Annotation of src/usr.bin/tmux/screen.c, Revision 1.25
1.25 ! nicm 1: /* $OpenBSD: screen.c,v 1.24 2013/02/05 11:08:59 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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: {
1.15 beck 34: char hn[MAXHOSTNAMELEN];
35:
1.1 nicm 36: s->grid = grid_create(sx, sy, hlimit);
37:
1.15 beck 38: if (gethostname(hn, MAXHOSTNAMELEN) == 0)
39: s->title = xstrdup(hn);
40: else
41: s->title = xstrdup("");
1.1 nicm 42:
1.21 nicm 43: s->cstyle = 0;
1.20 nicm 44: s->ccolour = xstrdup("");
1.3 nicm 45: s->tabs = NULL;
46:
1.1 nicm 47: screen_reinit(s);
48: }
49:
50: /* Reinitialise screen. */
51: void
52: screen_reinit(struct screen *s)
53: {
54: s->cx = 0;
55: s->cy = 0;
56:
57: s->rupper = 0;
58: s->rlower = screen_size_y(s) - 1;
59:
1.16 nicm 60: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 61:
1.3 nicm 62: screen_reset_tabs(s);
1.1 nicm 63:
1.6 nicm 64: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
1.1 nicm 65:
66: screen_clear_selection(s);
67: }
68:
69: /* Destroy a screen. */
70: void
71: screen_free(struct screen *s)
72: {
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
103: screen_set_cursor_colour(struct screen *s, const char *colour_string)
104: {
1.23 nicm 105: free(s->ccolour);
1.20 nicm 106: s->ccolour = xstrdup(colour_string);
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: {
1.2 nicm 113: char tmp[BUFSIZ];
114:
1.18 nicm 115: strlcpy(tmp, title, sizeof tmp);
1.2 nicm 116:
1.23 nicm 117: free(s->title);
1.2 nicm 118: s->title = xstrdup(tmp);
1.1 nicm 119: }
120:
121: /* Resize screen. */
122: void
1.24 nicm 123: screen_resize(struct screen *s, u_int sx, u_int sy, int reflow)
1.1 nicm 124: {
125: if (sx < 1)
126: sx = 1;
127: if (sy < 1)
128: sy = 1;
129:
1.3 nicm 130: if (sx != screen_size_x(s)) {
1.1 nicm 131: screen_resize_x(s, sx);
1.3 nicm 132:
133: /*
134: * It is unclear what should happen to tabs on resize. xterm
135: * seems to try and maintain them, rxvt resets them. Resetting
136: * is simpler and more reliable so let's do that.
137: */
138: screen_reset_tabs(s);
139: }
140:
1.1 nicm 141: if (sy != screen_size_y(s))
142: screen_resize_y(s, sy);
1.24 nicm 143:
144: if (reflow)
145: screen_reflow(s, sx);
1.1 nicm 146: }
147:
148: void
149: screen_resize_x(struct screen *s, u_int sx)
150: {
151: struct grid *gd = s->grid;
152:
153: if (sx == 0)
154: fatalx("zero size");
155:
1.7 nicm 156: /*
157: * Treat resizing horizontally simply: just ensure the cursor is
158: * on-screen and change the size. Don't bother to truncate any lines -
159: * then the data should be accessible if the size is then incrased.
160: *
161: * The only potential wrinkle is if UTF-8 double-width characters are
162: * left in the last column, but UTF-8 terminals should deal with this
163: * sanely.
164: */
1.1 nicm 165: if (s->cx >= sx)
166: s->cx = sx - 1;
167: gd->sx = sx;
168: }
169:
170: void
171: screen_resize_y(struct screen *s, u_int sy)
172: {
173: struct grid *gd = s->grid;
1.4 nicm 174: u_int needed, available, oldy, i;
1.1 nicm 175:
176: if (sy == 0)
177: fatalx("zero size");
1.4 nicm 178: oldy = screen_size_y(s);
179:
1.12 nicm 180: /*
1.4 nicm 181: * When resizing:
182: *
183: * If the height is decreasing, delete lines from the bottom until
184: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 185: *
1.4 nicm 186: * When increasing, pull as many lines as possible from the history to
187: * the top, then fill the remaining with blanks at the bottom.
188: */
1.1 nicm 189:
190: /* Size decreasing. */
1.4 nicm 191: if (sy < oldy) {
192: needed = oldy - sy;
1.1 nicm 193:
1.4 nicm 194: /* Delete as many lines as possible from the bottom. */
195: available = oldy - 1 - s->cy;
196: if (available > 0) {
197: if (available > needed)
198: available = needed;
199: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 200: }
1.4 nicm 201: needed -= available;
1.1 nicm 202:
1.4 nicm 203: /*
1.8 nicm 204: * Now just increase the history size, if possible, to take
205: * over the lines which are left. If history is off, delete
206: * lines from the top.
