cmds.c 10.9 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Simple built-in editing commands.
Jim Blandy's avatar
Jim Blandy committed
2
   Copyright (C) 1985, 1993 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
Jim Blandy's avatar
Jim Blandy committed
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include "config.h"
#include "lisp.h"
#include "commands.h"
#include "buffer.h"
#include "syntax.h"

Lisp_Object Qkill_forward_chars, Qkill_backward_chars, Vblink_paren_function;

29 30 31
/* A possible value for a buffer's overwrite-mode variable.  */
Lisp_Object Qoverwrite_mode_binary;

Jim Blandy's avatar
Jim Blandy committed
32 33 34 35 36 37 38

DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p",
  "Move point right ARG characters (left if ARG negative).\n\
On reaching end of buffer, stop and signal error.")
  (n)
     Lisp_Object n;
{
Jim Blandy's avatar
Jim Blandy committed
39
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
40 41 42 43
    XFASTINT (n) = 1;
  else
    CHECK_NUMBER (n, 0);

44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65
  /* This used to just set point to point + XINT (n), and then check
     to see if it was within boundaries.  But now that SET_PT can
     potentially do a lot of stuff (calling entering and exiting
     hooks, etcetera), that's not a good approach.  So we validate the
     proposed position, then set point.  */
  {
    int new_point = point + XINT (n);

    if (new_point < BEGV)
      {
	SET_PT (BEGV);
	Fsignal (Qbeginning_of_buffer, Qnil);
      }
    if (new_point > ZV)
      {
	SET_PT (ZV);
	Fsignal (Qend_of_buffer, Qnil);
      }

    SET_PT (new_point);
  }

Jim Blandy's avatar
Jim Blandy committed
66 67 68 69 70 71 72 73 74
  return Qnil;
}

DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p",
  "Move point left ARG characters (right if ARG negative).\n\
On attempt to pass beginning or end of buffer, stop and signal error.")
  (n)
     Lisp_Object n;
{
Jim Blandy's avatar
Jim Blandy committed
75
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
    XFASTINT (n) = 1;
  else
    CHECK_NUMBER (n, 0);

  XSETINT (n, - XINT (n));
  return Fforward_char (n);
}

DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "p",
  "Move ARG lines forward (backward if ARG is negative).\n\
Precisely, if point is on line I, move to the start of line I + ARG.\n\
If there isn't room, go as far as possible (no error).\n\
Returns the count of lines left to move.  If moving forward,\n\
that is ARG - number of lines moved; if backward, ARG + number moved.\n\
With positive ARG, a non-empty line at the end counts as one line\n\
  successfully moved (for the return value).")
  (n)
     Lisp_Object n;
{
  int pos2 = point;
  int pos;
  int count, shortage, negp;

Jim Blandy's avatar
Jim Blandy committed
99
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
100 101 102 103 104 105 106 107 108 109 110
    count = 1;
  else
    {
      CHECK_NUMBER (n, 0);
      count = XINT (n);
    }

  negp = count <= 0;
  pos = scan_buffer ('\n', pos2, count - negp, &shortage);
  if (shortage > 0
      && (negp
Jim Blandy's avatar
Jim Blandy committed
111 112
	  || (ZV > BEGV
	      && pos != pos2
Jim Blandy's avatar
Jim Blandy committed
113 114 115 116 117 118 119 120 121 122 123 124 125 126
	      && FETCH_CHAR (pos - 1) != '\n')))
    shortage--;
  SET_PT (pos);
  return make_number (negp ? - shortage : shortage);
}

DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
  0, 1, "p",
  "Move point to beginning of current line.\n\
With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
If scan reaches end of buffer, stop there without error.")
  (n)
     Lisp_Object n;
{
Jim Blandy's avatar
Jim Blandy committed
127
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
    XFASTINT (n) = 1;
  else
    CHECK_NUMBER (n, 0);

  Fforward_line (make_number (XINT (n) - 1));
  return Qnil;
}

DEFUN ("end-of-line", Fend_of_line, Send_of_line,
  0, 1, "p",
  "Move point to end of current line.\n\
With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
If scan reaches end of buffer, stop there without error.")
  (n)
     Lisp_Object n;
{
  register int pos;
  register int stop;

Jim Blandy's avatar
Jim Blandy committed
147
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
    XFASTINT (n) = 1;
  else
    CHECK_NUMBER (n, 0);

  if (XINT (n) != 1)
    Fforward_line (make_number (XINT (n) - 1));

  pos = point;
  stop = ZV;
  while (pos < stop && FETCH_CHAR (pos) != '\n') pos++;
  SET_PT (pos);

  return Qnil;
}

DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
  "Delete the following ARG characters (previous, with negative arg).\n\
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
ARG was explicitly specified.")
  (n, killflag)
     Lisp_Object n, killflag;
{
  CHECK_NUMBER (n, 0);

