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/* misc.c -- miscellaneous bindable readline functions. */

/* Copyright (C) 1987-2005 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

#if defined (HAVE_CONFIG_H)

#  include <config.h>

#endif

#if defined (HAVE_UNISTD_H)

#  include <unistd.h>

#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)

#  include <stdlib.h>

#else

#  include "ansi_stdlib.h"

#endif /* HAVE_STDLIB_H */

#if defined (HAVE_LOCALE_H)

#  include <locale.h>

#endif

#include <stdio.h>

/* System-specific feature definitions and include files. */

#include "rldefs.h"

#include "rlmbutil.h"

/* Some standard library routines. */

#include "readline.h"

#include "history.h"

#include "rlprivate.h"

#include "rlshell.h"

#include "xmalloc.h"

static int rl_digit_loop PARAMS((void));

static void _rl_history_set_point PARAMS((void));

/* Forward declarations used in this file */

void _rl_free_history_entry PARAMS((HIST_ENTRY *));

/* If non-zero, rl_get_previous_history and rl_get_next_history attempt

   to preserve the value of rl_point from line to line. */

int _rl_history_preserve_point = 0;

_rl_arg_cxt _rl_argcxt;

/* Saved target point for when _rl_history_preserve_point is set.  Special

   value of -1 means that point is at the end of the line. */

int _rl_history_saved_point = -1;

/* **************************************************************** */

/*                                                                  */

/*                      Numeric Arguments                           */

/*                                                                  */

/* **************************************************************** */

int

_rl_arg_overflow ()

{

  if (rl_numeric_arg > 1000000)

    {

      _rl_argcxt = 0;

      rl_explicit_arg = rl_numeric_arg = 0;

      rl_ding ();

      rl_restore_prompt ();

      rl_clear_message ();

      RL_UNSETSTATE(RL_STATE_NUMERICARG);

      return 1;

    }

  return 0;

}

void

_rl_arg_init ()

{

  rl_save_prompt ();

  _rl_argcxt = 0;

  RL_SETSTATE(RL_STATE_NUMERICARG);

}

int

_rl_arg_getchar ()

{

  int c;

  rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);

  RL_SETSTATE(RL_STATE_MOREINPUT);

  c = rl_read_key ();

  RL_UNSETSTATE(RL_STATE_MOREINPUT);

  return c;

}

/* Process C as part of the current numeric argument.  Return -1 if the

   argument should be aborted, 0 if we should not read any more chars, and

   1 if we should continue to read chars. */

int

_rl_arg_dispatch (cxt, c)

     _rl_arg_cxt cxt;

     int c;

{

  int key, r;

  key = c;

  /* If we see a key bound to `universal-argument' after seeing digits,

      it ends the argument but is otherwise ignored. */

  if (_rl_keymap[c].type == ISFUNC && _rl_keymap[c].function == rl_universal_argument)

    {

      if ((cxt & NUM_SAWDIGITS) == 0)

        {

          rl_numeric_arg *= 4;

          return 1;

        }

      else if (RL_ISSTATE (RL_STATE_CALLBACK))

        {

          _rl_argcxt |= NUM_READONE;

          return 0;      /* XXX */

        }

      else

        {

          RL_SETSTATE(RL_STATE_MOREINPUT);

          key = rl_read_key ();

          RL_UNSETSTATE(RL_STATE_MOREINPUT);

          rl_restore_prompt ();

          rl_clear_message ();

          RL_UNSETSTATE(RL_STATE_NUMERICARG);

          return (_rl_dispatch (key, _rl_keymap));

        }

    }

  c = UNMETA (c);

  if (_rl_digit_p (c))

    {

      r = _rl_digit_value (c);

      rl_numeric_arg = rl_explicit_arg ? (rl_numeric_arg * 10) +  r : r;

      rl_explicit_arg = 1;

      _rl_argcxt |= NUM_SAWDIGITS;

    }

  else if (c == '-' && rl_explicit_arg == 0)

    {

      rl_numeric_arg = 1;

      _rl_argcxt |= NUM_SAWMINUS;

      rl_arg_sign = -1;

    }

  else

    {

      /* Make M-- command equivalent to M--1 command. */

      if ((_rl_argcxt & NUM_SAWMINUS) && rl_numeric_arg == 1 && rl_explicit_arg == 0)

        rl_explicit_arg = 1;

      rl_restore_prompt ();

      rl_clear_message ();

      RL_UNSETSTATE(RL_STATE_NUMERICARG);

      r = _rl_dispatch (key, _rl_keymap);

      if (RL_ISSTATE (RL_STATE_CALLBACK))

        {

          /* At worst, this will cause an extra redisplay.  Otherwise,

             we have to wait until the next character comes in. */

          if (rl_done == 0)

            (*rl_redisplay_function) ();

          r = 0;

        }

      return r;

    }

  return 1;

}

/* Handle C-u style numeric args, as well as M--, and M-digits. */

static int

rl_digit_loop ()

{

  int c, r;

  while (1)

    {

      if (_rl_arg_overflow ())

        return 1;

      c = _rl_arg_getchar ();

      if (c < 0)

