keyboard.c 100 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Keyboard and mouse input; editor command loop.
Jim Blandy's avatar
Jim Blandy committed
2
   Copyright (C) 1985, 1986, 1987, 1988, 1989, 1992 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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.  */

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

#include "config.h"
#include <stdio.h>
#undef NULL
#include "termchar.h"
#include "termopts.h"
#include "lisp.h"
#include "termhooks.h"
#include "macros.h"
Jim Blandy's avatar
Jim Blandy committed
31
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
32 33 34 35 36 37 38 39 40 41 42 43
#include "window.h"
#include "commands.h"
#include "buffer.h"
#include "disptab.h"
#include "keyboard.h"
#include <setjmp.h>
#include <errno.h>

#ifndef VMS
#include <sys/ioctl.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
44 45
#include "syssignal.h"
#include "systerm.h"
Jim Blandy's avatar
Jim Blandy committed
46
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
47 48 49

extern int errno;

Jim Blandy's avatar
Jim Blandy committed
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
#ifdef HAVE_X_WINDOWS
extern Lisp_Object Vmouse_grabbed;

/* 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;
  };

/* Non-nil disable property on a command means
   do not execute it; call disabled-command-hook's value instead.  */
Lisp_Object Qdisabled, Vdisabled_command_hook;

#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 */
Lisp_Object recent_keys[NUM_RECENT_KEYS]; /* Holds last 100 keystrokes */

/* Buffer holding the key that invoked the current command.  */
Lisp_Object *this_command_keys;
int this_command_key_count;	/* Size in use.  */
int this_command_keys_size;	/* Size allocated.  */

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;

/* Nonzero means C-G should cause immediate error-signal.  */
int immediate_quit;

/* Character to recognize as the help char.  */
Lisp_Object help_char;

/* Form to execute when help char is typed.  */
Lisp_Object Vhelp_form;

/* 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;

/* 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;

/* Last input character read for any purpose.  */
Lisp_Object last_input_char;

/* If not Qnil, an object to be read as the next command input.  */
Lisp_Object unread_command_char;

/* 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;

158
/* Number of idle seconds before an auto-save and garbage collection.  */
Jim Blandy's avatar
Jim Blandy committed
159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
static Lisp_Object Vauto_save_timeout;

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

/* Auto-save automatically when this many characters have been typed
   since the last time.  */

static int auto_save_interval;

/* Value of num_input_chars as of last auto save.  */

int last_auto_save;

/* Last command executed by the editor command loop, not counting
   commands that set the prefix argument.  */

Lisp_Object last_command;

/* The command being executed by the command loop.
   Commands may set this, and the value set will be copied into last_command
   instead of the actual command.  */
Lisp_Object this_command;

#ifndef HAVE_X11
/* Window of last mouse click.  */
extern Lisp_Object Vmouse_window;

/* List containing details of last mouse click.  */
extern Lisp_Object Vmouse_event;
#endif /* defined HAVE_X11 */

/* Hook to call on each mouse event after running its definition.  */
Lisp_Object Vmouse_event_function;

Jim Blandy's avatar
Jim Blandy committed
194
/* Hook to call when mouse leaves frame.  */
Jim Blandy's avatar
Jim Blandy committed
195 196
Lisp_Object Vmouse_left_hook;

Jim Blandy's avatar
Jim Blandy committed
197 198
/* Hook to call when a frame is mapped.  */
Lisp_Object Vmap_frame_hook;
Jim Blandy's avatar
Jim Blandy committed
199

Jim Blandy's avatar
Jim Blandy committed
200 201
/* Hook to call when a frame is unmapped.  */
Lisp_Object Vunmap_frame_hook;
Jim Blandy's avatar
Jim Blandy committed
202 203 204 205

/* Handler for non-grabbed (no keys depressed) mouse motion.  */
Lisp_Object Vmouse_motion_handler;

Jim Blandy's avatar
Jim Blandy committed
206 207
/* The frame in which the last input event occurred.
   command_loop_1 will select this frame before running the
Jim Blandy's avatar
Jim Blandy committed
208 209
   command bound to an event sequence, and read_key_sequence will
   toss the existing prefix if the user starts typing at a
Jim Blandy's avatar
Jim Blandy committed
210 211
   new frame.  */
Lisp_Object Vlast_event_frame;
Jim Blandy's avatar
Jim Blandy committed
212

Jim Blandy's avatar
Jim Blandy committed
213 214
/* 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
215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
unsigned long last_event_timestamp;

Lisp_Object Qself_insert_command;
Lisp_Object Qforward_char;
Lisp_Object Qbackward_char;

/* 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;

/* File in which we write all commands we read.  */
FILE *dribble;

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

/* Nonzero if should obey 0200 bit in input chars as "Meta".  */
int meta_key;

extern char *pending_malloc_warning;

/* Circular buffer for pre-read keyboard input.  */
static struct input_event kbd_buffer[KBD_BUFFER_SIZE];

/* 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 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_write_count.  When we
   dequeue a non-hook event, we increment kbd_read_count.  We say that
   there is input available iff the two counters are 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.  */

/* If this flag is non-zero, mouse movement events will appear in the
   input stream.  If is zero, mouse movement will be ignored.  */
int do_mouse_tracking;

/* The window system handling code should set this if the mouse has
   moved since the last call to the mouse_position_hook.  Calling that
   hook should clear this.  Code assumes that if this is set, it can
   call mouse_position_hook to get the promised position, so don't set
   it unless you're prepared to substantiate the claim!  */
int mouse_moved;

/* True iff there is an event in kbd_buffer, or if mouse tracking is
   enabled and there is a new mouse position in the mouse movement
   buffer.  Note that if this is false, that doesn't mean that there
   is readable input; all the events in the queue might be button-up
   events, and do_mouse_tracking might be off.  */
#define EVENT_QUEUES_EMPTY \
  ((kbd_fetch_ptr == kbd_store_ptr) && (!do_mouse_tracking || !mouse_moved))


/* Symbols to head events.  */
Lisp_Object Qmouse_movement;

Lisp_Object Qvscrollbar_part;
Lisp_Object Qvslider_part;
Lisp_Object Qvthumbup_part;
Lisp_Object Qvthumbdown_part;

