Annotation of src/usr.bin/tmux/screen.c, Revision 1.52
1.52 ! nicm 1: /* $OpenBSD: screen.c,v 1.51 2018/07/04 09:44:07 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:
1.41 nicm 51: static void screen_resize_x(struct screen *, u_int);
52: static void screen_resize_y(struct screen *, u_int);
1.1 nicm 53:
1.42 nicm 54: static void screen_reflow(struct screen *, u_int);
55:
1.48 nicm 56: /* Free titles stack. */
57: static void
58: screen_free_titles(struct screen *s)
59: {
60: struct screen_title_entry *title_entry;
61:
62: if (s->titles == NULL)
63: return;
64:
65: while ((title_entry = TAILQ_FIRST(s->titles)) != NULL) {
66: TAILQ_REMOVE(s->titles, title_entry, entry);
67: free(title_entry->text);
68: free(title_entry);
69: }
70:
71: free(s->titles);
72: s->titles = NULL;
73: }
74:
1.1 nicm 75: /* Create a new screen. */
76: void
77: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
78: {
79: s->grid = grid_create(sx, sy, hlimit);
1.34 nicm 80: s->title = xstrdup("");
1.48 nicm 81: s->titles = NULL;
1.1 nicm 82:
1.21 nicm 83: s->cstyle = 0;
1.20 nicm 84: s->ccolour = xstrdup("");
1.3 nicm 85: s->tabs = NULL;
1.52 ! nicm 86: s->sel = NULL;
1.3 nicm 87:
1.1 nicm 88: screen_reinit(s);
89: }
90:
91: /* Reinitialise screen. */
92: void
93: screen_reinit(struct screen *s)
94: {
95: s->cx = 0;
96: s->cy = 0;
97:
98: s->rupper = 0;
99: s->rlower = screen_size_y(s) - 1;
100:
1.16 nicm 101: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 102:
1.3 nicm 103: screen_reset_tabs(s);
1.1 nicm 104:
1.44 nicm 105: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
1.1 nicm 106:
107: screen_clear_selection(s);
1.48 nicm 108: screen_free_titles(s);
1.1 nicm 109: }
110:
111: /* Destroy a screen. */
112: void
113: screen_free(struct screen *s)
114: {
1.52 ! nicm 115: free(s->sel);
1.23 nicm 116: free(s->tabs);
117: free(s->title);
118: free(s->ccolour);
1.48 nicm 119:
1.1 nicm 120: grid_destroy(s->grid);
1.48 nicm 121:
122: screen_free_titles(s);
1.1 nicm 123: }
124:
1.3 nicm 125: /* Reset tabs to default, eight spaces apart. */
126: void
127: screen_reset_tabs(struct screen *s)
128: {
129: u_int i;
130:
1.23 nicm 131: free(s->tabs);
1.3 nicm 132:
133: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
134: fatal("bit_alloc failed");
135: for (i = 8; i < screen_size_x(s); i += 8)
136: bit_set(s->tabs, i);
1.21 nicm 137: }
138:
139: /* Set screen cursor style. */
140: void
141: screen_set_cursor_style(struct screen *s, u_int style)
142: {
1.22 nicm 143: if (style <= 6)
1.21 nicm 144: s->cstyle = style;
1.20 nicm 145: }
146:
147: /* Set screen cursor colour. */
148: void
1.36 nicm 149: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 150: {
1.23 nicm 151: free(s->ccolour);
1.36 nicm 152: s->ccolour = xstrdup(colour);
1.3 nicm 153: }
154:
1.1 nicm 155: /* Set screen title. */
156: void
157: screen_set_title(struct screen *s, const char *title)
158: {
1.23 nicm 159: free(s->title);
1.47 nicm 160: utf8_stravis(&s->title, title, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
1.48 nicm 161: }
162:
163: /* Push the current title onto the stack. */
164: void
165: screen_push_title(struct screen *s)
166: {
167: struct screen_title_entry *title_entry;
168:
169: if (s->titles == NULL) {
170: s->titles = xmalloc(sizeof *s->titles);
171: TAILQ_INIT(s->titles);
172: }
173: title_entry = xmalloc(sizeof *title_entry);
174: title_entry->text = xstrdup(s->title);
175: TAILQ_INSERT_HEAD(s->titles, title_entry, entry);
176: }
177:
178: /*
179: * Pop a title from the stack and set it as the screen title. If the stack is
180: * empty, do nothing.
