cmds.c 16.7 KB
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/* Simple built-in editing commands.
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Copyright (C) 1985, 1993-1998, 2001-2015 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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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
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include "lisp.h"
#include "commands.h"
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#include "character.h"
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#include "buffer.h"
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#include "syntax.h"
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#include "window.h"
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#include "keyboard.h"
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#include "keymap.h"
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#include "dispextern.h"
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#include "frame.h"
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static int internal_self_insert (int, EMACS_INT);
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35

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DEFUN ("forward-point", Fforward_point, Sforward_point, 1, 1, 0,
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       doc: /* Return buffer position N characters after (before if N negative) point.  */)
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  (Lisp_Object n)
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{
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  CHECK_NUMBER (n);
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  return make_number (PT + XINT (n));
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}

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/* Add N to point; or subtract N if FORWARD is false.  N defaults to 1.
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   Validate the new location.  Return nil.  */
static Lisp_Object
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move_point (Lisp_Object n, bool forward)
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{
  /* 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.  */

  EMACS_INT new_point;

  if (NILP (n))
    XSETFASTINT (n, 1);
  else
    CHECK_NUMBER (n);

  new_point = PT + (forward ? XINT (n) : - XINT (n));

  if (new_point < BEGV)
    {
      SET_PT (BEGV);
      xsignal0 (Qbeginning_of_buffer);
    }
  if (new_point > ZV)
    {
      SET_PT (ZV);
      xsignal0 (Qend_of_buffer);
    }

  SET_PT (new_point);
  return Qnil;
}

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DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "^p",
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       doc: /* Move point N characters forward (backward if N is negative).
On reaching end or beginning of buffer, stop and signal error.
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Interactively, N is the numeric prefix argument.
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If N is omitted or nil, move point 1 character forward.
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Depending on the bidirectional context, the movement may be to the
right or to the left on the screen.  This is in contrast with
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\\[right-char], which see.  */)
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  (Lisp_Object n)
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{
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  return move_point (n, 1);
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}

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DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 1, "^p",
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       doc: /* Move point N characters backward (forward if N is negative).
On attempt to pass beginning or end of buffer, stop and signal error.
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Interactively, N is the numeric prefix argument.
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If N is omitted or nil, move point 1 character backward.
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Depending on the bidirectional context, the movement may be to the
right or to the left on the screen.  This is in contrast with
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\\[left-char], which see.  */)
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  (Lisp_Object n)
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{
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  return move_point (n, 0);
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}

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DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 1, "^p",
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       doc: /* Move N lines forward (backward if N is negative).
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Precisely, if point is on line I, move to the start of line I + N
\("start of line" in the logical order).
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If there isn't room, go as far as possible (no error).
Returns the count of lines left to move.  If moving forward,
that is N - number of lines moved; if backward, N + number moved.
With positive N, a non-empty line at the end counts as one line
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successfully moved (for the return value).  */)
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  (Lisp_Object n)
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{
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  ptrdiff_t opoint = PT, pos, pos_byte, shortage, count;
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  if (NILP (n))
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    count = 1;
  else
    {
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      CHECK_NUMBER (n);
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      count = XINT (n);
    }

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  shortage = scan_newline_from_point (count, &pos, &pos_byte);
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  SET_PT_BOTH (pos, pos_byte);

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  if (shortage > 0
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      && (count <= 0
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	  || (ZV > BEGV
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	      && PT != opoint
	      && (FETCH_BYTE (PT_BYTE - 1) != '\n'))))
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    shortage--;
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  return make_number (count <= 0 ? - shortage : shortage);
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}

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DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line, 0, 1, "^p",
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       doc: /* Move point to beginning of current line (in the logical order).
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With argument N not nil or 1, move forward N - 1 lines first.
If point reaches the beginning or end of buffer, it stops there.

