cmds.c 9.34 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
/* Simple built-in editing commands.
   Copyright (C) 1985 Free Software Foundation, Inc.

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
the Free Software Foundation; either version 1, or (at your option)
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;


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
36
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
    XFASTINT (n) = 1;
  else
    CHECK_NUMBER (n, 0);

  SET_PT (point + XINT (n));
  if (point < BEGV)
    {
      SET_PT (BEGV);
      Fsignal (Qbeginning_of_buffer, Qnil);
    }
  if (point > ZV)
    {
      SET_PT (ZV);
      Fsignal (Qend_of_buffer, Qnil);
    }
  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
61
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
    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
85
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
    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
	  || (ZV >= BEGV
	      && 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
112
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131
    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
132
  if (NILP (n))
Jim Blandy's avatar
Jim Blandy committed
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
    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
158
  if (NILP (killflag))
Jim Blandy's avatar
Jim Blandy committed
159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
    {
      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
228
  if (!NILP (current_buffer->read_only))
Jim Blandy's avatar
Jim Blandy committed
229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
    Fsignal (Qbuffer_read_only, Qnil);

  /* Inserting a newline at the end of a line
     produces better redisplay in try_window_id
     than inserting at the ebginning fo a line,
     And the textual result is the same.
     So if at beginning, pretend to be at the end.
     Must avoid internal_self_insert in that case since point is wrong.
     Luckily internal_self_insert's special features all do nothing in that case.  */

  flag = point > BEGV && FETCH_CHAR (point - 1) == '\n';
  if (flag)
    SET_PT (point - 1);

  while (XINT (arg) > 0)
    {
      if (flag)
	insert (&c1, 1);
      else
Jim Blandy's avatar
Jim Blandy committed
248
	internal_self_insert ('\n', !NILP (arg1));
Jim Blandy's avatar
Jim Blandy committed
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
      XFASTINT (arg)--;		/* Ok since old and new vals both nonneg */
    }

  if (flag)
    SET_PT (point + 1);

  return Qnil;
}

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;

Jim Blandy's avatar
Jim Blandy committed
268
  if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
Jim Blandy's avatar
Jim Blandy committed
269 270
    hairy = 1;

Jim Blandy's avatar
Jim Blandy committed
271
  if (!NILP (current_buffer->overwrite_mode)
Jim Blandy's avatar
Jim Blandy committed
272 273 274 275 276 277 278 279 280
      && point < ZV
      && c != '\n' && FETCH_CHAR (point) != '\n'
      && (FETCH_CHAR (point) != '\t'
	  || XINT (current_buffer->tab_width) <= 0
	  || !((current_column () + 1) % XFASTINT (current_buffer->tab_width))))
    {
      del_range (point, point + 1);
      hairy = 1;
    }
Jim Blandy's avatar
Jim Blandy committed
281
  if (!NILP (current_buffer->abbrev_mode)
Jim Blandy's avatar
Jim Blandy committed
282
      && SYNTAX (c) != Sword
Jim Blandy's avatar
Jim Blandy committed
283
      && NILP (current_buffer->read_only)
Jim Blandy's avatar
Jim Blandy committed
284 285 286
      && point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword)
    {
      tem = Fexpand_abbrev ();
Jim Blandy's avatar
Jim Blandy committed
287
      if (!NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
288 289 290 291
	hairy = 1;
    }
  if ((c == ' ' || c == '\n')
      && !noautofill
Jim Blandy's avatar
Jim Blandy committed
292
      && !NILP (current_buffer->auto_fill_function)
Jim Blandy's avatar
Jim Blandy committed
293 294 295 296 297 298 299 300 301 302 303 304 305
      && 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
306
      && !NILP (Vblink_paren_function) && INTERACTIVE)
Jim Blandy's avatar
Jim Blandy committed
307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
    {
      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);

  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");

  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");
}