1: /* $OpenBSD$ */
2:
3: /*
4: * Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
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:
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 *);
34:
35: /* Find the bottom-right cell. */
36: static struct layout_cell *
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: }
44:
45: /* Calculate layout checksum. */
46: static u_short
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 *
61: layout_dump(struct layout_cell *root)
62: {
63: char layout[BUFSIZ], *out;
64:
65: *layout = '\0';
66: if (layout_append(root, layout, sizeof layout) != 0)
67: return (NULL);
68:
69: xasprintf(&out, "%04hx,%s", layout_checksum(layout), layout);
70: return (out);
71: }
72:
73: /* Append information for a single cell. */
74: static int
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:
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: }
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;
125: u_int npanes, ncells, sx, sy;
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);
153: layout_destroy_cell(w, lcchild, &lc);
154: }
155:
156: /* Save the old window size and resize to the layout size. */
157: sx = w->sx; sy = w->sy;
158: window_resize(w, lc->sx, lc->sy);
159:
160: /* Destroy the old layout and swap to the new. */
161: layout_free_cell(w->layout_root);
162: w->layout_root = lc;
163:
164: /* Assign the panes into the cells. */
165: wp = TAILQ_FIRST(&w->panes);
166: layout_assign(&wp, lc);
167:
168: /* Update pane offsets and sizes. */
169: layout_fix_offsets(lc);
170: layout_fix_panes(w, lc->sx, lc->sy);
171:
172: /* Then resize the layout back to the original window size. */
173: layout_resize(w, sx, sy);
174: window_resize(w, sx, sy);
175:
176: layout_print_cell(lc, __func__, 0);
177:
178: notify_window("window-layout-changed", w);
179:
180: return (0);
181:
182: fail:
183: layout_free_cell(lc);
184: return (-1);
185: }
186:
187: /* Assign panes into cells. */
188: static void
189: layout_assign(struct window_pane **wp, struct layout_cell *lc)
190: {
191: struct layout_cell *lcchild;
192:
193: switch (lc->type) {
194: case LAYOUT_WINDOWPANE:
195: layout_make_leaf(lc, *wp);
196: *wp = TAILQ_NEXT(*wp, entry);
197: return;
198: case LAYOUT_LEFTRIGHT:
199: case LAYOUT_TOPBOTTOM:
200: TAILQ_FOREACH(lcchild, &lc->cells, entry)
201: layout_assign(wp, lcchild);
202: return;
203: }
204: }
205:
206: /* Construct a cell from all or part of a layout tree. */
207: static struct layout_cell *
208: layout_construct(struct layout_cell *lcparent, const char **layout)
209: {
210: struct layout_cell *lc, *lcchild;
211: u_int sx, sy, xoff, yoff;
212: const char *saved;
213:
214: if (!isdigit((u_char) **layout))
215: return (NULL);
216: if (sscanf(*layout, "%ux%u,%u,%u", &sx, &sy, &xoff, &yoff) != 4)
217: return (NULL);
218:
219: while (isdigit((u_char) **layout))
220: (*layout)++;
221: if (**layout != 'x')
222: return (NULL);
223: (*layout)++;
224: while (isdigit((u_char) **layout))
225: (*layout)++;
226: if (**layout != ',')
227: return (NULL);
228: (*layout)++;
229: while (isdigit((u_char) **layout))
230: (*layout)++;
231: if (**layout != ',')
232: return (NULL);
233: (*layout)++;
234: while (isdigit((u_char) **layout))
235: (*layout)++;
236: if (**layout == ',') {
237: saved = *layout;
238: (*layout)++;
239: while (isdigit((u_char) **layout))
240: (*layout)++;
241: if (**layout == 'x')
242: *layout = saved;
243: }
244:
245: lc = layout_create_cell(lcparent);
246: lc->sx = sx;
247: lc->sy = sy;
248: lc->xoff = xoff;
249: lc->yoff = yoff;
250:
251: switch (**layout) {
252: case ',':
253: case '}':
254: case ']':
255: case '\0':
256: return (lc);
257: case '{':
258: lc->type = LAYOUT_LEFTRIGHT;
259: break;
260: case '[':
261: lc->type = LAYOUT_TOPBOTTOM;
262: break;
263: default:
264: goto fail;
265: }
266:
267: do {
268: (*layout)++;
269: lcchild = layout_construct(lc, layout);
270: if (lcchild == NULL)
271: goto fail;
272: TAILQ_INSERT_TAIL(&lc->cells, lcchild, entry);
273: } while (**layout == ',');
274:
275: switch (lc->type) {
276: case LAYOUT_LEFTRIGHT:
277: if (**layout != '}')
278: goto fail;
279: break;
280: case LAYOUT_TOPBOTTOM:
281: if (**layout != ']')
282: goto fail;
283: break;
284: default:
285: goto fail;
286: }
287: (*layout)++;
288:
289: return (lc);
290:
291: fail:
292: layout_free_cell(lc);
293: return (NULL);
294: }
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