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This function constrains point to the current field unless this moves
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point to a different line than the original, unconstrained result.
If N is nil or 1, and a front-sticky field starts at point, the point
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does not move.  To ignore field boundaries bind
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`inhibit-field-text-motion' to t, or use the `forward-line' function
instead.  For instance, `(forward-line 0)' does the same thing as
`(beginning-of-line)', except that it ignores field boundaries.  */)
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  (Lisp_Object n)
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{
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  if (NILP (n))
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    XSETFASTINT (n, 1);
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  else
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    CHECK_NUMBER (n);
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  SET_PT (XINT (Fline_beginning_position (n)));
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  return Qnil;
}

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DEFUN ("end-of-line", Fend_of_line, Send_of_line, 0, 1, "^p",
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       doc: /* Move point to end of current line (in the logical order).
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With argument N not nil or 1, move forward N - 1 lines first.
If point reaches the beginning or end of buffer, it stops there.
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To ignore intangibility, bind `inhibit-point-motion-hooks' to t.
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This function constrains point to the current field unless this moves
point to a different line than the original, unconstrained result.  If
N is nil or 1, and a rear-sticky field ends at point, the point does
not move.  To ignore field boundaries bind `inhibit-field-text-motion'
to t.  */)
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  (Lisp_Object n)
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{
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  ptrdiff_t newpos;
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  if (NILP (n))
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    XSETFASTINT (n, 1);
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  else
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    CHECK_NUMBER (n);
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  while (1)
    {
      newpos = XINT (Fline_end_position (n));
      SET_PT (newpos);

      if (PT > newpos
	  && FETCH_CHAR (PT - 1) == '\n')
	{
	  /* If we skipped over a newline that follows
	     an invisible intangible run,
	     move back to the last tangible position
	     within the line.  */

	  SET_PT (PT - 1);
	  break;
	}
      else if (PT > newpos && PT < ZV
	       && FETCH_CHAR (PT) != '\n')
	/* If we skipped something intangible
	   and now we're not really at eol,
	   keep going.  */
	n = make_number (1);
      else
	break;
    }
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  return Qnil;
}

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static int nonundocount;

static void
remove_excessive_undo_boundaries (void)
{
  bool remove_boundary = true;

  if (!EQ (Vthis_command, KVAR (current_kboard, Vlast_command)))
    nonundocount = 0;

  if (NILP (Vexecuting_kbd_macro))
    {
      if (nonundocount <= 0 || nonundocount >= 20)
	{
	  remove_boundary = false;
	  nonundocount = 0;
	}
      nonundocount++;
    }

  if (remove_boundary
      && CONSP (BVAR (current_buffer, undo_list))
      && NILP (XCAR (BVAR (current_buffer, undo_list)))
      /* Only remove auto-added boundaries, not boundaries
	 added by explicit calls to undo-boundary.  */
      && EQ (BVAR (current_buffer, undo_list), last_undo_boundary))
    /* Remove the undo_boundary that was just pushed.  */
    bset_undo_list (current_buffer, XCDR (BVAR (current_buffer, undo_list)));
}

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DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "p\nP",
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       doc: /* Delete the following N characters (previous if N is negative).
Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
Interactively, N is the prefix arg, and KILLFLAG is set if
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N was explicitly specified.

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The command `delete-forward-char' is preferable for interactive use, e.g.
because it respects values of `delete-active-region' and `overwrite-mode'.  */)
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  (Lisp_Object n, Lisp_Object killflag)
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{
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  EMACS_INT pos;
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  CHECK_NUMBER (n);
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  if (abs (XINT (n)) < 2)
    remove_excessive_undo_boundaries ();

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  pos = PT + XINT (n);
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  if (NILP (killflag))
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    {
      if (XINT (n) < 0)
	{
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	  if (pos < BEGV)
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	    xsignal0 (Qbeginning_of_buffer);
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	  else
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	    del_range (pos, PT);
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	}
      else
	{
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	  if (pos > ZV)
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	    xsignal0 (Qend_of_buffer);
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	  else
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	    del_range (PT, pos);
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	}
    }
  else
    {
      call1 (Qkill_forward_chars, n);
    }
  return Qnil;
}

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/* Note that there's code in command_loop_1 which typically avoids
   calling this.  */
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DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "p",
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       doc: /* Insert the character you type.
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Whichever character you type to run this command is inserted.
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The numeric prefix argument N says how many times to repeat the insertion.
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Before insertion, `expand-abbrev' is executed if the inserted character does
not have word syntax and the previous character in the buffer does.
After insertion, the value of `auto-fill-function' is called if the
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`auto-fill-chars' table has a non-nil value for the inserted character.
At the end, it runs `post-self-insert-hook'.  */)
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  (Lisp_Object n)
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{
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  CHECK_NUMBER (n);

