Mercurial > hg > xemacs-beta
annotate src/cmdloop.c @ 4974:fe0d3106cc36
fix compile problems in bytecode.c when no error-check-byte-code (issue 666)
-------------------- ChangeLog entries follow: --------------------
src/ChangeLog addition:
2010-02-05 Ben Wing <ben@xemacs.org>
* bytecode.c (bytecode_assert):
Use 0 instead of x in disabled_assert calls to avoid errors due
to using undefined vars/params (they are defined only when
ERROR_CHECK_BYTE_CODE, which also turns on/off the asserts).
| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Fri, 05 Feb 2010 04:07:47 -0600 |
| parents | 3465c3161fea |
| children | 838630c0734f |
| rev | line source |
|---|---|
| 428 | 1 /* Editor command loop. |
| 2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc. | |
|
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3 Copyright (C) 1995, 1996, 2001, 2002, 2003, 2005 Ben Wing. |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
| 7 XEmacs is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2, or (at your option) any | |
| 10 later version. | |
| 11 | |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with XEmacs; see the file COPYING. If not, write to | |
| 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 20 Boston, MA 02111-1307, USA. */ | |
| 21 | |
| 22 /* Synched up with: Mule 2.0. Not synched with FSF. | |
| 23 This was renamed from keyboard.c. However, it only contains the | |
| 24 command-loop stuff from FSF's keyboard.c; all the rest is in | |
| 25 event*.c, console.c, or signal.c. */ | |
| 26 | |
| 27 /* #### This module purports to separate out the command-loop stuff | |
| 28 from event-stream.c, but it doesn't really. Perhaps this file | |
| 29 should just be merged into event-stream.c, given its shortness. */ | |
| 30 | |
| 31 #include <config.h> | |
| 32 #include "lisp.h" | |
| 33 | |
| 34 #include "buffer.h" | |
| 872 | 35 #include "console-impl.h" |
| 800 | 36 #include "device.h" |
| 428 | 37 #include "commands.h" |
| 38 #include "frame.h" | |
| 39 #include "events.h" | |
| 40 #include "window.h" | |
| 41 | |
| 872 | 42 #ifdef HAVE_MS_WINDOWS |
| 43 #include "console-msw.h" | |
| 44 #endif | |
| 45 | |
| 428 | 46 /* Current depth in recursive edits. */ |
| 458 | 47 Fixnum command_loop_level; |
| 428 | 48 |
| 49 #ifndef LISP_COMMAND_LOOP | |
| 50 /* Form to evaluate (if non-nil) when Emacs is started. */ | |
| 51 Lisp_Object Vtop_level; | |
| 52 #else | |
| 53 /* Function to call to evaluate to read and process events. */ | |
| 54 Lisp_Object Vcommand_loop; | |
| 55 #endif /* LISP_COMMAND_LOOP */ | |
| 56 | |
| 57 Lisp_Object Venter_window_hook, Vleave_window_hook; | |
| 58 | |
| 733 | 59 Lisp_Object Qdisabled_command_hook, Vdisabled_command_hook; |
| 60 | |
| 428 | 61 /* The error handler. */ |
| 62 Lisp_Object Qcommand_error; | |
| 63 | |
| 64 /* The emergency error handler, before we're ready. */ | |
| 65 Lisp_Object Qreally_early_error_handler; | |
| 66 | |
| 67 /* Variable defined in Lisp. */ | |
| 68 Lisp_Object Qerrors_deactivate_region; | |
| 69 | |
| 70 Lisp_Object Qtop_level; | |
| 1703 | 71 Lisp_Object Vminibuffer_echo_wait_function; |
| 428 | 72 |
| 2268 | 73 #ifdef LISP_COMMAND_LOOP |
| 428 | 74 static Lisp_Object command_loop_1 (Lisp_Object dummy); |
| 75 EXFUN (Fcommand_loop_1, 0); | |
| 2268 | 76 #else |
| 77 static DECLARE_DOESNT_RETURN_TYPE (Lisp_Object, | |
| 78 command_loop_1 (Lisp_Object dummy)); | |
| 79 EXFUN_NORETURN (Fcommand_loop_1, 0); | |
| 80 #endif | |
| 428 | 81 |
| 82 /* There are two possible command loops -- one written entirely in | |
| 83 C and one written mostly in Lisp, except stuff written in C for | |
| 84 speed. The advantage of the Lisp command loop is that the user | |
| 85 can specify their own command loop to use by changing the variable | |
