vi_mode.c

UNIX下SH的实现源码

/* vi_mode.c -- A vi emulation mode for Bash.
   Derived from code written by Jeff Sparkes ([e-mail]).  */

/* 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 2, 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,
   59 Temple Place, Suite 330, Boston, MA 02111 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"

#include "rlprivate.h"
#include "xmalloc.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

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

/* Command keys which do movement for xxx_to commands. */
static 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 char *vi_textmod = "_*\\AaIiCcDdPpYyRrSsXx~";

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

static int rl_digit_loop1 __P((void));

void
_rl_vi_initialize_line ()
{
  register int i;

  for (i = 0; i < 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;
{
  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;
{
  /* 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, 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, 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;
{
  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;
{
  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;
{
  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;
{
  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;
{
  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;
{
  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, key;
{
  rl_beg_of_line (1, key);
  rl_vi_insertion_mode (1, key);
  return (0);
}

int
rl_vi_append_mode (count, key)
     int count, 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, 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, c;
{
  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, 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, 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;
{
  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]);