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OS/2 Shareware BBS: 5 Edit
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20.3.1
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cmds.c
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1999-07-31
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/* Simple built-in editing commands.
Copyright (C) 1985, 93, 94, 95, 96, 97, 1998 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 2, 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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Modified for emx by Jeremy Bowen, May 1999 based on patches
to v19.33 by Eberhard Mattes */
#include <config.h>
#include "lisp.h"
#include "commands.h"
#include "buffer.h"
#include "charset.h"
#include "syntax.h"
#include "window.h"
#include "keyboard.h"
#include "dispextern.h"
Lisp_Object Qkill_forward_chars, Qkill_backward_chars, Vblink_paren_function;
/* A possible value for a buffer's overwrite-mode variable. */
Lisp_Object Qoverwrite_mode_binary;
/* Non-nil means put this face on the next self-inserting character. */
Lisp_Object Vself_insert_face;
/* This is the command that set up Vself_insert_face. */
Lisp_Object Vself_insert_face_command;
extern Lisp_Object Qface;
DEFUN ("forward-point", Fforward_point, Sforward_point, 1, 1, 0,
"Return buffer position N characters after (before if N negative) point.")
(n)
Lisp_Object n;
{
CHECK_NUMBER (n, 0);
return make_number (PT + XINT (n));
}
DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p",
"Move point right N characters (left if N is negative).\n\
On reaching end of buffer, stop and signal error.")
(n)
Lisp_Object n;
{
if (NILP (n))
XSETFASTINT (n, 1);
else
CHECK_NUMBER (n, 0);
/* 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 = PT + 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);
}
return Qnil;
}
DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "p",
"Move point left N characters (right if N is negative).\n\
On attempt to pass beginning or end of buffer, stop and signal error.")
(n)
Lisp_Object n;
{
if (NILP (n))
XSETFASTINT (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 N lines forward (backward if N is negative).\n\
Precisely, if point is on line I, move to the start of line I + N.\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 N - number of lines moved; if backward, N + number moved.\n\
With positive N, a non-empty line at the end counts as one line\n\
successfully moved (for the return value).")
(n)
Lisp_Object n;
{
int opoint = PT, opoint_byte = PT_BYTE;
int pos, pos_byte;
int count, shortage;
int temp;
if (NILP (n))
count = 1;
else
{
CHECK_NUMBER (n, 0);
count = XINT (n);
}
if (count <= 0)
shortage = scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, count - 1, 1);
else
shortage = scan_newline (PT, PT_BYTE, ZV, ZV_BYTE, count, 1);
/* Since scan_newline does TEMP_SET_PT_BOTH,
and we want to set PT "for real",
go back to the old point and then come back here. */
pos = PT;
pos_byte = PT_BYTE;
TEMP_SET_PT_BOTH (opoint, opoint_byte);
SET_PT_BOTH (pos, pos_byte);
if (shortage > 0
&& (count <= 0
|| (ZV > BEGV
&& PT != opoint
&& (FETCH_BYTE (PT_BYTE - 1) != '\n'))))
shortage--;
return make_number (count <= 0 ? - 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 N not nil or 1, move forward N - 1 lines first.\n\
If scan reaches end of buffer, stop there without error.")
(n)
Lisp_Object n;
{
if (NILP (n))
XSETFASTINT (n, 1);
else
CHECK_NUMBER (n, 0);
SET_PT (XINT (Fline_beginning_position (n)));
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 N not nil or 1, move forward N - 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))
XSETFASTINT (n, 1);
else
CHECK_NUMBER (n, 0);
SET_PT (XINT (Fline_end_position (n)));
return Qnil;
}
DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
"Delete the following N characters (previous if N is negative).\n\
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
Interactively, N is the prefix arg, and KILLFLAG is set if\n\
N was explicitly specified.")
(n, killflag)
Lisp_Object n, killflag;
{
int pos;
CHECK_NUMBER (n, 0);
pos = PT + XINT (n);
if (NILP (killflag))
{
if (XINT (n) < 0)
{
if (pos < BEGV)
Fsignal (Qbeginning_of_buffer, Qnil);
else
del_range (pos, PT);
}
else
{
if (pos > ZV)
Fsignal (Qend_of_buffer, Qnil);
else
del_range (PT, pos);
}
}
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 N characters (following if N is negative).\n\
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).\n\
Interactively, N is the prefix arg, and KILLFLAG is set if\n\
N was explicitly specified.")
