Mercurial > hg > xemacs-beta
annotate src/cmdloop.c @ 5402:308d34e9f07d
Changed bulk of GPLv2 or later files identified by script
| author | Mats Lidell <matsl@xemacs.org> |
|---|---|
| date | Thu, 14 Oct 2010 17:15:20 +0200 |
| parents | 838630c0734f |
| children | 56144c8593a8 |
| 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 | |
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
| 428 | 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 | |
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: Mule 2.0. Not synched with FSF. | |
| 21 This was renamed from keyboard.c. However, it only contains the | |
| 22 command-loop stuff from FSF's keyboard.c; all the rest is in | |
| 23 event*.c, console.c, or signal.c. */ | |
| 24 | |
| 25 /* #### This module purports to separate out the command-loop stuff | |
| 26 from event-stream.c, but it doesn't really. Perhaps this file | |
| 27 should just be merged into event-stream.c, given its shortness. */ | |
| 28 | |
| 29 #include <config.h> | |
| 30 #include "lisp.h" | |
| 31 | |
| 32 #include "buffer.h" | |
| 872 | 33 #include "console-impl.h" |
| 800 | 34 #include "device.h" |
| 428 | 35 #include "commands.h" |
| 36 #include "frame.h" | |
| 37 #include "events.h" | |
| 38 #include "window.h" | |
| 39 | |
| 872 | 40 #ifdef HAVE_MS_WINDOWS |
| 41 #include "console-msw.h" | |
| 42 #endif | |
| 43 | |
| 428 | 44 /* Current depth in recursive edits. */ |
| 458 | 45 Fixnum command_loop_level; |
| 428 | 46 |
| 47 #ifndef LISP_COMMAND_LOOP | |
| 48 /* Form to evaluate (if non-nil) when Emacs is started. */ | |
| 49 Lisp_Object Vtop_level; | |
| 50 #else | |
| 51 /* Function to call to evaluate to read and process events. */ | |
| 52 Lisp_Object Vcommand_loop; | |
| 53 #endif /* LISP_COMMAND_LOOP */ | |
| 54 | |
| 55 Lisp_Object Venter_window_hook, Vleave_window_hook; | |
| 56 | |
| 733 | 57 Lisp_Object Qdisabled_command_hook, Vdisabled_command_hook; |
| 58 | |
| 428 | 59 /* The error handler. */ |
| 60 Lisp_Object Qcommand_error; | |
| 61 | |
| 62 /* The emergency error handler, before we're ready. */ | |
| 63 Lisp_Object Qreally_early_error_handler; | |
| 64 | |
| 65 /* Variable defined in Lisp. */ | |
| 66 Lisp_Object Qerrors_deactivate_region; | |
| 67 | |
| 68 Lisp_Object Qtop_level; | |
| 1703 | 69 Lisp_Object Vminibuffer_echo_wait_function; |
| 428 | 70 |
| 2268 | 71 #ifdef LISP_COMMAND_LOOP |
| 428 | 72 static Lisp_Object command_loop_1 (Lisp_Object dummy); |
| 73 EXFUN (Fcommand_loop_1, 0); | |
| 2268 | 74 #else |
| 75 static DECLARE_DOESNT_RETURN_TYPE (Lisp_Object, | |
| 76 command_loop_1 (Lisp_Object dummy)); | |
| 77 EXFUN_NORETURN (Fcommand_loop_1, 0); | |
| 78 #endif | |
| 428 | 79 |
| 80 /* There are two possible command loops -- one written entirely in | |
| 81 C and one written mostly in Lisp, except stuff written in C for | |
| 82 speed. The advantage of the Lisp command loop is that the user | |
| 83 can specify their own command loop to use by changing the variable | |
| 84 `command-loop'. Its disadvantage is that it's slow. */ | |
| 85 | |
| 86 static Lisp_Object | |
| 87 default_error_handler (Lisp_Object data) | |
| 88 { | |
| 89 int speccount = specpdl_depth (); | |
| 90 | |
| 91 /* None of this is invoked, normally. This code is almost identical | |
| 92 to the `command-error' function, except `command-error' does cool | |
| 93 tricks with sounds. This function is a fallback, invoked if | |
| 94 command-error is unavailable. */ | |
| 95 | |
| 96 Fding (Qnil, Qnil, Qnil); | |
| 97 | |
| 98 if (!NILP (Fboundp (Qerrors_deactivate_region)) | |
| 99 && !NILP (Fsymbol_value (Qerrors_deactivate_region))) | |
| 100 zmacs_deactivate_region (); | |