Jim Blandy's avatar
Jim Blandy committed
173
  if (NILP (killflag))
Jim Blandy's avatar
Jim Blandy committed
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
    {
      if (XINT (n) < 0)
	{
	  if (point + XINT (n) < BEGV)
	    Fsignal (Qbeginning_of_buffer, Qnil);
	  else
	    del_range (point + XINT (n), point);
	}
      else
	{
	  if (point + XINT (n) > ZV)
	    Fsignal (Qend_of_buffer, Qnil);
	  else
	    del_range (point, point + XINT (n));
	}
    }
  else
    {
      call1 (Qkill_forward_chars, n);
    }
  return Qnil;
}

DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
  1, 2, "p\nP",
  "Delete the previous ARG characters (following, with negative ARG).\n\
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
ARG was explicitly specified.")
  (n, killflag)
     Lisp_Object n, killflag;
{
  CHECK_NUMBER (n, 0);
  return Fdelete_char (make_number (-XINT (n)), killflag);
}

DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p",
  "Insert the character you type.\n\
Whichever character you type to run this command is inserted.")
  (arg)
     Lisp_Object arg;
{
  CHECK_NUMBER (arg, 0);

  /* Barf if the key that invoked this was not a character.  */
  if (XTYPE (last_command_char) != Lisp_Int)
    bitch_at_user ();
  else
    while (XINT (arg) > 0)
      {
	XFASTINT (arg)--;	/* Ok since old and new vals both nonneg */
	internal_self_insert (XINT (last_command_char), XFASTINT (arg) != 0);
      }

  return Qnil;
}

DEFUN ("newline", Fnewline, Snewline, 0, 1, "P",
  "Insert a newline.  With arg, insert that many newlines.\n\
In Auto Fill mode, if no numeric arg, break the preceding line if it's long.")
  (arg1)
     Lisp_Object arg1;
{
  int flag;
  Lisp_Object arg;
  char c1 = '\n';

  arg = Fprefix_numeric_value (arg1);

Jim Blandy's avatar
Jim Blandy committed
243
  if (!NILP (current_buffer->read_only))
244
    Fbarf_if_buffer_read_only ();
Jim Blandy's avatar
Jim Blandy committed
245

Jim Blandy's avatar
Jim Blandy committed
246
  /* Inserting a newline at the end of a line produces better
247
     redisplay in try_window_id than inserting at the beginning of a
Jim Blandy's avatar
Jim Blandy committed
248 249 250 251 252 253
     line, and the textual result is the same.  So, if we're at
     beginning of line, pretend to be at the end of the previous line.  

     We can't use internal_self_insert in that case since it won't do
     the insertion correctly.  Luckily, internal_self_insert's special
     features all do nothing in that case.  */
Jim Blandy's avatar
Jim Blandy committed
254 255

  flag = point > BEGV && FETCH_CHAR (point - 1) == '\n';
256
#ifdef USE_TEXT_PROPERTIES
257 258 259 260 261 262
  /* We cannot use this optimization if properties change
     in the vicinity.
     ??? We need to check for change hook properties, etc.  */
  if (flag)
    if (! (point - 1 > BEGV && ! property_change_between_p (point - 2, point)))
      flag = 0;
263
#endif
264 265 266

  if (flag)
    SET_PT (point - 1);
Jim Blandy's avatar
Jim Blandy committed
267 268 269 270 271 272

  while (XINT (arg) > 0)
    {
      if (flag)
	insert (&c1, 1);
      else
Jim Blandy's avatar
Jim Blandy committed
273
	internal_self_insert ('\n', !NILP (arg1));
Jim Blandy's avatar
Jim Blandy committed
274 275 276 277 278 279 280 281 282
      XFASTINT (arg)--;		/* Ok since old and new vals both nonneg */
    }

  if (flag)
    SET_PT (point + 1);

  return Qnil;
}

283 284 285 286 287 288
/* Insert character C1.  If NOAUTOFILL is nonzero, don't do autofill
   even if it is enabled.