Lisp_Object Qhscrollbar_part;
Lisp_Object Qhslider_part;
Lisp_Object Qhthumbleft_part;
Lisp_Object Qhthumbright_part;

/* Symbols to denote kinds of events.  */
Lisp_Object Qfunction_key;
Lisp_Object Qmouse_click;
/* Lisp_Object Qmouse_movement; - also an event header */
Lisp_Object Qscrollbar_click;

/* Properties of event headers.  */
Lisp_Object Qevent_kind;
Lisp_Object Qevent_unmodified;

/* Symbols to use for non-text mouse positions.  */
Lisp_Object Qmode_line;
Jim Blandy's avatar
Jim Blandy committed
313
Lisp_Object Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
314 315


Jim Blandy's avatar
Jim Blandy committed
316 317 318
/* 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
319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496

/* 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

/* If we support X Windows, and won't get an interrupt when input
   arrives from the server, poll periodically so we can detect C-g.  */
#ifdef HAVE_X_WINDOWS
#ifndef SIGIO
#define POLL_FOR_INPUT
#endif
#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 ();

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

/* Nonzero means echo each character as typed.  */
static int immediate_echo;

/* The text we're echoing in the modeline - partial key sequences,
   usually.  '\0'-terminated.  */
static char echobuf[100];

/* Where to append more text to echobuf if we want to.  */
static char *echoptr;

#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);
  if (len > sizeof echobuf - 4)
    len = sizeof echobuf - 4;
  bcopy (str, echobuf, len + 1);
  echoptr = echobuf + len;

  echo ();
}

/* Add C to the echo string, if echoing is going on.  
   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 ();

  if (immediate_echo)
    {
      char *ptr = echoptr;
      
      if (ptr != echobuf)
	*ptr++ = ' ';

      /* If someone has passed us a composite event, use its head symbol.  */
      if (EVENT_HAS_PARAMETERS (c))
	c = EVENT_HEAD (c);

      if (XTYPE (c) == Lisp_Int)
	{
	  if (ptr - echobuf > sizeof echobuf - 6)
	    return;

	  ptr = push_key_description (c, ptr);
	}
      else if (XTYPE (c) == Lisp_Symbol)
	{
	  struct Lisp_String *name = XSYMBOL (c)->name;
	  if (((ptr - echobuf) + name->size + 4) > sizeof echobuf)
	    return;
	  bcopy (name->data, ptr, name->size);
	  ptr += name->size;
	}

      if (echoptr == echobuf && c == help_char)
	{
	  strcpy (ptr, " (Type ? for further options)");
	  ptr += strlen (ptr);
	}

      *ptr = 0;
      echoptr = ptr;

      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 ()
{
  if (!immediate_echo && echoptr == echobuf)
    return;

  /* Put a dash at the end of the buffer temporarily,
     but make it go away when the next character is added.  */
  echoptr[0] = '-';
  echoptr[1] = 0;

  echo ();
}

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

echo ()
{
  if (!immediate_echo)
    {
      int i;
      immediate_echo = 1;

      for (i = 0; i < this_command_key_count; i++)
	echo_char (this_command_keys[i]);
      echo_dash ();
    }

  echoing = 1;
  message1 (echobuf);
  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 ()
{
  immediate_echo = 0;
  echoptr = echobuf;
}

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

static int
echo_length ()
{
  return echoptr - echobuf;
}

/* 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
497
   switches frames while entering a key sequence.  */
Jim Blandy's avatar
Jim Blandy committed
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602

static void
echo_truncate (len)
     int len;
{
  echobuf[len] = '\0';
  echoptr = echobuf + strlen (echobuf);
}


/* Functions for manipulating this_command_keys.  */
static void
add_command_key (key)
     Lisp_Object key;
{
  if (this_command_key_count == this_command_keys_size)
    {
      this_command_keys_size *= 2;
      this_command_keys
	= (Lisp_Object *) xrealloc (this_command_keys,
				    (this_command_keys_size
				     * sizeof (Lisp_Object)));
    }
  this_command_keys[this_command_key_count++] = key;
}

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);

  unbind_to (count);
  return Qnil;
}

/* When an auto-save happens, record the "time", and don't do again soon.  */
record_auto_save ()
{
  last_auto_save = num_input_chars;
}

Lisp_Object recursive_edit_unwind (), command_loop ();

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;
}

Lisp_Object
cmd_error (data)
     Lisp_Object data;
{
  Lisp_Object errmsg, tail, errname, file_error;
  Lisp_Object stream;
  struct gcpro gcpro1;
  int i;

  Vquit_flag = Qnil;
  Vinhibit_quit = Qt;
  Vstandard_output = Qt;
  Vstandard_input = Qt;
  Vexecuting_macro = Qnil;
  echo_area_glyphs = 0;

Jim Blandy's avatar
Jim Blandy committed
603
  /* If the window system or terminal frame hasn't been initialized
Jim Blandy's avatar
Jim Blandy committed
604 605
     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
606
  if (! FRAME_MESSAGE_BUF (selected_frame)
Jim Blandy's avatar
Jim Blandy committed
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
      || noninteractive)
    stream = Qexternal_debugging_output;
  else
    {
      Fdiscard_input ();
      bitch_at_user ();
      stream = Qt;
    }

  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;

  if (XTYPE (errmsg) == Lisp_String)
    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
660
  /* If the window system or terminal frame hasn't been initialized
Jim Blandy's avatar
Jim Blandy committed
661
     yet, or we're in -batch mode, this error should cause Emacs to exit.  */
Jim Blandy's avatar
Jim Blandy committed
662
  if (! FRAME_MESSAGE_BUF (selected_frame)
Jim Blandy's avatar
Jim Blandy committed
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
      || noninteractive)
    {
      Fterpri (stream);
      Fkill_emacs (make_number (-1));
    }

  Vquit_flag = Qnil;

  Vinhibit_quit = Qnil;
  return make_number (0);
}

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);
	
	/* 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 ();

Lisp_Object
command_loop_1 ()
{
  Lisp_Object cmd;
  int lose;
  int nonundocount;
  Lisp_Object keybuf[30];
  int i;
  int no_redisplay;
  int no_direct;

