Annotation of src/usr.bin/tmux/screen.c, Revision 1.19
1.19 ! nicm 1: /* $OpenBSD: screen.c,v 1.18 2011/05/04 17:43:11 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:
1.3 nicm 43: s->tabs = NULL;
44:
1.1 nicm 45: screen_reinit(s);
46: }
47:
48: /* Reinitialise screen. */
49: void
50: screen_reinit(struct screen *s)
51: {
52: s->cx = 0;
53: s->cy = 0;
54:
55: s->rupper = 0;
56: s->rlower = screen_size_y(s) - 1;
57:
1.16 nicm 58: s->mode = MODE_CURSOR | MODE_WRAP;
1.12 nicm 59:
1.3 nicm 60: screen_reset_tabs(s);
1.1 nicm 61:
1.6 nicm 62: grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy);
1.1 nicm 63:
64: screen_clear_selection(s);
65: }
66:
67: /* Destroy a screen. */
68: void
69: screen_free(struct screen *s)
70: {
1.10 nicm 71: if (s->tabs != NULL)
72: xfree(s->tabs);
1.1 nicm 73: xfree(s->title);
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:
83: if (s->tabs != NULL)
84: xfree(s->tabs);
85:
86: if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
87: fatal("bit_alloc failed");
88: for (i = 8; i < screen_size_x(s); i += 8)
89: bit_set(s->tabs, i);
90: }
91:
1.1 nicm 92: /* Set screen title. */
93: void
94: screen_set_title(struct screen *s, const char *title)
95: {
1.2 nicm 96: char tmp[BUFSIZ];
97:
1.18 nicm 98: strlcpy(tmp, title, sizeof tmp);
1.2 nicm 99:
1.1 nicm 100: xfree(s->title);
1.2 nicm 101: s->title = xstrdup(tmp);
1.1 nicm 102: }
103:
104: /* Resize screen. */
105: void
106: screen_resize(struct screen *s, u_int sx, u_int sy)
107: {
108: if (sx < 1)
109: sx = 1;
110: if (sy < 1)
111: sy = 1;
112:
1.3 nicm 113: if (sx != screen_size_x(s)) {
1.1 nicm 114: screen_resize_x(s, sx);
1.3 nicm 115:
116: /*
117: * It is unclear what should happen to tabs on resize. xterm
118: * seems to try and maintain them, rxvt resets them. Resetting
119: * is simpler and more reliable so let's do that.
120: */
121: screen_reset_tabs(s);
122: }
123:
1.1 nicm 124: if (sy != screen_size_y(s))
125: screen_resize_y(s, sy);
126: }
127:
128: void
129: screen_resize_x(struct screen *s, u_int sx)
130: {
131: struct grid *gd = s->grid;
132:
133: if (sx == 0)
134: fatalx("zero size");
135:
1.7 nicm 136: /*
137: * Treat resizing horizontally simply: just ensure the cursor is
138: * on-screen and change the size. Don't bother to truncate any lines -
139: * then the data should be accessible if the size is then incrased.
140: *
141: * The only potential wrinkle is if UTF-8 double-width characters are
142: * left in the last column, but UTF-8 terminals should deal with this
143: * sanely.
144: */
1.1 nicm 145: if (s->cx >= sx)
146: s->cx = sx - 1;
147: gd->sx = sx;
148: }
149:
150: void
151: screen_resize_y(struct screen *s, u_int sy)
152: {
153: struct grid *gd = s->grid;
1.4 nicm 154: u_int needed, available, oldy, i;
1.1 nicm 155:
156: if (sy == 0)
157: fatalx("zero size");
1.4 nicm 158: oldy = screen_size_y(s);
159:
1.12 nicm 160: /*
1.4 nicm 161: * When resizing:
162: *
163: * If the height is decreasing, delete lines from the bottom until
164: * hitting the cursor, then push lines from the top into the history.
1.12 nicm 165: *
1.4 nicm 166: * When increasing, pull as many lines as possible from the history to
167: * the top, then fill the remaining with blanks at the bottom.
168: */
1.1 nicm 169:
170: /* Size decreasing. */
1.4 nicm 171: if (sy < oldy) {
172: needed = oldy - sy;
1.1 nicm 173:
1.4 nicm 174: /* Delete as many lines as possible from the bottom. */
175: available = oldy - 1 - s->cy;
176: if (available > 0) {
177: if (available > needed)
178: available = needed;
179: grid_view_delete_lines(gd, oldy - available, available);
1.1 nicm 180: }
1.4 nicm 181: needed -= available;
1.1 nicm 182:
1.4 nicm 183: /*
1.8 nicm 184: * Now just increase the history size, if possible, to take
185: * over the lines which are left. If history is off, delete
186: * lines from the top.
187: *
188: * XXX Should apply history limit?
