Annotation of src/usr.bin/tmux/screen.c, Revision 1.68
1.68 ! nicm 1: /* $OpenBSD: screen.c,v 1.67 2020/05/16 15:49:20 nicm Exp $ */
1.1 nicm 2:
3: /*
1.37 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
1.3 nicm 21: #include <stdlib.h>
1.1 nicm 22: #include <string.h>
1.16 nicm 23: #include <unistd.h>
1.47 nicm 24: #include <vis.h>
1.1 nicm 25:
26: #include "tmux.h"
27:
1.52 nicm 28: /* Selected area in screen. */
29: struct screen_sel {
30: int hidden;
31: int rectangle;
32: int modekeys;
33:
34: u_int sx;
35: u_int sy;
36:
37: u_int ex;
38: u_int ey;
39:
40: struct grid_cell cell;
41: };
42:
43: /* Entry on title stack. */
1.48 nicm 44: struct screen_title_entry {
45: char *text;
46:
47: TAILQ_ENTRY(screen_title_entry) entry;
48: };
49: TAILQ_HEAD(screen_titles, screen_title_entry);
50:
1.66 nicm 51: static void screen_resize_y(struct screen *, u_int, int, u_int *);
1.67 nicm 52: static void screen_reflow(struct screen *, u_int, u_int *, u_int *, int);
1.42 nicm 53:
1.48 nicm 54: /* Free titles stack. */
55: static void
56: screen_free_titles(struct screen *s)
57: {
58: struct screen_title_entry *title_entry;
59:
60: if (s->titles == NULL)
61: return;
62:
63: while ((title_entry = TAILQ_FIRST(s->titles)) != NULL) {
64: TAILQ_REMOVE(s->titles, title_entry, entry);
65: free(title_entry->text);
66: free(title_entry);
67: }
68:
69: free(s->titles);
70: s->titles = NULL;
71: }
72:
1.1 nicm 73: /* Create a new screen. */
74: void
75: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
76: {
77: s->grid = grid_create(sx, sy, hlimit);
1.59 nicm 78: s->saved_grid = NULL;
79:
1.34 nicm 80: s->title = xstrdup("");
1.48 nicm 81: s->titles = NULL;
1.68 ! nicm 82: s->path = NULL;
1.1 nicm 83:
1.21 nicm 84: s->cstyle = 0;
1.20 nicm 85: s->ccolour = xstrdup("");
1.3 nicm 86: s->tabs = NULL;
1.52 nicm 87: s->sel = NULL;
1.3 nicm 88:
1.64 nicm 89: s->write_list = NULL;
90:
1.1 nicm 91: screen_reinit(s);
92: }
93:
94: /* Reinitialise screen. */
95: void
96: screen_reinit(struct screen *s)
97: {
98: s->cx = 0;
99: s->cy = 0;
100:
101: s->rupper = 0;
102: s->rlower = screen_size_y(s) - 1;
103:
1.16 nicm 104: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 105:
1.59 nicm 106: if (s->saved_grid != NULL)
107: screen_alternate_off(s, NULL, 0);
108: s->saved_cx = UINT_MAX;
109: s->saved_cy = UINT_MAX;
110:
1.3 nicm 111: screen_reset_tabs(s);
1.1 nicm 112:
1.44 nicm 113: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
1.1 nicm 114:
115: screen_clear_selection(s);
1.48 nicm 116: screen_free_titles(s);
1.1 nicm 117: }
118:
119: /* Destroy a screen. */
120: void
121: screen_free(struct screen *s)
122: {
1.52 nicm 123: free(s->sel);
1.23 nicm 124: free(s->tabs);
1.68 ! nicm 125: free(s->path);
1.23 nicm 126: free(s->title);
127: free(s->ccolour);
1.48 nicm 128:
1.64 nicm 129: if (s->write_list != NULL)
130: screen_write_free_list(s);
131:
1.59 nicm 132: if (s->saved_grid != NULL)
133: grid_destroy(s->saved_grid);
1.1 nicm 134: grid_destroy(s->grid);
1.48 nicm 135:
136: screen_free_titles(s);
1.1 nicm 137: }
138:
1.3 nicm 139: /* Reset tabs to default, eight spaces apart. */
140: void
141: screen_reset_tabs(struct screen *s)
142: {
143: u_int i;
144:
1.23 nicm 145: free(s->tabs);
1.3 nicm 146:
147: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
148: fatal("bit_alloc failed");
149: for (i = 8; i < screen_size_x(s); i += 8)
150: bit_set(s->tabs, i);
1.21 nicm 151: }
152:
153: /* Set screen cursor style. */
154: void
155: screen_set_cursor_style(struct screen *s, u_int style)
156: {
1.22 nicm 157: if (style <= 6)
1.21 nicm 158: s->cstyle = style;
1.20 nicm 159: }
160:
161: /* Set screen cursor colour. */
162: void
1.36 nicm 163: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 164: {
1.23 nicm 165: free(s->ccolour);
1.36 nicm 166: s->ccolour = xstrdup(colour);