| 101 Fdiscard_input (); | |
| 102 specbind (Qinhibit_quit, Qt); | |
| 103 Vstandard_output = Qt; | |
| 104 Vstandard_input = Qt; | |
| 105 Vexecuting_macro = Qnil; | |
| 106 Fset (intern ("last-error"), data); | |
| 107 clear_echo_area (selected_frame (), Qnil, 0); | |
| 108 Fdisplay_error (data, Qt); | |
| 109 check_quit (); /* make Vquit_flag accurate */ | |
| 110 Vquit_flag = Qnil; | |
| 771 | 111 return (unbind_to_1 (speccount, Qt)); |
| 428 | 112 } |
| 113 | |
| 2268 | 114 DEFUN_NORETURN ("really-early-error-handler", Freally_early_error_handler, |
| 115 1, 1, 0, /* | |
| 428 | 116 You should almost certainly not be using this. |
| 117 */ | |
| 118 (x)) | |
| 119 { | |
| 120 /* This is an error handler used when we're running temacs and when | |
| 121 we're in the early stages of XEmacs. No errors ought to be | |
| 122 occurring in those cases (or they ought to be trapped and | |
| 123 dealt with elsewhere), but if an error slips through, we need | |
| 124 to deal with it. We could write this function in Lisp (and it | |
| 125 used to be this way, at the beginning of loadup.el), but we do | |
| 126 it this way in case an error occurs before we get to loading | |
| 127 loadup.el. Note that there is also an `early-error-handler', | |
| 128 used in startup.el to catch more reasonable errors that | |
| 129 might occur during startup if the sysadmin or whoever fucked | |
| 130 up. This function is more conservative in what it does | |
| 131 and is used only as a last resort, indicating that the | |
| 132 programmer himself fucked up somewhere. */ | |
| 133 stderr_out ("*** Error in XEmacs initialization"); | |
| 134 Fprint (x, Qexternal_debugging_output); | |
| 135 stderr_out ("*** Backtrace\n"); | |
| 136 Fbacktrace (Qexternal_debugging_output, Qt); | |
| 137 stderr_out ("*** Killing XEmacs\n"); | |
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138 #ifdef DEBUG_XEMACS |
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139 /* When configured --with-debug, and debug-on-error is set, exit to the |
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140 debugger and abort. This will happen during loadup/dumping. There is |
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141 also code in signal_call_debugger() to do the same whenever running |
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142 noninteractively. That's intended for use debugging e.g. batch byte |
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143 compilation, AFTER dumping has already happened, where the XEMACSDEBUG |
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144 variable can be set to '(setq debug-on-error t)' to trigger the |
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145 behavior. |
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146 |
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147 Why do we need to duplicate the bomb-out check here? Well, |
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148 signal_call_debugger() doesn't want to bomb out unless it has an |
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149 uncaught error, and in this case, we've installed a |
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150 call-with-condition-case handler, and so signal_call_debugger() can't |
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151 bomb out before calling us. If we returned and let the error be |
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152 processed further, it *would* trigger the bomb-out-to-debugger |
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153 behavior, but in fact it never gets there because we do `kill-emacs'. |
