Annotation of src/usr.bin/tmux/screen.c, Revision 1.40
1.40 ! nicm 1: /* $OpenBSD: screen.c,v 1.39 2016/07/15 00:49:08 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:
27: void screen_resize_x(struct screen *, u_int);
28: void screen_resize_y(struct screen *, u_int);
29:
30: /* Create a new screen. */
31: void
32: screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
33: {
34: s->grid = grid_create(sx, sy, hlimit);
1.34 nicm 35: s->title = xstrdup("");
1.1 nicm 36:
1.21 nicm 37: s->cstyle = 0;
1.20 nicm 38: s->ccolour = xstrdup("");
1.3 nicm 39: s->tabs = NULL;
40:
1.39 nicm 41: s->dirty = NULL;
42: s->dirtysize = 0;
43:
1.1 nicm 44: screen_reinit(s);
45: }
46:
47: /* Reinitialise screen. */
48: void
49: screen_reinit(struct screen *s)
50: {
51: s->cx = 0;
52: s->cy = 0;
53:
54: s->rupper = 0;
55: s->rlower = screen_size_y(s) - 1;
56:
1.16 nicm 57: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 58:
1.3 nicm 59: screen_reset_tabs(s);
1.1 nicm 60:
1.6 nicm 61: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
1.1 nicm 62:
63: screen_clear_selection(s);
64: }
65:
66: /* Destroy a screen. */
67: void
68: screen_free(struct screen *s)
69: {
1.39 nicm 70: free(s->dirty);
1.23 nicm 71: free(s->tabs);
72: free(s->title);
73: free(s->ccolour);
1.1 nicm 74: grid_destroy(s->grid);
75: }
76:
1.3 nicm 77: /* Reset tabs to default, eight spaces apart. */
78: void
79: screen_reset_tabs(struct screen *s)
80: {
81: u_int i;
82:
1.23 nicm 83: free(s->tabs);
1.3 nicm 84:
85: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
86: fatal("bit_alloc failed");
87: for (i = 8; i < screen_size_x(s); i += 8)
88: bit_set(s->tabs, i);
1.21 nicm 89: }
90:
91: /* Set screen cursor style. */
92: void
93: screen_set_cursor_style(struct screen *s, u_int style)
94: {
1.22 nicm 95: if (style <= 6)
1.21 nicm 96: s->cstyle = style;
1.20 nicm 97: }
98:
99: /* Set screen cursor colour. */
100: void
1.36 nicm 101: screen_set_cursor_colour(struct screen *s, const char *colour)
1.20 nicm 102: {
1.23 nicm 103: free(s->ccolour);
1.36 nicm 104: s->ccolour = xstrdup(colour);
1.3 nicm 105: }
106:
1.1 nicm 107: /* Set screen title. */
108: void
109: screen_set_title(struct screen *s, const char *title)
110: {
1.23 nicm 111: free(s->title);
1.27 nicm 112: s->title = xstrdup(title);
1.1 nicm 113: }
114:
115: /* Resize screen. */
116: void
1.24 nicm 117: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 118: {
119: if (sx < 1)
120: sx = 1;
121: if (sy < 1)
122: sy = 1;
123:
1.3 nicm 124: if (sx != screen_size_x(s)) {
1.1 nicm 125: screen_resize_x(s, sx);
1.3 nicm 126:
127: /*
128: * It is unclear what should happen to tabs on resize. xterm
129: * seems to try and maintain them, rxvt resets them. Resetting
130: * is simpler and more reliable so let's do that.
131: */
132: screen_reset_tabs(s);
133: }
134:
1.1 nicm 135: if (sy != screen_size_y(s))
136: screen_resize_y(s, sy);
1.24 nicm 137:
138: if (reflow)
139: screen_reflow(s, sx);
1.1 nicm 140: }
141:
142: void
143: screen_resize_x(struct screen *s, u_int sx)
144: {
145: struct grid *gd = s->grid;
146:
147: if (sx == 0)
148: fatalx("zero size");
149:
1.7 nicm 150: /*
151: * Treat resizing horizontally simply: just ensure the cursor is
152: * on-screen and change the size. Don't bother to truncate any lines -
1.38 nicm 153: * then the data should be accessible if the size is then increased.