1.3 nicm 167: }
168:
1.1 nicm 169: /* Set screen title. */
1.57 nicm 170: int
1.1 nicm 171: screen_set_title(struct screen *s, const char *title)
172: {
1.57 nicm 173: if (!utf8_isvalid(title))
174: return (0);
1.23 nicm 175: free(s->title);
1.57 nicm 176: s->title = xstrdup(title);
177: return (1);
1.56 nicm 178: }
179:
180: /* Set screen path. */
181: void
182: screen_set_path(struct screen *s, const char *path)
183: {
184: free(s->path);
185: utf8_stravis(&s->path, path, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
1.48 nicm 186: }
187:
188: /* Push the current title onto the stack. */
189: void
190: screen_push_title(struct screen *s)
191: {
192: struct screen_title_entry *title_entry;
193:
194: if (s->titles == NULL) {
195: s->titles = xmalloc(sizeof *s->titles);
196: TAILQ_INIT(s->titles);
197: }
198: title_entry = xmalloc(sizeof *title_entry);
199: title_entry->text = xstrdup(s->title);
200: TAILQ_INSERT_HEAD(s->titles, title_entry, entry);
201: }
202:
203: /*
204: * Pop a title from the stack and set it as the screen title. If the stack is
205: * empty, do nothing.
206: */
207: void
208: screen_pop_title(struct screen *s)
209: {
210: struct screen_title_entry *title_entry;
211:
212: if (s->titles == NULL)
213: return;
214:
215: title_entry = TAILQ_FIRST(s->titles);
216: if (title_entry != NULL) {
217: screen_set_title(s, title_entry->text);
218:
219: TAILQ_REMOVE(s->titles, title_entry, entry);
220: free(title_entry->text);
221: free(title_entry);
222: }
1.1 nicm 223: }
224:
1.67 nicm 225: /* Resize screen with options. */
1.1 nicm 226: void
1.62 nicm 227: screen_resize_cursor(struct screen *s, u_int sx, u_int sy, int reflow,
1.67 nicm 228: int eat_empty, int cursor)
1.1 nicm 229: {
1.67 nicm 230: u_int cx = s->cx, cy = s->grid->hsize + s->cy;
1.64 nicm 231:
1.65 nicm 232: if (s->write_list != NULL)
1.64 nicm 233: screen_write_free_list(s);
1.62 nicm 234:
1.63 nicm 235: log_debug("%s: new size %ux%u, now %ux%u (cursor %u,%u = %u,%u)",
236: __func__, sx, sy, screen_size_x(s), screen_size_y(s), s->cx, s->cy,
1.67 nicm 237: cx, cy);
1.62 nicm 238:
1.1 nicm 239: if (sx < 1)
240: sx = 1;
241: if (sy < 1)
242: sy = 1;
243:
1.3 nicm 244: if (sx != screen_size_x(s)) {
1.54 nicm 245: s->grid->sx = sx;
1.3 nicm 246: screen_reset_tabs(s);
1.49 nicm 247: } else
248: reflow = 0;
1.3 nicm 249:
1.1 nicm 250: if (sy != screen_size_y(s))
1.67 nicm 251: screen_resize_y(s, sy, eat_empty, &cy);
1.24 nicm 252:
253: if (reflow)
1.67 nicm 254: screen_reflow(s, sx, &cx, &cy, cursor);
1.62 nicm 255:
1.67 nicm 256: if (cy >= s->grid->hsize) {
257: s->cx = cx;
258: s->cy = cy - s->grid->hsize;
1.62 nicm 259: } else {
260: s->cx = 0;
261: s->cy = 0;
262: }
1.67 nicm 263:
1.63 nicm 264: log_debug("%s: cursor finished at %u,%u = %u,%u", __func__, s->cx,
1.67 nicm 265: s->cy, cx, cy);
1.65 nicm 266:
267: if (s->write_list != NULL)
268: screen_write_make_list(s);
1.62 nicm 269: }
270:
271: /* Resize screen. */
272: void
273: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
274: {
1.67 nicm 275: screen_resize_cursor(s, sx, sy, reflow, 1, 1);
1.1 nicm 276: }
277:
1.41 nicm 278: static void
1.66 nicm 279: screen_resize_y(struct screen *s, u_int sy, int eat_empty, u_int *cy)
1.1 nicm 280: {
281: struct grid *gd = s->grid;
1.4 nicm 282: u_int needed, available, oldy, i;
1.1 nicm 283:
284: if (sy == 0)
285: fatalx("zero size");
1.4 nicm 286: oldy = screen_size_y(s);
287:
1.12 nicm 288: /*
1.4 nicm 289: * When resizing:
290: *
291: * If the height is decreasing, delete lines from the bottom until
292: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 293: *
1.40 nicm 294: * When increasing, pull as many lines as possible from scrolled
295: * history (not explicitly cleared from view) to the top, then fill the
296: * remaining with blanks at the bottom.
