src/callint.c

   1 /* Call a Lisp function interactively.
   2    Copyright (C) 1985-1986, 1993-1995, 1997, 2000-2015 Free Software
   3    Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include <config.h>
  22
  23 #include "lisp.h"
  24 #include "character.h"
  25 #include "buffer.h"
  26 #include "commands.h"
  27 #include "keyboard.h"
  28 #include "window.h"
  29 #include "keymap.h"
  30
  31 static Lisp_Object preserved_fns;
  32
  33 /* Marker used within call-interactively to refer to point.  */
  34 static Lisp_Object point_marker;
  35
  36 /* String for the prompt text used in Fcall_interactively.  */
  37 static Lisp_Object callint_message;
  38 \f
  39 /* ARGSUSED */
  40 DEFUN ("interactive", Finteractive, Sinteractive, 0, UNEVALLED, 0,
  41        doc: /* Specify a way of parsing arguments for interactive use of a function.
  42 For example, write
  43  (defun foo (arg buf) "Doc string" (interactive "P\\nbbuffer: ") .... )
  44  to make ARG be the raw prefix argument, and set BUF to an existing buffer,
  45  when `foo' is called as a command.
  46 The "call" to `interactive' is actually a declaration rather than a function;
  47  it tells `call-interactively' how to read arguments
  48  to pass to the function.
  49 When actually called, `interactive' just returns nil.
  50
  51 Usually the argument of `interactive' is a string containing a code letter
  52  followed optionally by a prompt.  (Some code letters do not use I/O to get
  53  the argument and do not use prompts.)  To get several arguments, concatenate
  54  the individual strings, separating them by newline characters.
  55 Prompts are passed to format, and may use % escapes to print the
  56  arguments that have already been read.
  57 If the argument is not a string, it is evaluated to get a list of
  58  arguments to pass to the function.
  59 Just `(interactive)' means pass no args when calling interactively.
  60
  61 Code letters available are:
  62 a -- Function name: symbol with a function definition.
  63 b -- Name of existing buffer.
  64 B -- Name of buffer, possibly nonexistent.
  65 c -- Character (no input method is used).
  66 C -- Command name: symbol with interactive function definition.
  67 d -- Value of point as number.  Does not do I/O.
  68 D -- Directory name.
  69 e -- Parameterized event (i.e., one that's a list) that invoked this command.
  70      If used more than once, the Nth `e' returns the Nth parameterized event.
  71      This skips events that are integers or symbols.
  72 f -- Existing file name.
  73 F -- Possibly nonexistent file name.
  74 G -- Possibly nonexistent file name, defaulting to just directory name.
  75 i -- Ignored, i.e. always nil.  Does not do I/O.
  76 k -- Key sequence (downcase the last event if needed to get a definition).
  77 K -- Key sequence to be redefined (do not downcase the last event).
  78 m -- Value of mark as number.  Does not do I/O.
  79 M -- Any string.  Inherits the current input method.
  80 n -- Number read using minibuffer.
  81 N -- Numeric prefix arg, or if none, do like code `n'.
  82 p -- Prefix arg converted to number.  Does not do I/O.
  83 P -- Prefix arg in raw form.  Does not do I/O.
  84 r -- Region: point and mark as 2 numeric args, smallest first.  Does no I/O.
  85 s -- Any string.  Does not inherit the current input method.
  86 S -- Any symbol.
  87 U -- Mouse up event discarded by a previous k or K argument.
  88 v -- Variable name: symbol that is `custom-variable-p'.
  89 x -- Lisp expression read but not evaluated.
  90 X -- Lisp expression read and evaluated.
  91 z -- Coding system.
  92 Z -- Coding system, nil if no prefix arg.
  93
  94 In addition, if the string begins with `*', an error is signaled if
  95   the buffer is read-only.
  96 If `@' appears at the beginning of the string, and if the key sequence
  97  used to invoke the command includes any mouse events, then the window
  98  associated with the first of those events is selected before the
  99  command is run.
 100 If the string begins with `^' and `shift-select-mode' is non-nil,
 101  Emacs first calls the function `handle-shift-selection'.
 102 You may use `@', `*', and `^' together.  They are processed in the
 103  order that they appear, before reading any arguments.
 104 usage: (interactive &optional ARGS)  */
 105        attributes: const)
 106   (Lisp_Object args)
 107 {
 108   return Qnil;
 109 }
 110
 111 /* Quotify EXP: if EXP is constant, return it.
