/* Call a Lisp function interactively.
   Copyright (C) 1985, 1986, 1992, 1993, 1994 Free Software Foundation, Inc.
   Copyright (C) 1995, 1996 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: FSF 19.30, Mule 2.0. */

/* Authorship:

   FSF: long ago.
   Mly or JWZ: various changes.
 */

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

#include "buffer.h"
#include "bytecode.h"
#include "commands.h"
#include "events.h"
#include "insdel.h"
#include "window.h"

extern Charcount num_input_chars;

Lisp_Object Vcurrent_prefix_arg;
Lisp_Object Qcall_interactively;
Lisp_Object Vcommand_history;

Lisp_Object Vcommand_debug_status, Qcommand_debug_status;
Lisp_Object Qenable_recursive_minibuffers;

#if 0 /* FSFmacs */
/* Non-nil means treat the mark as active
   even if mark_active is 0.  */
Lisp_Object Vmark_even_if_inactive;
#endif

#if 0 /* ill-conceived */
/* FSF calls Qmouse_leave_buffer_hook at all sorts of random places,
   including a bunch of places in their mouse.el.  If this is
   implemented, it has to be done cleanly. */
Lisp_Object Vmouse_leave_buffer_hook, Qmouse_leave_buffer_hook;
#endif

Lisp_Object QletX, Qsave_excursion;

Lisp_Object Qread_from_minibuffer;
Lisp_Object Qread_file_name;
Lisp_Object Qread_directory_name;
Lisp_Object Qcompleting_read;
Lisp_Object Qread_buffer;
Lisp_Object Qread_function;
Lisp_Object Qread_variable;
Lisp_Object Qread_expression;
Lisp_Object Qread_command;
Lisp_Object Qread_number;
Lisp_Object Qread_string;
Lisp_Object Qevents_to_keys;

#if defined(MULE) || defined(FILE_CODING)
Lisp_Object Qread_coding_system;
Lisp_Object Qread_non_nil_coding_system;
#endif

/* ARGSUSED */
DEFUN ("interactive", Finteractive, 0, UNEVALLED, 0, /*
Specify a way of parsing arguments for interactive use of a function.
For example, write
  (defun foo (arg) "Doc string" (interactive "p") ...use arg...)
to make ARG be the prefix argument when `foo' is called as a command.
The "call" to `interactive' is actually a declaration rather than a function;
 it tells `call-interactively' how to read arguments
 to pass to the function.
When actually called, `interactive' just returns nil.

The argument of `interactive' is usually a string containing a code letter
 followed by a prompt.  (Some code letters do not use I/O to get
 the argument and do not need prompts.)  To prompt for multiple arguments,
 give a code letter, its prompt, a newline, and another code letter, etc.
 Prompts are passed to format, and may use % escapes to print the
 arguments that have already been read.
If the argument is not a string, it is evaluated to get a list of
 arguments to pass to the function.
Just `(interactive)' means pass no args when calling interactively.

Code letters available are:
a -- Function name: symbol with a function definition.
b -- Name of existing buffer.
B -- Name of buffer, possibly nonexistent.
c -- Character.
C -- Command name: symbol with interactive function definition.
d -- Value of point as number.  Does not do I/O.
D -- Directory name.
e -- Last mouse-button or misc-user event that invoked this command.
     If used more than once, the Nth `e' returns the Nth such event.
     Does not do I/O.
f -- Existing file name.
F -- Possibly nonexistent file name.
i -- Always nil, ignore.  Use to skip arguments when interactive.
k -- Key sequence (a vector of events).
K -- Key sequence to be redefined (do not automatically down-case).
m -- Value of mark as number.  Does not do I/O.
n -- Number read using minibuffer.
N -- Prefix arg converted to number, or if none, do like code `n'.
p -- Prefix arg converted to number.  Does not do I/O.
P -- Prefix arg in raw form.  Does not do I/O.
r -- Region: point and mark as 2 numeric args, smallest first.  Does no I/O.
s -- Any string.
S -- Any symbol.
v -- Variable name: symbol that is user-variable-p.
x -- Lisp expression read but not evaluated.
X -- Lisp expression read and evaluated.
z -- Coding system. (Always nil if no Mule support.)
Z -- Coding system, nil if no prefix arg. (Always nil if no Mule support.)
In addition, if the string begins with `*'
 then an error is signaled if the buffer is read-only.
 This happens before reading any arguments.
If the string begins with `@', then the window the mouse is over is selected
 before anything else is done.
If the string begins with `_', then this command will not cause the region
 to be deactivated when it completes; that is, `zmacs-region-stays' will be
 set to t when the command exits successfully.
You may use any of `@', `*' and `_' at the beginning of the string;
 they are processed in the order that they appear.
*/
       (args))
{
  return Qnil;
}