1.4 nicm 297: */
1.1 nicm 298:
299: /* Size decreasing. */
1.4 nicm 300: if (sy < oldy) {
301: needed = oldy - sy;
1.1 nicm 302:
1.4 nicm 303: /* Delete as many lines as possible from the bottom. */
1.62 nicm 304: if (eat_empty) {
305: available = oldy - 1 - s->cy;
306: if (available > 0) {
307: if (available > needed)
308: available = needed;
309: grid_view_delete_lines(gd, oldy - available,
310: available, 8);
311: }
312: needed -= available;
1.1 nicm 313: }
314:
1.4 nicm 315: /*
1.8 nicm 316: * Now just increase the history size, if possible, to take
317: * over the lines which are left. If history is off, delete
318: * lines from the top.
1.4 nicm 319: */
1.8 nicm 320: available = s->cy;
1.40 nicm 321: if (gd->flags & GRID_HISTORY) {
322: gd->hscrolled += needed;
1.8 nicm 323: gd->hsize += needed;
1.40 nicm 324: } else if (needed > 0 && available > 0) {
1.8 nicm 325: if (available > needed)
326: available = needed;
1.44 nicm 327: grid_view_delete_lines(gd, 0, available, 8);
1.66 nicm 328: (*cy) -= available;
1.8 nicm 329: }
1.12 nicm 330: }
1.1 nicm 331:
1.51 nicm 332: /* Resize line array. */
333: grid_adjust_lines(gd, gd->hsize + sy);
1.1 nicm 334:
335: /* Size increasing. */
1.4 nicm 336: if (sy > oldy) {
337: needed = sy - oldy;
338:
1.8 nicm 339: /*
1.41 nicm 340: * Try to pull as much as possible out of scrolled history, if
341: * is is enabled.
1.8 nicm 342: */
1.40 nicm 343: available = gd->hscrolled;
1.8 nicm 344: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 345: if (available > needed)
346: available = needed;
1.40 nicm 347: gd->hscrolled -= available;
1.4 nicm 348: gd->hsize -= available;
1.8 nicm 349: } else
350: available = 0;
1.4 nicm 351: needed -= available;
352:
353: /* Then fill the rest in with blanks. */
1.11 nicm 354: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
1.61 nicm 355: grid_empty_line(gd, i, 8);
1.1 nicm 356: }
357:
1.4 nicm 358: /* Set the new size, and reset the scroll region. */
1.1 nicm 359: gd->sy = sy;
360: s->rupper = 0;
361: s->rlower = screen_size_y(s) - 1;
362: }
363:
364: /* Set selection. */
365: void
1.14 nicm 366: screen_set_selection(struct screen *s, u_int sx, u_int sy,
1.52 nicm 367: u_int ex, u_int ey, u_int rectangle, int modekeys, struct grid_cell *gc)
1.1 nicm 368: {
1.52 nicm 369: if (s->sel == NULL)
370: s->sel = xcalloc(1, sizeof *s->sel);
1.1 nicm 371:
1.52 nicm 372: memcpy(&s->sel->cell, gc, sizeof s->sel->cell);
373: s->sel->hidden = 0;
374: s->sel->rectangle = rectangle;
375: s->sel->modekeys = modekeys;
376:
377: s->sel->sx = sx;
378: s->sel->sy = sy;
379: s->sel->ex = ex;
380: s->sel->ey = ey;
1.1 nicm 381: }
382:
383: /* Clear selection. */
384: void
385: screen_clear_selection(struct screen *s)
386: {
1.52 nicm 387: free(s->sel);
388: s->sel = NULL;
1.1 nicm 389: }
390:
1.45 nicm 391: /* Hide selection. */
392: void
393: screen_hide_selection(struct screen *s)
394: {
1.52 nicm 395: if (s->sel != NULL)
396: s->sel->hidden = 1;
1.45 nicm 397: }
398:
1.1 nicm 399: /* Check if cell in selection. */
400: int
401: screen_check_selection(struct screen *s, u_int px, u_int py)
402: {