| 86 `command-loop'. Its disadvantage is that it's slow. */ | |
| 87 | |
| 88 static Lisp_Object | |
| 89 default_error_handler (Lisp_Object data) | |
| 90 { | |
| 91 int speccount = specpdl_depth (); | |
| 92 | |
| 93 /* None of this is invoked, normally. This code is almost identical | |
| 94 to the `command-error' function, except `command-error' does cool | |
| 95 tricks with sounds. This function is a fallback, invoked if | |
| 96 command-error is unavailable. */ | |
| 97 | |
| 98 Fding (Qnil, Qnil, Qnil); | |
| 99 | |
| 100 if (!NILP (Fboundp (Qerrors_deactivate_region)) | |
| 101 && !NILP (Fsymbol_value (Qerrors_deactivate_region))) | |
| 102 zmacs_deactivate_region (); | |
| 103 Fdiscard_input (); | |
| 104 specbind (Qinhibit_quit, Qt); | |
| 105 Vstandard_output = Qt; | |
| 106 Vstandard_input = Qt; | |
| 107 Vexecuting_macro = Qnil; | |
| 108 Fset (intern ("last-error"), data); | |
| 109 clear_echo_area (selected_frame (), Qnil, 0); | |
| 110 Fdisplay_error (data, Qt); | |
| 111 check_quit (); /* make Vquit_flag accurate */ | |
| 112 Vquit_flag = Qnil; | |
| 771 | 113 return (unbind_to_1 (speccount, Qt)); |
| 428 | 114 } |
| 115 | |
| 2268 | 116 DEFUN_NORETURN ("really-early-error-handler", Freally_early_error_handler, |
| 117 1, 1, 0, /* | |
| 428 | 118 You should almost certainly not be using this. |
| 119 */ | |
| 120 (x)) | |
| 121 { | |
| 122 /* This is an error handler used when we're running temacs and when | |
| 123 we're in the early stages of XEmacs. No errors ought to be | |
| 124 occurring in those cases (or they ought to be trapped and | |
| 125 dealt with elsewhere), but if an error slips through, we need | |
| 126 to deal with it. We could write this function in Lisp (and it | |
| 127 used to be this way, at the beginning of loadup.el), but we do | |
| 128 it this way in case an error occurs before we get to loading | |
| 129 loadup.el. Note that there is also an `early-error-handler', | |
| 130 used in startup.el to catch more reasonable errors that | |
| 131 might occur during startup if the sysadmin or whoever fucked | |
| 132 up. This function is more conservative in what it does | |
| 133 and is used only as a last resort, indicating that the | |
| 134 programmer himself fucked up somewhere. */ | |
| 135 stderr_out ("*** Error in XEmacs initialization"); | |
| 136 Fprint (x, Qexternal_debugging_output); | |
| 137 stderr_out ("*** Backtrace\n"); | |
| 138 Fbacktrace (Qexternal_debugging_output, Qt); | |
| 139 stderr_out ("*** Killing XEmacs\n"); | |
|
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140 #ifdef DEBUG_XEMACS |
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141 /* When configured --with-debug, and debug-on-error is set, exit to the |
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142 debugger and abort. This will happen during loadup/dumping. There is |
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143 also code in signal_call_debugger() to do the same whenever running |
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144 noninteractively. That's intended for use debugging e.g. batch byte |
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145 compilation, AFTER dumping has already happened, where the XEMACSDEBUG |
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146 variable can be set to '(setq debug-on-error t)' to trigger the |
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147 behavior. |
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148 |
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149 Why do we need to duplicate the bomb-out check here? Well, |
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150 signal_call_debugger() doesn't want to bomb out unless it has an |
