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a2889657 JB |
1 | /* Display generation from window structure and buffer text. |
2 | Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | #include "config.h" | |
22 | #include <stdio.h> | |
23 | /*#include <ctype.h>*/ | |
24 | #undef NULL | |
25 | #include "lisp.h" | |
26 | #include "screen.h" | |
27 | #include "window.h" | |
28 | #include "termchar.h" | |
29 | #include "dispextern.h" | |
30 | #include "buffer.h" | |
31 | #include "indent.h" | |
32 | #include "commands.h" | |
33 | #include "macros.h" | |
34 | #include "disptab.h" | |
35 | ||
36 | extern int interrupt_input; | |
37 | extern int command_loop_level; | |
38 | ||
39 | /* Nonzero means print newline before next minibuffer message. */ | |
40 | ||
41 | int noninteractive_need_newline; | |
42 | ||
43 | #define min(a, b) ((a) < (b) ? (a) : (b)) | |
44 | #define max(a, b) ((a) > (b) ? (a) : (b)) | |
45 | ||
46 | /* The buffer position of the first character appearing | |
47 | entirely or partially on the current screen line. | |
48 | Or zero, which disables the optimization for the current screen line. */ | |
49 | static int this_line_bufpos; | |
50 | ||
51 | /* Number of characters past the end of this line, | |
52 | including the terminating newline */ | |
53 | static int this_line_endpos; | |
54 | ||
55 | /* The vertical position of this screen line. */ | |
56 | static int this_line_vpos; | |
57 | ||
58 | /* Hpos value for start of display on this screen line. | |
59 | Usually zero, but negative if first character really began | |
60 | on previous line */ | |
61 | static int this_line_start_hpos; | |
62 | ||
63 | /* Buffer that this_line variables are describing. */ | |
64 | static struct buffer *this_line_buffer; | |
65 | ||
66 | /* Set by try_window_id to the vpos of first of any lines | |
67 | scrolled on to the bottom of the screen. These lines should | |
68 | not be included in any general scroll computation. */ | |
69 | static int scroll_bottom_vpos; | |
70 | ||
71 | /* Value of echo_area_glyphs when it was last acted on. | |
72 | If this is nonzero, there is a message on the screen | |
73 | in the minibuffer and it should be erased as soon | |
74 | as it is no longer requested to appear. */ | |
75 | char *previous_echo_glyphs; | |
76 | ||
77 | /* Nonzero means truncate lines in all windows less wide than the screen */ | |
78 | int truncate_partial_width_windows; | |
79 | ||
80 | Lisp_Object Vglobal_mode_string; | |
81 | ||
82 | /* Marker for where to display an arrow on top of the buffer text. */ | |
83 | Lisp_Object Voverlay_arrow_position; | |
84 | ||
85 | /* String to display for the arrow. */ | |
86 | Lisp_Object Voverlay_arrow_string; | |
87 | ||
88 | /* Values of those variables at last redisplay. */ | |
89 | Lisp_Object last_arrow_position, last_arrow_string; | |
90 | ||
91 | /* Nonzero if overlay arrow has been displayed once in this window. */ | |
92 | static int overlay_arrow_seen; | |
93 | ||
94 | /* If cursor motion alone moves point off screen, | |
95 | Try scrolling this many lines up or down if that will bring it back. */ | |
96 | int scroll_step; | |
97 | ||
98 | /* Nonzero if try_window_id has made blank lines at window bottom | |
99 | since the last redisplay that paused */ | |
100 | static int blank_end_of_window; | |
101 | ||
102 | /* Number of windows showing the buffer of the selected window. | |
103 | keyboard.c refers to this. */ | |
104 | int buffer_shared; | |
105 | ||
106 | /* display_text_line sets these to the screen position (origin 0) of point, | |
107 | whether the window is selected or not. | |
108 | Set one to -1 first to determine whether point was found afterwards. */ | |
109 | ||
110 | static int cursor_vpos; | |
111 | static int cursor_hpos; | |
112 | ||
113 | int debug_end_pos; | |
114 | ||
115 | /* Nonzero means display mode line highlighted */ | |
116 | int mode_line_inverse_video; | |
117 | ||
118 | static void echo_area_display (); | |
119 | void mark_window_display_accurate (); | |
120 | static void redisplay_windows (); | |
121 | static void redisplay_window (); | |
122 | static void try_window (); | |
123 | static int try_window_id (); | |
124 | static struct position *display_text_line (); | |
125 | static void display_mode_line (); | |
126 | static int display_mode_element (); | |
127 | static char *fmodetrunc (); | |
128 | static char *decode_mode_spec (); | |
129 | static int display_string (); | |
130 | ||
131 | /* Prompt to display in front of the minibuffer contents */ | |
132 | char *minibuf_prompt; | |
133 | ||
134 | /* Width in columns of current minibuffer prompt. */ | |
135 | int minibuf_prompt_width; | |
136 | ||
137 | /* Message to display instead of minibuffer contents | |
138 | This is what the functions error and message make, | |
139 | and command echoing uses it as well. | |
140 | It overrides the minibuf_prompt as well as the buffer. */ | |
141 | char *echo_area_glyphs; | |
142 | ||
143 | /* true iff we should redraw the mode lines on the next redisplay */ | |
144 | int update_mode_lines; | |
145 | ||
146 | /* Smallest number of characters before the gap | |
147 | at any time since last redisplay that finished. | |
148 | Valid for current buffer when try_window_id can be called. */ | |
149 | int beg_unchanged; | |
150 | ||
151 | /* Smallest number of characters after the gap | |
152 | at any time since last redisplay that finished. | |
153 | Valid for current buffer when try_window_id can be called. */ | |
154 | int end_unchanged; | |
155 | ||
156 | /* MODIFF as of last redisplay that finished; | |
157 | if it matches MODIFF, beg_unchanged and end_unchanged | |
158 | contain no useful information */ | |
159 | int unchanged_modified; | |
160 | ||
161 | /* Nonzero if head_clip or tail_clip of current buffer has changed | |
162 | since last redisplay that finished */ | |
163 | int clip_changed; | |
164 | ||
165 | /* Nonzero if window sizes or contents have changed | |
166 | since last redisplay that finished */ | |
167 | int windows_or_buffers_changed; | |
168 | ||
169 | \f | |
170 | #ifndef MULTI_SCREEN | |
171 | ||
172 | DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "", | |
173 | "Clear the screen and output again what is supposed to appear on it.") | |
174 | () | |
175 | { | |
176 | if (screen_height == 0) abort (); /* Some bug zeros some core */ | |
177 | clear_screen (); | |
178 | fflush (stdout); | |
179 | clear_screen_records (); | |
180 | if (screen_height == 0) abort (); /* Some bug zeros some core */ | |
181 | windows_or_buffers_changed++; | |
182 | /* Mark all windows as INaccurate, | |
183 | so that every window will have its redisplay done. */ | |
184 | mark_window_display_accurate (XWINDOW (minibuf_window)->prev, 0); | |
185 | if (screen_height == 0) abort (); /* Some bug zeros some core */ | |
186 | return Qnil; | |
187 | } | |
188 | ||
189 | #endif /* not MULTI_SCREEN */ | |
190 | \f | |
191 | char *message_buf; | |
192 | ||
193 | /* dump an informative message to the minibuf */ | |
194 | /* VARARGS 1 */ | |
195 | ||
196 | void | |
197 | message (m, a1, a2, a3) | |
198 | char *m; | |
199 | { | |
200 | if (noninteractive) | |
201 | { | |
202 | if (noninteractive_need_newline) | |
203 | putc ('\n', stderr); | |
204 | noninteractive_need_newline = 0; | |
205 | fprintf (stderr, m, a1, a2, a3); | |
206 | fprintf (stderr, "\n"); | |
207 | fflush (stderr); | |
208 | } | |
209 | else if (INTERACTIVE) | |
210 | { | |
211 | #ifdef NO_ARG_ARRAY | |
212 | int a[3]; | |
213 | a[0] = a1; | |
214 | a[1] = a2; | |
215 | a[2] = a3; | |
216 | ||
217 | doprnt (SCREEN_MESSAGE_BUF (selected_screen), | |
218 | SCREEN_WIDTH (selected_screen), m, 0, 3, a); | |
219 | #else | |
220 | doprnt (SCREEN_MESSAGE_BUF (selected_screen), | |
221 | SCREEN_WIDTH (selected_screen), m, 0, 3, &a1); | |
222 | #endif /* NO_ARG_ARRAY */ | |
223 | ||
224 | echo_area_glyphs = SCREEN_MESSAGE_BUF (selected_screen); | |
225 | do_pending_window_change (); | |
226 | echo_area_display (); | |
227 | update_screen (XSCREEN (XWINDOW (minibuf_window)->screen), 1, 1); | |
228 | do_pending_window_change (); | |
229 | } | |
230 | } | |
231 | ||
232 | /* Specify m, a string, as a message in the minibuf. */ | |
233 | void | |
234 | message1 (m) | |
235 | char *m; | |
236 | { | |
237 | if (!NULL (Vwindow_system) && SCREEN_IS_TERMCAP (selected_screen)) | |
238 | return; | |
239 | ||
240 | if (noninteractive) | |
241 | { | |
242 | if (noninteractive_need_newline) | |
243 | putc ('\n', stderr); | |
244 | noninteractive_need_newline = 0; | |
245 | fprintf (stderr, "%s\n", m); | |
246 | fflush (stderr); | |
247 | } | |
248 | else if (INTERACTIVE) | |
249 | { | |
250 | echo_area_glyphs = m; | |
251 | do_pending_window_change (); | |
252 | echo_area_display (); | |
253 | update_screen (XSCREEN (XWINDOW (minibuf_window)->screen), 1, 1); | |
254 | do_pending_window_change (); | |
255 | } | |
256 | } | |
257 | ||
258 | static void | |
259 | echo_area_display () | |
260 | { | |
261 | register int vpos; | |
262 | SCREEN_PTR s; | |
263 | ||
264 | #ifdef MULTI_SCREEN | |
265 | choose_minibuf_screen (); | |
266 | s = XSCREEN (XWINDOW (minibuf_window)->screen); | |
267 | ||
268 | if (!s->visible) | |
269 | return; | |
270 | #endif | |
271 | ||
272 | if (screen_garbaged) | |
273 | { | |
274 | Fredraw_display (); | |
275 | screen_garbaged = 0; | |
276 | } | |
277 | ||
278 | if (echo_area_glyphs || minibuf_level == 0) | |
279 | { | |
280 | vpos = XFASTINT (XWINDOW (minibuf_window)->top); | |
281 | get_display_line (s, vpos, 0); | |
282 | display_string (XWINDOW (minibuf_window), vpos, | |
283 | echo_area_glyphs ? echo_area_glyphs : "", | |
284 | 0, 0, 0, SCREEN_WIDTH (s)); | |
285 | ||
286 | /* If desired cursor location is on this line, put it at end of text */ | |
287 | if (SCREEN_CURSOR_Y (s) == vpos) | |
288 | SCREEN_CURSOR_X (s) = s->desired_glyphs->used[vpos]; | |
289 | } | |
290 | else if (!EQ (minibuf_window, selected_window)) | |
291 | windows_or_buffers_changed++; | |
292 | ||
293 | if (EQ (minibuf_window, selected_window)) | |
294 | this_line_bufpos = 0; | |
295 | ||
296 | previous_echo_glyphs = echo_area_glyphs; | |
297 | } | |
298 | \f | |
299 | /* Do a screen update, taking possible shortcuts into account. | |
