Annotation of src/usr.bin/tmux/screen.c, Revision 1.48
1.48 ! nicm 1: /* $OpenBSD: screen.c,v 1.47 2017/06/04 09:02:36 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:
1.48 ! nicm 28: struct screen_title_entry {
! 29: char *text;
! 30:
! 31: TAILQ_ENTRY(screen_title_entry) entry;
! 32: };
! 33: TAILQ_HEAD(screen_titles, screen_title_entry);
! 34:
1.41 nicm 35: static void screen_resize_x(struct screen *, u_int);
36: static void screen_resize_y(struct screen *, u_int);
1.1 nicm 37:
1.42 nicm 38: static void screen_reflow(struct screen *, u_int);
39:
1.48 ! nicm 40: /* Free titles stack. */
! 41: static void
! 42: screen_free_titles(struct screen *s)
! 43: {
! 44: struct screen_title_entry *title_entry;
! 45:
! 46: if (s->titles == NULL)
! 47: return;
! 48:
! 49: while ((title_entry = TAILQ_FIRST(s->titles)) != NULL) {
! 50: TAILQ_REMOVE(s->titles, title_entry, entry);
! 51: free(title_entry->text);
! 52: free(title_entry);
! 53: }
! 54:
! 55: free(s->titles);
! 56: s->titles = NULL;
! 57: }
! 58:
1.1 nicm 59: /* Create a new screen. */
60: void
61: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
62: {
63: s->grid = grid_create(sx, sy, hlimit);
1.34 nicm 64: s->title = xstrdup("");
1.48 ! nicm 65: s->titles = NULL;
1.1 nicm 66:
1.21 nicm 67: s->cstyle = 0;
1.20 nicm 68: s->ccolour = xstrdup("");
1.3 nicm 69: s->tabs = NULL;
70:
1.1 nicm 71: screen_reinit(s);
72: }
73:
74: /* Reinitialise screen. */
75: void
76: screen_reinit(struct screen *s)
77: {
78: s->cx = 0;
79: s->cy = 0;
80:
81: s->rupper = 0;
82: s->rlower = screen_size_y(s) - 1;
83:
1.16 nicm 84: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 85:
1.3 nicm 86: screen_reset_tabs(s);
1.1 nicm 87:
1.44 nicm 88: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
1.1 nicm 89:
90: screen_clear_selection(s);
1.48 ! nicm 91: screen_free_titles(s);
1.1 nicm 92: }
93:
94: /* Destroy a screen. */
95: void
96: screen_free(struct screen *s)
97: {
1.23 nicm 98: free(s->tabs);
99: free(s->title);
100: free(s->ccolour);
1.48 ! nicm 101:
1.1 nicm 102: grid_destroy(s->grid);
1.48 ! nicm 103:
! 104: screen_free_titles(s);
1.1 nicm 105: }
106:
1.3 nicm 107: /* Reset tabs to default, eight spaces apart. */
108: void
109: screen_reset_tabs(struct screen *s)
110: {
111: u_int i;
112:
1.23 nicm 113: free(s->tabs);
1.3 nicm 114:
115: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
116: fatal("bit_alloc failed");
117: for (i = 8; i < screen_size_x(s); i += 8)
118: bit_set(s->tabs, i);
1.21 nicm 119: }
120:
121: /* Set screen cursor style. */
122: void
123: screen_set_cursor_style(struct screen *s, u_int style)
124: {
1.22 nicm 125: if (style <= 6)
1.21 nicm 126: s->cstyle = style;
1.20 nicm 127: }
128:
129: /* Set screen cursor colour. */
130: void
1.36 nicm 131: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 132: {
1.23 nicm 133: free(s->ccolour);
1.36 nicm 134: s->ccolour = xstrdup(colour);
1.3 nicm 135: }
136:
1.1 nicm 137: /* Set screen title. */
138: void
139: screen_set_title(struct screen *s, const char *title)
140: {
1.23 nicm 141: free(s->title);
1.47 nicm 142: utf8_stravis(&s->title, title, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
1.48 ! nicm 143: }
! 144:
! 145: /* Push the current title onto the stack. */
! 146: void
! 147: screen_push_title(struct screen *s)
! 148: {
! 149: struct screen_title_entry *title_entry;
! 150:
! 151: if (s->titles == NULL) {
! 152: s->titles = xmalloc(sizeof *s->titles);
! 153: TAILQ_INIT(s->titles);
! 154: }
! 155: title_entry = xmalloc(sizeof *title_entry);
! 156: title_entry->text = xstrdup(s->title);
! 157: TAILQ_INSERT_HEAD(s->titles, title_entry, entry);
! 158: }
! 159:
! 160: /*
! 161: * Pop a title from the stack and set it as the screen title. If the stack is
! 162: * empty, do nothing.
