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tmux/window.c

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/* $Id: window.c,v 1.60 2009-01-20 19:35:03 nicm Exp $ */
/*
* Copyright (c) 2007 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 <sys/ioctl.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#ifndef NO_PATHS_H
#include <paths.h>
#endif
#ifdef USE_LIBUTIL_H
#include <libutil.h>
#else
#ifdef USE_PTY_H
#include <pty.h>
#else
#ifndef NO_FORKPTY
#include <util.h>
#endif
#endif
#endif
#include "tmux.h"
/*
* Each window is attached to one or two panes, each of which is a pty. This
* file contains code to handle them.
*
* A pane has two buffers attached, these are filled and emptied by the main
* server poll loop. Output data is received from pty's in screen format,
* translated and returned as a series of escape sequences and strings via
* input_parse (in input.c). Input data is received as key codes and written
* directly via input_key.
*
* Each pane also has a "virtual" screen (screen.c) which contains the current
* state and is redisplayed when the window is reattached to a client.
*
* Windows are stored directly on a global array and wrapped in any number of
* winlink structs to be linked onto local session RB trees. A reference count
* is maintained and a window removed from the global list and destroyed when
* it reaches zero.
*/
/* Global window list. */
struct windows windows;
RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
int
winlink_cmp(struct winlink *wl1, struct winlink *wl2)
{
return (wl1->idx - wl2->idx);
}
struct winlink *
winlink_find_by_index(struct winlinks *wwl, int idx)
{
struct winlink wl;
if (idx < 0)
fatalx("bad index");
wl.idx = idx;
return (RB_FIND(winlinks, wwl, &wl));
}
int
winlink_next_index(struct winlinks *wwl)
{
u_int i;
for (i = 0; i < INT_MAX; i++) {
if (winlink_find_by_index(wwl, i) == NULL)
return (i);
}
fatalx("no free indexes");
}
u_int
winlink_count(struct winlinks *wwl)
{
struct winlink *wl;
u_int n;
n = 0;
RB_FOREACH(wl, winlinks, wwl)
n++;
return (n);
}
struct winlink *
winlink_add(struct winlinks *wwl, struct window *w, int idx)
{
struct winlink *wl;
if (idx == -1)
idx = winlink_next_index(wwl);
else if (winlink_find_by_index(wwl, idx) != NULL)
return (NULL);
if (idx < 0)
fatalx("bad index");
wl = xcalloc(1, sizeof *wl);
wl->idx = idx;
wl->window = w;
RB_INSERT(winlinks, wwl, wl);
w->references++;
return (wl);
}
void
winlink_remove(struct winlinks *wwl, struct winlink *wl)
{
struct window *w = wl->window;
RB_REMOVE(winlinks, wwl, wl);
xfree(wl);
if (w->references == 0)
fatal("bad reference count");
w->references--;
if (w->references == 0)
window_destroy(w);
}
struct winlink *
winlink_next(unused struct winlinks *wwl, struct winlink *wl)
{
return (RB_NEXT(winlinks, wwl, wl));
}
struct winlink *
winlink_previous(unused struct winlinks *wwl, struct winlink *wl)
{
return (RB_PREV(winlinks, wwl, wl));
}
void
winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
{
if (wl == NULL)
return;
winlink_stack_remove(stack, wl);
SLIST_INSERT_HEAD(stack, wl, sentry);
}
void
winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
{
struct winlink *wl2;
if (wl == NULL)
return;
SLIST_FOREACH(wl2, stack, sentry) {
if (wl2 == wl) {
SLIST_REMOVE(stack, wl, winlink, sentry);
return;
}
}
}
int
window_index(struct window *s, u_int *i)
{
for (*i = 0; *i < ARRAY_LENGTH(&windows); (*i)++) {
if (s == ARRAY_ITEM(&windows, *i))
return (0);
}
return (-1);
}
struct window *
window_create(const char *name, const char *cmd,
const char *cwd, const char **envp, u_int sx, u_int sy, u_int hlimit)
{
struct window *w;
u_int i;
w = xmalloc(sizeof *w);
w->flags = 0;
TAILQ_INIT(&w->panes);
w->active = NULL;
w->pgrp = -1;
w->sx = sx;
w->sy = sy;
options_init(&w->options, &global_window_options);
for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
