Annotation of src/usr.bin/tmux/screen.c, Revision 1.45
1.45 ! nicm 1: /* $OpenBSD: screen.c,v 1.44 2016/10/13 20:27:27 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>
1.1 nicm 24:
25: #include "tmux.h"
26:
1.41 nicm 27: static void screen_resize_x(struct screen *, u_int);
28: static void screen_resize_y(struct screen *, u_int);
1.1 nicm 29:
1.42 nicm 30: static void screen_reflow(struct screen *, u_int);
31:
1.1 nicm 32: /* Create a new screen. */
33: void
34: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
35: {
36: s->grid = grid_create(sx, sy, hlimit);
1.34 nicm 37: s->title = xstrdup("");
1.1 nicm 38:
1.21 nicm 39: s->cstyle = 0;
1.20 nicm 40: s->ccolour = xstrdup("");
1.3 nicm 41: s->tabs = NULL;
42:
1.39 nicm 43: s->dirty = NULL;
44: s->dirtysize = 0;
45:
1.1 nicm 46: screen_reinit(s);
47: }
48:
49: /* Reinitialise screen. */
50: void
51: screen_reinit(struct screen *s)
52: {
53: s->cx = 0;
54: s->cy = 0;
55:
56: s->rupper = 0;
57: s->rlower = screen_size_y(s) - 1;
58:
1.16 nicm 59: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 60:
1.3 nicm 61: screen_reset_tabs(s);
1.1 nicm 62:
1.44 nicm 63: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
1.1 nicm 64:
65: screen_clear_selection(s);
66: }
67:
68: /* Destroy a screen. */
69: void
70: screen_free(struct screen *s)
71: {
1.39 nicm 72: free(s->dirty);
1.23 nicm 73: free(s->tabs);
74: free(s->title);
75: free(s->ccolour);
1.1 nicm 76: grid_destroy(s->grid);
77: }
78:
1.3 nicm 79: /* Reset tabs to default, eight spaces apart. */
80: void
81: screen_reset_tabs(struct screen *s)
82: {
83: u_int i;
84:
1.23 nicm 85: free(s->tabs);
1.3 nicm 86:
87: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
88: fatal("bit_alloc failed");
89: for (i = 8; i < screen_size_x(s); i += 8)
90: bit_set(s->tabs, i);
1.21 nicm 91: }
92:
93: /* Set screen cursor style. */
94: void
95: screen_set_cursor_style(struct screen *s, u_int style)
96: {
1.22 nicm 97: if (style <= 6)
1.21 nicm 98: s->cstyle = style;
1.20 nicm 99: }
100:
101: /* Set screen cursor colour. */
102: void
1.36 nicm 103: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 104: {
1.23 nicm 105: free(s->ccolour);
1.36 nicm 106: s->ccolour = xstrdup(colour);
1.3 nicm 107: }
108:
1.1 nicm 109: /* Set screen title. */
110: void
111: screen_set_title(struct screen *s, const char *title)
112: {
1.23 nicm 113: free(s->title);
1.27 nicm 114: s->title = xstrdup(title);
1.1 nicm 115: }
116:
117: /* Resize screen. */
118: void
1.24 nicm 119: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 120: {
121: if (sx < 1)
122: sx = 1;
123: if (sy < 1)
124: sy = 1;
125:
1.3 nicm 126: if (sx != screen_size_x(s)) {
1.1 nicm 127: screen_resize_x(s, sx);
1.3 nicm 128:
129: /*
130: * It is unclear what should happen to tabs on resize. xterm
131: * seems to try and maintain them, rxvt resets them. Resetting
132: * is simpler and more reliable so let's do that.
133: */
134: screen_reset_tabs(s);
135: }
136:
1.1 nicm 137: if (sy != screen_size_y(s))
138: screen_resize_y(s, sy);
1.24 nicm 139:
140: if (reflow)
141: screen_reflow(s, sx);
1.1 nicm 142: }
143:
1.41 nicm 144: static void
1.1 nicm 145: screen_resize_x(struct screen *s, u_int sx)
146: {
147: struct grid *gd = s->grid;
148:
149: if (sx == 0)
150: fatalx("zero size");
151:
1.7 nicm 152: /*
153: * Treat resizing horizontally simply: just ensure the cursor is
154: * on-screen and change the size. Don't bother to truncate any lines -
1.38 nicm 155: * then the data should be accessible if the size is then increased.
