keyboard.c 208 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Keyboard and mouse input; editor command loop.
2
   Copyright (C) 1985,86,87,88,89,93,94,95 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

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
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22
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.  */

/* Allow config.h to undefine symbols found here.  */
#include <signal.h>

23
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
24 25 26 27 28 29
#include <stdio.h>
#include "termchar.h"
#include "termopts.h"
#include "lisp.h"
#include "termhooks.h"
#include "macros.h"
Jim Blandy's avatar
Jim Blandy committed
30
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
31 32 33 34
#include "window.h"
#include "commands.h"
#include "buffer.h"
#include "disptab.h"
35
#include "dispextern.h"
Jim Blandy's avatar
Jim Blandy committed
36
#include "keyboard.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
37
#include "intervals.h"
38
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
39 40 41
#include <setjmp.h>
#include <errno.h>

42 43 44 45
#ifdef MSDOS
#include "msdos.h"
#include <time.h>
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
46 47 48
#ifndef VMS
#include <sys/ioctl.h>
#endif
49
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
50

Jim Blandy's avatar
Jim Blandy committed
51
#include "syssignal.h"
52
#include "systty.h"
Jim Blandy's avatar
Jim Blandy committed
53

54 55 56 57 58
/* This is to get the definitions of the XK_ symbols.  */
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif

59 60 61
/* Include systime.h after xterm.h to avoid double inclusion of time.h. */
#include "systime.h"

Jim Blandy's avatar
Jim Blandy committed
62 63
extern int errno;

64 65 66
/* Variables for blockinput.h: */

/* Non-zero if interrupt input is blocked right now.  */
67
int interrupt_input_blocked;
68 69 70

/* Nonzero means an input interrupt has arrived
   during the current critical section.  */
71
int interrupt_input_pending;
72 73


74 75
/* File descriptor to use for input.  */
extern int input_fd;
Jim Blandy's avatar
Jim Blandy committed
76

77
#ifdef HAVE_X_WINDOWS
Jim Blandy's avatar
Jim Blandy committed
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
/* Make all keyboard buffers much bigger when using X windows.  */
#define KBD_BUFFER_SIZE 4096
#else	/* No X-windows, character input */
#define KBD_BUFFER_SIZE 256
#endif	/* No X-windows */

/* Following definition copied from eval.c */

struct backtrace
  {
    struct backtrace *next;
    Lisp_Object *function;
    Lisp_Object *args;	/* Points to vector of args. */
    int nargs;		/* length of vector.  If nargs is UNEVALLED,
			   args points to slot holding list of
			   unevalled args */
    char evalargs;
  };

97 98 99 100
#ifdef MULTI_KBOARD
KBOARD *initial_kboard;
KBOARD *current_kboard;
KBOARD *all_kboards;
101
int single_kboard;
102
#else
103
KBOARD the_only_kboard;
104
#endif
105

Jim Blandy's avatar
Jim Blandy committed
106 107
/* Non-nil disable property on a command means
   do not execute it; call disabled-command-hook's value instead.  */
108
Lisp_Object Qdisabled, Qdisabled_command_hook;
Jim Blandy's avatar
Jim Blandy committed
109 110 111 112

#define NUM_RECENT_KEYS (100)
int recent_keys_index;	/* Index for storing next element into recent_keys */
int total_keys;		/* Total number of elements stored into recent_keys */
113
Lisp_Object recent_keys; /* A vector, holding the last 100 keystrokes */
Jim Blandy's avatar
Jim Blandy committed
114

115 116 117 118 119 120 121
/* Vector holding the key sequence that invoked the current command.
   It is reused for each command, and it may be longer than the current
   sequence; this_command_key_count indicates how many elements
   actually mean something.
   It's easier to staticpro a single Lisp_Object than an array.  */
Lisp_Object this_command_keys;
int this_command_key_count;
Jim Blandy's avatar
Jim Blandy committed
122

123 124 125 126 127 128 129 130 131 132 133 134
/* Record values of this_command_key_count and echo_length ()
   before this command was read.  */
static int before_command_key_count;
static int before_command_echo_length;
/* Values of before_command_key_count and before_command_echo_length
   saved by reset-this-command-lengths.  */
static int before_command_key_count_1;
static int before_command_echo_length_1;
/* Flag set by reset-this-command-lengths,
   saying to reset the lengths when add_command_key is called.  */
static int before_command_restore_flag;

Jim Blandy's avatar
Jim Blandy committed
135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
extern int minbuf_level;

extern struct backtrace *backtrace_list;

/* Nonzero means do menu prompting.  */
static int menu_prompting;

/* Character to see next line of menu prompt.  */
static Lisp_Object menu_prompt_more_char;

/* For longjmp to where kbd input is being done.  */
static jmp_buf getcjmp;

/* True while doing kbd input.  */
int waiting_for_input;

/* True while displaying for echoing.   Delays C-g throwing.  */
static int echoing;

154 155 156
/* Nonzero means disregard local maps for the menu bar.  */
static int inhibit_local_menu_bar_menus;

157
/* Nonzero means C-g should cause immediate error-signal.  */
Jim Blandy's avatar
Jim Blandy committed
158 159 160
int immediate_quit;

/* Character to recognize as the help char.  */
161
Lisp_Object Vhelp_char;
Jim Blandy's avatar
Jim Blandy committed
162

Karl Heuer's avatar
Karl Heuer committed
163 164 165
/* List of other event types to recognize as meaning "help".  */
Lisp_Object Vhelp_event_list;

Jim Blandy's avatar
Jim Blandy committed
166 167 168
/* Form to execute when help char is typed.  */
Lisp_Object Vhelp_form;

169 170 171
/* Command to run when the help character follows a prefix key.  */
Lisp_Object Vprefix_help_command;

172 173
/* List of items that should move to the end of the menu bar.  */
Lisp_Object Vmenu_bar_final_items;
174

Jim Blandy's avatar
Jim Blandy committed
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
/* Character that causes a quit.  Normally C-g.

   If we are running on an ordinary terminal, this must be an ordinary
   ASCII char, since we want to make it our interrupt character.

