/* Minibuffer input and completion.
   Copyright (C) 1985, 1986, 1992-1995 Free Software Foundation, Inc.
   Copyright (C) 1995 Sun Microsystems, Inc.
   Copyright (C) 2002 Ben Wing.

This file is part of XEmacs.

XEmacs 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.

XEmacs 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.

You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Mule 2.0, FSF 19.28.  Mule-ized except as noted.
   Substantially different from FSF. */

/* #### dmoore - All sorts of things in here can call lisp, like message.
   Track all this stuff. */

#include <config.h>
#include "lisp.h"

#include "buffer.h"
#include "commands.h"
#include "console-stream.h"
#include "events.h"
#include "frame-impl.h"
#include "insdel.h"
#include "redisplay.h"
#include "window-impl.h"

/* Depth in minibuffer invocations.  */
int minibuf_level;

Lisp_Object Qcompletion_ignore_case;

/* Nonzero means completion ignores case.  */
int completion_ignore_case;

/* List of regexps that should restrict possible completions.  */
Lisp_Object Vcompletion_regexp_list;

/* The echo area buffer. */
Lisp_Object Vecho_area_buffer;

/* Prompt to display in front of the minibuffer contents */
Lisp_Object Vminibuf_prompt;

/* Added on 97/3/14 by Jareth Hein (jhod@po.iijnet.or.jp) for input system support */
/* String to be displayed in front of prompt of the minibuffer contents */
Lisp_Object Vminibuf_preprompt;

/* Hook to run just after entry to minibuffer. */
Lisp_Object Qminibuffer_setup_hook, Vminibuffer_setup_hook;

Lisp_Object Qappend_message, Qcurrent_message_label,
            Qclear_message, Qdisplay_message;


DEFUN ("minibuffer-depth", Fminibuffer_depth, 0, 0, 0, /*
Return current depth of activations of minibuffer, a nonnegative integer.
*/
       ())
{
  return make_int (minibuf_level);
}

/* The default buffer to use as the window-buffer of minibuffer windows */
/*  Note there is special code in kill-buffer to make this unkillable */
Lisp_Object Vminibuffer_zero;


/* Actual minibuffer invocation. */

static Lisp_Object
read_minibuffer_internal_unwind (Lisp_Object unwind_data)
{
  Lisp_Object frame;
  XWINDOW (minibuf_window)->last_modified[CURRENT_DISP] = Qzero;
  XWINDOW (minibuf_window)->last_modified[DESIRED_DISP] = Qzero;
  XWINDOW (minibuf_window)->last_modified[CMOTION_DISP] = Qzero;
  XWINDOW (minibuf_window)->last_facechange[CURRENT_DISP] = Qzero;
  XWINDOW (minibuf_window)->last_facechange[DESIRED_DISP] = Qzero;
  XWINDOW (minibuf_window)->last_facechange[CMOTION_DISP] = Qzero;
  Vminibuf_prompt = Felt (unwind_data, Qzero);
  minibuf_level = XINT (Felt (unwind_data, make_int (1)));
  while (CONSP (unwind_data))
    {
      Lisp_Object victim = unwind_data;
      unwind_data = XCDR (unwind_data);
      free_cons (victim);
    }

  /* If cursor is on the minibuffer line,
     show the user we have exited by putting it in column 0.  */
  frame = Fselected_frame (Qnil);
  if (!noninteractive
      && !NILP (frame)
      && !NILP (XFRAME (frame)->minibuffer_window))
    {
      struct window *w = XWINDOW (XFRAME (frame)->minibuffer_window);
      redisplay_move_cursor (w, 0, 0);
    }

  return Qnil;
}

/* 97/4/13 jhod: Added for input methods */
DEFUN ("set-minibuffer-preprompt", Fset_minibuffer_preprompt, 1, 1, 0, /*
Set the minibuffer preprompt string to PREPROMPT. This is used by language
input methods to relay state information to the user.
*/
       (preprompt))
{
  if (NILP (preprompt))
    {
      Vminibuf_preprompt = Qnil;
    }
  else
    {
      CHECK_STRING (preprompt);