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154 Therefore, we have to provide the bomb-to-debugger feature |
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155 ourselves. */ |
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156 if (!NILP (Vdebug_on_error)) |
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157 { |
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158 stderr_out ("XEmacs exiting to debugger.\n"); |
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159 Fforce_debugging_signal (Qt); |
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160 } |
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161 #endif |
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162 #if defined (HAVE_MS_WINDOWS) && defined (WIN32_NATIVE) |
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163 /* Don't do this under Cygwin, since we have output on stderr. */ |
| 771 | 164 Fmswindows_message_box (build_msg_string ("Initialization error"), |
| 442 | 165 Qnil, Qnil); |
| 166 #endif | |
| 2268 | 167 Fkill_emacs (make_int (-1)); |
| 168 RETURN_NOT_REACHED (Qnil); | |
| 428 | 169 } |
| 170 | |
| 171 | |
| 172 /**********************************************************************/ | |
| 173 /* Command-loop (in C) */ | |
| 174 /**********************************************************************/ | |
| 175 | |
| 176 #ifndef LISP_COMMAND_LOOP | |
| 177 | |
| 178 /* The guts of the command loop are in command_loop_1(). This function | |
| 179 doesn't catch errors, though -- that's the job of command_loop_2(), | |
| 180 which is a condition-case wrapper around command_loop_1(). | |
| 181 command_loop_1() never returns, but may get thrown out of. | |
| 182 | |
| 183 When an error occurs, cmd_error() is called, which usually | |
| 184 invokes the Lisp error handler in `command-error'; however, | |
| 185 a default error handler is provided if `command-error' is nil | |
| 186 (e.g. during startup). The purpose of the error handler is | |
| 187 simply to display the error message and do associated cleanup; | |
| 188 it does not need to throw anywhere. When the error handler | |
| 189 finishes, the condition-case in command_loop_2() will finish and | |
| 190 command_loop_2() will reinvoke command_loop_1(). | |
| 191 | |
| 192 command_loop_2() is invoked from three places: from | |
| 193 initial_command_loop() (called from main() at the end of | |
| 194 internal initialization), from the Lisp function `recursive-edit', | |
| 195 and from call_command_loop(). | |
| 196 | |
| 197 call_command_loop() is called when a macro is started and when the | |
| 198 minibuffer is entered; normal termination of the macro or | |
| 199 minibuffer causes a throw out of the recursive command loop. (To | |
| 3025 | 200 `execute-kbd-macro' for macros and `exit' for minibuffers. Note also |
| 428 | 201 that the low-level minibuffer-entering function, |
| 202 `read-minibuffer-internal', provides its own error handling and | |
| 203 does not need command_loop_2()'s error encapsulation; so it tells | |
| 204 call_command_loop() to invoke command_loop_1() directly.) | |
| 205 | |
| 206 Note that both read-minibuffer-internal and recursive-edit set | |
| 3025 | 207 up a catch for `exit'; this is why `abort-recursive-edit', which |
| 428 | 208 throws to this catch, exits out of either one. |
| 209 | |
| 210 initial_command_loop(), called from main(), sets up a catch | |
| 3025 | 211 for `top-level' when invoking command_loop_2(), allowing functions |
| 428 | 212 to throw all the way to the top level if they really need to. |
| 213 Before invoking command_loop_2(), initial_command_loop() calls | |
| 214 top_level_1(), which handles all of the startup stuff (creating | |
