Annotation of src/usr.bin/tmux/screen.c, Revision 1.22
1.22 ! nicm 1: /* $OpenBSD: screen.c,v 1.21 2011/05/20 19:17:39 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: {
1.10 nicm 73: if (s->tabs != NULL)
74: xfree(s->tabs);
1.1 nicm 75: xfree(s->title);
1.20 nicm 76: xfree(s->ccolour);
1.1 nicm 77: grid_destroy(s->grid);
78: }
79:
1.3 nicm 80: /* Reset tabs to default, eight spaces apart. */
81: void
82: screen_reset_tabs(struct screen *s)
83: {
84: u_int i;
85:
86: if (s->tabs != NULL)
87: xfree(s->tabs);
88:
89: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
90: fatal("bit_alloc failed");
91: for (i = 8; i < screen_size_x(s); i += 8)
92: bit_set(s->tabs, i);
1.21 nicm 93: }
94:
95: /* Set screen cursor style. */
96: void
97: screen_set_cursor_style(struct screen *s, u_int style)
98: {
1.22 ! nicm 99: if (style <= 6)
1.21 nicm 100: s->cstyle = style;
1.20 nicm 101: }
102:
103: /* Set screen cursor colour. */
104: void
105: screen_set_cursor_colour(struct screen *s, const char *colour_string)
106: {
107: xfree(s->ccolour);
108: s->ccolour = xstrdup(colour_string);
1.3 nicm 109: }
110:
1.1 nicm 111: /* Set screen title. */
112: void
113: screen_set_title(struct screen *s, const char *title)
114: {
1.2 nicm 115: char tmp[BUFSIZ];
116:
1.18 nicm 117: strlcpy(tmp, title, sizeof tmp);
1.2 nicm 118:
1.1 nicm 119: xfree(s->title);
1.2 nicm 120: s->title = xstrdup(tmp);
1.1 nicm 121: }
122:
123: /* Resize screen. */
124: void
125: screen_resize(struct screen *s, u_int sx, u_int sy)
126: {
127: if (sx < 1)
128: sx = 1;
129: if (sy < 1)
130: sy = 1;
131:
1.3 nicm 132: if (sx != screen_size_x(s)) {
1.1 nicm 133: screen_resize_x(s, sx);
1.3 nicm 134:
135: /*
136: * It is unclear what should happen to tabs on resize. xterm
137: * seems to try and maintain them, rxvt resets them. Resetting
138: * is simpler and more reliable so let's do that.
139: */
140: screen_reset_tabs(s);
141: }
142:
1.1 nicm 143: if (sy != screen_size_y(s))
144: screen_resize_y(s, sy);
145: }
146:
147: void
148: screen_resize_x(struct screen *s, u_int sx)
149: {
150: struct grid *gd = s->grid;
151:
152: if (sx == 0)
153: fatalx("zero size");
154:
1.7 nicm 155: /*
156: * Treat resizing horizontally simply: just ensure the cursor is
157: * on-screen and change the size. Don't bother to truncate any lines -
158: * then the data should be accessible if the size is then incrased.
159: *
160: * The only potential wrinkle is if UTF-8 double-width characters are
161: * left in the last column, but UTF-8 terminals should deal with this
162: * sanely.
163: */
1.1 nicm 164: if (s->cx >= sx)
165: s->cx = sx - 1;
166: gd->sx = sx;
167: }
168:
169: void
170: screen_resize_y(struct screen *s, u_int sy)
171: {
172: struct grid *gd = s->grid;
1.4 nicm 173: u_int needed, available, oldy, i;
1.1 nicm 174:
175: if (sy == 0)
176: fatalx("zero size");
1.4 nicm 177: oldy = screen_size_y(s);
178:
1.12 nicm 179: /*
1.4 nicm 180: * When resizing:
181: *
182: * If the height is decreasing, delete lines from the bottom until
183: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 184: *
1.4 nicm 185: * When increasing, pull as many lines as possible from the history to
186: * the top, then fill the remaining with blanks at the bottom.