1.52 nicm 403: struct screen_sel *sel = s->sel;
1.28 nicm 404: u_int xx;
1.1 nicm 405:
1.52 nicm 406: if (sel == NULL || sel->hidden)
1.1 nicm 407: return (0);
408:
1.52 nicm 409: if (sel->rectangle) {
1.14 nicm 410: if (sel->sy < sel->ey) {
411: /* start line < end line -- downward selection. */
412: if (py < sel->sy || py > sel->ey)
413: return (0);
414: } else if (sel->sy > sel->ey) {
415: /* start line > end line -- upward selection. */
416: if (py > sel->sy || py < sel->ey)
417: return (0);
418: } else {
419: /* starting line == ending line. */
420: if (py != sel->sy)
421: return (0);
422: }
423:
424: /*
425: * Need to include the selection start row, but not the cursor
426: * row, which means the selection changes depending on which
427: * one is on the left.
428: */
429: if (sel->ex < sel->sx) {
430: /* Cursor (ex) is on the left. */
1.17 nicm 431: if (px < sel->ex)
1.14 nicm 432: return (0);
433:
434: if (px > sel->sx)
435: return (0);
436: } else {
437: /* Selection start (sx) is on the left. */
438: if (px < sel->sx)
439: return (0);
440:
1.17 nicm 441: if (px > sel->ex)
1.14 nicm 442: return (0);
443: }
444: } else {
445: /*
446: * Like emacs, keep the top-left-most character, and drop the
447: * bottom-right-most, regardless of copy direction.
448: */
449: if (sel->sy < sel->ey) {
450: /* starting line < ending line -- downward selection. */
451: if (py < sel->sy || py > sel->ey)
452: return (0);
453:
1.28 nicm 454: if (py == sel->sy && px < sel->sx)
1.29 nicm 455: return (0);
1.28 nicm 456:
1.53 nicm 457: if (sel->modekeys == MODEKEY_EMACS)
458: xx = (sel->ex == 0 ? 0 : sel->ex - 1);
459: else
460: xx = sel->ex;
461: if (py == sel->ey && px > xx)
1.14 nicm 462: return (0);
463: } else if (sel->sy > sel->ey) {
464: /* starting line > ending line -- upward selection. */
465: if (py > sel->sy || py < sel->ey)
466: return (0);
467:
1.28 nicm 468: if (py == sel->ey && px < sel->ex)
469: return (0);
470:
471: if (sel->modekeys == MODEKEY_EMACS)
472: xx = sel->sx - 1;
473: else
474: xx = sel->sx;
1.46 nicm 475: if (py == sel->sy && (sel->sx == 0 || px > xx))
1.14 nicm 476: return (0);
477: } else {
478: /* starting line == ending line. */
479: if (py != sel->sy)
480: return (0);
481:
482: if (sel->ex < sel->sx) {
483: /* cursor (ex) is on the left */
1.28 nicm 484: if (sel->modekeys == MODEKEY_EMACS)
485: xx = sel->sx - 1;
486: else
487: xx = sel->sx;
488: if (px > xx || px < sel->ex)
1.14 nicm 489: return (0);
490: } else {
491: /* selection start (sx) is on the left */
1.53 nicm 492: if (sel->modekeys == MODEKEY_EMACS)
493: xx = (sel->ex == 0 ? 0 : sel->ex - 1);
494: else
495: xx = sel->ex;
496: if (px < sel->sx || px > xx)
1.14 nicm 497: return (0);
498: }
499: }
1.1 nicm 500: }
501:
502: return (1);
1.43 nicm 503: }
504:
505: /* Get selected grid cell. */
506: void
507: screen_select_cell(struct screen *s, struct grid_cell *dst,
508: const struct grid_cell *src)
509: {
1.52 nicm 510: if (s->sel == NULL || s->sel->hidden)
1.43 nicm 511: return;
512:
1.52 nicm 513: memcpy(dst, &s->sel->cell, sizeof *dst);
1.43 nicm 514:
515: utf8_copy(&dst->data, &src->data);