if (ARRAY_ITEM(&windows, i) == NULL) {
ARRAY_SET(&windows, i, w);
break;
}
}
if (i == ARRAY_LENGTH(&windows))
ARRAY_ADD(&windows, w);
w->references = 0;
if (window_add_pane(w, cmd, cwd, envp, hlimit) == NULL) {
window_destroy(w);
return (NULL);
}
w->active = TAILQ_FIRST(&w->panes);
if (name != NULL) {
w->name = xstrdup(name);
options_set_number(&w->options, "automatic-rename", 0);
} else
w->name = default_window_name(w);
return (w);
}
void
window_destroy(struct window *w)
{
u_int i;
if (window_index(w, &i) != 0)
fatalx("index not found");
ARRAY_SET(&windows, i, NULL);
while (!ARRAY_EMPTY(&windows) && ARRAY_LAST(&windows) == NULL)
ARRAY_TRUNC(&windows, 1);
options_free(&w->options);
window_destroy_panes(w);
xfree(w->name);
xfree(w);
}
int
window_resize(struct window *w, u_int sx, u_int sy)
{
w->sx = sx;
w->sy = sy;
window_fit_panes(w);
return (0);
}
void
window_fit_panes(struct window *w)
{
struct window_pane *wp;
u_int npanes, canfit, total;
int left;
if (TAILQ_EMPTY(&w->panes))
return;
/* Clear hidden flags. */
TAILQ_FOREACH(wp, &w->panes, entry)
wp->flags &= ~PANE_HIDDEN;
/* Check the new size. */
npanes = window_count_panes(w);
if (w->sy <= PANE_MINIMUM * npanes) {
/* How many can we fit? */
canfit = w->sy / PANE_MINIMUM;
if (canfit == 0) {
/* None. Just use this size for the first. */
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp == TAILQ_FIRST(&w->panes))
wp->sy = w->sy;
else
wp->flags |= PANE_HIDDEN;
}
} else {
/* >=1, set minimum for them all. */
TAILQ_FOREACH(wp, &w->panes, entry) {
if (canfit-- > 0)
wp->sy = PANE_MINIMUM - 1;
else
wp->flags |= PANE_HIDDEN;
}
/* And increase the first by the rest. */
TAILQ_FIRST(&w->panes)->sy += 1 + w->sy % PANE_MINIMUM;
}
} else {
/* In theory they will all fit. Find the current total. */
total = 0;
TAILQ_FOREACH(wp, &w->panes, entry)
total += wp->sy;
total += npanes - 1;
/* Growing or shrinking? */
left = w->sy - total;
if (left > 0) {
/* Growing. Expand evenly. */
while (left > 0) {
TAILQ_FOREACH(wp, &w->panes, entry) {
wp->sy++;
if (--left == 0)
break;
}
}
} else {
/* Shrinking. Reduce evenly down to minimum. */
while (left < 0) {
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp->sy <= PANE_MINIMUM - 1)
continue;
wp->sy--;
if (++left == 0)
break;
}
}
}
}
/* Now do the resize. */
TAILQ_FOREACH(wp, &w->panes, entry) {
wp->sy--;
window_pane_resize(wp, w->sx, wp->sy + 1);
}
/* Fill in the offsets. */
window_update_panes(w);
/* Switch the active window if necessary. */
window_set_active_pane(w, w->active);
}
void
window_update_panes(struct window *w)
{
struct window_pane *wp;
u_int yoff;
yoff = 0;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp->flags & PANE_HIDDEN)
continue;
wp->yoff = yoff;
yoff += wp->sy + 1;
}
}
void
window_set_active_pane(struct window *w, struct window_pane *wp)
{
w->active = wp;
while (w->active->flags & PANE_HIDDEN)
w->active = TAILQ_PREV(w->active, window_panes, entry);
}
struct window_pane *
window_add_pane(struct window *w,
const char *cmd, const char *cwd, const char **envp, u_int hlimit)
{
struct window_pane *wp;
u_int wanty;
if (TAILQ_EMPTY(&w->panes))
wanty = w->sy;
else {
if (w->active->sy < PANE_MINIMUM * 2)
return (NULL);
wanty = (w->active->sy / 2 + w->active->sy % 2) - 1;
window_pane_resize(w->active, w->sx, w->active->sy / 2);
}
wp = window_pane_create(w, w->sx, wanty, hlimit);
if (TAILQ_EMPTY(&w->panes))
TAILQ_INSERT_HEAD(&w->panes, wp, entry);
else
TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
window_update_panes(w);
if (window_pane_spawn(wp, cmd, cwd, envp) != 0) {
window_remove_pane(w, wp);
return (NULL);
}
return (wp);
}
void
window_remove_pane(struct window *w, struct window_pane *wp)
{
w->active = TAILQ_PREV(wp, window_panes, entry);
if (w->active == NULL)
w->active = TAILQ_NEXT(wp, entry);
TAILQ_REMOVE(&w->panes, wp, entry);
window_pane_destroy(wp);
