Annotation of src/usr.bin/tmux/layout-custom.c, Revision 1.14
1.14 ! nicm 1: /* $OpenBSD: layout-custom.c,v 1.13 2019/06/12 08:08:33 nicm Exp $ */
1.1 nicm 2:
3: /*
1.8 nicm 4: * Copyright (c) 2010 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:
21: #include <ctype.h>
22: #include <string.h>
23:
24: #include "tmux.h"
25:
1.9 nicm 26: static struct layout_cell *layout_find_bottomright(struct layout_cell *);
27: static u_short layout_checksum(const char *);
28: static int layout_append(struct layout_cell *, char *,
29: size_t);
30: static struct layout_cell *layout_construct(struct layout_cell *,
31: const char **);
32: static void layout_assign(struct window_pane **,
33: struct layout_cell *);
1.2 nicm 34:
35: /* Find the bottom-right cell. */
1.9 nicm 36: static struct layout_cell *
1.2 nicm 37: layout_find_bottomright(struct layout_cell *lc)
38: {
39: if (lc->type == LAYOUT_WINDOWPANE)
40: return (lc);
41: lc = TAILQ_LAST(&lc->cells, layout_cells);
42: return (layout_find_bottomright(lc));
43: }
1.1 nicm 44:
45: /* Calculate layout checksum. */
1.9 nicm 46: static u_short
1.1 nicm 47: layout_checksum(const char *layout)
48: {
49: u_short csum;
50:
51: csum = 0;
52: for (; *layout != '\0'; layout++) {
53: csum = (csum >> 1) + ((csum & 1) << 15);
54: csum += *layout;
55: }
56: return (csum);
57: }
58:
59: /* Dump layout as a string. */
60: char *
1.7 nicm 61: layout_dump(struct layout_cell *root)
1.1 nicm 62: {
63: char layout[BUFSIZ], *out;
64:
65: *layout = '\0';
1.7 nicm 66: if (layout_append(root, layout, sizeof layout) != 0)
1.1 nicm 67: return (NULL);
68:
1.9 nicm 69: xasprintf(&out, "%04hx,%s", layout_checksum(layout), layout);
1.1 nicm 70: return (out);
71: }
72:
73: /* Append information for a single cell. */
1.9 nicm 74: static int
1.1 nicm 75: layout_append(struct layout_cell *lc, char *buf, size_t len)
76: {
77: struct layout_cell *lcchild;
78: char tmp[64];
79: size_t tmplen;
80: const char *brackets = "][";
81:
82: if (len == 0)
83: return (-1);
84:
1.3 nicm 85: if (lc->wp != NULL) {
86: tmplen = xsnprintf(tmp, sizeof tmp, "%ux%u,%u,%u,%u",
87: lc->sx, lc->sy, lc->xoff, lc->yoff, lc->wp->id);
88: } else {
89: tmplen = xsnprintf(tmp, sizeof tmp, "%ux%u,%u,%u",
90: lc->sx, lc->sy, lc->xoff, lc->yoff);
91: }
1.1 nicm 92: if (tmplen > (sizeof tmp) - 1)
93: return (-1);
94: if (strlcat(buf, tmp, len) >= len)
95: return (-1);
96:
97: switch (lc->type) {
98: case LAYOUT_LEFTRIGHT:
99: brackets = "}{";
100: /* FALLTHROUGH */
101: case LAYOUT_TOPBOTTOM:
102: if (strlcat(buf, &brackets[1], len) >= len)
103: return (-1);
104: TAILQ_FOREACH(lcchild, &lc->cells, entry) {
105: if (layout_append(lcchild, buf, len) != 0)
106: return (-1);
107: if (strlcat(buf, ",", len) >= len)
108: return (-1);
109: }
110: buf[strlen(buf) - 1] = brackets[0];
111: break;
112: case LAYOUT_WINDOWPANE:
113: break;
114: }
115:
116: return (0);
117: }
118:
119: /* Parse a layout string and arrange window as layout. */
120: int
121: layout_parse(struct window *w, const char *layout)
122: {
123: struct layout_cell *lc, *lcchild;
124: struct window_pane *wp;
1.14 ! nicm 125: u_int npanes, ncells;
1.1 nicm 126: u_short csum;
127:
128: /* Check validity. */
129: if (sscanf(layout, "%hx,", &csum) != 1)
130: return (-1);
131: layout += 5;
132: if (csum != layout_checksum(layout))
133: return (-1);
134:
135: /* Build the layout. */
136: lc = layout_construct(NULL, &layout);
137: if (lc == NULL)
138: return (-1);
139: if (*layout != '\0')
140: goto fail;
141:
142: /* Check this window will fit into the layout. */
143: for (;;) {
144: npanes = window_count_panes(w);
