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15637ed4 RG |
1 | /* redraw.c */ |
2 | ||
3 | /* Author: | |
4 | * Steve Kirkendall | |
5 | * 14407 SW Teal Blvd. #C | |
6 | * Beaverton, OR 97005 | |
7 | * kirkenda@cs.pdx.edu | |
8 | */ | |
9 | ||
10 | ||
11 | /* This file contains functions that draw text on the screen. The major entry | |
12 | * points are: | |
13 | * redrawrange() - called from modify.c to give hints about what parts | |
14 | * of the screen need to be redrawn. | |
15 | * redraw() - redraws the screen (or part of it) and positions | |
16 | * the cursor where it belongs. | |
17 | * idx2col() - converts a markidx() value to a logical column number. | |
18 | */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "vi.h" | |
78ed81a3 | 22 | #ifdef CRUNCH |
23 | # define NEAR LINES | |
24 | #else | |
25 | # define NEAR (*o_nearscroll&0xff) | |
26 | #endif | |
15637ed4 RG |
27 | |
28 | /* This variable contains the line number that smartdrawtext() knows best */ | |
29 | static long smartlno; | |
30 | ||
31 | /* This function remembers where changes were made, so that the screen can be | |
32 | * redraw in a more efficient manner. | |
33 | */ | |
34 | static long redrawafter; /* line# of first line that must be redrawn */ | |
35 | static long preredraw; /* line# of last line changed, before change */ | |
36 | static long postredraw; /* line# of last line changed, after change */ | |
37 | static int mustredraw; /* boolean: anything forcing a screen update? */ | |
38 | void redrawrange(after, pre, post) | |
39 | long after; /* lower bound of redrawafter */ | |
40 | long pre; /* upper bound of preredraw */ | |
41 | long post; /* upper bound of postredraw */ | |
42 | { | |
43 | if (after == redrawafter) | |
44 | { | |
45 | /* multiple insertions/deletions at the same place -- combine | |
46 | * them | |
47 | */ | |
48 | preredraw -= (post - pre); | |
49 | if (postredraw < post) | |
50 | { | |
51 | preredraw += (post - postredraw); | |
52 | postredraw = post; | |
53 | } | |
54 | if (redrawafter > preredraw) | |
55 | { | |
56 | redrawafter = preredraw; | |
57 | } | |
58 | if (redrawafter < 1L) | |
59 | { | |
60 | redrawafter = 0L; | |
61 | preredraw = postredraw = INFINITY; | |
62 | } | |
63 | } | |
64 | else if (postredraw > 0L) | |
65 | { | |
66 | /* multiple changes in different places -- redraw everything | |
67 | * after "after". | |
68 | */ | |
69 | postredraw = preredraw = INFINITY; | |
70 | if (after < redrawafter) | |
71 | redrawafter = after; | |
72 | } | |
73 | else | |
74 | { | |
75 | /* first change */ | |
76 | redrawafter = after; | |
77 | preredraw = pre; | |
78 | postredraw = post; | |
79 | } | |
80 | mustredraw = TRUE; | |
81 | } | |
82 | ||
83 | ||
84 | #ifndef NO_CHARATTR | |
85 | /* see if a given line uses character attribute strings */ | |
86 | static int hasattr(lno, text) | |
87 | long lno; /* the line# of the cursor */ | |
88 | REG char *text; /* the text of the line, from fetchline */ | |
89 | { | |
90 | static long plno; /* previous line number */ | |
91 | static long chgs; /* previous value of changes counter */ | |
92 | static int panswer;/* previous answer */ | |
93 | char *scan; | |
94 | ||
95 | /* if charattr is off, then the answer is "no, it doesn't" */ | |
96 | if (!*o_charattr) | |
97 | { | |
98 | chgs = 0; /* <- forces us to check if charattr is later set */ | |
99 | return FALSE; | |
100 | } | |
101 | ||
102 | /* if we already know the answer, return it... */ | |
103 | if (lno == plno && chgs == changes) | |
104 | { | |
105 | return panswer; | |
106 | } | |
107 | ||
108 | /* get the line & look for "\fX" */ | |
109 | if (!text[0] || !text[1] || !text[2]) | |
110 | { | |
111 | panswer = FALSE; | |
112 | } | |
113 | else | |
114 | { | |
115 | for (scan = text; scan[2] && !(scan[0] == '\\' && scan[1] == 'f'); scan++) | |
116 | { | |
117 | } | |
118 | panswer = (scan[2] != '\0'); | |
119 | } | |
120 | ||
121 | /* save the results */ | |
122 | plno = lno; | |
123 | chgs = changes; | |
124 | ||
125 | /* return the results */ | |
126 | return panswer; | |
127 | } | |
128 | #endif | |
129 | ||
130 | ||
131 | #ifndef NO_VISIBLE | |
132 | /* This function checks to make sure that the correct lines are shown in | |
133 | * reverse-video. This is used to handle the "v" and "V" commands. | |
134 | */ | |
135 | static long vizlow, vizhigh; /* the starting and ending lines */ | |
136 | static int vizleft, vizright; /* starting & ending indicies */ | |
137 | static int vizchange; /* boolean: must use stupid drawtext? */ | |
138 | static void setviz(curs) | |
139 | MARK curs; | |
