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- /* 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 traversed at end of buffer \n\
- counts as one line 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 && pos != pos2
- && 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");
- }
-