145: ncells = layout_count_cells(lc);
146: if (npanes > ncells)
147: goto fail;
148: if (npanes == ncells)
149: break;
150:
151: /* Fewer panes than cells - close the bottom right. */
152: lcchild = layout_find_bottomright(lc);
1.10 nicm 153: layout_destroy_cell(w, lcchild, &lc);
1.1 nicm 154: }
155:
1.14 ! nicm 156: /* Resize to the layout size. */
1.1 nicm 157: window_resize(w, lc->sx, lc->sy);
158:
159: /* Destroy the old layout and swap to the new. */
160: layout_free_cell(w->layout_root);
161: w->layout_root = lc;
162:
163: /* Assign the panes into the cells. */
164: wp = TAILQ_FIRST(&w->panes);
165: layout_assign(&wp, lc);
166:
167: /* Update pane offsets and sizes. */
168: layout_fix_offsets(lc);
1.12 nicm 169: layout_fix_panes(w);
1.13 nicm 170: recalculate_sizes();
1.1 nicm 171:
172: layout_print_cell(lc, __func__, 0);
1.5 nicm 173:
1.11 nicm 174: notify_window("window-layout-changed", w);
1.1 nicm 175:
176: return (0);
177:
178: fail:
179: layout_free_cell(lc);
180: return (-1);
181: }
182:
183: /* Assign panes into cells. */
1.9 nicm 184: static void
1.1 nicm 185: layout_assign(struct window_pane **wp, struct layout_cell *lc)
186: {
187: struct layout_cell *lcchild;
188:
189: switch (lc->type) {
190: case LAYOUT_WINDOWPANE:
191: layout_make_leaf(lc, *wp);
192: *wp = TAILQ_NEXT(*wp, entry);
193: return;
194: case LAYOUT_LEFTRIGHT:
195: case LAYOUT_TOPBOTTOM:
196: TAILQ_FOREACH(lcchild, &lc->cells, entry)
197: layout_assign(wp, lcchild);
198: return;
199: }
200: }
201:
202: /* Construct a cell from all or part of a layout tree. */
1.9 nicm 203: static struct layout_cell *
1.1 nicm 204: layout_construct(struct layout_cell *lcparent, const char **layout)
205: {
206: struct layout_cell *lc, *lcchild;
207: u_int sx, sy, xoff, yoff;
1.6 nicm 208: const char *saved;
1.1 nicm 209:
210: if (!isdigit((u_char) **layout))
211: return (NULL);
1.6 nicm 212: if (sscanf(*layout, "%ux%u,%u,%u", &sx, &sy, &xoff, &yoff) != 4)
1.1 nicm 213: return (NULL);
214:
215: while (isdigit((u_char) **layout))
216: (*layout)++;
217: if (**layout != 'x')
218: return (NULL);
219: (*layout)++;
220: while (isdigit((u_char) **layout))
221: (*layout)++;
222: if (**layout != ',')
223: return (NULL);
224: (*layout)++;
225: while (isdigit((u_char) **layout))
226: (*layout)++;
227: if (**layout != ',')
228: return (NULL);
229: (*layout)++;
230: while (isdigit((u_char) **layout))
231: (*layout)++;
1.3 nicm 232: if (**layout == ',') {
1.6 nicm 233: saved = *layout;
1.3 nicm 234: (*layout)++;
235: while (isdigit((u_char) **layout))
236: (*layout)++;
1.6 nicm 237: if (**layout == 'x')
238: *layout = saved;
1.3 nicm 239: }
1.1 nicm 240:
241: lc = layout_create_cell(lcparent);
242: lc->sx = sx;
243: lc->sy = sy;
244: lc->xoff = xoff;
245: lc->yoff = yoff;
246:
247: switch (**layout) {
248: case ',':
249: case '}':
250: case ']':
251: case '\0':
252: return (lc);
253: case '{':
254: lc->type = LAYOUT_LEFTRIGHT;
255: break;
256: case '[':
257: lc->type = LAYOUT_TOPBOTTOM;
258: break;
259: default:
260: goto fail;
261: }
262:
263: do {
264: (*layout)++;
265: lcchild = layout_construct(lc, layout);
266: if (lcchild == NULL)
267: goto fail;
268: TAILQ_INSERT_TAIL(&lc->cells, lcchild, entry);
269: } while (**layout == ',');
270:
271: switch (lc->type) {
272: case LAYOUT_LEFTRIGHT:
273: if (**layout != '}')
274: goto fail;
275: break;
276: case LAYOUT_TOPBOTTOM:
277: if (**layout != ']')
278: goto fail;
279: break;
280: default:
281: goto fail;
282: }
283: (*layout)++;
284:
285: return (lc);
286:
287: fail:
288: layout_free_cell(lc);
289: return (NULL);
290: }
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