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1 | /*- |
2 | * Copyright (c) 1980 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.proprietary.c% | |
f9679f70 DF |
6 | */ |
7 | ||
8 | #ifndef lint | |
2791ff57 KB |
9 | static char sccsid[] = "@(#)ex_vwind.c 7.5 (Berkeley) %G%"; |
10 | #endif /* not lint */ | |
f9679f70 | 11 | |
d31bedb7 MH |
12 | #include "ex.h" |
13 | #include "ex_tty.h" | |
14 | #include "ex_vis.h" | |
15 | ||
16 | /* | |
17 | * Routines to adjust the window, showing specified lines | |
18 | * in certain positions on the screen, and scrolling in both | |
19 | * directions. Code here is very dependent on mode (open versus visual). | |
20 | */ | |
21 | ||
22 | /* | |
23 | * Move in a nonlocal way to line addr. | |
24 | * If it isn't on screen put it in specified context. | |
25 | * New position for cursor is curs. | |
26 | * Like most routines here, we vsave(). | |
27 | */ | |
28 | vmoveto(addr, curs, context) | |
29 | register line *addr; | |
30 | char *curs; | |
31 | char context; | |
32 | { | |
33 | ||
34 | markit(addr); | |
35 | vsave(); | |
36 | vjumpto(addr, curs, context); | |
37 | } | |
38 | ||
39 | /* | |
40 | * Vjumpto is like vmoveto, but doesn't mark previous | |
41 | * context or save linebuf as current line. | |
42 | */ | |
43 | vjumpto(addr, curs, context) | |
44 | register line *addr; | |
45 | char *curs; | |
46 | char context; | |
47 | { | |
48 | ||
5a6c967e | 49 | ignore(noteit(0)); |
d31bedb7 MH |
50 | if (context != 0) |
51 | vcontext(addr, context); | |
52 | else | |
53 | vshow(addr, NOLINE); | |
5a6c967e | 54 | ignore(noteit(1)); |
d31bedb7 MH |
55 | vnline(curs); |
56 | } | |
57 | ||
58 | /* | |
59 | * Go up or down cnt (negative is up) to new position curs. | |
60 | */ | |
61 | vupdown(cnt, curs) | |
62 | register int cnt; | |
63 | char *curs; | |
64 | { | |
65 | ||
66 | if (cnt > 0) | |
67 | vdown(cnt, 0, 0); | |
68 | else if (cnt < 0) | |
69 | vup(-cnt, 0, 0); | |
70 | if (vcnt == 0) | |
71 | vrepaint(curs); | |
72 | else | |
73 | vnline(curs); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Go up cnt lines, afterwards preferring to be ind | |
78 | * logical lines from the top of the screen. | |
79 | * If scroll, then we MUST use a scroll. | |
80 | * Otherwise clear and redraw if motion is far. | |
81 | */ | |
82 | vup(cnt, ind, scroll) | |
83 | register int cnt, ind; | |
84 | bool scroll; | |
85 | { | |
86 | register int i, tot; | |
87 | ||
88 | if (dot == one) { | |
89 | beep(); | |
90 | return; | |
91 | } | |
92 | vsave(); | |
93 | i = lineDOT() - 1; | |
94 | if (cnt > i) { | |
95 | ind -= cnt - i; | |
96 | if (ind < 0) | |
97 | ind = 0; | |
98 | cnt = i; | |
99 | } | |
100 | if (!scroll && cnt <= vcline) { | |
101 | vshow(dot - cnt, NOLINE); | |
102 | return; | |
103 | } | |
104 | cnt -= vcline, dot -= vcline, vcline = 0; | |
105 | if (hold & HOLDWIG) | |
106 | goto contxt; | |
107 | if (state == VISUAL && !AL && !SR && | |
5a6c967e | 108 | cnt <= WTOP - ex_ZERO && vfit(dot - cnt, cnt) <= WTOP - ex_ZERO) |
d31bedb7 | 109 | goto okr; |
5a6c967e | 110 | tot = WECHO - ex_ZERO; |
d31bedb7 MH |