140 | { | |
141 | long newlow, newhigh; | |
142 | long extra = 0L; | |
143 | ||
144 | /* for now, assume the worst... */ | |
145 | vizchange = TRUE; | |
146 | ||
147 | /* set newlow & newhigh according to V_from and cursor */ | |
148 | if (!V_from) | |
149 | { | |
150 | /* no lines should have reverse-video */ | |
151 | if (vizlow) | |
152 | { | |
153 | redrawrange(vizlow, vizhigh + 1L, vizhigh + 1L); | |
154 | vizlow = vizhigh = 0L; | |
155 | } | |
156 | else | |
157 | { | |
158 | vizchange = FALSE; | |
159 | } | |
160 | return; | |
161 | } | |
162 | ||
163 | /* figure out which lines *SHOULD* have hilites */ | |
164 | if (V_from < curs) | |
165 | { | |
166 | newlow = markline(V_from); | |
167 | newhigh = markline(curs); | |
168 | vizleft = markidx(V_from); | |
169 | vizright = markidx(curs) + 1; | |
170 | } | |
171 | else | |
172 | { | |
173 | newlow = markline(curs); | |
174 | newhigh = markline(V_from); | |
175 | vizleft = markidx(curs); | |
176 | vizright = markidx(V_from) + 1; | |
177 | } | |
178 | ||
179 | /* adjust for line-mode hiliting */ | |
180 | if (V_linemd) | |
181 | { | |
182 | vizleft = 0; | |
183 | vizright = BLKSIZE - 1; | |
184 | } | |
185 | else | |
186 | { | |
187 | extra = 1L; | |
188 | } | |
189 | ||
190 | /* arrange for the necessary lines to be redrawn */ | |
191 | if (vizlow == 0L) | |
192 | { | |
193 | /* just starting to redraw */ | |
194 | redrawrange(newlow, newhigh, newhigh); | |
195 | } | |
196 | else | |
197 | { | |
198 | /* Were new lines added/removed at the front? */ | |
199 | if (newlow != vizlow) | |
200 | { | |
201 | if (newlow < vizlow) | |
202 | redrawrange(newlow, vizlow + extra, vizlow + extra); | |
203 | else | |
204 | redrawrange(vizlow, newlow + extra, newlow + extra); | |
205 | } | |
206 | ||
207 | /* Were new lines added/removed at the back? */ | |
208 | if (newhigh != vizhigh) | |
209 | { | |
210 | if (newhigh < vizhigh) | |
211 | redrawrange(newhigh + 1L - extra, vizhigh + 1L, vizhigh + 1L); | |
212 | else | |
213 | redrawrange(vizhigh + 1L - extra, newhigh, newhigh); | |
214 | } | |
215 | } | |
216 | ||
217 | /* remember which lines will contain hilighted text now */ | |
218 | vizlow = newlow; | |
219 | vizhigh = newhigh; | |
220 | } | |
221 | #endif /* !NO_VISIBLE */ | |
222 | ||
223 | ||
224 | /* This function converts a MARK to a column number. It doesn't automatically | |
225 | * adjust for leftcol; that must be done by the calling function | |
226 | */ | |
227 | int idx2col(curs, text, inputting) | |
228 | MARK curs; /* the line# & index# of the cursor */ | |
229 | REG char *text; /* the text of the line, from fetchline */ | |
230 | int inputting; /* boolean: called from input() ? */ | |
231 | { | |
232 | static MARK pcursor;/* previous cursor, for possible shortcut */ | |
233 | static MARK pcol; /* column number for pcol */ | |
234 | static long chgs; /* previous value of changes counter */ | |
235 | REG int col; /* used to count column numbers */ | |
236 | REG int idx; /* used to count down the index */ | |
237 | REG int i; | |
238 | ||
239 | /* for now, assume we have to start counting at the left edge */ | |
240 | col = 0; | |
241 | idx = markidx(curs); | |
242 | ||
243 | /* if the file hasn't changed & line number is the same & it has no | |
244 | * embedded character attribute strings, can we do shortcuts? | |
245 | */ | |
246 | if (chgs == changes | |
247 | && !((curs ^ pcursor) & ~(BLKSIZE - 1)) | |
248 | #ifndef NO_CHARATTR | |
249 | && !hasattr(markline(curs), text) | |
250 | #endif | |
251 | ) | |
252 | { | |
253 | /* no movement? */ | |
254 | if (curs == pcursor) | |
255 | { | |
256 | /* return the column of the char; for tabs, return its last column */ | |
257 | if (text[idx] == '\t' && !inputting && !*o_list) | |
258 | { | |
259 | return pcol + *o_tabstop - (pcol % *o_tabstop) - 1; | |
260 | } | |
261 | else | |
262 | { | |
263 | return pcol; | |
264 | } | |
265 | } | |
266 | ||
267 | /* movement to right? */ | |
268 | if (curs > pcursor) | |
269 | { | |
270 | /* start counting from previous place */ | |
271 | col = pcol; | |
272 | idx = markidx(curs) - markidx(pcursor); | |
273 | text += markidx(pcursor); | |
274 | } | |
275 | } | |
276 | ||
277 | /* count over to the char after the idx position */ | |
278 | while (idx > 0 && (i = *text)) /* yes, ASSIGNMENT! */ | |
279 | { | |
280 | if (i == '\t' && !*o_list) | |
281 | { | |
282 | col += *o_tabstop; | |
283 | col -= col % *o_tabstop; | |
284 | } | |
285 | else if (i >= '\0' && i < ' ' || i == '\177') | |
286 | { | |
287 | col += 2; | |
288 | } | |
289 | #ifndef NO_CHARATTR | |
