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

/*                                                                  */

/*                      I-Search and Searching                      */

/*                                                                  */

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

/* Copyright (C) 1987-2005 Free Software Foundation, Inc.

   This file contains the Readline Library (the Library), a set of

   routines for providing Emacs style line input to programs that ask

   for it.

   The 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 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

#include <sys/types.h>

#include <stdio.h>

#if defined (HAVE_UNISTD_H)

#  include <unistd.h>

#endif

#if defined (HAVE_STDLIB_H)

#  include <stdlib.h>

#else

#  include "ansi_stdlib.h"

#endif

#include "rldefs.h"

#include "rlmbutil.h"

#include "readline.h"

#include "history.h"

#include "rlprivate.h"

#include "xmalloc.h"

/* Variables exported to other files in the readline library. */

char *_rl_isearch_terminators = (char *)NULL;

_rl_search_cxt *_rl_iscxt = 0;

/* Variables imported from other files in the readline library. */

extern HIST_ENTRY *_rl_saved_line_for_history;

static int rl_search_history PARAMS((int, int));

static _rl_search_cxt *_rl_isearch_init PARAMS((int));

static void _rl_isearch_fini PARAMS((_rl_search_cxt *));

static int _rl_isearch_cleanup PARAMS((_rl_search_cxt *, int));

/* Last line found by the current incremental search, so we don't `find'

   identical lines many times in a row. */

static char *prev_line_found;

/* Last search string and its length. */

static char *last_isearch_string;

static int last_isearch_string_len;

static char *default_isearch_terminators = "\033\012";

_rl_search_cxt *

_rl_scxt_alloc (type, flags)

     int type, flags;

{

  _rl_search_cxt *cxt;

  cxt = (_rl_search_cxt *)xmalloc (sizeof (_rl_search_cxt));

  cxt->type = type;

  cxt->sflags = flags;

  cxt->search_string = 0;

  cxt->search_string_size = cxt->search_string_index = 0;

  cxt->lines = 0;

  cxt->allocated_line = 0;

  cxt->hlen = cxt->hindex = 0;

  cxt->save_point = rl_point;

  cxt->save_mark = rl_mark;

  cxt->save_line = where_history ();

  cxt->last_found_line = cxt->save_line;

  cxt->prev_line_found = 0;

  cxt->save_undo_list = 0;

  cxt->history_pos = 0;

  cxt->direction = 0;

  cxt->lastc = 0;

  cxt->sline = 0;

  cxt->sline_len = cxt->sline_index = 0;

  cxt->search_terminators = 0;

  return cxt;

}

void

_rl_scxt_dispose (cxt, flags)

     _rl_search_cxt *cxt;

     int flags;

{

  FREE (cxt->search_string);

  FREE (cxt->allocated_line);

  FREE (cxt->lines);

  free (cxt);

}

/* Search backwards through the history looking for a string which is typed

   interactively.  Start with the current line. */

int

rl_reverse_search_history (sign, key)

     int sign, key;

{

  return (rl_search_history (-sign, key));

}

/* Search forwards through the history looking for a string which is typed

   interactively.  Start with the current line. */

int

rl_forward_search_history (sign, key)

     int sign, key;

{

  return (rl_search_history (sign, key));

}

/* Display the current state of the search in the echo-area.

   SEARCH_STRING contains the string that is being searched for,

   DIRECTION is zero for forward, or non-zero for reverse,

   WHERE is the history list number of the current line.  If it is

   -1, then this line is the starting one. */

static void

rl_display_search (search_string, reverse_p, where)

     char *search_string;

     int reverse_p, where;

{

  char *message;

  int msglen, searchlen;

  searchlen = (search_string && *search_string) ? strlen (search_string) : 0;

  message = (char *)xmalloc (searchlen + 33);

  msglen = 0;

#if defined (NOTDEF)

  if (where != -1)

    {

      sprintf (message, "[%d]", where + history_base);

      msglen = strlen (message);

