFVAR_PER_BUFFER ("cache-long-line-scans", ¤t_buffer->cache_long_line_scans, Qnil, |
| 3009 | "Non-nil means that Emacs should use caches to handle long lines more quickly.\n\ |
| 3010 | This variable is buffer-local, in all buffers.\n\ |
| 3011 | \n\ |
| 3012 | Normally, the line-motion functions work by scanning the buffer for\n\ |
| 3013 | newlines. Columnar operations (like move-to-column and\n\ |
| 3014 | compute-motion) also work by scanning the buffer, summing character\n\ |
| 3015 | widths as they go. This works well for ordinary text, but if the\n\ |
| 3016 | buffer's lines are very long (say, more than 500 characters), these\n\ |
| 3017 | motion functions will take longer to execute. Emacs may also take\n\ |
| 3018 | longer to update the display.\n\ |
| 3019 | \n\ |
| 3020 | If cache-long-line-scans is non-nil, these motion functions cache the\n\ |
| 3021 | results of their scans, and consult the cache to avoid rescanning\n\ |
| 3022 | regions of the buffer until the text is modified. The caches are most\n\ |
| 3023 | beneficial when they prevent the most searching---that is, when the\n\ |
| 3024 | buffer contains long lines and large regions of characters with the\n\ |
| 3025 | same, fixed screen width.\n\ |
| 3026 | \n\ |
| 3027 | When cache-long-line-scans is non-nil, processing short lines will\n\ |
| 3028 | become slightly slower (because of the overhead of consulting the\n\ |
| 3029 | cache), and the caches will use memory roughly proportional to the\n\ |
| 3030 | number of newlines and characters whose screen width varies.\n\ |
| 3031 | \n\ |
| 3032 | The caches require no explicit maintenance; their accuracy is\n\ |
| 3033 | maintained internally by the Emacs primitives. Enabling or disabling\n\ |
| 3034 | the cache should not affect the behavior of any of the motion\n\ |
| 3035 | functions; it should only affect their performance."); |
| 3036 | |
| 3037 | DEFVAR_LISP ("transient-mark-mode", &Vtransient_mark_mode, |
| 3038 | "*Non-nil means deactivate the mark when the buffer contents change."); |
| 3039 | Vtransient_mark_mode = Qnil; |
| 3040 | |
| 3041 | DEFVAR_LISP ("inhibit-read-only", &Vinhibit_read_only, |
| 3042 | "*Non-nil means disregard read-only status of buffers or characters.\n\ |
| 3043 | If the value is t, disregard `buffer-read-only' and all `read-only'\n\ |
| 3044 | text properties. If the value is a list, disregard `buffer-read-only'\n\ |
| 3045 | and disregard a `read-only' text property if the property value\n\ |
| 3046 | is a member of the list."); |
| 3047 | Vinhibit_read_only = Qnil; |
| 3048 | |
| 3049 | DEFVAR_LISP ("kill-buffer-query-functions", &Vkill_buffer_query_functions, |
| 3050 | "List of functions called with no args to query before killing a buffer."); |
| 3051 | Vkill_buffer_query_functions = Qnil; |
| 3052 | |
| 3053 | defsubr (&Sbuffer_list); |
| 3054 | defsubr (&Sget_buffer); |
| 3055 | defsubr (&Sget_file_buffer); |
| 3056 | defsubr (&Sget_buffer_create); |
| 3057 | defsubr (&Sgenerate_new_buffer_name); |
| 3058 | defsubr (&Sbuffer_name); |
| 3059 | /*defsubr (&Sbuffer_number);*/ |
| 3060 | defsubr (&Sbuffer_file_name); |
| 3061 | defsubr (&Sbuffer_local_variables); |
| 3062 | defsubr (&Sbuffer_modified_p); |
| 3063 | defsubr (&Sset_buffer_modified_p); |
| 3064 | defsubr (&Sbuffer_modified_tick); |
| 3065 | defsubr (&Srename_buffer); |
| 3066 | defsubr (&Sother_buffer); |
| 3067 | defsubr (&Sbuffer_disable_undo); |
| 3068 | defsubr (&Sbuffer_enable_undo); |
| 3069 | defsubr (&Skill_buffer); |
| 3070 | defsubr (&Serase_buffer); |
| 3071 | defsubr (&Sset_buffer_major_mode); |
| 3072 | defsubr (&Sswitch_to_buffer); |
| 3073 | defsubr (&Spop_to_buffer); |
| 3074 | defsubr (&Scurrent_buffer); |
| 3075 | defsubr (&Sset_buffer); |
| 3076 | defsubr (&Sbarf_if_buffer_read_only); |
| 3077 | defsubr (&Sbury_buffer); |
| 3078 | defsubr (&Slist_buffers); |
| 3079 | defsubr (&Skill_all_local_variables); |
| 3080 | |
| 3081 | defsubr (&Soverlayp); |
| 3082 | defsubr (&Smake_overlay); |
| 3083 | defsubr (&Sdelete_overlay); |
| 3084 | defsubr (&Smove_overlay); |
| 3085 | defsubr (&Soverlay_start); |
| 3086 | defsubr (&Soverlay_end); |
| 3087 | defsubr (&Soverlay_buffer); |
| 3088 | defsubr (&Soverlay_properties); |
| 3089 | defsubr (&Soverlays_at); |
| 3090 | defsubr (&Snext_overlay_change); |
| 3091 | defsubr (&Sprevious_overlay_change); |
| 3092 | defsubr (&Soverlay_recenter); |
| 3093 | defsubr (&Soverlay_lists); |
| 3094 | defsubr (&Soverlay_get); |
| 3095 | defsubr (&Soverlay_put); |
| 3096 | } |
| 3097 | |
| 3098 | keys_of_buffer () |
| 3099 | { |
| 3100 | initial_define_key (control_x_map, 'b', "switch-to-buffer"); |
| 3101 | initial_define_key (control_x_map, 'k', "kill-buffer"); |
| 3102 | initial_define_key (control_x_map, Ctl ('B'), "list-buffers"); |
| 3103 | |
| 3104 | /* This must not be in syms_of_buffer, because Qdisabled is not |
| 3105 | initialized when that function gets called. */ |
| 3106 | Fput (intern ("erase-buffer"), Qdisabled, Qt); |
| 3107 | } |