        {

          _rl_abort_internal ();

          return -1;

        }

      r = _rl_arg_dispatch (_rl_argcxt, c);

      if (r <= 0 || (RL_ISSTATE (RL_STATE_NUMERICARG) == 0))

        break;

    }

}

/* Create a default argument. */

void

_rl_reset_argument ()

{

  rl_numeric_arg = rl_arg_sign = 1;

  rl_explicit_arg = 0;

  _rl_argcxt = 0;

}

/* Start a numeric argument with initial value KEY */

int

rl_digit_argument (ignore, key)

     int ignore, key;

{

  _rl_arg_init ();

  if (RL_ISSTATE (RL_STATE_CALLBACK))

    {

      _rl_arg_dispatch (_rl_argcxt, key);

      rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);

      return 0;

    }

  else

    {

      rl_execute_next (key);

      return (rl_digit_loop ());

    }

}

/* C-u, universal argument.  Multiply the current argument by 4.

   Read a key.  If the key has nothing to do with arguments, then

   dispatch on it.  If the key is the abort character then abort. */

int

rl_universal_argument (count, key)

     int count, key;

{

  _rl_arg_init ();

  rl_numeric_arg *= 4;

  return (RL_ISSTATE (RL_STATE_CALLBACK) ? 0 : rl_digit_loop ());

}

int

_rl_arg_callback (cxt)

     _rl_arg_cxt cxt;

{

  int c, r;

  c = _rl_arg_getchar ();

  if (_rl_argcxt & NUM_READONE)

    {

      _rl_argcxt &= ~NUM_READONE;

      rl_restore_prompt ();

      rl_clear_message ();

      RL_UNSETSTATE(RL_STATE_NUMERICARG);

      rl_execute_next (c);

      return 0;

    }

  r = _rl_arg_dispatch (cxt, c);

  return (r != 1);

}

/* What to do when you abort reading an argument. */

int

rl_discard_argument ()

{

  rl_ding ();

  rl_clear_message ();

  _rl_reset_argument ();

  return 0;

}

/* **************************************************************** */

/*                                                                  */

/*                      History Utilities                           */

/*                                                                  */

/* **************************************************************** */

/* We already have a history library, and that is what we use to control

   the history features of readline.  This is our local interface to

   the history mechanism. */

/* While we are editing the history, this is the saved

   version of the original line. */

HIST_ENTRY *_rl_saved_line_for_history = (HIST_ENTRY *)NULL;

/* Set the history pointer back to the last entry in the history. */

void

_rl_start_using_history ()

{

  using_history ();

  if (_rl_saved_line_for_history)

    _rl_free_history_entry (_rl_saved_line_for_history);

  _rl_saved_line_for_history = (HIST_ENTRY *)NULL;

}

/* Free the contents (and containing structure) of a HIST_ENTRY. */

void

_rl_free_history_entry (entry)

     HIST_ENTRY *entry;

{

  if (entry == 0)

    return;

  FREE (entry->line);

  FREE (entry->timestamp);

  free (entry);

}

/* Perhaps put back the current line if it has changed. */

int

rl_maybe_replace_line ()

{

  HIST_ENTRY *temp;

  temp = current_history ();

  /* If the current line has changed, save the changes. */

  if (temp && ((UNDO_LIST *)(temp->data) != rl_undo_list))

    {

      temp = replace_history_entry (where_history (), rl_line_buffer, (histdata_t)rl_undo_list);

      free (temp->line);

      FREE (temp->timestamp);

      free (temp);

    }

  return 0;

}

/* Restore the _rl_saved_line_for_history if there is one. */

int

rl_maybe_unsave_line ()

{

  if (_rl_saved_line_for_history)

    {

      /* Can't call with `1' because rl_undo_list might point to an undo

         list from a history entry, as in rl_replace_from_history() below. */

      rl_replace_line (_rl_saved_line_for_history->line, 0);

      rl_undo_list = (UNDO_LIST *)_rl_saved_line_for_history->data;

      _rl_free_history_entry (_rl_saved_line_for_history);

      _rl_saved_line_for_history = (HIST_ENTRY *)NULL;

      rl_point = rl_end;        /* rl_replace_line sets rl_end */

    }

  else

    rl_ding ();

  return 0;

}

/* Save the current line in _rl_saved_line_for_history. */

int

rl_maybe_save_line ()

{

  if (_rl_saved_line_for_history == 0)

    {

      _rl_saved_line_for_history = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));

      _rl_saved_line_for_history->line = savestring (rl_line_buffer);

      _rl_saved_line_for_history->timestamp = (char *)NULL;

      _rl_saved_line_for_history->data = (char *)rl_undo_list;

    }

  return 0;

}

int

_rl_free_saved_history_line ()

{

  if (_rl_saved_line_for_history)

    {

      _rl_free_history_entry (_rl_saved_line_for_history);

      _rl_saved_line_for_history = (HIST_ENTRY *)NULL;

    }

  return 0;

}

static void

_rl_history_set_point ()

{

  rl_point = (_rl_history_preserve_point && _rl_history_saved_point != -1)