  Vprefix_arg = Qnil;
  waiting_for_input = 0;
  cancel_echoing ();

  /* Don't clear out last_command at the beginning of a macro.  */
  if (XTYPE (Vexecuting_macro) != Lisp_String)
    last_command = Qt;

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

  while (1)
    {
      /* Install chars successfully executed in kbd macro.  */

      if (defining_kbd_macro && NILP (Vprefix_arg))
	finalize_kbd_macro_chars ();

      /* 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;

      /* If minibuffer on and echo area in use,
	 wait 2 sec and redraw minibufer.  */

      if (minibuf_level && echo_area_glyphs)
	{
	  Fsit_for (make_number (2), Qnil, Qnil);
	  echo_area_glyphs = 0;
	  no_direct = 1;
	  if (!NILP (Vquit_flag))
	    {
	      Vquit_flag = Qnil;
	      unread_command_char = make_number (quit_char);
	    }
	}

#ifdef C_ALLOCA
	  alloca (0);		/* Cause a garbage collection now */
				/* Since we can free the most stuff here.  */
#endif /* C_ALLOCA */

      /* Read next key sequence; i gets its length.  */
      i = read_key_sequence (keybuf, (sizeof keybuf / sizeof (keybuf[0])), 0);

      ++num_input_keys;

Jim Blandy's avatar
Jim Blandy committed
839 840 841 842 843
#ifdef MULTI_FRAME
      /* Select the frame that the key sequence came from.  */
      if (XTYPE (Vlast_event_frame) == Lisp_Frame
	  && XFRAME (Vlast_event_frame) != selected_frame)
	Fselect_frame (Vlast_event_frame, Qnil);
Jim Blandy's avatar
Jim Blandy committed
844 845 846 847 848 849 850 851 852 853
#endif

      /* 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.  */

#if 0
#ifdef HAVE_X_WINDOWS
854
      if (FRAME_X_P (selected_frame))
Jim Blandy's avatar
Jim Blandy committed
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
	{
	  if (i == -1)		/* Mouse event */
	    {
	      nonundocount = 0;
	      if (NILP (Vprefix_arg) && NILP (Vexecuting_macro) &&
		  !EQ (minibuf_window, selected_window))
		Fundo_boundary ();

	      if (defining_kbd_macro)
		{
		  /* Be nice if this worked...  */
		}
	      Fexecute_mouse_event (read_key_sequence_cmd);
	      no_redisplay = 0;
	      goto directly_done;
	    }

	  if (i == -2)		/* Lisp Symbol */
	    {
	      nonundocount = 0;
	      if (NILP (Vprefix_arg) && NILP (Vexecuting_macro) &&
		  !EQ (minibuf_window, selected_window))
		Fundo_boundary ();
 
	      goto directly_done;
	    }
	}
#endif /* HAVE_X_WINDOWS */
#endif

      last_command_char = keybuf[i - 1];

      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
	 cases identified below that set no_redisplay to 1.  */
      no_redisplay = 0;

      /* Execute the command.  */

      if (NILP (cmd))
	{
	  /* nil means key is undefined.  */
	  bitch_at_user ();
	  defining_kbd_macro = 0;
	  update_mode_lines = 1;
	  Vprefix_arg = Qnil;
	}
      else
	{
	  this_command = cmd;
	  if (NILP (Vprefix_arg) && ! no_direct)
	    {
	      /* Recognize some common commands in common situations and
		 do them directly.  */
	      if (EQ (cmd, Qforward_char) && point < ZV)
		{
                  struct Lisp_Vector *dp
		    = window_display_table (XWINDOW (selected_window));
		  lose = FETCH_CHAR (point);
		  SET_PT (point + 1);
		  if (((dp == 0 && lose >= 040 && lose < 0177)
		       ||
		       (dp && (XTYPE (dp->contents[lose]) != Lisp_String
			       || XSTRING (dp->contents[lose])->size == sizeof (GLYPH))))
		      && (XFASTINT (XWINDOW (selected_window)->last_modified)
			  >= MODIFF)
		      && (XFASTINT (XWINDOW (selected_window)->last_point)
			  == point - 1)
		      && !windows_or_buffers_changed
		      && EQ (current_buffer->selective_display, Qnil)
		      && !detect_input_pending ()
		      && NILP (Vexecuting_macro))
		    no_redisplay = direct_output_forward_char (1);
		  goto directly_done;
		}
	      else if (EQ (cmd, Qbackward_char) && point > BEGV)
		{
                  struct Lisp_Vector *dp
		    = window_display_table (XWINDOW (selected_window));
		  SET_PT (point - 1);
		  lose = FETCH_CHAR (point);
		  if (((dp == 0 && lose >= 040 && lose < 0177)
		       ||
		       (dp && (XTYPE (dp->contents[lose]) != Lisp_String
			       || XSTRING (dp->contents[lose])->size == sizeof (GLYPH))))
		      && (XFASTINT (XWINDOW (selected_window)->last_modified)
			  >= MODIFF)
		      && (XFASTINT (XWINDOW (selected_window)->last_point)
			  == point + 1)
		      && !windows_or_buffers_changed
		      && EQ (current_buffer->selective_display, Qnil)
		      && !detect_input_pending ()
		      && NILP (Vexecuting_macro))
		    no_redisplay = direct_output_forward_char (-1);
		  goto directly_done;
		}
	      else if (EQ (cmd, Qself_insert_command)
		       /* Try this optimization only on ascii keystrokes.  */
		       && XTYPE (last_command_char) == Lisp_Int)
		{
		  unsigned char c = XINT (last_command_char);

		  if (NILP (Vexecuting_macro) &&
		      !EQ (minibuf_window, selected_window))
		    {
		      if (!nonundocount || nonundocount >= 20)
			{
			  Fundo_boundary ();
			  nonundocount = 0;
			}
		      nonundocount++;
		    }
		  lose = (XFASTINT (XWINDOW (selected_window)->last_modified)
			  < MODIFF)
		    || (XFASTINT (XWINDOW (selected_window)->last_point)
			  != point)
		    || MODIFF <= current_buffer->save_modified
		    || windows_or_buffers_changed
		    || !EQ (current_buffer->selective_display, Qnil)
		    || detect_input_pending ()
		    || !NILP (Vexecuting_macro);
		  if (internal_self_insert (c, 0))
		    {
		      lose = 1;
		      nonundocount = 0;
		    }
		  if (!lose &&
		      (point == ZV || FETCH_CHAR (point) == '\n'))
		    {
		      struct Lisp_Vector *dp
			= window_display_table (XWINDOW (selected_window));

		      if (dp == 0 || XTYPE (dp->contents[c]) != Lisp_String)
			no_redisplay = direct_output_for_insert (c);
		      else if (XSTRING (dp->contents[c])->size
			       == sizeof (GLYPH))
		        no_redisplay =
			  direct_output_for_insert (*(GLYPH *)XSTRING (dp->contents[c])->data);
		    }
		  goto directly_done;
		}
	    }