 112    If EXP is not constant, return (quote EXP).  */
 113 static Lisp_Object
 114 quotify_arg (register Lisp_Object exp)
 115 {
 116   if (CONSP (exp)
 117       || (SYMBOLP (exp)
 118           && !NILP (exp) && !EQ (exp, Qt)))
 119     return list2 (Qquote, exp);
 120
 121   return exp;
 122 }
 123
 124 /* Modify EXP by quotifying each element (except the first).  */
 125 static Lisp_Object
 126 quotify_args (Lisp_Object exp)
 127 {
 128   register Lisp_Object tail;
 129   Lisp_Object next;
 130   for (tail = exp; CONSP (tail); tail = next)
 131     {
 132       next = XCDR (tail);
 133       XSETCAR (tail, quotify_arg (XCAR (tail)));
 134     }
 135   return exp;
 136 }
 137
 138 static const char *callint_argfuns[]
 139     = {"", "point", "mark", "region-beginning", "region-end"};
 140
 141 static void
 142 check_mark (bool for_region)
 143 {
 144   Lisp_Object tem;
 145   tem = Fmarker_buffer (BVAR (current_buffer, mark));
 146   if (NILP (tem) || (XBUFFER (tem) != current_buffer))
 147     error (for_region ? "The mark is not set now, so there is no region"
 148            : "The mark is not set now");
 149   if (!NILP (Vtransient_mark_mode) && NILP (Vmark_even_if_inactive)
 150       && NILP (BVAR (current_buffer, mark_active)))
 151     xsignal0 (Qmark_inactive);
 152 }
 153
 154 /* If the list of args INPUT was produced with an explicit call to
 155    `list', look for elements that were computed with
 156    (region-beginning) or (region-end), and put those expressions into
 157    VALUES instead of the present values.
 158
 159    This function doesn't return a value because it modifies elements
 160    of VALUES to do its job.  */
 161
 162 static void
 163 fix_command (Lisp_Object input, Lisp_Object values)
 164 {
 165   /* FIXME: Instead of this ugly hack, we should provide a way for an
 166      interactive spec to return an expression/function that will re-build the
 167      args without user intervention.  */
 168   if (CONSP (input))
 169     {
 170       Lisp_Object car;
 171
 172       car = XCAR (input);
 173       /* Skip through certain special forms.  */
 174       while (EQ (car, Qlet) || EQ (car, Qletx)
 175              || EQ (car, Qsave_excursion)
 176              || EQ (car, Qprogn))
 177         {
 178           while (CONSP (XCDR (input)))
 179             input = XCDR (input);
 180           input = XCAR (input);
 181           if (!CONSP (input))
 182             break;
 183           car = XCAR (input);
 184         }
 185       if (EQ (car, Qlist))
 186         {
 187           Lisp_Object intail, valtail;
 188           for (intail = Fcdr (input), valtail = values;
 189                CONSP (valtail);
 190                intail = Fcdr (intail), valtail = XCDR (valtail))
 191             {
 192               Lisp_Object elt;
 193               elt = Fcar (intail);
 194               if (CONSP (elt))
 195                 {
 196                   Lisp_Object presflag, carelt;
 197                   carelt = XCAR (elt);
 198                   /* If it is (if X Y), look at Y.  */
 199                   if (EQ (carelt, Qif)
 200                       && EQ (Fnthcdr (make_number (3), elt), Qnil))
 201                     elt = Fnth (make_number (2), elt);
 202                   /* If it is (when ... Y), look at Y.  */
 203                   else if (EQ (carelt, Qwhen))
 204                     {
 205                       while (CONSP (XCDR (elt)))
 206                         elt = XCDR (elt);
 207                       elt = Fcar (elt);
 208                     }
 209
 210                   /* If the function call we're looking at
 211                      is a special preserved one, copy the
 212                      whole expression for this argument.  */
 213                   if (CONSP (elt))
 214                     {
 215                       presflag = Fmemq (Fcar (elt), preserved_fns);
 216                       if (!NILP (presflag))
 217                         Fsetcar (valtail, Fcar (intail));
 218                     }
 219                 }
 220             }
 221         }
 222     }
 223 }
 224
 225 /* Helper function to call `read-file-name' from C.  */
 226
 227 static Lisp_Object
 228 read_file_name (Lisp_Object default_filename, Lisp_Object mustmatch,
 229                 Lisp_Object initial, Lisp_Object predicate)
 230 {
 231   struct gcpro gcpro1;
 232   GCPRO1 (default_filename);
 233   RETURN_UNGCPRO (CALLN (Ffuncall, intern ("read-file-name"),
 234                          callint_message, Qnil, default_filename,
 235                          mustmatch, initial, predicate));
 236 }
 237
 238 /* BEWARE: Calling this directly from C would defeat the purpose!  */
 239 DEFUN ("funcall-interactively", Ffuncall_interactively, Sfuncall_interactively,
 240        1, MANY, 0, doc: /* Like `funcall' but marks the call as interactive.
 241 I.e. arrange that within the called function `called-interactively-p' will
 242 return non-nil.
 243 usage: (funcall-interactively FUNCTION &rest ARGUMENTS)  */)
 244      (ptrdiff_t nargs, Lisp_Object *args)
 245 {
 246   ptrdiff_t speccount = SPECPDL_INDEX ();
 247   temporarily_switch_to_single_kboard (NULL);
 248
 249   /* Nothing special to do here, all the work is inside
 250      `called-interactively-p'.  Which will look for us as a marker in the
 251      backtrace.  */
 252   return unbind_to (speccount, Ffuncall (nargs, args));
 253 }
 254
 255 DEFUN ("call-interactively", Fcall_interactively, Scall_interactively, 1, 3, 0,
 256        doc: /* Call FUNCTION, providing args according to its interactive calling specs.