290 | else if (i == '\\' && text[1] == 'f' && text[2] && *o_charattr) | |
291 | { | |
292 | text += 2; /* plus one more at bottom of loop */ | |
293 | idx -= 2; | |
294 | } | |
295 | #endif | |
296 | else | |
297 | { | |
298 | col++; | |
299 | } | |
300 | text++; | |
301 | idx--; | |
302 | } | |
303 | ||
304 | /* save stuff to speed next call */ | |
305 | pcursor = curs; | |
306 | pcol = col; | |
307 | chgs = changes; | |
308 | ||
309 | /* return the column of the char; for tabs, return its last column */ | |
310 | if (*text == '\t' && !inputting && !*o_list) | |
311 | { | |
312 | return col + *o_tabstop - (col % *o_tabstop) - 1; | |
313 | } | |
314 | else | |
315 | { | |
316 | return col; | |
317 | } | |
318 | } | |
319 | ||
320 | ||
321 | /* This function is similar to idx2col except that it takes care of sideways | |
322 | * scrolling - for the given line, at least. | |
323 | */ | |
324 | int mark2phys(m, text, inputting) | |
325 | MARK m; /* a mark to convert */ | |
326 | char *text; /* the line that m refers to */ | |
327 | int inputting; /* boolean: caled from input() ? */ | |
328 | { | |
329 | int i; | |
330 | ||
331 | i = idx2col(m, text, inputting); | |
332 | while (i < leftcol) | |
333 | { | |
334 | leftcol -= *o_sidescroll; | |
335 | mustredraw = TRUE; | |
336 | redrawrange(1L, INFINITY, INFINITY); | |
337 | } | |
338 | while (i > rightcol) | |
339 | { | |
340 | leftcol += *o_sidescroll; | |
341 | mustredraw = TRUE; | |
342 | redrawrange(1L, INFINITY, INFINITY); | |
343 | } | |
344 | physrow = markline(m) - topline; | |
345 | physcol = i - leftcol; | |
346 | if (*o_number) | |
347 | physcol += 8; | |
348 | ||
349 | return physcol; | |
350 | } | |
351 | ||
352 | /* This function draws a single line of text on the screen. The screen's | |
353 | * cursor is assumed to be located at the leftmost column of the appropriate | |
354 | * row. | |
355 | */ | |
356 | static void drawtext(text, lno, clr) | |
357 | REG char *text; /* the text to draw */ | |
358 | long lno; /* the number of the line to draw */ | |
359 | int clr; /* boolean: do a clrtoeol? */ | |
360 | { | |
361 | REG int col; /* column number */ | |
362 | REG int i; | |
363 | REG int tabstop; /* *o_tabstop */ | |
364 | REG int limitcol; /* leftcol or leftcol + COLS */ | |
365 | int abnormal; /* boolean: charattr != A_NORMAL? */ | |
366 | #ifndef NO_VISIBLE | |
367 | int rev; /* boolean: standout mode, too? */ | |
368 | int idx = 0; | |
369 | #endif | |
370 | char numstr[9]; | |
371 | ||
372 | /* show the line number, if necessary */ | |
373 | if (*o_number) | |
374 | { | |
78ed81a3 | 375 | sprintf(numstr, "%6ld ", lno); |
15637ed4 RG |
376 | qaddstr(numstr); |
377 | } | |
378 | ||
379 | #ifndef NO_SENTENCE | |
380 | /* if we're hiding format lines, and this is one of them, then hide it */ | |
381 | if (*o_hideformat && *text == '.') | |
382 | { | |
383 | clrtoeol(); | |
384 | #if OSK | |
385 | qaddch('\l'); | |
386 | #else | |
387 | qaddch('\n'); | |
388 | #endif | |
389 | return; | |
390 | } | |
391 | #endif | |
392 | ||
393 | /* move some things into registers... */ | |
394 | limitcol = leftcol; | |
395 | tabstop = *o_tabstop; | |
396 | abnormal = FALSE; | |
397 | ||
398 | #ifndef CRUNCH | |
399 | if (clr) | |
400 | clrtoeol(); | |
401 | #endif | |
402 | ||
403 | /* skip stuff that was scrolled off left edge */ | |
404 | for (col = 0; | |
405 | (i = *text) && col < limitcol; /* yes, ASSIGNMENT! */ | |
406 | text++) | |
407 | { | |
408 | #ifndef NO_VISIBLE | |
409 | idx++; | |
410 | #endif | |
411 | if (i == '\t' && !*o_list) | |
412 | { | |
413 | col = col + tabstop - (col % tabstop); | |
414 | } | |
415 | else if (i >= 0 && i < ' ' || i == '\177') | |
416 | { | |
417 | col += 2; | |
418 | } | |
419 | #ifndef NO_CHARATTR | |
420 | else if (i == '\\' && text[1] == 'f' && text[2] && *o_charattr) | |
421 | { | |
422 | text += 2; /* plus one more as part of "for" loop */ | |
423 | ||
424 | /* since this attribute might carry over, we need it */ | |
425 | switch (*text) | |
426 | { | |
427 | case 'R': | |
428 | case 'P': | |
429 | attrset(A_NORMAL); | |
430 | abnormal = FALSE; | |
431 | break; | |
432 | ||
433 | case 'B': | |
434 | attrset(A_BOLD); | |
435 | abnormal = TRUE; | |
436 | break; | |
437 | ||
438 | case 'U': | |
439 | attrset(A_UNDERLINE); | |
440 | abnormal = TRUE; | |
441 | break; | |
442 | ||
443 | case 'I': | |
444 | attrset(A_ALTCHARSET); | |
445 | abnormal = TRUE; | |
446 | break; | |
447 | } | |
448 | } | |
449 | #endif | |
450 | else | |
451 | { | |
452 | col++; | |
453 | } | |
454 | } | |
455 | ||