! 163: */
! 164: void
! 165: screen_pop_title(struct screen *s)
! 166: {
! 167: struct screen_title_entry *title_entry;
! 168:
! 169: if (s->titles == NULL)
! 170: return;
! 171:
! 172: title_entry = TAILQ_FIRST(s->titles);
! 173: if (title_entry != NULL) {
! 174: screen_set_title(s, title_entry->text);
! 175:
! 176: TAILQ_REMOVE(s->titles, title_entry, entry);
! 177: free(title_entry->text);
! 178: free(title_entry);
! 179: }
1.1 nicm 180: }
181:
182: /* Resize screen. */
183: void
1.24 nicm 184: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 185: {
186: if (sx < 1)
187: sx = 1;
188: if (sy < 1)
189: sy = 1;
190:
1.3 nicm 191: if (sx != screen_size_x(s)) {
1.1 nicm 192: screen_resize_x(s, sx);
1.3 nicm 193:
194: /*
195: * It is unclear what should happen to tabs on resize. xterm
196: * seems to try and maintain them, rxvt resets them. Resetting
197: * is simpler and more reliable so let's do that.
198: */
199: screen_reset_tabs(s);
200: }
201:
1.1 nicm 202: if (sy != screen_size_y(s))
203: screen_resize_y(s, sy);
1.24 nicm 204:
205: if (reflow)
206: screen_reflow(s, sx);
1.1 nicm 207: }
208:
1.41 nicm 209: static void
1.1 nicm 210: screen_resize_x(struct screen *s, u_int sx)
211: {
212: struct grid *gd = s->grid;
213:
214: if (sx == 0)
215: fatalx("zero size");
216:
1.7 nicm 217: /*
218: * Treat resizing horizontally simply: just ensure the cursor is
219: * on-screen and change the size. Don't bother to truncate any lines -
1.38 nicm 220: * then the data should be accessible if the size is then increased.
1.7 nicm 221: *
222: * The only potential wrinkle is if UTF-8 double-width characters are
223: * left in the last column, but UTF-8 terminals should deal with this
224: * sanely.
225: */
1.1 nicm 226: if (s->cx >= sx)
227: s->cx = sx - 1;
228: gd->sx = sx;
229: }
230:
1.41 nicm 231: static void
1.1 nicm 232: screen_resize_y(struct screen *s, u_int sy)
233: {
234: struct grid *gd = s->grid;
1.4 nicm 235: u_int needed, available, oldy, i;
1.1 nicm 236:
237: if (sy == 0)
238: fatalx("zero size");
1.4 nicm 239: oldy = screen_size_y(s);
240:
1.12 nicm 241: /*
1.4 nicm 242: * When resizing:
243: *
244: * If the height is decreasing, delete lines from the bottom until
245: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 246: *
1.40 nicm 247: * When increasing, pull as many lines as possible from scrolled
248: * history (not explicitly cleared from view) to the top, then fill the
249: * remaining with blanks at the bottom.