1.7 nicm 154: *
155: * The only potential wrinkle is if UTF-8 double-width characters are
156: * left in the last column, but UTF-8 terminals should deal with this
157: * sanely.
158: */
1.1 nicm 159: if (s->cx >= sx)
160: s->cx = sx - 1;
161: gd->sx = sx;
162: }
163:
164: void
165: screen_resize_y(struct screen *s, u_int sy)
166: {
167: struct grid *gd = s->grid;
1.4 nicm 168: u_int needed, available, oldy, i;
1.1 nicm 169:
170: if (sy == 0)
171: fatalx("zero size");
1.4 nicm 172: oldy = screen_size_y(s);
173:
1.12 nicm 174: /*
1.4 nicm 175: * When resizing:
176: *
177: * If the height is decreasing, delete lines from the bottom until
178: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 179: *
1.40 ! nicm 180: * When increasing, pull as many lines as possible from scrolled
! 181: * history (not explicitly cleared from view) to the top, then fill the
! 182: * remaining with blanks at the bottom.
1.4 nicm 183: */
1.1 nicm 184:
185: /* Size decreasing. */
1.4 nicm 186: if (sy < oldy) {
187: needed = oldy - sy;
1.1 nicm 188:
1.4 nicm 189: /* Delete as many lines as possible from the bottom. */
190: available = oldy - 1 - s->cy;
191: if (available > 0) {
192: if (available > needed)
193: available = needed;
194: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 195: }
1.4 nicm 196: needed -= available;
1.1 nicm 197:
1.4 nicm 198: /*
1.8 nicm 199: * Now just increase the history size, if possible, to take
200: * over the lines which are left. If history is off, delete
201: * lines from the top.
1.4 nicm 202: */
1.8 nicm 203: available = s->cy;
1.40 ! nicm 204: if (gd->flags & GRID_HISTORY) {
! 205: gd->hscrolled += needed;
1.8 nicm 206: gd->hsize += needed;
1.40 ! nicm 207: } else if (needed > 0 && available > 0) {
1.8 nicm 208: if (available > needed)
209: available = needed;
210: grid_view_delete_lines(gd, 0, available);
211: }
1.4 nicm 212: s->cy -= needed;
1.12 nicm 213: }
1.1 nicm 214:
215: /* Resize line arrays. */
1.30 nicm 216: gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
217: sizeof *gd->linedata);
1.1 nicm 218:
219: /* Size increasing. */
1.4 nicm 220: if (sy > oldy) {
221: needed = sy - oldy;
222:
1.8 nicm 223: /*
1.40 ! nicm 224: * Try to pull as much as possible out of scrolled history, if is
1.8 nicm 225: * is enabled.