    }

#endif /* NOTDEF */

  message[msglen++] = '(';

  if (reverse_p)

    {

      strcpy (message + msglen, "reverse-");

      msglen += 8;

    }

  strcpy (message + msglen, "i-search)`");

  msglen += 10;

  if (search_string)

    {

      strcpy (message + msglen, search_string);

      msglen += searchlen;

    }

  strcpy (message + msglen, "': ");

  rl_message ("%s", message);

  free (message);

  (*rl_redisplay_function) ();

}

static _rl_search_cxt *

_rl_isearch_init (direction)

     int direction;

{

  _rl_search_cxt *cxt;

  register int i;

  HIST_ENTRY **hlist;

  cxt = _rl_scxt_alloc (RL_SEARCH_ISEARCH, 0);

  if (direction < 0)

    cxt->sflags |= SF_REVERSE;

  cxt->search_terminators = _rl_isearch_terminators ? _rl_isearch_terminators

                                                : default_isearch_terminators;

  /* Create an arrary of pointers to the lines that we want to search. */

  hlist = history_list ();

  rl_maybe_replace_line ();

  i = 0;

  if (hlist)

    for (i = 0; hlist[i]; i++);

  /* Allocate space for this many lines, +1 for the current input line,

     and remember those lines. */

  cxt->lines = (char **)xmalloc ((1 + (cxt->hlen = i)) * sizeof (char *));

  for (i = 0; i < cxt->hlen; i++)

    cxt->lines[i] = hlist[i]->line;

  if (_rl_saved_line_for_history)

    cxt->lines[i] = _rl_saved_line_for_history->line;

  else

    {

      /* Keep track of this so we can free it. */

      cxt->allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));

      strcpy (cxt->allocated_line, &rl_line_buffer[0]);

      cxt->lines[i] = cxt->allocated_line;

    }

  cxt->hlen++;

  /* The line where we start the search. */

  cxt->history_pos = cxt->save_line;

  rl_save_prompt ();

  /* Initialize search parameters. */

  cxt->search_string = (char *)xmalloc (cxt->search_string_size = 128);

  cxt->search_string[cxt->search_string_index = 0] = '\0';

  /* Normalize DIRECTION into 1 or -1. */

  cxt->direction = (direction >= 0) ? 1 : -1;

  cxt->sline = rl_line_buffer;

  cxt->sline_len = strlen (cxt->sline);

  cxt->sline_index = rl_point;

  _rl_iscxt = cxt;              /* save globally */

  return cxt;

}

static void

_rl_isearch_fini (cxt)

     _rl_search_cxt *cxt;

{

  /* First put back the original state. */

  strcpy (rl_line_buffer, cxt->lines[cxt->save_line]);

  rl_restore_prompt ();

  /* Save the search string for possible later use. */

  FREE (last_isearch_string);

  last_isearch_string = cxt->search_string;

  last_isearch_string_len = cxt->search_string_index;

  cxt->search_string = 0;

  if (cxt->last_found_line < cxt->save_line)

    rl_get_previous_history (cxt->save_line - cxt->last_found_line, 0);

  else

    rl_get_next_history (cxt->last_found_line - cxt->save_line, 0);

  /* If the string was not found, put point at the end of the last matching

     line.  If last_found_line == orig_line, we didn't find any matching

     history lines at all, so put point back in its original position. */

  if (cxt->sline_index < 0)

    {

      if (cxt->last_found_line == cxt->save_line)

        cxt->sline_index = cxt->save_point;

      else

        cxt->sline_index = strlen (rl_line_buffer);

      rl_mark = cxt->save_mark;

    }

  rl_point = cxt->sline_index;

  /* Don't worry about where to put the mark here; rl_get_previous_history

     and rl_get_next_history take care of it. */

  rl_clear_message ();

}

int

_rl_search_getchar (cxt)

     _rl_search_cxt *cxt;

{

  int c;

  /* Read a key and decide how to proceed. */

  RL_SETSTATE(RL_STATE_MOREINPUT);

  c = cxt->lastc = rl_read_key ();