111 | if (state != VISUAL || (!AL && !SR) || (!scroll && (cnt > tot || vfit(dot - cnt, cnt) > tot / 3 + 1))) { |
112 | if (ind > basWLINES / 2) | |
113 | ind = basWLINES / 3; | |
114 | contxt: | |
115 | vcontext(dot + ind - cnt, '.'); | |
116 | return; | |
117 | } | |
118 | okr: | |
119 | vrollR(cnt); | |
120 | if (scroll) { | |
121 | vcline += ind, dot += ind; | |
122 | if (vcline >= vcnt) | |
123 | dot -= vcline - vcnt + 1, vcline = vcnt - 1; | |
124 | getDOT(); | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * Like vup, but scrolling down. | |
130 | */ | |
131 | vdown(cnt, ind, scroll) | |
132 | register int cnt, ind; | |
133 | bool scroll; | |
134 | { | |
135 | register int i, tot; | |
136 | ||
137 | if (dot == dol) { | |
138 | beep(); | |
139 | return; | |
140 | } | |
141 | vsave(); | |
142 | i = dol - dot; | |
143 | if (cnt > i) { | |
144 | ind -= cnt - i; | |
145 | if (ind < 0) | |
146 | ind = 0; | |
147 | cnt = i; | |
148 | } | |
149 | i = vcnt - vcline - 1; | |
150 | if (!scroll && cnt <= i) { | |
151 | vshow(dot + cnt, NOLINE); | |
152 | return; | |
153 | } | |
154 | cnt -= i, dot += i, vcline += i; | |
155 | if (hold & HOLDWIG) | |
156 | goto dcontxt; | |
157 | if (!scroll) { | |
5a6c967e | 158 | tot = WECHO - ex_ZERO; |
d31bedb7 MH |
159 | if (state != VISUAL || cnt - tot > 0 || vfit(dot, cnt) > tot / 3 + 1) { |
160 | dcontxt: | |
161 | vcontext(dot + cnt, '.'); | |
162 | return; | |
163 | } | |
164 | } | |
165 | if (cnt > 0) | |
166 | vroll(cnt); | |
167 | if (state == VISUAL && scroll) { | |
168 | vcline -= ind, dot -= ind; | |
169 | if (vcline < 0) | |
170 | dot -= vcline, vcline = 0; | |
171 | getDOT(); | |
172 | } | |
173 | } | |
174 | ||
175 | /* | |
176 | * Show line addr in context where on the screen. | |
177 | * Work here is in determining new top line implied by | |
178 | * this placement of line addr, since we always draw from the top. | |
179 | */ | |
180 | vcontext(addr, where) | |
181 | register line *addr; | |
182 | char where; | |
183 | { | |
184 | register line *top; | |
185 | ||
186 | getline(*addr); | |
187 | if (state != VISUAL) | |
188 | top = addr; | |
189 | else switch (where) { | |
190 | ||
191 | case '^': | |
192 | addr = vback(addr, basWLINES - vdepth()); | |
193 | getline(*addr); | |
194 | /* fall into ... */ | |
195 | ||
196 | case '-': | |
197 | top = vback(addr, basWLINES - vdepth()); | |
198 | getline(*addr); | |
199 | break; | |
200 | ||
201 | case '.': | |
202 | top = vback(addr, basWLINES / 2 - vdepth()); | |
203 | getline(*addr); | |
204 | break; | |
205 | ||
206 | default: | |
207 | top = addr; | |
208 | break; | |
209 | } | |
210 | if (state == ONEOPEN && LINE(0) == WBOT) | |
211 | vup1(); | |
212 | vcnt = vcline = 0; | |
213 | vclean(); | |
214 | if (state == CRTOPEN) | |
215 | vup1(); | |
216 | vshow(addr, top); | |
217 | } | |
218 | ||
219 | /* | |
220 | * Get a clean line. If we are in a hard open | |
221 | * we may be able to reuse the line we are on | |
222 | * if it is blank. This is a real win. | |
223 | */ | |
224 | vclean() | |
225 | { | |
226 | ||
227 | if (state != VISUAL && state != CRTOPEN) { | |
228 | destcol = 0; | |
