|
428
|
1 /* Editor command loop.
|
|
|
2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
|
|
771
|
3 Copyright (C) 1995, 1996, 2001 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
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|
|
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
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|
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31 #include <config.h>
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|
|
32 #include "lisp.h"
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33
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|
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34 #include "buffer.h"
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|
|
35 #include "commands.h"
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|
36 #include "frame.h"
|
|
|
37 #include "events.h"
|
|
|
38 #include "window.h"
|
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39
|
|
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40 /* Current depth in recursive edits. */
|
|
458
|
41 Fixnum command_loop_level;
|
|
428
|
42
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|
|
43 #ifndef LISP_COMMAND_LOOP
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|
|
44 /* Form to evaluate (if non-nil) when Emacs is started. */
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|
45 Lisp_Object Vtop_level;
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|
|
46 #else
|
|
|
47 /* Function to call to evaluate to read and process events. */
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|
|
48 Lisp_Object Vcommand_loop;
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|
|
49 #endif /* LISP_COMMAND_LOOP */
|
|
|
50
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|
|
51 Lisp_Object Venter_window_hook, Vleave_window_hook;
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|
|
52
|
|
733
|
53 Lisp_Object Qdisabled_command_hook, Vdisabled_command_hook;
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|
|
54
|
|
428
|
55 /* The error handler. */
|
|
|
56 Lisp_Object Qcommand_error;
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|
57
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|
|
58 /* The emergency error handler, before we're ready. */
|
|
|
59 Lisp_Object Qreally_early_error_handler;
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60
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|
|
61 /* Variable defined in Lisp. */
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|
|
62 Lisp_Object Qerrors_deactivate_region;
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|
63
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|
|
64 Lisp_Object Qtop_level;
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|
65
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|
|
66 static Lisp_Object command_loop_1 (Lisp_Object dummy);
|
|
|
67 EXFUN (Fcommand_loop_1, 0);
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|
|
68
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|
|
69 /* There are two possible command loops -- one written entirely in
|
|
|
70 C and one written mostly in Lisp, except stuff written in C for
|
|
|
71 speed. The advantage of the Lisp command loop is that the user
|
|
|
72 can specify their own command loop to use by changing the variable
|
|
|
73 `command-loop'. Its disadvantage is that it's slow. */
|
|
|
74
|
|
|
75 static Lisp_Object
|
|
|
76 default_error_handler (Lisp_Object data)
|
|
|
77 {
|
|
|
78 int speccount = specpdl_depth ();
|
|
|
79
|
|
|
80 /* None of this is invoked, normally. This code is almost identical
|
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|
81 to the `command-error' function, except `command-error' does cool
|
|
|
82 tricks with sounds. This function is a fallback, invoked if
|
|
|
83 command-error is unavailable. */
|
|
|
84
|
|
|
85 Fding (Qnil, Qnil, Qnil);
|
|
|
86
|
|
|
87 if (!NILP (Fboundp (Qerrors_deactivate_region))
|
|
|
88 && !NILP (Fsymbol_value (Qerrors_deactivate_region)))
|
|
|
89 zmacs_deactivate_region ();
|
|
|
90 Fdiscard_input ();
|
|
|
91 specbind (Qinhibit_quit, Qt);
|
|
|
92 Vstandard_output = Qt;
|
|
|
93 Vstandard_input = Qt;
|
|
|
94 Vexecuting_macro = Qnil;
|
|
|
95 Fset (intern ("last-error"), data);
|
|
|
96 clear_echo_area (selected_frame (), Qnil, 0);
|
|
|
97 Fdisplay_error (data, Qt);
|
|
|
98 check_quit (); /* make Vquit_flag accurate */
|
|
|
99 Vquit_flag = Qnil;
|
|
771
|
100 return (unbind_to_1 (speccount, Qt));