300 | This is the main external entry point for redisplay. | |
301 | ||
302 | If the last redisplay displayed an echo area message and that | |
303 | message is no longer requested, we clear the echo area | |
304 | or bring back the minibuffer if that is in use. | |
305 | ||
306 | Everyone would like to have a hook here to call eval, | |
307 | but that cannot be done safely without a lot of changes elsewhere. | |
308 | This can be called from signal handlers; with alarms set up; | |
309 | or with synchronous processes running. | |
310 | See the function `echo' in keyboard.c. | |
311 | See Fcall_process; if you called it from here, it could be | |
312 | entered recursively. */ | |
313 | ||
314 | void | |
315 | redisplay () | |
316 | { | |
317 | register struct window *w = XWINDOW (selected_window); | |
318 | register int pause; | |
319 | int must_finish = 0; | |
320 | int all_windows; | |
321 | register int tlbufpos, tlendpos; | |
322 | struct position pos; | |
323 | extern int input_pending; | |
324 | ||
325 | if (noninteractive) | |
326 | return; | |
327 | ||
328 | /* Notice any pending interrupt request to change screen size. */ | |
329 | do_pending_window_change (); | |
330 | ||
331 | if (screen_garbaged) | |
332 | { | |
333 | Fredraw_display (); | |
334 | screen_garbaged = 0; | |
335 | } | |
336 | ||
337 | if (echo_area_glyphs || previous_echo_glyphs) | |
338 | { | |
339 | echo_area_display (); | |
340 | must_finish = 1; | |
341 | } | |
342 | ||
343 | if (clip_changed || windows_or_buffers_changed) | |
344 | update_mode_lines++; | |
345 | ||
346 | /* Detect case that we need to write a star in the mode line. */ | |
347 | if (XFASTINT (w->last_modified) < MODIFF | |
348 | && XFASTINT (w->last_modified) <= current_buffer->save_modified) | |
349 | { | |
350 | w->update_mode_line = Qt; | |
351 | if (buffer_shared > 1) | |
352 | update_mode_lines++; | |
353 | } | |
354 | ||
355 | SCREEN_SCROLL_BOTTOM_VPOS (XSCREEN (w->screen)) = -1; | |
356 | ||
357 | all_windows = update_mode_lines || buffer_shared > 1; | |
358 | #ifdef MULTI_SCREEN | |
359 | all_windows |= (XTYPE (Vglobal_minibuffer_screen) == Lisp_Screen | |
360 | && selected_screen != XSCREEN (Vglobal_minibuffer_screen)); | |
361 | #endif /* MULTI_SCREEN */ | |
362 | ||
363 | /* If specs for an arrow have changed, do thorough redisplay | |
364 | to ensure we remove any arrow that should no longer exist. */ | |
365 | if (Voverlay_arrow_position != last_arrow_position | |
366 | || Voverlay_arrow_string != last_arrow_string) | |
367 | all_windows = 1, clip_changed = 1; | |
368 | ||
369 | tlbufpos = this_line_bufpos; | |
370 | tlendpos = this_line_endpos; | |
371 | if (!all_windows && tlbufpos > 0 && NULL (w->update_mode_line) | |
372 | && SCREEN_VISIBLE_P (XSCREEN (w->screen)) | |
373 | /* Make sure recorded data applies to current buffer, etc */ | |
374 | && this_line_buffer == current_buffer | |
375 | && current_buffer == XBUFFER (w->buffer) | |
376 | && NULL (w->force_start) | |
377 | /* Point must be on the line that we have info recorded about */ | |
378 | && point >= tlbufpos | |
379 | && point <= Z - tlendpos | |
380 | /* All text outside that line, including its final newline, | |
381 | must be unchanged */ | |
382 | && (XFASTINT (w->last_modified) >= MODIFF | |
383 | || (beg_unchanged >= tlbufpos - 1 | |
384 | && GPT >= tlbufpos | |
385 | && end_unchanged >= tlendpos | |
386 | && Z - GPT >= tlendpos))) | |
387 | { | |
388 | if (tlbufpos > BEGV && FETCH_CHAR (tlbufpos - 1) != '\n' | |
389 | && (tlbufpos == ZV | |
390 | || FETCH_CHAR (tlbufpos) == '\n')) | |
391 | /* Former continuation line has disappeared by becoming empty */ | |
392 | goto cancel; | |
393 | else if (XFASTINT (w->last_modified) < MODIFF | |
394 | || MINI_WINDOW_P (w)) | |
395 | { | |
396 | cursor_vpos = -1; | |
397 | overlay_arrow_seen = 0; | |
398 | display_text_line (w, tlbufpos, this_line_vpos, this_line_start_hpos, | |
399 | pos_tab_offset (w, tlbufpos)); | |
400 | /* If line contains point, is not continued, | |
401 | and ends at same distance from eob as before, we win */ | |
402 | if (cursor_vpos >= 0 && this_line_bufpos | |
403 | && this_line_endpos == tlendpos) | |
404 | { | |
405 | if (XFASTINT (w->width) != SCREEN_WIDTH (XSCREEN (WINDOW_SCREEN (w)))) | |
406 | preserve_other_columns (w); | |
407 | goto update; | |
408 | } | |
409 | else | |
410 | goto cancel; | |
411 | } | |
412 | else if (point == XFASTINT (w->last_point)) | |
413 | { | |
414 | if (!must_finish) | |
415 | { | |
416 | do_pending_window_change (); | |
417 | return; | |
418 | } | |
419 | goto update; | |
420 | } | |
421 | else | |
422 | { | |
423 | pos = *compute_motion (tlbufpos, 0, | |
424 | XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0, | |
425 | point, 2, - (1 << (SHORTBITS - 1)), | |
426 | XFASTINT (w->width) - 1 | |
427 | - (XFASTINT (w->width) + XFASTINT (w->left) | |
428 | != SCREEN_WIDTH (selected_screen)), | |
429 | XINT (w->hscroll), 0); | |
430 | if (pos.vpos < 1) | |
431 | { | |
432 | SCREEN_CURSOR_X (selected_screen) | |
433 | = XFASTINT (w->left) + max (pos.hpos, 0); | |
434 | SCREEN_CURSOR_Y (selected_screen) = this_line_vpos; | |
435 | goto update; | |
436 | } | |
437 | else | |
438 | goto cancel; | |
439 | } | |
440 | cancel: | |
441 | /* Text changed drastically or point moved off of line */ | |
442 | cancel_line (this_line_vpos, selected_screen); | |
443 | } | |
444 | ||
445 | this_line_bufpos = 0; | |
446 | all_windows |= buffer_shared > 1; | |
447 | ||
448 | if (all_windows) | |
449 | { | |
450 | #ifdef MULTI_SCREEN | |
451 | Lisp_Object tail; | |
452 | ||
453 | /* Recompute # windows showing selected buffer. | |
454 | This will be increment each time such a window is displayed. */ | |
455 | buffer_shared = 0; | |
456 | ||
457 | for (tail = Vscreen_list; CONSP (tail); tail = XCONS (tail)->cdr) | |
458 | { | |
459 | SCREEN_PTR s; | |
460 | ||
461 | if (XTYPE (XCONS (tail)->car) != Lisp_Screen) | |
462 | continue; | |
463 | ||
464 | s = XSCREEN (XCONS (tail)->car); | |
465 | if (s->visible) | |
466 | { | |
467 | ||
468 | /* Clear the echo area on screens where the minibuffer isn't. */ | |
469 | if (s != XSCREEN (XWINDOW (minibuf_window)->screen) | |
470 | /* But only screens that have minibuffers. */ | |
471 | && s->has_minibuffer) | |
472 | { | |
473 | int vpos = XFASTINT (XWINDOW (s->minibuffer_window)->top); | |
474 | register struct screen_glyphs *line; | |
475 | ||
476 | get_display_line (s, vpos, 0); | |
477 | display_string (XWINDOW (s->minibuffer_window), vpos, "", | |
478 | 0, 0, 0, s->width); | |
479 | } | |
480 | ||
481 | /* Redraw its windows. */ | |
482 | redisplay_windows (SCREEN_ROOT_WINDOW (s)); | |
483 | } | |
484 | } | |
485 | #else | |
486 | redisplay_windows (SCREEN_ROOT_WINDOW (s)); | |
487 | #endif /* not MULTI_SCREEN */ | |
488 | } | |
489 | else if (SCREEN_VISIBLE_P (selected_screen)) | |
490 | { | |
491 | redisplay_window (selected_window, 1); | |
492 | if (XFASTINT (w->width) != SCREEN_WIDTH (selected_screen)) | |
493 | preserve_other_columns (w); | |
494 | } | |
495 | ||
496 | update: | |
497 | /* Prevent various kinds of signals during display update. | |
498 | stdio is not robust about handling signals, | |
499 | which can cause an apparent I/O error. */ | |
500 | if (interrupt_input) | |
501 | unrequest_sigio (); | |
502 | stop_polling (); | |
503 | ||
504 | #ifdef MULTI_SCREEN | |
505 | if (all_windows) | |
506 | { | |
507 | Lisp_Object tail; | |
508 | ||
509 | pause = 0; | |
510 | ||
511 | for (tail = Vscreen_list; CONSP (tail); tail = XCONS (tail)->cdr) | |
512 | { | |
513 | SCREEN_PTR s; | |
514 | ||
515 | if (XTYPE (XCONS (tail)->car) != Lisp_Screen) | |
516 | continue; | |
517 | ||
518 | s = XSCREEN (XCONS (tail)->car); | |
519 | if (s->visible) | |
520 | { | |
521 | pause |= update_screen (s, 0, 0, SCREEN_SCROLL_BOTTOM_VPOS (s)); | |
522 | if (!pause) | |
523 | mark_window_display_accurate (s->root_window, 1); | |
524 | } | |
525 | } | |
526 | } | |
527 | else | |
528 | #endif /* MULTI_SCREEN */ | |
529 | if (SCREEN_VISIBLE_P (selected_screen)) | |
530 | pause = update_screen (selected_screen, 0, 0); | |
531 | ||
532 | /* If screen does not match, prevent doing single-line-update next time. | |
533 | Also, don't forget to check every line to update the arrow. */ | |
534 | if (pause) | |
535 | { | |
536 | this_line_bufpos = 0; | |
537 | if (!NULL (last_arrow_position)) | |
538 | { | |
539 | last_arrow_position = Qt; | |
540 | last_arrow_string = Qt; | |
541 | } | |
542 | /* If we pause after scrolling, some lines in current_screen | |
543 | may be null, so preserve_other_columns won't be able to | |
544 | preserve all the vertical-bar separators. So, avoid using it | |
545 | in that case. */ | |
546 | if (XFASTINT (w->width) != SCREEN_WIDTH (selected_screen)) | |
547 | update_mode_lines = 1; | |
548 | } | |
549 | ||
550 | /* Now text on screen agrees with windows, so | |
551 | put info into the windows for partial redisplay to follow */ | |
552 | ||
553 | if (!pause) | |
554 | { | |
555 | register struct buffer *b = XBUFFER (w->buffer); | |
556 | ||
557 | blank_end_of_window = 0; | |
558 | clip_changed = 0; | |
559 | unchanged_modified = BUF_MODIFF (b); | |
560 | beg_unchanged = BUF_GPT (b) - BUF_BEG (b); | |
561 | end_unchanged = BUF_Z (b) - BUF_GPT (b); | |
562 | ||
563 | XFASTINT (w->last_point) = BUF_PT (b); | |
564 | XFASTINT (w->last_point_x) = SCREEN_CURSOR_X (selected_screen); | |
565 | XFASTINT (w->last_point_y) = SCREEN_CURSOR_Y (selected_screen); | |
566 | ||
567 | if (all_windows) | |
568 | mark_window_display_accurate (XWINDOW (minibuf_window)->prev, 1); | |
569 | else | |
570 | { | |
571 | w->update_mode_line = Qnil; | |
572 | XFASTINT (w->last_modified) = BUF_MODIFF (b); | |
573 | w->window_end_valid = Qt; | |
574 | last_arrow_position = Voverlay_arrow_position; | |
575 | last_arrow_string = Voverlay_arrow_string; | |
576 | } | |
577 | update_mode_lines = 0; | |
578 | windows_or_buffers_changed = 0; | |
579 | } | |
580 | ||
581 | /* Start SIGIO interrupts coming again. | |
582 | Having them off during the code above | |
583 | makes it less likely one will discard output, | |
584 | but not impossible, since there might be stuff | |
585 | in the system buffer here. | |
