/* vi_mode.c -- A vi emulation mode for Bash.
   Derived from code written by Jeff Sparkes (jsparkes@bnr.ca).  */

/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline Library 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.

   The GNU Readline Library 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.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY

/* **************************************************************** */
/*								    */
/*			VI Emulation Mode			    */
/*								    */
/* **************************************************************** */
#include "rlconf.h"

#if defined (VI_MODE)

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <sys/types.h>

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#include <stdio.h>

/* Some standard library routines. */
#include "rldefs.h"
#include "readline.h"
#include "history.h"

#ifndef _rl_digit_p
#define _rl_digit_p(c)  ((c) >= '0' && (c) <= '9')
#endif

#ifndef _rl_digit_value
#define _rl_digit_value(c) ((c) - '0')
#endif

#ifndef member
#define member(c, s) ((c) ? (char *)strchr ((s), (c)) != (char *)NULL : 0)
#endif

#ifndef isident
#define isident(c) ((_rl_pure_alphabetic (c) || _rl_digit_p (c) || c == '_'))
#endif

#ifndef exchange
#define exchange(x, y) do {int temp = x; x = y; y = temp;} while (0)
#endif

extern char *xmalloc (), *xrealloc ();

/* Variables imported from readline.c */
extern int rl_point, rl_end, rl_mark;
extern FILE *rl_instream;
extern int rl_line_buffer_len, rl_explicit_arg, rl_numeric_arg;
extern Keymap _rl_keymap;
extern char *rl_prompt;
extern char *rl_line_buffer;
extern int rl_arg_sign;

extern int _rl_doing_an_undo;
extern int _rl_undo_group_level;

extern void _rl_dispatch ();
extern int _rl_char_search_internal ();

extern void rl_extend_line_buffer ();
extern int rl_vi_check ();

/* Non-zero means enter insertion mode. */
static int _rl_vi_doing_insert;

/* Command keys which do movement for xxx_to commands. */
static const char *vi_motion = " hl^$0ftFt;,%wbeWBE|";

/* Keymap used for vi replace characters.  Created dynamically since
   rarely used. */
static Keymap vi_replace_map;

/* The number of characters inserted in the last replace operation. */
static int vi_replace_count;

/* If non-zero, we have text inserted after a c[motion] command that put
   us implicitly into insert mode.  Some people want this text to be
   attached to the command so that it is `redoable' with `.'. */
static int vi_continued_command;
static char *vi_insert_buffer;
static int vi_insert_buffer_size;

static int _rl_vi_last_command = 'i';	/* default `.' puts you in insert mode */
static int _rl_vi_last_repeat = 1;
static int _rl_vi_last_arg_sign = 1;
static int _rl_vi_last_motion;
static int _rl_vi_last_search_char;
static int _rl_vi_last_replacement;

static int _rl_vi_last_key_before_insert;

static int vi_redoing;

/* Text modification commands.  These are the `redoable' commands. */
static const char *vi_textmod = "_*\\AaIiCcDdPpYyRrSsXx~";

/* Arrays for the saved marks. */
static int vi_mark_chars[27];

static int rl_digit_loop1 ();

void
_rl_vi_initialize_line ()
{
#ifndef __QNXNTO__
  register uint i;
#else
  register unsigned int i;
#endif

  for (i = 0; i < (int) sizeof (vi_mark_chars) / sizeof (int); i++)
    vi_mark_chars[i] = -1;
}

void
_rl_vi_reset_last ()
{
  _rl_vi_last_command = 'i';
  _rl_vi_last_repeat = 1;
  _rl_vi_last_arg_sign = 1;
  _rl_vi_last_motion = 0;
}

void
_rl_vi_set_last (key, repeat, sign)
     int key, repeat, sign;
{
  _rl_vi_last_command = key;
  _rl_vi_last_repeat = repeat;
  _rl_vi_last_arg_sign = sign;
}

/* Is the command C a VI mode text modification command? */
int
_rl_vi_textmod_command (c)
     int c;
{
  return (member (c, vi_textmod));
}

static void
_rl_vi_stuff_insert (count)
     int count;
{
  rl_begin_undo_group ();
  while (count--)
    rl_insert_text (vi_insert_buffer);
  rl_end_undo_group ();
}

