[bpt/emacs.git] / src / cmds.c

/* 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;

\f
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;
{
  if (NILP (n))
    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;
{
  if (NILP (n))
    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;

  if (NILP (n))
    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;
{
  if (NILP (n))
    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;

  if (NILP (n))
    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);

  if (NILP (killflag))
    {
      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);

  if (!NILP (current_buffer->read_only))
    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
	internal_self_insert ('\n', !NILP (arg1));
      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;

  if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
    hairy = 1;

  if (!NILP (current_buffer->overwrite_mode)
      && 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;
    }
  if (!NILP (current_buffer->abbrev_mode)
      && SYNTAX (c) != Sword
      && NILP (current_buffer->read_only)
      && point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword)
    {
      tem = Fexpand_abbrev ();
      if (!NILP (tem))
	hairy = 1;
    }
  if ((c == ' ' || c == '\n')
      && !noautofill
      && !NILP (current_buffer->auto_fill_function)
      && 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)
      && !NILP (Vblink_paren_function) && INTERACTIVE)
    {
      call0 (Vblink_paren_function);
      hairy = 1;
    }
  return hairy;
}
\f
/* 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");
}
Commit	Line	Data
cd645247 JB	1	/* Simple built-in editing commands.
	2	Copyright (C) 1985 Free Software Foundation, Inc.
	3
	4	This file is part of GNU Emacs.
	5
	6	GNU Emacs is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 1, or (at your option)
	9	any later version.
	10
	11	GNU Emacs is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GNU Emacs; see the file COPYING. If not, write to
	18	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20
	21	#include "config.h"
	22	#include "lisp.h"
	23	#include "commands.h"
	24	#include "buffer.h"
	25	#include "syntax.h"
	26
	27	Lisp_Object Qkill_forward_chars, Qkill_backward_chars, Vblink_paren_function;
	28
	29	\f
	30	DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p",
	31	"Move point right ARG characters (left if ARG negative).\n\
	32	On reaching end of buffer, stop and signal error.")
	33	(n)
	34	Lisp_Object n;
	35	{
265a9e55	36	if (NILP (n))
cd645247 JB	37	XFASTINT (n) = 1;
	38	else
	39	CHECK_NUMBER (n, 0);
	40
	41	SET_PT (point + XINT (n));
	42	if (point < BEGV)
	43	{
	44	SET_PT (BEGV);
	45	Fsignal (Qbeginning_of_buffer, Qnil);
	46	}
	47	if (point > ZV)
	48	{
	49	SET_PT (ZV);
	50	Fsignal (Qend_of_buffer, Qnil);
	51	}
	52	return Qnil;
	53	}
	54
	55	DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p",
	56	"Move point left ARG characters (right if ARG negative).\n\
	57	On attempt to pass beginning or end of buffer, stop and signal error.")
	58	(n)
	59	Lisp_Object n;
	60	{
265a9e55	61	if (NILP (n))
cd645247 JB	62	XFASTINT (n) = 1;
	63	else
	64	CHECK_NUMBER (n, 0);
	65
	66	XSETINT (n, - XINT (n));
	67	return Fforward_char (n);
	68	}
	69
	70	DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "p",
	71	"Move ARG lines forward (backward if ARG is negative).\n\
	72	Precisely, if point is on line I, move to the start of line I + ARG.\n\
	73	If there isn't room, go as far as possible (no error).\n\
	74	Returns the count of lines left to move. If moving forward,\n\
	75	that is ARG - number of lines moved; if backward, ARG + number moved.\n\
	76	With positive ARG, a non-empty line at the end counts as one line\n\
	77	successfully moved (for the return value).")
	78	(n)
	79	Lisp_Object n;
	80	{
	81	int pos2 = point;
	82	int pos;
	83	int count, shortage, negp;
	84
265a9e55	85	if (NILP (n))