456 | #ifndef NO_VISIBLE | |
457 | /* Should we start hiliting at the first char of this line? */ | |
458 | if ((lno > vizlow && lno <= vizhigh | |
459 | || lno == vizlow && vizleft < idx) | |
460 | && !(lno == vizhigh && vizright < idx)) | |
461 | { | |
462 | do_VISIBLE(); | |
463 | rev = TRUE; | |
464 | } | |
465 | #endif | |
466 | ||
467 | /* adjust for control char that was partially visible */ | |
468 | while (col > limitcol) | |
469 | { | |
470 | qaddch(' '); | |
471 | limitcol++; | |
472 | } | |
473 | ||
474 | /* now for the visible characters */ | |
475 | limitcol = leftcol + COLS; | |
476 | if (*o_number) | |
477 | limitcol -= 8; | |
478 | for (; (i = *text) && col < limitcol; text++) | |
479 | { | |
480 | #ifndef NO_VISIBLE | |
481 | /* maybe turn hilite on/off in the middle of the line */ | |
482 | if (lno == vizlow && vizleft == idx) | |
483 | { | |
484 | do_VISIBLE(); | |
485 | rev = TRUE; | |
486 | } | |
487 | if (lno == vizhigh && vizright == idx) | |
488 | { | |
489 | do_SE(); | |
490 | rev = FALSE; | |
491 | } | |
492 | idx++; | |
493 | ||
494 | /* if hiliting, never emit physical tabs */ | |
495 | if (rev && i == '\t' && !*o_list) | |
496 | { | |
497 | i = col + tabstop - (col % tabstop); | |
498 | do | |
499 | { | |
500 | qaddch(' '); | |
501 | col++; | |
78ed81a3 | 502 | } while (col < i && col < limitcol); |
15637ed4 RG |
503 | } |
504 | else | |
505 | #endif /* !NO_VISIBLE */ | |
506 | if (i == '\t' && !*o_list) | |
507 | { | |
508 | i = col + tabstop - (col % tabstop); | |
509 | if (i < limitcol) | |
510 | { | |
511 | #ifdef CRUNCH | |
512 | if (!clr && has_PT && !((i - leftcol) & 7)) | |
513 | #else | |
514 | if (has_PT && !((i - leftcol) & 7)) | |
515 | #endif | |
516 | { | |
517 | do | |
518 | { | |
519 | qaddch('\t'); | |
520 | col += 8; /* not exact! */ | |
521 | } while (col < i); | |
522 | col = i; /* NOW it is exact */ | |
523 | } | |
524 | else | |
525 | { | |
526 | do | |
527 | { | |
528 | qaddch(' '); | |
529 | col++; | |
78ed81a3 | 530 | } while (col < i && col < limitcol); |
15637ed4 RG |
531 | } |
532 | } | |
533 | else /* tab ending after screen? next line! */ | |
534 | { | |
78ed81a3 | 535 | #ifdef CRUNCH |
536 | /* needed at least when scrolling the screen right -nox */ | |
537 | if (clr && col < limitcol) | |
538 | clrtoeol(); | |
539 | #endif | |
15637ed4 RG |
540 | col = limitcol; |
541 | if (has_AM) | |
542 | { | |
543 | addch('\n'); /* GB */ | |
544 | } | |
545 | } | |
546 | } | |
547 | else if (i >= 0 && i < ' ' || i == '\177') | |
548 | { | |
549 | col += 2; | |
550 | qaddch('^'); | |
551 | if (col <= limitcol) | |
552 | { | |
553 | qaddch(i ^ '@'); | |
554 | } | |
555 | } | |
556 | #ifndef NO_CHARATTR | |
557 | else if (i == '\\' && text[1] == 'f' && text[2] && *o_charattr) | |
558 | { | |
559 | text += 2; /* plus one more as part of "for" loop */ | |
560 | switch (*text) | |
561 | { | |
562 | case 'R': | |
563 | case 'P': | |
564 | attrset(A_NORMAL); | |
565 | abnormal = FALSE; | |
566 | break; | |
567 | ||
568 | case 'B': | |
569 | attrset(A_BOLD); | |
570 | abnormal = TRUE; | |
571 | break; | |
572 | ||
573 | case 'U': | |
574 | attrset(A_UNDERLINE); | |
575 | abnormal = TRUE; | |
576 | break; | |
577 | ||
578 | case 'I': | |
579 | attrset(A_ALTCHARSET); | |
580 | abnormal = TRUE; | |
581 | break; | |
582 | } | |
583 | } | |
584 | #endif | |
585 | else | |
586 | { | |
587 | col++; | |
588 | qaddch(i); | |
589 | } | |
590 | } | |
591 | ||
592 | /* get ready for the next line */ | |
593 | #ifndef NO_CHARATTR | |
594 | if (abnormal) | |
595 | { | |
596 | attrset(A_NORMAL); | |
597 | } | |
598 | #endif | |
599 | if (*o_list && col < limitcol) | |
600 | { | |
601 | qaddch('$'); | |
602 | col++; | |
603 | } | |
604 | ||
605 | #ifndef NO_VISIBLE | |
606 | /* did we hilite this whole line? If so, STOP! */ | |
607 | if (rev) | |
608 | { | |
609 | do_SE(); | |
610 | } | |
611 | #endif | |
612 | ||
613 | #ifdef CRUNCH | |
614 | if (clr && col < limitcol) | |
615 | { | |
616 | clrtoeol(); | |
617 | } | |
618 | #endif | |
619 | if (!has_AM || col < limitcol) | |
620 | { | |
621 | addch('\n'); | |
622 | } | |
623 | ||
624 | wqrefresh(); | |
625 | } | |
626 | ||
627 | ||
628 | #ifndef CRUNCH | |
629 | static void nudgecursor(same, scan, new, lno) | |
630 | int same; /* number of chars to be skipped over */ | |
631 | char *scan; /* where the same chars end */ | |
632 | char *new; /* where the visible part of the line starts */ | |
633 | long lno; /* line number of this line */ | |
634 | { | |
635 | int col; | |
636 | ||
637 | if (same > 0) | |
638 | { | |
639 | if (same < 5) | |