586 | But it is much hairier to try to do anything about that. */ | |
587 | ||
588 | if (interrupt_input) | |
589 | request_sigio (); | |
590 | start_polling (); | |
591 | ||
592 | /* Change screen size now if a change is pending. */ | |
593 | do_pending_window_change (); | |
594 | } | |
595 | ||
596 | /* Redisplay, but leave alone any recent echo area message | |
597 | unless another message has been requested in its place. | |
598 | ||
599 | This is useful in situations where you need to redisplay but no | |
600 | user action has occurred, making it inappropriate for the message | |
601 | area to be cleared. See tracking_off and | |
602 | wait_reading_process_input for examples of these situations. */ | |
603 | ||
604 | redisplay_preserve_echo_area () | |
605 | { | |
606 | if (echo_area_glyphs == 0 && previous_echo_glyphs != 0) | |
607 | { | |
608 | echo_area_glyphs = previous_echo_glyphs; | |
609 | redisplay (); | |
610 | echo_area_glyphs = 0; | |
611 | } | |
612 | else | |
613 | redisplay (); | |
614 | } | |
615 | ||
616 | void | |
617 | mark_window_display_accurate (window, flag) | |
618 | Lisp_Object window; | |
619 | int flag; | |
620 | { | |
621 | register struct window *w; | |
622 | ||
623 | for (;!NULL (window); window = w->next) | |
624 | { | |
625 | w = XWINDOW (window); | |
626 | ||
627 | if (!NULL (w->buffer)) | |
628 | XFASTINT (w->last_modified) | |
629 | = !flag ? 0 | |
630 | : XBUFFER (w->buffer) == current_buffer | |
631 | ? MODIFF : BUF_MODIFF (XBUFFER (w->buffer)); | |
632 | w->window_end_valid = Qt; | |
633 | w->update_mode_line = Qnil; | |
634 | ||
635 | if (!NULL (w->vchild)) | |
636 | mark_window_display_accurate (w->vchild, flag); | |
637 | if (!NULL (w->hchild)) | |
638 | mark_window_display_accurate (w->hchild, flag); | |
639 | } | |
640 | ||
641 | if (flag) | |
642 | { | |
643 | last_arrow_position = Voverlay_arrow_position; | |
644 | last_arrow_string = Voverlay_arrow_string; | |
645 | } | |
646 | else | |
647 | { | |
648 | /* t is unequal to any useful value of Voverlay_arrow_... */ | |
649 | last_arrow_position = Qt; | |
650 | last_arrow_string = Qt; | |
651 | } | |
652 | } | |
653 | \f | |
654 | int do_id = 1; | |
655 | ||
656 | static void | |
657 | redisplay_windows (window) | |
658 | Lisp_Object window; | |
659 | { | |
660 | for (; !NULL (window); window = XWINDOW (window)->next) | |
661 | redisplay_window (window, 0); | |
662 | } | |
663 | ||
664 | static void | |
665 | redisplay_window (window, just_this_one) | |
666 | Lisp_Object window; | |
667 | int just_this_one; | |
668 | { | |
669 | register struct window *w = XWINDOW (window); | |
670 | SCREEN_PTR s = XSCREEN (w->screen); | |
671 | int height; | |
672 | register int lpoint = point; | |
673 | struct buffer *old = current_buffer; | |
674 | register int width = XFASTINT (w->width) - 1 | |
675 | - (XFASTINT (w->width) + XFASTINT (w->left) | |
676 | != SCREEN_WIDTH (XSCREEN (WINDOW_SCREEN (w)))); | |
677 | register int startp; | |
678 | register int hscroll = XINT (w->hscroll); | |
679 | struct position pos; | |
680 | int opoint; | |
681 | int tem; | |
682 | int window_needs_modeline; | |
683 | ||
684 | if (SCREEN_HEIGHT (s) == 0) abort (); /* Some bug zeros some core */ | |
685 | ||
686 | /* If this is a combination window, do its children; that's all. */ | |
687 | ||
688 | if (!NULL (w->vchild)) | |
689 | { | |
690 | redisplay_windows (w->vchild); | |
691 | return; | |
692 | } | |
693 | if (!NULL (w->hchild)) | |
694 | { | |
695 | redisplay_windows (w->hchild); | |
696 | return; | |
697 | } | |
698 | if (NULL (w->buffer)) | |
699 | abort (); | |
700 | ||
701 | if (update_mode_lines) | |
702 | w->update_mode_line = Qt; | |
703 | ||
704 | /* Otherwise set up data on this window; select its buffer and point value */ | |
705 | ||
706 | height = window_internal_height (w); | |
707 | ||
708 | if (MINI_WINDOW_P (w) | |
709 | && (echo_area_glyphs | |
710 | /* Don't display minibuffers except minibuf_window. */ | |
711 | || w != XWINDOW (minibuf_window))) | |
712 | return; | |
713 | ||
714 | current_buffer = XBUFFER (w->buffer); | |
715 | opoint = point; | |
716 | ||
717 | /* Count number of windows showing the selected buffer. */ | |
718 | ||
719 | if (!just_this_one | |
720 | && current_buffer == XBUFFER (XWINDOW (selected_window)->buffer)) | |
721 | buffer_shared++; | |
722 | ||
723 | /* POINT refers normally to the selected window. | |
724 | For any other window, set up appropriate value. */ | |
725 | ||
726 | if (!EQ (window, selected_window)) | |
727 | { | |
728 | SET_PT (marker_position (w->pointm)); | |
729 | if (point < BEGV) | |
730 | { | |
731 | point = BEGV; | |
732 | Fset_marker (w->pointm, make_number (point), Qnil); | |
733 | } | |
734 | else if (point > (ZV - 1)) | |
735 | { | |
736 | point = ZV; | |
737 | Fset_marker (w->pointm, make_number (point), Qnil); | |
738 | } | |
739 | } | |
740 | ||
741 | /* If window-start is screwed up, choose a new one. */ | |
742 | ||
743 | if (XMARKER (w->start)->buffer != current_buffer) | |
744 | goto recenter; | |
745 | ||
746 | startp = marker_position (w->start); | |
747 | ||
748 | /* Handle case where place to start displaying has been specified */ | |
749 | ||
750 | if (!NULL (w->force_start)) | |
751 | { | |
752 | w->update_mode_line = Qt; | |
753 | w->force_start = Qnil; | |
754 | XFASTINT (w->last_modified) = 0; | |
755 | try_window (window, startp); | |
756 | if (cursor_vpos < 0) | |
757 | { | |
758 | /* If point does not appear, move point so it does appear */ | |
759 | pos = *compute_motion (startp, 0, | |
760 | ((EQ (window, minibuf_window) && startp == 1) | |
761 | ? minibuf_prompt_width : 0) | |
762 | + | |
763 | (hscroll ? 1 - hscroll : 0), | |
764 | ZV, height / 2, | |
765 | - (1 << (SHORTBITS - 1)), | |
766 | width, hscroll, pos_tab_offset (w, startp)); | |
767 | SET_PT (pos.bufpos); | |
768 | if (w != XWINDOW (SCREEN_SELECTED_WINDOW (s))) | |
769 | Fset_marker (w->pointm, make_number (point), Qnil); | |
770 | else | |
771 | { | |
772 | lpoint = point; | |
773 | SCREEN_CURSOR_X (s) = max (0, pos.hpos) + XFASTINT (w->left); | |
774 | SCREEN_CURSOR_Y (s) = pos.vpos + XFASTINT (w->top); | |
775 | } | |
776 | } | |
777 | goto done; | |
778 | } | |
779 | ||
780 | /* Handle case where text has not changed, only point, | |
781 | and it has not moved off the screen */ | |
782 | ||
783 | /* This code is not used for minibuffer for the sake of | |
784 | the case of redisplaying to replace an echo area message; | |
785 | since in that case the minibuffer contents per se are usually unchanged. | |
786 | This code is of no real use in the minibuffer since | |
787 | the handling of this_line_bufpos, etc., | |
788 | in redisplay handles the same cases. */ | |
789 | ||
790 | if (XFASTINT (w->last_modified) >= MODIFF | |
791 | && point >= startp && !clip_changed | |
792 | && (just_this_one || XFASTINT (w->width) == SCREEN_WIDTH (s)) | |
793 | && !EQ (window, minibuf_window)) | |
794 | { | |
795 | pos = *compute_motion (startp, 0, (hscroll ? 1 - hscroll : 0), | |
796 | point, height + 1, 10000, width, hscroll, | |
797 | pos_tab_offset (w, startp)); | |
798 | ||
799 | if (pos.vpos < height) | |
800 | { | |
801 | /* Ok, point is still on screen */ | |
802 | if (w == XWINDOW (SCREEN_SELECTED_WINDOW (s))) | |
803 | { | |
804 | /* These variables are supposed to be origin 1 */ | |
805 | SCREEN_CURSOR_X (s) = max (0, pos.hpos) + XFASTINT (w->left); | |
806 | SCREEN_CURSOR_Y (s) = pos.vpos + XFASTINT (w->top); | |
807 | } | |
808 | /* This doesn't do the trick, because if a window to the right of | |
809 | this one must be redisplayed, this does nothing because there | |
810 | is nothing in DesiredScreen yet, and then the other window is | |
811 | redisplayed, making likes that are empty in this window's columns. | |
812 | if (XFASTINT (w->width) != SCREEN_WIDTH (s)) | |
813 | preserve_my_columns (w); | |
814 | */ | |
815 | goto done; | |
816 | } | |
817 | /* Don't bother trying redisplay with same start; | |
818 | we already know it will lose */ | |
819 | } | |
820 | /* If current starting point was originally the beginning of a line | |
821 | but no longer is, find a new starting point. */ | |
822 | else if (!NULL (w->start_at_line_beg) | |
823 | && !(startp == BEGV | |
824 | || FETCH_CHAR (startp - 1) == '\n')) | |
825 | { | |
826 | goto recenter; | |
827 | } | |
828 | else if (just_this_one && !MINI_WINDOW_P (w) | |
829 | && point >= startp | |
830 | && XFASTINT (w->last_modified) | |
831 | && ! EQ (w->window_end_valid, Qnil) | |
832 | && do_id && !clip_changed | |
833 | && !blank_end_of_window | |
834 | && XFASTINT (w->width) == SCREEN_WIDTH (s) | |
835 | && EQ (last_arrow_position, Voverlay_arrow_position) | |
836 | && EQ (last_arrow_string, Voverlay_arrow_string) | |
837 | && (tem = try_window_id (SCREEN_SELECTED_WINDOW (s))) | |
838 | && tem != -2) | |
839 | { | |
840 | /* tem > 0 means success. tem == -1 means choose new start. | |
841 | tem == -2 means try again with same start, | |
842 | and nothing but whitespace follows the changed stuff. | |
843 | tem == 0 means try again with same start. */ | |
844 | if (tem > 0) | |
845 | goto done; | |
846 | } | |
847 | else if (startp >= BEGV && startp <= ZV | |
848 | /* Avoid starting display at end of buffer! */ | |
849 | && (startp <= ZV || startp == BEGV | |
850 | || (XFASTINT (w->last_modified) >= MODIFF))) | |
851 | { | |
852 | /* Try to redisplay starting at same place as before */ | |
853 | /* If point has not moved off screen, accept the results */ | |
854 | try_window (window, startp); | |
855 | if (cursor_vpos >= 0) | |
856 | goto done; | |
857 | else | |
858 | cancel_my_columns (w); | |
859 | } | |
860 | ||
861 | XFASTINT (w->last_modified) = 0; | |
862 | w->update_mode_line = Qt; | |
863 | ||
864 | /* Try to scroll by specified few lines */ | |
865 | ||
866 | if (scroll_step && !clip_changed) | |
867 | { | |
868 | if (point > startp) | |
869 | { | |
870 | pos = *vmotion (Z - XFASTINT (w->window_end_pos), | |
871 | scroll_step, width, hscroll, window); | |
872 | if (pos.vpos >= height) | |
873 | goto scroll_fail; | |
874 | } | |
875 | ||
876 | pos = *vmotion (startp, point < startp ? - scroll_step : scroll_step, | |
877 | width, hscroll, window); | |
878 | ||
879 | if (point >= pos.bufpos) | |
