tmux/cmd-queue.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2013 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 <stdlib.h>
#include <string.h>
#include <time.h>
#include "tmux.h"
/* Global command queue. */
static struct cmdq_list global_queue = TAILQ_HEAD_INITIALIZER(global_queue);
/* Get command queue name. */
static const char *
cmdq_name(struct client *c)
{
static char s[256];
if (c == NULL)
return ("<global>");
if (c->name != NULL)
xsnprintf(s, sizeof s, "<%s>", c->name);
else
xsnprintf(s, sizeof s, "<%p>", c);
return (s);
}
/* Get command queue from client. */
static struct cmdq_list *
cmdq_get(struct client *c)
{
if (c == NULL)
return (&global_queue);
return (&c->queue);
}
/* Append an item. */
void
cmdq_append(struct client *c, struct cmdq_item *item)
{
struct cmdq_list *queue = cmdq_get(c);
struct cmdq_item *next;
do {
next = item->next;
item->next = NULL;
if (c != NULL)
c->references++;
item->client = c;
item->queue = queue;
TAILQ_INSERT_TAIL(queue, item, entry);
log_debug("%s %s: %s", __func__, cmdq_name(c), item->name);
item = next;
} while (item != NULL);
}
/* Insert an item. */
void
cmdq_insert_after(struct cmdq_item *after, struct cmdq_item *item)
{
struct client *c = after->client;
struct cmdq_list *queue = after->queue;
struct cmdq_item *next;
do {
next = item->next;
item->next = after->next;
after->next = item;
if (c != NULL)
c->references++;
item->client = c;
item->queue = queue;
TAILQ_INSERT_AFTER(queue, after, item, entry);
log_debug("%s %s: %s after %s", __func__, cmdq_name(c),
item->name, after->name);
after = item;
item = next;
} while (item != NULL);
}
/* Insert a hook. */
void
cmdq_insert_hook(struct session *s, struct cmdq_item *item,
struct cmd_find_state *fs, const char *fmt, ...)
{
struct options *oo;
va_list ap;
char *name;
struct cmdq_item *new_item;
struct options_entry *o;
struct options_array_item *a;
struct cmd_list *cmdlist;
if (item->flags & CMDQ_NOHOOKS)
return;
if (s == NULL)
oo = global_s_options;
else
oo = s->options;
va_start(ap, fmt);
xvasprintf(&name, fmt, ap);
va_end(ap);
o = options_get(oo, name);
if (o == NULL) {
free(name);
return;
}
log_debug("running hook %s (parent %p)", name, item);
a = options_array_first(o);
while (a != NULL) {
cmdlist = options_array_item_value(a)->cmdlist;
if (cmdlist == NULL) {
a = options_array_next(a);
continue;
}
new_item = cmdq_get_command(cmdlist, fs, NULL, CMDQ_NOHOOKS);
cmdq_format(new_item, "hook", "%s", name);
if (item != NULL) {
cmdq_insert_after(item, new_item);
item = new_item;
} else
cmdq_append(NULL, new_item);
a = options_array_next(a);
}
free(name);
}
/* Remove an item. */
static void
cmdq_remove(struct cmdq_item *item)
{
if (item->shared != NULL && --item->shared->references == 0) {
if (item->shared->formats != NULL)
format_free(item->shared->formats);
free(item->shared);
}
if (item->client != NULL)
server_client_unref(item->client);
if (item->cmdlist != NULL)
cmd_list_free(item->cmdlist);
TAILQ_REMOVE(item->queue, item, entry);
free(item->name);
free(item);
}
/* Remove all subsequent items that match this item's group. */
static void
cmdq_remove_group(struct cmdq_item *item)
{
struct cmdq_item *this, *next;
if (item->group == 0)
return;
this = TAILQ_NEXT(item, entry);
while (this != NULL) {
next = TAILQ_NEXT(this, entry);
if (this->group == item->group)
cmdq_remove(this);
this = next;
}
}
/* Get a command for the command queue. */
struct cmdq_item *
cmdq_get_command(struct cmd_list *cmdlist, struct cmd_find_state *current,
struct mouse_event *m, int flags)