      Vminibuf_preprompt = LISP_GETTEXT (preprompt);
    }
  return Qnil;
}

DEFUN ("read-minibuffer-internal", Fread_minibuffer_internal, 1, 1, 0, /*
Lowest-level interface to minibuffers.  Don't call this.
*/
       (prompt))
{
  /* This function can GC */
  int speccount = specpdl_depth ();
  Lisp_Object val;

  CHECK_STRING (prompt);

  single_console_state ();

  record_unwind_protect (read_minibuffer_internal_unwind,
                         noseeum_cons
			 (Vminibuf_prompt,
			  noseeum_cons (make_int (minibuf_level), Qnil)));
  Vminibuf_prompt = LISP_GETTEXT (prompt);

  /* NOTE: Here (or somewhere around here), in FSFmacs 19.30,
     choose_minibuf_frame() is called.  This is the only
     place in FSFmacs that it's called any more -- there's
     also a call in xterm.c, but commented out, and 19.28
     had the calls in different places.

     choose_minibuf_frame() does the following:

  if (!EQ (minibuf_window, selected_frame()->minibuffer_window))
    {
      Fset_window_buffer (selected_frame()->minibuffer_window,
			  XWINDOW (minibuf_window)->buffer);
      minibuf_window = selected_frame()->minibuffer_window;
    }

  #### Note that we don't do the set-window-buffer.  This call is
  similar, but not identical, to a set-window-buffer call made
  in `read-from-minibuffer' in minibuf.el.  I hope it's close
  enough, because minibuf_window isn't really exported to Lisp.

  The comment above choose_minibuf_frame() reads:

  Put minibuf on currently selected frame's minibuffer.
  We do this whenever the user starts a new minibuffer
  or when a minibuffer exits.  */

  minibuf_window = FRAME_MINIBUF_WINDOW (selected_frame ());

  run_hook (Qminibuffer_setup_hook);

  minibuf_level++;
  clear_echo_area (selected_frame (), Qnil, 0);

  val = call_command_loop (Qt);

  return unbind_to_1 (speccount, val);
}



/* Completion hair */

/* Compare exactly LEN chars of strings at S1 and S2,
   ignoring case if appropriate.
   Return -1 if strings match,
   else number of chars that match at the beginning.  */

/* Note that this function works in Charcounts, unlike most functions.
   This is necessary for many reasons, one of which is that two
   strings may match even if they have different numbers of bytes,
   if IGNORE_CASE is true. */

Charcount
scmp_1 (const Ibyte *s1, const Ibyte *s2, Charcount len,
	int ignore_case)
{
  Charcount l = len;

  if (ignore_case)
    {
      while (l)
        {
          Ichar c1 = DOWNCASE (0, itext_ichar (s1));
          Ichar c2 = DOWNCASE (0, itext_ichar (s2));

          if (c1 == c2)
            {
              l--;
              INC_IBYTEPTR (s1);
              INC_IBYTEPTR (s2);
            }
          else
            break;
        }
    }
  else
    {
      while (l && itext_ichar (s1) == itext_ichar (s2))
	{
	  l--;
	  INC_IBYTEPTR (s1);
	  INC_IBYTEPTR (s2);
	}
    }

  if (l == 0)
    return -1;
  else return len - l;
}


int
regexp_ignore_completion_p (const Ibyte *nonreloc,
			    Lisp_Object reloc, Bytecount offset,
			    Bytecount length)
{
  /* Ignore this element if it fails to match all the regexps.  */
  if (!NILP (Vcompletion_regexp_list))
    {
      Lisp_Object regexps;
      EXTERNAL_LIST_LOOP (regexps, Vcompletion_regexp_list)
	{
	  Lisp_Object re = XCAR (regexps);
	  CHECK_STRING (re);
	  if (fast_string_match (re, nonreloc, reloc, offset,
				 length, 0, ERROR_ME, 0) < 0)
	    return 1;
	}
    }
  return 0;
}


/* Callers should GCPRO, since this may call eval */
static int
ignore_completion_p (Lisp_Object completion_string,
                     Lisp_Object pred, Lisp_Object completion)
{
  if (regexp_ignore_completion_p (0, completion_string, 0, -1))
    return 1;

  /* Ignore this element if there is a predicate
     and the predicate doesn't like it. */
  if (!NILP (pred))
  {
    Lisp_Object tem;
    if (EQ (pred, Qcommandp))
      tem = Fcommandp (completion);
    else
      tem = call1 (pred, completion);
    if (NILP (tem))
      return 1;
  }
  return 0;
}


/* #### Maybe we should allow COLLECTION to be a hash table.
   It is wrong for the use of obarrays to be better-rewarded than the
   use of hash tables.  By better-rewarded I mean that you can pass an
   obarray to all of the completion functions, whereas you can't do
   anything like that with a hash table.