/* Bound to `.'.  Called from command mode, so we know that we have to
   redo a text modification command.  The default for _rl_vi_last_command
   puts you back into insert mode. */
int
rl_vi_redo (count, c)
     int count, c __attribute__((unused));
{
  if (!rl_explicit_arg)
    {
      rl_numeric_arg = _rl_vi_last_repeat;
      rl_arg_sign = _rl_vi_last_arg_sign;
    }

  vi_redoing = 1;
  /* If we're redoing an insert with `i', stuff in the inserted text
     and do not go into insertion mode. */
  if (_rl_vi_last_command == 'i' && vi_insert_buffer && *vi_insert_buffer)
    {
      _rl_vi_stuff_insert (count);
      /* And back up point over the last character inserted. */
      if (rl_point > 0)
	rl_point--;
    }
  else
    _rl_dispatch (_rl_vi_last_command, _rl_keymap);
  vi_redoing = 0;

  return (0);
}

/* A placeholder for further expansion. */
int
rl_vi_undo (count, key)
     int count, key;
{
  return (rl_undo_command (count, key));
}

/* Yank the nth arg from the previous line into this line at point. */
int
rl_vi_yank_arg (count, key) 
     int count, key __attribute__((unused));
{
  /* Readline thinks that the first word on a line is the 0th, while vi
     thinks the first word on a line is the 1st.  Compensate. */
  if (rl_explicit_arg)
    rl_yank_nth_arg (count - 1, 0);
  else
    rl_yank_nth_arg ('$', 0);

  return (0);
}

/* With an argument, move back that many history lines, else move to the
   beginning of history. */
int
rl_vi_fetch_history (count, c)
     int count, c;
{
  int wanted;

  /* Giving an argument of n means we want the nth command in the history
     file.  The command number is interpreted the same way that the bash
     `history' command does it -- that is, giving an argument count of 450
     to this command would get the command listed as number 450 in the
     output of `history'. */
  if (rl_explicit_arg)
    {
      wanted = history_base + where_history () - count;
      if (wanted <= 0)
        rl_beginning_of_history (0, 0);
      else
        rl_get_previous_history (wanted, c);
    }
  else
    rl_beginning_of_history (count, 0);
  return (0);
}

/* Search again for the last thing searched for. */
int
rl_vi_search_again (count, key)
     int count, key;
{
  switch (key)
    {
    case 'n':
      rl_noninc_reverse_search_again (count, key);
      break;

    case 'N':
      rl_noninc_forward_search_again (count, key);
      break;
    }
  return (0);
}

/* Do a vi style search. */
int
rl_vi_search (count, key)
     int count, key;
{
  switch (key)
    {
    case '?':
      rl_noninc_forward_search (count, key);
      break;

    case '/':
      rl_noninc_reverse_search (count, key);
      break;

    default:
      ding ();
      break;
    }
  return (0);
}

/* Completion, from vi's point of view. */
int
rl_vi_complete (ignore, key)
     int ignore __attribute__((unused)), key;
{
  if ((rl_point < rl_end) && (!whitespace (rl_line_buffer[rl_point])))
    {
      if (!whitespace (rl_line_buffer[rl_point + 1]))
	rl_vi_end_word (1, 'E');
      rl_point++;
    }

  if (key == '*')
    rl_complete_internal ('*');	/* Expansion and replacement. */
  else if (key == '=')
    rl_complete_internal ('?');	/* List possible completions. */
  else if (key == '\\')
    rl_complete_internal (TAB);	/* Standard Readline completion. */
  else
    rl_complete (0, key);

  if (key == '*' || key == '\\')
    {
      _rl_vi_set_last (key, 1, rl_arg_sign);
      rl_vi_insertion_mode (1, key);
    }
  return (0);
}

/* Tilde expansion for vi mode. */
int
rl_vi_tilde_expand (ignore, key)
     int ignore __attribute__((unused)), key;
{
  rl_tilde_expand (0, key);
  _rl_vi_set_last (key, 1, rl_arg_sign);	/* XXX */
  rl_vi_insertion_mode (1, key);
  return (0);
}

/* Previous word in vi mode. */
int
rl_vi_prev_word (count, key)
     int count, key;
{
  if (count < 0)
    return (rl_vi_next_word (-count, key));

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

  if (_rl_uppercase_p (key))
    rl_vi_bWord (count, key);
  else
    rl_vi_bword (count, key);

  return (0);
}

/* Next word in vi mode. */
int
rl_vi_next_word (count, key)
     int count, key;
{
  if (count < 0)
    return (rl_vi_prev_word (-count, key));

  if (rl_point >= (rl_end - 1))
    {
      ding ();
      return (0);
    }

  if (_rl_uppercase_p (key))
    rl_vi_fWord (count, key);
  else
    rl_vi_fword (count, key);
  return (0);
}