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151 uncaught error, and in this case, we've installed a |
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152 call-with-condition-case handler, and so signal_call_debugger() can't |
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153 bomb out before calling us. If we returned and let the error be |
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154 processed further, it *would* trigger the bomb-out-to-debugger |
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155 behavior, but in fact it never gets there because we do `kill-emacs'. |
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156 Therefore, we have to provide the bomb-to-debugger feature |
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157 ourselves. */ |
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158 if (!NILP (Vdebug_on_error)) |
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159 { |
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160 stderr_out ("XEmacs exiting to debugger.\n"); |
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161 Fforce_debugging_signal (Qt); |
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162 } |
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163 #endif |
| 442 | 164 #ifdef HAVE_MS_WINDOWS |
| 771 | 165 Fmswindows_message_box (build_msg_string ("Initialization error"), |
| 442 | 166 Qnil, Qnil); |
| 167 #endif | |
| 2268 | 168 Fkill_emacs (make_int (-1)); |
| 169 RETURN_NOT_REACHED (Qnil); | |
| 428 | 170 } |
| 171 | |
| 172 | |
| 173 /**********************************************************************/ | |
| 174 /* Command-loop (in C) */ | |
| 175 /**********************************************************************/ | |
| 176 | |
| 177 #ifndef LISP_COMMAND_LOOP | |
| 178 | |
| 179 /* The guts of the command loop are in command_loop_1(). This function | |
| 180 doesn't catch errors, though -- that's the job of command_loop_2(), | |
| 181 which is a condition-case wrapper around command_loop_1(). | |
| 182 command_loop_1() never returns, but may get thrown out of. | |
| 183 | |
| 184 When an error occurs, cmd_error() is called, which usually | |
| 185 invokes the Lisp error handler in `command-error'; however, | |
| 186 a default error handler is provided if `command-error' is nil | |
| 187 (e.g. during startup). The purpose of the error handler is | |
| 188 simply to display the error message and do associated cleanup; | |
| 189 it does not need to throw anywhere. When the error handler | |
| 190 finishes, the condition-case in command_loop_2() will finish and | |
| 191 command_loop_2() will reinvoke command_loop_1(). | |
| 192 | |
| 193 command_loop_2() is invoked from three places: from | |
| 194 initial_command_loop() (called from main() at the end of | |
| 195 internal initialization), from the Lisp function `recursive-edit', | |
| 196 and from call_command_loop(). | |
| 197 | |
| 198 call_command_loop() is called when a macro is started and when the | |
| 199 minibuffer is entered; normal termination of the macro or | |
| 200 minibuffer causes a throw out of the recursive command loop. (To | |
| 3025 | 201 `execute-kbd-macro' for macros and `exit' for minibuffers. Note also |
| 428 | 202 that the low-level minibuffer-entering function, |
| 203 `read-minibuffer-internal', provides its own error handling and | |
| 204 does not need command_loop_2()'s error encapsulation; so it tells | |
| 205 call_command_loop() to invoke command_loop_1() directly.) | |
| 206 | |
| 207 Note that both read-minibuffer-internal and recursive-edit set | |
| 3025 | 208 up a catch for `exit'; this is why `abort-recursive-edit', which |
| 428 | 209 throws to this catch, exits out of either one. |