880 | { | |
881 | try_window (window, pos.bufpos); | |
882 | if (cursor_vpos >= 0) | |
883 | goto done; | |
884 | else | |
885 | cancel_my_columns (w); | |
886 | } | |
887 | scroll_fail: ; | |
888 | } | |
889 | ||
890 | /* Finally, just choose place to start which centers point */ | |
891 | ||
892 | recenter: | |
893 | pos = *vmotion (point, - height / 2, width, hscroll, window); | |
894 | try_window (window, pos.bufpos); | |
895 | ||
896 | startp = marker_position (w->start); | |
897 | w->start_at_line_beg = | |
898 | (startp == BEGV || FETCH_CHAR (startp - 1) == '\n') ? Qt : Qnil; | |
899 | ||
900 | done: | |
901 | /* If window not full width, must redo its mode line | |
902 | if the window to its side is being redone */ | |
903 | if ((!NULL (w->update_mode_line) | |
904 | || (!just_this_one && width < SCREEN_WIDTH (s) - 1)) | |
905 | && height != XFASTINT (w->height)) | |
906 | display_mode_line (w); | |
907 | ||
908 | SET_PT (opoint); | |
909 | current_buffer = old; | |
910 | SET_PT (lpoint); | |
911 | } | |
912 | \f | |
913 | /* Do full redisplay on one window, starting at position `pos'. */ | |
914 | ||
915 | static void | |
916 | try_window (window, pos) | |
917 | Lisp_Object window; | |
918 | register int pos; | |
919 | { | |
920 | register struct window *w = XWINDOW (window); | |
921 | register int height = window_internal_height (w); | |
922 | register int vpos = XFASTINT (w->top); | |
923 | register int last_text_vpos = vpos; | |
924 | int tab_offset = pos_tab_offset (w, pos); | |
925 | SCREEN_PTR s = XSCREEN (w->screen); | |
926 | int width = XFASTINT (w->width) - 1 | |
927 | - (XFASTINT (w->width) + XFASTINT (w->left) != SCREEN_WIDTH (s)); | |
928 | struct position val; | |
929 | ||
930 | Fset_marker (w->start, make_number (pos), Qnil); | |
931 | cursor_vpos = -1; | |
932 | overlay_arrow_seen = 0; | |
933 | val.hpos = XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0; | |
934 | ||
935 | while (--height >= 0) | |
936 | { | |
937 | val = *display_text_line (w, pos, vpos, val.hpos, tab_offset); | |
938 | tab_offset += width; | |
939 | if (val.vpos) tab_offset = 0; | |
940 | vpos++; | |
941 | if (pos != val.bufpos) | |
942 | last_text_vpos | |
943 | /* Next line, unless prev line ended in end of buffer with no cr */ | |
944 | = vpos - (val.vpos && FETCH_CHAR (val.bufpos - 1) != '\n'); | |
945 | pos = val.bufpos; | |
946 | } | |
947 | ||
948 | /* If last line is continued in middle of character, | |
949 | include the split character in the text considered on the screen */ | |
950 | if (val.hpos < (XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0)) | |
951 | pos++; | |
952 | ||
953 | /* If bottom just moved off end of screen, change mode line percentage. */ | |
954 | if (XFASTINT (w->window_end_pos) == 0 | |
955 | && Z != pos) | |
956 | w->update_mode_line = Qt; | |
957 | ||
958 | /* Say where last char on screen will be, once redisplay is finished. */ | |
959 | XFASTINT (w->window_end_pos) = Z - pos; | |
960 | XFASTINT (w->window_end_vpos) = last_text_vpos - XFASTINT (w->top); | |
961 | /* But that is not valid info until redisplay finishes. */ | |
962 | w->window_end_valid = Qnil; | |
963 | } | |
964 | \f | |
965 | /* Try to redisplay when buffer is modified locally, | |
966 | computing insert/delete line to preserve text outside | |
967 | the bounds of the changes. | |
968 | Return 1 if successful, 0 if if cannot tell what to do, | |
969 | or -1 to tell caller to find a new window start, | |
970 | or -2 to tell caller to do normal redisplay with same window start. */ | |
971 | ||
972 | static int | |
973 | try_window_id (window) | |
974 | Lisp_Object window; | |
975 | { | |
976 | int pos; | |
977 | register struct window *w = XWINDOW (window); | |
978 | register int height = window_internal_height (w); | |
979 | SCREEN_PTR s = XSCREEN (w->screen); | |
980 | int top = XFASTINT (w->top); | |
981 | int start = marker_position (w->start); | |
982 | int width = XFASTINT (w->width) - 1 | |
983 | - (XFASTINT (w->width) + XFASTINT (w->left) != SCREEN_WIDTH (s)); | |
984 | int hscroll = XINT (w->hscroll); | |
985 | int lmargin = hscroll > 0 ? 1 - hscroll : 0; | |
986 | register int vpos; | |
987 | register int i, tem; | |
988 | int last_text_vpos = 0; | |
989 | int stop_vpos; | |
990 | ||
991 | struct position val, bp, ep, xp, pp; | |
992 | int scroll_amount = 0; | |
993 | int delta; | |
994 | int tab_offset, epto; | |
995 | ||
996 | if (GPT - BEG < beg_unchanged) | |
997 | beg_unchanged = GPT - BEG; | |
998 | if (Z - GPT < end_unchanged) | |
999 | end_unchanged = Z - GPT; | |
1000 | ||
1001 | if (beg_unchanged + 1 < start) | |
1002 | return 0; /* Give up if changes go above top of window */ | |
1003 | ||
1004 | /* Find position before which nothing is changed. */ | |
1005 | bp = *compute_motion (start, 0, lmargin, | |
1006 | beg_unchanged + 1, 10000, 10000, width, hscroll, | |
1007 | pos_tab_offset (w, start)); | |
1008 | if (bp.vpos >= height) | |
1009 | return point < bp.bufpos && !bp.contin; | |
1010 | ||
1011 | vpos = bp.vpos; | |
1012 | ||
1013 | /* Find beginning of that screen line. Must display from there. */ | |
1014 | bp = *vmotion (bp.bufpos, 0, width, hscroll, window); | |
1015 | ||
1016 | pos = bp.bufpos; | |
1017 | val.hpos = lmargin; | |
1018 | if (pos < start) | |
1019 | return -1; | |
1020 | ||
1021 | /* If about to start displaying at the beginning of a continuation line, | |
1022 | really start with previous screen line, in case it was not | |
1023 | continued when last redisplayed */ | |
1024 | if (bp.contin && bp.bufpos - 1 == beg_unchanged && vpos > 0) | |
1025 | { | |
1026 | bp = *vmotion (bp.bufpos, -1, width, hscroll, window); | |
1027 | --vpos; | |
1028 | pos = bp.bufpos; | |
1029 | } | |
1030 | ||
1031 | if (bp.contin && bp.hpos != lmargin) | |
1032 | { | |
1033 | val.hpos = bp.prevhpos - width + lmargin; | |
1034 | pos--; | |
1035 | } | |
1036 | ||
1037 | bp.vpos = vpos; | |
1038 | ||
1039 | /* Find first visible newline after which no more is changed. */ | |
1040 | tem = find_next_newline (Z - max (end_unchanged, Z - ZV), 1); | |
1041 | if (XTYPE (current_buffer->selective_display) == Lisp_Int | |
1042 | && XINT (current_buffer->selective_display) > 0) | |
1043 | while (tem < ZV - 1 | |
1044 | && (position_indentation (tem) | |
1045 | >= XINT (current_buffer->selective_display))) | |
1046 | tem = find_next_newline (tem, 1); | |
1047 | ||
1048 | /* Compute the cursor position after that newline. */ | |
1049 | ep = *compute_motion (pos, vpos, val.hpos, tem, | |
1050 | height, - (1 << (SHORTBITS - 1)), | |
1051 | width, hscroll, pos_tab_offset (w, bp.bufpos)); | |
1052 | ||
1053 | /* If changes reach past the text available on the screen, | |
1054 | just display rest of screen. */ | |
1055 | if (ep.bufpos > Z - XFASTINT (w->window_end_pos)) | |
1056 | stop_vpos = height; | |
1057 | else | |
1058 | stop_vpos = ep.vpos; | |
1059 | ||
1060 | /* If no newline before ep, the line ep is on includes some changes | |
1061 | that must be displayed. Make sure we don't stop before it. */ | |
1062 | /* Also, if changes reach all the way until ep.bufpos, | |
1063 | it is possible that something was deleted after the | |
1064 | newline before it, so the following line must be redrawn. */ | |
1065 | if (stop_vpos == ep.vpos | |
1066 | && (ep.bufpos == BEGV | |
1067 | || FETCH_CHAR (ep.bufpos - 1) != '\n' | |
1068 | || ep.bufpos == Z - end_unchanged)) | |
1069 | stop_vpos = ep.vpos + 1; | |
1070 | ||
1071 | cursor_vpos = -1; | |
1072 | overlay_arrow_seen = 0; | |
1073 | ||
1074 | /* If changes do not reach to bottom of window, | |
1075 | figure out how much to scroll the rest of the window */ | |
1076 | if (stop_vpos < height) | |
1077 | { | |
1078 | /* Now determine how far up or down the rest of the window has moved */ | |
1079 | epto = pos_tab_offset (w, ep.bufpos); | |
1080 | xp = *compute_motion (ep.bufpos, ep.vpos, ep.hpos, | |
1081 | Z - XFASTINT (w->window_end_pos), | |
1082 | 10000, 0, width, hscroll, epto); | |
1083 | scroll_amount = xp.vpos - XFASTINT (w->window_end_vpos); | |
1084 | ||
1085 | /* Is everything on screen below the changes whitespace? | |
1086 | If so, no scrolling is really necessary. */ | |
1087 | for (i = ep.bufpos; i < xp.bufpos; i++) | |
1088 | { | |
1089 | tem = FETCH_CHAR (i); | |
1090 | if (tem != ' ' && tem != '\n' && tem != '\t') | |
1091 | break; | |
1092 | } | |
1093 | if (i == xp.bufpos) | |
1094 | return -2; | |
1095 | ||
1096 | XFASTINT (w->window_end_vpos) += scroll_amount; | |
1097 | ||
1098 | /* Before doing any scrolling, verify that point will be on screen. */ | |
1099 | if (point > ep.bufpos && !(point <= xp.bufpos && xp.bufpos < height)) | |
1100 | { | |
1101 | if (point <= xp.bufpos) | |
1102 | { | |
1103 | pp = *compute_motion (ep.bufpos, ep.vpos, ep.hpos, | |
1104 | point, height, - (1 << (SHORTBITS - 1)), | |
1105 | width, hscroll, epto); | |
1106 | } | |
1107 | else | |
1108 | { | |
1109 | pp = *compute_motion (xp.bufpos, xp.vpos, xp.hpos, | |
1110 | point, height, - (1 << (SHORTBITS - 1)), | |
1111 | width, hscroll, pos_tab_offset (w, xp.bufpos)); | |
1112 | } | |
1113 | if (pp.bufpos < point || pp.vpos == height) | |
1114 | return 0; | |
1115 | cursor_vpos = pp.vpos + top; | |
1116 | cursor_hpos = pp.hpos + XFASTINT (w->left); | |
1117 | } | |
1118 | ||
1119 | if (stop_vpos - scroll_amount >= height | |
1120 | || ep.bufpos == xp.bufpos) | |
1121 | { | |
1122 | if (scroll_amount < 0) | |
1123 | stop_vpos -= scroll_amount; | |
1124 | scroll_amount = 0; | |
1125 | /* In this path, we have altered window_end_vpos | |
1126 | and not left it negative. | |
1127 | We must make sure that, in case display is preempted | |
1128 | before the screen changes to reflect what we do here, | |
1129 | further updates will not come to try_window_id | |
1130 | and assume the screen and window_end_vpos match. */ | |
1131 | blank_end_of_window = 1; | |
1132 | } | |
1133 | else if (!scroll_amount) | |
1134 | {} | |
1135 | else if (bp.bufpos == Z - end_unchanged) | |
1136 | { | |
1137 | /* If reprinting everything is nearly as fast as scrolling, | |
1138 | don't bother scrolling. Can happen if lines are short. */ | |
1139 | if (scroll_cost (s, bp.vpos + top - scroll_amount, | |
1140 | top + height - max (0, scroll_amount), | |