(n, killflag)
Lisp_Object n, killflag;
{
Lisp_Object value;
int deleted_special = 0;
int pos, pos_byte, i;
CHECK_NUMBER (n, 0);
/* See if we are about to delete a tab or newline backwards. */
pos = PT;
pos_byte = PT_BYTE;
for (i = 0; i < XINT (n) && pos_byte > BEGV_BYTE; i++)
{
int c;
DEC_BOTH (pos, pos_byte);
c = FETCH_BYTE (pos_byte);
if (c == '\t' || c == '\n')
{
deleted_special = 1;
break;
}
}
/* In overwrite mode, back over columns while clearing them out,
unless at end of line. */
if (XINT (n) > 0
&& ! NILP (current_buffer->overwrite_mode)
&& ! deleted_special
&& ! (PT == ZV || FETCH_BYTE (PT_BYTE) == '\n'))
{
int column = current_column ();
value = Fdelete_char (make_number (-XINT (n)), killflag);
i = column - current_column ();
Finsert_char (make_number (' '), make_number (i), Qnil);
/* Whitespace chars are ASCII chars, so we can simply subtract. */
SET_PT_BOTH (PT - i, PT_BYTE - i);
}
else
value = Fdelete_char (make_number (-XINT (n)), killflag);
return value;
}
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.")
(n)
Lisp_Object n;
{
int character = XINT (last_command_char);
CHECK_NUMBER (n, 0);
/* Barf if the key that invoked this was not a character. */
if (!INTEGERP (last_command_char))
bitch_at_user ();
else if (XINT (n) >= 2 && NILP (current_buffer->overwrite_mode))
{
int modified_char = character;
/* Add the offset to the character, for Finsert_char.
We pass internal_self_insert the unmodified character
because it itself does this offsetting. */
if (! NILP (current_buffer->enable_multibyte_characters))
modified_char = unibyte_char_to_multibyte (modified_char);
XSETFASTINT (n, XFASTINT (n) - 2);
/* The first one might want to expand an abbrev. */
internal_self_insert (character, 1);
/* The bulk of the copies of this char can be inserted simply.
We don't have to handle a user-specified face specially
because it will get inherited from the first char inserted. */
Finsert_char (make_number (modified_char), n, Qt);
/* The last one might want to auto-fill. */
internal_self_insert (character, 0);
}
else
while (XINT (n) > 0)
{
/* Ok since old and new vals both nonneg */
XSETFASTINT (n, XFASTINT (n) - 1);
internal_self_insert (character, XFASTINT (n) != 0);
}
return Qnil;
}
/* Insert character C. 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.
A value of 2 means this did things that call for an undo boundary. */
int
internal_self_insert (c, noautofill)
int c;
int noautofill;
{
extern Lisp_Object Fexpand_abbrev ();
int hairy = 0;
Lisp_Object tem;
register enum syntaxcode synt;
Lisp_Object overwrite, string;
/* Length of multi-byte form of C. */
int len;
/* Working buffer and pointer for multi-byte form of C. */
unsigned char workbuf[4], *str;
int chars_to_delete = 0;
int spaces_to_insert = 0;
overwrite = current_buffer->overwrite_mode;
if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function)
|| !NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions))
hairy = 1;
/* At first, get multi-byte form of C in STR. */
if (!NILP (current_buffer->enable_multibyte_characters))
{
c = unibyte_char_to_multibyte (c);
len = CHAR_STRING (c, workbuf, str);
}
else
{
workbuf[0] = (SINGLE_BYTE_CHAR_P (c)
? c
: multibyte_char_to_unibyte (c, Qnil));
str = workbuf;
len = 1;
}
if (!NILP (overwrite)
&& PT < ZV)
{
/* In overwrite-mode, we substitute a character at point (C2,
hereafter) by C. For that, we delete C2 in advance. But,
just substituting C2 by C may move a remaining text in the
line to the right or to the left, which is not preferable.
So we insert more spaces or delete more characters in the
following cases: if C is narrower than C2, after deleting C2,
we fill columns with spaces, if C is wider than C2, we delete
C2 and several characters following C2. */
/* This is the character after point. */
int c2 = FETCH_CHAR (PT_BYTE);
/* Column the cursor should be placed at after this insertion.
The correct value should be calculated only when necessary. */
int target_clm = 0;
/* Overwriting in binary-mode always replaces C2 by C.
Overwriting in textual-mode doesn't always do that.