  RL_UNSETSTATE(RL_STATE_MOREINPUT);

#if defined (HANDLE_MULTIBYTE)

  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)

    c = cxt->lastc = _rl_read_mbstring (cxt->lastc, cxt->mb, MB_LEN_MAX);

#endif

  return c;

}

/* Process just-read character C according to isearch context CXT.  Return

   -1 if the caller should just free the context and return, 0 if we should

   break out of the loop, and 1 if we should continue to read characters. */

int

_rl_isearch_dispatch (cxt, c)

     _rl_search_cxt *cxt;

     int c;

{

  int n, wstart, wlen, limit, cval;

  rl_command_func_t *f;

  f = (rl_command_func_t *)NULL;

 /* Translate the keys we do something with to opcodes. */

  if (c >= 0 && _rl_keymap[c].type == ISFUNC)

    {

      f = _rl_keymap[c].function;

      if (f == rl_reverse_search_history)

        cxt->lastc = (cxt->sflags & SF_REVERSE) ? -1 : -2;

      else if (f == rl_forward_search_history)

        cxt->lastc = (cxt->sflags & SF_REVERSE) ? -2 : -1;

      else if (f == rl_rubout)

        cxt->lastc = -3;

      else if (c == CTRL ('G'))

        cxt->lastc = -4;

      else if (c == CTRL ('W')) /* XXX */

        cxt->lastc = -5;

      else if (c == CTRL ('Y')) /* XXX */

        cxt->lastc = -6;

    }

  /* The characters in isearch_terminators (set from the user-settable

     variable isearch-terminators) are used to terminate the search but

     not subsequently execute the character as a command.  The default

     value is "\033\012" (ESC and C-J). */

  if (strchr (cxt->search_terminators, cxt->lastc))

    {

      /* ESC still terminates the search, but if there is pending

         input or if input arrives within 0.1 seconds (on systems

         with select(2)) it is used as a prefix character

         with rl_execute_next.  WATCH OUT FOR THIS!  This is intended

         to allow the arrow keys to be used like ^F and ^B are used

         to terminate the search and execute the movement command.

         XXX - since _rl_input_available depends on the application-

         settable keyboard timeout value, this could alternatively

         use _rl_input_queued(100000) */

      if (cxt->lastc == ESC && _rl_input_available ())

        rl_execute_next (ESC);

      return (0);

    }

#define ENDSRCH_CHAR(c) \

  ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G')))

#if defined (HANDLE_MULTIBYTE)

  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)

    {

      if (cxt->lastc >= 0 && (cxt->mb[0] && cxt->mb[1] == '\0') && ENDSRCH_CHAR (cxt->lastc))

        {

          /* This sets rl_pending_input to c; it will be picked up the next

             time rl_read_key is called. */

          rl_execute_next (cxt->lastc);

          return (0);

        }

    }

  else

#endif

    if (cxt->lastc >= 0 && ENDSRCH_CHAR (cxt->lastc))

      {

        /* This sets rl_pending_input to LASTC; it will be picked up the next

           time rl_read_key is called. */

        rl_execute_next (cxt->lastc);

        return (0);

      }

  /* Now dispatch on the character.  `Opcodes' affect the search string or

     state.  Other characters are added to the string.  */

  switch (cxt->lastc)

    {

    /* search again */

    case -1:

      if (cxt->search_string_index == 0)

        {

          if (last_isearch_string)

            {

              cxt->search_string_size = 64 + last_isearch_string_len;

              cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);

              strcpy (cxt->search_string, last_isearch_string);

              cxt->search_string_index = last_isearch_string_len;

              rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);

              break;

            }

          return (1);

        }

      else if (cxt->sflags & SF_REVERSE)

        cxt->sline_index--;

      else if (cxt->sline_index != cxt->sline_len)

        cxt->sline_index++;

      else

        rl_ding ();

      break;