	  /* Here for a command that isn't executed directly */

	  nonundocount = 0;
	  if (NILP (Vprefix_arg))
	    Fundo_boundary ();
	  Fcommand_execute (cmd, Qnil);

	}
Jim Blandy's avatar
Jim Blandy committed
1016
    directly_done: ;
Jim Blandy's avatar
Jim Blandy committed
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 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151

      /* If there is a prefix argument,
	 1) We don't want last_command to be ``universal-argument''
	 (that would be dumb), so don't set last_command,
	 2) we want to leave echoing on so that the prefix will be
	 echoed as part of this key sequence, so don't call
	 cancel_echoing, and
	 3) we want to leave this_command_key_count non-zero, so that
	 read_char will realize that it is re-reading a character, and
	 not echo it a second time.  */
      if (NILP (Vprefix_arg))
	{
	  last_command = this_command;
	  cancel_echoing ();
	  this_command_key_count = 0;
	}
    }
}

/* Number of seconds between polling for input.  */
int polling_period;

/* Nonzero means polling for input is temporarily suppresed.  */
int poll_suppress_count;

#ifdef POLL_FOR_INPUT
int polling_for_input;

/* Handle an alarm once each second and read pending input
   so as to handle a C-g if it comces in.  */

SIGTYPE
input_poll_signal ()
{
#ifdef HAVE_X_WINDOWS
  extern int x_input_blocked;
  if (x_input_blocked == 0)
#endif
    if (!waiting_for_input)
      read_avail_input (0);
  signal (SIGALRM, input_poll_signal);
  alarm (polling_period);
}

#endif

/* Begin signals to poll for input, if they are appropriate.
   This function is called unconditionally from various places.  */

start_polling ()
{
#ifdef POLL_FOR_INPUT
  if (read_socket_hook)
    {
      poll_suppress_count--;
      if (poll_suppress_count == 0)
	{
	  signal (SIGALRM, input_poll_signal);
	  polling_for_input = 1;
	  alarm (polling_period);
	}
    }
#endif
}

/* Turn off polling.  */

stop_polling ()
{
#ifdef POLL_FOR_INPUT
  if (read_socket_hook)
    {
      if (poll_suppress_count == 0)
	{
	  polling_for_input = 0;
	  alarm (0);
	}
      poll_suppress_count++;
    }
#endif
}

/* Input of single characters from keyboard */

Lisp_Object print_help ();
static Lisp_Object kbd_buffer_get_event ();

/* read a character from the keyboard; call the redisplay if needed */
/* commandflag 0 means do not do auto-saving, but do do redisplay.
   -1 means do not do redisplay, but do do autosaving.
   1 means do both.  */

Lisp_Object
read_char (commandflag)
     int commandflag;
{
  register Lisp_Object c;
  int count;
  jmp_buf save_jump;

  if (!NILP (unread_command_char))
    {
      c = unread_command_char;
      unread_command_char = Qnil;

#if 0       /* We're not handling mouse keys specially anymore. */
      if (!EQ (XTYPE (obj), Lisp_Int)) /* Mouse thing */
	{
	  num_input_chars++;
	  last_input_char = 0;
	  return obj;
	}
#endif

      if (this_command_key_count == 0)
	goto reread_first;
      else
	goto reread;
    }

  if (!NILP (Vexecuting_macro))
    {
      if (executing_macro_index >= Flength (Vexecuting_macro))
	{
	  XSET (c, Lisp_Int, -1);
	  return c;
	}
      
      c = Faref (Vexecuting_macro, make_number (executing_macro_index));
      executing_macro_index++;

      goto from_macro;
    }

  /* Save outer setjmp data, in case called recursively.  */
Jim Blandy's avatar
Jim Blandy committed
1152
  save_getcjmp (save_jump);
Jim Blandy's avatar
Jim Blandy committed
1153 1154 1155 1156 1157 1158 1159 1160 1161

  stop_polling ();

  if (commandflag >= 0 && !input_pending && !detect_input_pending ())
    redisplay ();

  if (_setjmp (getcjmp))
    {
      XSET (c, Lisp_Int, quit_char);
Jim Blandy's avatar
Jim Blandy committed
1162 1163
#ifdef MULTI_FRAME
      XSET (Vlast_event_frame, Lisp_Frame, selected_frame);
Jim Blandy's avatar
Jim Blandy committed
1164
#endif
Jim Blandy's avatar
Jim Blandy committed
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183

      goto non_reread;
    }

  /* Message turns off echoing unless more keystrokes turn it on again. */
  if (echo_area_glyphs && *echo_area_glyphs && echo_area_glyphs != echobuf)
    cancel_echoing ();
  else
    /* If already echoing, continue.  */
    echo_dash ();

  /* If in middle of key sequence and minibuffer not active,
     start echoing if enough time elapses.  */
  if (minibuf_level == 0 && !immediate_echo && this_command_key_count > 0
      && echo_keystrokes > 0
      && (echo_area_glyphs == 0 || *echo_area_glyphs == 0))
    {
      Lisp_Object tem0;

Jim Blandy's avatar
Jim Blandy committed
1184
      tem0 = sit_for (echo_keystrokes, 0, 1, 1);
Jim Blandy's avatar
Jim Blandy committed
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
      if (EQ (tem0, Qt))
	echo ();
    }