 257 Return the value FUNCTION returns.
 258 The function contains a specification of how to do the argument reading.
 259 In the case of user-defined functions, this is specified by placing a call
 260 to the function `interactive' at the top level of the function body.
 261 See `interactive'.
 262
 263 Optional second arg RECORD-FLAG non-nil
 264 means unconditionally put this command in the command-history.
 265 Otherwise, this is done only if an arg is read using the minibuffer.
 266
 267 Optional third arg KEYS, if given, specifies the sequence of events to
 268 supply, as a vector, if the command inquires which events were used to
 269 invoke it.  If KEYS is omitted or nil, the return value of
 270 `this-command-keys-vector' is used.  */)
 271   (Lisp_Object function, Lisp_Object record_flag, Lisp_Object keys)
 272 {
 273   /* `args' will contain the array of arguments to pass to the function.
 274      `visargs' will contain the same list but in a nicer form, so that if we
 275      pass it to `Fformat' it will be understandable to a human.  */
 276   Lisp_Object *args, *visargs;
 277   Lisp_Object specs;
 278   Lisp_Object filter_specs;
 279   Lisp_Object teml;
 280   Lisp_Object up_event;
 281   Lisp_Object enable;
 282   USE_SAFE_ALLOCA;
 283   ptrdiff_t speccount = SPECPDL_INDEX ();
 284
 285   /* The index of the next element of this_command_keys to examine for
 286      the 'e' interactive code.  */
 287   ptrdiff_t next_event;
 288
 289   Lisp_Object prefix_arg;
 290   char *string;
 291   const char *tem;
 292
 293   /* If varies[i] > 0, the i'th argument shouldn't just have its value
 294      in this call quoted in the command history.  It should be
 295      recorded as a call to the function named callint_argfuns[varies[i]].  */
 296   signed char *varies;
 297
 298   ptrdiff_t i, nargs;
 299   ptrdiff_t mark;
 300   bool arg_from_tty = 0;
 301   struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
 302   ptrdiff_t key_count;
 303   bool record_then_fail = 0;
 304
 305   Lisp_Object save_this_command, save_last_command;
 306   Lisp_Object save_this_original_command, save_real_this_command;
 307
 308   save_this_command = Vthis_command;
 309   save_this_original_command = Vthis_original_command;
 310   save_real_this_command = Vreal_this_command;
 311   save_last_command = KVAR (current_kboard, Vlast_command);
 312
 313   if (NILP (keys))
 314     keys = this_command_keys, key_count = this_command_key_count;
 315   else
 316     {
 317       CHECK_VECTOR (keys);
 318       key_count = ASIZE (keys);
 319     }
 320
 321   /* Save this now, since use of minibuffer will clobber it.  */
 322   prefix_arg = Vcurrent_prefix_arg;
 323
 324   if (SYMBOLP (function))
 325     enable = Fget (function, Qenable_recursive_minibuffers);
 326   else
 327     enable = Qnil;
 328
 329   specs = Qnil;
 330   string = 0;
 331   /* The idea of FILTER_SPECS is to provide a way to
 332      specify how to represent the arguments in command history.
 333      The feature is not fully implemented.  */
 334   filter_specs = Qnil;
 335
 336   /* If k or K discard an up-event, save it here so it can be retrieved with
 337      U.  */
 338   up_event = Qnil;
 339
 340   /* Set SPECS to the interactive form, or barf if not interactive.  */
 341   {
 342     Lisp_Object form;
 343     GCPRO2 (function, prefix_arg);
 344     form = Finteractive_form (function);
 345     UNGCPRO;
 346     if (CONSP (form))
 347       specs = filter_specs = Fcar (XCDR (form));
 348     else
 349       wrong_type_argument (Qcommandp, function);
 350   }
 351
 352   /* If SPECS is not a string, invent one.  */
 353   if (! STRINGP (specs))
 354     {
 355       Lisp_Object input;
 356       Lisp_Object funval = Findirect_function (function, Qt);
 357       uintmax_t events = num_input_events;
 358       input = specs;
 359       /* Compute the arg values using the user's expression.  */
 360       GCPRO2 (input, filter_specs);
 361       specs = Feval (specs,
 362                      CONSP (funval) && EQ (Qclosure, XCAR (funval))
 363                      ? CAR_SAFE (XCDR (funval)) : Qnil);
 364       UNGCPRO;
 365       if (events != num_input_events || !NILP (record_flag))
 366         {
 367           /* We should record this command on the command history.  */
 368           Lisp_Object values;
 369           Lisp_Object this_cmd;
 370           /* Make a copy of the list of values, for the command history,
 371              and turn them into things we can eval.  */
 372           values = quotify_args (Fcopy_sequence (specs));
 373           fix_command (input, values);
 374           this_cmd = Fcons (function, values);
 375           if (history_delete_duplicates)
 376             Vcommand_history = Fdelete (this_cmd, Vcommand_history);
 377           Vcommand_history = Fcons (this_cmd, Vcommand_history);
 378
 379           /* Don't keep command history around forever.  */
 380           if (INTEGERP (Vhistory_length) && XINT (Vhistory_length) > 0)
 381             {
 382               teml = Fnthcdr (Vhistory_length, Vcommand_history);
 383               if (CONSP (teml))
 384                 XSETCDR (teml, Qnil);
 385             }
 386         }
 387
 388       Vthis_command = save_this_command;
 389       Vthis_original_command = save_this_original_command;
 390       Vreal_this_command = save_real_this_command;
 391       kset_last_command (current_kboard, save_last_command);
 392
 393       Lisp_Object result
 394         = unbind_to (speccount, CALLN (Fapply, Qfuncall_interactively,
 395                                        function, specs));
 396       SAFE_FREE ();
 397       return result;
 398     }
 399
 400   /* SPECS is set to a string; use it as an interactive prompt.