   To do so, there should probably be a
   map_obarray_or_alist_or_hash_table function which would be used by
   both Ftry_completion and Fall_completions.  [[ But would the
   additional funcalls slow things down? ]] Seriously doubtful. --ben */

DEFUN ("try-completion", Ftry_completion, 2, 3, 0, /*
Return common substring of all completions of STRING in COLLECTION.
COLLECTION must be an alist, an obarray, or a function.
Each string in COLLECTION is tested to see if it begins with STRING.
All that match are compared together; the longest initial sequence
common to all matches is returned as a string.  If there is no match
at all, nil is returned.  For an exact match, t is returned.

If COLLECTION is an alist, the cars of the elements of the alist
\(which must be strings) form the set of possible completions.

If COLLECTION is an obarray, the names of all symbols in the obarray
are the possible completions.

If COLLECTION is a function, it is called with three arguments: the
values STRING, PREDICATE and nil.  Whatever it returns becomes the
value of `try-completion'.

If optional third argument PREDICATE is non-nil, it is used to test
each possible match.  The match is a candidate only if PREDICATE
returns non-nil.  The argument given to PREDICATE is the alist element
or the symbol from the obarray.
*/
       (string, collection, predicate))
{
  /* This function can GC */
  Lisp_Object bestmatch, tail;
  Charcount bestmatchsize = 0;
  int list;
  int indice = 0;
  int matchcount = 0;
  int obsize;
  Lisp_Object bucket;
  Charcount slength, blength;

  CHECK_STRING (string);

  if (CONSP (collection))
    {
      Lisp_Object tem = XCAR (collection);
      if (SYMBOLP (tem))	/* lambda, autoload, etc.  Emacs-lisp sucks */
	return call3 (collection, string, predicate, Qnil);
      else
	list = 1;
    }
  else if (VECTORP (collection))
    list = 0;
  else if (NILP (collection))
    list = 1;
  else
    return call3 (collection, string, predicate, Qnil);

  bestmatch = Qnil;
  blength = 0;
  slength = string_char_length (string);

  /* If COLLECTION is not a list, set TAIL just for gc pro.  */
  tail = collection;
  if (!list)
    {
      obsize = XVECTOR_LENGTH (collection);
      bucket = XVECTOR_DATA (collection)[indice];
    }
  else /* warning suppression */
    {
      obsize = 0;
      bucket = Qnil;
    }

  while (1)
    {
      /* Get the next element of the alist or obarray. */
      /* Exit the loop if the elements are all used up. */
      /* elt gets the alist element or symbol.
	 eltstring gets the name to check as a completion. */
      Lisp_Object elt;
      Lisp_Object eltstring;

      if (list)
	{
	  if (NILP (tail))
	    break;
	  elt = Fcar (tail);
	  eltstring = Fcar (elt);
	  tail = Fcdr (tail);
	}
      else
	{
	  if (!ZEROP (bucket))
	    {
              Lisp_Symbol *next;
	      if (!SYMBOLP (bucket))
		{
		  invalid_argument ("Bad obarray passed to try-completions",
				    bucket);
		}
	      next = symbol_next (XSYMBOL (bucket));
	      elt = bucket;
	      eltstring = Fsymbol_name (elt);
              if (next)
		bucket = wrap_symbol (next);
	      else
		bucket = Qzero;
	    }
	  else if (++indice >= obsize)
	    break;
	  else
	    {
	      bucket = XVECTOR_DATA (collection)[indice];
	      continue;
	    }
	}