/* Move to the end of the ?next? word. */
int
rl_vi_end_word (count, key)
     int count, key;
{
  if (count < 0)
    {
      ding ();
      return -1;
    }

  if (_rl_uppercase_p (key))
    rl_vi_eWord (count, key);
  else
    rl_vi_eword (count, key);
  return (0);
}

/* Move forward a word the way that 'W' does. */
int
rl_vi_fWord (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point < (rl_end - 1))
    {
      /* Skip until whitespace. */
      while (!whitespace (rl_line_buffer[rl_point]) && rl_point < rl_end)
	rl_point++;

      /* Now skip whitespace. */
      while (whitespace (rl_line_buffer[rl_point]) && rl_point < rl_end)
	rl_point++;
    }
  return (0);
}

int
rl_vi_bWord (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point > 0)
    {
      /* If we are at the start of a word, move back to whitespace so
	 we will go back to the start of the previous word. */
      if (!whitespace (rl_line_buffer[rl_point]) &&
	  whitespace (rl_line_buffer[rl_point - 1]))
	rl_point--;

      while (rl_point > 0 && whitespace (rl_line_buffer[rl_point]))
	rl_point--;

      if (rl_point > 0)
	{
	  while (--rl_point >= 0 && !whitespace (rl_line_buffer[rl_point]));
	  rl_point++;
	}
    }
  return (0);
}

int
rl_vi_eWord (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point < (rl_end - 1))
    {
      if (!whitespace (rl_line_buffer[rl_point]))
	rl_point++;

      /* Move to the next non-whitespace character (to the start of the
	 next word). */
      while (++rl_point < rl_end && whitespace (rl_line_buffer[rl_point]));

      if (rl_point && rl_point < rl_end)
	{
	  /* Skip whitespace. */
	  while (rl_point < rl_end && whitespace (rl_line_buffer[rl_point]))
	    rl_point++;

	  /* Skip until whitespace. */
	  while (rl_point < rl_end && !whitespace (rl_line_buffer[rl_point]))
	    rl_point++;

	  /* Move back to the last character of the word. */
	  rl_point--;
	}
    }
  return (0);
}

int
rl_vi_fword (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point < (rl_end - 1))
    {
      /* Move to white space (really non-identifer). */
      if (isident (rl_line_buffer[rl_point]))
	{
	  while (isident (rl_line_buffer[rl_point]) && rl_point < rl_end)
	    rl_point++;
	}
      else /* if (!whitespace (rl_line_buffer[rl_point])) */
	{
	  while (!isident (rl_line_buffer[rl_point]) &&
		 !whitespace (rl_line_buffer[rl_point]) && rl_point < rl_end)
	    rl_point++;
	}

      /* Move past whitespace. */
      while (whitespace (rl_line_buffer[rl_point]) && rl_point < rl_end)
	rl_point++;
    }
  return (0);
}

int
rl_vi_bword (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point > 0)
    {
      int last_is_ident;

      /* If we are at the start of a word, move back to whitespace
	 so we will go back to the start of the previous word. */
      if (!whitespace (rl_line_buffer[rl_point]) &&
	  whitespace (rl_line_buffer[rl_point - 1]))
	rl_point--;

      /* If this character and the previous character are `opposite', move
	 back so we don't get messed up by the rl_point++ down there in
	 the while loop.  Without this code, words like `l;' screw up the
	 function. */
      last_is_ident = isident (rl_line_buffer[rl_point - 1]);
      if ((isident (rl_line_buffer[rl_point]) && !last_is_ident) ||
	  (!isident (rl_line_buffer[rl_point]) && last_is_ident))
	rl_point--;

      while (rl_point > 0 && whitespace (rl_line_buffer[rl_point]))
	rl_point--;

      if (rl_point > 0)
	{
	  if (isident (rl_line_buffer[rl_point]))
	    while (--rl_point >= 0 && isident (rl_line_buffer[rl_point]));
	  else
	    while (--rl_point >= 0 && !isident (rl_line_buffer[rl_point]) &&
		   !whitespace (rl_line_buffer[rl_point]));
	  rl_point++;
	}
    }
  return (0);
}

int
rl_vi_eword (count, ignore)
     int count, ignore __attribute__((unused));
{
  while (count-- && rl_point < rl_end - 1)
    {
      if (!whitespace (rl_line_buffer[rl_point]))
	rl_point++;