| 215 the initial frame, handling the command-line options, loading | |
| 216 the user's .emacs file, etc.). The function that actually does this | |
| 217 is in Lisp and is pointed to by the variable `top-level'; | |
| 218 normally this function is `normal-top-level'. top_level_1() is | |
| 219 just an error-handling wrapper similar to command_loop_2(). | |
| 3025 | 220 Note also that initial_command_loop() sets up a catch for `top-level' |
| 428 | 221 when invoking top_level_1(), just like when it invokes |
| 222 command_loop_2(). */ | |
| 223 | |
| 224 | |
| 225 static Lisp_Object | |
| 2286 | 226 cmd_error (Lisp_Object data, Lisp_Object UNUSED (dummy)) |
| 428 | 227 { |
| 228 /* This function can GC */ | |
| 229 check_quit (); /* make Vquit_flag accurate */ | |
| 230 Vquit_flag = Qnil; | |
| 231 | |
| 232 any_console_state (); | |
| 233 | |
| 234 if (!NILP (Ffboundp (Qcommand_error))) | |
| 235 return call1 (Qcommand_error, data); | |
| 236 | |
| 237 return default_error_handler (data); | |
| 238 } | |
| 239 | |
| 240 static Lisp_Object | |
| 2286 | 241 top_level_1 (Lisp_Object UNUSED (dummy)) |
| 428 | 242 { |
| 243 /* This function can GC */ | |
| 244 /* On entry to the outer level, run the startup file */ | |
| 245 if (!NILP (Vtop_level)) | |
| 246 condition_case_1 (Qerror, Feval, Vtop_level, cmd_error, Qnil); | |
| 247 #if 1 | |
| 248 else | |
| 249 { | |
| 250 message ("\ntemacs can only be run in -batch mode."); | |
| 251 noninteractive = 1; /* prevent things under kill-emacs from blowing up */ | |
| 252 Fkill_emacs (make_int (-1)); | |
| 253 } | |
| 254 #else | |
| 255 else if (purify_flag) | |
| 256 message ("Bare impure Emacs (standard Lisp code not loaded)"); | |
| 257 else | |
| 258 message ("Bare Emacs (standard Lisp code not loaded)"); | |
| 259 #endif | |
| 260 | |
| 261 return Qnil; | |
| 262 } | |
| 263 | |
| 264 /* Here we catch errors in execution of commands within the | |
| 265 editing loop, and reenter the editing loop. | |
| 266 When there is an error, cmd_error runs and the call | |
| 267 to condition_case_1() returns. */ | |
| 268 | |
| 269 /* Avoid confusing the compiler. A helper function for command_loop_2 */ | |
| 2268 | 270 static DECLARE_DOESNT_RETURN (command_loop_3 (void)); |
| 271 | |
| 428 | 272 static DOESNT_RETURN |
| 273 command_loop_3 (void) | |
| 274 { | |
| 275 /* | |
| 1268 | 276 * If we are inside of a menu callback we cannot reenter the command loop |
| 277 * because we will deadlock, as no input is allowed. | |
| 428 | 278 */ |
| 1268 | 279 if (in_modal_loop) |
| 280 invalid_operation ("Attempt to enter command loop inside menu callback", | |
| 281 Qunbound); | |
| 428 | 282 /* This function can GC */ |
| 283 for (;;) | |
| 284 { | |
| 285 condition_case_1 (Qerror, command_loop_1, Qnil, cmd_error, Qnil); | |
| 286 /* #### wrong with selected-console? */ | |
| 287 /* See command in initial_command_loop about why this value | |
| 288 is 0. */ | |
| 289 reset_this_command_keys (Vselected_console, 0); | |
| 290 } | |
| 291 } | |
| 292 | |
| 2268 | 293 static DECLARE_DOESNT_RETURN_TYPE (Lisp_Object, command_loop_2 (Lisp_Object)); |
| 294 | |
| 295 static DOESNT_RETURN_TYPE (Lisp_Object) | |
| 2286 | 296 command_loop_2 (Lisp_Object UNUSED (dummy)) |
| 428 | 297 { |
| 298 command_loop_3(); /* doesn't return */ | |
| 2268 | 299 RETURN_NOT_REACHED (Qnil); |
| 428 | 300 } |
| 301 | |
| 302 /* This is called from emacs.c when it's done with initialization. */ | |
| 303 | |
| 304 DOESNT_RETURN | |
| 305 initial_command_loop (Lisp_Object load_me) | |
| 306 { | |
| 307 /* This function can GC */ | |
| 308 if (!NILP (load_me)) | |
| 309 Vtop_level = list2 (Qload, load_me); | |