 401      Copy it so that STRING will be valid even if a GC relocates SPECS.  */
 402   SAFE_ALLOCA_STRING (string, specs);
 403
 404   /* Here if function specifies a string to control parsing the defaults.  */
 405
 406   /* Set next_event to point to the first event with parameters.  */
 407   for (next_event = 0; next_event < key_count; next_event++)
 408     if (EVENT_HAS_PARAMETERS (AREF (keys, next_event)))
 409       break;
 410
 411   /* Handle special starting chars `*' and `@'.  Also `-'.  */
 412   /* Note that `+' is reserved for user extensions.  */
 413   while (1)
 414     {
 415       if (*string == '+')
 416         error ("`+' is not used in `interactive' for ordinary commands");
 417       else if (*string == '*')
 418         {
 419           string++;
 420           if (!NILP (BVAR (current_buffer, read_only)))
 421             {
 422               if (!NILP (record_flag))
 423                 {
 424                   char *p = string;
 425                   while (*p)
 426                     {
 427                       if (! (*p == 'r' || *p == 'p' || *p == 'P'
 428                              || *p == '\n'))
 429                         Fbarf_if_buffer_read_only (Qnil);
 430                       p++;
 431                     }
 432                   record_then_fail = 1;
 433                 }
 434               else
 435                 Fbarf_if_buffer_read_only (Qnil);
 436             }
 437         }
 438       /* Ignore this for semi-compatibility with Lucid.  */
 439       else if (*string == '-')
 440         string++;
 441       else if (*string == '@')
 442         {
 443           Lisp_Object event, w;
 444
 445           event = (next_event < key_count
 446                    ? AREF (keys, next_event)
 447                    : Qnil);
 448           if (EVENT_HAS_PARAMETERS (event)
 449               && (w = XCDR (event), CONSP (w))
 450               && (w = XCAR (w), CONSP (w))
 451               && (w = XCAR (w), WINDOWP (w)))
 452             {
 453               if (MINI_WINDOW_P (XWINDOW (w))
 454                   && ! (minibuf_level > 0 && EQ (w, minibuf_window)))
 455                 error ("Attempt to select inactive minibuffer window");
 456
 457               /* If the current buffer wants to clean up, let it.  */
 458               run_hook (Qmouse_leave_buffer_hook);
 459
 460               Fselect_window (w, Qnil);
 461             }
 462           string++;
 463         }
 464       else if (*string == '^')
 465         {
 466           call0 (Qhandle_shift_selection);
 467           string++;
 468         }
 469       else break;
 470     }
 471
 472   /* Count the number of arguments, which is two (the function itself and
 473      `funcall-interactively') plus the number of arguments the interactive spec
 474      would have us give to the function.  */
 475   tem = string;
 476   for (nargs = 2; *tem; )
 477     {
 478       /* 'r' specifications ("point and mark as 2 numeric args")
 479          produce *two* arguments.  */
 480       if (*tem == 'r')
 481         nargs += 2;
 482       else
 483         nargs++;
 484       tem = strchr (tem, '\n');
 485       if (tem)
 486         ++tem;
 487       else
 488         break;
 489     }
 490
 491   if (MOST_POSITIVE_FIXNUM < min (PTRDIFF_MAX, SIZE_MAX) / word_size
 492       && MOST_POSITIVE_FIXNUM < nargs)
 493     memory_full (SIZE_MAX);
 494
 495   /* Allocate them all at one go.  This wastes a bit of memory, but
 496      it's OK to trade space for speed.  */
 497   SAFE_NALLOCA (args, 3, nargs);
 498   visargs = args + nargs;
 499   varies = (signed char *) (visargs + nargs);
 500
 501   memclear (args, nargs * (2 * word_size + 1));
 502
 503   GCPRO5 (prefix_arg, function, *args, *visargs, up_event);
 504   gcpro3.nvars = nargs;
 505   gcpro4.nvars = nargs;
 506
 507   if (!NILP (enable))
 508     specbind (Qenable_recursive_minibuffers, Qt);
 509
 510   tem = string;
 511   for (i = 2; *tem; i++)
 512     {
 513       visargs[1] = make_string (tem + 1, strcspn (tem + 1, "\n"));
 514       if (strchr (SSDATA (visargs[1]), '%'))
 515         callint_message = Fformat (i - 1, visargs + 1);
 516       else
 517         callint_message = visargs[1];
 518
 519       switch (*tem)
 520         {
 521         case 'a':               /* Symbol defined as a function.  */
 522           visargs[i] = Fcompleting_read (callint_message,
 523                                          Vobarray, Qfboundp, Qt,
 524                                          Qnil, Qnil, Qnil, Qnil);
 525           /* Passing args[i] directly stimulates compiler bug.  */
 526           teml = visargs[i];
 527           args[i] = Fintern (teml, Qnil);