                ? _rl_history_saved_point

                : rl_end;

  if (rl_point > rl_end)

    rl_point = rl_end;

#if defined (VI_MODE)

  if (rl_editing_mode == vi_mode && _rl_keymap != vi_insertion_keymap)

    rl_point = 0;

#endif /* VI_MODE */

  if (rl_editing_mode == emacs_mode)

    rl_mark = (rl_point == rl_end ? 0 : rl_end);

}

void

rl_replace_from_history (entry, flags)

     HIST_ENTRY *entry;

     int flags;                 /* currently unused */

{

  /* Can't call with `1' because rl_undo_list might point to an undo list

     from a history entry, just like we're setting up here. */

  rl_replace_line (entry->line, 0);

  rl_undo_list = (UNDO_LIST *)entry->data;

  rl_point = rl_end;

  rl_mark = 0;

#if defined (VI_MODE)

  if (rl_editing_mode == vi_mode)

    {

      rl_point = 0;

      rl_mark = rl_end;

    }

#endif

}

/* **************************************************************** */

/*                                                                  */

/*                      History Commands                            */

/*                                                                  */

/* **************************************************************** */

/* Meta-< goes to the start of the history. */

int

rl_beginning_of_history (count, key)

     int count, key;

{

  return (rl_get_previous_history (1 + where_history (), key));

}

/* Meta-> goes to the end of the history.  (The current line). */

int

rl_end_of_history (count, key)

     int count, key;

{

  rl_maybe_replace_line ();

  using_history ();

  rl_maybe_unsave_line ();

  return 0;

}

/* Move down to the next history line. */

int

rl_get_next_history (count, key)

     int count, key;

{

  HIST_ENTRY *temp;

  if (count < 0)

    return (rl_get_previous_history (-count, key));

  if (count == 0)

    return 0;

  rl_maybe_replace_line ();

  /* either not saved by rl_newline or at end of line, so set appropriately. */

  if (_rl_history_saved_point == -1 && (rl_point || rl_end))

    _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;

  temp = (HIST_ENTRY *)NULL;

  while (count)

    {

      temp = next_history ();

      if (!temp)

        break;

      --count;

    }

  if (temp == 0)

    rl_maybe_unsave_line ();

  else

    {

      rl_replace_from_history (temp, 0);

      _rl_history_set_point ();

    }

  return 0;

}

/* Get the previous item out of our interactive history, making it the current

   line.  If there is no previous history, just ding. */

int

rl_get_previous_history (count, key)

     int count, key;

{

  HIST_ENTRY *old_temp, *temp;

  if (count < 0)

    return (rl_get_next_history (-count, key));

  if (count == 0)

    return 0;

  /* either not saved by rl_newline or at end of line, so set appropriately. */

  if (_rl_history_saved_point == -1 && (rl_point || rl_end))

    _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;

  /* If we don't have a line saved, then save this one. */

  rl_maybe_save_line ();

  /* If the current line has changed, save the changes. */

  rl_maybe_replace_line ();

  temp = old_temp = (HIST_ENTRY *)NULL;

  while (count)

    {

      temp = previous_history ();

      if (temp == 0)

        break;

      old_temp = temp;

      --count;

    }

  /* If there was a large argument, and we moved back to the start of the

     history, that is not an error.  So use the last value found. */

  if (!temp && old_temp)

    temp = old_temp;

  if (temp == 0)

    rl_ding ();

  else

    {

      rl_replace_from_history (temp, 0);

      _rl_history_set_point ();

    }

  return 0;

}

/* **************************************************************** */

/*                                                                  */

/*                          Editing Modes                           */

/*                                                                  */

/* **************************************************************** */

/* How to toggle back and forth between editing modes. */

int

rl_vi_editing_mode (count, key)

     int count, key;

{

#if defined (VI_MODE)

  _rl_set_insert_mode (RL_IM_INSERT, 1);        /* vi mode ignores insert mode */

  rl_editing_mode = vi_mode;

  rl_vi_insertion_mode (1, key);

#endif /* VI_MODE */

  return 0;

}

int

rl_emacs_editing_mode (count, key)

     int count, key;

{

  rl_editing_mode = emacs_mode;

  _rl_set_insert_mode (RL_IM_INSERT, 1); /* emacs mode default is insert mode */

  _rl_keymap = emacs_standard_keymap;

  return 0;

}

/* Function for the rest of the library to use to set insert/overwrite mode. */

void

_rl_set_insert_mode (im, force)

     int im, force;

{

#ifdef CURSOR_MODE

  _rl_set_cursor (im, force);

#endif

  rl_insert_mode = im;

}

/* Toggle overwrite mode.  A positive explicit argument selects overwrite

   mode.  A negative or zero explicit argument selects insert mode. */

int

rl_overwrite_mode (count, key)

     int count, key;

{

  if (rl_explicit_arg == 0)

    _rl_set_insert_mode (rl_insert_mode ^ 1, 0);

  else if (count > 0)

    _rl_set_insert_mode (RL_IM_OVERWRITE, 0);

  else

    _rl_set_insert_mode (RL_IM_INSERT, 0);

  return 0;

}