Annotation of src/usr.bin/tmux/screen.c, Revision 1.42
1.42 ! nicm 1: /* $OpenBSD: screen.c,v 1.41 2016/10/10 21:29:23 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:
1.6 nicm 63: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
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;
196: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 197: }
1.4 nicm 198: needed -= available;
1.1 nicm 199:
1.4 nicm 200: /*
1.8 nicm 201: * Now just increase the history size, if possible, to take
202: * over the lines which are left. If history is off, delete
203: * lines from the top.
1.4 nicm 204: */
1.8 nicm 205: available = s->cy;
1.40 nicm 206: if (gd->flags & GRID_HISTORY) {
207: gd->hscrolled += needed;
1.8 nicm 208: gd->hsize += needed;
1.40 nicm 209: } else if (needed > 0 && available > 0) {
1.8 nicm 210: if (available > needed)
211: available = needed;
212: grid_view_delete_lines(gd, 0, available);
213: }
1.4 nicm 214: s->cy -= needed;
1.12 nicm 215: }
1.1 nicm 216:
217: /* Resize line arrays. */
1.30 nicm 218: gd->linedata = xreallocarray(gd->linedata, gd->hsize + sy,
219: sizeof *gd->linedata);
1.1 nicm 220:
221: /* Size increasing. */
1.4 nicm 222: if (sy > oldy) {
223: needed = sy - oldy;
224:
1.8 nicm 225: /*
1.41 nicm 226: * Try to pull as much as possible out of scrolled history, if
227: * is is enabled.
1.8 nicm 228: */
1.40 nicm 229: available = gd->hscrolled;
1.8 nicm 230: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 231: if (available > needed)
232: available = needed;
1.40 nicm 233: gd->hscrolled -= available;
1.4 nicm 234: gd->hsize -= available;
235: s->cy += available;
1.8 nicm 236: } else
237: available = 0;
1.4 nicm 238: needed -= available;
239:
240: /* Then fill the rest in with blanks. */
1.11 nicm 241: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
242: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 243: }
244:
1.4 nicm 245: /* Set the new size, and reset the scroll region. */
1.1 nicm 246: gd->sy = sy;
247: s->rupper = 0;
248: s->rlower = screen_size_y(s) - 1;
249: }
250:
251: /* Set selection. */
252: void
1.14 nicm 253: screen_set_selection(struct screen *s, u_int sx, u_int sy,
254: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 255: {
256: struct screen_sel *sel = &s->sel;
257:
258: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 259: sel->flag = 1;
1.14 nicm 260: sel->rectflag = rectflag;
1.13 nicm 261:
1.14 nicm 262: sel->sx = sx; sel->sy = sy;
263: sel->ex = ex; sel->ey = ey;
1.1 nicm 264: }
265:
266: /* Clear selection. */
267: void
268: screen_clear_selection(struct screen *s)
269: {
270: struct screen_sel *sel = &s->sel;
271:
272: sel->flag = 0;
1.32 nicm 273: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 274: }
275:
276: /* Check if cell in selection. */
277: int
278: screen_check_selection(struct screen *s, u_int px, u_int py)
279: {
280: struct screen_sel *sel = &s->sel;
1.28 nicm 281: u_int xx;
1.1 nicm 282:
1.14 nicm 283: if (!sel->flag)
1.1 nicm 284: return (0);
285:
1.14 nicm 286: if (sel->rectflag) {
287: if (sel->sy < sel->ey) {
288: /* start line < end line -- downward selection. */
289: if (py < sel->sy || py > sel->ey)
290: return (0);
291: } else if (sel->sy > sel->ey) {
292: /* start line > end line -- upward selection. */
293: if (py > sel->sy || py < sel->ey)
294: return (0);
295: } else {
296: /* starting line == ending line. */
297: if (py != sel->sy)
298: return (0);
299: }
300:
301: /*
302: * Need to include the selection start row, but not the cursor
303: * row, which means the selection changes depending on which
304: * one is on the left.
305: */
306: if (sel->ex < sel->sx) {
307: /* Cursor (ex) is on the left. */
1.17 nicm 308: if (px < sel->ex)
1.14 nicm 309: return (0);
310:
311: if (px > sel->sx)
312: return (0);
313: } else {
314: /* Selection start (sx) is on the left. */
315: if (px < sel->sx)
316: return (0);
317:
1.17 nicm 318: if (px > sel->ex)
1.14 nicm 319: return (0);
320: }
321: } else {
322: /*
323: * Like emacs, keep the top-left-most character, and drop the
324: * bottom-right-most, regardless of copy direction.
325: */
326: if (sel->sy < sel->ey) {
327: /* starting line < ending line -- downward selection. */
328: if (py < sel->sy || py > sel->ey)
329: return (0);
330:
1.28 nicm 331: if (py == sel->sy && px < sel->sx)
1.29 nicm 332: return (0);
1.28 nicm 333:
334: if (py == sel->ey && px > sel->ex)
1.14 nicm 335: return (0);
336: } else if (sel->sy > sel->ey) {
337: /* starting line > ending line -- upward selection. */
338: if (py > sel->sy || py < sel->ey)
339: return (0);
340:
1.28 nicm 341: if (py == sel->ey && px < sel->ex)
342: return (0);
343:
344: if (sel->modekeys == MODEKEY_EMACS)
345: xx = sel->sx - 1;
346: else
347: xx = sel->sx;
348: if (py == sel->sy && px > xx)
1.14 nicm 349: return (0);
350: } else {
351: /* starting line == ending line. */
352: if (py != sel->sy)
353: return (0);
354:
355: if (sel->ex < sel->sx) {
356: /* cursor (ex) is on the left */
1.28 nicm 357: if (sel->modekeys == MODEKEY_EMACS)
358: xx = sel->sx - 1;
359: else
360: xx = sel->sx;
361: if (px > xx || px < sel->ex)
1.14 nicm 362: return (0);
363: } else {
364: /* selection start (sx) is on the left */
365: if (px < sel->sx || px > sel->ex)
366: return (0);
367: }
368: }
1.1 nicm 369: }
370:
371: return (1);
1.24 nicm 372: }
373:
374: /* Reflow wrapped lines. */
1.42 ! nicm 375: static void
1.25 nicm 376: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 377: {
1.25 nicm 378: struct grid *old = s->grid;
1.26 nicm 379: u_int change;
1.24 nicm 380:
1.25 nicm 381: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 382:
383: change = grid_reflow(s->grid, old, new_x);
384: if (change < s->cy)
385: s->cy -= change;
386: else
387: s->cy = 0;
1.1 nicm 388: }
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