207: *
208: * XXX Should apply history limit?
1.4 nicm 209: */
1.8 nicm 210: available = s->cy;
211: if (gd->flags & GRID_HISTORY)
212: gd->hsize += needed;
1.9 nicm 213: else if (needed > 0 && available > 0) {
1.8 nicm 214: if (available > needed)
215: available = needed;
216: grid_view_delete_lines(gd, 0, available);
217: }
1.4 nicm 218: s->cy -= needed;
1.12 nicm 219: }
1.1 nicm 220:
221: /* Resize line arrays. */
1.11 nicm 222: gd->linedata = xrealloc(
223: gd->linedata, gd->hsize + sy, sizeof *gd->linedata);
1.1 nicm 224:
225: /* Size increasing. */
1.4 nicm 226: if (sy > oldy) {
227: needed = sy - oldy;
228:
1.8 nicm 229: /*
230: * Try to pull as much as possible out of the history, if is
231: * is enabled.
232: */
1.4 nicm 233: available = gd->hsize;
1.8 nicm 234: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 235: if (available > needed)
236: available = needed;
237: gd->hsize -= available;
238: s->cy += available;
1.8 nicm 239: } else
240: available = 0;
1.4 nicm 241: needed -= available;
242:
243: /* Then fill the rest in with blanks. */
1.11 nicm 244: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
245: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 246: }
247:
1.4 nicm 248: /* Set the new size, and reset the scroll region. */
1.1 nicm 249: gd->sy = sy;
250: s->rupper = 0;
251: s->rlower = screen_size_y(s) - 1;
252: }
253:
254: /* Set selection. */
255: void
1.14 nicm 256: screen_set_selection(struct screen *s, u_int sx, u_int sy,
257: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 258: {
259: struct screen_sel *sel = &s->sel;
260:
261: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 262: sel->flag = 1;
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;
276: }
277:
278: /* Check if cell in selection. */
279: int
280: screen_check_selection(struct screen *s, u_int px, u_int py)
281: {
282: struct screen_sel *sel = &s->sel;
283:
1.14 nicm 284: if (!sel->flag)
1.1 nicm 285: return (0);
286:
1.14 nicm 287: if (sel->rectflag) {
288: if (sel->sy < sel->ey) {
289: /* start line < end line -- downward selection. */
290: if (py < sel->sy || py > sel->ey)
291: return (0);
292: } else if (sel->sy > sel->ey) {
293: /* start line > end line -- upward selection. */
294: if (py > sel->sy || py < sel->ey)
295: return (0);
296: } else {
297: /* starting line == ending line. */
298: if (py != sel->sy)
299: return (0);
300: }
301:
302: /*
303: * Need to include the selection start row, but not the cursor
304: * row, which means the selection changes depending on which
305: * one is on the left.
306: */
307: if (sel->ex < sel->sx) {
308: /* Cursor (ex) is on the left. */
1.17 nicm 309: if (px < sel->ex)
1.14 nicm 310: return (0);
311:
312: if (px > sel->sx)
313: return (0);
314: } else {
315: /* Selection start (sx) is on the left. */
316: if (px < sel->sx)
317: return (0);
318:
1.17 nicm 319: if (px > sel->ex)
1.14 nicm 320: return (0);
321: }
322: } else {
323: /*
324: * Like emacs, keep the top-left-most character, and drop the
325: * bottom-right-most, regardless of copy direction.
326: */
327: if (sel->sy < sel->ey) {
328: /* starting line < ending line -- downward selection. */
329: if (py < sel->sy || py > sel->ey)
330: return (0);
331:
332: if ((py == sel->sy && px < sel->sx)
333: || (py == sel->ey && px > sel->ex))
334: return (0);
335: } else if (sel->sy > sel->ey) {
336: /* starting line > ending line -- upward selection. */
337: if (py > sel->sy || py < sel->ey)
338: return (0);
339:
340: if ((py == sel->sy && px >= sel->sx)
341: || (py == sel->ey && px < sel->ex))
342: return (0);
343: } else {
344: /* starting line == ending line. */
345: if (py != sel->sy)
346: return (0);
347:
348: if (sel->ex < sel->sx) {
349: /* cursor (ex) is on the left */
350: if (px > sel->sx || px < sel->ex)
351: return (0);
352: } else {
353: /* selection start (sx) is on the left */
354: if (px < sel->sx || px > sel->ex)
355: return (0);
356: }
357: }
1.1 nicm 358: }
359:
360: return (1);
1.24 nicm 361: }
362:
363: /* Reflow wrapped lines. */
364: void
1.25 ! nicm 365: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 366: {
1.25 ! nicm 367: struct grid *old = s->grid;
1.24 nicm 368:
1.25 ! nicm 369: s->grid = grid_create(old->sx, old->sy, old->hlimit);
! 370: s->cy -= grid_reflow(s->grid, old, new_x);
1.1 nicm 371: }
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