{
struct cmdq_item *item, *first = NULL, *last = NULL;
struct cmd *cmd;
struct cmdq_shared *shared;
shared = xcalloc(1, sizeof *shared);
if (current != NULL)
cmd_find_copy_state(&shared->current, current);
else
cmd_find_clear_state(&shared->current, 0);
if (m != NULL)
memcpy(&shared->mouse, m, sizeof shared->mouse);
TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
item = xcalloc(1, sizeof *item);
xasprintf(&item->name, "[%s/%p]", cmd->entry->name, item);
item->type = CMDQ_COMMAND;
item->group = cmd->group;
item->flags = flags;
item->shared = shared;
item->cmdlist = cmdlist;
item->cmd = cmd;
log_debug("%s: %s group %u", __func__, item->name, item->group);
shared->references++;
cmdlist->references++;
if (first == NULL)
first = item;
if (last != NULL)
last->next = item;
last = item;
}
return (first);
}
/* Fill in flag for a command. */
static enum cmd_retval
cmdq_find_flag(struct cmdq_item *item, struct cmd_find_state *fs,
const struct cmd_entry_flag *flag)
{
const char *value;
if (flag->flag == 0) {
cmd_find_clear_state(fs, 0);
return (CMD_RETURN_NORMAL);
}
value = args_get(item->cmd->args, flag->flag);
if (cmd_find_target(fs, item, value, flag->type, flag->flags) != 0) {
cmd_find_clear_state(fs, 0);
return (CMD_RETURN_ERROR);
}
return (CMD_RETURN_NORMAL);
}
/* Fire command on command queue. */
static enum cmd_retval
cmdq_fire_command(struct cmdq_item *item)
{
struct client *c = item->client;
struct cmdq_shared *shared = item->shared;
struct cmd *cmd = item->cmd;
const struct cmd_entry *entry = cmd->entry;
enum cmd_retval retval;
struct cmd_find_state *fsp, fs;
int flags;
flags = !!(shared->flags & CMDQ_SHARED_CONTROL);
cmdq_guard(item, "begin", flags);
if (item->client == NULL)
item->client = cmd_find_client(item, NULL, 1);
retval = cmdq_find_flag(item, &item->source, &entry->source);
if (retval == CMD_RETURN_ERROR)
goto out;
retval = cmdq_find_flag(item, &item->target, &entry->target);
if (retval == CMD_RETURN_ERROR)
goto out;
retval = entry->exec(cmd, item);
if (retval == CMD_RETURN_ERROR)
goto out;
if (entry->flags & CMD_AFTERHOOK) {
if (cmd_find_valid_state(&item->target))
fsp = &item->target;
else if (cmd_find_valid_state(&item->shared->current))
fsp = &item->shared->current;
else if (cmd_find_from_client(&fs, item->client, 0) == 0)
fsp = &fs;
else
goto out;
cmdq_insert_hook(fsp->s, item, fsp, "after-%s", entry->name);
}
out:
item->client = c;
if (retval == CMD_RETURN_ERROR)
cmdq_guard(item, "error", flags);
else
cmdq_guard(item, "end", flags);
return (retval);
}
/* Get a callback for the command queue. */
struct cmdq_item *
cmdq_get_callback1(const char *name, cmdq_cb cb, void *data)
{
struct cmdq_item *item;
item = xcalloc(1, sizeof *item);
xasprintf(&item->name, "[%s/%p]", name, item);
item->type = CMDQ_CALLBACK;
item->group = 0;
item->flags = 0;
item->cb = cb;
item->data = data;
return (item);
}
/* Generic error callback. */
static enum cmd_retval
cmdq_error_callback(struct cmdq_item *item, void *data)
{
char *error = data;
cmdq_error(item, "%s", error);
free(error);
return (CMD_RETURN_NORMAL);
}
/* Get an error callback for the command queue. */
struct cmdq_item *
cmdq_get_error(const char *error)
{
return (cmdq_get_callback(cmdq_error_callback, xstrdup(error)));
}
/* Fire callback on callback queue. */
static enum cmd_retval
cmdq_fire_callback(struct cmdq_item *item)
{
return (item->cb(item, item->data));
}
/* Add a format to command queue. */
void
cmdq_format(struct cmdq_item *item, const char *key, const char *fmt, ...)