1141 | scroll_amount) | |
1142 | > xp.bufpos - bp.bufpos - 20) | |
1143 | /* Return "try normal display with same window-start." | |
1144 | Too bad we can't prevent further scroll-thinking. */ | |
1145 | return -2; | |
1146 | /* If pure deletion, scroll up as many lines as possible. | |
1147 | In common case of killing a line, this can save the | |
1148 | following line from being overwritten by scrolling | |
1149 | and therefore having to be redrawn. */ | |
1150 | tem = scroll_screen_lines (s, bp.vpos + top - scroll_amount, | |
1151 | top + height - max (0, scroll_amount), | |
1152 | scroll_amount); | |
1153 | if (!tem) stop_vpos = height; | |
1154 | } | |
1155 | else if (scroll_amount) | |
1156 | { | |
1157 | /* If reprinting everything is nearly as fast as scrolling, | |
1158 | don't bother scrolling. Can happen if lines are short. */ | |
1159 | /* Note that if scroll_amount > 0, xp.bufpos - bp.bufpos is an | |
1160 | overestimate of cost of reprinting, since xp.bufpos | |
1161 | would end up below the bottom of the window. */ | |
1162 | if (scroll_cost (s, ep.vpos + top - scroll_amount, | |
1163 | top + height - max (0, scroll_amount), | |
1164 | scroll_amount) | |
1165 | > xp.bufpos - ep.bufpos - 20) | |
1166 | /* Return "try normal display with same window-start." | |
1167 | Too bad we can't prevent further scroll-thinking. */ | |
1168 | return -2; | |
1169 | tem = scroll_screen_lines (s, ep.vpos + top - scroll_amount, | |
1170 | top + height - max (0, scroll_amount), | |
1171 | scroll_amount); | |
1172 | if (!tem) stop_vpos = height; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* In any case, do not display past bottom of window */ | |
1177 | if (stop_vpos >= height) | |
1178 | { | |
1179 | stop_vpos = height; | |
1180 | scroll_amount = 0; | |
1181 | } | |
1182 | ||
1183 | /* Handle case where pos is before w->start -- | |
1184 | can happen if part of line had been clipped and is not clipped now */ | |
1185 | if (vpos == 0 && pos < marker_position (w->start)) | |
1186 | Fset_marker (w->start, make_number (pos), Qnil); | |
1187 | ||
1188 | /* Redisplay the lines where the text was changed */ | |
1189 | last_text_vpos = vpos; | |
1190 | tab_offset = pos_tab_offset (w, pos); | |
1191 | /* If we are starting display in mid-character, correct tab_offset | |
1192 | to account for passing the line that that character really starts in. */ | |
1193 | if (val.hpos < lmargin) | |
1194 | tab_offset += width; | |
1195 | while (vpos < stop_vpos) | |
1196 | { | |
1197 | val = *display_text_line (w, pos, top + vpos++, val.hpos, tab_offset); | |
1198 | tab_offset += width; | |
1199 | if (val.vpos) tab_offset = 0; | |
1200 | if (pos != val.bufpos) | |
1201 | last_text_vpos | |
1202 | /* Next line, unless prev line ended in end of buffer with no cr */ | |
1203 | = vpos - (val.vpos && FETCH_CHAR (val.bufpos - 1) != '\n'); | |
1204 | pos = val.bufpos; | |
1205 | } | |
1206 | ||
1207 | /* There are two cases: | |
1208 | 1) we have displayed down to the bottom of the window | |
1209 | 2) we have scrolled lines below stop_vpos by scroll_amount */ | |
1210 | ||
1211 | if (vpos == height) | |
1212 | { | |
1213 | /* If last line is continued in middle of character, | |
1214 | include the split character in the text considered on the screen */ | |
1215 | if (val.hpos < lmargin) | |
1216 | val.bufpos++; | |
1217 | XFASTINT (w->window_end_vpos) = last_text_vpos; | |
1218 | XFASTINT (w->window_end_pos) = Z - val.bufpos; | |
1219 | } | |
1220 | ||
1221 | /* If scrolling made blank lines at window bottom, | |
1222 | redisplay to fill those lines */ | |
1223 | if (scroll_amount < 0) | |
1224 | { | |
1225 | /* Don't consider these lines for general-purpose scrolling. | |
1226 | That will save time in the scrolling computation. */ | |
1227 | SCREEN_SCROLL_BOTTOM_VPOS (s) = xp.vpos; | |
1228 | vpos = xp.vpos; | |
1229 | pos = xp.bufpos; | |
1230 | val.hpos = lmargin; | |
1231 | if (pos == ZV) | |
1232 | vpos = height + scroll_amount; | |
1233 | else if (xp.contin && xp.hpos != lmargin) | |
1234 | { | |
1235 | val.hpos = xp.prevhpos - width + lmargin; | |
1236 | pos--; | |
1237 | } | |
1238 | ||
1239 | blank_end_of_window = 1; | |
1240 | tab_offset = pos_tab_offset (w, pos); | |
1241 | /* If we are starting display in mid-character, correct tab_offset | |
1242 | to account for passing the line that that character starts in. */ | |
1243 | if (val.hpos < lmargin) | |
1244 | tab_offset += width; | |
1245 | ||
1246 | while (vpos < height) | |
1247 | { | |
1248 | val = *display_text_line (w, pos, top + vpos++, val.hpos, tab_offset); | |
1249 | tab_offset += width; | |
1250 | if (val.vpos) tab_offset = 0; | |
1251 | pos = val.bufpos; | |
1252 | } | |
1253 | ||
1254 | /* Here is a case where display_text_line sets cursor_vpos wrong. | |
1255 | Make it be fixed up, below. */ | |
1256 | if (xp.bufpos == ZV | |
1257 | && xp.bufpos == point) | |
1258 | cursor_vpos = -1; | |
1259 | } | |
1260 | ||
1261 | /* If bottom just moved off end of screen, change mode line percentage. */ | |
1262 | if (XFASTINT (w->window_end_pos) == 0 | |
1263 | && Z != val.bufpos) | |
1264 | w->update_mode_line = Qt; | |
1265 | ||
1266 | /* Attempt to adjust end-of-text positions to new bottom line */ | |
1267 | if (scroll_amount) | |
1268 | { | |
1269 | delta = height - xp.vpos; | |
1270 | if (delta < 0 | |
1271 | || (delta > 0 && xp.bufpos <= ZV) | |
1272 | || (delta == 0 && xp.hpos)) | |
1273 | { | |
1274 | val = *vmotion (Z - XFASTINT (w->window_end_pos), | |
1275 | delta, width, hscroll, window); | |
1276 | XFASTINT (w->window_end_pos) = Z - val.bufpos; | |
1277 | XFASTINT (w->window_end_vpos) += val.vpos; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | w->window_end_valid = Qnil; | |
1282 | ||
1283 | /* If point was not in a line that was displayed, find it */ | |
1284 | if (cursor_vpos < 0) | |
1285 | { | |
1286 | val = *compute_motion (start, 0, lmargin, point, 10000, 10000, | |
1287 | width, hscroll, pos_tab_offset (w, start)); | |
1288 | /* Admit failure if point is off screen now */ | |
1289 | if (val.vpos >= height) | |
1290 | { | |
1291 | for (vpos = 0; vpos < height; vpos++) | |
1292 | cancel_line (vpos + top, s); | |
1293 | return 0; | |
1294 | } | |
1295 | cursor_vpos = val.vpos + top; | |
1296 | cursor_hpos = val.hpos + XFASTINT (w->left); | |
1297 | } | |
1298 | ||
1299 | SCREEN_CURSOR_X (s) = max (0, cursor_hpos); | |
1300 | SCREEN_CURSOR_Y (s) = cursor_vpos; | |
1301 | ||
1302 | if (debug_end_pos) | |
1303 | { | |
1304 | val = *compute_motion (start, 0, lmargin, ZV, | |
1305 | height, - (1 << (SHORTBITS - 1)), | |
1306 | width, hscroll, pos_tab_offset (w, start)); | |
1307 | if (val.vpos != XFASTINT (w->window_end_vpos)) | |
1308 | abort (); | |
1309 | if (XFASTINT (w->window_end_pos) | |
1310 | != Z - val.bufpos) | |
1311 | abort (); | |
1312 | } | |
1313 | ||
1314 | return 1; | |
1315 | } | |
1316 | \f | |
f7430cb6 JB |
1317 | /* Copy glyphs from the rope FROM to T. |
1318 | But don't actually copy the parts that would come in before S. | |
a2889657 JB |
1319 | Value is T, advanced past the copied data. |
1320 | ||
1321 | Characters in FROM are grouped into units of `sizeof GLYPH' chars; | |
1322 | any extra chars at the end of FROM are ignored. */ | |
1323 | ||
1324 | GLYPH * | |
1325 | copy_rope (t, s, from) | |
1326 | register GLYPH *t; /* Copy to here. */ | |
1327 | register GLYPH *s; /* Starting point. */ | |
1328 | Lisp_Object from; /* Data to copy; known to be a string. */ | |
1329 | { | |
1330 | register int n = XSTRING (from)->size / sizeof (GLYPH); | |
1331 | register GLYPH *f = (GLYPH *) XSTRING (from)->data; | |
1332 | ||
1333 | while (n--) | |
1334 | { | |
1335 | if (t >= s) *t = *f; | |
1336 | ++t; | |
1337 | ++f; | |
1338 | } | |
1339 | return t; | |
1340 | } | |
1341 | \f | |
1342 | /* Display one line of window w, starting at position START in W's buffer. | |
1343 | Display starting at horizontal position HPOS, which is normally zero | |
1344 | or negative. A negative value causes output up to hpos = 0 to be discarded. | |
1345 | This is done for negative hscroll, or when this is a continuation line | |
1346 | and the continuation occurred in the middle of a multi-column character. | |
1347 | ||
1348 | TABOFFSET is an offset for ostensible hpos, used in tab stop calculations. | |
1349 | ||
1350 | Display on position VPOS on the screen. (origin 0). | |
1351 | ||
1352 | Returns a STRUCT POSITION giving character to start next line with | |
1353 | and where to display it, including a zero or negative hpos. | |
1354 | The vpos field is not really a vpos; it is 1 unless the line is continued */ | |
1355 | ||
1356 | struct position val_display_text_line; | |
1357 | ||
1358 | static struct position * | |
1359 | display_text_line (w, start, vpos, hpos, taboffset) | |
1360 | struct window *w; | |
1361 | int start; | |
1362 | int vpos; | |
1363 | int hpos; | |
1364 | int taboffset; | |
1365 | { | |
1366 | register int pos = start; | |
1367 | register int c; | |
1368 | register GLYPH *p1; | |
1369 | int end; | |
1370 | register int pause; | |
1371 | register unsigned char *p; | |
1372 | GLYPH *endp; | |
1373 | register GLYPH *startp; | |
1374 | register GLYPH *p1prev; | |
1375 | SCREEN_PTR s = XSCREEN (w->screen); | |
1376 | int tab_width = XINT (current_buffer->tab_width); | |
1377 | int ctl_arrow = !NULL (current_buffer->ctl_arrow); | |
1378 | int width = XFASTINT (w->width) - 1 | |
1379 | - (XFASTINT (w->width) + XFASTINT (w->left) != SCREEN_WIDTH (s)); | |
1380 | struct position val; | |
1381 | int lastpos; | |
1382 | int invis; | |
1383 | int hscroll = XINT (w->hscroll); | |
1384 | int truncate = hscroll | |
1385 | || (truncate_partial_width_windows | |
1386 | && XFASTINT (w->width) < SCREEN_WIDTH (s)) | |
1387 | || !NULL (current_buffer->truncate_lines); | |
1388 | int selective | |
1389 | = XTYPE (current_buffer->selective_display) == Lisp_Int | |
1390 | ? XINT (current_buffer->selective_display) | |
1391 | : !NULL (current_buffer->selective_display) ? -1 : 0; | |
1392 | #ifndef old | |
1393 | int selective_e = selective && !NULL (current_buffer->selective_display_ellipses); | |
1394 | #endif | |
1395 | register struct screen_glyphs *desired_glyphs = SCREEN_DESIRED_GLYPHS (s); | |