   If we are not running on an ordinary terminal, it still needs to be
   an ordinary ASCII char.  This character needs to be recognized in
   the input interrupt handler.  At this point, the keystroke is
   represented as a struct input_event, while the desired quit
   character is specified as a lispy event.  The mapping from struct
   input_events to lispy events cannot run in an interrupt handler,
   and the reverse mapping is difficult for anything but ASCII
   keystrokes.

   FOR THESE ELABORATE AND UNSATISFYING REASONS, quit_char must be an
   ASCII character.  */
int quit_char;

extern Lisp_Object current_global_map;
extern int minibuf_level;

196 197 198
/* If non-nil, this is a map that overrides all other local maps.  */
Lisp_Object Voverriding_local_map;

199 200 201
/* If non-nil, Voverriding_local_map applies to the menu bar.  */
Lisp_Object Voverriding_local_map_menu_flag;

202 203 204 205
/* Keymap that defines special misc events that should
   be processed immediately at a low level.  */
Lisp_Object Vspecial_event_map;

Jim Blandy's avatar
Jim Blandy committed
206 207 208 209 210 211 212 213 214
/* Current depth in recursive edits.  */
int command_loop_level;

/* Total number of times command_loop has read a key sequence.  */
int num_input_keys;

/* Last input character read as a command.  */
Lisp_Object last_command_char;

215 216 217 218
/* Last input character read as a command, not counting menus
   reached by the mouse.  */
Lisp_Object last_nonmenu_event;

Jim Blandy's avatar
Jim Blandy committed
219 220 221
/* Last input character read for any purpose.  */
Lisp_Object last_input_char;

Jim Blandy's avatar
Jim Blandy committed
222
/* If not Qnil, a list of objects to be read as subsequent command input.  */
223
Lisp_Object Vunread_command_events;
Jim Blandy's avatar
Jim Blandy committed
224

225 226 227
/* If not -1, an event to be read as subsequent command input.  */
int unread_command_char;

228 229
/* If not Qnil, this is a switch-frame event which we decided to put
   off until the end of a key sequence.  This should be read as the
Jim Blandy's avatar
Jim Blandy committed
230
   next command input, after any unread_command_events.
231 232 233 234 235

   read_key_sequence uses this to delay switch-frame events until the
   end of the key sequence; Fread_char uses it to put off switch-frame
   events until a non-ASCII event is acceptable as input.  */
Lisp_Object unread_switch_frame;
236

237 238 239
/* A mask of extra modifier bits to put into every keyboard char.  */
int extra_keyboard_modifiers;

Jim Blandy's avatar
Jim Blandy committed
240 241 242 243 244 245 246 247
/* Char to use as prefix when a meta character is typed in.
   This is bound on entry to minibuffer in case ESC is changed there.  */

Lisp_Object meta_prefix_char;

/* Last size recorded for a current buffer which is not a minibuffer.  */
static int last_non_minibuf_size;

248
/* Number of idle seconds before an auto-save and garbage collection.  */
Jim Blandy's avatar
Jim Blandy committed
249 250 251 252 253
static Lisp_Object Vauto_save_timeout;

/* Total number of times read_char has returned.  */
int num_input_chars;

254 255 256
/* Total number of times read_char has returned, outside of macros.  */
int num_nonmacro_input_chars;

Jim Blandy's avatar
Jim Blandy committed
257 258 259 260 261
/* Auto-save automatically when this many characters have been typed
   since the last time.  */

static int auto_save_interval;

262
/* Value of num_nonmacro_input_chars as of last auto save.  */
Jim Blandy's avatar
Jim Blandy committed
263 264 265 266

int last_auto_save;

/* The command being executed by the command loop.
267 268
   Commands may set this, and the value set will be copied into
   current_kboard->Vlast_command instead of the actual command.  */
Jim Blandy's avatar
Jim Blandy committed
269 270
Lisp_Object this_command;

271 272 273
/* The value of point when the last command was executed.  */
int last_point_position;

274 275 276
/* The buffer that was current when the last command was started.  */
Lisp_Object last_point_position_buffer;

277 278 279 280 281 282 283 284 285 286 287 288 289 290
#ifdef MULTI_FRAME
/* The frame in which the last input event occurred, or Qmacro if the
   last event came from a macro.  We use this to determine when to
   generate switch-frame events.  This may be cleared by functions
   like Fselect_frame, to make sure that a switch-frame event is
   generated by the next character.  */
Lisp_Object internal_last_event_frame;
#endif

/* A user-visible version of the above, intended to allow users to
   figure out where the last event came from, if the event doesn't
   carry that information itself (i.e. if it was a character).  */
Lisp_Object Vlast_event_frame;

Jim Blandy's avatar
Jim Blandy committed
291 292
/* The timestamp of the last input event we received from the X server.
   X Windows wants this for selection ownership.  */
Jim Blandy's avatar
Jim Blandy committed
293 294 295 296 297
unsigned long last_event_timestamp;

Lisp_Object Qself_insert_command;
Lisp_Object Qforward_char;
Lisp_Object Qbackward_char;
298
Lisp_Object Qundefined;
Jim Blandy's avatar
Jim Blandy committed
299 300 301 302 303 304 305 306 307 308 309 310 311 312

/* read_key_sequence stores here the command definition of the
   key sequence that it reads.  */
Lisp_Object read_key_sequence_cmd;

/* Form to evaluate (if non-nil) when Emacs is started.  */
Lisp_Object Vtop_level;

/* User-supplied string to translate input characters through.  */
Lisp_Object Vkeyboard_translate_table;

/* Keymap mapping ASCII function key sequences onto their preferred forms.  */
extern Lisp_Object Vfunction_key_map;

313 314 315
/* Another keymap that maps key sequences into key sequences.
   This one takes precedence over ordinary definitions.  */
extern Lisp_Object Vkey_translation_map;
316

317 318 319
/* Non-nil means deactivate the mark at end of this command.  */
Lisp_Object Vdeactivate_mark;

320 321 322 323 324
/* Menu bar specified in Lucid Emacs fashion.  */

Lisp_Object Vlucid_menu_bar_dirty_flag;
Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook;

325 326 327
/* Hooks to run before and after each command.  */
Lisp_Object Qpre_command_hook, Qpost_command_hook;
Lisp_Object Vpre_command_hook, Vpost_command_hook;
328
Lisp_Object Qcommand_hook_internal, Vcommand_hook_internal;
329