/* Originally, this was just a function -- but `custom' used a
   garden-variety version, so why not make it a subr?  */
/* #### Move it to another file! */
DEFUN ("quote-maybe", Fquote_maybe, 1, 1, 0, /*
Quote EXPR if it is not self quoting.
*/
       (expr))
{
  return ((NILP (expr)
	   || EQ (expr, Qt)
	   || INTP (expr)
	   || FLOATP (expr)
	   || CHARP (expr)
	   || STRINGP (expr)
	   || VECTORP (expr)
	   || KEYWORDP (expr)
	   || BIT_VECTORP (expr)
	   || (CONSP (expr) && EQ (XCAR (expr), Qlambda)))
	  ? expr : list2 (Qquote, expr));
}

/* Modify EXPR by quotifying each element (except the first).  */
static Lisp_Object
quotify_args (Lisp_Object expr)
{
  Lisp_Object tail;
  Lisp_Cons *ptr;
  for (tail = expr; CONSP (tail); tail = ptr->cdr)
    {
      ptr = XCONS (tail);
      ptr->car = Fquote_maybe (ptr->car);
    }
  return expr;
}

static Bufpos
check_mark (void)
{
  Lisp_Object tem;

  if (zmacs_regions && !zmacs_region_active_p)
    error ("The region is not active now");

  tem = Fmarker_buffer (current_buffer->mark);
  if (NILP (tem) || (XBUFFER (tem) != current_buffer))
    error ("The mark is not set now");

  return marker_position (current_buffer->mark);
}

static Lisp_Object
callint_prompt (const Bufbyte *prompt_start, Bytecount prompt_length,
                const Lisp_Object *args, int nargs)
{
  Lisp_Object s = make_string (prompt_start, prompt_length);
  struct gcpro gcpro1;

  /* Fformat no longer smashes its arg vector, so no need to copy it. */

  if (!strchr ((char *) XSTRING_DATA (s), '%'))
    return s;
  GCPRO1 (s);
  RETURN_UNGCPRO (emacs_doprnt_string_lisp (0, s, 0, nargs, args));
}

/* `lambda' for RECORD-FLAG is an XEmacs addition. */

DEFUN ("call-interactively", Fcall_interactively, 1, 3, 0, /*
Call FUNCTION, reading args according to its interactive calling specs.
Return the value FUNCTION returns.
The function contains a specification of how to do the argument reading.
In the case of user-defined functions, this is specified by placing a call
to the function `interactive' at the top level of the function body.
See `interactive'.

If optional second arg RECORD-FLAG is the symbol `lambda', the interactive
calling arguments for FUNCTION are read and returned as a list,
but the function is not called on them.

If RECORD-FLAG is `t' then unconditionally put this command in the
command-history.  Otherwise, this is done only if an arg is read using
the minibuffer.

The argument KEYS specifies the value to use instead of (this-command-keys)
when reading the arguments.
*/
       (function, record_flag, keys))
{
  /* This function can GC */
  int speccount = specpdl_depth ();
  Lisp_Object prefix;

  Lisp_Object fun;
  Lisp_Object specs = Qnil;
#ifdef IT_SEEMS_THAT_MLY_DOESNT_LIKE_THIS
  Lisp_Object enable;
#endif
  /* If SPECS is a string, we reset prompt_data to string_data
   * (XSTRING (specs)) every time a GC might have occurred */
  const char *prompt_data = 0;
  int prompt_index = 0;
  int argcount;
  int set_zmacs_region_stays = 0;
  int mouse_event_count = 0;

  if (!NILP (keys))
    {
      int i, len;

      CHECK_VECTOR (keys);
      len = XVECTOR_LENGTH (keys);
      for (i = 0; i < len; i++)
	CHECK_LIVE_EVENT (XVECTOR_DATA (keys)[i]);
    }

  /* Save this now, since use of minibuffer will clobber it. */
  prefix = Vcurrent_prefix_arg;

 retry:

#ifdef IT_SEEMS_THAT_MLY_DOESNT_LIKE_THIS
  /* Marginal kludge.  Use an evaluated interactive spec instead of this! */
  if (SYMBOLP (function))
    enable = Fget (function, Qenable_recursive_minibuffers, Qnil);
#endif

  fun = indirect_function (function, 1);

  /* Decode the kind of function.  Either handle it and return,
     or go to `lose' if not interactive, or go to `retry'
     to specify a different function, or set either PROMPT_DATA or SPECS. */

  if (SUBRP (fun))
    {
      prompt_data = XSUBR (fun)->prompt;
      if (!prompt_data)
	{
	lose:
	  function = wrong_type_argument (Qcommandp, function);
	  goto retry;
	}
#if 0 /* FSFmacs */ /* Huh? Where is this used? */
      if ((EMACS_INT) prompt_data == 1)
	/* Let SPECS (which is nil) be used as the args.  */
	prompt_data = 0;
#endif
    }
  else if (COMPILED_FUNCTIONP (fun))
    {
      Lisp_Compiled_Function *f = XCOMPILED_FUNCTION (fun);
      if (! f->flags.interactivep)
        goto lose;
      specs = compiled_function_interactive (f);
    }
  else if (!CONSP (fun))
    goto lose;
  else
    {
      Lisp_Object funcar = Fcar (fun);

      if (EQ (funcar, Qautoload))
	{
	  struct gcpro gcpro1;
	  GCPRO1 (prefix);
	  /* do_autoload GCPROs both arguments */
	  do_autoload (fun, function);
	  UNGCPRO;
	  goto retry;
	}
      else if (EQ (funcar, Qlambda))
	{
	  specs = Fassq (Qinteractive, Fcdr (Fcdr (fun)));
	  if (NILP (specs))
	    goto lose;
	  specs = Fcar (Fcdr (specs));
	}
      else
	goto lose;
    }

  /* FSFmacs makes an alloca() copy of prompt_data here.
     We're more intelligent about this and just reset prompt_data
     as necessary. */
  /* If either specs or prompt_data is set to a string, use it.  */
  if (!STRINGP (specs) && prompt_data == 0)
    {
      struct gcpro gcpro1, gcpro2, gcpro3;
      int i = num_input_chars;
      Lisp_Object input = specs;

      GCPRO3 (function, specs, input);
      /* Compute the arg values using the user's expression.  */
      specs = Feval (specs);
      if (EQ (record_flag, Qlambda)) /* XEmacs addition */
	{
	  UNGCPRO;
	  return specs;
	}
      if (!NILP (record_flag) || i != num_input_chars)
	{
	  /* We should record this command on the command history.  */
	  /* #### The following is too specific; should have general
	     mechanism for doing this. */
	  Lisp_Object values, car;
	  /* Make a copy of the list of values, for the command history,
	     and turn them into things we can eval.  */
	  values = quotify_args (Fcopy_sequence (specs));
	  /* If the list of args was produced with an explicit call to `list',
	     look for elements that were computed with (region-beginning)
	     or (region-end), and put those expressions into VALUES
	     instead of the present values.  */
	  if (CONSP (input))
	    {
	      car = XCAR (input);
	      /* Skip through certain special forms.  */
	      while (EQ (car, Qlet) || EQ (car, QletX)
		     || EQ (car, Qsave_excursion))
		{
		  while (CONSP (XCDR (input)))
		    input = XCDR (input);
		  input = XCAR (input);
		  if (!CONSP (input))
		    break;
		  car = XCAR (input);
		}
	      if (EQ (car, Qlist))
		{
		  Lisp_Object intail, valtail;
		  for (intail = Fcdr (input), valtail = values;
		       CONSP (valtail);
		       intail = Fcdr (intail), valtail = Fcdr (valtail))
		    {
		      Lisp_Object elt;
		      elt = Fcar (intail);
		      if (CONSP (elt))
			{
			  Lisp_Object eltcar = Fcar (elt);
			  if (EQ (eltcar, Qpoint) ||
			      EQ (eltcar, Qmark)  ||
			      EQ (eltcar, Qregion_beginning) ||
			      EQ (eltcar, Qregion_end))
			    Fsetcar (valtail, Fcar (intail));
			}
		    }
		}
	    }
	  Vcommand_history
	    = Fcons (Fcons (function, values), Vcommand_history);
	}
      single_console_state ();
      RETURN_UNGCPRO (apply1 (fun, specs));
    }