|
|
428
|
101 }
|
|
|
102
|
|
|
103 DEFUN ("really-early-error-handler", Freally_early_error_handler, 1, 1, 0, /*
|
|
|
104 You should almost certainly not be using this.
|
|
|
105 */
|
|
|
106 (x))
|
|
|
107 {
|
|
|
108 /* This is an error handler used when we're running temacs and when
|
|
|
109 we're in the early stages of XEmacs. No errors ought to be
|
|
|
110 occurring in those cases (or they ought to be trapped and
|
|
|
111 dealt with elsewhere), but if an error slips through, we need
|
|
|
112 to deal with it. We could write this function in Lisp (and it
|
|
|
113 used to be this way, at the beginning of loadup.el), but we do
|
|
|
114 it this way in case an error occurs before we get to loading
|
|
|
115 loadup.el. Note that there is also an `early-error-handler',
|
|
|
116 used in startup.el to catch more reasonable errors that
|
|
|
117 might occur during startup if the sysadmin or whoever fucked
|
|
|
118 up. This function is more conservative in what it does
|
|
|
119 and is used only as a last resort, indicating that the
|
|
|
120 programmer himself fucked up somewhere. */
|
|
|
121 stderr_out ("*** Error in XEmacs initialization");
|
|
|
122 Fprint (x, Qexternal_debugging_output);
|
|
|
123 stderr_out ("*** Backtrace\n");
|
|
|
124 Fbacktrace (Qexternal_debugging_output, Qt);
|
|
|
125 stderr_out ("*** Killing XEmacs\n");
|
|
442
|
126 #ifdef HAVE_MS_WINDOWS
|
|
771
|
127 Fmswindows_message_box (build_msg_string ("Initialization error"),
|
|
442
|
128 Qnil, Qnil);
|
|
|
129 #endif
|
|
428
|
130 return Fkill_emacs (make_int (-1));
|
|
|
131 }
|
|
|
132
|
|
|
133
|
|
|
134 /**********************************************************************/
|
|
|
135 /* Command-loop (in C) */
|
|
|
136 /**********************************************************************/
|
|
|
137
|
|
|
138 #ifndef LISP_COMMAND_LOOP
|
|
|
139
|
|
|
140 /* The guts of the command loop are in command_loop_1(). This function
|
|
|
141 doesn't catch errors, though -- that's the job of command_loop_2(),
|
|
|
142 which is a condition-case wrapper around command_loop_1().
|
|
|
143 command_loop_1() never returns, but may get thrown out of.
|
|
|
144
|
|
|
145 When an error occurs, cmd_error() is called, which usually
|
|
|
146 invokes the Lisp error handler in `command-error'; however,
|
|
|
147 a default error handler is provided if `command-error' is nil
|
|
|
148 (e.g. during startup). The purpose of the error handler is
|
|
|
149 simply to display the error message and do associated cleanup;
|
|
|
150 it does not need to throw anywhere. When the error handler
|
|
|
151 finishes, the condition-case in command_loop_2() will finish and
|
|
|
152 command_loop_2() will reinvoke command_loop_1().
|
|
|
153
|
|
|
154 command_loop_2() is invoked from three places: from
|
|
|
155 initial_command_loop() (called from main() at the end of
|
|
|
156 internal initialization), from the Lisp function `recursive-edit',
|
|
|
157 and from call_command_loop().
|
|
|
158
|
|
|
159 call_command_loop() is called when a macro is started and when the
|
|
|
160 minibuffer is entered; normal termination of the macro or
|
|
|
161 minibuffer causes a throw out of the recursive command loop. (To
|
|
|
162 'execute-kbd-macro for macros and 'exit for minibuffers. Note also
|
|
|
163 that the low-level minibuffer-entering function,
|
|
|
164 `read-minibuffer-internal', provides its own error handling and
|
|
|
165 does not need command_loop_2()'s error encapsulation; so it tells
|
|
|
166 call_command_loop() to invoke command_loop_1() directly.)
|
|
|
167
|
|
|
168 Note that both read-minibuffer-internal and recursive-edit set
|
|
|
169 up a catch for 'exit; this is why `abort-recursive-edit', which
|
|
|
170 throws to this catch, exits out of either one.
|
|
|
171
|
|
|
172 initial_command_loop(), called from main(), sets up a catch
|
|
|
173 for 'top-level when invoking command_loop_2(), allowing functions
|
|
|
174 to throw all the way to the top level if they really need to.
