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callint.c
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1991-12-02
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513 lines
/* Call a Lisp function interactively.
Copyright (C) 1985, 1986 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 1, or (at your option)
any later version.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include "lisp.h"
#include "buffer.h"
#include "commands.h"
#include "window.h"
Lisp_Object global_map;
extern int num_input_chars;
Lisp_Object Vprefix_arg, Vcurrent_prefix_arg, Qminus;
Lisp_Object Qcall_interactively;
Lisp_Object Vcommand_history;
extern Lisp_Object ml_apply ();
extern Lisp_Object Fread_buffer (), Fread_key_sequence (), Fread_file_name ();
/* This comment supplies the doc string for interactive,
for make-docfile to see. We cannot put this in the real DEFUN
due to limits in the Unix cpp.
DEFUN ("interactive", Ffoo, Sfoo, 0, 0, 0,
"Specify a way of parsing arguments for interactive use of a function.\n\
For example, write\n\
(defun fun (arg) \"Doc string\" (interactive \"p\") ...use arg...)\n\
to make arg be the prefix numeric argument when foo is called as a command.\n\
This is actually a declaration rather than a function;\n\
it tells call-interactively how to read arguments\n\
to pass to the function.\n\
When actually called, interactive just returns nil.\n\
\n\
The argument of interactive is usually a string containing a code letter\n\
followed by a prompt. (Some code letters do not use I/O to get\n\
the argument and do not need prompts.) To prompt for multiple arguments,\n\
give a code letter, its prompt, a newline, and another code letter, etc.\n\
If the argument is not a string, it is evaluated to get a list of\n\
arguments to pass to the function.\n\
Just (interactive) means pass no args when calling interactively.\n\
\nCode letters available are:\n\
a -- Function name: symbol with a function definition.\n\
b -- Name of existing buffer.\n\
B -- Name of buffer, possibly nonexistent.\n\
c -- Character.\n\
C -- Command name: symbol with interactive function definition.\n\
d -- Value of point as number. Does not do I/O.\n\
D -- Directory name.\n\
f -- Existing file name.\n\
F -- Possibly nonexistent file name.\n\
k -- Key sequence (string).\n\
m -- Value of mark as number. Does not do I/O.\n\
n -- Number read using minibuffer.\n\
N -- Prefix arg converted to number, or if none, do like code `n'.\n\
p -- Prefix arg converted to number. Does not do I/O.\n\
P -- Prefix arg in raw form. Does not do I/O.\n\
r -- Region: point and mark as 2 numeric args, smallest first. Does no I/O.\n\
s -- Any string.\n\
S -- Any symbol.\n\
v -- Variable name: symbol that is user-variable-p.\n\
x -- Lisp expression read but not evaluated.\n\
X -- Lisp expression read and evaluated.\n\
In addition, if the first character of the string is '*' then an error is\n\
signaled if the buffer is read-only.\n\
This happens before reading any arguments.")
*/
/* ARGSUSED */
DEFUN ("interactive", Finteractive, Sinteractive, 0, UNEVALLED, 0,
0 /* See immediately above */)
(args)
Lisp_Object args;
{
return Qnil;
}
/* Quotify EXP: if EXP is constant, return it.
If EXP is not constant, return (quote EXP). */
Lisp_Object
quotify_arg (exp)
register Lisp_Object exp;
{
if (XTYPE (exp) != Lisp_Int && XTYPE (exp) != Lisp_String
&& !NULL (exp) && !EQ (exp, Qt))
return Fcons (Qquote, Fcons (exp, Qnil));
return exp;
}
/* Modify EXP by quotifying each element (except the first). */
Lisp_Object
quotify_args (exp)
Lisp_Object exp;
{
register Lisp_Object tail;
register struct Lisp_Cons *ptr;
for (tail = exp; CONSP (tail); tail = ptr->cdr)
{
ptr = XCONS (tail);
ptr->car = quotify_arg (ptr->car);
}
return exp;
}
char *callint_argfuns[]
= {"", "point", "mark", "region-beginning", "region-end"};
static void
check_mark ()
{
Lisp_Object tem = Fmarker_buffer (current_buffer->mark);
if (NULL (tem) || (XBUFFER (tem) != current_buffer))
error ("The mark is not set now");
}
DEFUN ("call-interactively", Fcall_interactively, Scall_interactively, 1, 2, 0,
"Call FUNCTION, reading args according to its interactive calling specs.\n\
The function contains a specification of how to do the argument reading.\n\
In the case of user-defined functions, this is specified by placing a call\n\
to the function `interactive' at the top level of the function body.\n\
See `interactive'.\n\
\n\
Optional second arg RECORD-FLAG non-nil\n\
means unconditionally put this command in the command-history.\n\
Otherwise, this is done only if an arg is read using the minibuffer.")