181: */
182: void
183: screen_pop_title(struct screen *s)
184: {
185: struct screen_title_entry *title_entry;
186:
187: if (s->titles == NULL)
188: return;
189:
190: title_entry = TAILQ_FIRST(s->titles);
191: if (title_entry != NULL) {
192: screen_set_title(s, title_entry->text);
193:
194: TAILQ_REMOVE(s->titles, title_entry, entry);
195: free(title_entry->text);
196: free(title_entry);
197: }
1.1 nicm 198: }
199:
200: /* Resize screen. */
201: void
1.24 nicm 202: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 203: {
204: if (sx < 1)
205: sx = 1;
206: if (sy < 1)
207: sy = 1;
208:
1.3 nicm 209: if (sx != screen_size_x(s)) {
1.1 nicm 210: screen_resize_x(s, sx);
1.3 nicm 211:
212: /*
213: * It is unclear what should happen to tabs on resize. xterm
214: * seems to try and maintain them, rxvt resets them. Resetting
215: * is simpler and more reliable so let's do that.
216: */
217: screen_reset_tabs(s);
1.49 nicm 218: } else
219: reflow = 0;
1.3 nicm 220:
1.1 nicm 221: if (sy != screen_size_y(s))
222: screen_resize_y(s, sy);
1.24 nicm 223:
224: if (reflow)
225: screen_reflow(s, sx);
1.1 nicm 226: }
227:
1.41 nicm 228: static void
1.1 nicm 229: screen_resize_x(struct screen *s, u_int sx)
230: {
231: struct grid *gd = s->grid;
232:
233: if (sx == 0)
234: fatalx("zero size");
235:
1.7 nicm 236: /*
237: * Treat resizing horizontally simply: just ensure the cursor is
238: * on-screen and change the size. Don't bother to truncate any lines -
1.38 nicm 239: * then the data should be accessible if the size is then increased.
1.7 nicm 240: *
241: * The only potential wrinkle is if UTF-8 double-width characters are
242: * left in the last column, but UTF-8 terminals should deal with this
243: * sanely.
244: */
1.1 nicm 245: if (s->cx >= sx)
246: s->cx = sx - 1;
247: gd->sx = sx;
248: }
249:
1.41 nicm 250: static void
1.1 nicm 251: screen_resize_y(struct screen *s, u_int sy)
252: {
253: struct grid *gd = s->grid;
1.4 nicm 254: u_int needed, available, oldy, i;
1.1 nicm 255:
256: if (sy == 0)
257: fatalx("zero size");
1.4 nicm 258: oldy = screen_size_y(s);
259:
1.12 nicm 260: /*
1.4 nicm 261: * When resizing:
262: *
263: * If the height is decreasing, delete lines from the bottom until
264: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 265: *
1.40 nicm 266: * When increasing, pull as many lines as possible from scrolled
267: * history (not explicitly cleared from view) to the top, then fill the
268: * remaining with blanks at the bottom.
1.4 nicm 269: */
1.1 nicm 270:
271: /* Size decreasing. */
1.4 nicm 272: if (sy < oldy) {
273: needed = oldy - sy;
1.1 nicm 274:
1.4 nicm 275: /* Delete as many lines as possible from the bottom. */
276: available = oldy - 1 - s->cy;
277: if (available > 0) {
278: if (available > needed)
279: available = needed;
1.44 nicm 280: grid_view_delete_lines(gd, oldy - available, available,
281: 8);
1.1 nicm 282: }
1.4 nicm 283: needed -= available;
1.1 nicm 284:
1.4 nicm 285: /*
1.8 nicm 286: * Now just increase the history size, if possible, to take
287: * over the lines which are left. If history is off, delete
288: * lines from the top.