|
|
|
175 Before invoking command_loop_2(), initial_command_loop() calls
|
|
|
176 top_level_1(), which handles all of the startup stuff (creating
|
|
|
177 the initial frame, handling the command-line options, loading
|
|
|
178 the user's .emacs file, etc.). The function that actually does this
|
|
|
179 is in Lisp and is pointed to by the variable `top-level';
|
|
|
180 normally this function is `normal-top-level'. top_level_1() is
|
|
|
181 just an error-handling wrapper similar to command_loop_2().
|
|
|
182 Note also that initial_command_loop() sets up a catch for 'top-level
|
|
|
183 when invoking top_level_1(), just like when it invokes
|
|
|
184 command_loop_2(). */
|
|
|
185
|
|
|
186
|
|
|
187 static Lisp_Object
|
|
|
188 cmd_error (Lisp_Object data, Lisp_Object dummy)
|
|
|
189 {
|
|
|
190 /* This function can GC */
|
|
|
191 check_quit (); /* make Vquit_flag accurate */
|
|
|
192 Vquit_flag = Qnil;
|
|
|
193
|
|
|
194 any_console_state ();
|
|
|
195
|
|
|
196 if (!NILP (Ffboundp (Qcommand_error)))
|
|
|
197 return call1 (Qcommand_error, data);
|
|
|
198
|
|
|
199 return default_error_handler (data);
|
|
|
200 }
|
|
|
201
|
|
|
202 static Lisp_Object
|
|
|
203 top_level_1 (Lisp_Object dummy)
|
|
|
204 {
|
|
|
205 /* This function can GC */
|
|
|
206 /* On entry to the outer level, run the startup file */
|
|
|
207 if (!NILP (Vtop_level))
|
|
|
208 condition_case_1 (Qerror, Feval, Vtop_level, cmd_error, Qnil);
|
|
|
209 #if 1
|
|
|
210 else
|
|
|
211 {
|
|
|
212 message ("\ntemacs can only be run in -batch mode.");
|
|
|
213 noninteractive = 1; /* prevent things under kill-emacs from blowing up */
|
|
|
214 Fkill_emacs (make_int (-1));
|
|
|
215 }
|
|
|
216 #else
|
|
|
217 else if (purify_flag)
|
|
|
218 message ("Bare impure Emacs (standard Lisp code not loaded)");
|
|
|
219 else
|
|
|
220 message ("Bare Emacs (standard Lisp code not loaded)");
|
|
|
221 #endif
|
|
|
222
|
|
|
223 return Qnil;
|
|
|
224 }
|
|
|
225
|
|
|
226 /* Here we catch errors in execution of commands within the
|
|
|
227 editing loop, and reenter the editing loop.
|
|
|
228 When there is an error, cmd_error runs and the call
|
|
|
229 to condition_case_1() returns. */
|
|
|
230
|
|
|
231 /* Avoid confusing the compiler. A helper function for command_loop_2 */
|
|
|
232 static DOESNT_RETURN
|
|
|
233 command_loop_3 (void)
|
|
|
234 {
|
|
|
235 #ifdef LWLIB_MENUBARS_LUCID
|
|
|
236 extern int in_menu_callback; /* defined in menubar-x.c */
|
|
|
237 #endif /* LWLIB_MENUBARS_LUCID */
|
|
|
238
|
|
|
239 #ifdef LWLIB_MENUBARS_LUCID
|
|
|
240 /*
|
|
|
241 * #### Fix the menu code so this isn't necessary.
|
|
|
242 *
|
|
|
243 * We cannot allow the lwmenu code to be reentered, because the
|
|
|
244 * code is not written to be reentrant and will crash. Therefore
|
|
|
245 * paths from the menu callbacks back into the menu code have to
|
|
|
246 * be blocked. Fnext_event is the normal path into the menu code,
|
|
|
247 * but waiting to signal an error there is too late in case where
|
|
|
248 * a new command loop has been started. The error will be caught
|
|
|
249 * and Fnext_event will be called again, looping forever. So we
|
|
|
250 * signal an error here to avoid the loop.
