mirror of
https://github.com/tmate-io/tmate.git
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292 lines
6.4 KiB
C
292 lines
6.4 KiB
C
/* $Id$ */
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/*
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* Copyright (c) 2010 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <string.h>
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#include "tmux.h"
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struct layout_cell *layout_find_bottomright(struct layout_cell *);
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u_short layout_checksum(const char *);
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int layout_append(struct layout_cell *, char *, size_t);
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struct layout_cell *layout_construct(struct layout_cell *, const char **);
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void layout_assign(struct window_pane **, struct layout_cell *);
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/* Find the bottom-right cell. */
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struct layout_cell *
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layout_find_bottomright(struct layout_cell *lc)
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{
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if (lc->type == LAYOUT_WINDOWPANE)
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return (lc);
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lc = TAILQ_LAST(&lc->cells, layout_cells);
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return (layout_find_bottomright(lc));
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}
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/* Calculate layout checksum. */
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u_short
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layout_checksum(const char *layout)
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{
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u_short csum;
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csum = 0;
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for (; *layout != '\0'; layout++) {
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csum = (csum >> 1) + ((csum & 1) << 15);
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csum += *layout;
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}
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return (csum);
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}
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/* Dump layout as a string. */
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char *
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layout_dump(struct window *w)
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{
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char layout[BUFSIZ], *out;
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*layout = '\0';
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if (layout_append(w->layout_root, layout, sizeof layout) != 0)
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return (NULL);
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xasprintf(&out, "%04x,%s", layout_checksum(layout), layout);
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return (out);
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}
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/* Append information for a single cell. */
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int
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layout_append(struct layout_cell *lc, char *buf, size_t len)
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{
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struct layout_cell *lcchild;
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char tmp[64];
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size_t tmplen;
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const char *brackets = "][";
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if (len == 0)
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return (-1);
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if (lc->wp != NULL) {
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tmplen = xsnprintf(tmp, sizeof tmp, "%ux%u,%u,%u,%u",
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lc->sx, lc->sy, lc->xoff, lc->yoff, lc->wp->id);
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} else {
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tmplen = xsnprintf(tmp, sizeof tmp, "%ux%u,%u,%u",
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lc->sx, lc->sy, lc->xoff, lc->yoff);
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}
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if (tmplen > (sizeof tmp) - 1)
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return (-1);
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if (strlcat(buf, tmp, len) >= len)
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return (-1);
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switch (lc->type) {
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case LAYOUT_LEFTRIGHT:
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brackets = "}{";
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/* FALLTHROUGH */
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case LAYOUT_TOPBOTTOM:
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if (strlcat(buf, &brackets[1], len) >= len)
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return (-1);
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TAILQ_FOREACH(lcchild, &lc->cells, entry) {
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if (layout_append(lcchild, buf, len) != 0)
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return (-1);
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if (strlcat(buf, ",", len) >= len)
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return (-1);
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}
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buf[strlen(buf) - 1] = brackets[0];
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break;
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case LAYOUT_WINDOWPANE:
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break;
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}
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return (0);
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}
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/* Parse a layout string and arrange window as layout. */
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int
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layout_parse(struct window *w, const char *layout)
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{
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struct layout_cell *lc, *lcchild;
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struct window_pane *wp;
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u_int npanes, ncells, sx, sy;
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u_short csum;
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/* Check validity. */
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if (sscanf(layout, "%hx,", &csum) != 1)
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return (-1);
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layout += 5;
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if (csum != layout_checksum(layout))
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return (-1);
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/* Build the layout. */
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lc = layout_construct(NULL, &layout);
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if (lc == NULL)
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return (-1);
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if (*layout != '\0')
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goto fail;
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/* Check this window will fit into the layout. */
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for (;;) {
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npanes = window_count_panes(w);
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ncells = layout_count_cells(lc);
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if (npanes > ncells)
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goto fail;
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if (npanes == ncells)
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break;
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/* Fewer panes than cells - close the bottom right. */
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lcchild = layout_find_bottomright(lc);
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layout_destroy_cell(lcchild, &lc);
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}