      /* Is this element a possible completion? */

      if (STRINGP (eltstring))
	{
	  Charcount eltlength = string_char_length (eltstring);
	  if (slength <= eltlength
	      && (0 > scmp (XSTRING_DATA (eltstring),
                            XSTRING_DATA (string),
                            slength)))
	    {
              {
                struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
                int loser;
                GCPRO4 (tail, string, eltstring, bestmatch);
                loser = ignore_completion_p (eltstring, predicate, elt);
                UNGCPRO;
                if (loser)      /* reject this one */
                  continue;
              }

	      /* Update computation of how much all possible
		 completions match */

	      matchcount++;
	      if (NILP (bestmatch))
		{
		  bestmatch = eltstring;
                  blength = eltlength;
		  bestmatchsize = eltlength;
		}
	      else
		{
		  Charcount compare = min (bestmatchsize, eltlength);
		  Charcount matchsize =
		    scmp (XSTRING_DATA (bestmatch),
			  XSTRING_DATA (eltstring),
			  compare);
		  if (matchsize < 0)
		    matchsize = compare;
		  if (completion_ignore_case)
		    {
		      /* If this is an exact match except for case,
			 use it as the best match rather than one that is not
			 an exact match.  This way, we get the case pattern
			 of the actual match.  */
		      if ((matchsize == eltlength
			   && matchsize < blength)
			  ||
			  /* If there is more than one exact match ignoring
			     case, and one of them is exact including case,
			     prefer that one.  */
			  /* If there is no exact match ignoring case,
			     prefer a match that does not change the case
			     of the input.  */
			  ((matchsize == eltlength)
			   ==
			   (matchsize == blength)
			   && 0 > scmp_1 (XSTRING_DATA (eltstring),
					  XSTRING_DATA (string),
					  slength, 0)
			   && 0 <= scmp_1 (XSTRING_DATA (bestmatch),
					   XSTRING_DATA (string),
					   slength, 0)))
                      {
			bestmatch = eltstring;
                        blength = eltlength;
                      }
		    }
		  bestmatchsize = matchsize;
		}
	    }
	}
    }

  if (NILP (bestmatch))
    return Qnil;		/* No completions found */
  /* If we are ignoring case, and there is no exact match,
     and no additional text was supplied,
     don't change the case of what the user typed.  */
  if (completion_ignore_case
      && bestmatchsize == slength
      && blength > bestmatchsize)
    return string;

  /* Return t if the supplied string is an exact match (counting case);
     it does not require any change to be made.  */
  if (matchcount == 1
      && bestmatchsize == slength
      && 0 > scmp_1 (XSTRING_DATA (bestmatch),
		     XSTRING_DATA (string),
		     bestmatchsize, 0))
    return Qt;

  /* Else extract the part in which all completions agree */
  return Fsubstring (bestmatch, Qzero, make_int (bestmatchsize));
}


DEFUN ("all-completions", Fall_completions, 2, 3, 0, /*
Search for partial matches to STRING in COLLECTION.
COLLECTION must be an alist, an obarray, or a function.
Each string in COLLECTION is tested to see if it begins with STRING.
The value is a list of all the strings from COLLECTION that match.

If COLLECTION is an alist, the cars of the elements of the alist
\(which must be strings) form the set of possible completions.

If COLLECTION is an obarray, the names of all symbols in the obarray
are the possible completions.

If COLLECTION is a function, it is called with three arguments: the
values STRING, PREDICATE and t.  Whatever it returns becomes the
value of `all-completions'.

If optional third argument PREDICATE is non-nil, it is used to test
each possible match.  The match is a candidate only if PREDICATE
returns non-nil.  The argument given to PREDICATE is the alist element
or the symbol from the obarray.
*/
       (string, collection, predicate))
{
  /* This function can GC */
  Lisp_Object tail;
  Lisp_Object allmatches;
  int list;
  int indice = 0;
  int obsize;
  Lisp_Object bucket;
  Charcount slength;

  CHECK_STRING (string);

  if (CONSP (collection))
    {
      Lisp_Object tem = XCAR (collection);
      if (SYMBOLP (tem))	/* lambda, autoload, etc.  Emacs-lisp sucks */
	return call3 (collection, string, predicate, Qt);
      else
	list = 1;
    }
  else if (VECTORP (collection))
    list = 0;
  else if (NILP (collection))
    list = 1;
  else
    return call3 (collection, string, predicate, Qt);

  allmatches = Qnil;
  slength = string_char_length (string);