window_fit_panes(w);
}
u_int
window_index_of_pane(struct window *w, struct window_pane *find)
{
struct window_pane *wp;
u_int n;
n = 0;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (wp == find)
return (n);
n++;
}
fatalx("unknown pane");
}
struct window_pane *
window_pane_at_index(struct window *w, u_int idx)
{
struct window_pane *wp;
u_int n;
n = 0;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (n == idx)
return (wp);
n++;
}
return (NULL);
}
u_int
window_count_panes(struct window *w)
{
struct window_pane *wp;
u_int n;
n = 0;
TAILQ_FOREACH(wp, &w->panes, entry)
n++;
return (n);
}
void
window_destroy_panes(struct window *w)
{
struct window_pane *wp;
while (!TAILQ_EMPTY(&w->panes)) {
wp = TAILQ_FIRST(&w->panes);
TAILQ_REMOVE(&w->panes, wp, entry);
window_pane_destroy(wp);
}
}
struct window_pane *
window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
{
struct window_pane *wp;
wp = xcalloc(1, sizeof *wp);
wp->window = w;
wp->cmd = NULL;
wp->cwd = NULL;
wp->fd = -1;
wp->in = buffer_create(BUFSIZ);
wp->out = buffer_create(BUFSIZ);
wp->mode = NULL;
wp->sx = sx;
wp->sy = sy;
wp->yoff = 0;
screen_init(&wp->base, sx, sy, hlimit);
wp->screen = &wp->base;
input_init(wp);
return (wp);
}
void
window_pane_destroy(struct window_pane *wp)
{
if (wp->fd != -1)
close(wp->fd);
input_free(wp);
window_pane_reset_mode(wp);
screen_free(&wp->base);
buffer_destroy(wp->in);
buffer_destroy(wp->out);
if (wp->cwd != NULL)
xfree(wp->cwd);
if (wp->cmd != NULL)
xfree(wp->cmd);
xfree(wp);
}
int
window_pane_spawn(struct window_pane *wp,
const char *cmd, const char *cwd, const char **envp)
{
struct winsize ws;
int mode;
const char **envq;
struct timeval tv;
if (wp->fd != -1)
close(wp->fd);
if (cmd != NULL) {
if (wp->cmd != NULL)
xfree(wp->cmd);
wp->cmd = xstrdup(cmd);
}
if (cwd != NULL) {
if (wp->cwd != NULL)
xfree(wp->cwd);
wp->cwd = xstrdup(cwd);
}
memset(&ws, 0, sizeof ws);
ws.ws_col = screen_size_x(&wp->base);
ws.ws_row = screen_size_y(&wp->base);
wp->window->pgrp = -1;
if (gettimeofday(&wp->window->name_timer, NULL) != 0)
fatal("gettimeofday");
tv.tv_sec = 0;
tv.tv_usec = NAME_INTERVAL * 1000L;
timeradd(&wp->window->name_timer, &tv, &wp->window->name_timer);
switch (forkpty(&wp->fd, NULL, NULL, &ws)) {
case -1:
return (1);
case 0:
if (chdir(wp->cwd) != 0)
chdir("/");
for (envq = envp; *envq != NULL; envq++) {
if (putenv(*envq) != 0)
fatal("putenv failed");
}
sigreset();
log_close();
execl(_PATH_BSHELL, "sh", "-c", wp->cmd, (char *) NULL);
fatal("execl failed");
}
if ((mode = fcntl(wp->fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(wp->fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
if (fcntl(wp->fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
return (0);
}
int
window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
{
struct winsize ws;
if (sx == wp->sx && sy == wp->sy)
return (-1);
wp->sx = sx;
wp->sy = sy;
memset(&ws, 0, sizeof ws);
ws.ws_col = sx;
ws.ws_row = sy;
screen_resize(&wp->base, sx, sy);
if (wp->mode != NULL)
wp->mode->resize(wp, sx, sy);
if (wp->fd != -1 && ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
fatal("ioctl failed");
return (0);
}
int
window_pane_set_mode(struct window_pane *wp, const struct window_mode *mode)
{
struct screen *s;
if (wp->mode != NULL || wp->mode == mode)
return (1);
wp->mode = mode;
if ((s = wp->mode->init(wp)) != NULL)
wp->screen = s;
server_redraw_window(wp->window);
return (0);
}
void
window_pane_reset_mode(struct window_pane *wp)
{
if (wp->mode == NULL)
return;
wp->mode->free(wp);
wp->mode = NULL;
wp->screen = &wp->base;
server_redraw_window(wp->window);
}
void
window_pane_parse(struct window_pane *wp)
{
input_parse(wp);
}
void
window_pane_key(struct window_pane *wp, struct client *c, int key)
{
if (wp->mode != NULL)
wp->mode->key(wp, c, key);
else
input_key(wp, key);
}
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