tmux/layout-custom.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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"
static struct layout_cell *layout_find_bottomright(struct layout_cell *);
static u_short layout_checksum(const char *);
static int layout_append(struct layout_cell *, char *,
size_t);
static struct layout_cell *layout_construct(struct layout_cell *,
const char **);
static void layout_assign(struct window_pane **,
struct layout_cell *);
/* Find the bottom-right cell. */
static struct layout_cell *
layout_find_bottomright(struct layout_cell *lc)
{
if (lc->type == LAYOUT_WINDOWPANE)
return (lc);
lc = TAILQ_LAST(&lc->cells, layout_cells);
return (layout_find_bottomright(lc));
}
/* Calculate layout checksum. */
static 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 layout_cell *root)
{
char layout[8192], *out;
*layout = '\0';
if (layout_append(root, layout, sizeof layout) != 0)
return (NULL);
xasprintf(&out, "%04hx,%s", layout_checksum(layout), layout);
return (out);
}
/* Append information for a single cell. */
static 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);
if (lc->wp != NULL) {
tmplen = xsnprintf(tmp, sizeof tmp, "%ux%u,%u,%u,%u",
lc->sx, lc->sy, lc->xoff, lc->yoff, lc->wp->id);
} else {
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);
}
/* Check layout sizes fit. */
static int
layout_check(struct layout_cell *lc)
{
struct layout_cell *lcchild;
u_int n = 0;
switch (lc->type) {
case LAYOUT_WINDOWPANE:
break;
case LAYOUT_LEFTRIGHT:
TAILQ_FOREACH(lcchild, &lc->cells, entry) {
if (lcchild->sy != lc->sy)
return (0);
if (!layout_check(lcchild))
return (0);
n += lcchild->sx + 1;
}
if (n - 1 != lc->sx)
return (0);
break;
case LAYOUT_TOPBOTTOM:
TAILQ_FOREACH(lcchild, &lc->cells, entry) {
if (lcchild->sx != lc->sx)
return (0);
if (!layout_check(lcchild))
return (0);
n += lcchild->sy + 1;
}
if (n - 1 != lc->sy)
return (0);
break;
}
return (1);
}
/* Parse a layout string and arrange window as layout. */
int
layout_parse(struct window *w, const char *layout, char **cause)
{
struct layout_cell *lc, *lcchild;
struct window_pane *wp;
u_int npanes, ncells, sx = 0, sy = 0;
u_short csum;
/* Check validity. */
if (sscanf(layout, "%hx,", &csum) != 1)
return (-1);
layout += 5;
if (csum != layout_checksum(layout)) {
*cause = xstrdup("invalid layout");
return (-1);
}
/* Build the layout. */
lc = layout_construct(NULL, &layout);
if (lc == NULL) {
*cause = xstrdup("invalid layout");
return (-1);
}
if (*layout != '\0') {
*cause = xstrdup("invalid layout");
goto fail;
}
/* Check this window will fit into the layout. */
for (;;) {
npanes = window_count_panes(w);
ncells = layout_count_cells(lc);
if (npanes > ncells) {
xasprintf(cause, "have %u panes but need %u", npanes,
ncells);
goto fail;
}
if (npanes == ncells)
break;
/* Fewer panes than cells - close the bottom right. */
lcchild = layout_find_bottomright(lc);
layout_destroy_cell(w, lcchild, &lc);
}
/*
* It appears older versions of tmux were able to generate layouts with
* an incorrect top cell size - if it is larger than the top child then
* correct that (if this is still wrong the check code will catch it).
*/
switch (lc->type) {
case LAYOUT_WINDOWPANE:
break;
case LAYOUT_LEFTRIGHT:
TAILQ_FOREACH(lcchild, &lc->cells, entry) {
sy = lcchild->sy + 1;
sx += lcchild->sx + 1;
}
break;
case LAYOUT_TOPBOTTOM:
TAILQ_FOREACH(lcchild, &lc->cells, entry) {
sx = lcchild->sx + 1;
sy += lcchild->sy + 1;
}
break;
}
if (lc->type != LAYOUT_WINDOWPANE && (lc->sx != sx || lc->sy != sy)) {
log_debug("fix layout %u,%u to %u,%u", lc->sx, lc->sy, sx,sy);
layout_print_cell(lc, __func__, 0);
lc->sx = sx - 1; lc->sy = sy - 1;
}
/* Check the new layout. */
if (!layout_check(lc)) {
*cause = xstrdup("size mismatch after applying layout");
return (-1);
}
/* Resize to the layout size. */
window_resize(w, lc->sx, lc->sy, -1, -1);
/* 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(w);
layout_fix_panes(w, NULL);
recalculate_sizes();
layout_print_cell(lc, __func__, 0);
notify_window("window-layout-changed", w);
return (0);
fail:
layout_free_cell(lc);
return (-1);
}
/* Assign panes into cells. */
static 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. */
static struct layout_cell *
layout_construct(struct layout_cell *lcparent, const char **layout)
{
struct layout_cell *lc, *lcchild;
u_int sx, sy, xoff, yoff;
const char *saved;
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)++;
if (**layout == ',') {
saved = *layout;
(*layout)++;
while (isdigit((u_char) **layout))
(*layout)++;
if (**layout == 'x')
*layout = saved;
}
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);
}