cd645247 JB	86	count = 1;
	87	else
	88	{
	89	CHECK_NUMBER (n, 0);
	90	count = XINT (n);
	91	}
	92
	93	negp = count <= 0;
	94	pos = scan_buffer ('\n', pos2, count - negp, &shortage);
	95	if (shortage > 0
	96	&& (negp
	97	\|\| (ZV >= BEGV
	98	&& FETCH_CHAR (pos - 1) != '\n')))
	99	shortage--;
	100	SET_PT (pos);
	101	return make_number (negp ? - shortage : shortage);
	102	}
	103
	104	DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
	105	0, 1, "p",
	106	"Move point to beginning of current line.\n\
	107	With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
	108	If scan reaches end of buffer, stop there without error.")
	109	(n)
	110	Lisp_Object n;
	111	{
265a9e55	112	if (NILP (n))
cd645247 JB	113	XFASTINT (n) = 1;
	114	else
	115	CHECK_NUMBER (n, 0);
	116
	117	Fforward_line (make_number (XINT (n) - 1));
	118	return Qnil;
	119	}
	120
	121	DEFUN ("end-of-line", Fend_of_line, Send_of_line,
	122	0, 1, "p",
	123	"Move point to end of current line.\n\
	124	With argument ARG not nil or 1, move forward ARG - 1 lines first.\n\
	125	If scan reaches end of buffer, stop there without error.")
	126	(n)
	127	Lisp_Object n;
	128	{
	129	register int pos;
	130	register int stop;
	131
265a9e55	132	if (NILP (n))
cd645247 JB	133	XFASTINT (n) = 1;
	134	else
	135	CHECK_NUMBER (n, 0);
	136
	137	if (XINT (n) != 1)
	138	Fforward_line (make_number (XINT (n) - 1));
	139
	140	pos = point;
	141	stop = ZV;
	142	while (pos < stop && FETCH_CHAR (pos) != '\n') pos++;
	143	SET_PT (pos);
	144
	145	return Qnil;
	146	}
	147
	148	DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
	149	"Delete the following ARG characters (previous, with negative arg).\n\
	150	Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
	151	Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
	152	ARG was explicitly specified.")
	153	(n, killflag)
	154	Lisp_Object n, killflag;
	155	{
	156	CHECK_NUMBER (n, 0);
	157
265a9e55	158	if (NILP (killflag))
cd645247 JB	159	{
	160	if (XINT (n) < 0)
	161	{
	162	if (point + XINT (n) < BEGV)
	163	Fsignal (Qbeginning_of_buffer, Qnil);
	164	else
	165	del_range (point + XINT (n), point);
	166	}
	167	else
	168	{
	169	if (point + XINT (n) > ZV)
	170	Fsignal (Qend_of_buffer, Qnil);
	171	else
	172	del_range (point, point + XINT (n));
	173	}
	174	}
	175	else
	176	{
	177	call1 (Qkill_forward_chars, n);
	178	}
	179	return Qnil;
	180	}
	181
	182	DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
	183	1, 2, "p\nP",
	184	"Delete the previous ARG characters (following, with negative ARG).\n\
	185	Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
	186	Interactively, ARG is the prefix arg, and KILLFLAG is set if\n\
	187	ARG was explicitly specified.")
	188	(n, killflag)
	189	Lisp_Object n, killflag;
	190	{
	191	CHECK_NUMBER (n, 0);
	192	return Fdelete_char (make_number (-XINT (n)), killflag);
	193	}
	194
	195	DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p",
	196	"Insert the character you type.\n\
	197	Whichever character you type to run this command is inserted.")
	198	(arg)
	199	Lisp_Object arg;
	200	{
	201	CHECK_NUMBER (arg, 0);
	202
	203	/* Barf if the key that invoked this was not a character. */
	204	if (XTYPE (last_command_char) != Lisp_Int)
	205	bitch_at_user ();
	206	else
	207	while (XINT (arg) > 0)
	208	{
	209	XFASTINT (arg)--; /* Ok since old and new vals both nonneg */
	210	internal_self_insert (XINT (last_command_char), XFASTINT (arg) != 0);
	211	}
	212
	213	return Qnil;
	214	}
	215
	216	DEFUN ("newline", Fnewline, Snewline, 0, 1, "P",
	217	"Insert a newline. With arg, insert that many newlines.\n\
	218	In Auto Fill mode, if no numeric arg, break the preceding line if it's long.")
	219	(arg1)
	220	Lisp_Object arg1;
	221	{
	222	int flag;
223	Lisp_Object arg;
224	char c1 = '\n';
225
226	arg = Fprefix_numeric_value (arg1);
227
265a9e55	228	if (!NILP (current_buffer->read_only))
cd645247 JB	229	Fsignal (Qbuffer_read_only, Qnil);
	230
	231	/* Inserting a newline at the end of a line