| 310 | |
| 311 /* First deal with startup and command-line arguments. A throw | |
| 3025 | 312 to `top-level' gets us back here directly (does this ever happen?). |
| 428 | 313 Otherwise, this function will return normally when all command- |
| 314 line arguments have been processed, the user's initialization | |
| 315 file has been read in, and the first frame has been created. */ | |
| 2532 | 316 internal_catch (Qtop_level, top_level_1, Qnil, 0, 0, 0); |
| 428 | 317 |
| 318 /* If an error occurred during startup and the initial console | |
| 319 wasn't created, then die now (the error was already printed out | |
| 320 on the terminal device). */ | |
| 321 if (!noninteractive && | |
| 322 (!CONSOLEP (Vselected_console) || | |
| 323 CONSOLE_STREAM_P (XCONSOLE (Vselected_console)))) | |
| 324 Fkill_emacs (make_int (-1)); | |
| 325 | |
| 326 /* End of -batch run causes exit here. */ | |
| 327 if (noninteractive) | |
| 328 Fkill_emacs (Qt); | |
| 329 | |
| 330 for (;;) | |
| 331 { | |
| 332 command_loop_level = 0; | |
| 333 MARK_MODELINE_CHANGED; | |
| 334 /* Now invoke the command loop. It never returns; however, a | |
| 3025 | 335 throw to `top-level' will place us at the end of this loop. */ |
| 2532 | 336 internal_catch (Qtop_level, command_loop_2, Qnil, 0, 0, 0); |
| 428 | 337 /* #### wrong with selected-console? */ |
| 338 /* We don't actually call clear_echo_area() here, partially | |
| 339 at least because that runs Lisp code and it may be unsafe | |
| 340 to do so -- we are outside of the normal catches for | |
| 341 errors and such. */ | |
| 342 reset_this_command_keys (Vselected_console, 0); | |
| 343 } | |
| 344 } | |
| 345 | |
| 346 /* This function is invoked when a macro or minibuffer starts up. | |
| 347 Normal termination of the macro or minibuffer causes a throw past us. | |
| 348 See the comment above. | |
| 349 | |
| 350 Note that this function never returns (but may be thrown out of). */ | |
| 351 | |
| 2268 | 352 DOESNT_RETURN_TYPE (Lisp_Object) |
| 428 | 353 call_command_loop (Lisp_Object catch_errors) |
| 354 { | |
| 355 /* This function can GC */ | |
| 356 if (NILP (catch_errors)) | |
| 2268 | 357 command_loop_1 (Qnil); |
| 428 | 358 else |
| 2268 | 359 command_loop_2 (Qnil); |
| 360 RETURN_NOT_REACHED (Qnil); | |
| 428 | 361 } |
| 362 | |
| 363 static Lisp_Object | |
| 364 recursive_edit_unwind (Lisp_Object buffer) | |
| 365 { | |
| 366 if (!NILP (buffer)) | |
| 367 Fset_buffer (buffer); | |
| 368 | |
| 369 command_loop_level--; | |
| 370 MARK_MODELINE_CHANGED; | |
| 371 | |
| 372 return Qnil; | |
| 373 } | |
| 374 | |
| 375 DEFUN ("recursive-edit", Frecursive_edit, 0, 0, "", /* | |
| 376 Invoke the editor command loop recursively. | |
| 377 To get out of the recursive edit, a command can do `(throw 'exit nil)'; | |
| 378 that tells this function to return. | |
| 379 Alternately, `(throw 'exit t)' makes this function signal an error. | |
| 380 */ | |
| 381 ()) | |
| 382 { | |
| 383 /* This function can GC */ | |
| 384 Lisp_Object val; | |
| 385 int speccount = specpdl_depth (); | |
| 386 | |
| 387 command_loop_level++; | |
| 388 MARK_MODELINE_CHANGED; | |
| 389 | |
| 390 record_unwind_protect (recursive_edit_unwind, | |
| 872 | 391 current_buffer |
| 392 != XWINDOW_XBUFFER (Fselected_window (Qnil)) | |
| 428 | 393 ? Fcurrent_buffer () |
| 872 | 394 : Qnil); |
| 428 | 395 |
| 396 specbind (Qstandard_output, Qt); | |
| 397 specbind (Qstandard_input, Qt); | |
| 398 | |
| 2532 | 399 val = internal_catch (Qexit, command_loop_2, Qnil, 0, 0, 0); |
| 428 | 400 |
| 401 if (EQ (val, Qt)) | |
| 402 /* Turn abort-recursive-edit into a quit. */ | |
| 403 Fsignal (Qquit, Qnil); | |