| 210 | |
| 211 initial_command_loop(), called from main(), sets up a catch | |
| 3025 | 212 for `top-level' when invoking command_loop_2(), allowing functions |
| 428 | 213 to throw all the way to the top level if they really need to. |
| 214 Before invoking command_loop_2(), initial_command_loop() calls | |
| 215 top_level_1(), which handles all of the startup stuff (creating | |
| 216 the initial frame, handling the command-line options, loading | |
| 217 the user's .emacs file, etc.). The function that actually does this | |
| 218 is in Lisp and is pointed to by the variable `top-level'; | |
| 219 normally this function is `normal-top-level'. top_level_1() is | |
| 220 just an error-handling wrapper similar to command_loop_2(). | |
| 3025 | 221 Note also that initial_command_loop() sets up a catch for `top-level' |
| 428 | 222 when invoking top_level_1(), just like when it invokes |
| 223 command_loop_2(). */ | |
| 224 | |
| 225 | |
| 226 static Lisp_Object | |
| 2286 | 227 cmd_error (Lisp_Object data, Lisp_Object UNUSED (dummy)) |
| 428 | 228 { |
| 229 /* This function can GC */ | |
| 230 check_quit (); /* make Vquit_flag accurate */ | |
| 231 Vquit_flag = Qnil; | |
| 232 | |
| 233 any_console_state (); | |
| 234 | |
| 235 if (!NILP (Ffboundp (Qcommand_error))) | |
| 236 return call1 (Qcommand_error, data); | |
| 237 | |
| 238 return default_error_handler (data); | |
| 239 } | |
| 240 | |
| 241 static Lisp_Object | |
| 2286 | 242 top_level_1 (Lisp_Object UNUSED (dummy)) |
| 428 | 243 { |
| 244 /* This function can GC */ | |
| 245 /* On entry to the outer level, run the startup file */ | |
| 246 if (!NILP (Vtop_level)) | |
| 247 condition_case_1 (Qerror, Feval, Vtop_level, cmd_error, Qnil); | |
| 248 #if 1 | |
| 249 else | |
| 250 { | |
| 251 message ("\ntemacs can only be run in -batch mode."); | |
| 252 noninteractive = 1; /* prevent things under kill-emacs from blowing up */ | |
| 253 Fkill_emacs (make_int (-1)); | |
| 254 } | |
| 255 #else | |
| 256 else if (purify_flag) | |
| 257 message ("Bare impure Emacs (standard Lisp code not loaded)"); | |
| 258 else | |
| 259 message ("Bare Emacs (standard Lisp code not loaded)"); | |
| 260 #endif | |
| 261 | |
| 262 return Qnil; | |
| 263 } | |
| 264 | |
| 265 /* Here we catch errors in execution of commands within the | |
| 266 editing loop, and reenter the editing loop. | |
| 267 When there is an error, cmd_error runs and the call | |
| 268 to condition_case_1() returns. */ | |
| 269 | |
| 270 /* Avoid confusing the compiler. A helper function for command_loop_2 */ | |
| 2268 | 271 static DECLARE_DOESNT_RETURN (command_loop_3 (void)); |
| 272 | |
| 428 | 273 static DOESNT_RETURN |
| 274 command_loop_3 (void) | |
| 275 { | |
| 276 /* | |
| 1268 | 277 * If we are inside of a menu callback we cannot reenter the command loop |
| 278 * because we will deadlock, as no input is allowed. | |
| 428 | 279 */ |
| 1268 | 280 if (in_modal_loop) |
| 281 invalid_operation ("Attempt to enter command loop inside menu callback", | |
| 282 Qunbound); | |
| 428 | 283 /* This function can GC */ |
| 284 for (;;) | |
| 285 { | |
| 286 condition_case_1 (Qerror, command_loop_1, Qnil, cmd_error, Qnil); | |
| 287 /* #### wrong with selected-console? */ | |
| 288 /* See command in initial_command_loop about why this value | |
| 289 is 0. */ | |
| 290 reset_this_command_keys (Vselected_console, 0); | |
| 291 } | |
| 292 } | |
| 293 | |
| 2268 | 294 static DECLARE_DOESNT_RETURN_TYPE (Lisp_Object, command_loop_2 (Lisp_Object)); |
| 295 | |
| 296 static DOESNT_RETURN_TYPE (Lisp_Object) | |
| 2286 | 297 command_loop_2 (Lisp_Object UNUSED (dummy)) |
| 428 | 298 { |
| 299 command_loop_3(); /* doesn't return */ | |
| 2268 | 300 RETURN_NOT_REACHED (Qnil); |