	232	produces better redisplay in try_window_id
	233	than inserting at the ebginning fo a line,
	234	And the textual result is the same.
	235	So if at beginning, pretend to be at the end.
	236	Must avoid internal_self_insert in that case since point is wrong.
	237	Luckily internal_self_insert's special features all do nothing in that case. */
	238
	239	flag = point > BEGV && FETCH_CHAR (point - 1) == '\n';
	240	if (flag)
	241	SET_PT (point - 1);
	242
	243	while (XINT (arg) > 0)
	244	{
	245	if (flag)
	246	insert (&c1, 1);
	247	else
265a9e55	248	internal_self_insert ('\n', !NILP (arg1));
cd645247 JB	249	XFASTINT (arg)--; /* Ok since old and new vals both nonneg */
	250	}
	251
	252	if (flag)
	253	SET_PT (point + 1);
	254
	255	return Qnil;
	256	}
	257
	258	internal_self_insert (c1, noautofill)
	259	char c1;
	260	int noautofill;
	261	{
	262	extern Lisp_Object Fexpand_abbrev ();
	263	int hairy = 0;
	264	Lisp_Object tem;
	265	register enum syntaxcode synt;
	266	register int c = c1;
	267
265a9e55	268	if (!NILP (Vbefore_change_function) \|\| !NILP (Vafter_change_function))
cd645247 JB	269	hairy = 1;
cd645247 JB	270
265a9e55	271	if (!NILP (current_buffer->overwrite_mode)
cd645247 JB	272	&& point < ZV
	273	&& c != '\n' && FETCH_CHAR (point) != '\n'
	274	&& (FETCH_CHAR (point) != '\t'
	275	\|\| XINT (current_buffer->tab_width) <= 0
	276	\|\| !((current_column () + 1) % XFASTINT (current_buffer->tab_width))))
	277	{
	278	del_range (point, point + 1);
	279	hairy = 1;
	280	}
265a9e55	281	if (!NILP (current_buffer->abbrev_mode)
cd645247	282	&& SYNTAX (c) != Sword
265a9e55	283	&& NILP (current_buffer->read_only)
cd645247 JB	284	&& point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword)
	285	{
	286	tem = Fexpand_abbrev ();
265a9e55	287	if (!NILP (tem))
cd645247 JB	288	hairy = 1;
	289	}
	290	if ((c == ' ' \|\| c == '\n')
	291	&& !noautofill
265a9e55	292	&& !NILP (current_buffer->auto_fill_function)
cd645247 JB	293	&& current_column () > XFASTINT (current_buffer->fill_column))
	294	{
	295	if (c1 != '\n')
	296	insert (&c1, 1);
	297	call0 (current_buffer->auto_fill_function);
	298	if (c1 == '\n')
	299	insert (&c1, 1);
	300	hairy = 1;
	301	}
	302	else
	303	insert (&c1, 1);
	304	synt = SYNTAX (c);
	305	if ((synt == Sclose \|\| synt == Smath)
265a9e55	306	&& !NILP (Vblink_paren_function) && INTERACTIVE)
cd645247 JB	307	{
	308	call0 (Vblink_paren_function);
	309	hairy = 1;
	310	}
	311	return hairy;
	312	}
	313	\f
	314	/* module initialization */
	315
	316	syms_of_cmds ()
	317	{
	318	Qkill_backward_chars = intern ("kill-backward-chars");
	319	staticpro (&Qkill_backward_chars);
	320
	321	Qkill_forward_chars = intern ("kill-forward-chars");
	322	staticpro (&Qkill_forward_chars);
	323
	324	DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function,
	325	"Function called, if non-nil, whenever a close parenthesis is inserted.\n\
	326	More precisely, a char with closeparen syntax is self-inserted.");
	327	Vblink_paren_function = Qnil;
	328
	329	defsubr (&Sforward_char);
	330	defsubr (&Sbackward_char);
	331	defsubr (&Sforward_line);
	332	defsubr (&Sbeginning_of_line);
	333	defsubr (&Send_of_line);
	334
	335	defsubr (&Sdelete_char);
	336	defsubr (&Sdelete_backward_char);
	337
	338	defsubr (&Sself_insert_command);
	339	defsubr (&Snewline);
	340	}
	341
	342	keys_of_cmds ()
	343	{
	344	int n;
	345
	346	initial_define_key (global_map, Ctl('M'), "newline");
	347	initial_define_key (global_map, Ctl('I'), "self-insert-command");
	348	for (n = 040; n < 0177; n++)
	349	initial_define_key (global_map, n, "self-insert-command");
	350
	351	initial_define_key (global_map, Ctl ('A'), "beginning-of-line");
	352	initial_define_key (global_map, Ctl ('B'), "backward-char");
	353	initial_define_key (global_map, Ctl ('D'), "delete-char");
	354	initial_define_key (global_map, Ctl ('E'), "end-of-line");
	355	initial_define_key (global_map, Ctl ('F'), "forward-char");
	356	initial_define_key (global_map, 0177, "delete-backward-char");
	357	}