1.4 nicm 289: */
1.8 nicm 290: available = s->cy;
1.40 nicm 291: if (gd->flags & GRID_HISTORY) {
292: gd->hscrolled += needed;
1.8 nicm 293: gd->hsize += needed;
1.40 nicm 294: } else if (needed > 0 && available > 0) {
1.8 nicm 295: if (available > needed)
296: available = needed;
1.44 nicm 297: grid_view_delete_lines(gd, 0, available, 8);
1.8 nicm 298: }
1.4 nicm 299: s->cy -= needed;
1.12 nicm 300: }
1.1 nicm 301:
1.51 nicm 302: /* Resize line array. */
303: grid_adjust_lines(gd, gd->hsize + sy);
1.1 nicm 304:
305: /* Size increasing. */
1.4 nicm 306: if (sy > oldy) {
307: needed = sy - oldy;
308:
1.8 nicm 309: /*
1.41 nicm 310: * Try to pull as much as possible out of scrolled history, if
311: * is is enabled.
1.8 nicm 312: */
1.40 nicm 313: available = gd->hscrolled;
1.8 nicm 314: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 315: if (available > needed)
316: available = needed;
1.40 nicm 317: gd->hscrolled -= available;
1.4 nicm 318: gd->hsize -= available;
319: s->cy += available;
1.8 nicm 320: } else
321: available = 0;
1.4 nicm 322: needed -= available;
323:
324: /* Then fill the rest in with blanks. */
1.11 nicm 325: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
1.51 nicm 326: memset(grid_get_line(gd, i), 0, sizeof(struct grid_line));
1.1 nicm 327: }
328:
1.4 nicm 329: /* Set the new size, and reset the scroll region. */
1.1 nicm 330: gd->sy = sy;
331: s->rupper = 0;
332: s->rlower = screen_size_y(s) - 1;
333: }
334:
335: /* Set selection. */
336: void
1.14 nicm 337: screen_set_selection(struct screen *s, u_int sx, u_int sy,
1.52 ! nicm 338: u_int ex, u_int ey, u_int rectangle, int modekeys, struct grid_cell *gc)
1.1 nicm 339: {
1.52 ! nicm 340: if (s->sel == NULL)
! 341: s->sel = xcalloc(1, sizeof *s->sel);
1.1 nicm 342:
1.52 ! nicm 343: memcpy(&s->sel->cell, gc, sizeof s->sel->cell);
! 344: s->sel->hidden = 0;
! 345: s->sel->rectangle = rectangle;
! 346: s->sel->modekeys = modekeys;
! 347:
! 348: s->sel->sx = sx;
! 349: s->sel->sy = sy;
! 350: s->sel->ex = ex;
! 351: s->sel->ey = ey;
1.1 nicm 352: }
353:
354: /* Clear selection. */
355: void
356: screen_clear_selection(struct screen *s)
357: {
1.52 ! nicm 358: free(s->sel);
! 359: s->sel = NULL;
1.1 nicm 360: }
361:
1.45 nicm 362: /* Hide selection. */
363: void
364: screen_hide_selection(struct screen *s)
365: {
1.52 ! nicm 366: if (s->sel != NULL)
! 367: s->sel->hidden = 1;
1.45 nicm 368: }
369:
1.1 nicm 370: /* Check if cell in selection. */
371: int
372: screen_check_selection(struct screen *s, u_int px, u_int py)
373: {
1.52 ! nicm 374: struct screen_sel *sel = s->sel;
1.28 nicm 375: u_int xx;
1.1 nicm 376:
1.52 ! nicm 377: if (sel == NULL || sel->hidden)
1.1 nicm 378: return (0);
379:
1.52 ! nicm 380: if (sel->rectangle) {
1.14 nicm 381: if (sel->sy < sel->ey) {
382: /* start line < end line -- downward selection. */
383: if (py < sel->sy || py > sel->ey)
384: return (0);
385: } else if (sel->sy > sel->ey) {
386: /* start line > end line -- upward selection. */
387: if (py > sel->sy || py < sel->ey)
388: return (0);
389: } else {
390: /* starting line == ending line. */
391: if (py != sel->sy)
392: return (0);
393: }
394:
395: /*
396: * Need to include the selection start row, but not the cursor
397: * row, which means the selection changes depending on which
398: * one is on the left.