|
|
|
251 */
|
|
|
252 if (in_menu_callback)
|
|
563
|
253 invalid_operation ("Attempt to enter command_loop_3 inside menu callback", Qunbound);
|
|
428
|
254 #endif /* LWLIB_MENUBARS_LUCID */
|
|
|
255 /* This function can GC */
|
|
|
256 for (;;)
|
|
|
257 {
|
|
|
258 condition_case_1 (Qerror, command_loop_1, Qnil, cmd_error, Qnil);
|
|
|
259 /* #### wrong with selected-console? */
|
|
|
260 /* See command in initial_command_loop about why this value
|
|
|
261 is 0. */
|
|
|
262 reset_this_command_keys (Vselected_console, 0);
|
|
|
263 }
|
|
|
264 }
|
|
|
265
|
|
|
266 static Lisp_Object
|
|
|
267 command_loop_2 (Lisp_Object dummy)
|
|
|
268 {
|
|
|
269 command_loop_3(); /* doesn't return */
|
|
|
270 return Qnil;
|
|
|
271 }
|
|
|
272
|
|
|
273 /* This is called from emacs.c when it's done with initialization. */
|
|
|
274
|
|
|
275 DOESNT_RETURN
|
|
|
276 initial_command_loop (Lisp_Object load_me)
|
|
|
277 {
|
|
|
278 /* This function can GC */
|
|
|
279 if (!NILP (load_me))
|
|
|
280 Vtop_level = list2 (Qload, load_me);
|
|
|
281
|
|
|
282 /* First deal with startup and command-line arguments. A throw
|
|
|
283 to 'top-level gets us back here directly (does this ever happen?).
|
|
|
284 Otherwise, this function will return normally when all command-
|
|
|
285 line arguments have been processed, the user's initialization
|
|
|
286 file has been read in, and the first frame has been created. */
|
|
|
287 internal_catch (Qtop_level, top_level_1, Qnil, 0);
|
|
|
288
|
|
|
289 /* If an error occurred during startup and the initial console
|
|
|
290 wasn't created, then die now (the error was already printed out
|
|
|
291 on the terminal device). */
|
|
|
292 if (!noninteractive &&
|
|
|
293 (!CONSOLEP (Vselected_console) ||
|
|
|
294 CONSOLE_STREAM_P (XCONSOLE (Vselected_console))))
|
|
|
295 Fkill_emacs (make_int (-1));
|
|
|
296
|
|
|
297 /* End of -batch run causes exit here. */
|
|
|
298 if (noninteractive)
|
|
|
299 Fkill_emacs (Qt);
|
|
|
300
|
|
|
301 for (;;)
|
|
|
302 {
|
|
|
303 command_loop_level = 0;
|
|
|
304 MARK_MODELINE_CHANGED;
|
|
|
305 /* Now invoke the command loop. It never returns; however, a
|
|
|
306 throw to 'top-level will place us at the end of this loop. */
|
|
|
307 internal_catch (Qtop_level, command_loop_2, Qnil, 0);
|
|
|
308 /* #### wrong with selected-console? */
|
|
|
309 /* We don't actually call clear_echo_area() here, partially
|
|
|
310 at least because that runs Lisp code and it may be unsafe
|
|
|
311 to do so -- we are outside of the normal catches for
|
|
|
312 errors and such. */
|
|
|
313 reset_this_command_keys (Vselected_console, 0);
|
|
|
314 }
|
|
|
315 }
|
|
|
316
|
|
|
317 /* This function is invoked when a macro or minibuffer starts up.