  /* Here if function specifies a string to control parsing the defaults */

#ifdef I18N3
  /* Translate interactive prompt. */
  if (STRINGP (specs))
    {
      Lisp_Object domain = Qnil;
      if (COMPILED_FUNCTIONP (fun))
	domain = compiled_function_domain (XCOMPILED_FUNCTION (fun));
      if (NILP (domain))
	specs = Fgettext (specs);
      else
	specs = Fdgettext (domain, specs);
    }
  else if (prompt_data)
    /* We do not have to worry about domains in this case because
       prompt_data is non-nil only for built-in functions, which
       always use the default domain. */
    prompt_data = gettext (prompt_data);
#endif

  /* Handle special starting chars `*' and `@' and `_'.  */
  /* Note that `+' is reserved for user extensions.  */
  prompt_index = 0;
  {
    struct gcpro gcpro1, gcpro2;
    GCPRO2 (function, specs);

    for (;;)
      {
	if (STRINGP (specs))
	  prompt_data = (const char *) XSTRING_DATA (specs);

	if (prompt_data[prompt_index] == '+')
	  error ("`+' is not used in `interactive' for ordinary commands");
	else if (prompt_data[prompt_index] == '*')
	  {
	    prompt_index++;
	    if (!NILP (current_buffer->read_only))
	      barf_if_buffer_read_only (current_buffer, -1, -1);
	  }
	else if (prompt_data[prompt_index] == '@')
	  {
	    Lisp_Object event;
	    prompt_index++;

	    if (!NILP (keys))
	      event = extract_vector_nth_mouse_event (keys, 0);
	    else
#if 0
	      event = extract_this_command_keys_nth_mouse_event (0);
#else
	      /* Doesn't work; see below */
	      event = Vcurrent_mouse_event;
#endif
	    if (! NILP (event))
	      {
		Lisp_Object window = Fevent_window (event);
		if (!NILP (window))
		  {
		    if (MINI_WINDOW_P (XWINDOW (window))
			&& ! (minibuf_level > 0 && EQ (window,
						       minibuf_window)))
		      error ("Attempt to select inactive minibuffer window");

#if 0 /* unclean! see event-stream.c */
		    /* If the current buffer wants to clean up, let it.  */
		    if (!NILP (Vmouse_leave_buffer_hook))
		      run_hook (Qmouse_leave_buffer_hook);
#endif

		    Fselect_window (window, Qnil);
		  }
	      }
	  }
	else if (prompt_data[prompt_index] == '_')
	  {
	    prompt_index++;
	    set_zmacs_region_stays = 1;
	  }
	else
	  {
	    UNGCPRO;
	    break;
	  }
      }
  }

  /* Count the number of arguments the interactive spec would have
     us give to the function.  */
  argcount = 0;
  {
    const char *tem;
    for (tem = prompt_data + prompt_index; *tem; )
      {
	/* 'r' specifications ("point and mark as 2 numeric args")
	   produce *two* arguments.  */
	if (*tem == 'r')
	  argcount += 2;
	else
	  argcount += 1;
	tem = (const char *) strchr (tem + 1, '\n');
	if (!tem)
	  break;
	tem++;
      }
  }

#ifdef IT_SEEMS_THAT_MLY_DOESNT_LIKE_THIS
  if (!NILP (enable))
    specbind (Qenable_recursive_minibuffers, Qt);
#endif

  if (argcount == 0)
    {
      /* Interactive function or no arguments; just call it */
      if (EQ (record_flag, Qlambda))
	return Qnil;
      if (!NILP (record_flag))
	{
	  Vcommand_history = Fcons (list1 (function), Vcommand_history);
	}
      specbind (Qcommand_debug_status, Qnil);
      /* XEmacs: was fun = call0 (fun), but that's backtraced wrong */
      {
	struct gcpro gcpro1;

	GCPRO1 (fun);
	fun = Ffuncall (1, &fun);
	UNGCPRO;
      }
      if (set_zmacs_region_stays)
	zmacs_region_stays = 1;
      return unbind_to (speccount, fun);
    }