516: dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
517: dst->attr |= src->attr & GRID_ATTR_CHARSET;
518: dst->flags = src->flags;
1.24 nicm 519: }
520:
521: /* Reflow wrapped lines. */
1.42 nicm 522: static void
1.67 nicm 523: screen_reflow(struct screen *s, u_int new_x, u_int *cx, u_int *cy, int cursor)
1.24 nicm 524: {
1.62 nicm 525: u_int wx, wy;
1.54 nicm 526:
1.67 nicm 527: if (cursor) {
528: grid_wrap_position(s->grid, *cx, *cy, &wx, &wy);
529: log_debug("%s: cursor %u,%u is %u,%u", __func__, *cx, *cy, wx,
530: wy);
531: }
1.54 nicm 532:
533: grid_reflow(s->grid, new_x);
534:
1.67 nicm 535: if (cursor) {
536: grid_unwrap_position(s->grid, cx, cy, wx, wy);
537: log_debug("%s: new cursor is %u,%u", __func__, *cx, *cy);
538: }
539: else {
540: *cx = 0;
541: *cy = s->grid->hsize;
542: }
1.59 nicm 543: }
544:
545: /*
546: * Enter alternative screen mode. A copy of the visible screen is saved and the
547: * history is not updated.
548: */
549: void
550: screen_alternate_on(struct screen *s, struct grid_cell *gc, int cursor)
551: {
552: u_int sx, sy;
553:
554: if (s->saved_grid != NULL)
555: return;
556: sx = screen_size_x(s);
557: sy = screen_size_y(s);
558:
559: s->saved_grid = grid_create(sx, sy, 0);
560: grid_duplicate_lines(s->saved_grid, 0, s->grid, screen_hsize(s), sy);
561: if (cursor) {
562: s->saved_cx = s->cx;
563: s->saved_cy = s->cy;
564: }
565: memcpy(&s->saved_cell, gc, sizeof s->saved_cell);
566:
567: grid_view_clear(s->grid, 0, 0, sx, sy, 8);
568:
1.60 nicm 569: s->saved_flags = s->grid->flags;
1.59 nicm 570: s->grid->flags &= ~GRID_HISTORY;
571: }
572:
573: /* Exit alternate screen mode and restore the copied grid. */
574: void
575: screen_alternate_off(struct screen *s, struct grid_cell *gc, int cursor)
576: {
577: u_int sx, sy;
578:
579: /*
580: * Restore the cursor position and cell. This happens even if not
581: * currently in the alternate screen.
582: */
583: if (cursor && s->saved_cx != UINT_MAX && s->saved_cy != UINT_MAX) {
584: s->cx = s->saved_cx;
585: if (s->cx > screen_size_x(s) - 1)
586: s->cx = screen_size_x(s) - 1;
587: s->cy = s->saved_cy;
588: if (s->cy > screen_size_y(s) - 1)
589: s->cy = screen_size_y(s) - 1;
590: if (gc != NULL)
591: memcpy(gc, &s->saved_cell, sizeof *gc);
592: }
593:
594: if (s->saved_grid == NULL)
595: return;
596: sx = screen_size_x(s);
597: sy = screen_size_y(s);
598:
599: /*
600: * If the current size is bigger, temporarily resize to the old size
601: * before copying back.
602: */
603: if (sy > s->saved_grid->sy)
604: screen_resize(s, sx, s->saved_grid->sy, 1);
605:
606: /* Restore the saved grid. */
607: grid_duplicate_lines(s->grid, screen_hsize(s), s->saved_grid, 0, sy);
608:
609: /*
610: * Turn history back on (so resize can use it) and then resize back to
611: * the current size.
612: */
1.60 nicm 613: if (s->saved_flags & GRID_HISTORY)
614: s->grid->flags |= GRID_HISTORY;
1.59 nicm 615: if (sy > s->saved_grid->sy || sx != s->saved_grid->sx)
616: screen_resize(s, sx, sy, 1);
617:
618: grid_destroy(s->saved_grid);
619: s->saved_grid = NULL;
1.1 nicm 620: }
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