|
|
|
318 Normal termination of the macro or minibuffer causes a throw past us.
|
|
|
319 See the comment above.
|
|
|
320
|
|
|
321 Note that this function never returns (but may be thrown out of). */
|
|
|
322
|
|
|
323 Lisp_Object
|
|
|
324 call_command_loop (Lisp_Object catch_errors)
|
|
|
325 {
|
|
|
326 /* This function can GC */
|
|
|
327 if (NILP (catch_errors))
|
|
|
328 return (command_loop_1 (Qnil));
|
|
|
329 else
|
|
|
330 return (command_loop_2 (Qnil));
|
|
|
331 }
|
|
|
332
|
|
|
333 static Lisp_Object
|
|
|
334 recursive_edit_unwind (Lisp_Object buffer)
|
|
|
335 {
|
|
|
336 if (!NILP (buffer))
|
|
|
337 Fset_buffer (buffer);
|
|
|
338
|
|
|
339 command_loop_level--;
|
|
|
340 MARK_MODELINE_CHANGED;
|
|
|
341
|
|
|
342 return Qnil;
|
|
|
343 }
|
|
|
344
|
|
|
345 DEFUN ("recursive-edit", Frecursive_edit, 0, 0, "", /*
|
|
|
346 Invoke the editor command loop recursively.
|
|
|
347 To get out of the recursive edit, a command can do `(throw 'exit nil)';
|
|
|
348 that tells this function to return.
|
|
|
349 Alternately, `(throw 'exit t)' makes this function signal an error.
|
|
|
350 */
|
|
|
351 ())
|
|
|
352 {
|
|
|
353 /* This function can GC */
|
|
|
354 Lisp_Object val;
|
|
|
355 int speccount = specpdl_depth ();
|
|
|
356
|
|
|
357 command_loop_level++;
|
|
|
358 MARK_MODELINE_CHANGED;
|
|
|
359
|
|
|
360 record_unwind_protect (recursive_edit_unwind,
|
|
|
361 ((current_buffer
|
|
|
362 != XBUFFER (XWINDOW (Fselected_window
|
|
|
363 (Qnil))->buffer))
|
|
|
364 ? Fcurrent_buffer ()
|
|
|
365 : Qnil));
|
|
|
366
|
|
|
367 specbind (Qstandard_output, Qt);
|
|
|
368 specbind (Qstandard_input, Qt);
|
|
|
369
|
|
|
370 val = internal_catch (Qexit, command_loop_2, Qnil, 0);
|
|
|
371
|
|
|
372 if (EQ (val, Qt))
|
|
|
373 /* Turn abort-recursive-edit into a quit. */
|
|
|
374 Fsignal (Qquit, Qnil);
|
|
|
375
|
|
771
|
376 return unbind_to (speccount);
|
|
428
|
377 }
|
|
|
378
|
|
|
379 #endif /* !LISP_COMMAND_LOOP */
|
|
|
380
|
|
|
381
|
|
|
382 /**********************************************************************/
|
|
|
383 /* Alternate command-loop (largely in Lisp) */
|
|
|
384 /**********************************************************************/
|
|
|
385
|
|
|
386 #ifdef LISP_COMMAND_LOOP
|
|
|
387
|
|
|
388 static Lisp_Object
|
|
|
389 load1 (Lisp_Object name)
|
|
|
390 {
|
|
|
391 /* This function can GC */
|
|
|
392 call4 (Qload, name, Qnil, Qt, Qnil);
|
|
|
393 return (Qnil);
|
|
|
394 }
|
|
|
395
|
|
|
396 /* emergency backups for cold-load-stream use */
|
|
|
397 static Lisp_Object
|
|
|
398 cold_load_command_error (Lisp_Object datum, Lisp_Object ignored)
|
|
|
399 {
|
|
|
400 /* This function can GC */
|
|
|
401 check_quit (); /* make Vquit_flag accurate */
|
|
|
402 Vquit_flag = Qnil;
|
|
|
403
|
|
|
404 return default_error_handler (datum);
|
|
|
405 }
|
|
|
406
|
|
|
407 static Lisp_Object
|
|
|
408 cold_load_command_loop (Lisp_Object dummy)
|
|
|
409 {
|
|
|
410 /* This function can GC */
|
|
|
411 return (condition_case_1 (Qt,