330 331 332 333 334 335
/* List of deferred actions to be performed at a later time.
   The precise format isn't relevant here; we just check whether it is nil.  */
Lisp_Object Vdeferred_action_list;

/* Function to call to handle deferred actions, when there are any.  */
Lisp_Object Vdeferred_action_function;
336
Lisp_Object Qdeferred_action_function;
337

Jim Blandy's avatar
Jim Blandy committed
338 339 340 341 342 343
/* File in which we write all commands we read.  */
FILE *dribble;

/* Nonzero if input is available.  */
int input_pending;

344 345 346
/* 1 if should obey 0200 bit in input chars as "Meta", 2 if should
   keep 0200 bit in input chars.  0 to ignore the 0200 bit.  */

Jim Blandy's avatar
Jim Blandy committed
347 348 349 350
int meta_key;

extern char *pending_malloc_warning;

351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401
/* Circular buffer for pre-read keyboard input.  */
static struct input_event kbd_buffer[KBD_BUFFER_SIZE];

/* Vector to GCPRO the frames and windows mentioned in kbd_buffer.

   The interrupt-level event handlers will never enqueue an event on a
   frame which is not in Vframe_list, and once an event is dequeued,
   internal_last_event_frame or the event itself points to the frame.
   So that's all fine.

   But while the event is sitting in the queue, it's completely
   unprotected.  Suppose the user types one command which will run for
   a while and then delete a frame, and then types another event at
   the frame that will be deleted, before the command gets around to
   it.  Suppose there are no references to this frame elsewhere in
   Emacs, and a GC occurs before the second event is dequeued.  Now we
   have an event referring to a freed frame, which will crash Emacs
   when it is dequeued.

   Similar things happen when an event on a scroll bar is enqueued; the
   window may be deleted while the event is in the queue.

   So, we use this vector to protect the frame_or_window field in the
   event queue.  That way, they'll be dequeued as dead frames or
   windows, but still valid lisp objects.

   If kbd_buffer[i].kind != no_event, then
     (XVECTOR (kbd_buffer_frame_or_window)->contents[i]
      == kbd_buffer[i].frame_or_window.  */
static Lisp_Object kbd_buffer_frame_or_window;

/* Pointer to next available character in kbd_buffer.
   If kbd_fetch_ptr == kbd_store_ptr, the buffer is empty.
   This may be kbd_buffer + KBD_BUFFER_SIZE, meaning that the the
   next available char is in kbd_buffer[0].  */
static struct input_event *kbd_fetch_ptr;

/* Pointer to next place to store character in kbd_buffer.  This
   may be kbd_buffer + KBD_BUFFER_SIZE, meaning that the next
   character should go in kbd_buffer[0].  */
static volatile struct input_event *kbd_store_ptr;

/* The above pair of variables forms a "queue empty" flag.  When we
   enqueue a non-hook event, we increment kbd_store_ptr.  When we
   dequeue a non-hook event, we increment kbd_fetch_ptr.  We say that
   there is input available iff the two pointers are not equal.

   Why not just have a flag set and cleared by the enqueuing and
   dequeuing functions?  Such a flag could be screwed up by interrupts
   at inopportune times.  */

Karl Heuer's avatar
Karl Heuer committed
402
/* If this flag is non-nil, we check mouse_moved to see when the
403 404 405
   mouse moves, and motion events will appear in the input stream.
   Otherwise, mouse motion is ignored.  */
static Lisp_Object do_mouse_tracking;
Jim Blandy's avatar
Jim Blandy committed
406 407 408

/* Symbols to head events.  */
Lisp_Object Qmouse_movement;
409
Lisp_Object Qscroll_bar_movement;
410
Lisp_Object Qswitch_frame;
411
Lisp_Object Qdelete_frame;
412 413
Lisp_Object Qiconify_frame;
Lisp_Object Qmake_frame_visible;
414

Jim Blandy's avatar
Jim Blandy committed
415 416 417 418 419 420 421
/* Symbols to denote kinds of events.  */
Lisp_Object Qfunction_key;
Lisp_Object Qmouse_click;
/* Lisp_Object Qmouse_movement; - also an event header */

/* Properties of event headers.  */
Lisp_Object Qevent_kind;
422
Lisp_Object Qevent_symbol_elements;
Jim Blandy's avatar
Jim Blandy committed
423

424 425
Lisp_Object Qmenu_enable;

426 427 428 429 430 431 432 433 434 435 436 437 438
/* An event header symbol HEAD may have a property named
   Qevent_symbol_element_mask, which is of the form (BASE MODIFIERS);
   BASE is the base, unmodified version of HEAD, and MODIFIERS is the
   mask of modifiers applied to it.  If present, this is used to help
   speed up parse_modifiers.  */
Lisp_Object Qevent_symbol_element_mask;

/* An unmodified event header BASE may have a property named
   Qmodifier_cache, which is an alist mapping modifier masks onto
   modified versions of BASE.  If present, this helps speed up
   apply_modifiers.  */
Lisp_Object Qmodifier_cache;

439
/* Symbols to use for parts of windows.  */
Jim Blandy's avatar
Jim Blandy committed
440
Lisp_Object Qmode_line;
Jim Blandy's avatar
Jim Blandy committed
441
Lisp_Object Qvertical_line;
442
Lisp_Object Qvertical_scroll_bar;
443 444 445
Lisp_Object Qmenu_bar;

extern Lisp_Object Qmenu_enable;
Jim Blandy's avatar
Jim Blandy committed
446

447 448
Lisp_Object recursive_edit_unwind (), command_loop ();
Lisp_Object Fthis_command_keys ();
449
Lisp_Object Qextended_command_history;
Jim Blandy's avatar
Jim Blandy committed
450

451 452
extern char *x_get_keysym_name ();

453 454
Lisp_Object Qpolling_period;

455 456
extern Lisp_Object Vprint_level, Vprint_length;

Jim Blandy's avatar
Jim Blandy committed
457 458 459
/* Address (if not 0) of EMACS_TIME to zero out if a SIGIO interrupt
   happens.  */
EMACS_TIME *input_available_clear_time;
Jim Blandy's avatar
Jim Blandy committed
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483