| 428 | 301 } |
| 302 | |
| 303 /* This is called from emacs.c when it's done with initialization. */ | |
| 304 | |
| 305 DOESNT_RETURN | |
| 306 initial_command_loop (Lisp_Object load_me) | |
| 307 { | |
| 308 /* This function can GC */ | |
| 309 if (!NILP (load_me)) | |
| 310 Vtop_level = list2 (Qload, load_me); | |
| 311 | |
| 312 /* First deal with startup and command-line arguments. A throw | |
| 3025 | 313 to `top-level' gets us back here directly (does this ever happen?). |
| 428 | 314 Otherwise, this function will return normally when all command- |
| 315 line arguments have been processed, the user's initialization | |
| 316 file has been read in, and the first frame has been created. */ | |
| 2532 | 317 internal_catch (Qtop_level, top_level_1, Qnil, 0, 0, 0); |
| 428 | 318 |
| 319 /* If an error occurred during startup and the initial console | |
| 320 wasn't created, then die now (the error was already printed out | |
| 321 on the terminal device). */ | |
| 322 if (!noninteractive && | |
| 323 (!CONSOLEP (Vselected_console) || | |
| 324 CONSOLE_STREAM_P (XCONSOLE (Vselected_console)))) | |
| 325 Fkill_emacs (make_int (-1)); | |
| 326 | |
| 327 /* End of -batch run causes exit here. */ | |
| 328 if (noninteractive) | |
| 329 Fkill_emacs (Qt); | |
| 330 | |
| 331 for (;;) | |
| 332 { | |
| 333 command_loop_level = 0; | |
| 334 MARK_MODELINE_CHANGED; | |
| 335 /* Now invoke the command loop. It never returns; however, a | |
| 3025 | 336 throw to `top-level' will place us at the end of this loop. */ |
| 2532 | 337 internal_catch (Qtop_level, command_loop_2, Qnil, 0, 0, 0); |
| 428 | 338 /* #### wrong with selected-console? */ |
| 339 /* We don't actually call clear_echo_area() here, partially | |
| 340 at least because that runs Lisp code and it may be unsafe | |
| 341 to do so -- we are outside of the normal catches for | |
| 342 errors and such. */ | |
| 343 reset_this_command_keys (Vselected_console, 0); | |
| 344 } | |
| 345 } | |
| 346 | |
| 347 /* This function is invoked when a macro or minibuffer starts up. | |
| 348 Normal termination of the macro or minibuffer causes a throw past us. | |
| 349 See the comment above. | |
| 350 | |
| 351 Note that this function never returns (but may be thrown out of). */ | |
| 352 | |
| 2268 | 353 DOESNT_RETURN_TYPE (Lisp_Object) |
| 428 | 354 call_command_loop (Lisp_Object catch_errors) |
| 355 { | |
| 356 /* This function can GC */ | |
| 357 if (NILP (catch_errors)) | |
| 2268 | 358 command_loop_1 (Qnil); |
| 428 | 359 else |
| 2268 | 360 command_loop_2 (Qnil); |
| 361 RETURN_NOT_REACHED (Qnil); | |
| 428 | 362 } |
| 363 | |
| 364 static Lisp_Object | |
| 365 recursive_edit_unwind (Lisp_Object buffer) | |
| 366 { | |
| 367 if (!NILP (buffer)) | |
| 368 Fset_buffer (buffer); | |
| 369 | |
| 370 command_loop_level--; | |
| 371 MARK_MODELINE_CHANGED; | |
| 372 | |
| 373 return Qnil; | |
| 374 } | |
| 375 | |
| 376 DEFUN ("recursive-edit", Frecursive_edit, 0, 0, "", /* | |
| 377 Invoke the editor command loop recursively. | |
| 378 To get out of the recursive edit, a command can do `(throw 'exit nil)'; | |
| 379 that tells this function to return. | |
| 380 Alternately, `(throw 'exit t)' makes this function signal an error. | |
| 381 */ | |
| 382 ()) | |
| 383 { | |
| 384 /* This function can GC */ | |
| 385 Lisp_Object val; | |
| 386 int speccount = specpdl_depth (); | |
| 387 | |
| 388 command_loop_level++; | |
| 389 MARK_MODELINE_CHANGED; | |
| 390 | |
| 391 record_unwind_protect (recursive_edit_unwind, | |
| 872 | 392 current_buffer |
| 393 != XWINDOW_XBUFFER (Fselected_window (Qnil)) | |
| 428 | 394 ? Fcurrent_buffer () |
| 872 | 395 : Qnil); |
| 428 | 396 |
| 397 specbind (Qstandard_output, Qt); | |
| 398 specbind (Qstandard_input, Qt); | |