229 | if (!ateopr()) | |
230 | vup1(); | |
231 | vcnt = 0; | |
232 | } | |
233 | } | |
234 | ||
235 | /* | |
236 | * Show line addr with the specified top line on the screen. | |
237 | * Top may be 0; in this case have vcontext compute the top | |
238 | * (and call us recursively). Eventually, we clear the screen | |
239 | * (or its open mode equivalent) and redraw. | |
240 | */ | |
241 | vshow(addr, top) | |
242 | line *addr, *top; | |
243 | { | |
244 | #ifndef CBREAK | |
245 | register bool fried = 0; | |
246 | #endif | |
247 | register int cnt = addr - dot; | |
248 | register int i = vcline + cnt; | |
249 | short oldhold = hold; | |
250 | ||
251 | if (state != HARDOPEN && state != ONEOPEN && i >= 0 && i < vcnt) { | |
252 | dot = addr; | |
253 | getDOT(); | |
254 | vcline = i; | |
255 | return; | |
256 | } | |
257 | if (state != VISUAL) { | |
258 | dot = addr; | |
259 | vopen(dot, WBOT); | |
260 | return; | |
261 | } | |
262 | if (top == 0) { | |
263 | vcontext(addr, '.'); | |
264 | return; | |
265 | } | |
266 | dot = top; | |
267 | #ifndef CBREAK | |
268 | if (vcookit(2)) | |
269 | fried++, vcook(); | |
270 | #endif | |
271 | oldhold = hold; | |
272 | hold |= HOLDAT; | |
273 | vclear(); | |
274 | vreset(0); | |
275 | vredraw(WTOP); | |
276 | /* error if vcline >= vcnt ! */ | |
277 | vcline = addr - top; | |
278 | dot = addr; | |
279 | getDOT(); | |
280 | hold = oldhold; | |
281 | vsync(LASTLINE); | |
282 | #ifndef CBREAK | |
283 | if (fried) | |
284 | flusho(), vraw(); | |
285 | #endif | |
286 | } | |
287 | ||
288 | /* | |
289 | * reset the state. | |
290 | * If inecho then leave us at the beginning of the echo | |
291 | * area; we are called this way in the middle of a :e escape | |
292 | * from visual, e.g. | |
293 | */ | |
294 | vreset(inecho) | |
295 | bool inecho; | |
296 | { | |
297 | ||
298 | vcnt = vcline = 0; | |
299 | WTOP = basWTOP; | |
300 | WLINES = basWLINES; | |
301 | if (inecho) | |
302 | splitw = 1, vgoto(WECHO, 0); | |
303 | } | |
304 | ||
305 | /* | |
306 | * Starting from which line preceding tp uses almost (but not more | |
307 | * than) cnt physical lines? | |
308 | */ | |
309 | line * | |
310 | vback(tp, cnt) | |
311 | register int cnt; | |
312 | register line *tp; | |
313 | { | |
314 | register int d; | |
315 | ||
316 | if (cnt > 0) | |
317 | for (; tp > one; tp--) { | |
318 | getline(tp[-1]); | |
319 | d = vdepth(); | |
320 | if (d > cnt) | |
321 | break; | |
322 | cnt -= d; | |
323 | } | |
324 | return (tp); | |
325 | } | |
326 | ||
327 | /* | |
328 | * How much scrolling will it take to roll cnt lines starting at tp? | |
329 | */ | |
330 | vfit(tp, cnt) | |
331 | register line *tp; | |
332 | int cnt; | |
333 | { | |
334 | register int j; | |
335 | ||
336 | j = 0; | |
337 | while (cnt > 0) { | |
338 | cnt--; | |
339 | getline(tp[cnt]); | |
340 | j += vdepth(); | |
341 | } | |
342 | if (tp > dot) | |
343 | j -= WBOT - LASTLINE; | |
344 | return (j); | |
345 | } | |
346 | ||
347 | /* | |
348 | * Roll cnt lines onto the screen. | |
349 | */ | |
350 | vroll(cnt) | |
351 | register int cnt; | |
352 | { | |
353 | #ifndef CBREAK | |