  /* Maybe auto save due to number of keystrokes or idle time.  */

  if (commandflag != 0
      && auto_save_interval > 0
      && num_input_chars - last_auto_save > max (auto_save_interval, 20)
      && !detect_input_pending ())
    {
      jmp_buf temp;
      save_getcjmp (temp);
      Fdo_auto_save (Qnil, Qnil);
      restore_getcjmp (temp);
    }

  /* Slow down auto saves logarithmically in size of current buffer,
     and garbage collect while we're at it.  */
  {
    int delay_level, buffer_size;

    if (! MINI_WINDOW_P (XWINDOW (selected_window)))
      last_non_minibuf_size = Z - BEG;
    buffer_size = (last_non_minibuf_size >> 8) + 1;
    delay_level = 0;
    while (buffer_size > 64)
      delay_level++, buffer_size -= buffer_size >> 2;
    if (delay_level < 4) delay_level = 4;
    /* delay_level is 4 for files under around 50k, 7 at 100k,
       9 at 200k, 11 at 300k, and 12 at 500k.  It is 15 at 1 meg.  */

    /* Auto save if enough time goes by without input.  */
    if (commandflag != 0
	&& num_input_chars > last_auto_save
	&& XTYPE (Vauto_save_timeout) == Lisp_Int
	&& XINT (Vauto_save_timeout) > 0)
      {
	Lisp_Object tem0;
	int delay = delay_level * XFASTINT (Vauto_save_timeout) / 4;
Jim Blandy's avatar
Jim Blandy committed
1225
	tem0 = sit_for (delay, 0, 1, 1);
Jim Blandy's avatar
Jim Blandy committed
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
	if (EQ (tem0, Qt))
	  {
	    jmp_buf temp;
	    save_getcjmp (temp);
	    Fdo_auto_save (Qnil, Qnil);
	    restore_getcjmp (temp);

	    /* If we have auto-saved and there is still no input
	       available, garbage collect if there has been enough
	       consing going on to make it worthwhile.  */
	    if (!detect_input_pending ()
		&& consing_since_gc > gc_cons_threshold / 2)
	      Fgarbage_collect ();
	  }
      }
  }

  /* Actually read a character, waiting if necessary.  */
  c = kbd_buffer_get_event ();

  if (NILP (c))
    abort ();			/* Don't think this can happen. */

#if 0 /* I think that all the different kinds of events should be
	 handled together now... */
  if (XTYPE (c) != Lisp_Int)
    {
      start_polling ();
      return c;
    }
  c = XINT (obj);
#endif

  /* Terminate Emacs in batch mode if at eof.  */
  if (noninteractive && c < 0)
    Fkill_emacs (make_number (1));

 non_reread:

Jim Blandy's avatar
Jim Blandy committed
1265
  restore_getcjmp (save_jump);
Jim Blandy's avatar
Jim Blandy committed
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347

  start_polling ();

  echo_area_glyphs = 0;

  /* Handle things that only apply to characters.  */
  if (XTYPE (c) == Lisp_Int)
    {
      /* If kbd_buffer_get_event gave us an EOF, return that.  */
      if (XINT (c) < 0)
	return c;

      /* Strip the high bits, and maybe the meta bit too.  */
      XSETINT (c, c & (meta_key ? 0377 : 0177));

      if (XTYPE (Vkeyboard_translate_table) == Lisp_String
	  && XSTRING (Vkeyboard_translate_table)->size > XINT (c))
	XSETINT (c, XSTRING (Vkeyboard_translate_table)->data[c]);
    }

  total_keys++;
  recent_keys[recent_keys_index] = c;
  if (++recent_keys_index >= (sizeof (recent_keys)/sizeof(recent_keys[0])))
    recent_keys_index = 0;

  /* Write c to the dribble file.  If c is a lispy event, write
     the event's symbol to the dribble file, in <brackets>.  Bleaugh.
     If you, dear reader, have a better idea, you've got the source.  :-) */
  if (dribble)
    {
      if (XTYPE (c) == Lisp_Int)
	putc (c, dribble);
      else
	{
	  Lisp_Object dribblee = c;

	  /* If it's a structured event, take the event header.  */
	  if (EVENT_HAS_PARAMETERS (dribblee))
	    dribblee = EVENT_HEAD (dribblee);

	  if (XTYPE (c) == Lisp_Symbol)
	    {
	      putc ('<', dribble);
	      fwrite (XSYMBOL (c)->name->data, sizeof (char),
		      XSYMBOL (c)->name->size,
		      dribble);
	      putc ('>', dribble);
	    }
	}

      fflush (dribble);
    }

  store_kbd_macro_char (c);

 from_macro:
 reread_first:
  echo_char (c);

  /* Record this character as part of the current key.  */
  add_command_key (c);

  /* Re-reading in the middle of a command */
 reread:
  last_input_char = c;
  num_input_chars++;

  /* Process the help character specially if enabled */
  if (EQ (c, help_char) && !NILP (Vhelp_form))
    {
      Lisp_Object tem0;
      count = specpdl_ptr - specpdl;

      record_unwind_protect (Fset_window_configuration,
			     Fcurrent_window_configuration (Qnil));

      tem0 = Feval (Vhelp_form);
      if (XTYPE (tem0) == Lisp_String)
	internal_with_output_to_temp_buffer ("*Help*", print_help, tem0);

      cancel_echoing ();
      c = read_char (0);
Jim Blandy's avatar
Jim Blandy committed
1348
      /* Remove the help from the frame */
Jim Blandy's avatar
Jim Blandy committed
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
      unbind_to (count, Qnil);
      redisplay ();
      if (EQ (c, make_number (040)))
	{
	  cancel_echoing ();
	  c = read_char (0);
	}
    }

  return c;
}

Lisp_Object
print_help (object)
     Lisp_Object object;
{
  Fprinc (object, Qnil);
  return Qnil;
}

/* Copy out or in the info on where C-g should throw to.
   This is used when running Lisp code from within get_char,
   in case get_char is called recursively.
   See read_process_output.  */

save_getcjmp (temp)
     jmp_buf temp;
{
  bcopy (getcjmp, temp, sizeof getcjmp);
}

restore_getcjmp (temp)
     jmp_buf temp;
{
  bcopy (temp, getcjmp, sizeof getcjmp);
}