|
|
|
412 command_loop_1, Qnil,
|
|
|
413 cold_load_command_error, Qnil));
|
|
|
414 }
|
|
|
415
|
|
|
416 Lisp_Object
|
|
|
417 call_command_loop (Lisp_Object catch_errors)
|
|
|
418 {
|
|
|
419 /* This function can GC */
|
|
479
|
420 reset_this_command_keys (Vselected_console, 0); /* #### bleagh */
|
|
428
|
421
|
|
|
422 loop:
|
|
|
423 for (;;)
|
|
|
424 {
|
|
|
425 if (NILP (Vcommand_loop))
|
|
|
426 break;
|
|
|
427 call1 (Vcommand_loop, catch_errors);
|
|
|
428 }
|
|
|
429
|
|
|
430 /* This isn't a "correct" definition, but you're pretty hosed if
|
|
|
431 you broke "command-loop" anyway */
|
|
|
432 /* #### not correct with Vselected_console */
|
|
|
433 XCONSOLE (Vselected_console)->prefix_arg = Qnil;
|
|
|
434 if (NILP (catch_errors))
|
|
|
435 Fcommand_loop_1 ();
|
|
|
436 else
|
|
|
437 internal_catch (Qtop_level,
|
|
|
438 cold_load_command_loop, Qnil, 0);
|
|
|
439 goto loop;
|
|
|
440 return Qnil;
|
|
|
441 }
|
|
|
442
|
|
|
443 static Lisp_Object
|
|
|
444 initial_error_handler (Lisp_Object datum, Lisp_Object ignored)
|
|
|
445 {
|
|
|
446 /* This function can GC */
|
|
|
447 Vcommand_loop = Qnil;
|
|
|
448 Fding (Qnil, Qnil, Qnil);
|
|
|
449
|
|
|
450 if (CONSP (datum) && EQ (XCAR (datum), Qquit))
|
|
|
451 /* Don't bother with the message */
|
|
|
452 return (Qt);
|
|
|
453
|
|
|
454 message ("Error in command-loop!!");
|
|
|
455 Fset (intern ("last-error"), datum); /* #### Better/different name? */
|
|
|
456 Fsit_for (make_int (2), Qnil);
|
|
|
457 cold_load_command_error (datum, Qnil);
|
|
|
458 return (Qt);
|
|
|
459 }
|
|
|
460
|
|
|
461 DOESNT_RETURN
|
|
|
462 initial_command_loop (Lisp_Object load_me)
|
|
|
463 {
|
|
|
464 /* This function can GC */
|
|
|
465 if (!NILP (load_me))
|
|
|
466 {
|
|
|
467 if (!NILP (condition_case_1 (Qt, load1, load_me,
|
|
|
468 initial_error_handler, Qnil)))
|
|
|
469 Fkill_emacs (make_int (-1));
|
|
|
470 }
|
|
|
471
|
|
|
472 for (;;)
|
|
|
473 {
|
|
|
474 command_loop_level = 0;
|
|
|
475 MARK_MODELINE_CHANGED;
|
|
|
476
|
|
|
477 condition_case_1 (Qt,
|
|
|
478 call_command_loop, Qtop_level,
|
|
|
479 initial_error_handler, Qnil);
|
|
|
480 }
|
|
|
481 }
|
|
|
482
|
|
|
483 #endif /* LISP_COMMAND_LOOP */
|
|
|
484
|
|
|
485
|
|
|
486 /**********************************************************************/
|
|
|
487 /* Guts of command loop */
|
|
|
488 /**********************************************************************/
|
|
|
489
|
|
|
490 static Lisp_Object
|
|
|
491 command_loop_1 (Lisp_Object dummy)
|
|
|
492 {
|
|
|
493 /* This function can GC */
|
|
|
494 /* #### not correct with Vselected_console */
|
|
|
495 XCONSOLE (Vselected_console)->prefix_arg = Qnil;
|
|
|
496 return (Fcommand_loop_1 ());
|
|
|
497 }
|
|
|
498
|
|
|
499 /* This is the actual command reading loop, sans error-handling
|
|
|
500 encapsulation. This is used for both the C and Lisp command
|
|
|
501 loops. Originally this function was written in Lisp when
|
|
|
502 the Lisp command loop was used, but it was too slow that way.