/* Nonzero means use SIGIO interrupts; zero means use CBREAK mode.
   Default is 1 if INTERRUPT_INPUT is defined.  */
int interrupt_input;

/* Nonzero while interrupts are temporarily deferred during redisplay.  */
int interrupts_deferred;

/* nonzero means use ^S/^Q for flow control.  */
int flow_control;

/* Allow m- file to inhibit use of FIONREAD.  */
#ifdef BROKEN_FIONREAD
#undef FIONREAD
#endif

/* We are unable to use interrupts if FIONREAD is not available,
   so flush SIGIO so we won't try.  */
#ifndef FIONREAD
#ifdef SIGIO
#undef SIGIO
#endif
#endif

484 485
/* If we support X Windows, turn on the code to poll periodically
   to detect C-g.  It isn't actually used when doing interrupt input.  */
Jim Blandy's avatar
Jim Blandy committed
486 487 488 489 490 491 492 493 494 495 496
#ifdef HAVE_X_WINDOWS
#define POLL_FOR_INPUT
#endif

/* Global variable declarations.  */

/* Function for init_keyboard to call with no args (if nonzero).  */
void (*keyboard_init_hook) ();

static int read_avail_input ();
static void get_input_pending ();
497
static int readable_events ();
498 499
static Lisp_Object read_char_x_menu_prompt ();
static Lisp_Object read_char_minibuf_menu_prompt ();
500
static Lisp_Object make_lispy_event ();
501
#ifdef HAVE_MOUSE
502
static Lisp_Object make_lispy_movement ();
503
#endif
504 505
static Lisp_Object modify_event_symbol ();
static Lisp_Object make_lispy_switch_frame ();
506
static int parse_solitary_modifier ();
Jim Blandy's avatar
Jim Blandy committed
507 508 509 510

/* > 0 if we are to echo keystrokes.  */
static int echo_keystrokes;

511 512 513 514
/* Nonzero means don't try to suspend even if the operating system seems
   to support it.  */
static int cannot_suspend;

Jim Blandy's avatar
Jim Blandy committed
515 516 517 518 519 520 521 522 523 524 525
#define	min(a,b)	((a)<(b)?(a):(b))
#define	max(a,b)	((a)>(b)?(a):(b))

/* Install the string STR as the beginning of the string of echoing,
   so that it serves as a prompt for the next character.
   Also start echoing.  */

echo_prompt (str)
     char *str;
{
  int len = strlen (str);
526

527 528
  if (len > ECHOBUFSIZE - 4)
    len = ECHOBUFSIZE - 4;
529 530 531
  bcopy (str, current_kboard->echobuf, len);
  current_kboard->echoptr = current_kboard->echobuf + len;
  *current_kboard->echoptr = '\0';
Jim Blandy's avatar
Jim Blandy committed
532

533
  current_kboard->echo_after_prompt = len;
534

Jim Blandy's avatar
Jim Blandy committed
535 536 537
  echo ();
}

538
/* Add C to the echo string, if echoing is going on.
Jim Blandy's avatar
Jim Blandy committed
539 540 541 542 543 544 545 546
   C can be a character, which is printed prettily ("M-C-x" and all that
   jazz), or a symbol, whose name is printed.  */

echo_char (c)
     Lisp_Object c;
{
  extern char *push_key_description ();

547
  if (current_kboard->immediate_echo)
Jim Blandy's avatar
Jim Blandy committed
548
    {
549
      char *ptr = current_kboard->echoptr;
550

551
      if (ptr != current_kboard->echobuf)
Jim Blandy's avatar
Jim Blandy committed
552 553 554
	*ptr++ = ' ';

      /* If someone has passed us a composite event, use its head symbol.  */
555
      c = EVENT_HEAD (c);
Jim Blandy's avatar
Jim Blandy committed
556

557
      if (INTEGERP (c))
Jim Blandy's avatar
Jim Blandy committed
558
	{
559
	  if (ptr - current_kboard->echobuf > ECHOBUFSIZE - 6)
Jim Blandy's avatar
Jim Blandy committed
560 561
	    return;

562
	  ptr = push_key_description (XINT (c), ptr);
Jim Blandy's avatar
Jim Blandy committed
563
	}
564
      else if (SYMBOLP (c))
Jim Blandy's avatar
Jim Blandy committed
565 566
	{
	  struct Lisp_String *name = XSYMBOL (c)->name;
567
	  if ((ptr - current_kboard->echobuf) + name->size + 4 > ECHOBUFSIZE)
Jim Blandy's avatar
Jim Blandy committed
568 569 570 571 572
	    return;
	  bcopy (name->data, ptr, name->size);
	  ptr += name->size;
	}

573
      if (current_kboard->echoptr == current_kboard->echobuf
Karl Heuer's avatar
Karl Heuer committed
574
	  && help_char_p (c))
Jim Blandy's avatar
Jim Blandy committed
575 576 577 578 579 580
	{
	  strcpy (ptr, " (Type ? for further options)");
	  ptr += strlen (ptr);
	}

      *ptr = 0;
581
      current_kboard->echoptr = ptr;
Jim Blandy's avatar
Jim Blandy committed
582 583 584 585 586 587 588 589 590 591

      echo ();
    }
}

/* Temporarily add a dash to the end of the echo string if it's not
   empty, so that it serves as a mini-prompt for the very next character.  */

echo_dash ()
{
592 593
  if (!current_kboard->immediate_echo
      && current_kboard->echoptr == current_kboard->echobuf)
Jim Blandy's avatar
Jim Blandy committed
594
    return;
595
  /* Do nothing if we just printed a prompt.  */
596 597
  if (current_kboard->echo_after_prompt
      == current_kboard->echoptr - current_kboard->echobuf)
598
    return;
599
  /* Do nothing if not echoing at all.  */
600
  if (current_kboard->echoptr == 0)
601
    return;
Jim Blandy's avatar
Jim Blandy committed
602 603 604