 528           break;
 529
 530         case 'b':               /* Name of existing buffer.  */
 531           args[i] = Fcurrent_buffer ();
 532           if (EQ (selected_window, minibuf_window))
 533             args[i] = Fother_buffer (args[i], Qnil, Qnil);
 534           args[i] = Fread_buffer (callint_message, args[i], Qt);
 535           break;
 536
 537         case 'B':               /* Name of buffer, possibly nonexistent.  */
 538           args[i] = Fread_buffer (callint_message,
 539                                   Fother_buffer (Fcurrent_buffer (), Qnil, Qnil),
 540                                   Qnil);
 541           break;
 542
 543         case 'c':               /* Character.  */
 544           /* Prompt in `minibuffer-prompt' face.  */
 545           Fput_text_property (make_number (0),
 546                               make_number (SCHARS (callint_message)),
 547                               Qface, Qminibuffer_prompt, callint_message);
 548           args[i] = Fread_char (callint_message, Qnil, Qnil);
 549           message1_nolog (0);
 550           /* Passing args[i] directly stimulates compiler bug.  */
 551           teml = args[i];
 552           /* See bug#8479.  */
 553           if (! CHARACTERP (teml)) error ("Non-character input-event");
 554           visargs[i] = Fchar_to_string (teml);
 555           break;
 556
 557         case 'C':             /* Command: symbol with interactive function.  */
 558           visargs[i] = Fcompleting_read (callint_message,
 559                                          Vobarray, Qcommandp,
 560                                          Qt, Qnil, Qnil, Qnil, Qnil);
 561           /* Passing args[i] directly stimulates compiler bug.  */
 562           teml = visargs[i];
 563           args[i] = Fintern (teml, Qnil);
 564           break;
 565
 566         case 'd':               /* Value of point.  Does not do I/O.  */
 567           set_marker_both (point_marker, Qnil, PT, PT_BYTE);
 568           args[i] = point_marker;
 569           /* visargs[i] = Qnil; */
 570           varies[i] = 1;
 571           break;
 572
 573         case 'D':               /* Directory name.  */
 574           args[i] = read_file_name (BVAR (current_buffer, directory), Qlambda, Qnil,
 575                                     Qfile_directory_p);
 576           break;
 577
 578         case 'f':               /* Existing file name.  */
 579           args[i] = read_file_name (Qnil, Qlambda, Qnil, Qnil);
 580           break;
 581
 582         case 'F':               /* Possibly nonexistent file name.  */
 583           args[i] = read_file_name (Qnil, Qnil, Qnil, Qnil);
 584           break;
 585
 586         case 'G':               /* Possibly nonexistent file name,
 587                                    default to directory alone.  */
 588           args[i] = read_file_name (Qnil, Qnil, empty_unibyte_string, Qnil);
 589           break;
 590
 591         case 'i':               /* Ignore an argument -- Does not do I/O.  */
 592           varies[i] = -1;
 593           break;
 594
 595         case 'k':               /* Key sequence.  */
 596           {
 597             ptrdiff_t speccount1 = SPECPDL_INDEX ();
 598             specbind (Qcursor_in_echo_area, Qt);
 599             /* Prompt in `minibuffer-prompt' face.  */
 600             Fput_text_property (make_number (0),
 601                                 make_number (SCHARS (callint_message)),
 602                                 Qface, Qminibuffer_prompt, callint_message);
 603             args[i] = Fread_key_sequence (callint_message,
 604                                           Qnil, Qnil, Qnil, Qnil);
 605             unbind_to (speccount1, Qnil);
 606             teml = args[i];
 607             visargs[i] = Fkey_description (teml, Qnil);
 608
 609             /* If the key sequence ends with a down-event,
 610                discard the following up-event.  */
 611             teml = Faref (args[i], make_number (XINT (Flength (args[i])) - 1));
 612             if (CONSP (teml))
 613               teml = XCAR (teml);
 614             if (SYMBOLP (teml))
 615               {
 616                 Lisp_Object tem2;
 617
 618                 teml = Fget (teml, Qevent_symbol_elements);
 619                 /* Ignore first element, which is the base key.  */
 620                 tem2 = Fmemq (Qdown, Fcdr (teml));
 621                 if (! NILP (tem2))
 622                   up_event = Fread_event (Qnil, Qnil, Qnil);
 623               }
 624           }
 625           break;
 626
 627         case 'K':               /* Key sequence to be defined.  */
 628           {
 629             ptrdiff_t speccount1 = SPECPDL_INDEX ();