/* Low level keyboard/mouse input.
   kbd_buffer_store_event places events in kbd_buffer, and
   kbd_buffer_get_event retrieves them.
   mouse_moved indicates when the mouse has moved again, and
   *mouse_position_hook provides the mouse position.  */

/* Set this for debugging, to have a way to get out */
int stop_character;

Jim Blandy's avatar
Jim Blandy committed
1396
extern int frame_garbaged;
Jim Blandy's avatar
Jim Blandy committed
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454

/* Return true iff there are any events in the queue that read-char
   would return.  If this returns false, a read-char would block.  */
static int
readable_events ()
{
  struct input_event *ep;

  if (EVENT_QUEUES_EMPTY)
    return 0;

  if (do_mouse_tracking)
    return 1;

  /* Mouse tracking is disabled, so we need to actually scan the
     input queue to see if any events are currently readable.  */
  for (ep = kbd_fetch_ptr; ep != kbd_store_ptr; ep++)
    {
      if (ep == kbd_buffer + KBD_BUFFER_SIZE)
	ep = kbd_buffer;
	
      /* Skip button-up events.  */
      if ((ep->kind == mouse_click || ep->kind == scrollbar_click)
	  && (ep->modifiers & up_modifier))
	continue;

      return 1;
    }
    
  return 0;
}


/* Restore mouse tracking enablement.  See Ftrack_mouse for the only use
   of this function.  */
static Lisp_Object
tracking_off (old_value)
     Lisp_Object old_value;
{
  if (! XFASTINT (old_value))
    {
      do_mouse_tracking = 0;

      /* Redisplay may have been preempted because there was input
	 available, and it assumes it will be called again after the
	 input has been processed.  If the only input available was
	 the sort that we have just disabled, then we need to call
	 redisplay.  */
      if (!readable_events ())
	{
	  redisplay_preserve_echo_area ();
	  get_input_pending (&input_pending);
	}
    }
}

DEFUN ("track-mouse", Ftrack_mouse, Strack_mouse, 0, UNEVALLED, 0,
  "Evaluate BODY with mouse movement and button release events enabled.\n\
1455 1456 1457
Within a `track-mouse', mouse motion and button releases generate input\n\
events that you can read with `read-event'.\n\
Normally, these occurrences don't generate events.")
Jim Blandy's avatar
Jim Blandy committed
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
  (args)
     Lisp_Object args;
{
  int count = specpdl_ptr - specpdl;
  Lisp_Object val;

  XSET (val, Lisp_Int, do_mouse_tracking);
  record_unwind_protect (tracking_off, val);

  do_mouse_tracking = 1;
  
  val = Fprogn (args);
  return unbind_to (count, val);
}

/* Store an event obtained at interrupt level into kbd_buffer, fifo */

void
kbd_buffer_store_event (event)
     register struct input_event *event;
{
  if (event->kind == no_event)
    abort ();

  if (event->kind == ascii_keystroke)
    {
      register int c = XFASTINT (event->code) & 0377;

      if (c == quit_char
	  || ((c == (0200 | quit_char)) && !meta_key))
	{
	  /* If this results in a quit_char being returned to Emacs as
Jim Blandy's avatar
Jim Blandy committed
1490
	     input, set last-event-frame properly.  If this doesn't
Jim Blandy's avatar
Jim Blandy committed
1491
	     get returned to Emacs as an event, the next event read
Jim Blandy's avatar
Jim Blandy committed
1492
	     will set Vlast_event_frame again, so this is safe to do.  */
Jim Blandy's avatar
Jim Blandy committed
1493
	  extern SIGTYPE interrupt_signal ();
Jim Blandy's avatar
Jim Blandy committed
1494
	  Vlast_event_frame = FRAME_FOCUS_FRAME (event->frame);
Jim Blandy's avatar
Jim Blandy committed
1495
	  last_event_timestamp = event->timestamp;
Jim Blandy's avatar
Jim Blandy committed
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
	  interrupt_signal ();
	  return;
	}

      if (c && c == stop_character)
	{
	  sys_suspend ();
	  return;
	}

      XSET (event->code, Lisp_Int, c);
    }

  if (kbd_store_ptr - kbd_buffer == KBD_BUFFER_SIZE)
    kbd_store_ptr = kbd_buffer;

  /* Don't let the very last slot in the buffer become full,
     since that would make the two pointers equal,
     and that is indistinguishable from an empty buffer.
     Discard the event if it would fill the last slot.  */
  if (kbd_fetch_ptr - 1 != kbd_store_ptr)
    {
      kbd_store_ptr->kind = event->kind;
      kbd_store_ptr->code = event->code;
      kbd_store_ptr->part = event->part;
Jim Blandy's avatar
Jim Blandy committed
1521
      kbd_store_ptr->frame = event->frame;
Jim Blandy's avatar
Jim Blandy committed
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
      kbd_store_ptr->modifiers = event->modifiers;
      kbd_store_ptr->x = event->x;
      kbd_store_ptr->y = event->y;
      kbd_store_ptr->timestamp = event->timestamp;

      kbd_store_ptr++;
    }
}

static Lisp_Object make_lispy_event ();
static Lisp_Object make_lispy_movement ();
static Lisp_Object modify_event_symbol ();

static Lisp_Object
kbd_buffer_get_event ()
{
  register int c;
  Lisp_Object obj;

  if (noninteractive)
    {
      c = getchar ();
      XSET (obj, Lisp_Int, c);
      return obj;
    }

  /* Wait until there is input available.  */
  for (;;)
    {

      /* Process or toss any events that we don't want to return as
	 input.  The fact that we remove undesirable events here
	 allows us to use EVENT_QUEUES_EMPTY in the rest of this loop.  */
      if (! do_mouse_tracking)
	while (kbd_fetch_ptr != kbd_store_ptr)
	  {
	    if (kbd_fetch_ptr == kbd_buffer + KBD_BUFFER_SIZE)
	      kbd_fetch_ptr = kbd_buffer;

	    if (kbd_fetch_ptr->kind == mouse_click
		|| kbd_fetch_ptr->kind == scrollbar_click)
	      {
		if ((kbd_fetch_ptr->modifiers & up_modifier) == 0)
		  break;
	      }
	    else
	      break;

	    kbd_fetch_ptr++;
	  }

      if (!EVENT_QUEUES_EMPTY)
	break;

