Annotation of src/usr.bin/tmux/screen.c, Revision 1.33
1.33 ! deraadt 1: /* $OpenBSD: screen.c,v 1.32 2014/11/06 09:17:25 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: {
1.33 ! deraadt 34: char host[HOST_NAME_MAX+1];
1.15 beck 35:
1.1 nicm 36: s->grid = grid_create(sx, sy, hlimit);
37:
1.33 ! deraadt 38: if (gethostname(host, sizeof(host)) == 0)
1.31 nicm 39: s->title = xstrdup(host);
1.15 beck 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: {
1.23 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:
144: void
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 -
155: * then the data should be accessible if the size is then incrased.
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:
166: void
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: *
1.4 nicm 182: * When increasing, pull as many lines as possible from the history to
183: * the top, then fill the remaining with blanks at the bottom.
184: */
1.1 nicm 185:
186: /* Size decreasing. */
1.4 nicm 187: if (sy < oldy) {
188: needed = oldy - sy;
1.1 nicm 189:
1.4 nicm 190: /* Delete as many lines as possible from the bottom. */
191: available = oldy - 1 - s->cy;
192: if (available > 0) {
193: if (available > needed)
194: available = needed;
195: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 196: }
1.4 nicm 197: needed -= available;
1.1 nicm 198:
1.4 nicm 199: /*
1.8 nicm 200: * Now just increase the history size, if possible, to take
201: * over the lines which are left. If history is off, delete
202: * lines from the top.
203: *
204: * XXX Should apply history limit?
1.4 nicm 205: */
1.8 nicm 206: available = s->cy;
207: if (gd->flags & GRID_HISTORY)
208: gd->hsize += needed;
1.9 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: /*
226: * Try to pull as much as possible out of the history, if is
227: * is enabled.
228: */
1.4 nicm 229: available = gd->hsize;
1.8 nicm 230: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 231: if (available > needed)
232: available = needed;
233: gd->hsize -= available;
234: s->cy += available;
1.8 nicm 235: } else
236: available = 0;
1.4 nicm 237: needed -= available;
238:
239: /* Then fill the rest in with blanks. */
1.11 nicm 240: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
241: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 242: }
243:
1.4 nicm 244: /* Set the new size, and reset the scroll region. */
1.1 nicm 245: gd->sy = sy;
246: s->rupper = 0;
247: s->rlower = screen_size_y(s) - 1;
248: }
249:
250: /* Set selection. */
251: void
1.14 nicm 252: screen_set_selection(struct screen *s, u_int sx, u_int sy,
253: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 254: {
255: struct screen_sel *sel = &s->sel;
256:
257: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 258: sel->flag = 1;
1.14 nicm 259: sel->rectflag = rectflag;
1.13 nicm 260:
1.14 nicm 261: sel->sx = sx; sel->sy = sy;
262: sel->ex = ex; sel->ey = ey;
1.1 nicm 263: }
264:
265: /* Clear selection. */
266: void
267: screen_clear_selection(struct screen *s)
268: {
269: struct screen_sel *sel = &s->sel;
270:
271: sel->flag = 0;
1.32 nicm 272: sel->lineflag = LINE_SEL_NONE;
1.1 nicm 273: }
274:
275: /* Check if cell in selection. */
276: int
277: screen_check_selection(struct screen *s, u_int px, u_int py)
278: {
279: struct screen_sel *sel = &s->sel;
1.28 nicm 280: u_int xx;
1.1 nicm 281:
1.14 nicm 282: if (!sel->flag)
1.1 nicm 283: return (0);
284:
1.14 nicm 285: if (sel->rectflag) {
286: if (sel->sy < sel->ey) {
287: /* start line < end line -- downward selection. */
288: if (py < sel->sy || py > sel->ey)
289: return (0);
290: } else if (sel->sy > sel->ey) {
291: /* start line > end line -- upward selection. */
292: if (py > sel->sy || py < sel->ey)
293: return (0);
294: } else {
295: /* starting line == ending line. */
296: if (py != sel->sy)
297: return (0);
298: }
299:
300: /*
301: * Need to include the selection start row, but not the cursor
302: * row, which means the selection changes depending on which
303: * one is on the left.
304: */
305: if (sel->ex < sel->sx) {
306: /* Cursor (ex) is on the left. */
1.17 nicm 307: if (px < sel->ex)
1.14 nicm 308: return (0);
309:
310: if (px > sel->sx)
311: return (0);
312: } else {
313: /* Selection start (sx) is on the left. */
314: if (px < sel->sx)
315: return (0);
316:
1.17 nicm 317: if (px > sel->ex)
1.14 nicm 318: return (0);
319: }
320: } else {
321: /*
322: * Like emacs, keep the top-left-most character, and drop the
323: * bottom-right-most, regardless of copy direction.
324: */
325: if (sel->sy < sel->ey) {
326: /* starting line < ending line -- downward selection. */
327: if (py < sel->sy || py > sel->ey)
328: return (0);
329:
1.28 nicm 330: if (py == sel->sy && px < sel->sx)
1.29 nicm 331: return (0);
1.28 nicm 332:
333: if (py == sel->ey && px > sel->ex)
1.14 nicm 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:
1.28 nicm 340: if (py == sel->ey && px < sel->ex)
341: return (0);
342:
343: if (sel->modekeys == MODEKEY_EMACS)
344: xx = sel->sx - 1;
345: else
346: xx = sel->sx;
347: if (py == sel->sy && px > xx)
1.14 nicm 348: return (0);
349: } else {
350: /* starting line == ending line. */
351: if (py != sel->sy)
352: return (0);
353:
354: if (sel->ex < sel->sx) {
355: /* cursor (ex) is on the left */
1.28 nicm 356: if (sel->modekeys == MODEKEY_EMACS)
357: xx = sel->sx - 1;
358: else
359: xx = sel->sx;
360: if (px > xx || px < sel->ex)
1.14 nicm 361: return (0);
362: } else {
363: /* selection start (sx) is on the left */
364: if (px < sel->sx || px > sel->ex)
365: return (0);
366: }
367: }
1.1 nicm 368: }
369:
370: return (1);
1.24 nicm 371: }
372:
373: /* Reflow wrapped lines. */
374: void
1.25 nicm 375: screen_reflow(struct screen *s, u_int new_x)
1.24 nicm 376: {
1.25 nicm 377: struct grid *old = s->grid;
1.26 nicm 378: u_int change;
1.24 nicm 379:
1.25 nicm 380: s->grid = grid_create(old->sx, old->sy, old->hlimit);
1.26 nicm 381:
382: change = grid_reflow(s->grid, old, new_x);
383: if (change < s->cy)
384: s->cy -= change;
385: else
386: s->cy = 0;
1.1 nicm 387: }
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