      while (rl_point < rl_end && whitespace (rl_line_buffer[rl_point]))
	rl_point++;

      if (rl_point < rl_end)
	{
	  if (isident (rl_line_buffer[rl_point]))
	    while (++rl_point < rl_end && isident (rl_line_buffer[rl_point]));
	  else
	    while (++rl_point < rl_end && !isident (rl_line_buffer[rl_point])
		   && !whitespace (rl_line_buffer[rl_point]));
	}
      rl_point--;
    }
  return (0);
}

int
rl_vi_insert_beg (count, key)
     int count __attribute__((unused)), key;
{
  rl_beg_of_line (1, key);
  rl_vi_insertion_mode (1, key);
  return (0);
}

int
rl_vi_append_mode (count, key)
     int count __attribute__((unused)), key;
{
  if (rl_point < rl_end)
    rl_point++;
  rl_vi_insertion_mode (1, key);
  return (0);
}

int
rl_vi_append_eol (count, key)
     int count __attribute__((unused)), key;
{
  rl_end_of_line (1, key);
  rl_vi_append_mode (1, key);
  return (0);
}

/* What to do in the case of C-d. */
int
rl_vi_eof_maybe (count, c)
     int count __attribute__((unused)), c __attribute__((unused));
{
  return (rl_newline (1, '\n'));
}

/* Insertion mode stuff. */

/* Switching from one mode to the other really just involves
   switching keymaps. */
int
rl_vi_insertion_mode (count, key)
     int count __attribute__((unused)), key;
{
  _rl_keymap = vi_insertion_keymap;
  _rl_vi_last_key_before_insert = key;
  return (0);
}

static void
_rl_vi_save_insert (up)
      UNDO_LIST *up;
{
  int len, start, end;

  if (up == 0)
    {
      if (vi_insert_buffer_size >= 1)
	vi_insert_buffer[0] = '\0';
      return;
    }

  start = up->start;
  end = up->end;
  len = end - start + 1;
  if (len >= vi_insert_buffer_size)
    {
      vi_insert_buffer_size += (len + 32) - (len % 32);
      vi_insert_buffer = xrealloc (vi_insert_buffer, vi_insert_buffer_size);
    }
  strncpy (vi_insert_buffer, rl_line_buffer + start, len - 1);
  vi_insert_buffer[len-1] = '\0';
}

void
_rl_vi_done_inserting ()
{
  if (_rl_vi_doing_insert)
    {
      rl_end_undo_group ();
      /* Now, the text between rl_undo_list->next->start and
	 rl_undo_list->next->end is what was inserted while in insert
	 mode.  It gets copied to VI_INSERT_BUFFER because it depends
	 on absolute indices into the line which may change (though they
	 probably will not). */
      _rl_vi_doing_insert = 0;
      _rl_vi_save_insert (rl_undo_list->next);
      vi_continued_command = 1;
    }
  else
    {
      if (_rl_vi_last_key_before_insert == 'i' && rl_undo_list)
        _rl_vi_save_insert (rl_undo_list);
      /* XXX - Other keys probably need to be checked. */
      else if (_rl_vi_last_key_before_insert == 'C')
	rl_end_undo_group ();
      while (_rl_undo_group_level > 0)
	rl_end_undo_group ();
      vi_continued_command = 0;
    }
}

int
rl_vi_movement_mode (count, key)
     int count __attribute__((unused)), key;
{
  if (rl_point > 0)
    rl_backward (1, key);

  _rl_keymap = vi_movement_keymap;
  _rl_vi_done_inserting ();
  return (0);
}

int
rl_vi_arg_digit (count, c)
     int count, c;
{
  if (c == '0' && rl_numeric_arg == 1 && !rl_explicit_arg)
    return (rl_beg_of_line (1, c));
  else
    return (rl_digit_argument (count, c));
}

int
rl_vi_change_case (count, ignore)
     int count, ignore __attribute__((unused));
{
  char c = 0;

  /* Don't try this on an empty line. */
  if (rl_point >= rl_end)
    return (0);

  while (count-- && rl_point < rl_end)
    {
      if (_rl_uppercase_p (rl_line_buffer[rl_point]))
	c = _rl_to_lower (rl_line_buffer[rl_point]);
      else if (_rl_lowercase_p (rl_line_buffer[rl_point]))
	c = _rl_to_upper (rl_line_buffer[rl_point]);
      else
	{
	  /* Just skip over characters neither upper nor lower case. */
	  rl_forward (1, c);
	  continue;
	}