  /* Put a dash at the end of the buffer temporarily,
     but make it go away when the next character is added.  */
605 606
  current_kboard->echoptr[0] = '-';
  current_kboard->echoptr[1] = 0;
Jim Blandy's avatar
Jim Blandy committed
607 608 609 610 611 612 613 614 615

  echo ();
}

/* Display the current echo string, and begin echoing if not already
   doing so.  */

echo ()
{
616
  if (!current_kboard->immediate_echo)
Jim Blandy's avatar
Jim Blandy committed
617 618
    {
      int i;
619
      current_kboard->immediate_echo = 1;
Jim Blandy's avatar
Jim Blandy committed
620 621

      for (i = 0; i < this_command_key_count; i++)
622 623 624 625 626 627 628
	{
	  Lisp_Object c;
	  c = XVECTOR (this_command_keys)->contents[i];
	  if (! (EVENT_HAS_PARAMETERS (c)
		 && EQ (EVENT_HEAD_KIND (EVENT_HEAD (c)), Qmouse_movement)))
	    echo_char (c);
	}
Jim Blandy's avatar
Jim Blandy committed
629 630 631 632
      echo_dash ();
    }

  echoing = 1;
633
  message1_nolog (current_kboard->echobuf);
Jim Blandy's avatar
Jim Blandy committed
634 635 636 637 638 639 640 641 642 643
  echoing = 0;

  if (waiting_for_input && !NILP (Vquit_flag))
    quit_throw_to_read_char ();
}

/* Turn off echoing, for the start of a new command.  */

cancel_echoing ()
{
644 645 646
  current_kboard->immediate_echo = 0;
  current_kboard->echoptr = current_kboard->echobuf;
  current_kboard->echo_after_prompt = -1;
Jim Blandy's avatar
Jim Blandy committed
647 648 649 650 651 652 653
}

/* Return the length of the current echo string.  */

static int
echo_length ()
{
654
  return current_kboard->echoptr - current_kboard->echobuf;
Jim Blandy's avatar
Jim Blandy committed
655 656 657 658
}

/* Truncate the current echo message to its first LEN chars.
   This and echo_char get used by read_key_sequence when the user
Jim Blandy's avatar
Jim Blandy committed
659
   switches frames while entering a key sequence.  */
Jim Blandy's avatar
Jim Blandy committed
660 661 662 663 664

static void
echo_truncate (len)
     int len;
{
665 666
  current_kboard->echobuf[len] = '\0';
  current_kboard->echoptr = current_kboard->echobuf + len;
667
  truncate_echo_area (len);
Jim Blandy's avatar
Jim Blandy committed
668 669 670 671 672 673 674 675
}


/* Functions for manipulating this_command_keys.  */
static void
add_command_key (key)
     Lisp_Object key;
{
676 677
  int size = XVECTOR (this_command_keys)->size;

678 679 680 681 682 683 684 685 686
  /* If reset-this-command-length was called recently, obey it now.
     See the doc string of that function for an explanation of why.  */
  if (before_command_restore_flag)
    {
      this_command_key_count = before_command_key_count_1;
      echo_truncate (before_command_echo_length_1);
      before_command_restore_flag = 0;
    }

687
  if (this_command_key_count >= size)
Jim Blandy's avatar
Jim Blandy committed
688
    {
689
      Lisp_Object new_keys;
690

691
      new_keys = Fmake_vector (make_number (size * 2), Qnil);
692 693
      bcopy (XVECTOR (this_command_keys)->contents,
	     XVECTOR (new_keys)->contents,
694
	     size * sizeof (Lisp_Object));
695 696

      this_command_keys = new_keys;
Jim Blandy's avatar
Jim Blandy committed
697
    }
698 699

  XVECTOR (this_command_keys)->contents[this_command_key_count++] = key;
Jim Blandy's avatar
Jim Blandy committed
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
}

Lisp_Object
recursive_edit_1 ()
{
  int count = specpdl_ptr - specpdl;
  Lisp_Object val;

  if (command_loop_level > 0)
    {
      specbind (Qstandard_output, Qt);
      specbind (Qstandard_input, Qt);
    }

  val = command_loop ();
  if (EQ (val, Qt))
    Fsignal (Qquit, Qnil);

718
  return unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
719 720 721
}

/* When an auto-save happens, record the "time", and don't do again soon.  */
722

Jim Blandy's avatar
Jim Blandy committed
723 724
record_auto_save ()
{
725
  last_auto_save = num_nonmacro_input_chars;
Jim Blandy's avatar
Jim Blandy committed
726
}
727 728 729 730 731 732

/* Make an auto save happen as soon as possible at command level.  */

force_auto_save_soon ()
{
  last_auto_save = - auto_save_interval - 1;
733 734

  record_asynch_buffer_change ();
735
}
Jim Blandy's avatar
Jim Blandy committed
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771

DEFUN ("recursive-edit", Frecursive_edit, Srecursive_edit, 0, 0, "",
  "Invoke the editor command loop recursively.\n\
To get out of the recursive edit, a command can do `(throw 'exit nil)';\n\
that tells this function to return.\n\
Alternately, `(throw 'exit t)' makes this function signal an error.\n\
This function is called by the editor initialization to begin editing.")
  ()
{
  int count = specpdl_ptr - specpdl;
  Lisp_Object val;

  command_loop_level++;
  update_mode_lines = 1;

  record_unwind_protect (recursive_edit_unwind,
			 (command_loop_level
			  && current_buffer != XBUFFER (XWINDOW (selected_window)->buffer))
			 ? Fcurrent_buffer ()
			 : Qnil);
  recursive_edit_1 ();
  return unbind_to (count, Qnil);
}

Lisp_Object
recursive_edit_unwind (buffer)
     Lisp_Object buffer;
{
  if (!NILP (buffer))
    Fset_buffer (buffer);

  command_loop_level--;
  update_mode_lines = 1;
  return Qnil;
}

Karl Heuer's avatar
Karl Heuer committed
772
static void
773
any_kboard_state ()
Karl Heuer's avatar
Karl Heuer committed
774
{
775 776 777 778 779
#ifdef MULTI_KBOARD
#if 0 /* Theory: if there's anything in Vunread_command_events,
	 it will right away be read by read_key_sequence,
	 and then if we do switch KBOARDS, it will go into the side
	 queue then.  So we don't need to do anything special here -- rms.  */
Karl Heuer's avatar
Karl Heuer committed
780
  if (CONSP (Vunread_command_events))
781
    {
782 783 784
      current_kboard->kbd_queue
	= nconc2 (Vunread_command_events, current_kboard->kbd_queue);
      current_kboard->kbd_queue_has_data = 1;
785
    }
Karl Heuer's avatar
Karl Heuer committed
786
  Vunread_command_events = Qnil;
787 788 789
#endif
  single_kboard = 0;
#endif
Karl Heuer's avatar
Karl Heuer committed
790
}
791 792 793 794 795 796 797 798 799