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  if (XFASTINT (n) < 0)
    error ("Negative repetition argument %"pI"d", XFASTINT (n));
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  if (XFASTINT (n) < 2)
    remove_excessive_undo_boundaries ();
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  /* Barf if the key that invoked this was not a character.  */
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  if (!CHARACTERP (last_command_event))
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    bitch_at_user ();
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  else {
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    int character = translate_char (Vtranslation_table_for_input,
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				    XINT (last_command_event));
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    int val = internal_self_insert (character, XFASTINT (n));
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    if (val == 2)
      nonundocount = 0;
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    frame_make_pointer_invisible (SELECTED_FRAME ());
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  }
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  return Qnil;
}

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/* Insert N times character C
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   If this insertion is suitable for direct output (completely simple),
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   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.  */
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static int
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internal_self_insert (int c, EMACS_INT n)
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{
  int hairy = 0;
  Lisp_Object tem;
  register enum syntaxcode synt;
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  Lisp_Object overwrite;
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  /* Length of multi-byte form of C.  */
  int len;
  /* Working buffer and pointer for multi-byte form of C.  */
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  unsigned char str[MAX_MULTIBYTE_LENGTH];
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  ptrdiff_t chars_to_delete = 0;
  ptrdiff_t spaces_to_insert = 0;
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  overwrite = BVAR (current_buffer, overwrite_mode);
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  if (!NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions))
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    hairy = 1;

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  /* At first, get multi-byte form of C in STR.  */
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  if (!NILP (BVAR (current_buffer, enable_multibyte_characters)))
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    {
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      len = CHAR_STRING (c, str);
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      if (len == 1)
	/* If C has modifier bits, this makes C an appropriate
           one-byte char.  */
	c = *str;
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    }
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  else
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    {
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      str[0] = SINGLE_BYTE_CHAR_P (c) ? c : CHAR_TO_BYTE8 (c);
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      len = 1;
    }
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  if (!NILP (overwrite)
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      && PT < ZV)
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    {
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      /* 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.  */

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      /* This is the character after point.  */
      int c2 = FETCH_CHAR (PT_BYTE);

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      int cwidth;

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      /* 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.  */
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      if (EQ (overwrite, Qoverwrite_mode_binary))
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	chars_to_delete = min (n, PTRDIFF_MAX);
      else if (c != '\n' && c2 != '\n'
	       && (cwidth = XFASTINT (Fchar_width (make_number (c)))) != 0)
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	{
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	  ptrdiff_t pos = PT;
	  ptrdiff_t pos_byte = PT_BYTE;
	  ptrdiff_t curcol = current_column ();
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	  if (n <= (min (MOST_POSITIVE_FIXNUM, PTRDIFF_MAX) - curcol) / cwidth)
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	    {
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	      /* Column the cursor should be placed at after this insertion.
		 The value should be calculated only when necessary.  */
	      ptrdiff_t target_clm = curcol + n * cwidth;

	      /* 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.  */
	      ptrdiff_t 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.  */
		  ptrdiff_t actual = PT_BYTE;
		  DEC_POS (actual);
		  if (FETCH_CHAR (actual) == '\t')
		    /* Rather than add spaces, let's just keep the tab. */
		    chars_to_delete--;
		  else
		    spaces_to_insert = actual_clm - target_clm;
		}

	      SET_PT_BOTH (pos, pos_byte);
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	    }
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	}
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      hairy = 2;
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    }
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  synt = SYNTAX (c);

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  if (!NILP (BVAR (current_buffer, abbrev_mode))
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      && synt != Sword
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      && NILP (BVAR (current_buffer, read_only))
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      && PT > BEGV
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      && (SYNTAX (!NILP (BVAR (current_buffer, enable_multibyte_characters))
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		  ? XFASTINT (Fprevious_char ())
		  : UNIBYTE_TO_CHAR (XFASTINT (Fprevious_char ())))
	  == Sword))
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    {
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      EMACS_INT modiff = MODIFF;
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      Lisp_Object sym;

