vi_mode.c

早期freebsd实现

	c = to_lower (rl_line_buffer[rl_point]);
      else if (lowercase_p (rl_line_buffer[rl_point]))
	c = to_upper (rl_line_buffer[rl_point]);

      /* Vi is kind of strange here. */
      if (c)
	{
	  rl_begin_undo_group ();
	  rl_delete (1, c);
	  rl_insert (1, c);
	  rl_end_undo_group ();
	  rl_vi_check ();
        }
      else
	rl_forward (1);
    }
}

rl_vi_put (count, key)
     int count, key;
{
  if (!uppercase_p (key) && (rl_point + 1 <= rl_end))
    rl_point++;

  rl_yank ();
  rl_backward (1);
}

rl_vi_check ()
{
  if (rl_point && rl_point == rl_end)
    rl_point--;
}

rl_vi_column (count)
{
  if (count > rl_end)
    rl_end_of_line ();
  else
    rl_point = count - 1;
}

int
rl_vi_domove (key, nextkey)
     int key, *nextkey;
{
  int c, save;
  int old_end, added_blank;

  added_blank = 0;

  rl_mark = rl_point;
  c = rl_read_key ();
  *nextkey = c;

  if (!member (c, vi_motion))
    {
      if (digit (c))
	{
	  save = rl_numeric_arg;
	  rl_numeric_arg = digit_value (c);
	  rl_digit_loop1 ();
	  rl_numeric_arg *= save;
	  c = rl_read_key ();	/* real command */
	  *nextkey = c;
	}
      else if ((key == 'd' && c == 'd') ||
	       (key == 'y' && c == 'y') ||
	       (key == 'c' && c == 'c'))
	{
	  rl_mark = rl_end;
	  rl_beg_of_line ();
	  return (0);
	}
      else
	return (-1);
    }

  /* Append a blank character temporarily so that the motion routines
     work right at the end of the line. */
  old_end = rl_end;
  rl_line_buffer[rl_end++] = ' ';	/* This looks pretty bogus to me??? */
  rl_line_buffer[rl_end] = '\0';
  added_blank++;

  rl_dispatch (c, keymap);

  /* Remove the blank that we added. */
  rl_end = old_end;
  rl_line_buffer[rl_end] = '\0';
  if (rl_point > rl_end)
    rl_point = rl_end - 1;

  /* No change in position means the command failed. */
  if (rl_mark == rl_point)
    return (-1);

  /* rl_vi_f[wW]ord () leaves the cursor on the first character of the next
     word.  If we are not at the end of the line, and we are on a
     non-whitespace character, move back one (presumably to whitespace). */
  if ((c == 'w' || c == 'W') && (rl_point < rl_end) &&
      !whitespace (rl_line_buffer[rl_point]))
    rl_point--;

  /* If cw or cW, back up to the end of a word, so the behaviour of ce
     or cE is the actual result.  Brute-force, no subtlety.  Do the same
     thing for dw or dW. */
  if (key == 'c' && (to_upper (c) == 'W'))
    {
      while (rl_point && whitespace (rl_line_buffer[rl_point]))
	rl_point--;
    }

  if (rl_mark < rl_point)
    exchange (rl_point, rl_mark);

  return (0);
}

/* A simplified loop for vi. Don't dispatch key at end.
   Don't recognize minus sign? */
rl_digit_loop1 ()
{
  int key, c;

  while (1)
    {
      rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg, 0);
      key = c = rl_read_key ();

      if (keymap[c].type == ISFUNC &&
	  keymap[c].function == rl_universal_argument)
	{
	  rl_numeric_arg *= 4;
	  continue;
	}

      c = UNMETA (c);
      if (numeric (c))
	{
	  if (rl_explicit_arg)
	    rl_numeric_arg = (rl_numeric_arg * 10) + digit_value (c);
	  else
	    rl_numeric_arg = digit_value (c);
	  rl_explicit_arg = 1;
	}
      else
	{
	  rl_clear_message ();
	  rl_stuff_char (key);
	  break;
	}
    }
}

rl_vi_delete_to (count, key)
     int count, key;
{
  int c;

  if (uppercase_p (key))
    rl_stuff_char ('$');

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return;
    }

  if ((c != 'l') && (c != '|') && (c != 'h') && rl_mark < rl_end)
    rl_mark++;

  rl_kill_text (rl_point, rl_mark);
}

rl_vi_change_to (count, key)
     int count, key;
{
  int c;

  if (uppercase_p (key))
    rl_stuff_char ('$');