1.7 nicm 156: *
157: * The only potential wrinkle is if UTF-8 double-width characters are
158: * left in the last column, but UTF-8 terminals should deal with this
159: * sanely.
160: */
1.1 nicm 161: if (s->cx >= sx)
162: s->cx = sx - 1;
163: gd->sx = sx;
164: }
165:
1.41 nicm 166: static void
1.1 nicm 167: screen_resize_y(struct screen *s, u_int sy)
168: {
169: struct grid *gd = s->grid;
1.4 nicm 170: u_int needed, available, oldy, i;
1.1 nicm 171:
172: if (sy == 0)
173: fatalx("zero size");
1.4 nicm 174: oldy = screen_size_y(s);
175:
1.12 nicm 176: /*
1.4 nicm 177: * When resizing:
178: *
179: * If the height is decreasing, delete lines from the bottom until
180: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 181: *
1.40 nicm 182: * When increasing, pull as many lines as possible from scrolled
183: * history (not explicitly cleared from view) to the top, then fill the
184: * remaining with blanks at the bottom.
1.4 nicm 185: */
1.1 nicm 186:
187: /* Size decreasing. */
1.4 nicm 188: if (sy < oldy) {
189: needed = oldy - sy;
1.1 nicm 190:
1.4 nicm 191: /* Delete as many lines as possible from the bottom. */
192: available = oldy - 1 - s->cy;
193: if (available > 0) {
194: if (available > needed)
195: available = needed;
1.44 nicm 196: grid_view_delete_lines(gd, oldy - available, available,
197: 8);
1.1 nicm 198: }
1.4 nicm 199: needed -= available;
1.1 nicm 200:
1.4 nicm 201: /*
1.8 nicm 202: * Now just increase the history size, if possible, to take
203: * over the lines which are left. If history is off, delete
204: * lines from the top.
1.4 nicm 205: */
1.8 nicm 206: available = s->cy;
1.40 nicm 207: if (gd->flags & GRID_HISTORY) {
208: gd->hscrolled += needed;
1.8 nicm 209: gd->hsize += needed;
1.40 nicm 210: } else if (needed > 0 && available > 0) {
1.8 nicm 211: if (available > needed)
212: available = needed;
1.44 nicm 213: grid_view_delete_lines(gd, 0, available, 8);
1.8 nicm 214: }
1.4 nicm 215: s->cy -= needed;
1.12 nicm 216: }
1.1 nicm 217:
218: /* Resize line arrays. */
1.30 nicm 219: gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
220: sizeof *gd->linedata);
1.1 nicm 221:
222: /* Size increasing. */
1.4 nicm 223: if (sy > oldy) {
224: needed = sy - oldy;
225:
1.8 nicm 226: /*
1.41 nicm 227: * Try to pull as much as possible out of scrolled history, if
228: * is is enabled.
1.8 nicm 229: */
1.40 nicm 230: available = gd->hscrolled;
1.8 nicm 231: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 232: if (available > needed)
233: available = needed;
1.40 nicm 234: gd->hscrolled -= available;
1.4 nicm 235: gd->hsize -= available;
236: s->cy += available;
1.8 nicm 237: } else
238: available = 0;
1.4 nicm 239: needed -= available;
240:
241: /* Then fill the rest in with blanks. */
1.11 nicm 242: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
243: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 244: }
245:
1.4 nicm 246: /* Set the new size, and reset the scroll region. */
1.1 nicm 247: gd->sy = sy;
248: s->rupper = 0;
249: s->rlower = screen_size_y(s) - 1;
250: }
251:
252: /* Set selection. */
253: void
1.14 nicm 254: screen_set_selection(struct screen *s, u_int sx, u_int sy,
255: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 256: {
257: struct screen_sel *sel = &s->sel;
258:
259: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 260: sel->flag = 1;
1.45 ! nicm 261: sel->hidden = 0;
! 262:
1.14 nicm 263: sel->rectflag = rectflag;
1.13 nicm 264:
1.14 nicm 265: sel->sx = sx; sel->sy = sy;
266: sel->ex = ex; sel->ey = ey;
1.1 nicm 267: }
268:
269: /* Clear selection. */
270: void
271: screen_clear_selection(struct screen *s)
272: {
273: struct screen_sel *sel = &s->sel;
274:
275: sel->flag = 0;
1.45 ! nicm 276: sel->hidden = 0;
1.32 nicm 277: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 278: }
279:
1.45 ! nicm 280: /* Hide selection. */
! 281: void
! 282: screen_hide_selection(struct screen *s)
! 283: {
! 284: struct screen_sel *sel = &s->sel;
! 285:
! 286: sel->hidden = 1;
! 287: }
! 288:
1.1 nicm 289: /* Check if cell in selection. */
290: int
291: screen_check_selection(struct screen *s, u_int px, u_int py)
292: {
293: struct screen_sel *sel = &s->sel;
1.28 nicm 294: u_int xx;
1.1 nicm 295:
1.45 ! nicm 296: if (!sel->flag || sel->hidden)
1.1 nicm 297: return (0);
298:
1.14 nicm 299: if (sel->rectflag) {
300: if (sel->sy < sel->ey) {
301: /* start line < end line -- downward selection. */
302: if (py < sel->sy || py > sel->ey)
303: return (0);
304: } else if (sel->sy > sel->ey) {
305: /* start line > end line -- upward selection. */
306: if (py > sel->sy || py < sel->ey)
307: return (0);
308: } else {
309: /* starting line == ending line. */
310: if (py != sel->sy)
311: return (0);
312: }
313:
314: /*
315: * Need to include the selection start row, but not the cursor
316: * row, which means the selection changes depending on which
317: * one is on the left.