| 399 | |
| 2532 | 400 val = internal_catch (Qexit, command_loop_2, Qnil, 0, 0, 0); |
| 428 | 401 |
| 402 if (EQ (val, Qt)) | |
| 403 /* Turn abort-recursive-edit into a quit. */ | |
| 404 Fsignal (Qquit, Qnil); | |
| 405 | |
| 771 | 406 return unbind_to (speccount); |
| 428 | 407 } |
| 408 | |
| 409 #endif /* !LISP_COMMAND_LOOP */ | |
| 410 | |
| 411 | |
| 412 /**********************************************************************/ | |
| 413 /* Alternate command-loop (largely in Lisp) */ | |
| 414 /**********************************************************************/ | |
| 415 | |
| 416 #ifdef LISP_COMMAND_LOOP | |
| 417 | |
| 418 static Lisp_Object | |
| 419 load1 (Lisp_Object name) | |
| 420 { | |
| 421 /* This function can GC */ | |
| 422 call4 (Qload, name, Qnil, Qt, Qnil); | |
| 423 return (Qnil); | |
| 424 } | |
| 425 | |
| 426 /* emergency backups for cold-load-stream use */ | |
| 427 static Lisp_Object | |
| 428 cold_load_command_error (Lisp_Object datum, Lisp_Object ignored) | |
| 429 { | |
| 430 /* This function can GC */ | |
| 431 check_quit (); /* make Vquit_flag accurate */ | |
| 432 Vquit_flag = Qnil; | |
| 433 | |
| 434 return default_error_handler (datum); | |
| 435 } | |
| 436 | |
| 437 static Lisp_Object | |
| 438 cold_load_command_loop (Lisp_Object dummy) | |
| 439 { | |
| 440 /* This function can GC */ | |
| 441 return (condition_case_1 (Qt, | |
| 442 command_loop_1, Qnil, | |
| 443 cold_load_command_error, Qnil)); | |
| 444 } | |
| 445 | |
| 2268 | 446 DOESNT_RETURN_TYPE (Lisp_Object) |
| 428 | 447 call_command_loop (Lisp_Object catch_errors) |
| 448 { | |
| 449 /* This function can GC */ | |
| 479 | 450 reset_this_command_keys (Vselected_console, 0); /* #### bleagh */ |
| 428 | 451 |
| 452 loop: | |
| 453 for (;;) | |
| 454 { | |
| 455 if (NILP (Vcommand_loop)) | |
| 456 break; | |
| 457 call1 (Vcommand_loop, catch_errors); | |
| 458 } | |
| 459 | |
| 460 /* This isn't a "correct" definition, but you're pretty hosed if | |
| 461 you broke "command-loop" anyway */ | |
| 462 /* #### not correct with Vselected_console */ | |
| 463 XCONSOLE (Vselected_console)->prefix_arg = Qnil; | |
| 464 if (NILP (catch_errors)) | |
| 465 Fcommand_loop_1 (); | |
| 466 else | |
| 2532 | 467 internal_catch (Qtop_level, cold_load_command_loop, Qnil, 0, 0, 0); |
| 428 | 468 goto loop; |
| 2268 | 469 RETURN_NOT_REACHED (Qnil); |
| 428 | 470 } |
| 471 | |
| 472 static Lisp_Object | |
| 473 initial_error_handler (Lisp_Object datum, Lisp_Object ignored) | |
| 474 { | |
| 475 /* This function can GC */ | |
| 476 Vcommand_loop = Qnil; | |
| 477 Fding (Qnil, Qnil, Qnil); | |
| 478 | |
| 479 if (CONSP (datum) && EQ (XCAR (datum), Qquit)) | |
| 480 /* Don't bother with the message */ | |
| 481 return (Qt); | |
| 482 | |
| 483 message ("Error in command-loop!!"); | |
| 484 Fset (intern ("last-error"), datum); /* #### Better/different name? */ | |
| 485 Fsit_for (make_int (2), Qnil); | |
| 486 cold_load_command_error (datum, Qnil); | |
| 487 return (Qt); | |
| 488 } | |
| 489 | |
| 490 DOESNT_RETURN | |
| 491 initial_command_loop (Lisp_Object load_me) | |
| 492 { | |
| 493 /* This function can GC */ | |
| 494 if (!NILP (load_me)) | |
| 495 { | |
| 496 if (!NILP (condition_case_1 (Qt, load1, load_me, | |
| 497 initial_error_handler, Qnil))) | |
| 498 Fkill_emacs (make_int (-1)); | |
| 499 } | |
| 500 | |
| 501 for (;;) | |
| 502 { | |
| 503 command_loop_level = 0; | |
| 504 MARK_MODELINE_CHANGED; | |
| 505 | |
| 506 condition_case_1 (Qt, | |
| 507 call_command_loop, Qtop_level, | |
| 508 initial_error_handler, Qnil); | |
| 509 } | |
| 510 } | |
| 511 | |
| 512 #endif /* LISP_COMMAND_LOOP */ | |
| 513 | |
| 514 | |
| 515 /**********************************************************************/ | |