1.4 nicm 250: */
1.1 nicm 251:
252: /* Size decreasing. */
1.4 nicm 253: if (sy < oldy) {
254: needed = oldy - sy;
1.1 nicm 255:
1.4 nicm 256: /* Delete as many lines as possible from the bottom. */
257: available = oldy - 1 - s->cy;
258: if (available > 0) {
259: if (available > needed)
260: available = needed;
1.44 nicm 261: grid_view_delete_lines(gd, oldy - available, available,
262: 8);
1.1 nicm 263: }
1.4 nicm 264: needed -= available;
1.1 nicm 265:
1.4 nicm 266: /*
1.8 nicm 267: * Now just increase the history size, if possible, to take
268: * over the lines which are left. If history is off, delete
269: * lines from the top.
1.4 nicm 270: */
1.8 nicm 271: available = s->cy;
1.40 nicm 272: if (gd->flags & GRID_HISTORY) {
273: gd->hscrolled += needed;
1.8 nicm 274: gd->hsize += needed;
1.40 nicm 275: } else if (needed > 0 && available > 0) {
1.8 nicm 276: if (available > needed)
277: available = needed;
1.44 nicm 278: grid_view_delete_lines(gd, 0, available, 8);
1.8 nicm 279: }
1.4 nicm 280: s->cy -= needed;
1.12 nicm 281: }
1.1 nicm 282:
283: /* Resize line arrays. */
1.30 nicm 284: gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
285: sizeof *gd->linedata);
1.1 nicm 286:
287: /* Size increasing. */
1.4 nicm 288: if (sy > oldy) {
289: needed = sy - oldy;
290:
1.8 nicm 291: /*
1.41 nicm 292: * Try to pull as much as possible out of scrolled history, if
293: * is is enabled.
1.8 nicm 294: */
1.40 nicm 295: available = gd->hscrolled;
1.8 nicm 296: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 297: if (available > needed)
298: available = needed;
1.40 nicm 299: gd->hscrolled -= available;
1.4 nicm 300: gd->hsize -= available;
301: s->cy += available;
1.8 nicm 302: } else
303: available = 0;
1.4 nicm 304: needed -= available;
305:
306: /* Then fill the rest in with blanks. */
1.11 nicm 307: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
308: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 309: }
310:
1.4 nicm 311: /* Set the new size, and reset the scroll region. */
1.1 nicm 312: gd->sy = sy;
313: s->rupper = 0;
314: s->rlower = screen_size_y(s) - 1;
315: }
316:
317: /* Set selection. */
318: void
1.14 nicm 319: screen_set_selection(struct screen *s, u_int sx, u_int sy,
320: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 321: {
322: struct screen_sel *sel = &s->sel;
323:
324: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 325: sel->flag = 1;
1.45 nicm 326: sel->hidden = 0;
327:
1.14 nicm 328: sel->rectflag = rectflag;
1.13 nicm 329:
1.14 nicm 330: sel->sx = sx; sel->sy = sy;
331: sel->ex = ex; sel->ey = ey;
1.1 nicm 332: }
333:
334: /* Clear selection. */
335: void
336: screen_clear_selection(struct screen *s)
337: {
338: struct screen_sel *sel = &s->sel;
339:
340: sel->flag = 0;
1.45 nicm 341: sel->hidden = 0;
1.32 nicm 342: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 343: }
344:
1.45 nicm 345: /* Hide selection. */
346: void
347: screen_hide_selection(struct screen *s)
348: {
349: struct screen_sel *sel = &s->sel;
350:
351: sel->hidden = 1;
352: }
353:
1.1 nicm 354: /* Check if cell in selection. */
355: int
356: screen_check_selection(struct screen *s, u_int px, u_int py)
357: {
358: struct screen_sel *sel = &s->sel;
1.28 nicm 359: u_int xx;
1.1 nicm 360:
1.45 nicm 361: if (!sel->flag || sel->hidden)
1.1 nicm 362: return (0);
363:
1.14 nicm 364: if (sel->rectflag) {
365: if (sel->sy < sel->ey) {
366: /* start line < end line -- downward selection. */
367: if (py < sel->sy || py > sel->ey)
368: return (0);
369: } else if (sel->sy > sel->ey) {
370: /* start line > end line -- upward selection. */
371: if (py > sel->sy || py < sel->ey)
372: return (0);
373: } else {
374: /* starting line == ending line. */
375: if (py != sel->sy)
376: return (0);
377: }
378:
379: /*
380: * Need to include the selection start row, but not the cursor
381: * row, which means the selection changes depending on which
382: * one is on the left.