      /* If the quit flag is set, then read_char will return
	 quit_char, so that counts as "available input."  */
      if (!NILP (Vquit_flag))
	quit_throw_to_read_char ();

      /* One way or another, wait until input is available; then, if
	 interrupt handlers have not read it, read it now.  */

#ifdef OLDVMS
      wait_for_kbd_input ();
#else
/* Note SIGIO has been undef'd if FIONREAD is missing.  */
#ifdef SIGIO
      gobble_input (0);
#endif /* SIGIO */
      if (EVENT_QUEUES_EMPTY)
	{
Jim Blandy's avatar
Jim Blandy committed
1593 1594 1595 1596
	  Lisp_Object minus_one;

	  XSET (minus_one, Lisp_Int, -1);
	  wait_reading_process_input (0, 0, minus_one, 1);
Jim Blandy's avatar
Jim Blandy committed
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612

	  if (!interrupt_input && EVENT_QUEUES_EMPTY)
	    {
	      read_avail_input (0);
	    }
	}
#endif /* not VMS */
    }

  /* At this point, we know that there is a readable event available
     somewhere.  If the event queue is empty, then there must be a
     mouse movement enabled and available.  */
  if (kbd_fetch_ptr != kbd_store_ptr)
    {
      if (kbd_fetch_ptr == kbd_buffer + KBD_BUFFER_SIZE)
	kbd_fetch_ptr = kbd_buffer;
Jim Blandy's avatar
Jim Blandy committed
1613
      /* Do the redirection specified by the focus_frame
Jim Blandy's avatar
Jim Blandy committed
1614
	 member now, before we return this event.  */
Jim Blandy's avatar
Jim Blandy committed
1615 1616 1617
      kbd_fetch_ptr->frame =
	XFRAME (FRAME_FOCUS_FRAME (kbd_fetch_ptr->frame));
      XSET (Vlast_event_frame, Lisp_Frame, kbd_fetch_ptr->frame);
Jim Blandy's avatar
Jim Blandy committed
1618
      last_event_timestamp = kbd_fetch_ptr->timestamp;
Jim Blandy's avatar
Jim Blandy committed
1619 1620 1621 1622 1623 1624 1625 1626
      obj = make_lispy_event (kbd_fetch_ptr);
      kbd_fetch_ptr->kind = no_event;
      kbd_fetch_ptr++;
      if (XTYPE (obj) == Lisp_Int)
	XSET (obj, Lisp_Int, XINT (obj) & (meta_key ? 0377 : 0177));
    }
  else if (do_mouse_tracking && mouse_moved)
    {
Jim Blandy's avatar
Jim Blandy committed
1627
      FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
1628 1629
      Lisp_Object x, y;
      unsigned long time;
Jim Blandy's avatar
Jim Blandy committed
1630

Jim Blandy's avatar
Jim Blandy committed
1631 1632
      (*mouse_position_hook) (&frame, &x, &y, &time);
      XSET (Vlast_event_frame, Lisp_Frame, frame);
Jim Blandy's avatar
Jim Blandy committed
1633

Jim Blandy's avatar
Jim Blandy committed
1634
      obj = make_lispy_movement (frame, x, y, time);
Jim Blandy's avatar
Jim Blandy committed
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
    }
  else
    /* We were promised by the above while loop that there was
       something for us to read!  */
    abort ();

  input_pending = readable_events ();

  return (obj);
}

/* Caches for modify_event_symbol.  */
static Lisp_Object func_key_syms;
static Lisp_Object mouse_syms;

/* You'll notice that this table is arranged to be conveniently
   indexed by X Windows keysym values.  */
static char *lispy_function_keys[] =
  {
    /* X Keysym value */

    "home",			/* 0xff50 */	/* IsCursorKey */
    "left",
    "up",
    "right",
    "down",
    "prior",
    "next",
    "end",
    "begin",
    0,				/* 0xff59 */
    0, 0, 0, 0, 0, 0,
    "select",			/* 0xff60 */	/* IsMiscFunctionKey */
    "print",
    "execute",
    "insert",
    0,		/* 0xff64 */
    "undo",
    "redo",
    "menu",
    "find",
    "cancel",
    "help",
    "break",			/* 0xff6b */

    /* Here are some keys found mostly on HP keyboards.  The X event
       handling code will strip bit 29, which flags vendor-specific
       keysyms.  */
    "reset",			/* 0x1000ff6c */
    "system",
    "user",
    "clearline",
    "insertline",
    "deleteline",
    "insertchar",
    "deletechar",
    "backtab",
    "kp_backtab",		/* 0x1000ff75 */
    0,				/* 0xff76 */
    0, 0, 0, 0, 0, 0, 0, 0, 0,	/* 0xff7f */
    "kp-space",			/* 0xff80 */	/* IsKeypadKey */
    0, 0, 0, 0, 0, 0, 0, 0,
    "kp-tab",			/* 0xff89 */
    0, 0, 0,
    "kp-enter",			/* 0xff8d */
    0, 0, 0,
    "kp-f1",			/* 0xff91 */
    "kp-f2",
    "kp-f3",
    "kp-f4",
    0,		/* 0xff95 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    "kp-multiply",		/* 0xffaa */
    "kp-add",
    "kp-separator",
    "kp-subtract",
    "kp-decimal",
    "kp-divide",		/* 0xffaf */
    "kp-0",			/* 0xffb0 */
    "kp-1",	"kp-2",	"kp-3",	"kp-4",	"kp-5",	"kp-6",	"kp-7",	"kp-8",	"kp-9",
    0,		/* 0xffba */
    0, 0,
    "kp-equal",			/* 0xffbd */
    "f1",			/* 0xffbe */	/* IsFunctionKey */
    "f2",	"f3",	"f4",
    "f5",	"f6",	"f7",	"f8",	"f9",	"f10",	"f11",	"f12",
    "f13",	"f14",	"f15",	"f16",	"f17",	"f18",	"f19",	"f20",
    "f21",	"f22",	"f23",	"f24",	"f25",	"f26",	"f27",	"f28",
    "f29",	"f30",	"f31",	"f32",	"f33",	"f34",	"f35"	/* 0xffe0 */
    };

static char *lispy_mouse_names[] = 
{
  "mouse-1", "mouse-2", "mouse-3", "mouse-4", "mouse-5"
};