  /* If COLLECTION is not a list, set TAIL just for gc pro.  */
  tail = collection;
  if (!list)
    {
      obsize = XVECTOR_LENGTH (collection);
      bucket = XVECTOR_DATA (collection)[indice];
    }
  else /* warning suppression */
    {
      obsize = 0;
      bucket = Qnil;
    }

  while (1)
    {
      /* Get the next element of the alist or obarray. */
      /* Exit the loop if the elements are all used up. */
      /* elt gets the alist element or symbol.
	 eltstring gets the name to check as a completion. */
      Lisp_Object elt;
      Lisp_Object eltstring;

      if (list)
	{
	  if (NILP (tail))
	    break;
	  elt = Fcar (tail);
	  eltstring = Fcar (elt);
	  tail = Fcdr (tail);
	}
      else
	{
	  if (!ZEROP (bucket))
	    {
              Lisp_Symbol *next = symbol_next (XSYMBOL (bucket));
	      elt = bucket;
	      eltstring = Fsymbol_name (elt);
              if (next)
		bucket = wrap_symbol (next);
	      else
		bucket = Qzero;
            }
	  else if (++indice >= obsize)
	    break;
	  else
	    {
	      bucket = XVECTOR_DATA (collection)[indice];
	      continue;
	    }
	}

      /* Is this element a possible completion? */

      if (STRINGP (eltstring)
          && (slength <= string_char_length (eltstring))
          /* Reject alternatives that start with space
	     unless the input starts with space.  */
	  && ((string_char_length (string) > 0 &&
	       string_ichar (string, 0) == ' ')
	      || string_ichar (eltstring, 0) != ' ')
	  && (0 > scmp (XSTRING_DATA (eltstring),
                        XSTRING_DATA (string),
                        slength)))
	{
	  /* Yes.  Now check whether predicate likes it. */
          struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
          int loser;
          GCPRO4 (tail, eltstring, allmatches, string);
          loser = ignore_completion_p (eltstring, predicate, elt);
          UNGCPRO;
          if (!loser)
            /* Ok => put it on the list. */
            allmatches = Fcons (eltstring, allmatches);
        }
    }

  return Fnreverse (allmatches);
}

/* Useless FSFmacs functions */
/* More than useless.  I've nuked minibuf_prompt_width so they won't
   function at all in XEmacs at the moment.  They are used to
   implement some braindamage in FSF which we aren't including. --cet */

#if 0
DEFUN ("minibuffer-prompt", Fminibuffer_prompt, 0, 0, 0, /*
Return the prompt string of the currently-active minibuffer.
If no minibuffer is active, return nil.
*/
	 ())
{
  return Fcopy_sequence (Vminibuf_prompt);
}

DEFUN ("minibuffer-prompt-width", Fminibuffer_prompt_width, 0, 0, 0, /*
Return the display width of the minibuffer prompt.
*/
	 ())
{
  return make_int (minibuf_prompt_width);
}
#endif /* 0 */


/************************************************************************/
/*                              echo area                               */
/************************************************************************/

extern int stdout_needs_newline;

static Lisp_Object
clear_echo_area_internal (struct frame *f, Lisp_Object label, int from_print,
			  int no_restore)
{
  /* This function can call lisp */
  if (!NILP (Ffboundp (Qclear_message)))
    {
      Lisp_Object frame = wrap_frame (f);

      return call4 (Qclear_message, label, frame, from_print ? Qt : Qnil,
		    no_restore ? Qt : Qnil);
    }
  else
    {
      stderr_out ("\n");
      return Qnil;
    }
}

Lisp_Object
clear_echo_area (struct frame *f, Lisp_Object label, int no_restore)
{
  /* This function can call lisp */
  return clear_echo_area_internal (f, label, 0, no_restore);
}

Lisp_Object
clear_echo_area_from_print (struct frame *f, Lisp_Object label, int no_restore)
{
  /* This function can call lisp */
  return clear_echo_area_internal (f, label, 1, no_restore);
}

void
echo_area_append (struct frame *f, const Ibyte *nonreloc, Lisp_Object reloc,
		  Bytecount offset, Bytecount length,
		  Lisp_Object label)
{
  /* This function can call lisp */
  Lisp_Object obj;
  struct gcpro gcpro1;
  Lisp_Object frame;