 630             specbind (Qcursor_in_echo_area, Qt);
 631             /* Prompt in `minibuffer-prompt' face.  */
 632             Fput_text_property (make_number (0),
 633                                 make_number (SCHARS (callint_message)),
 634                                 Qface, Qminibuffer_prompt, callint_message);
 635             args[i] = Fread_key_sequence_vector (callint_message,
 636                                                  Qnil, Qt, Qnil, Qnil);
 637             teml = args[i];
 638             visargs[i] = Fkey_description (teml, Qnil);
 639             unbind_to (speccount1, Qnil);
 640
 641             /* If the key sequence ends with a down-event,
 642                discard the following up-event.  */
 643             teml = Faref (args[i], make_number (XINT (Flength (args[i])) - 1));
 644             if (CONSP (teml))
 645               teml = XCAR (teml);
 646             if (SYMBOLP (teml))
 647               {
 648                 Lisp_Object tem2;
 649
 650                 teml = Fget (teml, Qevent_symbol_elements);
 651                 /* Ignore first element, which is the base key.  */
 652                 tem2 = Fmemq (Qdown, Fcdr (teml));
 653                 if (! NILP (tem2))
 654                   up_event = Fread_event (Qnil, Qnil, Qnil);
 655               }
 656           }
 657           break;
 658
 659         case 'U':               /* Up event from last k or K.  */
 660           if (!NILP (up_event))
 661             {
 662               args[i] = Fmake_vector (make_number (1), up_event);
 663               up_event = Qnil;
 664               teml = args[i];
 665               visargs[i] = Fkey_description (teml, Qnil);
 666             }
 667           break;
 668
 669         case 'e':               /* The invoking event.  */
 670           if (next_event >= key_count)
 671             error ("%s must be bound to an event with parameters",
 672                    (SYMBOLP (function)
 673                     ? SSDATA (SYMBOL_NAME (function))
 674                     : "command"));
 675           args[i] = AREF (keys, next_event);
 676           next_event++;
 677           varies[i] = -1;
 678
 679           /* Find the next parameterized event.  */
 680           while (next_event < key_count
 681                  && !(EVENT_HAS_PARAMETERS (AREF (keys, next_event))))
 682             next_event++;
 683
 684           break;
 685
 686         case 'm':               /* Value of mark.  Does not do I/O.  */
 687           check_mark (0);
 688           /* visargs[i] = Qnil; */
 689           args[i] = BVAR (current_buffer, mark);
 690           varies[i] = 2;
 691           break;
 692
 693         case 'M':               /* String read via minibuffer with
 694                                    inheriting the current input method.  */
 695           args[i] = Fread_string (callint_message,
 696                                   Qnil, Qnil, Qnil, Qt);
 697           break;
 698
 699         case 'N':     /* Prefix arg as number, else number from minibuffer.  */
 700           if (!NILP (prefix_arg))
 701             goto have_prefix_arg;
 702         case 'n':               /* Read number from minibuffer.  */
 703           args[i] = call1 (Qread_number, callint_message);
 704           /* Passing args[i] directly stimulates compiler bug.  */
 705           teml = args[i];
 706           visargs[i] = Fnumber_to_string (teml);
 707           break;
 708
 709         case 'P':               /* Prefix arg in raw form.  Does no I/O.  */
 710           args[i] = prefix_arg;
 711           /* visargs[i] = Qnil; */
 712           varies[i] = -1;
 713           break;
 714
 715         case 'p':               /* Prefix arg converted to number.  No I/O.  */
 716         have_prefix_arg:
 717           args[i] = Fprefix_numeric_value (prefix_arg);
 718           /* visargs[i] = Qnil; */
 719           varies[i] = -1;
 720           break;
 721
 722         case 'r':               /* Region, point and mark as 2 args.  */
 723           check_mark (1);
 724           set_marker_both (point_marker, Qnil, PT, PT_BYTE);
 725           /* visargs[i+1] = Qnil; */
 726           mark = marker_position (BVAR (current_buffer, mark));
 727           /* visargs[i] = Qnil; */
 728           args[i] = PT < mark ? point_marker : BVAR (current_buffer, mark);
 729           varies[i] = 3;
 730           args[++i] = PT > mark ? point_marker : BVAR (current_buffer, mark);
 731           varies[i] = 4;
 732           break;
 733
 734         case 's':               /* String read via minibuffer without
 735                                    inheriting the current input method.  */