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return;
    }

  if ((c != 'l') && (c != '|') && (c != 'h') && rl_mark < rl_end)
    rl_mark++;

  rl_begin_undo_group ();
  vi_doing_insert = 1;
  rl_kill_text (rl_point, rl_mark);
  rl_vi_insertion_mode ();
}

rl_vi_yank_to (count, key)
     int count, key;
{
  int c, save = rl_point;

  if (uppercase_p (key))
    rl_stuff_char ('$');

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return;
    }

  if ((c != 'l') && (c != '|') && (c != 'h') && rl_mark < rl_end)
    rl_mark++;

  rl_begin_undo_group ();
  rl_kill_text (rl_point, rl_mark);
  rl_end_undo_group ();
  rl_do_undo ();
  rl_point = save;
}

rl_vi_delete (count)
{
  int end;

  if (rl_end == 0)
    {
      ding ();
      return;
    }

  end = rl_point + count;

  if (end >= rl_end)
    end = rl_end;

  rl_kill_text (rl_point, end);
  
  if (rl_point > 0 && rl_point == rl_end)
    rl_backward (1);
}

/* Turn the current line into a comment in shell history.
   A K*rn shell style function. */
rl_vi_comment ()
{
  rl_beg_of_line ();

  if (rl_vi_comment_begin != (char *)NULL)
    rl_insert_text (rl_vi_comment_begin);
  else
    rl_insert_text (": ");	/* Default. */

  rl_redisplay ();
  rl_newline (1, '\010');
}

rl_vi_first_print ()
{
  rl_back_to_indent (0, 0);
}

rl_back_to_indent (ignore1, ignore2)
     int ignore1, ignore2;
{
  rl_beg_of_line ();
  while (rl_point < rl_end && whitespace (rl_line_buffer[rl_point]))
    rl_point++;
}

/* NOTE: it is necessary that opposite directions are inverses */
#define	FTO	 1		/* forward to */
#define BTO	-1		/* backward to */
#define FFIND	 2		/* forward find */
#define BFIND	-2		/* backward find */

rl_vi_char_search (count, key)
     int count, key;
{
  static char target;
  static int orig_dir, dir;
  int pos;

  if (key == ';' || key == ',')
    dir = (key == ';' ? orig_dir : -orig_dir);
  else
    {
      target = rl_getc (rl_instream);

      switch (key)
        {
        case 't':
          orig_dir = dir = FTO;
          break;

        case 'T':
          orig_dir = dir = BTO;
          break;

        case 'f':
          orig_dir = dir = FFIND;
          break;

        case 'F':
          orig_dir = dir = BFIND;
          break;
        }
    }

  pos = rl_point;

  while (count--)
    {
      if (dir < 0)
	{
	  if (pos == 0)
	    {
	      ding ();
	      return;
	    }

	  pos--;
	  do
	    {
	      if (rl_line_buffer[pos] == target)
		{
		  if (dir == BTO)
		    rl_point = pos + 1;
		  else
		    rl_point = pos;
		  break;
		}
	    }
	  while (pos--);

	  if (pos < 0)
	    {
	      ding ();
	      return;
	    }
	}
      else
	{			/* dir > 0 */
	  if (pos >= rl_end)
	    {
	      ding ();
	      return;
	    }

	  pos++;
	  do
	    {
	      if (rl_line_buffer[pos] == target)
		{
		  if (dir == FTO)
		    rl_point = pos - 1;
		  else
		    rl_point = pos;
		  break;
		}
	    }
	  while (++pos < rl_end);

	  if (pos >= (rl_end - 1))
	    {
	      ding ();
	      return;
	    }
	}
    }
}

/* Match brackets */
rl_vi_match ()
{
  int count = 1, brack, pos;

  pos = rl_point;
  if ((brack = rl_vi_bracktype (rl_line_buffer[rl_point])) == 0)
    {
      while ((brack = rl_vi_bracktype (rl_line_buffer[rl_point])) == 0 &&
	     rl_point < rl_end - 1)
	rl_forward (1);

      if (brack <= 0)
	{
	  rl_point = pos;
	  ding ();
	  return;
	}
    }

  pos = rl_point;