      /* 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, c);
    }
  return (0);
}

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

  rl_yank (1, key);
  rl_backward (1, key);
  return (0);
}

int
rl_vi_check ()
{
  if (rl_point && rl_point == rl_end)
    rl_point--;
  return (0);
}

int
rl_vi_column (count, key)
     int count, key;
{
  if (count > rl_end)
    rl_end_of_line (1, key);
  else
    rl_point = count - 1;
  return (0);
}

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

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

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

  _rl_vi_last_motion = c;

  /* 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++] = ' ';
  rl_line_buffer[rl_end] = '\0';

  _rl_dispatch (c, _rl_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;

  /* 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 ((_rl_to_upper (c) == 'W') && rl_point < rl_end && rl_point > rl_mark &&
      !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. */
  if (key == 'c' && rl_point >= rl_mark && (_rl_to_upper (c) == 'W'))
    {
      /* Don't move farther back than where we started. */
      while (rl_point > rl_mark && whitespace (rl_line_buffer[rl_point]))
	rl_point--;

      /* Posix.2 says that if cw or cW moves the cursor towards the end of
	 the line, the character under the cursor should be deleted. */
      if (rl_point == rl_mark)
        rl_point++;
      else
	{
	  /* Move past the end of the word so that the kill doesn't
	     remove the last letter of the previous word.  Only do this
	     if we are not at the end of the line. */
	  if (rl_point >= 0 && rl_point < (rl_end - 1) && !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? */
static int
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 (_rl_keymap[c].type == ISFUNC &&
	  _rl_keymap[c].function == rl_universal_argument)
	{
	  rl_numeric_arg *= 4;
	  continue;
	}

      c = UNMETA (c);
      if (_rl_digit_p (c))
	{
	  if (rl_explicit_arg)
	    rl_numeric_arg = (rl_numeric_arg * 10) + _rl_digit_value (c);
	  else
	    rl_numeric_arg = _rl_digit_value (c);
	  rl_explicit_arg = 1;
	}
      else
	{
	  rl_clear_message ();
	  rl_stuff_char (key);
	  break;
	}
    }
  return (0);
}

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

  if (_rl_uppercase_p (key))
    rl_stuff_char ('$');
  else if (vi_redoing)
    rl_stuff_char (_rl_vi_last_motion);

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return -1;
    }

  /* These are the motion commands that do not require adjusting the
     mark. */
  if ((strchr (" l|h^0bB", c) == 0) && (rl_mark < rl_end))
    rl_mark++;

  rl_kill_text (rl_point, rl_mark);
  return (0);
}

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

  if (_rl_uppercase_p (key))
    rl_stuff_char ('$');
  else if (vi_redoing)
    rl_stuff_char (_rl_vi_last_motion);

  start_pos = rl_point;

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return -1;
    }

  /* These are the motion commands that do not require adjusting the
     mark.  c[wW] are handled by special-case code in rl_vi_domove(),
     and already leave the mark at the correct location. */
  if ((strchr (" l|hwW^0bB", c) == 0) && (rl_mark < rl_end))
    rl_mark++;

  /* The cursor never moves with c[wW]. */
  if ((_rl_to_upper (c) == 'W') && rl_point < start_pos)
    rl_point = start_pos;

  if (vi_redoing)
    {
      if (vi_insert_buffer && *vi_insert_buffer)
	rl_begin_undo_group ();
      rl_delete_text (rl_point, rl_mark);
      if (vi_insert_buffer && *vi_insert_buffer)
	{
	  rl_insert_text (vi_insert_buffer);
	  rl_end_undo_group ();
	}
    }
  else
    {
      rl_begin_undo_group ();		/* to make the `u' command work */
      rl_kill_text (rl_point, rl_mark);
      /* `C' does not save the text inserted for undoing or redoing. */
      if (_rl_uppercase_p (key) == 0)
        _rl_vi_doing_insert = 1;
      _rl_vi_set_last (key, count, rl_arg_sign);
      rl_vi_insertion_mode (1, key);
    }

  return (0);
}

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

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

  if (rl_vi_domove (key, &c))
    {
      ding ();
      return -1;
    }

  /* These are the motion commands that do not require adjusting the
     mark. */
  if ((strchr (" l|h^0%bB", c) == 0) && (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;

  return (0);
}

int
rl_vi_delete (count, key)
     int count, key;
{
  int end;

  if (rl_end == 0)
    {
      ding ();
      return -1;
    }

  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, key);
  return (0);
}

int
rl_vi_back_to_indent (count, key)
     int count __attribute__((unused)), key;
{
  rl_beg_of_line (1, key);
  while (rl_point < rl_end && whitespace (rl_line_buffer[rl_point]))
    rl_point++;
  return (0);
}

int
rl_vi_first_print (count, key)
     int count __attribute__((unused)), key;
{
  return (rl_vi_back_to_indent (1, key));
}