/* Given a struct input_event, build the lisp event which represents
   it.  If EVENT is 0, build a mouse movement event from the mouse
   movement buffer, which should have a movement event in it.  */

static Lisp_Object
make_lispy_event (event)
     struct input_event *event;
{
#ifdef SWITCH_ENUM_BUG
  switch ((int) event->kind)
#else
  switch (event->kind)
#endif
    {

      /* A simple keystroke.  */
    case ascii_keystroke:
      return event->code;
      break;

      /* A function key.  The symbol may need to have modifier prefixes
	 tacked onto it.  */
    case non_ascii_keystroke:
      return modify_event_symbol (XFASTINT (event->code), event->modifiers,
				  Qfunction_key,
				  lispy_function_keys, &func_key_syms,
				  (sizeof (lispy_function_keys)
				   / sizeof (lispy_function_keys[0])));
      break;

      /* A mouse click - build a list of the relevant information.  */
    case mouse_click:
      {
	int part;
	Lisp_Object window =
Jim Blandy's avatar
Jim Blandy committed
1766
	  window_from_coordinates (event->frame,
Jim Blandy's avatar
Jim Blandy committed
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782
				   XINT (event->x), XINT (event->y),
				   &part);
	Lisp_Object posn;

	if (XTYPE (window) != Lisp_Window)
	  posn = Qnil;
	else
	  {
	    XSETINT (event->x, (XINT (event->x)
				- XINT (XWINDOW (window)->left)));
	    XSETINT (event->y, (XINT (event->y)
				- XINT (XWINDOW (window)->top)));

	    if (part == 1)
	      posn = Qmode_line;
	    else if (part == 2)
Jim Blandy's avatar
Jim Blandy committed
1783
	      posn = Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
	    else
	      XSET (posn, Lisp_Int,
		    buffer_posn_from_coords (XWINDOW (window),
					     XINT (event->x),
					     XINT (event->y)));
	  }

	return Fcons (modify_event_symbol (XFASTINT (event->code) - 1,
					   event->modifiers,
					   Qmouse_click,
					   lispy_mouse_names, &mouse_syms,
					   (sizeof (lispy_mouse_names)
					    / sizeof (lispy_mouse_names[0]))),
		      Fcons (window,
			     Fcons (posn,
				    Fcons (Fcons (event->x, event->y),
Jim Blandy's avatar
Jim Blandy committed
1800 1801
					   Fcons (make_number
						  (event->timestamp),
Jim Blandy's avatar
Jim Blandy committed
1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
						  Qnil)))));
      }

      /* A scrollbar click.  Build a list containing the relevant
	 information.  */
    case scrollbar_click:
      {
	Lisp_Object button
	  = modify_event_symbol (XFASTINT (event->code) - 1,
				 event->modifiers,
				 Qmouse_click,
				 lispy_mouse_names, &mouse_syms,
				 (sizeof (lispy_mouse_names)
				  / sizeof (lispy_mouse_names[0])));
	return Fcons (event->part,
Jim Blandy's avatar
Jim Blandy committed
1817
		      Fcons (FRAME_SELECTED_WINDOW (event->frame),
Jim Blandy's avatar
Jim Blandy committed
1818 1819
			     Fcons (button,
				    Fcons (Fcons (event->x, event->y),
Jim Blandy's avatar
Jim Blandy committed
1820 1821
					   Fcons (make_number
						  (event->timestamp),
Jim Blandy's avatar
Jim Blandy committed
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831
						  Qnil)))));
      }

      /* The 'kind' field of the event is something we don't recognize.  */
    default:
      abort();
    }
}

static Lisp_Object
Jim Blandy's avatar
Jim Blandy committed
1832 1833
make_lispy_movement (frame, x, y, time)
     FRAME_PTR frame;
Jim Blandy's avatar
Jim Blandy committed
1834
     Lisp_Object x, y;
Jim Blandy's avatar
Jim Blandy committed
1835
     unsigned long time;
Jim Blandy's avatar
Jim Blandy committed
1836 1837 1838 1839 1840 1841 1842 1843
{
  Lisp_Object window;
  int ix, iy;
  Lisp_Object posn;
  int part;

  ix = XINT (x);
  iy = XINT (y);
Jim Blandy's avatar
Jim Blandy committed
1844 1845
  window = (frame
	    ? window_from_coordinates (frame, ix, iy, &part)
Jim Blandy's avatar
Jim Blandy committed
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855
	    : Qnil);
  if (XTYPE (window) != Lisp_Window)
    posn = Qnil;
  else
    {
      ix -= XINT (XWINDOW (window)->left);
      iy -= XINT (XWINDOW (window)->top);
      if (part == 1)
	posn = Qmode_line;
      else if (part == 2)
Jim Blandy's avatar
Jim Blandy committed
1856
	posn = Qvertical_line;
Jim Blandy's avatar
Jim Blandy committed
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
      else
	XSET (posn, Lisp_Int, buffer_posn_from_coords (XWINDOW (window),
						       ix, iy));
    }

  XSETINT (x, ix);
  XSETINT (y, iy);
  return Fcons (Qmouse_movement,
		Fcons (window,
		       Fcons (posn,
			      Fcons (Fcons (x, y),
Jim Blandy's avatar
Jim Blandy committed
1868
				     Fcons (make_number (time), Qnil)))));
Jim Blandy's avatar
Jim Blandy committed
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
}



/* Place the written representation of MODIFIERS in BUF, '\0'-terminated,
   and return its length.  */

static int
format_modifiers (modifiers, buf)
     int modifiers;
     char *buf;
{
  char *p = buf;

  if (modifiers & ctrl_modifier) { *p++ = 'C'; *p++ = '-'; }
Jim Blandy's avatar
Jim Blandy committed
1884
  if (modifiers & meta_modifier) { *p++ = 'M'; *p++ = '-'; }
Jim Blandy's avatar
Jim Blandy committed
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998