 736           args[i] = Fread_string (callint_message,
 737                                   Qnil, Qnil, Qnil, Qnil);
 738           break;
 739
 740         case 'S':               /* Any symbol.  */
 741           visargs[i] = Fread_string (callint_message,
 742                                      Qnil, Qnil, Qnil, Qnil);
 743           /* Passing args[i] directly stimulates compiler bug.  */
 744           teml = visargs[i];
 745           args[i] = Fintern (teml, Qnil);
 746           break;
 747
 748         case 'v':               /* Variable name: symbol that is
 749                                    custom-variable-p.  */
 750           args[i] = Fread_variable (callint_message, Qnil);
 751           visargs[i] = last_minibuf_string;
 752           break;
 753
 754         case 'x':               /* Lisp expression read but not evaluated.  */
 755           args[i] = call1 (intern ("read-minibuffer"), callint_message);
 756           visargs[i] = last_minibuf_string;
 757           break;
 758
 759         case 'X':               /* Lisp expression read and evaluated.  */
 760           args[i] = call1 (intern ("eval-minibuffer"), callint_message);
 761           visargs[i] = last_minibuf_string;
 762           break;
 763
 764         case 'Z':               /* Coding-system symbol, or ignore the
 765                                    argument if no prefix.  */
 766           if (NILP (prefix_arg))
 767             {
 768               /* args[i] = Qnil; */
 769               varies[i] = -1;
 770             }
 771           else
 772             {
 773               args[i]
 774                 = Fread_non_nil_coding_system (callint_message);
 775               visargs[i] = last_minibuf_string;
 776             }
 777           break;
 778
 779         case 'z':               /* Coding-system symbol or nil.  */
 780           args[i] = Fread_coding_system (callint_message, Qnil);
 781           visargs[i] = last_minibuf_string;
 782           break;
 783
 784           /* We have a case for `+' so we get an error
 785              if anyone tries to define one here.  */
 786         case '+':
 787         default:
 788           error ("Invalid control letter `%c' (#o%03o, #x%04x) in interactive calling string",
 789                  STRING_CHAR ((unsigned char *) tem),
 790                  (unsigned) STRING_CHAR ((unsigned char *) tem),
 791                  (unsigned) STRING_CHAR ((unsigned char *) tem));
 792         }
 793
 794       if (varies[i] == 0)
 795         arg_from_tty = 1;
 796
 797       if (NILP (visargs[i]) && STRINGP (args[i]))
 798         visargs[i] = args[i];
 799
 800       tem = strchr (tem, '\n');
 801       if (tem) tem++;
 802       else tem = "";
 803     }
 804   unbind_to (speccount, Qnil);
 805
 806   QUIT;
 807
 808   args[0] = Qfuncall_interactively;
 809   args[1] = function;
 810
 811   if (arg_from_tty || !NILP (record_flag))
 812     {
 813       /* We don't need `visargs' any more, so let's recycle it since we need
 814          an array of just the same size.  */
 815       visargs[1] = function;
 816       for (i = 2; i < nargs; i++)
 817         {
 818           if (varies[i] > 0)
 819             visargs[i] = list1 (intern (callint_argfuns[varies[i]]));
 820           else
 821             visargs[i] = quotify_arg (args[i]);
 822         }
 823       Vcommand_history = Fcons (Flist (nargs - 1, visargs + 1),
 824                                 Vcommand_history);
 825       /* Don't keep command history around forever.  */
 826       if (INTEGERP (Vhistory_length) && XINT (Vhistory_length) > 0)
 827         {
 828           teml = Fnthcdr (Vhistory_length, Vcommand_history);
 829           if (CONSP (teml))
 830             XSETCDR (teml, Qnil);
 831         }
 832     }
 833
 834   /* If we used a marker to hold point, mark, or an end of the region,
 835      temporarily, convert it to an integer now.  */
 836   for (i = 2; i < nargs; i++)
 837     if (varies[i] >= 1 && varies[i] <= 4)
 838       XSETINT (args[i], marker_position (args[i]));
 839
 840   if (record_then_fail)
 841     Fbarf_if_buffer_read_only (Qnil);
 842
 843   Vthis_command = save_this_command;
 844   Vthis_original_command = save_this_original_command;
 845   Vreal_this_command = save_real_this_command;
 846   kset_last_command (current_kboard, save_last_command);
 847
 848   {
 849     Lisp_Object val = Ffuncall (nargs, args);
 850     UNGCPRO;
 851     val = unbind_to (speccount, val);
 852     SAFE_FREE ();
 853     return val;
 854   }
 855 }
 856
 857 DEFUN ("prefix-numeric-value", Fprefix_numeric_value, Sprefix_numeric_value,
 858        1, 1, 0,
 859        doc: /* Return numeric meaning of raw prefix argument RAW.