    /* switch directions */

    case -2:

      cxt->direction = -cxt->direction;

      if (cxt->direction < 0)

        cxt->sflags |= SF_REVERSE;

      else

        cxt->sflags &= ~SF_REVERSE;

      break;

    /* delete character from search string. */

    case -3:    /* C-H, DEL */

      /* This is tricky.  To do this right, we need to keep a

         stack of search positions for the current search, with

         sentinels marking the beginning and end.  But this will

         do until we have a real isearch-undo. */

      if (cxt->search_string_index == 0)

        rl_ding ();

      else

        cxt->search_string[--cxt->search_string_index] = '\0';

      break;

    case -4:    /* C-G, abort */

      rl_replace_line (cxt->lines[cxt->save_line], 0);

      rl_point = cxt->save_point;

      rl_mark = cxt->save_mark;

      rl_restore_prompt();

      rl_clear_message ();

      return -1;

    case -5:    /* C-W */

      /* skip over portion of line we already matched and yank word */

      wstart = rl_point + cxt->search_string_index;

      if (wstart >= rl_end)

        {

          rl_ding ();

          break;

        }

      /* if not in a word, move to one. */

      cval = _rl_char_value (rl_line_buffer, wstart);

      if (_rl_walphabetic (cval) == 0)

        {

          rl_ding ();

          break;

        }

      n = MB_NEXTCHAR (rl_line_buffer, wstart, 1, MB_FIND_NONZERO);;

      while (n < rl_end)

        {

          cval = _rl_char_value (rl_line_buffer, n);

          if (_rl_walphabetic (cval) == 0)

            break;

          n = MB_NEXTCHAR (rl_line_buffer, n, 1, MB_FIND_NONZERO);;

        }

      wlen = n - wstart + 1;

      if (cxt->search_string_index + wlen + 1 >= cxt->search_string_size)

        {

          cxt->search_string_size += wlen + 1;

          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);

        }

      for (; wstart < n; wstart++)

        cxt->search_string[cxt->search_string_index++] = rl_line_buffer[wstart];

      cxt->search_string[cxt->search_string_index] = '\0';

      break;

    case -6:    /* C-Y */

      /* skip over portion of line we already matched and yank rest */

      wstart = rl_point + cxt->search_string_index;

      if (wstart >= rl_end)

        {

          rl_ding ();

          break;

        }

      n = rl_end - wstart + 1;

      if (cxt->search_string_index + n + 1 >= cxt->search_string_size)

        {

          cxt->search_string_size += n + 1;

          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);

        }

      for (n = wstart; n < rl_end; n++)

        cxt->search_string[cxt->search_string_index++] = rl_line_buffer[n];

      cxt->search_string[cxt->search_string_index] = '\0';

      break;

    /* Add character to search string and continue search. */

    default:

      if (cxt->search_string_index + 2 >= cxt->search_string_size)

        {

          cxt->search_string_size += 128;

          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);

        }

#if defined (HANDLE_MULTIBYTE)

      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)

        {

          int j, l;

          for (j = 0, l = strlen (cxt->mb); j < l; )

            cxt->search_string[cxt->search_string_index++] = cxt->mb[j++];

        }

      else

#endif

        cxt->search_string[cxt->search_string_index++] = c;

      cxt->search_string[cxt->search_string_index] = '\0';

      break;

    }

  for (cxt->sflags &= ~(SF_FOUND|SF_FAILED);; )

    {

      limit = cxt->sline_len - cxt->search_string_index + 1;

      /* Search the current line. */

      while ((cxt->sflags & SF_REVERSE) ? (cxt->sline_index >= 0) : (cxt->sline_index < limit))

        {

          if (STREQN (cxt->search_string, cxt->sline + cxt->sline_index, cxt->search_string_index))

            {

              cxt->sflags |= SF_FOUND;

              break;

            }

          else

            cxt->sline_index += cxt->direction;

        }

      if (cxt->sflags & SF_FOUND)

        break;

      /* Move to the next line, but skip new copies of the line

         we just found and lines shorter than the string we're

         searching for. */

      do

        {

          /* Move to the next line. */

          cxt->history_pos += cxt->direction;