/* Switch to the single-kboard state, making current_kboard
   the only KBOARD from which further input is accepted.  */

void
single_kboard_state ()
{
#ifdef MULTI_KBOARD
  single_kboard = 1;
Karl Heuer's avatar
Karl Heuer committed
800
#endif
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
}

/* Maintain a stack of kboards, so other parts of Emacs
   can switch temporarily to the kboard of a given frame
   and then revert to the previous status.  */

struct kboard_stack
{
  KBOARD *kboard;
  struct kboard_stack *next;
};

static struct kboard_stack *kboard_stack;

void
push_frame_kboard (f)
     FRAME_PTR f;
{
819
#ifdef MULTI_KBOARD
820 821 822 823 824 825 826 827
  struct kboard_stack *p
    = (struct kboard_stack *) xmalloc (sizeof (struct kboard_stack));

  p->next = kboard_stack;
  p->kboard = current_kboard;
  kboard_stack = p;

  current_kboard = FRAME_KBOARD (f);
828
#endif
829 830 831 832 833
}

void
pop_frame_kboard ()
{
834
#ifdef MULTI_KBOARD
835 836 837 838
  struct kboard_stack *p = kboard_stack;
  current_kboard = p->kboard;
  kboard_stack = p->next;
  xfree (p);
839
#endif
840 841 842 843
}

/* Handle errors that are not handled at inner levels
   by printing an error message and returning to the editor command loop.  */
Karl Heuer's avatar
Karl Heuer committed
844

Jim Blandy's avatar
Jim Blandy committed
845 846 847
Lisp_Object
cmd_error (data)
     Lisp_Object data;
848
{
849 850
  Lisp_Object old_level, old_length;

851 852 853
  Vstandard_output = Qt;
  Vstandard_input = Qt;
  Vexecuting_macro = Qnil;
854
  current_kboard->Vprefix_arg = Qnil;
855
  cancel_echoing ();
856 857 858 859 860 861

  /* Avoid unquittable loop if data contains a circular list.  */
  old_level = Vprint_level;
  old_length = Vprint_length;
  XSETFASTINT(Vprint_level, 10);
  XSETFASTINT(Vprint_length, 10);
862
  cmd_error_internal (data, NULL);
863 864
  Vprint_level = old_level;
  Vprint_length = old_length;
865 866 867 868

  Vquit_flag = Qnil;

  Vinhibit_quit = Qnil;
869
#ifdef MULTI_KBOARD
870
  any_kboard_state ();
871
#endif
872 873 874 875 876 877 878

  return make_number (0);
}

cmd_error_internal (data, context)
     Lisp_Object data;
     char *context;
Jim Blandy's avatar
Jim Blandy committed
879 880 881 882 883 884 885 886 887 888
{
  Lisp_Object errmsg, tail, errname, file_error;
  Lisp_Object stream;
  struct gcpro gcpro1;
  int i;

  Vquit_flag = Qnil;
  Vinhibit_quit = Qt;
  echo_area_glyphs = 0;

Jim Blandy's avatar
Jim Blandy committed
889
  /* If the window system or terminal frame hasn't been initialized
Jim Blandy's avatar
Jim Blandy committed
890 891
     yet, or we're not interactive, it's best to dump this message out
     to stderr and exit.  */
Jim Blandy's avatar
Jim Blandy committed
892
  if (! FRAME_MESSAGE_BUF (selected_frame)
Jim Blandy's avatar
Jim Blandy committed
893 894 895 896 897 898 899 900 901
      || noninteractive)
    stream = Qexternal_debugging_output;
  else
    {
      Fdiscard_input ();
      bitch_at_user ();
      stream = Qt;
    }

902 903 904
  if (context != 0)
    write_string_1 (context, -1, stream);

Jim Blandy's avatar
Jim Blandy committed
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
  errname = Fcar (data);

  if (EQ (errname, Qerror))
    {
      data = Fcdr (data);
      if (!CONSP (data)) data = Qnil;
      errmsg = Fcar (data);
      file_error = Qnil;
    }
  else
    {
      errmsg = Fget (errname, Qerror_message);
      file_error = Fmemq (Qfile_error,
			  Fget (errname, Qerror_conditions));
    }

  /* Print an error message including the data items.
     This is done by printing it into a scratch buffer
     and then making a copy of the text in the buffer. */

  if (!CONSP (data)) data = Qnil;
  tail = Fcdr (data);
  GCPRO1 (tail);

  /* For file-error, make error message by concatenating
     all the data items.  They are all strings.  */
  if (!NILP (file_error) && !NILP (tail))
    errmsg = XCONS (tail)->car, tail = XCONS (tail)->cdr;

934
  if (STRINGP (errmsg))
Jim Blandy's avatar
Jim Blandy committed
935 936 937 938 939 940 941 942 943 944 945 946 947 948
    Fprinc (errmsg, stream);
  else
    write_string_1 ("peculiar error", -1, stream);

  for (i = 0; CONSP (tail); tail = Fcdr (tail), i++)
    {
      write_string_1 (i ? ", " : ": ", 2, stream);
      if (!NILP (file_error))
	Fprinc (Fcar (tail), stream);
      else
	Fprin1 (Fcar (tail), stream);
    }
  UNGCPRO;

Jim Blandy's avatar
Jim Blandy committed
949
  /* If the window system or terminal frame hasn't been initialized
Jim Blandy's avatar
Jim Blandy committed
950
     yet, or we're in -batch mode, this error should cause Emacs to exit.  */
Jim Blandy's avatar
Jim Blandy committed
951
  if (! FRAME_MESSAGE_BUF (selected_frame)
Jim Blandy's avatar
Jim Blandy committed
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978
      || noninteractive)
    {
      Fterpri (stream);
      Fkill_emacs (make_number (-1));
    }
}