  /* There is an inlining bug in egcs-20000131 c++ that can be worked
     around as follows:  */
#if defined (__GNUC__) && defined (__cplusplus)
  alloca (4);
#endif

  /* some callers pass in a null string as a way of clearing the echo area.
     check for length == 0 now; if this case, neither nonreloc nor reloc
     may be valid.  */
  if (length == 0)
    return;

  fixup_internal_substring (nonreloc, reloc, offset, &length);

  /* also check it here, in case the string was really blank. */
  if (length == 0)
    return;

  if (!NILP (Ffboundp (Qappend_message)))
    {
      if (STRINGP (reloc) && offset == 0 && length == XSTRING_LENGTH (reloc))
	obj = reloc;
      else
	{
	  if (STRINGP (reloc))
	    nonreloc = XSTRING_DATA (reloc);
	  obj = make_string (nonreloc + offset, length);
	}

      frame = wrap_frame (f);
      GCPRO1 (obj);
      call4 (Qappend_message, label, obj, frame,
	     EQ (label, Qprint) ? Qt : Qnil);
      UNGCPRO;
    }
  else
    {
      if (STRINGP (reloc))
	nonreloc = XSTRING_DATA (reloc);
      write_string_1 (Qexternal_debugging_output, nonreloc + offset, length);
    }
}

void
echo_area_message (struct frame *f, const Ibyte *nonreloc,
		   Lisp_Object reloc, Bytecount offset, Bytecount length,
		   Lisp_Object label)
{
  /* This function can call lisp */
  clear_echo_area (f, label, 1);
  echo_area_append (f, nonreloc, reloc, offset, length, label);
}

int
echo_area_active (struct frame *f)
{
  /* By definition, the echo area is active if the echo-area buffer
     is not empty.  No need to call Lisp code. (Anyway, this function
     is called from redisplay.) */
  struct buffer *echo_buffer = XBUFFER (Vecho_area_buffer);
  return BUF_BEGV (echo_buffer) != BUF_ZV (echo_buffer);
}

Lisp_Object
echo_area_status (struct frame *f)
{
  /* This function can call lisp */
  if (!NILP (Ffboundp (Qcurrent_message_label)))
    {
      Lisp_Object frame = wrap_frame (f);

      return call1 (Qcurrent_message_label, frame);
    }
  else
    return stdout_needs_newline ? Qmessage : Qnil;
}

Lisp_Object
echo_area_contents (struct frame *f)
{
  /* See above.  By definition, the contents of the echo-area buffer
     are the contents of the echo area. */
  return Fbuffer_substring (Qnil, Qnil, Vecho_area_buffer);
}

/* Dump an informative message to the echo area.  This function takes a
   string in internal format. */
void
message_internal (const Ibyte *nonreloc, Lisp_Object reloc,
		  Bytecount offset, Bytecount length)
{
  /* This function can call lisp  */
  if (NILP (Vexecuting_macro))
    echo_area_message (selected_frame (), nonreloc, reloc, offset, length,
		       Qmessage);
}

void
message_append_internal (const Ibyte *nonreloc, Lisp_Object reloc,
			 Bytecount offset, Bytecount length)
{
  /* This function can call lisp  */
  if (NILP (Vexecuting_macro))
    echo_area_append (selected_frame (), nonreloc, reloc, offset, length,
		      Qmessage);
}