 860 A raw prefix argument is what you get from `(interactive "P")'.
 861 Its numeric meaning is what you would get from `(interactive "p")'.  */)
 862   (Lisp_Object raw)
 863 {
 864   Lisp_Object val;
 865
 866   if (NILP (raw))
 867     XSETFASTINT (val, 1);
 868   else if (EQ (raw, Qminus))
 869     XSETINT (val, -1);
 870   else if (CONSP (raw) && INTEGERP (XCAR (raw)))
 871     XSETINT (val, XINT (XCAR (raw)));
 872   else if (INTEGERP (raw))
 873     val = raw;
 874   else
 875     XSETFASTINT (val, 1);
 876
 877   return val;
 878 }
 879
 880 void
 881 syms_of_callint (void)
 882 {
 883   point_marker = Fmake_marker ();
 884   staticpro (&point_marker);
 885
 886   callint_message = Qnil;
 887   staticpro (&callint_message);
 888
 889   preserved_fns = listn (CONSTYPE_PURE, 4,
 890                          intern_c_string ("region-beginning"),
 891                          intern_c_string ("region-end"),
 892                          intern_c_string ("point"),
 893                          intern_c_string ("mark"));
 894
 895   DEFSYM (Qlist, "list");
 896   DEFSYM (Qlet, "let");
 897   DEFSYM (Qif, "if");
 898   DEFSYM (Qwhen, "when");
 899   DEFSYM (Qletx, "let*");
 900   DEFSYM (Qsave_excursion, "save-excursion");
 901   DEFSYM (Qprogn, "progn");
 902   DEFSYM (Qminus, "-");
 903   DEFSYM (Qplus, "+");
 904   DEFSYM (Qhandle_shift_selection, "handle-shift-selection");
 905   DEFSYM (Qread_number, "read-number");
 906   DEFSYM (Qfuncall_interactively, "funcall-interactively");
 907   DEFSYM (Qcommand_debug_status, "command-debug-status");
 908   DEFSYM (Qenable_recursive_minibuffers, "enable-recursive-minibuffers");
 909   DEFSYM (Qmouse_leave_buffer_hook, "mouse-leave-buffer-hook");
 910
 911   DEFVAR_KBOARD ("prefix-arg", Vprefix_arg,
 912                  doc: /* The value of the prefix argument for the next editing command.
 913 It may be a number, or the symbol `-' for just a minus sign as arg,
 914 or a list whose car is a number for just one or more C-u's
 915 or nil if no argument has been specified.
 916
 917 You cannot examine this variable to find the argument for this command
 918 since it has been set to nil by the time you can look.
 919 Instead, you should use the variable `current-prefix-arg', although
 920 normally commands can get this prefix argument with (interactive "P").  */);
 921
 922   DEFVAR_KBOARD ("last-prefix-arg", Vlast_prefix_arg,
 923                  doc: /* The value of the prefix argument for the previous editing command.
 924 See `prefix-arg' for the meaning of the value.  */);
 925
 926   DEFVAR_LISP ("current-prefix-arg", Vcurrent_prefix_arg,
 927                doc: /* The value of the prefix argument for this editing command.
 928 It may be a number, or the symbol `-' for just a minus sign as arg,
 929 or a list whose car is a number for just one or more C-u's
 930 or nil if no argument has been specified.
 931 This is what `(interactive \"P\")' returns.  */);
 932   Vcurrent_prefix_arg = Qnil;
 933
 934   DEFVAR_LISP ("command-history", Vcommand_history,
 935                doc: /* List of recent commands that read arguments from terminal.
 936 Each command is represented as a form to evaluate.
 937
 938 Maximum length of the history list is determined by the value
 939 of `history-length', which see.  */);
 940   Vcommand_history = Qnil;
 941
 942   DEFVAR_LISP ("command-debug-status", Vcommand_debug_status,
 943                doc: /* Debugging status of current interactive command.
 944 Bound each time `call-interactively' is called;
 945 may be set by the debugger as a reminder for itself.  */);
 946   Vcommand_debug_status = Qnil;
 947
 948   DEFVAR_LISP ("mark-even-if-inactive", Vmark_even_if_inactive,
 949                doc: /* Non-nil means you can use the mark even when inactive.
 950 This option makes a difference in Transient Mark mode.
 951 When the option is non-nil, deactivation of the mark
 952 turns off region highlighting, but commands that use the mark
 953 behave as if the mark were still active.  */);
 954   Vmark_even_if_inactive = Qt;
 955
 956   DEFVAR_LISP ("mouse-leave-buffer-hook", Vmouse_leave_buffer_hook,
 957                doc: /* Hook to run when about to switch windows with a mouse command.
 958 Its purpose is to give temporary modes such as Isearch mode
 959 a way to turn themselves off when a mouse command switches windows.  */);
 960   Vmouse_leave_buffer_hook = Qnil;
 961
 962   defsubr (&Sinteractive);
 963   defsubr (&Scall_interactively);
 964   defsubr (&Sfuncall_interactively);
 965   defsubr (&Sprefix_numeric_value);
 966 }