Lisp_Object command_loop_1 ();
Lisp_Object command_loop_2 ();
Lisp_Object top_level_1 ();

/* Entry to editor-command-loop.
   This level has the catches for exiting/returning to editor command loop.
   It returns nil to exit recursive edit, t to abort it.  */

Lisp_Object
command_loop ()
{
  if (command_loop_level > 0 || minibuf_level > 0)
    {
      return internal_catch (Qexit, command_loop_2, Qnil);
    }
  else
    while (1)
      {
	internal_catch (Qtop_level, top_level_1, Qnil);
	internal_catch (Qtop_level, command_loop_2, Qnil);
979

Jim Blandy's avatar
Jim Blandy committed
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
	/* End of file in -batch run causes exit here.  */
	if (noninteractive)
	  Fkill_emacs (Qt);
      }
}

/* Here we catch errors in execution of commands within the
   editing loop, and reenter the editing loop.
   When there is an error, cmd_error runs and returns a non-nil
   value to us.  A value of nil means that cmd_loop_1 itself
   returned due to end of file (or end of kbd macro).  */

Lisp_Object
command_loop_2 ()
{
  register Lisp_Object val;

  do
    val = internal_condition_case (command_loop_1, Qerror, cmd_error);
  while (!NILP (val));

  return Qnil;
}

Lisp_Object
top_level_2 ()
{
  return Feval (Vtop_level);
}

Lisp_Object
top_level_1 ()
{
  /* On entry to the outer level, run the startup file */
  if (!NILP (Vtop_level))
    internal_condition_case (top_level_2, Qerror, cmd_error);
  else if (!NILP (Vpurify_flag))
    message ("Bare impure Emacs (standard Lisp code not loaded)");
  else
    message ("Bare Emacs (standard Lisp code not loaded)");
  return Qnil;
}

DEFUN ("top-level", Ftop_level, Stop_level, 0, 0, "",
  "Exit all recursive editing levels.")
  ()
{
  Fthrow (Qtop_level, Qnil);
}

DEFUN ("exit-recursive-edit", Fexit_recursive_edit, Sexit_recursive_edit, 0, 0, "",
  "Exit from the innermost recursive edit or minibuffer.")
  ()
{
  if (command_loop_level > 0 || minibuf_level > 0)
    Fthrow (Qexit, Qnil);

  error ("No recursive edit is in progress");
}

DEFUN ("abort-recursive-edit", Fabort_recursive_edit, Sabort_recursive_edit, 0, 0, "",
  "Abort the command that requested this recursive edit or minibuffer input.")
  ()
{
  if (command_loop_level > 0 || minibuf_level > 0)
    Fthrow (Qexit, Qt);

  error ("No recursive edit is in progress");
}

/* This is the actual command reading loop,
   sans error-handling encapsulation.  */

Lisp_Object Fcommand_execute ();
static int read_key_sequence ();
1055
static void safe_run_hooks ();
Jim Blandy's avatar
Jim Blandy committed
1056 1057 1058 1059

Lisp_Object
command_loop_1 ()
{
1060
  Lisp_Object cmd, tem;
Jim Blandy's avatar
Jim Blandy committed
1061 1062 1063 1064 1065 1066
  int lose;
  int nonundocount;
  Lisp_Object keybuf[30];
  int i;
  int no_redisplay;
  int no_direct;
1067 1068
  int prev_modiff;
  struct buffer *prev_buffer;
1069
#ifdef MULTI_KBOARD
1070
  int was_locked = single_kboard;
1071
#endif
Jim Blandy's avatar
Jim Blandy committed
1072

1073
  current_kboard->Vprefix_arg = Qnil;
1074
  Vdeactivate_mark = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1075
  waiting_for_input = 0;
1076
  cancel_echoing ();
Jim Blandy's avatar
Jim Blandy committed
1077 1078 1079 1080 1081

  nonundocount = 0;
  no_redisplay = 0;
  this_command_key_count = 0;

1082 1083
  /* Make sure this hook runs after commands that get errors and
     throw to top level.  */
1084 1085 1086 1087
  /* Note that the value cell will never directly contain nil
     if the symbol is a local variable.  */
  if (!NILP (XSYMBOL (Qpost_command_hook)->value) && !NILP (Vrun_hooks))
    safe_run_hooks (Qpost_command_hook);
1088

1089 1090 1091
  if (!NILP (Vdeferred_action_list))
    call0 (Vdeferred_action_function);

1092
  /* Do this after running Vpost_command_hook, for consistency.  */
1093
  current_kboard->Vlast_command = this_command;
1094

Jim Blandy's avatar
Jim Blandy committed
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
  while (1)
    {
      /* Make sure the current window's buffer is selected.  */
      if (XBUFFER (XWINDOW (selected_window)->buffer) != current_buffer)
	set_buffer_internal (XBUFFER (XWINDOW (selected_window)->buffer));

      /* Display any malloc warning that just came out.  Use while because
	 displaying one warning can cause another.  */

      while (pending_malloc_warning)
	display_malloc_warning ();

      no_direct = 0;

1109 1110
      Vdeactivate_mark = Qnil;

Jim Blandy's avatar
Jim Blandy committed
1111
      /* If minibuffer on and echo area in use,
1112
	 wait 2 sec and redraw minibuffer.  */
Jim Blandy's avatar
Jim Blandy committed
1113

1114 1115
      if (minibuf_level && echo_area_glyphs
	  && EQ (minibuf_window, echo_area_window))
Jim Blandy's avatar
Jim Blandy committed
1116
	{
1117 1118 1119 1120
	  /* Bind inhibit-quit to t so that C-g gets read in
	     rather than quitting back to the minibuffer.  */
	  int count = specpdl_ptr - specpdl;
	  specbind (Qinhibit_quit, Qt);
Jim Blandy's avatar
Jim Blandy committed
1121
	  Fsit_for (make_number (2), Qnil, Qnil);
1122
	  unbind_to (count, Qnil);
1123

Jim Blandy's avatar
Jim Blandy committed
1124 1125 1126 1127 1128
	  echo_area_glyphs = 0;
	  no_direct = 1;
	  if (!NILP (Vquit_flag))
	    {
	      Vquit_flag = Qnil;
1129
	      Vunread_command_events = Fcons (make_number (quit_char), Qnil);
Jim Blandy's avatar
Jim Blandy committed
1130 1131 1132 1133
	    }
	}