354 | register bool fried = 0; | |
355 | #endif | |
356 | short oldhold = hold; | |
357 | ||
358 | #ifdef ADEBUG | |
359 | if (trace) | |
360 | tfixnl(), fprintf(trace, "vroll(%d)\n", cnt); | |
361 | #endif | |
362 | if (state != VISUAL) | |
363 | hold |= HOLDAT|HOLDROL; | |
364 | if (WBOT == WECHO) { | |
365 | vcnt = 0; | |
366 | if (state == ONEOPEN) | |
367 | vup1(); | |
368 | } | |
369 | #ifndef CBREAK | |
370 | if (vcookit(cnt)) | |
371 | fried++, vcook(); | |
372 | #endif | |
5a6c967e | 373 | for (; cnt > 0 && Peek_key != ATTN; cnt--) { |
d31bedb7 MH |
374 | dot++, vcline++; |
375 | vopen(dot, LASTLINE); | |
376 | vscrap(); | |
377 | } | |
378 | hold = oldhold; | |
379 | if (state == HARDOPEN) | |
380 | sethard(); | |
381 | vsyncCL(); | |
382 | #ifndef CBREAK | |
383 | if (fried) | |
384 | flusho(), vraw(); | |
385 | #endif | |
386 | } | |
387 | ||
388 | /* | |
389 | * Roll backwards (scroll up). | |
390 | */ | |
391 | vrollR(cnt) | |
392 | register int cnt; | |
393 | { | |
d31bedb7 MH |
394 | short oldhold = hold; |
395 | ||
396 | #ifdef ADEBUG | |
397 | if (trace) | |
398 | tfixnl(), fprintf(trace, "vrollR(%d), dot=%d\n", cnt, lineDOT()); | |
399 | #endif | |
400 | #ifndef CBREAK | |
401 | if (vcookit(cnt)) | |
402 | fried++, vcook(); | |
403 | #endif | |
404 | if (WBOT == WECHO) | |
405 | vcnt = 0; | |
406 | heldech = 0; | |
407 | hold |= HOLDAT|HOLDECH; | |
5a6c967e | 408 | for (; cnt > 0 && Peek_key != ATTN; cnt--) { |
d31bedb7 MH |
409 | dot--; |
410 | vopen(dot, WTOP); | |
411 | vscrap(); | |
412 | } | |
413 | hold = oldhold; | |
414 | if (heldech) | |
415 | vclrech(0); | |
416 | vsync(LINE(vcnt-1)); | |
417 | #ifndef CBREAK | |
418 | if (fried) | |
419 | flusho(), vraw(); | |
420 | #endif | |
421 | } | |
422 | ||
423 | /* | |
424 | * Go into cooked mode (allow interrupts) during | |
425 | * a scroll if we are at less than 1200 baud and not | |
426 | * a 'vi' command, of if we are in a 'vi' command and the | |
427 | * scroll is more than 2 full screens. | |
428 | * | |
429 | * BUG: An interrupt during a scroll in this way | |
430 | * dumps to command mode. | |
431 | */ | |
432 | vcookit(cnt) | |
433 | register int cnt; | |
434 | { | |
435 | ||
436 | return (cnt > 1 && (ospeed < B1200 && !initev || cnt > LINES * 2)); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Determine displayed depth of current line. | |
441 | */ | |
442 | vdepth() | |
443 | { | |
444 | register int d; | |
445 | ||
5a6c967e | 446 | d = (column(NOSTR) + WCOLS - 1 + (Put_char == listchar) + IN) / WCOLS; |
d31bedb7 MH |
447 | #ifdef ADEBUG |
448 | if (trace) | |
449 | tfixnl(), fprintf(trace, "vdepth returns %d\n", d == 0 ? 1 : d); | |
450 | #endif | |
451 | return (d == 0 ? 1 : d); | |
452 | } | |
453 | ||
454 | /* | |
455 | * Move onto a new line, with cursor at position curs. | |
456 | */ | |
457 | vnline(curs) | |
458 | char *curs; | |
459 | { | |
460 | ||
461 | if (curs) | |
462 | wcursor = curs; | |
463 | else if (vmoving) | |
464 | wcursor = vfindcol(vmovcol); | |
465 | else | |
466 | wcursor = vskipwh(linebuf); | |
467 | cursor = linebuf; | |
468 | vmove(); | |
469 | } |