640 | { | |
641 | /* move the cursor by overwriting */ | |
642 | while (same > 0) | |
643 | { | |
644 | qaddch(scan[-same]); | |
645 | same--; | |
646 | } | |
647 | } | |
648 | else | |
649 | { | |
650 | /* move the cursor by calling move() */ | |
651 | col = (int)(scan - new); | |
652 | if (*o_number) | |
653 | col += 8; | |
654 | move((int)(lno - topline), col); | |
655 | } | |
656 | } | |
657 | } | |
658 | #endif /* not CRUNCH */ | |
659 | ||
660 | /* This function draws a single line of text on the screen, possibly with | |
661 | * some cursor optimization. The cursor is repositioned before drawing | |
662 | * begins, so its position before doesn't really matter. | |
663 | */ | |
664 | static void smartdrawtext(text, lno, showit) | |
665 | REG char *text; /* the text to draw */ | |
666 | long lno; /* line number of the text */ | |
667 | int showit; /* boolean: output line? (else just remember it) */ | |
668 | { | |
669 | #ifdef CRUNCH | |
670 | move((int)(lno - topline), 0); | |
671 | if (showit) | |
672 | { | |
673 | drawtext(text, lno, TRUE); | |
674 | } | |
675 | #else /* not CRUNCH */ | |
676 | static char old[256]; /* how the line looked last time */ | |
677 | char new[256]; /* how it looks now */ | |
678 | char *build; /* used to put chars into new[] */ | |
679 | char *scan; /* used for moving thru new[] or old[] */ | |
680 | char *end; /* last non-blank changed char */ | |
681 | char *shift; /* used to insert/delete chars */ | |
682 | int same; /* length of a run of unchanged chars */ | |
683 | int limitcol; | |
684 | int col; | |
685 | int i; | |
686 | char numstr[9]; | |
687 | ||
688 | # ifndef NO_CHARATTR | |
689 | /* if this line has attributes, do it the dumb way instead */ | |
690 | if (hasattr(lno, text)) | |
691 | { | |
692 | move((int)(lno - topline), 0); | |
693 | drawtext(text, lno, TRUE); | |
694 | return; | |
695 | } | |
696 | # endif | |
697 | # ifndef NO_SENTENCE | |
698 | /* if this line is a format line, & we're hiding format lines, then | |
699 | * let the dumb drawtext() function handle it | |
700 | */ | |
701 | if (*o_hideformat && *text == '.') | |
702 | { | |
703 | move((int)(lno - topline), 0); | |
704 | drawtext(text, lno, TRUE); | |
705 | return; | |
706 | } | |
707 | # endif | |
708 | # ifndef NO_VISIBLE | |
709 | if (vizchange) | |
710 | { | |
711 | move((int)(lno - topline), 0); | |
712 | drawtext(text, lno, TRUE); | |
713 | smartlno = 0L; | |
714 | return; | |
715 | } | |
716 | # endif | |
717 | ||
718 | /* skip stuff that was scrolled off left edge */ | |
719 | limitcol = leftcol; | |
720 | for (col = 0; | |
721 | (i = *text) && col < limitcol; /* yes, ASSIGNMENT! */ | |
722 | text++) | |
723 | { | |
724 | if (i == '\t' && !*o_list) | |
725 | { | |
726 | col = col + *o_tabstop - (col % *o_tabstop); | |
727 | } | |
728 | else if (i >= 0 && i < ' ' || i == '\177') | |
729 | { | |
730 | col += 2; | |
731 | } | |
732 | else | |
733 | { | |
734 | col++; | |
735 | } | |
736 | } | |
737 | ||
738 | /* adjust for control char that was partially visible */ | |
739 | build = new; | |
740 | while (col > limitcol) | |
741 | { | |
742 | *build++ = ' '; | |
743 | limitcol++; | |
744 | } | |
745 | ||
746 | /* now for the visible characters */ | |
747 | limitcol = leftcol + COLS; | |
748 | if (*o_number) | |
749 | limitcol -= 8; | |
750 | for (; (i = *text) && col < limitcol; text++) | |
751 | { | |
752 | if (i == '\t' && !*o_list) | |
753 | { | |
754 | i = col + *o_tabstop - (col % *o_tabstop); | |
755 | while (col < i && col < limitcol) | |
756 | { | |
757 | *build++ = ' '; | |
758 | col++; | |
759 | } | |
760 | } | |
761 | else if (i >= 0 && i < ' ' || i == '\177') | |
762 | { | |
763 | col += 2; | |
764 | *build++ = '^'; | |
765 | if (col <= limitcol) | |
766 | { | |
767 | *build++ = (i ^ '@'); | |
768 | } | |
769 | } | |
770 | else | |
771 | { | |
772 | col++; | |
773 | *build++ = i; | |
774 | } | |
775 | } | |
776 | if (col < limitcol && *o_list) | |
777 | { | |
778 | *build++ = '$'; | |
779 | col++; | |
780 | } | |
781 | end = build; | |
782 | while (col < limitcol) | |
783 | { | |
784 | *build++ = ' '; | |
785 | col++; | |
786 | } | |
787 | ||
788 | /* if we're just supposed to remember this line, then remember it */ | |
789 | if (!showit) | |
790 | { | |
791 | smartlno = lno; | |
792 | strncpy(old, new, COLS); | |
793 | return; | |
794 | } | |
795 | ||
796 | /* locate the last non-blank character */ | |
797 | while (end > new && end[-1] == ' ') | |
798 | { | |
799 | end--; | |
800 | } | |
801 | ||
802 | /* can we optimize the displaying of this line? */ | |