318: */
319: if (sel->ex < sel->sx) {
320: /* Cursor (ex) is on the left. */
1.17 nicm 321: if (px < sel->ex)
1.14 nicm 322: return (0);
323:
324: if (px > sel->sx)
325: return (0);
326: } else {
327: /* Selection start (sx) is on the left. */
328: if (px < sel->sx)
329: return (0);
330:
1.17 nicm 331: if (px > sel->ex)
1.14 nicm 332: return (0);
333: }
334: } else {
335: /*
336: * Like emacs, keep the top-left-most character, and drop the
337: * bottom-right-most, regardless of copy direction.
338: */
339: if (sel->sy < sel->ey) {
340: /* starting line < ending line -- downward selection. */
341: if (py < sel->sy || py > sel->ey)
342: return (0);
343:
1.28 nicm 344: if (py == sel->sy && px < sel->sx)
1.29 nicm 345: return (0);
1.28 nicm 346:
347: if (py == sel->ey && px > sel->ex)
1.14 nicm 348: return (0);
349: } else if (sel->sy > sel->ey) {
350: /* starting line > ending line -- upward selection. */
351: if (py > sel->sy || py < sel->ey)
352: return (0);
353:
1.28 nicm 354: if (py == sel->ey && px < sel->ex)
355: return (0);
356:
357: if (sel->modekeys == MODEKEY_EMACS)
358: xx = sel->sx - 1;
359: else
360: xx = sel->sx;
361: if (py == sel->sy && px > xx)
1.14 nicm 362: return (0);
363: } else {
364: /* starting line == ending line. */
365: if (py != sel->sy)
366: return (0);
367:
368: if (sel->ex < sel->sx) {
369: /* cursor (ex) is on the left */
1.28 nicm 370: if (sel->modekeys == MODEKEY_EMACS)
371: xx = sel->sx - 1;
372: else
373: xx = sel->sx;
374: if (px > xx || px < sel->ex)
1.14 nicm 375: return (0);
376: } else {
377: /* selection start (sx) is on the left */
378: if (px < sel->sx || px > sel->ex)
379: return (0);
380: }
381: }
1.1 nicm 382: }
383:
384: return (1);
1.43 nicm 385: }
386:
387: /* Get selected grid cell. */
388: void
389: screen_select_cell(struct screen *s, struct grid_cell *dst,
390: const struct grid_cell *src)
391: {
1.45 ! nicm 392: if (!s->sel.flag || s->sel.hidden)
1.43 nicm 393: return;
394:
395: memcpy(dst, &s->sel.cell, sizeof *dst);
396:
397: utf8_copy(&dst->data, &src->data);
398: dst->attr = dst->attr & ~GRID_ATTR_CHARSET;
399: dst->attr |= src->attr & GRID_ATTR_CHARSET;
400: dst->flags = src->flags;
1.24 nicm 401: }
402:
403: /* Reflow wrapped lines. */
1.42 nicm 404: static void
1.25 nicm 405: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 406: {
1.25 nicm 407: struct grid *old = s->grid;
1.26 nicm 408: u_int change;
1.24 nicm 409:
1.25 nicm 410: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 411:
412: change = grid_reflow(s->grid, old, new_x);
413: if (change < s->cy)
414: s->cy -= change;
415: else
416: s->cy = 0;
1.1 nicm 417: }
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