  /* Read interactive arguments */
  {
    /* args[-1] is the function to call */
    /* args[n] is the n'th argument to the function */
    int alloca_size = (1	/* function to call */
                       + argcount /* actual arguments */
                       + argcount /* visargs */
                       + argcount /* varies */
                       );
    Lisp_Object *args = alloca_array (Lisp_Object, alloca_size) + 1;
    /* visargs is an array of either Qnil or user-friendlier versions (often
     *  strings) of previous arguments, to use in prompts for successive
     *  arguments.  ("Often strings" because emacs didn't used to have
     *  format %S and prin1-to-string.) */
    Lisp_Object *visargs = args + argcount;
    /* If varies[i] is non-null, the i'th argument shouldn't just have
       its value in this call quoted in the command history.  It should be
       recorded as a call to the function named varies[i]]. */
    Lisp_Object *varies = visargs + argcount;
    int arg_from_tty = 0;
    REGISTER int argnum;
    struct gcpro gcpro1, gcpro2;

    args[-1] = function;
    for (argnum = 0; argnum < alloca_size - 1; argnum++)
      args[argnum] = Qnil;

    /* Must GC-protect args[-1] (ie function) because Ffuncall doesn't */
    /* `function' itself isn't GC-protected -- use args[-1] from here
       (actually, doesn't matter since Emacs GC doesn't relocate, sigh) */
    GCPRO2 (prefix, args[-1]);
    gcpro2.nvars = alloca_size;

    for (argnum = 0; ; argnum++)
      {
	const char *prompt_start = prompt_data + prompt_index + 1;
	const char *prompt_limit = (const char *) strchr (prompt_start, '\n');
	int prompt_length;
	prompt_length = ((prompt_limit)
			 ? (prompt_limit - prompt_start)
			 : (int) strlen (prompt_start));
	if (prompt_limit && prompt_limit[1] == 0)
	  {
	    prompt_limit = 0;	/* "sfoo:\n" -- strip tailing return */
	    prompt_length -= 1;
	  }
	/* This uses `visargs' instead of `args' so that global-set-key
	   prompts with "Set key C-x C-f to command: "instead of printing
	   event objects in there.
	 */
#define PROMPT() callint_prompt ((const Bufbyte *) prompt_start, prompt_length, visargs, argnum)
	switch (prompt_data[prompt_index])
	  {
	  case 'a':		/* Symbol defined as a function */
	    {
	      Lisp_Object tem = call1 (Qread_function, PROMPT ());
	      args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }
	  case 'b':   		/* Name of existing buffer */
	    {
	      Lisp_Object def = Fcurrent_buffer ();
	      if (EQ (Fselected_window (Qnil), minibuf_window))
		def = Fother_buffer (def, Qnil, Qnil);
              /* read-buffer returns a buffer name, not a buffer! */
	      args[argnum] = call3 (Qread_buffer, PROMPT (), def,
				    Qt);
	      arg_from_tty = 1;
	      break;
	    }
	  case 'B':		/* Name of buffer, possibly nonexistent */
	    {
              /* read-buffer returns a buffer name, not a buffer! */
	      args[argnum] = call2 (Qread_buffer, PROMPT (),
				    Fother_buffer (Fcurrent_buffer (), Qnil,
						   Qnil));
	      arg_from_tty = 1;
	      break;
	    }
	  case 'c':		/* Character */
	    {
              Lisp_Object tem;
	      int shadowing_speccount = specpdl_depth ();

	      specbind (Qcursor_in_echo_area, Qt);
	      message ("%s", XSTRING_DATA (PROMPT ()));
	      tem = (call0 (Qread_char));
              args[argnum] = tem;
              /* visargs[argnum] = Fsingle_key_description (tem); */
	      /* FSF has visargs[argnum] = Fchar_to_string (tem); */

	      unbind_to (shadowing_speccount, Qnil);

	      /* #### `C-x / a' should not leave the prompt in the minibuffer.
		 This isn't the right fix, because (message ...) (read-char)
		 shouldn't leave the message there either... */
	      clear_message ();

	      arg_from_tty = 1;
	      break;
	    }
	  case 'C':		/* Command: symbol with interactive function */
	    {
	      Lisp_Object tem = call1 (Qread_command, PROMPT ());
	      args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }
	  case 'd':		/* Value of point.  Does not do I/O.  */
	    {
	      args[argnum] = Fcopy_marker (current_buffer->point_marker, Qt);
	      varies[argnum] = Qpoint;
	      break;
	    }
	  case 'e':
	    {
	      Lisp_Object event;