{
struct cmdq_shared *shared = item->shared;
va_list ap;
char *value;
va_start(ap, fmt);
xvasprintf(&value, fmt, ap);
va_end(ap);
if (shared->formats == NULL)
shared->formats = format_create(NULL, NULL, FORMAT_NONE, 0);
format_add(shared->formats, key, "%s", value);
free(value);
}
/* Process next item on command queue. */
u_int
cmdq_next(struct client *c)
{
struct cmdq_list *queue = cmdq_get(c);
const char *name = cmdq_name(c);
struct cmdq_item *item;
enum cmd_retval retval;
u_int items = 0;
static u_int number;
if (TAILQ_EMPTY(queue)) {
log_debug("%s %s: empty", __func__, name);
return (0);
}
if (TAILQ_FIRST(queue)->flags & CMDQ_WAITING) {
log_debug("%s %s: waiting", __func__, name);
return (0);
}
log_debug("%s %s: enter", __func__, name);
for (;;) {
item = TAILQ_FIRST(queue);
if (item == NULL)
break;
log_debug("%s %s: %s (%d), flags %x", __func__, name,
item->name, item->type, item->flags);
/*
* Any item with the waiting flag set waits until an external
* event clears the flag (for example, a job - look at
* run-shell).
*/
if (item->flags & CMDQ_WAITING)
goto waiting;
/*
* Items are only fired once, once the fired flag is set, a
* waiting flag can only be cleared by an external event.
*/
if (~item->flags & CMDQ_FIRED) {
item->time = time(NULL);
item->number = ++number;
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switch (item->type) {
case CMDQ_COMMAND:
retval = cmdq_fire_command(item);
/*
* If a command returns an error, remove any
* subsequent commands in the same group.
*/
if (retval == CMD_RETURN_ERROR)
cmdq_remove_group(item);
break;
case CMDQ_CALLBACK:
retval = cmdq_fire_callback(item);
break;
default:
retval = CMD_RETURN_ERROR;
break;
}
item->flags |= CMDQ_FIRED;
if (retval == CMD_RETURN_WAIT) {
item->flags |= CMDQ_WAITING;
goto waiting;
}
items++;
}
cmdq_remove(item);
}
log_debug("%s %s: exit (empty)", __func__, name);
return (items);
waiting:
log_debug("%s %s: exit (wait)", __func__, name);
return (items);
}
/* Print a guard line. */
void
cmdq_guard(struct cmdq_item *item, const char *guard, int flags)
{
struct client *c = item->client;
if (c == NULL || !(c->flags & CLIENT_CONTROL))
return;
evbuffer_add_printf(c->stdout_data, "%%%s %ld %u %d\n", guard,
(long)item->time, item->number, flags);
server_client_push_stdout(c);
}
/* Show message from command. */
void
cmdq_print(struct cmdq_item *item, const char *fmt, ...)
{
struct client *c = item->client;
struct window_pane *wp;
struct window_mode_entry *wme;
va_list ap;
char *tmp, *msg;
va_start(ap, fmt);
if (c == NULL)
/* nothing */;
else if (c->session == NULL || (c->flags & CLIENT_CONTROL)) {
if (~c->flags & CLIENT_UTF8) {
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xvasprintf(&tmp, fmt, ap);
msg = utf8_sanitize(tmp);
free(tmp);
evbuffer_add(c->stdout_data, msg, strlen(msg));
free(msg);
} else
evbuffer_add_vprintf(c->stdout_data, fmt, ap);
evbuffer_add(c->stdout_data, "\n", 1);
server_client_push_stdout(c);
} else {
wp = c->session->curw->window->active;
wme = TAILQ_FIRST(&wp->modes);
if (wme == NULL || wme->mode != &window_view_mode)
window_pane_set_mode(wp, &window_view_mode, NULL, NULL);
window_copy_vadd(wp, fmt, ap);
}
va_end(ap);
}
/* Show error from command. */
void
cmdq_error(struct cmdq_item *item, const char *fmt, ...)
{
struct client *c = item->client;
struct cmd *cmd = item->cmd;
va_list ap;
char *msg;
size_t msglen;
char *tmp;
va_start(ap, fmt);
msglen = xvasprintf(&msg, fmt, ap);
va_end(ap);
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log_debug("%s: %s", __func__, msg);
if (c == NULL)
cfg_add_cause("%s:%u: %s", cmd->file, cmd->line, msg);
else if (c->session == NULL || (c->flags & CLIENT_CONTROL)) {
if (~c->flags & CLIENT_UTF8) {
tmp = msg;
msg = utf8_sanitize(tmp);
free(tmp);
msglen = strlen(msg);
}
evbuffer_add(c->stderr_data, msg, msglen);
evbuffer_add(c->stderr_data, "\n", 1);
server_client_push_stderr(c);
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c->retval = 1;
} else {
*msg = toupper((u_char) *msg);
status_message_set(c, "%s", msg);
}
free(msg);
}