/* The next three functions are interfaces to message_internal() that
   take strings in external format.  message() does I18N3 translating
   on the format string; message_no_translate() does not. */

static void
message_1 (const CIbyte *fmt, va_list args)
{
  /* This function can call lisp */
  if (fmt)
    {
      struct gcpro gcpro1;
      /* message_internal() might GC, e.g. if there are after-change-hooks
	 on the echo area buffer */
      Lisp_Object obj = emacs_vsprintf_string (fmt, args);
      GCPRO1 (obj);
      message_internal (0, obj, 0, -1);
      UNGCPRO;
    }
  else
    message_internal (0, Qnil, 0, 0);
}

static void
message_append_1 (const CIbyte *fmt, va_list args)
{
  /* This function can call lisp */
  if (fmt)
    {
      struct gcpro gcpro1;
      /* message_internal() might GC, e.g. if there are after-change-hooks
	 on the echo area buffer */
      Lisp_Object obj = emacs_vsprintf_string (fmt, args);
      GCPRO1 (obj);
      message_append_internal (0, obj, 0, -1);
      UNGCPRO;
    }
  else
    message_append_internal (0, Qnil, 0, 0);
}

void
clear_message (void)
{
  /* This function can call lisp */
  message_internal (0, Qnil, 0, 0);
}

void
message (const char *fmt, ...)
{
  /* This function can call lisp */
  /* I think it's OK to pass the data of Lisp strings as arguments to
     this function.  No GC'ing will occur until the data has already
     been copied. */
  va_list args;

  va_start (args, fmt);
  if (fmt)
    fmt = GETTEXT (fmt);
  message_1 (fmt, args);
  va_end (args);
}

void
message_append (const char *fmt, ...)
{
  /* This function can call lisp */
  va_list args;

  va_start (args, fmt);
  if (fmt)
    fmt = GETTEXT (fmt);
  message_append_1 (fmt, args);
  va_end (args);
}

void
message_no_translate (const char *fmt, ...)
{
  /* This function can call lisp */
  /* I think it's OK to pass the data of Lisp strings as arguments to
     this function.  No GC'ing will occur until the data has already
     been copied. */
  va_list args;

  va_start (args, fmt);
  message_1 (fmt, args);
  va_end (args);
}


/************************************************************************/
/*                            initialization                            */
/************************************************************************/

void
syms_of_minibuf (void)
{
  DEFSYMBOL (Qminibuffer_setup_hook);

  DEFSYMBOL (Qcompletion_ignore_case);

  DEFSUBR (Fminibuffer_depth);
#if 0
  DEFSUBR (Fminibuffer_prompt);
  DEFSUBR (Fminibuffer_prompt_width);
#endif
  DEFSUBR (Fset_minibuffer_preprompt);
  DEFSUBR (Fread_minibuffer_internal);

  DEFSUBR (Ftry_completion);
  DEFSUBR (Fall_completions);

  DEFSYMBOL (Qappend_message);
  DEFSYMBOL (Qclear_message);
  DEFSYMBOL (Qdisplay_message);
  DEFSYMBOL (Qcurrent_message_label);
}

void
reinit_vars_of_minibuf (void)
{
  minibuf_level = 0;
}

void
vars_of_minibuf (void)
{
  reinit_vars_of_minibuf ();

  staticpro (&Vminibuf_prompt);
  Vminibuf_prompt = Qnil;

  /* Added by Jareth Hein (jhod@po.iijnet.or.jp) for input system support */
  staticpro (&Vminibuf_preprompt);
  Vminibuf_preprompt = Qnil;

  DEFVAR_LISP ("minibuffer-setup-hook", &Vminibuffer_setup_hook /*
Normal hook run just after entry to minibuffer.
*/ );
  Vminibuffer_setup_hook = Qnil;

  DEFVAR_BOOL ("completion-ignore-case", &completion_ignore_case /*
Non-nil means don't consider case significant in completion.
*/ );
  completion_ignore_case = 0;

  DEFVAR_LISP ("completion-regexp-list", &Vcompletion_regexp_list /*
List of regexps that should restrict possible completions.
Each completion has to match all regexps in this list.
*/ );
  Vcompletion_regexp_list = Qnil;
}

void
reinit_complex_vars_of_minibuf (void)
{
  /* This function can GC */
#ifdef I18N3
  /* #### This needs to be fixed up so that the gettext() gets called
     at runtime instead of at load time. */
#endif
  Vminibuffer_zero
    = Fget_buffer_create
      (build_string (DEFER_GETTEXT (" *Minibuf-0*")));
  Vecho_area_buffer
    = Fget_buffer_create
      (build_string (DEFER_GETTEXT (" *Echo Area*")));
}

void
complex_vars_of_minibuf (void)
{
  reinit_complex_vars_of_minibuf ();
}