	      if (!NILP (keys))
		event = extract_vector_nth_mouse_event (keys,
							mouse_event_count);
	      else
#if 0
	      /* This doesn't quite work because this-command-keys
		 behaves in utterly counterintuitive ways.  Sometimes
		 it retrieves an event back in the future, e.g. when
		 one command invokes another command and both are
		 invoked with the mouse. */
		event = (extract_this_command_keys_nth_mouse_event
			 (mouse_event_count));
#else
	        event = Vcurrent_mouse_event;
#endif

	      if (NILP (event))
		error ("%s must be bound to a mouse or misc-user event",
		       (SYMBOLP (function)
			? (char *) string_data (XSYMBOL (function)->name)
			: "command"));
	      args[argnum] = event;
	      mouse_event_count++;
	      break;
	    }
	  case 'D':		/* Directory name. */
	    {
	      args[argnum] = call4 (Qread_directory_name, PROMPT (),
				    Qnil, /* dir */
				    current_buffer->directory, /* default */
				    Qt /* must-match */
				    );
	      arg_from_tty = 1;
	      break;
	    }
	  case 'f':		/* Existing file name. */
	    {
	      Lisp_Object tem = call4 (Qread_file_name, PROMPT (),
				       Qnil, /* dir */
				       Qnil, /* default */
				       Qzero /* must-match */
				       );
              args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }
	  case 'F':		/* Possibly nonexistent file name. */
	    {
	      args[argnum] = call4 (Qread_file_name, PROMPT (),
				    Qnil, /* dir */
				    Qnil, /* default */
				    Qnil /* must-match */
				    );
	      arg_from_tty = 1;
	      break;
	    }
	  case 'i':		/* Ignore: always nil. Use to skip arguments. */
            {
              args[argnum] = Qnil;
              break;
            }
	  case 'k':		/* Key sequence (vector of events) */
	    {
	      struct gcpro ngcpro1;
	      Lisp_Object tem;
	      Lisp_Object key_prompt = PROMPT ();

	      NGCPRO1(key_prompt);
	      tem = Fread_key_sequence (key_prompt, Qnil, Qnil);
	      NUNGCPRO;

	      visargs[argnum] = Fkey_description (tem);
	      /* The following makes `describe-key' not work with
		 extent-local keymaps and such; and anyway, it's
		 contrary to the documentation. */
	      /* args[argnum] = call1 (Qevents_to_keys, tem); */
	      args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }
	  case 'K':		/* Key sequence (vector of events),
				   no automatic downcasing */
	    {
	      struct gcpro ngcpro1;
	      Lisp_Object tem;
	      Lisp_Object key_prompt = PROMPT ();

	      NGCPRO1(key_prompt);
	      tem = Fread_key_sequence (key_prompt, Qnil, Qt);
	      NUNGCPRO;

	      visargs[argnum] = Fkey_description (tem);
	      /* The following makes `describe-key' not work with
		 extent-local keymaps and such; and anyway, it's
		 contrary to the documentation. */
	      /* args[argnum] = call1 (Qevents_to_keys, tem); */
	      args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }

	  case 'm':		/* Value of mark.  Does not do I/O.  */
	    {
	      args[argnum] = current_buffer->mark;
	      varies[argnum] = Qmark;
	      break;
	    }
	  case 'n':		/* Read number from minibuffer.  */
	    {
	    read_number:
	      args[argnum] = call2 (Qread_number, PROMPT (), Qnil);
	      /* numbers are too boring to go on command history */
	      /* arg_from_tty = 1; */
              break;
            }
	  case 'N':		/* Prefix arg, else number from minibuffer */
	    {
	      if (NILP (prefix))
		goto read_number;
              else
                goto prefix_value;
	    }
	  case 'P':		/* Prefix arg in raw form.  Does no I/O.  */
	    {
	      args[argnum] = prefix;
	      break;
	    }
	  case 'p':		/* Prefix arg converted to number.  No I/O. */
            {
            prefix_value:
              {
                Lisp_Object tem = Fprefix_numeric_value (prefix);
                args[argnum] = tem;
              }
              break;
            }
	  case 'r':		/* Region, point and mark as 2 args. */
	    {
	      Bufpos tem = check_mark ();
	      args[argnum] = (BUF_PT (current_buffer) < tem
			      ? Fcopy_marker (current_buffer->point_marker, Qt)
			      : current_buffer->mark);
	      varies[argnum] = Qregion_beginning;
	      args[++argnum] = (BUF_PT (current_buffer) > tem
				? Fcopy_marker (current_buffer->point_marker,
						Qt)
				: current_buffer->mark);
	      varies[argnum] = Qregion_end;
	      break;
	    }
	  case 's':		/* String read via minibuffer.  */
	    {
	      args[argnum] = call1 (Qread_string, PROMPT ());
	      arg_from_tty = 1;
	      break;
	    }
	  case 'S':		/* Any symbol.  */
	    {
	      visargs[argnum] = Qnil;
	      for (;;)
		{
		  Lisp_Object tem = call5 (Qcompleting_read,
					   PROMPT (),
					   Vobarray,
					   Qnil,
					   Qnil,
					   /* nil, or prev attempt */
					   visargs[argnum]);
		  visargs[argnum] = tem;
		  /* I could use condition-case with this loser, but why bother?
		   * tem = Fread (tem); check-symbol-p;
		   */
		  tem = Fintern (tem, Qnil);
		  args[argnum] = tem;
		  if (string_length (XSYMBOL (tem)->name) > 0)
		    /* Don't accept the empty-named symbol.  If the loser
		       really wants this s/he can call completing-read
                       directly */
		    break;
		}
	      arg_from_tty = 1;
	      break;
	    }
	  case 'v':		/* Variable name: user-variable-p symbol */
	    {
	      Lisp_Object tem = call1 (Qread_variable, PROMPT ());
	      args[argnum] = tem;
	      arg_from_tty = 1;
	      break;
	    }
	  case 'x':		/* Lisp expression read but not evaluated */
	    {
	      args[argnum] = call1 (Qread_expression, PROMPT ());
              /* visargs[argnum] = Fprin1_to_string (args[argnum], Qnil); */
	      arg_from_tty = 1;
	      break;
	    }
	  case 'X':		/* Lisp expression read and evaluated */
	    {
	      Lisp_Object tem = call1 (Qread_expression, PROMPT ());
	      /* visargs[argnum] = Fprin1_to_string (tem, Qnil); */
	      args[argnum] = Feval (tem);
	      arg_from_tty = 1;
	      break;
	    }
	  case 'Z':		/* Coding-system symbol or nil if no prefix */
	    {
#if defined(MULE) || defined(FILE_CODING)
	      if (NILP (prefix))
		{
		  args[argnum] = Qnil;
		}
	      else
		{
		  args[argnum] =
		    call1 (Qread_non_nil_coding_system, PROMPT ());
		  arg_from_tty = 1;
		}
#else
	      args[argnum] = Qnil;
#endif
	      break;
	    }
	  case 'z':		/* Coding-system symbol */
	    {
#if defined(MULE) || defined(FILE_CODING)
	      args[argnum] = call1 (Qread_coding_system, PROMPT ());
	      arg_from_tty = 1;
#else
	      args[argnum] = Qnil;
#endif
	      break;
	    }

	    /* We have a case for `+' so we get an error
	       if anyone tries to define one here.  */
	  case '+':
	  default:
	    {
	      error ("Invalid `interactive' control letter \"%c\" (#o%03o).",
		     prompt_data[prompt_index],
		     prompt_data[prompt_index]);
	    }
	  }
#undef PROMPT
	if (NILP (visargs[argnum]))
	  visargs[argnum] = args[argnum];

	if (!prompt_limit)
	  break;
	if (STRINGP (specs))
	  prompt_data = (const char *) XSTRING_DATA (specs);
	prompt_index += prompt_length + 1 + 1; /* +1 to skip spec, +1 for \n */
      }
    unbind_to (speccount, Qnil);

    QUIT;

    if (EQ (record_flag, Qlambda))
      {
	RETURN_UNGCPRO (Flist (argcount, args));
      }

    if (arg_from_tty || !NILP (record_flag))
      {
        /* Reuse visargs as a temporary for constructing the command history */
	for (argnum = 0; argnum < argcount; argnum++)
	  {
	    if (!NILP (varies[argnum]))
	      visargs[argnum] = list1 (varies[argnum]);
	    else
	      visargs[argnum] = Fquote_maybe (args[argnum]);
	  }
	Vcommand_history = Fcons (Fcons (args[-1], Flist (argcount, visargs)),
				  Vcommand_history);
      }