#ifdef C_ALLOCA
1134
      alloca (0);		/* Cause a garbage collection now */
Jim Blandy's avatar
Jim Blandy committed
1135 1136 1137
				/* Since we can free the most stuff here.  */
#endif /* C_ALLOCA */

1138
#if 0
Jim Blandy's avatar
Jim Blandy committed
1139
#ifdef MULTI_FRAME
1140 1141 1142 1143
      /* Select the frame that the last event came from.  Usually,
	 switch-frame events will take care of this, but if some lisp
	 code swallows a switch-frame event, we'll fix things up here.
	 Is this a good idea?  */
1144
      if (FRAMEP (internal_last_event_frame)
1145 1146
	  && XFRAME (internal_last_event_frame) != selected_frame)
	Fselect_frame (internal_last_event_frame, Qnil);
1147
#endif
Jim Blandy's avatar
Jim Blandy committed
1148
#endif
1149 1150
      /* If it has changed current-menubar from previous value,
	 really recompute the menubar from the value.  */
1151 1152
      if (! NILP (Vlucid_menu_bar_dirty_flag)
	  && !NILP (Ffboundp (Qrecompute_lucid_menubar)))
1153 1154
	call0 (Qrecompute_lucid_menubar);

1155 1156 1157
      before_command_key_count = this_command_key_count;
      before_command_echo_length = echo_length ();

1158
      /* Read next key sequence; i gets its length.  */
1159 1160
      i = read_key_sequence (keybuf, sizeof keybuf / sizeof keybuf[0],
			     Qnil, 0, 1);
1161 1162 1163

      ++num_input_keys;

Jim Blandy's avatar
Jim Blandy committed
1164 1165 1166 1167 1168
      /* Now we have read a key sequence of length I,
	 or else I is 0 and we found end of file.  */

      if (i == 0)		/* End of file -- happens only in */
	return Qnil;		/* a kbd macro, at the end.  */
1169 1170 1171 1172 1173 1174
      /* -1 means read_key_sequence got a menu that was rejected.
	 Just loop around and read another command.  */
      if (i == -1)
	{
	  cancel_echoing ();
	  this_command_key_count = 0;
1175
	  goto finalize;
1176
	}
Jim Blandy's avatar
Jim Blandy committed
1177 1178 1179

      last_command_char = keybuf[i - 1];

1180 1181
      /* If the previous command tried to force a specific window-start,
	 forget about that, in case this command moves point far away
1182 1183 1184 1185 1186 1187 1188 1189
	 from that position.  But also throw away beg_unchanged and
	 end_unchanged information in that case, so that redisplay will
	 update the whole window properly.  */
      if (!NILP (XWINDOW (selected_window)->force_start))
	{
	  XWINDOW (selected_window)->force_start = Qnil;
	  beg_unchanged = end_unchanged = 0;
	}
1190

Jim Blandy's avatar
Jim Blandy committed
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
      cmd = read_key_sequence_cmd;
      if (!NILP (Vexecuting_macro))
	{
	  if (!NILP (Vquit_flag))
	    {
	      Vexecuting_macro = Qt;
	      QUIT;		/* Make some noise. */
				/* Will return since macro now empty. */
	    }
	}

      /* Do redisplay processing after this command except in special
1203 1204 1205
	 cases identified below that set no_redisplay to 1.
	 (actually, there's currently no way to prevent the redisplay,
	 and no_redisplay is ignored.
1206
	 Perhaps someday we will really implement it.)  */
Jim Blandy's avatar
Jim Blandy committed
1207 1208
      no_redisplay = 0;

1209 1210
      prev_buffer = current_buffer;
      prev_modiff = MODIFF;
1211
      last_point_position = PT;
1212
      XSETBUFFER (last_point_position_buffer, prev_buffer);
1213

Jim Blandy's avatar
Jim Blandy committed
1214 1215
      /* Execute the command.  */

1216
      this_command = cmd;
1217 1218 1219 1220
      /* Note that the value cell will never directly contain nil
	 if the symbol is a local variable.  */
      if (!NILP (XSYMBOL (Qpre_command_hook)->value) && !NILP (Vrun_hooks))
	safe_run_hooks (Qpre_command_hook);
1221

1222
      if (NILP (this_command))
Jim Blandy's avatar
Jim Blandy committed
1223 1224 1225
	{
	  /* nil means key is undefined.  */
	  bitch_at_user ();
1226
	  current_kboard->defining_kbd_macro = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1227
	  update_mode_lines = 1;
1228
	  current_kboard->Vprefix_arg = Qnil;
Jim Blandy's avatar
Jim Blandy committed
1229 1230 1231
	}
      else
	{
1232
	  if (NILP (current_kboard->Vprefix_arg) && ! no_direct)
Jim Blandy's avatar
Jim Blandy committed
1233 1234 1235
	    {
	      /* Recognize some common commands in common situations and
		 do them directly.  */
Karl Heuer's avatar
Karl Heuer committed
1236
	      if (EQ (this_command, Qforward_char) && PT < ZV)
Jim Blandy's avatar
Jim Blandy committed
1237 1238 1239
		{
                  struct Lisp_Vector *dp
		    = window_display_table (XWINDOW (selected_window));
Karl Heuer's avatar
Karl Heuer committed
1240 1241
		  lose = FETCH_CHAR (PT);
		  SET_PT (PT + 1);
1242
		  if ((dp
1243
		       ? (VECTORP (DISP_CHAR_VECTOR (dp, lose))
1244 1245 1246
			  ? XVECTOR (DISP_CHAR_VECTOR (dp, lose))->size == 1
                          : (NILP (DISP_CHAR_VECTOR (dp, lose))
                             && (lose >= 0x20 && lose < 0x7f)))
1247
		       : (lose >= 0x20 && lose < 0x7f))
Jim Blandy's avatar
Jim Blandy committed
1248 1249 1250
		      && (XFASTINT (XWINDOW (selected_window)->last_modified)
			  >= MODIFF)
		      && (XFASTINT (XWINDOW (selected_window)->last_point)