399: */
400: if (sel->ex < sel->sx) {
401: /* Cursor (ex) is on the left. */
1.17 nicm 402: if (px < sel->ex)
1.14 nicm 403: return (0);
404:
405: if (px > sel->sx)
406: return (0);
407: } else {
408: /* Selection start (sx) is on the left. */
409: if (px < sel->sx)
410: return (0);
411:
1.17 nicm 412: if (px > sel->ex)
1.14 nicm 413: return (0);
414: }
415: } else {
416: /*
417: * Like emacs, keep the top-left-most character, and drop the
418: * bottom-right-most, regardless of copy direction.
419: */
420: if (sel->sy < sel->ey) {
421: /* starting line < ending line -- downward selection. */
422: if (py < sel->sy || py > sel->ey)
423: return (0);
424:
1.28 nicm 425: if (py == sel->sy && px < sel->sx)
1.29 nicm 426: return (0);
1.28 nicm 427:
428: if (py == sel->ey && px > sel->ex)
1.14 nicm 429: return (0);
430: } else if (sel->sy > sel->ey) {
431: /* starting line > ending line -- upward selection. */
432: if (py > sel->sy || py < sel->ey)
433: return (0);
434:
1.28 nicm 435: if (py == sel->ey && px < sel->ex)
436: return (0);
437:
438: if (sel->modekeys == MODEKEY_EMACS)
439: xx = sel->sx - 1;
440: else
441: xx = sel->sx;
1.46 nicm 442: if (py == sel->sy && (sel->sx == 0 || px > xx))
1.14 nicm 443: return (0);
444: } else {
445: /* starting line == ending line. */
446: if (py != sel->sy)
447: return (0);
448:
449: if (sel->ex < sel->sx) {
450: /* cursor (ex) is on the left */
1.28 nicm 451: if (sel->modekeys == MODEKEY_EMACS)
452: xx = sel->sx - 1;
453: else
454: xx = sel->sx;
455: if (px > xx || px < sel->ex)
1.14 nicm 456: return (0);
457: } else {
458: /* selection start (sx) is on the left */
459: if (px < sel->sx || px > sel->ex)
460: return (0);
461: }
462: }
1.1 nicm 463: }
464:
465: return (1);
1.43 nicm 466: }
467:
468: /* Get selected grid cell. */
469: void
470: screen_select_cell(struct screen *s, struct grid_cell *dst,
471: const struct grid_cell *src)
472: {
1.52 ! nicm 473: if (s->sel == NULL || s->sel->hidden)
1.43 nicm 474: return;
475:
1.52 ! nicm 476: memcpy(dst, &s->sel->cell, sizeof *dst);
1.43 nicm 477:
478: utf8_copy(&dst->data, &src->data);
479: dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
480: dst->attr |= src->attr & GRID_ATTR_CHARSET;
481: dst->flags = src->flags;
1.24 nicm 482: }
483:
484: /* Reflow wrapped lines. */
1.42 nicm 485: static void
1.25 nicm 486: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 487: {
1.50 nicm 488: grid_reflow(s->grid, new_x, &s->cy);
1.1 nicm 489: }
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