          /* At limit for direction? */

          if ((cxt->sflags & SF_REVERSE) ? (cxt->history_pos < 0) : (cxt->history_pos == cxt->hlen))

            {

              cxt->sflags |= SF_FAILED;

              break;

            }

          /* We will need these later. */

          cxt->sline = cxt->lines[cxt->history_pos];

          cxt->sline_len = strlen (cxt->sline);

        }

      while ((cxt->prev_line_found && STREQ (cxt->prev_line_found, cxt->lines[cxt->history_pos])) ||

             (cxt->search_string_index > cxt->sline_len));

      if (cxt->sflags & SF_FAILED)

        break;

      /* Now set up the line for searching... */

      cxt->sline_index = (cxt->sflags & SF_REVERSE) ? cxt->sline_len - cxt->search_string_index : 0;

    }

  if (cxt->sflags & SF_FAILED)

    {

      /* We cannot find the search string.  Ding the bell. */

      rl_ding ();

      cxt->history_pos = cxt->last_found_line;

      return 1;

    }

  /* We have found the search string.  Just display it.  But don't

     actually move there in the history list until the user accepts

     the location. */

  if (cxt->sflags & SF_FOUND)

    {

      cxt->prev_line_found = cxt->lines[cxt->history_pos];

      rl_replace_line (cxt->lines[cxt->history_pos], 0);

      rl_point = cxt->sline_index;

      cxt->last_found_line = cxt->history_pos;

      rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), (cxt->history_pos == cxt->save_line) ? -1 : cxt->history_pos);

    }

  return 1;

}

static int

_rl_isearch_cleanup (cxt, r)

     _rl_search_cxt *cxt;

     int r;

{

  if (r >= 0)

    _rl_isearch_fini (cxt);

  _rl_scxt_dispose (cxt, 0);

  _rl_iscxt = 0;

  RL_UNSETSTATE(RL_STATE_ISEARCH);

  return (r != 0);

}

/* Search through the history looking for an interactively typed string.

   This is analogous to i-search.  We start the search in the current line.

   DIRECTION is which direction to search; >= 0 means forward, < 0 means

   backwards. */

static int

rl_search_history (direction, invoking_key)

     int direction, invoking_key;

{

  _rl_search_cxt *cxt;          /* local for now, but saved globally */

  int c, r;

  RL_SETSTATE(RL_STATE_ISEARCH);

  cxt = _rl_isearch_init (direction);

  rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);

  /* If we are using the callback interface, all we do is set up here and

      return.  The key is that we leave RL_STATE_ISEARCH set. */

  if (RL_ISSTATE (RL_STATE_CALLBACK))

    return (0);

  r = -1;

  for (;;)

    {

      c = _rl_search_getchar (cxt);

      /* We might want to handle EOF here (c == 0) */

      r = _rl_isearch_dispatch (cxt, cxt->lastc);

      if (r <= 0)

        break;

    }

  /* The searching is over.  The user may have found the string that she

     was looking for, or else she may have exited a failing search.  If

     LINE_INDEX is -1, then that shows that the string searched for was

     not found.  We use this to determine where to place rl_point. */

  return (_rl_isearch_cleanup (cxt, r));

}

#if defined (READLINE_CALLBACKS)

/* Called from the callback functions when we are ready to read a key.  The

   callback functions know to call this because RL_ISSTATE(RL_STATE_ISEARCH).

   If _rl_isearch_dispatch finishes searching, this function is responsible

   for turning off RL_STATE_ISEARCH, which it does using _rl_isearch_cleanup. */

int

_rl_isearch_callback (cxt)

     _rl_search_cxt *cxt;

{

  int c, r;

  c = _rl_search_getchar (cxt);

  /* We might want to handle EOF here */

  r = _rl_isearch_dispatch (cxt, cxt->lastc);

  return (r <= 0) ? _rl_isearch_cleanup (cxt, r) : 0;

}

#endif