803 | if (lno != smartlno) | |
804 | { | |
805 | /* nope, can't optimize - different line */ | |
806 | move((int)(lno - topline), 0); | |
807 | ||
808 | /* show the line number, if necessary */ | |
809 | if (*o_number) | |
810 | { | |
78ed81a3 | 811 | sprintf(numstr, "%6ld ", lno); |
15637ed4 RG |
812 | qaddstr(numstr); |
813 | } | |
814 | ||
815 | /* show the new line */ | |
816 | for (scan = new, build = old; scan < end; ) | |
817 | { | |
818 | qaddch(*scan); | |
819 | *build++ = *scan++; | |
820 | } | |
821 | if (end < new + COLS - (*o_number ? 8 : 0)) | |
822 | { | |
823 | clrtoeol(); | |
824 | while (build < old + COLS) | |
825 | { | |
826 | *build++ = ' '; | |
827 | } | |
828 | } | |
829 | smartlno = lno; | |
830 | return; | |
831 | } | |
832 | ||
833 | /* skip any initial unchanged characters */ | |
834 | for (scan = new, build = old; scan < end && *scan == *build; scan++, build++) | |
835 | { | |
836 | } | |
837 | i = (scan - new); | |
838 | if (*o_number) | |
839 | i += 8; | |
840 | move((int)(lno - topline), i); | |
841 | ||
842 | /* The in-between characters must be changed */ | |
843 | same = 0; | |
844 | while (scan < end) | |
845 | { | |
846 | /* is this character a match? */ | |
847 | if (scan[0] == build[0]) | |
848 | { | |
849 | same++; | |
850 | } | |
851 | else /* do we want to insert? */ | |
852 | if (scan < end - 1 && scan[1] == build[0] && (has_IC || has_IM)) | |
853 | { | |
854 | nudgecursor(same, scan, new, lno); | |
855 | same = 0; | |
856 | ||
857 | insch(*scan); | |
858 | for (shift = old + COLS; --shift > build; ) | |
859 | { | |
860 | shift[0] = shift[-1]; | |
861 | } | |
862 | *build = *scan; | |
863 | } | |
864 | else /* do we want to delete? */ | |
865 | if (build < old + COLS - 1 && scan[0] == build[1] && has_DC) | |
866 | { | |
867 | nudgecursor(same, scan, new, lno); | |
868 | same = 0; | |
869 | ||
870 | delch(); | |
871 | same++; | |
872 | for (shift = build; shift < old + COLS - 1; shift++) | |
873 | { | |
874 | shift[0] = shift[1]; | |
875 | } | |
876 | if (*o_number) | |
877 | shift -= 8; | |
878 | *shift = ' '; | |
879 | } | |
880 | else /* we must overwrite */ | |
881 | { | |
882 | nudgecursor(same, scan, new, lno); | |
883 | same = 0; | |
884 | ||
885 | addch(*scan); | |
886 | *build = *scan; | |
887 | } | |
888 | ||
889 | build++; | |
890 | scan++; | |
891 | } | |
892 | ||
893 | /* maybe clear to EOL */ | |
894 | end = old + COLS - (*o_number ? 8 : 0); | |
895 | while (build < end && *build == ' ') | |
896 | { | |
897 | build++; | |
898 | } | |
899 | if (build < end) | |
900 | { | |
901 | nudgecursor(same, scan, new, lno); | |
902 | same = 0; | |
903 | ||
904 | clrtoeol(); | |
905 | while (build < old + COLS) | |
906 | { | |
907 | *build++ = ' '; | |
908 | } | |
909 | } | |
910 | #endif /* not CRUNCH */ | |
911 | } | |
912 | ||
913 | ||
914 | /* This function is used in visual mode for drawing the screen (or just parts | |
915 | * of the screen, if that's all thats needed). It also takes care of | |
916 | * scrolling. | |
917 | */ | |
918 | void redraw(curs, inputting) | |
919 | MARK curs; /* where to leave the screen's cursor */ | |
920 | int inputting; /* boolean: being called from input() ? */ | |
921 | { | |
922 | char *text; /* a line of text to display */ | |
923 | static long chgs; /* previous changes level */ | |
924 | long l; | |
925 | int i; | |
926 | #ifndef CRUNCH | |
927 | static long showtop; /* top line in window */ | |
928 | static long showbottom; /* bottom line in window */ | |
929 | #endif | |
930 | ||
931 | /* if curs == MARK_UNSET, then we should reset internal vars */ | |
932 | if (curs == MARK_UNSET) | |
933 | { | |
934 | if (topline < 1 || topline > nlines) | |
935 | { | |
936 | topline = 1L; | |
937 | } | |
938 | else | |
939 | { | |
940 | move(LINES - 1, 0); | |
941 | clrtoeol(); | |
942 | } | |
943 | leftcol = 0; | |
944 | mustredraw = TRUE; | |
945 | redrawafter = INFINITY; | |
946 | preredraw = 0L; | |
947 | postredraw = 0L; | |
948 | chgs = 0; | |
949 | smartlno = 0L; | |
950 | #ifndef NO_VISIBLE | |
951 | vizlow = vizhigh = 0L; | |
952 | vizchange = FALSE; | |
953 | #endif | |
954 | #ifndef CRUNCH | |
955 | showtop = 0; | |
956 | showbottom = INFINITY; | |
957 | #endif | |
958 | return; | |
959 | } | |
960 | ||
961 | #ifndef NO_VISIBLE | |
962 | /* adjustments to hilited area may force extra lines to be redrawn. */ | |
963 | setviz(curs); | |
964 | #endif | |
965 | ||
966 | /* figure out which column the cursor will be in */ | |
967 | l = markline(curs); | |
968 | text = fetchline(l); | |
969 | mark2phys(curs, text, inputting); | |
970 | ||