It inserts newlines in the usual way,
and inserts any character at end of line
or before a tab if it doesn't use the whole width of the tab. */
if (EQ (overwrite, Qoverwrite_mode_binary)
|| (c != '\n'
&& c2 != '\n'
&& ! (c2 == '\t'
&& XINT (current_buffer->tab_width) > 0
&& XFASTINT (current_buffer->tab_width) < 20
&& (target_clm = (current_column ()
+ XINT (Fchar_width (make_number (c2)))),
target_clm % XFASTINT (current_buffer->tab_width)))))
{
int pos = PT;
int pos_byte = PT_BYTE;
if (target_clm == 0)
chars_to_delete = 1;
else
{
/* The actual cursor position after the trial of moving
to column TARGET_CLM. It is greater than TARGET_CLM
if the TARGET_CLM is middle of multi-column
character. In that case, the new point is set after
that character. */
int actual_clm
= XFASTINT (Fmove_to_column (make_number (target_clm), Qnil));
chars_to_delete = PT - pos;
if (actual_clm > target_clm)
{
/* We will delete too many columns. Let's fill columns
by spaces so that the remaining text won't move. */
spaces_to_insert = actual_clm - target_clm;
}
}
SET_PT_BOTH (pos, pos_byte);
hairy = 2;
}
hairy = 2;
}
if (!NILP (current_buffer->abbrev_mode)
&& SYNTAX (c) != Sword
&& NILP (current_buffer->read_only)
&& PT > BEGV && SYNTAX (XFASTINT (Fprevious_char ())) == Sword)
{
int modiff = MODIFF;
Lisp_Object sym;
sym = Fexpand_abbrev ();
/* If we expanded an abbrev which has only a hook,
and the hook has a non-nil `no-self-insert' property,
return right away--don't really self-insert. */
if (! NILP (sym) && ! NILP (XSYMBOL (sym)->function)
&& SYMBOLP (XSYMBOL (sym)->function))
{
Lisp_Object prop;
prop = Fget (XSYMBOL (sym)->function, intern ("no-self-insert"));
if (! NILP (prop))
return 1;
}
if (MODIFF != modiff)
hairy = 2;
}
if (chars_to_delete)
{
string = make_string_from_bytes (str, 1, len);
if (spaces_to_insert)
{
tem = Fmake_string (make_number (spaces_to_insert),
make_number (' '));
string = concat2 (tem, string);
}
replace_range (PT, PT + chars_to_delete, string, 1, 1, 1);
Fforward_char (make_number (1 + spaces_to_insert));
}
else
insert_and_inherit (str, len);
if ((c == ' ' || c == '\n')
&& !noautofill
&& !NILP (current_buffer->auto_fill_function))
{
Lisp_Object tem;
if (c == '\n')
/* After inserting a newline, move to previous line and fill
that. Must have the newline in place already so filling and
justification, if any, know where the end is going to be. */
SET_PT_BOTH (PT - 1, PT_BYTE - 1);
tem = call0 (current_buffer->auto_fill_function);
if (c == '\n')
SET_PT_BOTH (PT + 1, PT_BYTE + 1);
if (!NILP (tem))
hairy = 2;
}
#ifdef HAVE_FACES
/* If previous command specified a face to use, use it. */
if (!NILP (Vself_insert_face)
&& EQ (current_kboard->Vlast_command, Vself_insert_face_command))
{
Fput_text_property (make_number (PT - 1), make_number (PT),
Qface, Vself_insert_face, Qnil);
Vself_insert_face = Qnil;
}
#endif
synt = SYNTAX (c);
if ((synt == Sclose || synt == Smath)
&& !NILP (Vblink_paren_function) && INTERACTIVE
&& !noautofill)
{
call0 (Vblink_paren_function);
hairy = 2;
}
return hairy;
}
/* module initialization */
void
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);
Qoverwrite_mode_binary = intern ("overwrite-mode-binary");
staticpro (&Qoverwrite_mode_binary);
DEFVAR_LISP ("self-insert-face", &Vself_insert_face,
"If non-nil, set the face of the next self-inserting character to this.\n\
See also `self-insert-face-command'.");
Vself_insert_face = Qnil;
DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command,
"This is the command that set up `self-insert-face'.\n\
If `last-command' does not equal this value, we ignore `self-insert-face'.");
Vself_insert_face_command = Qnil;
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_point);
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);
}
void
keys_of_cmds ()
{
int n;
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");
#ifdef MSDOS
for (n = 0200; n < 0240; n++)
initial_define_key (global_map, n, "self-insert-command");
#endif
#ifdef EMX
for (n = 0200; n < 0240; n++)
initial_define_key (global_map, n, "self-insert-command");
#endif /* EMX */
for (n = 0240; n < 0400; 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");
}