| 516 /* Guts of command loop */ | |
| 517 /**********************************************************************/ | |
| 518 | |
| 2268 | 519 #ifdef LISP_COMMAND_LOOP |
| 428 | 520 static Lisp_Object |
| 2268 | 521 #else |
| 522 static DOESNT_RETURN_TYPE (Lisp_Object) | |
| 523 #endif | |
| 2286 | 524 command_loop_1 (Lisp_Object UNUSED (dummy)) |
| 428 | 525 { |
| 526 /* This function can GC */ | |
| 527 /* #### not correct with Vselected_console */ | |
| 528 XCONSOLE (Vselected_console)->prefix_arg = Qnil; | |
| 2268 | 529 Fcommand_loop_1 (); |
| 530 #ifdef LISP_COMMAND_LOOP | |
| 531 return Qnil; | |
| 532 #else | |
| 533 RETURN_NOT_REACHED (Qnil); | |
| 534 #endif | |
| 428 | 535 } |
| 536 | |
| 537 /* This is the actual command reading loop, sans error-handling | |
| 538 encapsulation. This is used for both the C and Lisp command | |
| 539 loops. Originally this function was written in Lisp when | |
| 540 the Lisp command loop was used, but it was too slow that way. | |
| 541 | |
| 542 Under the C command loop, this function will never return | |
| 543 (although someone might throw past it). Under the Lisp | |
| 544 command loop, this will return only when the user specifies | |
| 545 a new command loop by changing the command-loop variable. */ | |
| 546 | |
| 2268 | 547 #ifdef LISP_COMMAND_LOOP |
| 548 #define DEFUN_COMMAND_LOOP(a,b,c,d,e,f) DEFUN (a, b, c, d, e, f) | |
| 549 #else | |
| 550 #define DEFUN_COMMAND_LOOP(a,b,c,d,e,f) DEFUN_NORETURN (a, b, c, d, e, f) | |
| 551 #endif | |
| 552 | |
| 553 DEFUN_COMMAND_LOOP ("command-loop-1", Fcommand_loop_1, 0, 0, 0, /* | |
| 428 | 554 Invoke the internals of the canonical editor command loop. |
| 555 Don't call this unless you know what you're doing. | |
| 556 */ | |
| 557 ()) | |
| 558 { | |
| 559 /* This function can GC */ | |
| 560 Lisp_Object event = Fmake_event (Qnil, Qnil); | |
| 561 Lisp_Object old_loop = Qnil; | |
| 562 struct gcpro gcpro1, gcpro2; | |
| 563 int was_locked = in_single_console_state (); | |
| 564 GCPRO2 (event, old_loop); | |
| 565 | |
| 566 /* cancel_echoing (); */ | |
| 567 /* This magically makes single character keyboard macros work just | |
| 568 like the real thing. This is slightly bogus, but it's in here for | |
| 569 compatibility with Emacs 18. It's not even clear what the "right | |
| 570 thing" is. */ | |
| 434 | 571 if (!((STRINGP (Vexecuting_macro) || VECTORP (Vexecuting_macro)) |
| 572 && XINT (Flength (Vexecuting_macro)) == 1)) | |
| 428 | 573 Vlast_command = Qt; |
| 574 | |
| 575 #ifndef LISP_COMMAND_LOOP | |
| 576 while (1) | |
| 577 #else | |
| 578 old_loop = Vcommand_loop; | |
| 579 while (EQ (Vcommand_loop, old_loop)) | |
| 580 #endif /* LISP_COMMAND_LOOP */ | |
| 581 { | |
| 582 /* If focus_follows_mouse, make sure the frame with window manager | |
| 583 focus is selected. */ | |
| 584 if (focus_follows_mouse) | |
| 585 investigate_frame_change (); | |
| 434 | 586 |
| 428 | 587 /* Make sure the current window's buffer is selected. */ |
| 588 { | |
| 589 Lisp_Object selected_window = Fselected_window (Qnil); | |
| 590 | |
| 591 if (!NILP (selected_window) && | |
| 872 | 592 XWINDOW_XBUFFER (selected_window) != current_buffer) |
| 428 | 593 { |
| 872 | 594 set_buffer_internal (XWINDOW_XBUFFER (selected_window)); |
| 428 | 595 } |
| 596 } | |
| 597 | |
| 444 | 598 #if 0 /* What's wrong with going through ordinary procedure of quit? |
| 599 quitting here leaves overriding-terminal-local-map | |
| 600 when you type C-u C-u C-g. */ | |
| 428 | 601 /* If ^G was typed before we got here (that is, before emacs was |
| 602 idle and waiting for input) then we treat that as an interrupt. */ | |
| 603 QUIT; | |
| 444 | 604 #endif |
| 428 | 605 |
| 606 /* If minibuffer on and echo area in use, wait 2 sec and redraw | |