226: */
1.40 ! nicm 227: available = gd->hscrolled;
1.8 nicm 228: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 229: if (available > needed)
230: available = needed;
1.40 ! nicm 231: gd->hscrolled -= available;
1.4 nicm 232: gd->hsize -= available;
233: s->cy += available;
1.8 nicm 234: } else
235: available = 0;
1.4 nicm 236: needed -= available;
237:
238: /* Then fill the rest in with blanks. */
1.11 nicm 239: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
240: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 241: }
242:
1.4 nicm 243: /* Set the new size, and reset the scroll region. */
1.1 nicm 244: gd->sy = sy;
245: s->rupper = 0;
246: s->rlower = screen_size_y(s) - 1;
247: }
248:
249: /* Set selection. */
250: void
1.14 nicm 251: screen_set_selection(struct screen *s, u_int sx, u_int sy,
252: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 253: {
254: struct screen_sel *sel = &s->sel;
255:
256: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 257: sel->flag = 1;
1.14 nicm 258: sel->rectflag = rectflag;
1.13 nicm 259:
1.14 nicm 260: sel->sx = sx; sel->sy = sy;
261: sel->ex = ex; sel->ey = ey;
1.1 nicm 262: }
263:
264: /* Clear selection. */
265: void
266: screen_clear_selection(struct screen *s)
267: {
268: struct screen_sel *sel = &s->sel;
269:
270: sel->flag = 0;
1.32 nicm 271: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 272: }
273:
274: /* Check if cell in selection. */
275: int
276: screen_check_selection(struct screen *s, u_int px, u_int py)
277: {
278: struct screen_sel *sel = &s->sel;
1.28 nicm 279: u_int xx;
1.1 nicm 280:
1.14 nicm 281: if (!sel->flag)
1.1 nicm 282: return (0);
283:
1.14 nicm 284: if (sel->rectflag) {
285: if (sel->sy < sel->ey) {
286: /* start line < end line -- downward selection. */
287: if (py < sel->sy || py > sel->ey)
288: return (0);
289: } else if (sel->sy > sel->ey) {
290: /* start line > end line -- upward selection. */
291: if (py > sel->sy || py < sel->ey)
292: return (0);
293: } else {
294: /* starting line == ending line. */
295: if (py != sel->sy)
296: return (0);
297: }
298:
299: /*
300: * Need to include the selection start row, but not the cursor
301: * row, which means the selection changes depending on which
302: * one is on the left.
303: */
304: if (sel->ex < sel->sx) {
305: /* Cursor (ex) is on the left. */
1.17 nicm 306: if (px < sel->ex)
1.14 nicm 307: return (0);
308:
309: if (px > sel->sx)
310: return (0);
311: } else {
312: /* Selection start (sx) is on the left. */
313: if (px < sel->sx)
314: return (0);
315:
1.17 nicm 316: if (px > sel->ex)
1.14 nicm 317: return (0);
318: }
319: } else {
320: /*
321: * Like emacs, keep the top-left-most character, and drop the
322: * bottom-right-most, regardless of copy direction.
323: */
324: if (sel->sy < sel->ey) {
325: /* starting line < ending line -- downward selection. */
326: if (py < sel->sy || py > sel->ey)
327: return (0);
328:
1.28 nicm 329: if (py == sel->sy && px < sel->sx)
1.29 nicm 330: return (0);
1.28 nicm 331:
332: if (py == sel->ey && px > sel->ex)
1.14 nicm 333: return (0);
334: } else if (sel->sy > sel->ey) {
335: /* starting line > ending line -- upward selection. */
336: if (py > sel->sy || py < sel->ey)
337: return (0);
338:
1.28 nicm 339: if (py == sel->ey && px < sel->ex)
340: return (0);
341:
342: if (sel->modekeys == MODEKEY_EMACS)
343: xx = sel->sx - 1;
344: else
345: xx = sel->sx;
346: if (py == sel->sy && px > xx)
1.14 nicm 347: return (0);
348: } else {
349: /* starting line == ending line. */
350: if (py != sel->sy)
351: return (0);
352:
353: if (sel->ex < sel->sx) {
354: /* cursor (ex) is on the left */
1.28 nicm 355: if (sel->modekeys == MODEKEY_EMACS)
356: xx = sel->sx - 1;
357: else
358: xx = sel->sx;
359: if (px > xx || px < sel->ex)
1.14 nicm 360: return (0);
361: } else {
362: /* selection start (sx) is on the left */
363: if (px < sel->sx || px > sel->ex)
364: return (0);
365: }
366: }
1.1 nicm 367: }
368:
369: return (1);
1.24 nicm 370: }
371:
372: /* Reflow wrapped lines. */
373: void
1.25 nicm 374: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 375: {
1.25 nicm 376: struct grid *old = s->grid;
1.26 nicm 377: u_int change;
1.24 nicm 378:
1.25 nicm 379: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 380:
381: change = grid_reflow(s->grid, old, new_x);
382: if (change < s->cy)
383: s->cy -= change;
384: else
385: s->cy = 0;
1.1 nicm 386: }
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