1.4 nicm 189: */
1.8 nicm 190: available = s->cy;
191: if (gd->flags & GRID_HISTORY)
192: gd->hsize += needed;
1.9 nicm 193: else if (needed > 0 && available > 0) {
1.8 nicm 194: if (available > needed)
195: available = needed;
196: grid_view_delete_lines(gd, 0, available);
197: }
1.4 nicm 198: s->cy -= needed;
1.12 nicm 199: }
1.1 nicm 200:
201: /* Resize line arrays. */
1.11 nicm 202: gd->linedata = xrealloc(
203: gd->linedata, gd->hsize + sy, sizeof *gd->linedata);
1.1 nicm 204:
205: /* Size increasing. */
1.4 nicm 206: if (sy > oldy) {
207: needed = sy - oldy;
208:
1.8 nicm 209: /*
210: * Try to pull as much as possible out of the history, if is
211: * is enabled.
212: */
1.4 nicm 213: available = gd->hsize;
1.8 nicm 214: if (gd->flags & GRID_HISTORY && available > 0) {
1.4 nicm 215: if (available > needed)
216: available = needed;
217: gd->hsize -= available;
218: s->cy += available;
1.8 nicm 219: } else
220: available = 0;
1.4 nicm 221: needed -= available;
222:
223: /* Then fill the rest in with blanks. */
1.11 nicm 224: for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++)
225: memset(&gd->linedata[i], 0, sizeof gd->linedata[i]);
1.1 nicm 226: }
227:
1.4 nicm 228: /* Set the new size, and reset the scroll region. */
1.1 nicm 229: gd->sy = sy;
230: s->rupper = 0;
231: s->rlower = screen_size_y(s) - 1;
232: }
233:
234: /* Set selection. */
235: void
1.14 nicm 236: screen_set_selection(struct screen *s, u_int sx, u_int sy,
237: u_int ex, u_int ey, u_int rectflag, struct grid_cell *gc)
1.1 nicm 238: {
239: struct screen_sel *sel = &s->sel;
240:
241: memcpy(&sel->cell, gc, sizeof sel->cell);
1.13 nicm 242: sel->flag = 1;
1.14 nicm 243: sel->rectflag = rectflag;
1.13 nicm 244:
1.14 nicm 245: sel->sx = sx; sel->sy = sy;
246: sel->ex = ex; sel->ey = ey;
1.1 nicm 247: }
248:
249: /* Clear selection. */
250: void
251: screen_clear_selection(struct screen *s)
252: {
253: struct screen_sel *sel = &s->sel;
254:
255: sel->flag = 0;
256: }
257:
258: /* Check if cell in selection. */
259: int
260: screen_check_selection(struct screen *s, u_int px, u_int py)
261: {
262: struct screen_sel *sel = &s->sel;
263:
1.14 nicm 264: if (!sel->flag)
1.1 nicm 265: return (0);
266:
1.14 nicm 267: if (sel->rectflag) {
268: if (sel->sy < sel->ey) {
269: /* start line < end line -- downward selection. */
270: if (py < sel->sy || py > sel->ey)
271: return (0);
272: } else if (sel->sy > sel->ey) {
273: /* start line > end line -- upward selection. */
274: if (py > sel->sy || py < sel->ey)
275: return (0);
276: } else {
277: /* starting line == ending line. */
278: if (py != sel->sy)
279: return (0);
280: }
281:
282: /*
283: * Need to include the selection start row, but not the cursor
284: * row, which means the selection changes depending on which
285: * one is on the left.
286: */
287: if (sel->ex < sel->sx) {
288: /* Cursor (ex) is on the left. */
1.17 nicm 289: if (px < sel->ex)
1.14 nicm 290: return (0);
291:
292: if (px > sel->sx)
293: return (0);
294: } else {
295: /* Selection start (sx) is on the left. */
296: if (px < sel->sx)
297: return (0);
298:
1.17 nicm 299: if (px > sel->ex)
1.14 nicm 300: return (0);
301: }
302: } else {
303: /*
304: * Like emacs, keep the top-left-most character, and drop the
305: * bottom-right-most, regardless of copy direction.
306: */
307: if (sel->sy < sel->ey) {
308: /* starting line < ending line -- downward selection. */
309: if (py < sel->sy || py > sel->ey)
310: return (0);
311:
312: if ((py == sel->sy && px < sel->sx)
313: || (py == sel->ey && px > sel->ex))
314: return (0);
315: } else if (sel->sy > sel->ey) {
316: /* starting line > ending line -- upward selection. */
317: if (py > sel->sy || py < sel->ey)
318: return (0);
319:
320: if ((py == sel->sy && px >= sel->sx)
321: || (py == sel->ey && px < sel->ex))
322: return (0);
323: } else {
324: /* starting line == ending line. */
325: if (py != sel->sy)
326: return (0);
327:
328: if (sel->ex < sel->sx) {
329: /* cursor (ex) is on the left */
330: if (px > sel->sx || px < sel->ex)
331: return (0);
332: } else {
333: /* selection start (sx) is on the left */
334: if (px < sel->sx || px > sel->ex)
335: return (0);
336: }
337: }
1.1 nicm 338: }
339:
340: return (1);
341: }
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