(function, record)
Lisp_Object function, record;
{
Lisp_Object *args, *visargs;
unsigned char **argstrings;
Lisp_Object fun;
Lisp_Object funcar;
Lisp_Object specs;
Lisp_Object teml;
Lisp_Object prefix_arg;
unsigned char *string;
unsigned char *tem;
int *varies;
register int i, j;
int count, foo;
char prompt[100];
char prompt1[100];
char *tem1;
int arg_from_tty = 0;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
extern char *index ();
/* Save this now, since use ofminibuffer will clobber it. */
prefix_arg = Vcurrent_prefix_arg;
retry:
fun = function;
while (XTYPE (fun) == Lisp_Symbol && !EQ (fun, Qunbound)) fun = XSYMBOL (fun)->function;
if (XTYPE (fun) == Lisp_Subr)
{
string = (unsigned char *) XSUBR (fun)->prompt;
if (!string)
{
lose:
function = wrong_type_argument (Qcommandp, function, 0);
goto retry;
}
else if ((int) string == 1)
return call0 (function);
}
else if (!CONSP (fun))
goto lose;
else if (funcar = Fcar (fun), EQ (funcar, Qautoload))
{
GCPRO2 (function, prefix_arg);
do_autoload (fun, function);
UNGCPRO;
goto retry;
}
else if (EQ (funcar, Qlambda))
{
specs = Fassq (Qinteractive, Fcdr (Fcdr (fun)));
if (NULL (specs))
goto lose;
specs = Fcar (Fcdr (specs));
if (XTYPE (specs) == Lisp_String)
string = XSTRING (specs)->data;
else
{
i = num_input_chars;
specs = Feval (specs);
if (i != num_input_chars || !NULL (record))
Vcommand_history
= Fcons (Fcons (function, quotify_args (Fcopy_sequence (specs))),
Vcommand_history);
return apply1 (function, specs);
}
}
else if (EQ (funcar, Qmocklisp))
return ml_apply (fun, Qinteractive);
else
goto lose;
/* Here if function specifies a string to control parsing the defaults */
/* First character '*' means barf if buffer read-only */
if (*string == '*')
{ string++;
if (!NULL (current_buffer->read_only))
Fbarf_if_buffer_read_only ();
}
tem = string;
for (j = 0; *tem; j++)
{
if (*tem == 'r') j++;
tem = (unsigned char *) index (tem, '\n');
if (tem) tem++;
else tem = (unsigned char *) "";
}
count = j;
args = (Lisp_Object *) alloca ((count + 1) * sizeof (Lisp_Object));
visargs = (Lisp_Object *) alloca ((count + 1) * sizeof (Lisp_Object));
argstrings = (unsigned char **) alloca ((count + 1) * sizeof (char *));
varies = (int *) alloca ((count + 1) * sizeof (int));
for (i = 0; i < (count + 1); i++)
{
args[i] = Qnil;
visargs[i] = Qnil;
varies[i] = 0;
}
GCPRO4 (prefix_arg, function, *args, *visargs);
gcpro3.nvars = (count + 1);
gcpro4.nvars = (count + 1);
tem = string;
for (i = 1; *tem; i++)
{
strncpy (prompt1, tem + 1, sizeof prompt1 - 1);
prompt1[sizeof prompt1 - 1] = 0;
tem1 = index (prompt1, '\n');
if (tem1) *tem1 = 0;
/* Fill argstrings with a vector of C strings
corresponding to the Lisp strings in visargs. */