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      sym = call0 (Qexpand_abbrev);
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      /* If we expanded an abbrev which has a hook,
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	 and the hook has a non-nil `no-self-insert' property,
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	 return right away--don't really self-insert.  */
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      if (SYMBOLP (sym) && ! NILP (sym)
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	  && ! NILP (XSYMBOL (sym)->function)
	  && SYMBOLP (XSYMBOL (sym)->function))
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	{
	  Lisp_Object prop;
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	  prop = Fget (XSYMBOL (sym)->function, intern ("no-self-insert"));
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	  if (! NILP (prop))
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	    return 1;
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	}

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      if (MODIFF != modiff)
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	hairy = 2;
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    }
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  if (chars_to_delete)
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    {
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      int mc = ((NILP (BVAR (current_buffer, enable_multibyte_characters))
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		 && SINGLE_BYTE_CHAR_P (c))
		? UNIBYTE_TO_CHAR (c) : c);
      Lisp_Object string = Fmake_string (make_number (n), make_number (mc));
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      if (spaces_to_insert)
	{
	  tem = Fmake_string (make_number (spaces_to_insert),
			      make_number (' '));
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	  string = concat2 (string, tem);
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	}

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      replace_range (PT, PT + chars_to_delete, string, 1, 1, 1);
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      Fforward_char (make_number (n));
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    }
  else if (n > 1)
    {
      USE_SAFE_ALLOCA;
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      char *strn, *p;
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      SAFE_NALLOCA (strn, len, n);
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      for (p = strn; n > 0; n--, p += len)
	memcpy (p, str, len);
      insert_and_inherit (strn, p - strn);
      SAFE_FREE ();
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    }
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  else if (n > 0)
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    insert_and_inherit ((char *) str, len);
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  if ((CHAR_TABLE_P (Vauto_fill_chars)
       ? !NILP (CHAR_TABLE_REF (Vauto_fill_chars, c))
       : (c == ' ' || c == '\n'))
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      && !NILP (BVAR (current_buffer, auto_fill_function)))
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    {
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      Lisp_Object auto_fill_result;
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      if (c == '\n')
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	/* 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);
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      auto_fill_result = call0 (BVAR (current_buffer, auto_fill_function));
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      /* Test PT < ZV in case the auto-fill-function is strange.  */
      if (c == '\n' && PT < ZV)
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	SET_PT_BOTH (PT + 1, PT_BYTE + 1);
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      if (!NILP (auto_fill_result))
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	hairy = 2;
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    }
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  /* Run hooks for electric keys.  */
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  run_hook (Qpost_self_insert_hook);
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  return hairy;
}

/* module initialization */

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void
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syms_of_cmds (void)
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{
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  DEFSYM (Qkill_backward_chars, "kill-backward-chars");
  DEFSYM (Qkill_forward_chars, "kill-forward-chars");
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  /* A possible value for a buffer's overwrite-mode variable.  */
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  DEFSYM (Qoverwrite_mode_binary, "overwrite-mode-binary");
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  DEFSYM (Qexpand_abbrev, "expand-abbrev");
  DEFSYM (Qpost_self_insert_hook, "post-self-insert-hook");
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  DEFVAR_LISP ("post-self-insert-hook", Vpost_self_insert_hook,
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	       doc: /* Hook run at the end of `self-insert-command'.
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This is run after inserting the character.  */);
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  Vpost_self_insert_hook = Qnil;
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  defsubr (&Sforward_point);
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  defsubr (&Sforward_char);
  defsubr (&Sbackward_char);
  defsubr (&Sforward_line);
  defsubr (&Sbeginning_of_line);
  defsubr (&Send_of_line);

  defsubr (&Sdelete_char);
  defsubr (&Sself_insert_command);
}

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void
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keys_of_cmds (void)
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{
  int n;

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  nonundocount = 0;
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  initial_define_key (global_map, Ctl ('I'), "self-insert-command");
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  for (n = 040; n < 0177; n++)
    initial_define_key (global_map, n, "self-insert-command");
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#ifdef MSDOS
  for (n = 0200; n < 0240; n++)
    initial_define_key (global_map, n, "self-insert-command");
#endif
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  for (n = 0240; n < 0400; n++)
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    initial_define_key (global_map, n, "self-insert-command");
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  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 ('E'), "end-of-line");
  initial_define_key (global_map, Ctl ('F'), "forward-char");
}