1396 | register struct Lisp_Vector *dp = window_display_table (w); | |
1397 | int selective_rlen | |
1398 | = (selective && dp && XTYPE (DISP_INVIS_ROPE (dp)) == Lisp_String | |
1399 | ? XSTRING (DISP_INVIS_ROPE (dp))->size / sizeof (GLYPH) : 0); | |
1400 | GLYPH truncator = (dp == 0 || XTYPE (DISP_TRUNC_GLYPH (dp)) != Lisp_Int | |
1401 | ? '$' : XINT (DISP_TRUNC_GLYPH (dp))); | |
1402 | GLYPH continuer = (dp == 0 || XTYPE (DISP_CONTINUE_GLYPH (dp)) != Lisp_Int | |
1403 | ? '\\' : XINT (DISP_CONTINUE_GLYPH (dp))); | |
1404 | ||
1405 | hpos += XFASTINT (w->left); | |
1406 | get_display_line (s, vpos, XFASTINT (w->left)); | |
1407 | if (tab_width <= 0 || tab_width > 20) tab_width = 8; | |
1408 | ||
1409 | if (MINI_WINDOW_P (w) && start == 1 | |
1410 | && vpos == XFASTINT (w->top)) | |
1411 | { | |
1412 | if (minibuf_prompt) | |
1413 | hpos = display_string (w, vpos, minibuf_prompt, hpos, | |
1414 | (!truncate ? continuer : truncator), | |
1415 | -1, -1); | |
1416 | minibuf_prompt_width = hpos; | |
1417 | } | |
1418 | ||
1419 | desired_glyphs->bufp[vpos] = pos; | |
1420 | p1 = desired_glyphs->glyphs[vpos] + hpos; | |
1421 | end = ZV; | |
1422 | startp = desired_glyphs->glyphs[vpos] + XFASTINT (w->left); | |
1423 | endp = startp + width; | |
1424 | ||
1425 | /* Loop generating characters. | |
1426 | Stop at end of buffer, before newline, | |
1427 | or if reach or pass continuation column. */ | |
1428 | ||
1429 | pause = pos; | |
1430 | while (p1 < endp) | |
1431 | { | |
1432 | p1prev = p1; | |
1433 | if (pos == pause) | |
1434 | { | |
1435 | if (pos == end) | |
1436 | break; | |
1437 | if (pos == point && cursor_vpos < 0) | |
1438 | { | |
1439 | cursor_vpos = vpos; | |
1440 | cursor_hpos = p1 - startp; | |
1441 | } | |
1442 | ||
1443 | pause = end; | |
1444 | if (pos < point && point < pause) | |
1445 | pause = point; | |
1446 | if (pos < GPT && GPT < pause) | |
1447 | pause = GPT; | |
1448 | ||
1449 | p = &FETCH_CHAR (pos); | |
1450 | } | |
1451 | c = *p++; | |
1452 | if (c >= 040 && c < 0177 | |
1453 | && (dp == 0 || XTYPE (DISP_CHAR_ROPE (dp, c)) != Lisp_String)) | |
1454 | { | |
1455 | if (p1 >= startp) | |
1456 | *p1 = c; | |
1457 | p1++; | |
1458 | } | |
1459 | else if (c == '\n') | |
1460 | { | |
1461 | invis = 0; | |
1462 | while (pos < end | |
1463 | && selective > 0 | |
1464 | && position_indentation (pos + 1) >= selective) | |
1465 | { | |
1466 | invis = 1; | |
1467 | pos = find_next_newline (pos + 1, 1); | |
1468 | if (FETCH_CHAR (pos - 1) == '\n') | |
1469 | pos--; | |
1470 | } | |
1471 | if (invis && selective_rlen > 0 && p1 >= startp) | |
1472 | { | |
1473 | p1 += selective_rlen; | |
1474 | if (p1 - startp > width) | |
1475 | p1 = endp; | |
1476 | bcopy (XSTRING (DISP_INVIS_ROPE (dp))->data, p1prev, | |
1477 | (p1 - p1prev) * sizeof (GLYPH)); | |
1478 | } | |
1479 | break; | |
1480 | } | |
1481 | else if (c == '\t') | |
1482 | { | |
1483 | do | |
1484 | { | |
1485 | if (p1 >= startp && p1 < endp) | |
1486 | *p1 = SPACEGLYPH; | |
1487 | p1++; | |
1488 | } | |
1489 | while ((p1 - startp + taboffset + hscroll - (hscroll > 0)) | |
1490 | % tab_width); | |
1491 | } | |
1492 | else if (c == Ctl('M') && selective == -1) | |
1493 | { | |
1494 | pos = find_next_newline (pos, 1); | |
1495 | if (FETCH_CHAR (pos - 1) == '\n') | |
1496 | pos--; | |
1497 | if (selective_rlen > 0) | |
1498 | { | |
1499 | p1 += selective_rlen; | |
1500 | if (p1 - startp > width) | |
1501 | p1 = endp; | |
1502 | bcopy (XSTRING (DISP_INVIS_ROPE (dp))->data, p1prev, | |
1503 | (p1 - p1prev) * sizeof (GLYPH)); | |
1504 | } | |
1505 | break; | |
1506 | } | |
1507 | else if (dp != 0 && XTYPE (DISP_CHAR_ROPE (dp, c)) == Lisp_String) | |
1508 | { | |
1509 | p1 = copy_rope (p1, startp, DISP_CHAR_ROPE (dp, c)); | |
1510 | } | |
1511 | else if (c < 0200 && ctl_arrow) | |
1512 | { | |
1513 | if (p1 >= startp) | |
1514 | *p1 = (dp && XTYPE (DISP_CTRL_GLYPH (dp)) == Lisp_Int | |
1515 | ? XINT (DISP_CTRL_GLYPH (dp)) : '^'); | |
1516 | p1++; | |
1517 | if (p1 >= startp) | |
1518 | *p1 = c ^ 0100; | |
1519 | p1++; | |
1520 | } | |
1521 | else | |
1522 | { | |
1523 | if (p1 >= startp) | |
1524 | *p1 = (dp && XTYPE (DISP_ESCAPE_GLYPH (dp)) == Lisp_Int | |
1525 | ? XINT (DISP_ESCAPE_GLYPH (dp)) : '\\'); | |
1526 | p1++; | |
1527 | if (p1 >= startp) | |
1528 | *p1 = (c >> 6) + '0'; | |
1529 | p1++; | |
1530 | if (p1 >= startp) | |
1531 | *p1 = (7 & (c >> 3)) + '0'; | |
1532 | p1++; | |
1533 | if (p1 >= startp) | |
1534 | *p1 = (7 & c) + '0'; | |
1535 | p1++; | |
1536 | } | |
1537 | pos++; | |
1538 | } | |
1539 | ||
1540 | val.hpos = - XINT (w->hscroll); | |
1541 | if (val.hpos) | |
1542 | val.hpos++; | |
1543 | ||
1544 | val.vpos = 1; | |
1545 | ||
1546 | lastpos = pos; | |
1547 | ||
1548 | /* Handle continuation in middle of a character */ | |
1549 | /* by backing up over it */ | |
1550 | if (p1 > endp) | |
1551 | { | |
1552 | /* Start the next line with that same character */ | |
1553 | pos--; | |
1554 | /* but at a negative hpos, to skip the columns output on this line. */ | |
1555 | val.hpos += p1prev - endp; | |
1556 | /* Keep in this line everything up to the continuation column. */ | |
1557 | p1 = endp; | |
1558 | } | |
1559 | ||
1560 | /* Finish deciding which character to start the next line on, | |
1561 | and what hpos to start it at. | |
1562 | Also set `lastpos' to the last position which counts as "on this line" | |
1563 | for cursor-positioning. */ | |
1564 | ||
1565 | if (pos < ZV) | |
1566 | { | |
1567 | if (FETCH_CHAR (pos) == '\n') | |
1568 | /* If stopped due to a newline, start next line after it */ | |
1569 | pos++; | |
1570 | else | |
1571 | /* Stopped due to right margin of window */ | |
1572 | { | |
1573 | if (truncate) | |
1574 | { | |
1575 | *p1++ = truncator; | |
1576 | /* Truncating => start next line after next newline, | |
1577 | and point is on this line if it is before the newline, | |
1578 | and skip none of first char of next line */ | |
1579 | pos = find_next_newline (pos, 1); | |
1580 | val.hpos = XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0; | |
1581 | ||
1582 | lastpos = pos - (FETCH_CHAR (pos - 1) == '\n'); | |
1583 | } | |
1584 | else | |
1585 | { | |
1586 | *p1++ = continuer; | |
1587 | val.vpos = 0; | |
1588 | lastpos--; | |
1589 | } | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | /* If point is at eol or in invisible text at eol, | |
1594 | record its screen location now. */ | |
1595 | ||
1596 | if (start <= point && point <= lastpos && cursor_vpos < 0) | |
1597 | { | |
1598 | cursor_vpos = vpos; | |
1599 | cursor_hpos = p1 - startp; | |
1600 | } | |
1601 | ||
1602 | if (cursor_vpos == vpos) | |
1603 | { | |
1604 | if (cursor_hpos < 0) cursor_hpos = 0; | |
1605 | if (cursor_hpos > width) cursor_hpos = width; | |
1606 | cursor_hpos += XFASTINT (w->left); | |
1607 | if (w == XWINDOW (SCREEN_SELECTED_WINDOW (s))) | |
1608 | { | |
1609 | SCREEN_CURSOR_Y (s) = cursor_vpos; | |
1610 | SCREEN_CURSOR_X (s) = cursor_hpos; | |
1611 | ||
1612 | if (w == XWINDOW (selected_window)) | |
1613 | { | |
1614 | /* Line is not continued and did not start | |
1615 | in middle of character */ | |
1616 | if ((hpos - XFASTINT (w->left) | |
1617 | == (XINT (w->hscroll) ? 1 - XINT (w->hscroll) : 0)) | |
1618 | && val.vpos) | |
1619 | { | |
1620 | this_line_bufpos = start; | |
1621 | this_line_buffer = current_buffer; | |
1622 | this_line_vpos = cursor_vpos; | |
1623 | this_line_start_hpos = hpos; | |
1624 | this_line_endpos = Z - lastpos; | |
1625 | } | |
1626 | else | |
1627 | this_line_bufpos = 0; | |
1628 | } | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | /* If hscroll and line not empty, insert truncation-at-left marker */ | |
1633 | if (hscroll && lastpos != start) | |
1634 | { | |
1635 | *startp = truncator; | |
1636 | if (p1 <= startp) | |
1637 | p1 = startp + 1; | |
1638 | } | |
1639 | ||
1640 | if (XFASTINT (w->width) + XFASTINT (w->left) != SCREEN_WIDTH (s)) | |
1641 | { | |
1642 | endp++; | |
1643 | if (p1 < startp) p1 = startp; | |
1644 | while (p1 < endp) *p1++ = SPACEGLYPH; | |
1645 | *p1++ = '|'; | |
1646 | } | |
1647 | desired_glyphs->used[vpos] = max (desired_glyphs->used[vpos], | |
1648 | p1 - desired_glyphs->glyphs[vpos]); | |
1649 | desired_glyphs->glyphs[vpos][desired_glyphs->used[vpos]] = 0; | |
1650 | ||
1651 | /* If the start of this line is the overlay arrow-position, | |
1652 | then put the arrow string into the display-line. */ | |
1653 | ||
1654 | if (XTYPE (Voverlay_arrow_position) == Lisp_Marker | |
1655 | && current_buffer == XMARKER (Voverlay_arrow_position)->buffer | |
1656 | && start == marker_position (Voverlay_arrow_position) | |
1657 | && XTYPE (Voverlay_arrow_string) == Lisp_String | |
1658 | && ! overlay_arrow_seen) | |
1659 | { | |
1660 | unsigned char *p = XSTRING (Voverlay_arrow_string)->data; | |
1661 | int i; | |
1662 | int len = XSTRING (Voverlay_arrow_string)->size; | |
1663 | ||
1664 | if (len > XFASTINT (w->width) - 1) | |
1665 | len = XFASTINT (w->width) - 1; | |
1666 | for (i = 0; i < len; i++) | |
1667 | startp[i] = p[i]; | |
1668 | if (desired_glyphs->used[vpos] < | |
1669 | (len + startp - desired_glyphs->glyphs[vpos])) | |
1670 | desired_glyphs->used[vpos] = len + startp - desired_glyphs->glyphs[vpos]; | |
1671 | ||
1672 | overlay_arrow_seen = 1; | |
1673 | } | |
1674 | ||
1675 | val.bufpos = pos; | |
1676 | val_display_text_line = val; | |
1677 | return &val_display_text_line; | |
1678 | } | |
1679 | \f | |
1680 | /* Display the mode line for window w */ | |
1681 | ||
1682 | static void | |
1683 | display_mode_line (w) | |
1684 | struct window *w; | |
1685 | { | |
1686 | register int vpos = XFASTINT (w->height) + XFASTINT (w->top) - 1; | |
1687 | register int left = XFASTINT (w->left); | |
1688 | register int right = XFASTINT (w->width) + left; | |
1689 | register SCREEN_PTR s = XSCREEN (WINDOW_SCREEN (w)); | |
1690 | ||
1691 | get_display_line (s, vpos, left); | |
1692 | display_mode_element (w, vpos, left, 0, right, right, | |
1693 | current_buffer->mode_line_format); | |
1694 | SCREEN_DESIRED_GLYPHS (s)->bufp[vpos] = 0; | |
1695 | ||
1696 | /* Make the mode line inverse video if the entire line | |
1697 | is made of mode lines. | |
1698 | I.e. if this window is full width, | |