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/* Save the old window size and resize to the layout size. */
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sx = w->sx; sy = w->sy;
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window_resize(w, lc->sx, lc->sy);
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/* Destroy the old layout and swap to the new. */
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layout_free_cell(w->layout_root);
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w->layout_root = lc;
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/* Assign the panes into the cells. */
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wp = TAILQ_FIRST(&w->panes);
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layout_assign(&wp, lc);
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/* Update pane offsets and sizes. */
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layout_fix_offsets(lc);
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layout_fix_panes(w, lc->sx, lc->sy);
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/* Then resize the layout back to the original window size. */
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layout_resize(w, sx, sy);
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window_resize(w, sx, sy);
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layout_print_cell(lc, __func__, 0);
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notify_window_layout_changed(w);
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return (0);
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fail:
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layout_free_cell(lc);
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return (-1);
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}
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/* Assign panes into cells. */
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void
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layout_assign(struct window_pane **wp, struct layout_cell *lc)
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{
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struct layout_cell *lcchild;
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switch (lc->type) {
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case LAYOUT_WINDOWPANE:
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layout_make_leaf(lc, *wp);
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*wp = TAILQ_NEXT(*wp, entry);
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return;
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case LAYOUT_LEFTRIGHT:
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case LAYOUT_TOPBOTTOM:
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TAILQ_FOREACH(lcchild, &lc->cells, entry)
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layout_assign(wp, lcchild);
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return;
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}
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}
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/* Construct a cell from all or part of a layout tree. */
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struct layout_cell *
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layout_construct(struct layout_cell *lcparent, const char **layout)
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{
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struct layout_cell *lc, *lcchild;
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u_int sx, sy, xoff, yoff;
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const char *saved;
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if (!isdigit((u_char) **layout))
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return (NULL);
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if (sscanf(*layout, "%ux%u,%u,%u", &sx, &sy, &xoff, &yoff) != 4)
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return (NULL);
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while (isdigit((u_char) **layout))
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(*layout)++;
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if (**layout != 'x')
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return (NULL);
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(*layout)++;
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while (isdigit((u_char) **layout))
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(*layout)++;
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if (**layout != ',')
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return (NULL);
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(*layout)++;
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while (isdigit((u_char) **layout))
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(*layout)++;
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if (**layout != ',')
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return (NULL);
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(*layout)++;
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while (isdigit((u_char) **layout))
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(*layout)++;
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if (**layout == ',') {
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saved = *layout;
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(*layout)++;
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while (isdigit((u_char) **layout))
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(*layout)++;
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if (**layout == 'x')
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*layout = saved;
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}
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lc = layout_create_cell(lcparent);
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lc->sx = sx;
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lc->sy = sy;
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lc->xoff = xoff;
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lc->yoff = yoff;
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switch (**layout) {
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case ',':
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case '}':
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case ']':
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case '\0':
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return (lc);
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case '{':
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lc->type = LAYOUT_LEFTRIGHT;
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break;
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case '[':
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lc->type = LAYOUT_TOPBOTTOM;
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break;
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default:
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goto fail;
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}
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do {
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(*layout)++;
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lcchild = layout_construct(lc, layout);
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if (lcchild == NULL)
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goto fail;
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TAILQ_INSERT_TAIL(&lc->cells, lcchild, entry);
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} while (**layout == ',');
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switch (lc->type) {
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case LAYOUT_LEFTRIGHT:
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if (**layout != '}')
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goto fail;
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break;
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case LAYOUT_TOPBOTTOM:
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if (**layout != ']')
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goto fail;
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break;
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default:
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goto fail;
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}
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(*layout)++;
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return (lc);
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fail:
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layout_free_cell(lc);
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return (NULL);
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}
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