|
|
|
503
|
|
|
504 Under the C command loop, this function will never return
|
|
|
505 (although someone might throw past it). Under the Lisp
|
|
|
506 command loop, this will return only when the user specifies
|
|
|
507 a new command loop by changing the command-loop variable. */
|
|
|
508
|
|
|
509 DEFUN ("command-loop-1", Fcommand_loop_1, 0, 0, 0, /*
|
|
|
510 Invoke the internals of the canonical editor command loop.
|
|
|
511 Don't call this unless you know what you're doing.
|
|
|
512 */
|
|
|
513 ())
|
|
|
514 {
|
|
|
515 /* This function can GC */
|
|
|
516 Lisp_Object event = Fmake_event (Qnil, Qnil);
|
|
|
517 Lisp_Object old_loop = Qnil;
|
|
|
518 struct gcpro gcpro1, gcpro2;
|
|
|
519 int was_locked = in_single_console_state ();
|
|
|
520 GCPRO2 (event, old_loop);
|
|
|
521
|
|
|
522 /* cancel_echoing (); */
|
|
|
523 /* This magically makes single character keyboard macros work just
|
|
|
524 like the real thing. This is slightly bogus, but it's in here for
|
|
|
525 compatibility with Emacs 18. It's not even clear what the "right
|
|
|
526 thing" is. */
|
|
434
|
527 if (!((STRINGP (Vexecuting_macro) || VECTORP (Vexecuting_macro))
|
|
|
528 && XINT (Flength (Vexecuting_macro)) == 1))
|
|
428
|
529 Vlast_command = Qt;
|
|
|
530
|
|
|
531 #ifndef LISP_COMMAND_LOOP
|
|
|
532 while (1)
|
|
|
533 #else
|
|
|
534 old_loop = Vcommand_loop;
|
|
|
535 while (EQ (Vcommand_loop, old_loop))
|
|
|
536 #endif /* LISP_COMMAND_LOOP */
|
|
|
537 {
|
|
|
538 /* If focus_follows_mouse, make sure the frame with window manager
|
|
|
539 focus is selected. */
|
|
|
540 if (focus_follows_mouse)
|
|
|
541 investigate_frame_change ();
|
|
434
|
542
|
|
428
|
543 /* Make sure the current window's buffer is selected. */
|
|
|
544 {
|
|
|
545 Lisp_Object selected_window = Fselected_window (Qnil);
|
|
|
546
|
|
|
547 if (!NILP (selected_window) &&
|
|
|
548 (XBUFFER (XWINDOW (selected_window)->buffer) != current_buffer))
|
|
|
549 {
|
|
|
550 set_buffer_internal (XBUFFER (XWINDOW (selected_window)->buffer));
|
|
|
551 }
|
|
|
552 }
|
|
|
553
|
|
444
|
554 #if 0 /* What's wrong with going through ordinary procedure of quit?
|
|
|
555 quitting here leaves overriding-terminal-local-map
|
|
|
556 when you type C-u C-u C-g. */
|
|
428
|
557 /* If ^G was typed before we got here (that is, before emacs was
|
|
|
558 idle and waiting for input) then we treat that as an interrupt. */
|
|
|
559 QUIT;
|
|
444
|
560 #endif
|
|
428
|
561
|
|
|
562 /* If minibuffer on and echo area in use, wait 2 sec and redraw
|
|
|
563 minibuffer. Treat a ^G here as a command, not an interrupt.
|
|
|
564 */
|
|
|
565 if (minibuf_level > 0 && echo_area_active (selected_frame ()))
|
|
|
566 {
|
|
|
567 /* Bind dont_check_for_quit to 1 so that C-g gets read in
|
|
|
568 rather than quitting back to the minibuffer. */
|
|
771
|
569 int count = begin_dont_check_for_quit ();
|
|
428
|
570 Fsit_for (make_int (2), Qnil);
|
|
|
571 clear_echo_area (selected_frame (), Qnil, 0);
|
|
771
|
572 unbind_to (count);
|
|
428
|
573 }
|
|
|
574
|
|
|
575 Fnext_event (event, Qnil);
|
|
|
576 /* If ^G was typed while emacs was reading input from the user, then
|
|
|
577 Fnext_event() will have read it as a normal event and
|
|
|
578 next_event_internal() will have set Vquit_flag. We reset this
|
|
|
579 so that the ^G is treated as just another key. This is strange,
|
|
|
580 but it is what emacs 18 did.