1699 | or if it is the child of a full width window | |
1700 | (which implies that that window is split side-by-side | |
1701 | and the rest of this line is mode lines of the sibling windows). */ | |
1702 | if (XFASTINT (w->width) == SCREEN_WIDTH (s) | |
1703 | || XFASTINT (XWINDOW (w->parent)->width) == SCREEN_WIDTH (s)) | |
1704 | s->desired_glyphs->highlight[vpos] = mode_line_inverse_video; | |
1705 | ||
1706 | #ifdef HAVE_X_WINDOWS | |
1707 | /* I'm trying this out because I saw Unimpress use it, but it's | |
1708 | possible that this may fuck adversely with some window managers. jla */ | |
1709 | ||
1710 | if (SCREEN_IS_X (s) | |
1711 | && (XTYPE (Vglobal_minibuffer_screen) != Lisp_Screen | |
1712 | || s != XSCREEN (Vglobal_minibuffer_screen)) | |
1713 | && w == XWINDOW (s->selected_window) | |
1714 | && (NULL (Fstring_equal (XBUFFER (w->buffer)->name, s->name)))) | |
1715 | x_set_name (s, XBUFFER (w->buffer)->name, Qnil); | |
1716 | #endif | |
1717 | } | |
1718 | ||
1719 | /* Contribute ELT to the mode line for window W. | |
1720 | How it translates into text depends on its data type. | |
1721 | ||
1722 | VPOS is the position of the mode line being displayed. | |
1723 | ||
1724 | HPOS is the position (absolute on screen) where this element's text | |
1725 | should start. The output is truncated automatically at the right | |
1726 | edge of window W. | |
1727 | ||
1728 | DEPTH is the depth in recursion. It is used to prevent | |
1729 | infinite recursion here. | |
1730 | ||
1731 | MINENDCOL is the hpos before which the element may not end. | |
1732 | The element is padded at the right with spaces if nec | |
1733 | to reach this column. | |
1734 | ||
1735 | MAXENDCOL is the hpos past which this element may not extend. | |
1736 | If MINENDCOL is > MAXENDCOL, MINENDCOL takes priority. | |
1737 | (This is necessary to make nested padding and truncation work.) | |
1738 | ||
1739 | Returns the hpos of the end of the text generated by ELT. | |
1740 | The next element will receive that value as its HPOS arg, | |
1741 | so as to concatenate the elements. */ | |
1742 | ||
1743 | static int | |
1744 | display_mode_element (w, vpos, hpos, depth, minendcol, maxendcol, elt) | |
1745 | struct window *w; | |
1746 | register int vpos, hpos; | |
1747 | int depth; | |
1748 | int minendcol; | |
1749 | register int maxendcol; | |
1750 | register Lisp_Object elt; | |
1751 | { | |
1752 | tail_recurse: | |
1753 | if (depth > 10) | |
1754 | goto invalid; | |
1755 | ||
1756 | depth++; | |
1757 | ||
1758 | #ifdef SWITCH_ENUM_BUG | |
1759 | switch ((int) XTYPE (elt)) | |
1760 | #else | |
1761 | switch (XTYPE (elt)) | |
1762 | #endif | |
1763 | { | |
1764 | case Lisp_String: | |
1765 | { | |
1766 | /* A string: output it and check for %-constructs within it. */ | |
1767 | register unsigned char c; | |
1768 | register unsigned char *this = XSTRING (elt)->data; | |
1769 | ||
1770 | while (hpos < maxendcol && *this) | |
1771 | { | |
1772 | unsigned char *last = this; | |
1773 | while ((c = *this++) != '\0' && c != '%') | |
1774 | ; | |
1775 | if (this - 1 != last) | |
1776 | { | |
1777 | register int lim = --this - last + hpos; | |
1778 | hpos = display_string (w, vpos, last, hpos, 0, hpos, | |
1779 | min (lim, maxendcol)); | |
1780 | } | |
1781 | else /* c == '%' */ | |
1782 | { | |
1783 | register int spec_width = 0; | |
1784 | ||
1785 | /* We can't allow -ve args due to the "%-" construct */ | |
1786 | /* Argument specifies minwidth but not maxwidth | |
1787 | (maxwidth can be specified by | |
1788 | (<negative-number> . <stuff>) mode-line elements) */ | |
1789 | ||
1790 | while ((c = *this++) >= '0' && c <= '9') | |
1791 | { | |
1792 | spec_width = spec_width * 10 + (c - '0'); | |
1793 | } | |
1794 | ||
1795 | spec_width += hpos; | |
1796 | if (spec_width > maxendcol) | |
1797 | spec_width = maxendcol; | |
1798 | ||
1799 | if (c == 'M') | |
1800 | hpos = display_mode_element (w, vpos, hpos, depth, | |
1801 | spec_width, maxendcol, | |
1802 | Vglobal_mode_string); | |
1803 | else if (c != 0) | |
1804 | hpos = display_string (w, vpos, | |
1805 | decode_mode_spec (w, c, | |
1806 | maxendcol - hpos), | |
1807 | hpos, 0, spec_width, maxendcol); | |
1808 | } | |
1809 | } | |
1810 | } | |
1811 | break; | |
1812 | ||
1813 | case Lisp_Symbol: | |
1814 | /* A symbol: process the value of the symbol recursively | |
1815 | as if it appeared here directly. Avoid error if symbol void. | |
1816 | Special case: if value of symbol is a string, output the string | |
1817 | literally. */ | |
1818 | { | |
1819 | register Lisp_Object tem; | |
1820 | tem = Fboundp (elt); | |
1821 | if (!NULL (tem)) | |
1822 | { | |
1823 | tem = Fsymbol_value (elt); | |
1824 | /* If value is a string, output that string literally: | |
1825 | don't check for % within it. */ | |
1826 | if (XTYPE (tem) == Lisp_String) | |
1827 | hpos = display_string (w, vpos, XSTRING (tem)->data, | |
1828 | hpos, 0, minendcol, maxendcol); | |
1829 | /* Give up right away for nil or t. */ | |
1830 | else if (!EQ (tem, elt)) | |
1831 | { elt = tem; goto tail_recurse; } | |
1832 | } | |
1833 | } | |
1834 | break; | |
1835 | ||
1836 | case Lisp_Cons: | |
1837 | { | |
1838 | register Lisp_Object car, tem; | |
1839 | ||
1840 | /* A cons cell: three distinct cases. | |
1841 | If first element is a string or a cons, process all the elements | |
1842 | and effectively concatenate them. | |
1843 | If first element is a negative number, truncate displaying cdr to | |
1844 | at most that many characters. If positive, pad (with spaces) | |
1845 | to at least that many characters. | |
1846 | If first element is a symbol, process the cadr or caddr recursively | |
1847 | according to whether the symbol's value is non-nil or nil. */ | |
1848 | car = XCONS (elt)->car; | |
1849 | if (XTYPE (car) == Lisp_Symbol) | |
1850 | { | |
1851 | tem = Fboundp (car); | |
1852 | elt = XCONS (elt)->cdr; | |
1853 | if (XTYPE (elt) != Lisp_Cons) | |
1854 | goto invalid; | |
1855 | /* elt is now the cdr, and we know it is a cons cell. | |
1856 | Use its car if CAR has a non-nil value. */ | |
1857 | if (!NULL (tem)) | |
1858 | { | |
1859 | tem = Fsymbol_value (car); | |
1860 | if (!NULL (tem)) | |
1861 | { elt = XCONS (elt)->car; goto tail_recurse; } | |
1862 | } | |
1863 | /* Symbol's value is nil (or symbol is unbound) | |
1864 | Get the cddr of the original list | |
1865 | and if possible find the caddr and use that. */ | |
1866 | elt = XCONS (elt)->cdr; | |
1867 | if (NULL (elt)) | |
1868 | break; | |
1869 | else if (XTYPE (elt) != Lisp_Cons) | |
1870 | goto invalid; | |
1871 | elt = XCONS (elt)->car; | |
1872 | goto tail_recurse; | |
1873 | } | |
1874 | else if (XTYPE (car) == Lisp_Int) | |
1875 | { | |
1876 | register int lim = XINT (car); | |
1877 | elt = XCONS (elt)->cdr; | |
1878 | if (lim < 0) | |
1879 | /* Negative int means reduce maximum width. | |
1880 | DO NOT change MINENDCOL here! | |
1881 | (20 -10 . foo) should truncate foo to 10 col | |
1882 | and then pad to 20. */ | |
1883 | maxendcol = min (maxendcol, hpos - lim); | |
1884 | else if (lim > 0) | |
1885 | { | |
1886 | /* Padding specified. Don't let it be more than | |
1887 | current maximum. */ | |
1888 | lim += hpos; | |
1889 | if (lim > maxendcol) | |
1890 | lim = maxendcol; | |
1891 | /* If that's more padding than already wanted, queue it. | |
1892 | But don't reduce padding already specified even if | |
1893 | that is beyond the current truncation point. */ | |
1894 | if (lim > minendcol) | |
1895 | minendcol = lim; | |
1896 | } | |
1897 | goto tail_recurse; | |
1898 | } | |
1899 | else if (XTYPE (car) == Lisp_String || XTYPE (car) == Lisp_Cons) | |
1900 | { | |
1901 | register int limit = 50; | |
1902 | /* LIMIT is to protect against circular lists. */ | |
1903 | while (XTYPE (elt) == Lisp_Cons && --limit > 0 | |
1904 | && hpos < maxendcol) | |
1905 | { | |
1906 | hpos = display_mode_element (w, vpos, hpos, depth, | |
1907 | hpos, maxendcol, | |
1908 | XCONS (elt)->car); | |
1909 | elt = XCONS (elt)->cdr; | |
1910 | } | |
1911 | } | |
1912 | } | |
1913 | break; | |
1914 | ||
1915 | default: | |
1916 | invalid: | |
1917 | return (display_string (w, vpos, "*invalid*", hpos, 0, | |
1918 | minendcol, maxendcol)); | |
1919 | } | |
1920 | ||
1921 | end: | |
1922 | if (minendcol > hpos) | |
1923 | hpos = display_string (w, vpos, "", hpos, 0, minendcol, -1); | |
1924 | return hpos; | |
1925 | } | |
1926 | \f | |
1927 | /* Return a string for the output of a mode line %-spec for window W, | |
1928 | generated by character C and width MAXWIDTH. */ | |
1929 | ||
1930 | static char * | |
1931 | decode_mode_spec (w, c, maxwidth) | |
1932 | struct window *w; | |
1933 | register char c; | |
1934 | register int maxwidth; | |
1935 | { | |
1936 | Lisp_Object obj = Qnil; | |
1937 | SCREEN_PTR scr = XSCREEN (WINDOW_SCREEN (w)); | |
1938 | char *decode_mode_spec_buf = (char *) SCREEN_TEMP_GLYPHS (scr)->total_contents; | |
1939 | ||
1940 | if (maxwidth > SCREEN_WIDTH (scr)) | |
1941 | maxwidth = SCREEN_WIDTH (scr); | |
1942 | ||
1943 | switch (c) | |
1944 | { | |
1945 | case 'b': | |
1946 | obj = current_buffer->name; | |
1947 | #if 0 | |
1948 | if (maxwidth >= 3 && XSTRING (obj)->size > maxwidth) | |
1949 | { | |
1950 | bcopy (XSTRING (obj)->data, decode_mode_spec_buf, maxwidth - 1); | |
1951 | decode_mode_spec_buf[maxwidth - 1] = '\\'; | |
1952 | decode_mode_spec_buf[maxwidth] = '\0'; | |
1953 | return decode_mode_spec_buf; | |
1954 | } | |
1955 | #endif | |
1956 | break; | |
1957 | ||
1958 | case 'f': | |
1959 | obj = current_buffer->filename; | |
1960 | #if 0 | |
1961 | if (NULL (obj)) | |
1962 | return "[none]"; | |
1963 | else if (XTYPE (obj) == Lisp_String && XSTRING (obj)->size > maxwidth) | |
1964 | { | |
1965 | bcopy ("...", decode_mode_spec_buf, 3); | |
1966 | bcopy (XSTRING (obj)->data + XSTRING (obj)->size - maxwidth + 3, | |
1967 | decode_mode_spec_buf + 3, maxwidth - 3); | |
1968 | return decode_mode_spec_buf; | |
1969 | } | |
1970 | #endif | |
1971 | break; | |
1972 | ||
1973 | case 'm': | |
1974 | obj = current_buffer->mode_name; | |
1975 | break; | |
1976 | ||
1977 | case 'n': | |
1978 | if (BEGV > BEG || ZV < Z) | |
1979 | return " Narrow"; | |
1980 | break; | |
1981 | ||
1982 | case '*': | |