   If this insertion is suitable for direct output (completely simple),
   return 0.  A value of 1 indicates this *might* not have been simple.  */

Jim Blandy's avatar
Jim Blandy committed
289 290 291 292 293 294 295 296 297
internal_self_insert (c1, noautofill)
     char c1;
     int noautofill;
{
  extern Lisp_Object Fexpand_abbrev ();
  int hairy = 0;
  Lisp_Object tem;
  register enum syntaxcode synt;
  register int c = c1;
298
  Lisp_Object overwrite = current_buffer->overwrite_mode;
Jim Blandy's avatar
Jim Blandy committed
299

Jim Blandy's avatar
Jim Blandy committed
300
  if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
Jim Blandy's avatar
Jim Blandy committed
301 302
    hairy = 1;

303
  if (!NILP (overwrite)
Jim Blandy's avatar
Jim Blandy committed
304
      && point < ZV
305 306 307
      && (EQ (overwrite, Qoverwrite_mode_binary)
	  || (c != '\n' && FETCH_CHAR (point) != '\n'))
      && (EQ (overwrite, Qoverwrite_mode_binary)
308
	  || FETCH_CHAR (point) != '\t'
Jim Blandy's avatar
Jim Blandy committed
309
	  || XINT (current_buffer->tab_width) <= 0
310
	  || XFASTINT (current_buffer->tab_width) > 20
Jim Blandy's avatar
Jim Blandy committed
311 312 313 314 315
	  || !((current_column () + 1) % XFASTINT (current_buffer->tab_width))))
    {
      del_range (point, point + 1);
      hairy = 1;
    }
Jim Blandy's avatar
Jim Blandy committed
316
  if (!NILP (current_buffer->abbrev_mode)
Jim Blandy's avatar
Jim Blandy committed
317
      && SYNTAX (c) != Sword
Jim Blandy's avatar
Jim Blandy committed
318
      && NILP (current_buffer->read_only)
Jim Blandy's avatar
Jim Blandy committed
319 320
      && point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword)
    {
321
      int modiff = MODIFF;
322 323
      Fexpand_abbrev ();
      /* We can't trust the value of Fexpand_abbrev,
324 325 326
	 but if Fexpand_abbrev changed the buffer,
	 assume it expanded something.  */
      if (MODIFF != modiff)
Jim Blandy's avatar
Jim Blandy committed
327 328 329 330
	hairy = 1;
    }
  if ((c == ' ' || c == '\n')
      && !noautofill
Jim Blandy's avatar
Jim Blandy committed
331
      && !NILP (current_buffer->auto_fill_function)
Jim Blandy's avatar
Jim Blandy committed
332 333 334 335 336 337 338 339 340 341 342 343 344
      && current_column () > XFASTINT (current_buffer->fill_column))
    {
      if (c1 != '\n')
	insert (&c1, 1);
      call0 (current_buffer->auto_fill_function);
      if (c1 == '\n')
	insert (&c1, 1);
      hairy = 1;
    }
  else
    insert (&c1, 1);
  synt = SYNTAX (c);
  if ((synt == Sclose || synt == Smath)
Jim Blandy's avatar
Jim Blandy committed
345
      && !NILP (Vblink_paren_function) && INTERACTIVE)
Jim Blandy's avatar
Jim Blandy committed
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362
    {
      call0 (Vblink_paren_function);
      hairy = 1;
    }
  return hairy;
}

/* module initialization */

syms_of_cmds ()
{
  Qkill_backward_chars = intern ("kill-backward-chars");
  staticpro (&Qkill_backward_chars);

  Qkill_forward_chars = intern ("kill-forward-chars");
  staticpro (&Qkill_forward_chars);

363 364
  Qoverwrite_mode_binary = intern ("overwrite-mode-binary");
  staticpro (&Qoverwrite_mode_binary);
365

Jim Blandy's avatar
Jim Blandy committed
366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
  DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function,
    "Function called, if non-nil, whenever a close parenthesis is inserted.\n\
More precisely, a char with closeparen syntax is self-inserted.");
  Vblink_paren_function = Qnil;

  defsubr (&Sforward_char);
  defsubr (&Sbackward_char);
  defsubr (&Sforward_line);
  defsubr (&Sbeginning_of_line);
  defsubr (&Send_of_line);

  defsubr (&Sdelete_char);
  defsubr (&Sdelete_backward_char);

  defsubr (&Sself_insert_command);
  defsubr (&Snewline);
}

keys_of_cmds ()
{
  int n;

  initial_define_key (global_map, Ctl('M'), "newline");
  initial_define_key (global_map, Ctl('I'), "self-insert-command");
  for (n = 040; n < 0177; n++)
    initial_define_key (global_map, n, "self-insert-command");
392 393
  for (n = 0240; n < 0377; n++)
    initial_define_key (global_map, n, "self-insert-command");
Jim Blandy's avatar
Jim Blandy committed
394 395 396 397 398 399 400 401

  initial_define_key (global_map, Ctl ('A'), "beginning-of-line");
  initial_define_key (global_map, Ctl ('B'), "backward-char");
  initial_define_key (global_map, Ctl ('D'), "delete-char");
  initial_define_key (global_map, Ctl ('E'), "end-of-line");
  initial_define_key (global_map, Ctl ('F'), "forward-char");
  initial_define_key (global_map, 0177, "delete-backward-char");
}