383: */
384: if (sel->ex < sel->sx) {
385: /* Cursor (ex) is on the left. */
1.17 nicm 386: if (px < sel->ex)
1.14 nicm 387: return (0);
388:
389: if (px > sel->sx)
390: return (0);
391: } else {
392: /* Selection start (sx) is on the left. */
393: if (px < sel->sx)
394: return (0);
395:
1.17 nicm 396: if (px > sel->ex)
1.14 nicm 397: return (0);
398: }
399: } else {
400: /*
401: * Like emacs, keep the top-left-most character, and drop the
402: * bottom-right-most, regardless of copy direction.
403: */
404: if (sel->sy < sel->ey) {
405: /* starting line < ending line -- downward selection. */
406: if (py < sel->sy || py > sel->ey)
407: return (0);
408:
1.28 nicm 409: if (py == sel->sy && px < sel->sx)
1.29 nicm 410: return (0);
1.28 nicm 411:
412: if (py == sel->ey && px > sel->ex)
1.14 nicm 413: return (0);
414: } else if (sel->sy > sel->ey) {
415: /* starting line > ending line -- upward selection. */
416: if (py > sel->sy || py < sel->ey)
417: return (0);
418:
1.28 nicm 419: if (py == sel->ey && px < sel->ex)
420: return (0);
421:
422: if (sel->modekeys == MODEKEY_EMACS)
423: xx = sel->sx - 1;
424: else
425: xx = sel->sx;
1.46 nicm 426: if (py == sel->sy && (sel->sx == 0 || px > xx))
1.14 nicm 427: return (0);
428: } else {
429: /* starting line == ending line. */
430: if (py != sel->sy)
431: return (0);
432:
433: if (sel->ex < sel->sx) {
434: /* cursor (ex) is on the left */
1.28 nicm 435: if (sel->modekeys == MODEKEY_EMACS)
436: xx = sel->sx - 1;
437: else
438: xx = sel->sx;
439: if (px > xx || px < sel->ex)
1.14 nicm 440: return (0);
441: } else {
442: /* selection start (sx) is on the left */
443: if (px < sel->sx || px > sel->ex)
444: return (0);
445: }
446: }
1.1 nicm 447: }
448:
449: return (1);
1.43 nicm 450: }
451:
452: /* Get selected grid cell. */
453: void
454: screen_select_cell(struct screen *s, struct grid_cell *dst,
455: const struct grid_cell *src)
456: {
1.45 nicm 457: if (!s->sel.flag || s->sel.hidden)
1.43 nicm 458: return;
459:
460: memcpy(dst, &s->sel.cell, sizeof *dst);
461:
462: utf8_copy(&dst->data, &src->data);
463: dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
464: dst->attr |= src->attr & GRID_ATTR_CHARSET;
465: dst->flags = src->flags;
1.24 nicm 466: }
467:
468: /* Reflow wrapped lines. */
1.42 nicm 469: static void
1.25 nicm 470: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 471: {
1.25 nicm 472: struct grid *old = s->grid;
1.26 nicm 473: u_int change;
1.24 nicm 474:
1.25 nicm 475: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 476:
477: change = grid_reflow(s->grid, old, new_x);
478: if (change < s->cy)
479: s->cy -= change;
480: else
481: s->cy = 0;
1.1 nicm 482: }
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