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Add a window or pane id "tag" to each format tree and use it to separate
jobs, this means that if the same job is used for different windows or
panes (for example in pane-border-format), it will be run separately for
each pane.

/* $OpenBSD: cmd-queue.c,v 1.48 2017/02/03 11:57:27 nicm Exp $ */

/*
 * 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[32];

	if (c == NULL)
		return ("<global>");
	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);

		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 = NULL;

		if (c != NULL)
			c->references++;
		item->client = c;

		item->queue = queue;
		if (after->next != NULL)
			TAILQ_INSERT_AFTER(queue, after->next, item, entry);
		else
			TAILQ_INSERT_AFTER(queue, after, item, entry);
		after->next = item;

		item = next;
	} while (item != NULL);
}

/* Remove an item. */
static void
cmdq_remove(struct cmdq_item *item)
{
	if (item->formats != NULL)
		format_free(item->formats);

	if (item->client != NULL)
		server_client_unref(item->client);

	if (item->type == CMDQ_COMMAND)
		cmd_list_free(item->cmdlist);

	TAILQ_REMOVE(item->queue, item, entry);

	free((void *)item->name);
	free(item);
}

/* Set command group. */
static u_int
cmdq_next_group(void)
{
	static u_int	group;

	return (++group);
}

/* Remove all subsequent items that match this item's group. */
static void
cmdq_remove_group(struct cmdq_item *item)
{
	struct cmdq_item	*this, *next;

	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;
	u_int			 group = cmdq_next_group();
	char			*tmp;

	TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
		xasprintf(&tmp, "command[%s]", cmd->entry->name);

		item = xcalloc(1, sizeof *item);
		item->name = tmp;
		item->type = CMDQ_COMMAND;

		item->group = group;
		item->flags = flags;

		item->cmdlist = cmdlist;
		item->cmd = cmd;

		if (current != NULL)
			cmd_find_copy_state(&item->current, current);
		if (m != NULL)
			memcpy(&item->mouse, m, sizeof item->mouse);
		cmdlist->references++;

		if (first == NULL)
			first = item;
		if (last != NULL)
			last->next = item;
		last = item;
	}
	return (first);
}

/* Fire command on command queue. */
static enum cmd_retval
cmdq_fire_command(struct cmdq_item *item)
{
	struct client		*c = item->client;
	struct cmd		*cmd = item->cmd;
	enum cmd_retval		 retval;
	const char		*name;
	struct cmd_find_state	*fsp, fs;
	int			 flags;

	flags = !!(cmd->flags & CMD_CONTROL);
	cmdq_guard(item, "begin", flags);

	if (cmd_prepare_state(cmd, item) != 0) {
		retval = CMD_RETURN_ERROR;
		goto out;
	}
	if (item->client == NULL)
		item->client = cmd_find_client(item, NULL, CMD_FIND_QUIET);

	retval = cmd->entry->exec(cmd, item);
	if (retval == CMD_RETURN_ERROR)
		goto out;

	if (cmd->entry->flags & CMD_AFTERHOOK) {
		name = cmd->entry->name;
		if (cmd_find_valid_state(&item->state.tflag))
			fsp = &item->state.tflag;
		else {
			if (cmd_find_current(&fs, item, CMD_FIND_QUIET) != 0)
				goto out;
			fsp = &fs;
		}
		hooks_insert(fsp->s->hooks, item, fsp, "after-%s", 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;
	char			*tmp;

	xasprintf(&tmp, "callback[%s]", name);

	item = xcalloc(1, sizeof *item);
	item->name = tmp;
	item->type = CMDQ_CALLBACK;

	item->group = 0;
	item->flags = 0;

	item->cb = cb;
	item->data = data;

	return (item);
}

/* 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, ...)
{
	va_list			 ap;
	struct cmdq_item	*loop;
	char			*value;

	va_start(ap, fmt);
	xvasprintf(&value, fmt, ap);
	va_end(ap);

	for (loop = item; loop != NULL; loop = item->next) {
		if (loop->formats == NULL)
			loop->formats = format_create(NULL, FORMAT_NONE, 0);
		format_add(loop->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;

			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	*w;
	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) {
			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 {
		w = c->session->curw->window;
		if (w->active->mode != &window_copy_mode) {
			window_pane_reset_mode(w->active);
			window_pane_set_mode(w->active, &window_copy_mode);
			window_copy_init_for_output(w->active);
		}
		window_copy_vadd(w->active, 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);

	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);
		c->retval = 1;
	} else {
		*msg = toupper((u_char) *msg);
		status_message_set(c, "%s", msg);
	}

	free(msg);
}