971 | #ifndef NO_COLOR | |
972 | fixcolor(); | |
973 | #endif | |
974 | ||
975 | /* adjust topline, if necessary, to get the cursor on the screen */ | |
976 | if (l >= topline && l <= botline) | |
977 | { | |
978 | /* it is on the screen already */ | |
979 | ||
980 | /* if the file was changed but !mustredraw, then redraw line */ | |
981 | if (!mustredraw && (chgs != changes | |
982 | #ifndef NO_VISIBLE | |
983 | || V_from | |
984 | #endif | |
985 | #ifndef CRUNCH | |
986 | || l < showtop || l > showbottom | |
987 | #endif | |
988 | )) | |
989 | { | |
990 | smartdrawtext(text, l, (chgs != changes)); | |
991 | } | |
992 | } | |
78ed81a3 | 993 | else if (l < topline && l >= topline - NEAR && (has_SR || has_AL)) |
15637ed4 RG |
994 | { |
995 | /* near top - scroll down */ | |
996 | if (!mustredraw) | |
997 | { | |
998 | move(0,0); | |
999 | while (l < topline) | |
1000 | { | |
1001 | topline--; | |
1002 | if (has_SR) | |
1003 | { | |
1004 | do_SR(); | |
1005 | } | |
1006 | else | |
1007 | { | |
1008 | insertln(); | |
1009 | } | |
1010 | text = fetchline(topline); | |
1011 | drawtext(text, topline, FALSE); | |
1012 | do_UP(); | |
1013 | } | |
1014 | ||
1015 | /* blank out the last line */ | |
1016 | move(LINES - 1, 0); | |
1017 | clrtoeol(); | |
1018 | } | |
1019 | else | |
1020 | { | |
1021 | topline = l; | |
1022 | redrawrange(0L, INFINITY, INFINITY); | |
1023 | } | |
1024 | } | |
78ed81a3 | 1025 | else if (l > topline && l <= botline + NEAR) |
15637ed4 RG |
1026 | { |
1027 | /* near bottom -- scroll up */ | |
1028 | if (!mustredraw) | |
1029 | { | |
1030 | move(LINES - 1,0); | |
1031 | clrtoeol(); | |
1032 | while (l > botline) | |
1033 | { | |
1034 | topline++; /* <-- also adjusts botline */ | |
1035 | text = fetchline(botline); | |
1036 | drawtext(text, botline, FALSE); | |
1037 | } | |
1038 | #ifndef CRUNCH | |
1039 | showbottom = l; | |
1040 | #endif | |
1041 | } | |
1042 | else | |
1043 | { | |
1044 | topline = l - (LINES - 2); | |
1045 | redrawrange(0L, INFINITY, INFINITY); | |
1046 | } | |
1047 | } | |
1048 | else | |
1049 | { | |
1050 | /* distant line - center it & force a redraw */ | |
78ed81a3 | 1051 | topline = l - (LINES - 1) / 2; |
15637ed4 RG |
1052 | if (topline < 1) |
1053 | { | |
1054 | topline = 1; | |
1055 | } | |
1056 | redrawrange(0L, INFINITY, INFINITY); | |
78ed81a3 | 1057 | smartlno = 0L; |
15637ed4 RG |
1058 | changes++; |
1059 | } | |
1060 | ||
1061 | #ifndef CRUNCH | |
1062 | /* make sure the current line is included in the "window" */ | |
1063 | if (l < showtop) | |
1064 | { | |
1065 | redrawrange(l, showtop, showtop); | |
1066 | showtop = l; | |
1067 | } | |
1068 | if (l > showbottom) | |
1069 | { | |
1070 | redrawrange(showbottom, l, l); | |
1071 | showbottom = l; | |
1072 | } | |
1073 | #endif | |
1074 | ||
1075 | ||
1076 | /* Now... do we really have to redraw? */ | |
1077 | if (mustredraw) | |
1078 | { | |
1079 | /* If redrawfter (and friends) aren't set, assume we should | |
1080 | * redraw everything. | |
1081 | */ | |
1082 | if (redrawafter == INFINITY) | |
1083 | { | |
1084 | redrawafter = 0L; | |
1085 | preredraw = postredraw = INFINITY; | |
1086 | } | |
1087 | ||
1088 | #ifndef CRUNCH | |
1089 | /* shrink the window, if possible */ | |
1090 | if (showtop < topline) | |
1091 | { | |
1092 | showtop = topline; | |
1093 | } | |
1094 | if (showbottom > botline) | |
1095 | { | |
1096 | showbottom = botline; | |
1097 | } | |
1098 | if (postredraw == INFINITY) | |
1099 | { | |
1100 | /* these will be set to more reasonable values later */ | |
1101 | showtop = INFINITY; | |
1102 | showbottom = 0L; | |
1103 | } | |
1104 | #endif | |
1105 | ||
1106 | /* adjust smartlno to correspond with inserted/deleted lines */ | |
1107 | if (smartlno >= redrawafter) | |
1108 | { | |
1109 | if (smartlno < preredraw && postredraw != preredraw) /*!!!*/ | |
1110 | { | |
1111 | smartlno = 0L; | |
1112 | } | |
1113 | else | |
1114 | { | |
1115 | smartlno += (postredraw - preredraw); | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | /* should we insert some lines into the screen? */ | |
1120 | if (preredraw < postredraw && preredraw <= botline) | |
1121 | { | |
1122 | /* lines were inserted into the file */ | |
1123 | ||
1124 | /* decide where insertion should start */ | |
1125 | if (preredraw < topline) | |
1126 | { | |
1127 | l = topline; | |
1128 | } | |
1129 | else | |
1130 | { | |
1131 | l = preredraw; | |
1132 | } | |
1133 | ||
1134 | /* insert the lines... maybe */ | |
1135 | if (l + postredraw - preredraw > botline || !has_AL || *o_number) | |
1136 | { | |