| 404 | |
| 771 | 405 return unbind_to (speccount); |
| 428 | 406 } |
| 407 | |
| 408 #endif /* !LISP_COMMAND_LOOP */ | |
| 409 | |
| 410 | |
| 411 /**********************************************************************/ | |
| 412 /* Alternate command-loop (largely in Lisp) */ | |
| 413 /**********************************************************************/ | |
| 414 | |
| 415 #ifdef LISP_COMMAND_LOOP | |
| 416 | |
| 417 static Lisp_Object | |
| 418 load1 (Lisp_Object name) | |
| 419 { | |
| 420 /* This function can GC */ | |
| 421 call4 (Qload, name, Qnil, Qt, Qnil); | |
| 422 return (Qnil); | |
| 423 } | |
| 424 | |
| 425 /* emergency backups for cold-load-stream use */ | |
| 426 static Lisp_Object | |
| 427 cold_load_command_error (Lisp_Object datum, Lisp_Object ignored) | |
| 428 { | |
| 429 /* This function can GC */ | |
| 430 check_quit (); /* make Vquit_flag accurate */ | |
| 431 Vquit_flag = Qnil; | |
| 432 | |
| 433 return default_error_handler (datum); | |
| 434 } | |
| 435 | |
| 436 static Lisp_Object | |
| 437 cold_load_command_loop (Lisp_Object dummy) | |
| 438 { | |
| 439 /* This function can GC */ | |
| 440 return (condition_case_1 (Qt, | |
| 441 command_loop_1, Qnil, | |
| 442 cold_load_command_error, Qnil)); | |
| 443 } | |
| 444 | |
| 2268 | 445 DOESNT_RETURN_TYPE (Lisp_Object) |
| 428 | 446 call_command_loop (Lisp_Object catch_errors) |
| 447 { | |
| 448 /* This function can GC */ | |
| 479 | 449 reset_this_command_keys (Vselected_console, 0); /* #### bleagh */ |
| 428 | 450 |
| 451 loop: | |
| 452 for (;;) | |
| 453 { | |
| 454 if (NILP (Vcommand_loop)) | |
| 455 break; | |
| 456 call1 (Vcommand_loop, catch_errors); | |
| 457 } | |
| 458 | |
| 459 /* This isn't a "correct" definition, but you're pretty hosed if | |
| 460 you broke "command-loop" anyway */ | |
| 461 /* #### not correct with Vselected_console */ | |
| 462 XCONSOLE (Vselected_console)->prefix_arg = Qnil; | |
| 463 if (NILP (catch_errors)) | |
| 464 Fcommand_loop_1 (); | |
| 465 else | |
| 2532 | 466 internal_catch (Qtop_level, cold_load_command_loop, Qnil, 0, 0, 0); |
| 428 | 467 goto loop; |
| 2268 | 468 RETURN_NOT_REACHED (Qnil); |
| 428 | 469 } |
| 470 | |
| 471 static Lisp_Object | |
| 472 initial_error_handler (Lisp_Object datum, Lisp_Object ignored) | |
| 473 { | |
| 474 /* This function can GC */ | |
| 475 Vcommand_loop = Qnil; | |
| 476 Fding (Qnil, Qnil, Qnil); | |
| 477 | |
| 478 if (CONSP (datum) && EQ (XCAR (datum), Qquit)) | |
| 479 /* Don't bother with the message */ | |
| 480 return (Qt); | |
| 481 | |
| 482 message ("Error in command-loop!!"); | |
| 483 Fset (intern ("last-error"), datum); /* #### Better/different name? */ | |
| 484 Fsit_for (make_int (2), Qnil); | |
| 485 cold_load_command_error (datum, Qnil); | |
| 486 return (Qt); | |
| 487 } | |
| 488 | |
| 489 DOESNT_RETURN | |
| 490 initial_command_loop (Lisp_Object load_me) | |
| 491 { | |
| 492 /* This function can GC */ | |
| 493 if (!NILP (load_me)) | |
| 494 { | |
| 495 if (!NILP (condition_case_1 (Qt, load1, load_me, | |
| 496 initial_error_handler, Qnil))) | |
| 497 Fkill_emacs (make_int (-1)); | |
| 498 } | |
| 499 | |
| 500 for (;;) | |
| 501 { | |
| 502 command_loop_level = 0; | |
| 503 MARK_MODELINE_CHANGED; | |
| 504 | |
| 505 condition_case_1 (Qt, | |
| 506 call_command_loop, Qtop_level, | |
| 507 initial_error_handler, Qnil); | |
| 508 } | |
| 509 } | |
| 510 | |
| 511 #endif /* LISP_COMMAND_LOOP */ | |
| 512 | |
| 513 | |
| 514 /**********************************************************************/ | |
| 515 /* Guts of command loop */ | |
| 516 /**********************************************************************/ | |
| 517 | |