|
|
|
581
|
|
|
582 Do not call check_quit() here. */
|
|
|
583 Vquit_flag = Qnil;
|
|
|
584 Fdispatch_event (event);
|
|
|
585
|
|
|
586 if (!was_locked)
|
|
|
587 any_console_state ();
|
|
|
588 #if (defined (_MSC_VER) \
|
|
|
589 || defined (__SUNPRO_C) \
|
|
|
590 || defined (__SUNPRO_CC) \
|
|
|
591 || (defined (DEC_ALPHA) \
|
|
|
592 && defined (OSF1)))
|
|
|
593 if (0) return Qnil; /* Shut up compiler */
|
|
|
594 #endif
|
|
|
595 }
|
|
|
596 #ifdef LISP_COMMAND_LOOP
|
|
|
597 UNGCPRO;
|
|
|
598 return Qnil;
|
|
|
599 #endif
|
|
|
600 }
|
|
|
601
|
|
|
602
|
|
|
603 /**********************************************************************/
|
|
|
604 /* Initialization */
|
|
|
605 /**********************************************************************/
|
|
|
606
|
|
|
607 void
|
|
|
608 syms_of_cmdloop (void)
|
|
|
609 {
|
|
733
|
610 DEFSYMBOL (Qdisabled_command_hook);
|
|
563
|
611 DEFSYMBOL (Qcommand_error);
|
|
|
612 DEFSYMBOL (Qreally_early_error_handler);
|
|
|
613 DEFSYMBOL (Qtop_level);
|
|
|
614 DEFSYMBOL (Qerrors_deactivate_region);
|
|
428
|
615
|
|
|
616 #ifndef LISP_COMMAND_LOOP
|
|
|
617 DEFSUBR (Frecursive_edit);
|
|
|
618 #endif
|
|
|
619 DEFSUBR (Freally_early_error_handler);
|
|
|
620 DEFSUBR (Fcommand_loop_1);
|
|
|
621 }
|
|
|
622
|
|
|
623 void
|
|
|
624 vars_of_cmdloop (void)
|
|
|
625 {
|
|
|
626 DEFVAR_INT ("command-loop-level", &command_loop_level /*
|
|
|
627 Number of recursive edits in progress.
|
|
|
628 */ );
|
|
|
629 command_loop_level = 0;
|
|
|
630
|
|
|
631 DEFVAR_LISP ("disabled-command-hook", &Vdisabled_command_hook /*
|
|
|
632 Value is called instead of any command that is disabled,
|
|
|
633 i.e. has a non-nil `disabled' property.
|
|
|
634 */ );
|
|
|
635 Vdisabled_command_hook = intern ("disabled-command-hook");
|
|
|
636
|
|
|
637 DEFVAR_LISP ("leave-window-hook", &Vleave_window_hook /*
|
|
|
638 Not yet implemented.
|
|
|
639 */ );
|
|
|
640 Vleave_window_hook = Qnil;
|
|
|
641
|
|
|
642 DEFVAR_LISP ("enter-window-hook", &Venter_window_hook /*
|
|
|
643 Not yet implemented.
|
|
|
644 */ );
|
|
|
645 Venter_window_hook = Qnil;
|
|
|
646
|
|
|
647 #ifndef LISP_COMMAND_LOOP
|
|
|
648 DEFVAR_LISP ("top-level", &Vtop_level /*
|
|
|
649 Form to evaluate when Emacs starts up.
|
|
|
650 Useful to set before you dump a modified Emacs.
|
|
|
651 */ );
|
|
|
652 Vtop_level = Qnil;
|
|
|
653 #else
|
|
|
654 DEFVAR_LISP ("command-loop", &Vcommand_loop /*
|
|
|
655 Function or one argument to call to read and process keyboard commands.
|
|
|
656 The passed argument specifies whether or not to handle errors.
|
|
|
657 */ );
|
|
|
658 Vcommand_loop = Qnil;
|
|
|
659 #endif /* LISP_COMMAND_LOOP */
|
|
|
660 }
|