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

  if (key == ';' || key == ',')
    dir = key == ';' ? orig_dir : -orig_dir;
  else
    {
      if (vi_redoing)
	target = _rl_vi_last_search_char;
      else
	_rl_vi_last_search_char = 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;
        }
    }

  return (_rl_char_search_internal (count, dir, target));
}

/* Match brackets */
int
rl_vi_match (ignore, key)
     int ignore __attribute__((unused)), key;
{
  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, key);

      if (brack <= 0)
	{
	  rl_point = pos;
	  ding ();
	  return -1;
	}
    }

  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 -1;
	    }
	}
    }
  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 -1;
	    }
	}
    }
  rl_point = pos;
  return (0);
}

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;
    }
}

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

  if (vi_redoing)
    c = _rl_vi_last_replacement;
  else
    _rl_vi_last_replacement = c = rl_getc (rl_instream);

  if (c == '\033' || c == CTRL ('C'))
    return -1;

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

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

      rl_end_undo_group ();
    }
  return (0);
}

int
rl_vi_subst (count, key)
     int count, key;
{
  rl_begin_undo_group ();

  if (_rl_uppercase_p (key))
    {
      rl_beg_of_line (1, key);
      rl_kill_line (1, key);
    }
  else
    rl_delete_text (rl_point, rl_point+count);

  rl_end_undo_group ();

  _rl_vi_set_last (key, count, rl_arg_sign);

  if (vi_redoing)
    {
      int o = _rl_doing_an_undo;

      _rl_doing_an_undo = 1;
      if (vi_insert_buffer && *vi_insert_buffer)
	rl_insert_text (vi_insert_buffer);
      _rl_doing_an_undo = o;
    }
  else
    {
      rl_begin_undo_group ();
      _rl_vi_doing_insert = 1;
      rl_vi_insertion_mode (1, key);
    }

  return (0);
}

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

  if (_rl_vi_doing_insert == 0)
    {
      _rl_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 ();
    }
  return (0);
}

int
rl_vi_overstrike_delete (count, key)
     int count, key;
{
  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, key);
    }

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

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

  vi_replace_count = 0;

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

      for (i = ' '; i < KEYMAP_SIZE; 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;

    }
  _rl_keymap = vi_replace_map;
  return (0);
}

#if 0
/* 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 ;. */
int
rl_vi_possible_completions()
{
  int save_pos = rl_point;

  if (rl_line_buffer[rl_point] != ' ' && rl_line_buffer[rl_point] != ';')
    {
      while (rl_point < rl_end && rl_line_buffer[rl_point] != ' ' &&
	     rl_line_buffer[rl_point] != ';')
	rl_point++;
    }
  else if (rl_line_buffer[rl_point - 1] == ';')
    {
      ding ();
      return (0);
    }

  rl_possible_completions ();
  rl_point = save_pos;

  return (0);
}
#endif

/* Functions to save and restore marks. */
int
rl_vi_set_mark (count, key)
     int count __attribute__((unused)), key __attribute__((unused));
{
  int ch;

  ch = rl_read_key ();
  if (_rl_lowercase_p (ch) == 0)
    {
      ding ();
      return -1;
    }
  ch -= 'a';
  vi_mark_chars[ch] = rl_point;
  return 0;
}

int
rl_vi_goto_mark (count, key)
     int count __attribute__((unused)), key __attribute__((unused));
{
  int ch;

  ch = rl_read_key ();
  if (ch == '`')
    {
      rl_point = rl_mark;
      return 0;
    }
  else if (_rl_lowercase_p (ch) == 0)
    {
      ding ();
      return -1;
    }

  ch -= 'a';
  if (vi_mark_chars[ch] == -1)
    {
      ding ();
      return -1;
    }
  rl_point = vi_mark_chars[ch];
  return 0;
}

#endif /* VI_MODE */