  if (brack < 0)
    {
      while (count)
	{
	  if (--pos >= 0)
	    {
	      int b = rl_vi_bracktype (rl_line_buffer[pos]);
	      if (b == -brack)
		count--;
	      else if (b == brack)
		count++;
	    }
	  else
	    {
	      ding ();
	      return;
	    }
	}
    }
  else
    {			/* brack > 0 */
      while (count)
	{
	  if (++pos < rl_end)
	    {
	      int b = rl_vi_bracktype (rl_line_buffer[pos]);
	      if (b == -brack)
		count--;
	      else if (b == brack)
		count++;
	    }
	  else
	    {
	      ding ();
	      return;
	    }
	}
    }
  rl_point = pos;
}

int
rl_vi_bracktype (c)
     int c;
{
  switch (c)
    {
    case '(': return  1;
    case ')': return -1;
    case '[': return  2;
    case ']': return -2;
    case '{': return  3;
    case '}': return -3;
    default:  return  0;
    }
}

rl_vi_change_char (count, key)
     int count, key;
{
  int c;

  c = rl_getc (rl_instream);

  if (c == '\033' || c == CTRL ('C'))
    return;

  while (count-- && rl_point < rl_end)
    {
      rl_begin_undo_group ();

      rl_delete (1, c);
      rl_insert (1, c);
      if (count == 0)
	rl_backward (1);

      rl_end_undo_group ();
    }
}

rl_vi_subst (count, key)
     int count, key;
{
  rl_begin_undo_group ();
  vi_doing_insert = 1;

  if (uppercase_p (key))
    {
      rl_beg_of_line ();
      rl_kill_line (1);
    }
  else
    rl_delete (count, key);

  rl_end_undo_group ();
  rl_vi_insertion_mode ();
}

rl_vi_overstrike (count, key)
     int count, key;
{
  int i;

  if (vi_doing_insert == 0)
    {
      vi_doing_insert = 1;
      rl_begin_undo_group ();
    }

  for (i = 0; i < count; i++)
    {
      vi_replace_count++;
      rl_begin_undo_group ();

      if (rl_point < rl_end)
	{
	  rl_delete (1, key);
	  rl_insert (1, key);
	}
      else
	rl_insert (1, key);

      rl_end_undo_group ();
    }
}

rl_vi_overstrike_delete (count)
     int count;
{
  int i, s;

  for (i = 0; i < count; i++)
    {
      if (vi_replace_count == 0)
	{
	  ding ();
	  break;
	}
      s = rl_point;

      if (rl_do_undo ())
	vi_replace_count--;

      if (rl_point == s)
	rl_backward (1);
    }

  if (vi_replace_count == 0 && vi_doing_insert)
    {
      rl_end_undo_group ();
      rl_do_undo ();
      vi_doing_insert = 0;
    }
}

rl_vi_replace (count, key)
     int count, key;
{
  int i;

  vi_replace_count = 0;

  if (!vi_replace_map)
    {
      vi_replace_map = rl_make_bare_keymap ();

      for (i = ' '; i < 127; i++)
	vi_replace_map[i].function = rl_vi_overstrike;

      vi_replace_map[RUBOUT].function = rl_vi_overstrike_delete;
      vi_replace_map[ESC].function = rl_vi_movement_mode;
      vi_replace_map[RETURN].function = rl_newline;
      vi_replace_map[NEWLINE].function = rl_newline;

      /* If the normal vi insertion keymap has ^H bound to erase, do the
         same here.  Probably should remove the assignment to RUBOUT up
         there, but I don't think it will make a difference in real life. */
      if (vi_insertion_keymap[CTRL ('H')].type == ISFUNC &&
	  vi_insertion_keymap[CTRL ('H')].function == rl_rubout)
	vi_replace_map[CTRL ('H')].function = rl_vi_overstrike_delete;

    }
  keymap = vi_replace_map;
}

/*
 * Try to complete the word we are standing on or the word that ends with
 * the previous character. A space matches everything.
 * Word delimiters are space and ;.
 */
rl_vi_possible_completions()
{
  int save_pos = rl_point;

  if (!index (" ;", rl_line_buffer[rl_point]))
    {
      while (!index(" ;", rl_line_buffer[++rl_point]))
	;
    }
  else if (rl_line_buffer[rl_point-1] == ';')
    {
      ding ();
      return (0);
    }

  rl_possible_completions ();
  rl_point = save_pos;

  return (0);
}

#endif /* VI_MODE */