| 2268 | 518 #ifdef LISP_COMMAND_LOOP |
| 428 | 519 static Lisp_Object |
| 2268 | 520 #else |
| 521 static DOESNT_RETURN_TYPE (Lisp_Object) | |
| 522 #endif | |
| 2286 | 523 command_loop_1 (Lisp_Object UNUSED (dummy)) |
| 428 | 524 { |
| 525 /* This function can GC */ | |
| 526 /* #### not correct with Vselected_console */ | |
| 527 XCONSOLE (Vselected_console)->prefix_arg = Qnil; | |
| 2268 | 528 Fcommand_loop_1 (); |
| 529 #ifdef LISP_COMMAND_LOOP | |
| 530 return Qnil; | |
| 531 #else | |
| 532 RETURN_NOT_REACHED (Qnil); | |
| 533 #endif | |
| 428 | 534 } |
| 535 | |
| 536 /* This is the actual command reading loop, sans error-handling | |
| 537 encapsulation. This is used for both the C and Lisp command | |
| 538 loops. Originally this function was written in Lisp when | |
| 539 the Lisp command loop was used, but it was too slow that way. | |
| 540 | |
| 541 Under the C command loop, this function will never return | |
| 542 (although someone might throw past it). Under the Lisp | |
| 543 command loop, this will return only when the user specifies | |
| 544 a new command loop by changing the command-loop variable. */ | |
| 545 | |
| 2268 | 546 #ifdef LISP_COMMAND_LOOP |
| 547 #define DEFUN_COMMAND_LOOP(a,b,c,d,e,f) DEFUN (a, b, c, d, e, f) | |
| 548 #else | |
| 549 #define DEFUN_COMMAND_LOOP(a,b,c,d,e,f) DEFUN_NORETURN (a, b, c, d, e, f) | |
| 550 #endif | |
| 551 | |
| 552 DEFUN_COMMAND_LOOP ("command-loop-1", Fcommand_loop_1, 0, 0, 0, /* | |
| 428 | 553 Invoke the internals of the canonical editor command loop. |
| 554 Don't call this unless you know what you're doing. | |
| 555 */ | |
| 556 ()) | |
| 557 { | |
| 558 /* This function can GC */ | |
| 559 Lisp_Object event = Fmake_event (Qnil, Qnil); | |
| 560 Lisp_Object old_loop = Qnil; | |
| 561 struct gcpro gcpro1, gcpro2; | |
| 562 int was_locked = in_single_console_state (); | |
| 563 GCPRO2 (event, old_loop); | |
| 564 | |
| 565 /* cancel_echoing (); */ | |
| 566 /* This magically makes single character keyboard macros work just | |
| 567 like the real thing. This is slightly bogus, but it's in here for | |
| 568 compatibility with Emacs 18. It's not even clear what the "right | |
| 569 thing" is. */ | |
| 434 | 570 if (!((STRINGP (Vexecuting_macro) || VECTORP (Vexecuting_macro)) |
| 571 && XINT (Flength (Vexecuting_macro)) == 1)) | |
| 428 | 572 Vlast_command = Qt; |
| 573 | |
| 574 #ifndef LISP_COMMAND_LOOP | |
| 575 while (1) | |
| 576 #else | |
| 577 old_loop = Vcommand_loop; | |
| 578 while (EQ (Vcommand_loop, old_loop)) | |
| 579 #endif /* LISP_COMMAND_LOOP */ | |
| 580 { | |
| 581 /* If focus_follows_mouse, make sure the frame with window manager | |
| 582 focus is selected. */ | |
| 583 if (focus_follows_mouse) | |
| 584 investigate_frame_change (); | |
| 434 | 585 |
| 428 | 586 /* Make sure the current window's buffer is selected. */ |
| 587 { | |
| 588 Lisp_Object selected_window = Fselected_window (Qnil); | |
| 589 | |
| 590 if (!NILP (selected_window) && | |
| 872 | 591 XWINDOW_XBUFFER (selected_window) != current_buffer) |
| 428 | 592 { |
| 872 | 593 set_buffer_internal (XWINDOW_XBUFFER (selected_window)); |
| 428 | 594 } |
| 595 } | |
| 596 | |
| 444 | 597 #if 0 /* What's wrong with going through ordinary procedure of quit? |
| 598 quitting here leaves overriding-terminal-local-map | |
| 599 when you type C-u C-u C-g. */ | |
| 428 | 600 /* If ^G was typed before we got here (that is, before emacs was |
| 601 idle and waiting for input) then we treat that as an interrupt. */ | |
| 602 QUIT; | |
| 444 | 603 #endif |
| 428 | 604 |
| 605 /* If minibuffer on and echo area in use, wait 2 sec and redraw | |
| 606 minibuffer. Treat a ^G here as a command, not an interrupt. | |