1137 | /* Whoa! a whole screen full - just redraw */ | |
1138 | preredraw = postredraw = INFINITY; | |
1139 | } | |
1140 | else | |
1141 | { | |
1142 | /* really insert 'em */ | |
1143 | move((int)(l - topline), 0); | |
1144 | for (i = postredraw - preredraw; i > 0; i--) | |
1145 | { | |
1146 | insertln(); | |
1147 | } | |
1148 | ||
1149 | /* NOTE: the contents of those lines will be | |
1150 | * drawn as part of the regular redraw loop. | |
1151 | */ | |
1152 | ||
1153 | /* clear the last line */ | |
1154 | move(LINES - 1, 0); | |
1155 | clrtoeol(); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* do we want to delete some lines from the screen? */ | |
1160 | if (preredraw > postredraw && postredraw <= botline) | |
1161 | { | |
1162 | if (preredraw > botline || !has_DL || *o_number) | |
1163 | { | |
1164 | postredraw = preredraw = INFINITY; | |
1165 | } | |
1166 | else /* we'd best delete some lines from the screen */ | |
1167 | { | |
1168 | /* clear the last line, so it doesn't look | |
1169 | * ugly as it gets pulled up into the screen | |
1170 | */ | |
1171 | move(LINES - 1, 0); | |
1172 | clrtoeol(); | |
1173 | ||
1174 | /* delete the lines */ | |
1175 | move((int)(postredraw - topline), 0); | |
1176 | for (l = postredraw; | |
1177 | l < preredraw && l <= botline; | |
1178 | l++) | |
1179 | { | |
1180 | deleteln(); | |
1181 | } | |
1182 | ||
1183 | /* draw the lines that are now newly visible | |
1184 | * at the bottom of the screen | |
1185 | */ | |
1186 | i = LINES - 1 + (postredraw - preredraw); | |
1187 | move(i, 0); | |
1188 | for (l = topline + i; l <= botline; l++) | |
1189 | { | |
1190 | /* clear this line */ | |
1191 | clrtoeol(); | |
1192 | ||
1193 | /* draw the line, or ~ for non-lines */ | |
1194 | if (l <= nlines) | |
1195 | { | |
1196 | text = fetchline(l); | |
1197 | drawtext(text, l, FALSE); | |
1198 | } | |
1199 | else | |
1200 | { | |
1201 | addstr("~\n"); | |
1202 | } | |
1203 | } | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | /* redraw the current line */ | |
1208 | l = markline(curs); | |
1209 | pfetch(l); | |
1210 | smartdrawtext(ptext, l, TRUE); | |
1211 | ||
1212 | #ifndef CRUNCH | |
1213 | /* decide which lines must be in the "window" around the cursor */ | |
1214 | l = markline(curs); | |
1215 | if ((*o_window & 0xff) + 1 == LINES) | |
1216 | { | |
1217 | showtop = 1; | |
1218 | showbottom = INFINITY; | |
1219 | } | |
1220 | else if (l < showtop || l > showbottom) | |
1221 | { | |
1222 | l -= (*o_window & 0xff) / 2; | |
1223 | if (l < topline) | |
1224 | { | |
1225 | l = topline; | |
1226 | } | |
1227 | if (l < showtop) | |
1228 | { | |
1229 | showtop = l; | |
1230 | } | |
1231 | l += (*o_window & 0xff) - 1; | |
1232 | if (l > botline) | |
1233 | { | |
1234 | showtop = showtop - l + botline; | |
1235 | l = botline; | |
1236 | } | |
1237 | if (l > showbottom) | |
1238 | { | |
1239 | showbottom = l; | |
1240 | } | |
1241 | } | |
1242 | #endif | |
1243 | ||
1244 | /* decide where we should start redrawing from */ | |
1245 | if (redrawafter < topline) | |
1246 | { | |
1247 | l = topline; | |
1248 | } | |
1249 | else | |
1250 | { | |
1251 | l = redrawafter; | |
1252 | } | |
1253 | if (l <= botline && l < postredraw && (l != smartlno || botline != smartlno)) | |
1254 | { | |
1255 | /* draw the other lines */ | |
1256 | move((int)(l - topline), 0); | |
1257 | for (; l <= botline && l < postredraw; l++) | |
1258 | { | |
1259 | /* we already drew the current line, so skip it now */ | |
1260 | if (l == smartlno) | |
1261 | { | |
1262 | #if OSK | |
1263 | qaddch('\l'); | |
1264 | #else | |
1265 | qaddch('\n'); | |
1266 | #endif | |
1267 | continue; | |
1268 | } | |
1269 | ||
1270 | /* draw the line, or ~ for non-lines */ | |
1271 | if (l > nlines) | |
1272 | { | |
1273 | qaddch('~'); | |
1274 | clrtoeol(); | |
1275 | addch('\n'); | |
1276 | } | |
1277 | #ifndef CRUNCH | |
1278 | else if (l < showtop || l > showbottom) | |
1279 | { | |
1280 | qaddch('@'); | |
1281 | clrtoeol(); | |
1282 | addch('\n'); | |
1283 | } | |
1284 | #endif | |
1285 | else | |
1286 | { | |
1287 | text = fetchline(l); | |
1288 | drawtext(text, l, TRUE); | |
1289 | } | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | mustredraw = FALSE; | |
1294 | } | |
1295 | ||
1296 | /* force total (non-partial) redraw next time if not set */ | |
1297 | redrawafter = INFINITY; | |
1298 | preredraw = 0L; | |
1299 | postredraw = 0L; | |
1300 | ||
1301 | /* move the cursor to where it belongs */ | |
1302 | move((int)(markline(curs) - topline), physcol); | |
1303 | wqrefresh(); | |
1304 | ||
1305 | chgs = changes; | |
1306 | } |