    /* If we used a marker to hold point, mark, or an end of the region,
       temporarily, convert it to an integer now.  */
    for (argnum = 0; argnum < argcount; argnum++)
      if (!NILP (varies[argnum]))
	XSETINT (args[argnum], marker_position (args[argnum]));

    single_console_state ();
    specbind (Qcommand_debug_status, Qnil);
    fun = Ffuncall (argcount + 1, args - 1);
    UNGCPRO;
    if (set_zmacs_region_stays)
      zmacs_region_stays = 1;
    return unbind_to (speccount, fun);
  }
}

DEFUN ("prefix-numeric-value", Fprefix_numeric_value, 1, 1, 0, /*
Return numeric meaning of raw prefix argument RAW.
A raw prefix argument is what you get from `(interactive "P")'.
Its numeric meaning is what you would get from `(interactive "p")'.
*/
       (raw))
{
  if (NILP (raw))
    return make_int (1);
  if (EQ (raw, Qminus))
    return make_int (-1);
  if (INTP (raw))
    return raw;
  if (CONSP (raw) && INTP (XCAR (raw)))
    return XCAR (raw);

  return make_int (1);
}

void
syms_of_callint (void)
{
  defsymbol (&Qcall_interactively, "call-interactively");
  defsymbol (&Qread_from_minibuffer, "read-from-minibuffer");
  defsymbol (&Qcompleting_read, "completing-read");
  defsymbol (&Qread_file_name, "read-file-name");
  defsymbol (&Qread_directory_name, "read-directory-name");
  defsymbol (&Qread_string, "read-string");
  defsymbol (&Qread_buffer, "read-buffer");
  defsymbol (&Qread_variable, "read-variable");
  defsymbol (&Qread_function, "read-function");
  defsymbol (&Qread_command, "read-command");
  defsymbol (&Qread_number, "read-number");
  defsymbol (&Qread_expression, "read-expression");
#if defined(MULE) || defined(FILE_CODING)
  defsymbol (&Qread_coding_system, "read-coding-system");
  defsymbol (&Qread_non_nil_coding_system, "read-non-nil-coding-system");
#endif
  defsymbol (&Qevents_to_keys, "events-to-keys");
  defsymbol (&Qcommand_debug_status, "command-debug-status");
  defsymbol (&Qenable_recursive_minibuffers, "enable-recursive-minibuffers");

  defsymbol (&QletX, "let*");
  defsymbol (&Qsave_excursion, "save-excursion");
#if 0 /* ill-conceived */
  defsymbol (&Qmouse_leave_buffer_hook, "mouse-leave-buffer-hook");
#endif

  DEFSUBR (Finteractive);
  DEFSUBR (Fquote_maybe);
  DEFSUBR (Fcall_interactively);
  DEFSUBR (Fprefix_numeric_value);
}

void
vars_of_callint (void)
{
  DEFVAR_LISP ("current-prefix-arg", &Vcurrent_prefix_arg /*
The value of the prefix argument for this editing command.
It may be a number, or the symbol `-' for just a minus sign as arg,
or a list whose car is a number for just one or more C-U's
or nil if no argument has been specified.
This is what `(interactive "P")' returns.
*/ );
  Vcurrent_prefix_arg = Qnil;

  DEFVAR_LISP ("command-history", &Vcommand_history /*
List of recent commands that read arguments from terminal.
Each command is represented as a form to evaluate.
*/ );
  Vcommand_history = Qnil;

  DEFVAR_LISP ("command-debug-status", &Vcommand_debug_status /*
Debugging status of current interactive command.
Bound each time `call-interactively' is called;
may be set by the debugger as a reminder for itself.
*/ );
  Vcommand_debug_status = Qnil;

#if 0 /* FSFmacs */
  xxDEFVAR_LISP ("mark-even-if-inactive", &Vmark_even_if_inactive /*
*Non-nil means you can use the mark even when inactive.
This option makes a difference in Transient Mark mode.
When the option is non-nil, deactivation of the mark
turns off region highlighting, but commands that use the mark
behave as if the mark were still active.
*/ );
  Vmark_even_if_inactive = Qnil;
#endif

#if 0 /* Doesn't work and is totally ill-conceived anyway. */
  xxDEFVAR_LISP ("mouse-leave-buffer-hook", &Vmouse_leave_buffer_hook /*
Hook to run when about to switch windows with a mouse command.
Its purpose is to give temporary modes such as Isearch mode
a way to turn themselves off when a mouse command switches windows.
*/ );
  Vmouse_leave_buffer_hook = Qnil;
#endif
}