1983 | if (!NULL (current_buffer->read_only)) | |
1984 | return "%"; | |
1985 | if (MODIFF > current_buffer->save_modified) | |
1986 | return "*"; | |
1987 | return "-"; | |
1988 | ||
1989 | case 's': | |
1990 | /* status of process */ | |
1991 | #ifdef subprocesses | |
1992 | obj = Fget_buffer_process (Fcurrent_buffer ()); | |
1993 | if (NULL (obj)) | |
1994 | return "no process"; | |
1995 | obj = Fsymbol_name (Fprocess_status (obj)); | |
1996 | break; | |
1997 | #else | |
1998 | return "no processes"; | |
1999 | #endif /* subprocesses */ | |
2000 | ||
2001 | case 'p': | |
2002 | { | |
2003 | int pos = marker_position (w->start); | |
2004 | int total = ZV - BEGV; | |
2005 | ||
2006 | if (XFASTINT (w->window_end_pos) <= Z - ZV) | |
2007 | { | |
2008 | if (pos <= BEGV) | |
2009 | return "All"; | |
2010 | else | |
2011 | return "Bottom"; | |
2012 | } | |
2013 | else if (pos <= BEGV) | |
2014 | return "Top"; | |
2015 | else | |
2016 | { | |
2017 | total = ((pos - BEGV) * 100 + total - 1) / total; | |
2018 | /* We can't normally display a 3-digit number, | |
2019 | so get us a 2-digit number that is close. */ | |
2020 | if (total == 100) | |
2021 | total = 99; | |
2022 | sprintf (decode_mode_spec_buf, "%2d%%", total); | |
2023 | return decode_mode_spec_buf; | |
2024 | } | |
2025 | } | |
2026 | ||
2027 | case '%': | |
2028 | return "%"; | |
2029 | ||
2030 | case '[': | |
2031 | { | |
2032 | int i; | |
2033 | char *p; | |
2034 | ||
2035 | if (command_loop_level > 5) | |
2036 | return "[[[... "; | |
2037 | p = decode_mode_spec_buf; | |
2038 | for (i = 0; i < command_loop_level; i++) | |
2039 | *p++ = '['; | |
2040 | *p = 0; | |
2041 | return decode_mode_spec_buf; | |
2042 | } | |
2043 | ||
2044 | case ']': | |
2045 | { | |
2046 | int i; | |
2047 | char *p; | |
2048 | ||
2049 | if (command_loop_level > 5) | |
2050 | return " ...]]]"; | |
2051 | p = decode_mode_spec_buf; | |
2052 | for (i = 0; i < command_loop_level; i++) | |
2053 | *p++ = ']'; | |
2054 | *p = 0; | |
2055 | return decode_mode_spec_buf; | |
2056 | } | |
2057 | ||
2058 | case '-': | |
2059 | { | |
2060 | static char lots_of_dashes[] = "--------------------------------------------------------------------------------------------------------------------------------------------"; | |
2061 | register char *p; | |
2062 | register int i; | |
2063 | ||
2064 | if (maxwidth < sizeof (lots_of_dashes)) | |
2065 | return lots_of_dashes; | |
2066 | else | |
2067 | { | |
2068 | for (p = decode_mode_spec_buf, i = maxwidth; i > 0; i--) | |
2069 | *p++ = '-'; | |
2070 | *p = '\0'; | |
2071 | } | |
2072 | return decode_mode_spec_buf; | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | if (XTYPE (obj) == Lisp_String) | |
2077 | return (char *) XSTRING (obj)->data; | |
2078 | else | |
2079 | return ""; | |
2080 | } | |
2081 | \f | |
2082 | /* Display STRING on one line of window W, starting at HPOS. | |
2083 | Display at position VPOS. Caller should have done get_display_line. | |
2084 | ||
2085 | TRUNCATE is GLYPH to display at end if truncated. Zero for none. | |
2086 | ||
2087 | MINCOL is the first column ok to end at. (Pad with spaces to this col.) | |
2088 | MAXCOL is the last column ok to end at. Truncate here. | |
2089 | -1 for MINCOL or MAXCOL means no explicit minimum or maximum. | |
2090 | Both count from the left edge of the screen, as does HPOS. | |
2091 | The right edge of W is an implicit maximum. | |
2092 | If TRUNCATE is nonzero, the implicit maximum is one column before the edge. | |
2093 | ||
2094 | Returns ending hpos */ | |
2095 | ||
2096 | static int | |
2097 | display_string (w, vpos, string, hpos, truncate, mincol, maxcol) | |
2098 | struct window *w; | |
2099 | unsigned char *string; | |
2100 | int vpos, hpos; | |
2101 | GLYPH truncate; | |
2102 | int mincol, maxcol; | |
2103 | { | |
2104 | register int c; | |
2105 | register GLYPH *p1; | |
2106 | int hscroll = XINT (w->hscroll); | |
2107 | int tab_width = XINT (current_buffer->tab_width); | |
2108 | register GLYPH *start; | |
2109 | register GLYPH *end; | |
2110 | struct screen_glyphs *desired_glyphs = SCREEN_DESIRED_GLYPHS (XSCREEN (w->screen)); | |
2111 | GLYPH *p1start = desired_glyphs->glyphs[vpos] + hpos; | |
2112 | int window_width = XFASTINT (w->width); | |
2113 | ||
2114 | /* Use the standard display table, not the window's display table. | |
2115 | We don't want the mode line in rot13. */ | |
2116 | register struct Lisp_Vector *dp = 0; | |
2117 | ||
2118 | if (XTYPE (Vstandard_display_table) == Lisp_Vector | |
2119 | && XVECTOR (Vstandard_display_table)->size == DISP_TABLE_SIZE) | |
2120 | dp = XVECTOR (Vstandard_display_table); | |
2121 | ||
2122 | if (tab_width <= 0 || tab_width > 20) tab_width = 8; | |
2123 | ||
2124 | p1 = p1start; | |
2125 | start = desired_glyphs->glyphs[vpos] + XFASTINT (w->left); | |
2126 | end = start + window_width - (truncate != 0); | |
2127 | ||
2128 | if ((window_width + XFASTINT (w->left)) | |
2129 | != SCREEN_WIDTH (XSCREEN (WINDOW_SCREEN (w)))) | |
2130 | *end-- = '|'; | |
2131 | ||
2132 | if (maxcol >= 0 && end - desired_glyphs->glyphs[vpos] > maxcol) | |
2133 | end = desired_glyphs->glyphs[vpos] + maxcol; | |
2134 | if (maxcol >= 0 && mincol > maxcol) | |
2135 | mincol = maxcol; | |
2136 | ||
2137 | while (p1 < end) | |
2138 | { | |
2139 | c = *string++; | |
2140 | if (!c) break; | |
2141 | if (c >= 040 && c < 0177 | |
2142 | && (dp == 0 || XTYPE (DISP_CHAR_ROPE (dp, c)) != Lisp_String)) | |
2143 | { | |
2144 | if (p1 >= start) | |
2145 | *p1 = c; | |
2146 | p1++; | |
2147 | } | |
2148 | else if (c == '\t') | |
2149 | { | |
2150 | do | |
2151 | { | |
2152 | if (p1 >= start && p1 < end) | |
2153 | *p1 = SPACEGLYPH; | |
2154 | p1++; | |
2155 | } | |
2156 | while ((p1 - start + hscroll - (hscroll > 0)) % tab_width); | |
2157 | } | |
2158 | else if (dp != 0 && XTYPE (DISP_CHAR_ROPE (dp, c)) == Lisp_String) | |
2159 | p1 = copy_rope (p1, start, DISP_CHAR_ROPE (dp, c)); | |
2160 | else if (c < 0200 && buffer_defaults.ctl_arrow) | |
2161 | { | |
2162 | if (p1 >= start) | |
2163 | *p1 = (dp && XTYPE (DISP_CTRL_GLYPH (dp)) == Lisp_Int | |
2164 | ? XINT (DISP_CTRL_GLYPH (dp)) : '^'); | |
2165 | p1++; | |
2166 | if (p1 >= start) | |
2167 | *p1 = c ^ 0100; | |
2168 | p1++; | |
2169 | } | |
2170 | else | |
2171 | { | |
2172 | if (p1 >= start) | |
2173 | *p1 = (dp && XTYPE (DISP_ESCAPE_GLYPH (dp)) == Lisp_Int | |
2174 | ? XINT (DISP_ESCAPE_GLYPH (dp)) : '\\'); | |
2175 | p1++; | |
2176 | if (p1 >= start) | |
2177 | *p1 = (c >> 6) + '0'; | |
2178 | p1++; | |
2179 | if (p1 >= start) | |
2180 | *p1 = (7 & (c >> 3)) + '0'; | |
2181 | p1++; | |
2182 | if (p1 >= start) | |
2183 | *p1 = (7 & c) + '0'; | |
2184 | p1++; | |
2185 | } | |
2186 | } | |
2187 | ||
2188 | if (c) | |
2189 | { | |
2190 | p1 = end; | |
2191 | if (truncate) *p1++ = truncate; | |
2192 | } | |
2193 | else if (mincol >= 0) | |
2194 | { | |
2195 | end = desired_glyphs->glyphs[vpos] + mincol; | |
2196 | while (p1 < end) | |
2197 | *p1++ = SPACEGLYPH; | |
2198 | } | |
2199 | ||
2200 | { | |
2201 | register int len = p1 - desired_glyphs->glyphs[vpos]; | |
2202 | ||
2203 | if (len > desired_glyphs->used[vpos]) | |
2204 | desired_glyphs->used[vpos] = len; | |
2205 | desired_glyphs->glyphs[vpos][desired_glyphs->used[vpos]] = 0; | |
2206 | ||
2207 | return len; | |
2208 | } | |
2209 | } | |
2210 | \f | |
2211 | void | |
2212 | syms_of_xdisp () | |
2213 | { | |
2214 | staticpro (&last_arrow_position); | |
2215 | staticpro (&last_arrow_string); | |
2216 | last_arrow_position = Qnil; | |
2217 | last_arrow_string = Qnil; | |
2218 | ||
2219 | DEFVAR_LISP ("global-mode-string", &Vglobal_mode_string, | |
2220 | "String displayed by mode-line-format's \"%m\" specifiation."); | |
2221 | Vglobal_mode_string = Qnil; | |
2222 | ||
2223 | DEFVAR_LISP ("overlay-arrow-position", &Voverlay_arrow_position, | |
2224 | "Marker for where to display an arrow on top of the buffer text.\n\ | |
2225 | This must be the beginning of a line in order to work.\n\ | |
2226 | See also `overlay-arrow-string'."); | |
2227 | Voverlay_arrow_position = Qnil; | |
2228 | ||
2229 | DEFVAR_LISP ("overlay-arrow-string", &Voverlay_arrow_string, | |
2230 | "String to display as an arrow. See also `overlay-arrow-position'."); | |
2231 | Voverlay_arrow_string = Qnil; | |
2232 | ||
2233 | DEFVAR_INT ("scroll-step", &scroll_step, | |
2234 | "*The number of lines to try scrolling a window by when point moves out.\n\ | |
2235 | If that fails to bring point back on screen, point is centered instead.\n\ | |
2236 | If this is zero, point is always centered after it moves off screen."); | |
2237 | ||
2238 | DEFVAR_INT ("debug-end-pos", &debug_end_pos, "Don't ask"); | |
2239 | ||
2240 | DEFVAR_BOOL ("truncate-partial-width-windows", | |
2241 | &truncate_partial_width_windows, | |
2242 | "*Non-nil means truncate lines in all windows less than full screen wide."); | |
2243 | truncate_partial_width_windows = 1; | |
2244 | ||
2245 | DEFVAR_BOOL ("mode-line-inverse-video", &mode_line_inverse_video, | |
2246 | "*Non-nil means use inverse video for the mode line."); | |
2247 | mode_line_inverse_video = 1; | |
2248 | ||
2249 | #ifndef MULTI_SCREEN | |
2250 | defsubr (&Sredraw_display); | |
2251 | #endif /* MULTI_SCREEN */ | |
2252 | } | |
2253 | ||
2254 | /* initialize the window system */ | |
2255 | init_xdisp () | |
2256 | { | |
2257 | Lisp_Object root_window; | |
2258 | #ifndef COMPILER_REGISTER_BUG | |
2259 | register | |
2260 | #endif /* COMPILER_REGISTER_BUG */ | |
2261 | struct window *mini_w; | |
2262 | ||
2263 | this_line_bufpos = 0; | |
2264 | ||
2265 | mini_w = XWINDOW (minibuf_window); | |
2266 | root_window = mini_w->prev; | |
2267 | ||
2268 | echo_area_glyphs = 0; | |
2269 | previous_echo_glyphs = 0; | |
2270 | ||
2271 | if (!noninteractive) | |
2272 | { | |
2273 | SCREEN_PTR s = XSCREEN (WINDOW_SCREEN (XWINDOW (root_window))); | |
2274 | XFASTINT (XWINDOW (root_window)->top) = 0; | |
2275 | set_window_height (root_window, SCREEN_HEIGHT (s) - 1, 0); | |
2276 | XFASTINT (mini_w->top) = SCREEN_HEIGHT (s) - 1; | |
2277 | set_window_height (minibuf_window, 1, 0); | |
2278 | ||
2279 | XFASTINT (XWINDOW (root_window)->width) = SCREEN_WIDTH (s); | |
2280 | XFASTINT (mini_w->width) = SCREEN_WIDTH (s); | |
2281 | } | |
2282 | } |