| 607 minibuffer. Treat a ^G here as a command, not an interrupt. | |
| 608 */ | |
| 609 if (minibuf_level > 0 && echo_area_active (selected_frame ())) | |
| 610 { | |
| 611 /* Bind dont_check_for_quit to 1 so that C-g gets read in | |
| 612 rather than quitting back to the minibuffer. */ | |
| 771 | 613 int count = begin_dont_check_for_quit (); |
| 1703 | 614 if (!NILP (Vminibuffer_echo_wait_function)) |
| 615 call0 (Vminibuffer_echo_wait_function); | |
| 616 else | |
| 617 Fsit_for (make_int (2), Qnil); | |
| 428 | 618 clear_echo_area (selected_frame (), Qnil, 0); |
| 853 | 619 Vquit_flag = Qnil; /* see begin_dont_check_for_quit() */ |
| 771 | 620 unbind_to (count); |
| 428 | 621 } |
| 622 | |
| 623 Fnext_event (event, Qnil); | |
| 624 Fdispatch_event (event); | |
| 625 | |
| 626 if (!was_locked) | |
| 627 any_console_state (); | |
| 1204 | 628 |
| 629 DO_NOTHING_DISABLING_NO_RETURN_WARNINGS; | |
| 428 | 630 } |
| 631 #ifdef LISP_COMMAND_LOOP | |
| 632 UNGCPRO; | |
| 633 return Qnil; | |
| 1204 | 634 #else |
| 635 RETURN_NOT_REACHED (Qnil); | |
| 428 | 636 #endif |
| 637 } | |
| 638 | |
| 639 | |
| 640 /**********************************************************************/ | |
| 641 /* Initialization */ | |
| 642 /**********************************************************************/ | |
| 643 | |
| 644 void | |
| 645 syms_of_cmdloop (void) | |
| 646 { | |
| 733 | 647 DEFSYMBOL (Qdisabled_command_hook); |
| 563 | 648 DEFSYMBOL (Qcommand_error); |
| 649 DEFSYMBOL (Qreally_early_error_handler); | |
| 650 DEFSYMBOL (Qtop_level); | |
| 651 DEFSYMBOL (Qerrors_deactivate_region); | |
| 428 | 652 |
| 653 #ifndef LISP_COMMAND_LOOP | |
| 654 DEFSUBR (Frecursive_edit); | |
| 655 #endif | |
| 656 DEFSUBR (Freally_early_error_handler); | |
| 657 DEFSUBR (Fcommand_loop_1); | |
| 658 } | |
| 659 | |
| 660 void | |
| 661 vars_of_cmdloop (void) | |
| 662 { | |
| 663 DEFVAR_INT ("command-loop-level", &command_loop_level /* | |
| 664 Number of recursive edits in progress. | |
| 665 */ ); | |
| 666 command_loop_level = 0; | |
| 667 | |
| 668 DEFVAR_LISP ("disabled-command-hook", &Vdisabled_command_hook /* | |
| 669 Value is called instead of any command that is disabled, | |
| 670 i.e. has a non-nil `disabled' property. | |
| 671 */ ); | |
| 672 Vdisabled_command_hook = intern ("disabled-command-hook"); | |
| 673 | |
| 674 DEFVAR_LISP ("leave-window-hook", &Vleave_window_hook /* | |
| 675 Not yet implemented. | |
| 676 */ ); | |
| 677 Vleave_window_hook = Qnil; | |
| 678 | |
| 679 DEFVAR_LISP ("enter-window-hook", &Venter_window_hook /* | |
| 680 Not yet implemented. | |
| 681 */ ); | |
| 682 Venter_window_hook = Qnil; | |
| 683 | |
| 1703 | 684 DEFVAR_LISP ("minibuffer-echo-wait-function", |
| 685 &Vminibuffer_echo_wait_function /* | |
| 686 The function called by command loop when minibuffer was active and | |
| 687 message was displayed (text appeared in \" *Echo Area*\" buffer). It | |
| 688 must wait after displaying message so that user can read it. If the | |
| 689 variable value is `nil', the equivalent of `(sit-for 2)' is run. | |
| 690 */ ); | |
| 691 Vminibuffer_echo_wait_function = Qnil; | |
| 692 | |
| 428 | 693 #ifndef LISP_COMMAND_LOOP |
| 694 DEFVAR_LISP ("top-level", &Vtop_level /* | |
| 695 Form to evaluate when Emacs starts up. | |
| 696 Useful to set before you dump a modified Emacs. | |
| 697 */ ); | |
| 698 Vtop_level = Qnil; | |
| 699 #else | |
| 700 DEFVAR_LISP ("command-loop", &Vcommand_loop /* | |
| 701 Function or one argument to call to read and process keyboard commands. | |
| 702 The passed argument specifies whether or not to handle errors. | |
| 703 */ ); | |
| 704 Vcommand_loop = Qnil; | |
| 705 #endif /* LISP_COMMAND_LOOP */ | |
| 706 } |