187: */
1.1 nicm 188:
189: /* Size decreasing. */
1.4 nicm 190: if (sy < oldy) {
191: needed = oldy - sy;
1.1 nicm 192:
1.4 nicm 193: /* Delete as many lines as possible from the bottom. */
194: available = oldy - 1 - s->cy;
195: if (available > 0) {
196: if (available > needed)
197: available = needed;
198: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 199: }
1.4 nicm 200: needed -= available;
1.1 nicm 201:
1.4 nicm 202: /*
1.8 nicm 203: * Now just increase the history size, if possible, to take
204: * over the lines which are left. If history is off, delete
205: * lines from the top.
206: *
207: * XXX Should apply history limit?
1.4 nicm 208: */
1.8 nicm 209: available = s->cy;
210: if (gd->flags & GRID_HISTORY)
211: gd->hsize += needed;
1.9 nicm 212: else if (needed > 0 && available > 0) {
1.8 nicm 213: if (available > needed)
214: available = needed;
215: grid_view_delete_lines(gd, 0, available);
216: }
1.4 nicm 217: s->cy -= needed;
1.12 nicm 218: }
1.1 nicm 219:
220: /* Resize line arrays. */
1.11 nicm 221: gd->linedata = xrealloc(
222: gd->linedata, gd->hsize + sy, sizeof *gd->linedata);
1.1 nicm 223:
224: /* Size increasing. */
1.4 nicm 225: if (sy > oldy) {
226: needed = sy - oldy;
227:
1.8 nicm 228: /*
229: * Try to pull as much as possible out of the history, if is
230: * is enabled.
231: */
1.4 nicm 232: available = gd->hsize;
1.8 nicm 233: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 234: if (available > needed)
235: available = needed;
236: gd->hsize -= available;
237: s->cy += available;
1.8 nicm 238: } else
239: available = 0;
1.4 nicm 240: needed -= available;
241:
242: /* Then fill the rest in with blanks. */
1.11 nicm 243: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
244: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 245: }
246:
1.4 nicm 247: /* Set the new size, and reset the scroll region. */
1.1 nicm 248: gd->sy = sy;
249: s->rupper = 0;
250: s->rlower = screen_size_y(s) - 1;
251: }
252:
253: /* Set selection. */
254: void
1.14 nicm 255: screen_set_selection(struct screen *s, u_int sx, u_int sy,
256: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 257: {
258: struct screen_sel *sel = &s->sel;
259:
260: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 261: sel->flag = 1;
1.14 nicm 262: sel->rectflag = rectflag;
1.13 nicm 263:
1.14 nicm 264: sel->sx = sx; sel->sy = sy;
265: sel->ex = ex; sel->ey = ey;
1.1 nicm 266: }
267:
268: /* Clear selection. */
269: void
270: screen_clear_selection(struct screen *s)
271: {
272: struct screen_sel *sel = &s->sel;
273:
274: sel->flag = 0;
275: }
276:
277: /* Check if cell in selection. */
278: int
279: screen_check_selection(struct screen *s, u_int px, u_int py)
280: {
281: struct screen_sel *sel = &s->sel;
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:
331: if ((py == sel->sy && px < sel->sx)
332: || (py == sel->ey && px > sel->ex))
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:
339: if ((py == sel->sy && px >= sel->sx)
340: || (py == sel->ey && px < sel->ex))
341: return (0);
342: } else {
343: /* starting line == ending line. */
344: if (py != sel->sy)
345: return (0);
346:
347: if (sel->ex < sel->sx) {
348: /* cursor (ex) is on the left */
349: if (px > sel->sx || px < sel->ex)
350: return (0);
351: } else {
352: /* selection start (sx) is on the left */
353: if (px < sel->sx || px > sel->ex)
354: return (0);
355: }
356: }
1.1 nicm 357: }
358:
359: return (1);
360: }
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