| 607 */ | |
| 608 if (minibuf_level > 0 && echo_area_active (selected_frame ())) | |
| 609 { | |
| 610 /* Bind dont_check_for_quit to 1 so that C-g gets read in | |
| 611 rather than quitting back to the minibuffer. */ | |
| 771 | 612 int count = begin_dont_check_for_quit (); |
| 1703 | 613 if (!NILP (Vminibuffer_echo_wait_function)) |
| 614 call0 (Vminibuffer_echo_wait_function); | |
| 615 else | |
| 616 Fsit_for (make_int (2), Qnil); | |
| 428 | 617 clear_echo_area (selected_frame (), Qnil, 0); |
| 853 | 618 Vquit_flag = Qnil; /* see begin_dont_check_for_quit() */ |
| 771 | 619 unbind_to (count); |
| 428 | 620 } |
| 621 | |
| 622 Fnext_event (event, Qnil); | |
| 623 Fdispatch_event (event); | |
| 624 | |
| 625 if (!was_locked) | |
| 626 any_console_state (); | |
| 1204 | 627 |
| 628 DO_NOTHING_DISABLING_NO_RETURN_WARNINGS; | |
| 428 | 629 } |
| 630 #ifdef LISP_COMMAND_LOOP | |
| 631 UNGCPRO; | |
| 632 return Qnil; | |
| 1204 | 633 #else |
| 634 RETURN_NOT_REACHED (Qnil); | |
| 428 | 635 #endif |
| 636 } | |
| 637 | |
| 638 | |
| 639 /**********************************************************************/ | |
| 640 /* Initialization */ | |
| 641 /**********************************************************************/ | |
| 642 | |
| 643 void | |
| 644 syms_of_cmdloop (void) | |
| 645 { | |
| 733 | 646 DEFSYMBOL (Qdisabled_command_hook); |
| 563 | 647 DEFSYMBOL (Qcommand_error); |
| 648 DEFSYMBOL (Qreally_early_error_handler); | |
| 649 DEFSYMBOL (Qtop_level); | |
| 650 DEFSYMBOL (Qerrors_deactivate_region); | |
| 428 | 651 |
| 652 #ifndef LISP_COMMAND_LOOP | |
| 653 DEFSUBR (Frecursive_edit); | |
| 654 #endif | |
| 655 DEFSUBR (Freally_early_error_handler); | |
| 656 DEFSUBR (Fcommand_loop_1); | |
| 657 } | |
| 658 | |
| 659 void | |
| 660 vars_of_cmdloop (void) | |
| 661 { | |
| 662 DEFVAR_INT ("command-loop-level", &command_loop_level /* | |
| 663 Number of recursive edits in progress. | |
| 664 */ ); | |
| 665 command_loop_level = 0; | |
| 666 | |
| 667 DEFVAR_LISP ("disabled-command-hook", &Vdisabled_command_hook /* | |
| 668 Value is called instead of any command that is disabled, | |
| 669 i.e. has a non-nil `disabled' property. | |
| 670 */ ); | |
| 671 Vdisabled_command_hook = intern ("disabled-command-hook"); | |
| 672 | |
| 673 DEFVAR_LISP ("leave-window-hook", &Vleave_window_hook /* | |
| 674 Not yet implemented. | |
| 675 */ ); | |
| 676 Vleave_window_hook = Qnil; | |
| 677 | |
| 678 DEFVAR_LISP ("enter-window-hook", &Venter_window_hook /* | |
| 679 Not yet implemented. | |
| 680 */ ); | |
| 681 Venter_window_hook = Qnil; | |
| 682 | |
| 1703 | 683 DEFVAR_LISP ("minibuffer-echo-wait-function", |
| 684 &Vminibuffer_echo_wait_function /* | |
| 685 The function called by command loop when minibuffer was active and | |
| 686 message was displayed (text appeared in \" *Echo Area*\" buffer). It | |
| 687 must wait after displaying message so that user can read it. If the | |
| 688 variable value is `nil', the equivalent of `(sit-for 2)' is run. | |
| 689 */ ); | |
| 690 Vminibuffer_echo_wait_function = Qnil; | |
| 691 | |
| 428 | 692 #ifndef LISP_COMMAND_LOOP |
| 693 DEFVAR_LISP ("top-level", &Vtop_level /* | |
| 694 Form to evaluate when Emacs starts up. | |
| 695 Useful to set before you dump a modified Emacs. | |
| 696 */ ); | |
| 697 Vtop_level = Qnil; | |
| 698 #else | |
| 699 DEFVAR_LISP ("command-loop", &Vcommand_loop /* | |
| 700 Function or one argument to call to read and process keyboard commands. | |
| 701 The passed argument specifies whether or not to handle errors. | |
| 702 */ ); | |
| 703 Vcommand_loop = Qnil; | |
| 704 #endif /* LISP_COMMAND_LOOP */ | |
| 705 } |