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/* $OpenBSD: layout-custom.c,v 1.1 2010/06/29 03:30:13 nicm Exp $ */
/*
* Copyright (c) 2010 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include "tmux.h"
u_short layout_checksum(const char *);
int layout_append(struct layout_cell *, char *, size_t);
struct layout_cell *layout_construct(struct layout_cell *, const char **);
void layout_assign(struct window_pane **, struct layout_cell *);
/* Calculate layout checksum. */
u_short
layout_checksum(const char *layout)
{
u_short csum;
csum = 0;
for (; *layout != '\0'; layout++) {
csum = (csum >> 1) + ((csum & 1) << 15);
csum += *layout;
}
return (csum);
}
/* Dump layout as a string. */
char *
layout_dump(struct window *w)
{
char layout[BUFSIZ], *out;
*layout = '\0';
if (layout_append(w->layout_root, layout, sizeof layout) != 0)
return (NULL);
xasprintf(&out, "%4x,%s", layout_checksum(layout), layout);
return (out);
}
/* Append information for a single cell. */
int
layout_append(struct layout_cell *lc, char *buf, size_t len)
{
struct layout_cell *lcchild;
char tmp[64];
size_t tmplen;
const char *brackets = "][";
if (len == 0)
return (-1);
tmplen = xsnprintf(tmp, sizeof tmp,
"%ux%u,%u,%u", lc->sx, lc->sy, lc->xoff, lc->yoff);
if (tmplen > (sizeof tmp) - 1)
return (-1);
if (strlcat(buf, tmp, len) >= len)
return (-1);
switch (lc->type) {
case LAYOUT_LEFTRIGHT:
brackets = "}{";
/* FALLTHROUGH */
case LAYOUT_TOPBOTTOM:
if (strlcat(buf, &brackets[1], len) >= len)
return (-1);
TAILQ_FOREACH(lcchild, &lc->cells, entry) {
if (layout_append(lcchild, buf, len) != 0)
return (-1);
if (strlcat(buf, ",", len) >= len)
return (-1);
}
buf[strlen(buf) - 1] = brackets[0];
break;
case LAYOUT_WINDOWPANE:
break;
}
return (0);
}
/* Parse a layout string and arrange window as layout. */
int
layout_parse(struct window *w, const char *layout)
{
struct layout_cell *lc, *lcchild;
struct window_pane *wp;
u_int npanes, ncells, sx, sy;
u_short csum;
/* Check validity. */
if (sscanf(layout, "%hx,", &csum) != 1)
return (-1);
layout += 5;
if (csum != layout_checksum(layout))
return (-1);
/* Build the layout. */
lc = layout_construct(NULL, &layout);
if (lc == NULL)
return (-1);
if (*layout != '\0')
goto fail;
/* Check this window will fit into the layout. */
for (;;) {
npanes = window_count_panes(w);
ncells = layout_count_cells(lc);
if (npanes > ncells)
goto fail;
if (npanes == ncells)
break;
/* Fewer panes than cells - close the bottom right. */
lcchild = layout_find_bottomright(lc);
layout_destroy_cell(lcchild, &lc);
}
/* Save the old window size and resize to the layout size. */
sx = w->sx; sy = w->sy;
window_resize(w, lc->sx, lc->sy);
/* Destroy the old layout and swap to the new. */
layout_free_cell(w->layout_root);
w->layout_root = lc;
/* Assign the panes into the cells. */
wp = TAILQ_FIRST(&w->panes);
layout_assign(&wp, lc);
/* Update pane offsets and sizes. */
layout_fix_offsets(lc);
layout_fix_panes(w, lc->sx, lc->sy);
/* Then resize the layout back to the original window size. */
layout_resize(w, sx, sy);
window_resize(w, sx, sy);
layout_print_cell(lc, __func__, 0);
return (0);
fail:
layout_free_cell(lc);
return (-1);
}
/* Assign panes into cells. */
void
layout_assign(struct window_pane **wp, struct layout_cell *lc)
{
struct layout_cell *lcchild;
switch (lc->type) {
case LAYOUT_WINDOWPANE:
layout_make_leaf(lc, *wp);
*wp = TAILQ_NEXT(*wp, entry);
return;
case LAYOUT_LEFTRIGHT:
case LAYOUT_TOPBOTTOM:
TAILQ_FOREACH(lcchild, &lc->cells, entry)
layout_assign(wp, lcchild);
return;
}
}
/* Construct a cell from all or part of a layout tree. */
struct layout_cell *
layout_construct(struct layout_cell *lcparent, const char **layout)
{
struct layout_cell *lc, *lcchild;
u_int sx, sy, xoff, yoff;
if (!isdigit((u_char) **layout))
return (NULL);
if (sscanf(*layout, "%ux%u,%u,%u", &sx, &sy, &xoff, &yoff) != 4)
return (NULL);
while (isdigit((u_char) **layout))
(*layout)++;
if (**layout != 'x')
return (NULL);
(*layout)++;
while (isdigit((u_char) **layout))
(*layout)++;
if (**layout != ',')
return (NULL);
(*layout)++;
while (isdigit((u_char) **layout))
(*layout)++;
if (**layout != ',')
return (NULL);
(*layout)++;
while (isdigit((u_char) **layout))
(*layout)++;
lc = layout_create_cell(lcparent);
lc->sx = sx;
lc->sy = sy;
lc->xoff = xoff;
lc->yoff = yoff;
switch (**layout) {
case ',':
case '}':
case ']':
case '\0':
return (lc);
case '{':
lc->type = LAYOUT_LEFTRIGHT;
break;
case '[':
lc->type = LAYOUT_TOPBOTTOM;
break;
default:
goto fail;
}
do {
(*layout)++;
lcchild = layout_construct(lc, layout);
if (lcchild == NULL)
goto fail;
TAILQ_INSERT_TAIL(&lc->cells, lcchild, entry);
} while (**layout == ',');
switch (lc->type) {
case LAYOUT_LEFTRIGHT:
if (**layout != '}')
goto fail;
break;
case LAYOUT_TOPBOTTOM:
if (**layout != ']')
goto fail;
break;
default:
goto fail;
}
(*layout)++;
return (lc);
fail:
layout_free_cell(lc);
return (NULL);
}
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