4.4BSD/usr/src/contrib/emacs-18.57/src/cmds.c
/* Simple built-in editing commands.
Copyright (C) 1985, 1990 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_hook;
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 (NULL (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 (NULL (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",
"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.\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 (NULL (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 (NULL (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 (NULL (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 (NULL (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 this character. Prefix arg is repeat-count.")
(arg)
Lisp_Object arg;
{
CHECK_NUMBER (arg, 0);
while (XINT (arg) > 0)
{
XFASTINT (arg)--; /* Ok since old and new vals both nonneg */
self_insert_internal (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, can break the preceding line if no numeric arg.")
(arg1)
Lisp_Object arg1;
{
int flag;
Lisp_Object arg;
char c1 = '\n';
arg = Fprefix_numeric_value (arg1);
if (!NULL (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 self_insert_internal in that case since point is wrong.
Luckily self_insert_internal'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
self_insert_internal ('\n', !NULL (arg1));
XFASTINT (arg)--; /* Ok since old and new vals both nonneg */
}
if (flag)
SET_PT (point + 1);
return Qnil;
}
self_insert_internal (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 (!NULL (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 (!NULL (current_buffer->abbrev_mode)
&& SYNTAX (c) != Sword
&& NULL (current_buffer->read_only)
&& point > BEGV && SYNTAX (FETCH_CHAR (point - 1)) == Sword)
{
tem = Fexpand_abbrev ();
if (!NULL (tem))
hairy = 1;
}
if ((c == ' ' || c == '\n')
&& !noautofill
&& !NULL (current_buffer->auto_fill_hook)
&& current_column () > XFASTINT (current_buffer->fill_column))
{
if (c1 != '\n')
insert (&c1, 1);
call0 (current_buffer->auto_fill_hook);
if (c1 == '\n')
insert (&c1, 1);
hairy = 1;
}
else
insert (&c1, 1);
synt = SYNTAX (c);
if ((synt == Sclose || synt == Smath)
&& !NULL (Vblink_paren_hook) && FROM_KBD)
{
call0 (Vblink_paren_hook);
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-hook", &Vblink_paren_hook,
"Function called, if non-nil, whenever a char with closeparen syntax is self-inserted.");
Vblink_paren_hook = 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;
ndefkey (Vglobal_map, Ctl('M'), "newline");
ndefkey (Vglobal_map, Ctl('I'), "self-insert-command");
for (n = 040; n < 0177; n++)
ndefkey (Vglobal_map, n, "self-insert-command");
ndefkey (Vglobal_map, Ctl ('A'), "beginning-of-line");
ndefkey (Vglobal_map, Ctl ('B'), "backward-char");
ndefkey (Vglobal_map, Ctl ('D'), "delete-char");
ndefkey (Vglobal_map, Ctl ('E'), "end-of-line");
ndefkey (Vglobal_map, Ctl ('F'), "forward-char");
ndefkey (Vglobal_map, 0177, "delete-backward-char");
}