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Rewrite command queue handling. Each client still has a command queue,
but there is also now a global command queue. Instead of command queues
being dispatched on demand from wherever the command happens to be
added, they are now all dispatched from the top level server
loop. Command queues may now also include callbacks as well as commands,
and items may be inserted after the current command as well as at the end.

This all makes command queues significantly more predictable and easier
to use, and avoids the complex multiple nested command queues used by
source-file, if-shell and friends.

A mass rename of struct cmdq to a better name (cmdq_item probably) is
coming.

/* $OpenBSD: cmd-confirm-before.c,v 1.30 2016/10/16 17:55:14 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 *
 * 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 "tmux.h"

/*
 * Asks for confirmation before executing a command.
 */

static enum cmd_retval	 cmd_confirm_before_exec(struct cmd *, struct cmd_q *);

static int		 cmd_confirm_before_callback(void *, const char *);
static void		 cmd_confirm_before_free(void *);

const struct cmd_entry cmd_confirm_before_entry = {
	.name = "confirm-before",
	.alias = "confirm",

	.args = { "p:t:", 1, 1 },
	.usage = "[-p prompt] " CMD_TARGET_CLIENT_USAGE " command",

	.tflag = CMD_CLIENT,

	.flags = 0,
	.exec = cmd_confirm_before_exec
};

struct cmd_confirm_before_data {
	char		*cmd;
	struct client	*client;
};

static enum cmd_retval
cmd_confirm_before_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args			*args = self->args;
	struct cmd_confirm_before_data	*cdata;
	struct client			*c = cmdq->state.c;
	char				*cmd, *copy, *new_prompt, *ptr;
	const char			*prompt;

	if ((prompt = args_get(args, 'p')) != NULL)
		xasprintf(&new_prompt, "%s ", prompt);
	else {
		ptr = copy = xstrdup(args->argv[0]);
		cmd = strsep(&ptr, " \t");
		xasprintf(&new_prompt, "Confirm '%s'? (y/n) ", cmd);
		free(copy);
	}

	cdata = xmalloc(sizeof *cdata);
	cdata->cmd = xstrdup(args->argv[0]);

	cdata->client = c;
	cdata->client->references++;

	status_prompt_set(c, new_prompt, NULL,
	    cmd_confirm_before_callback, cmd_confirm_before_free, cdata,
	    PROMPT_SINGLE);

	free(new_prompt);
	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_confirm_before_error(struct cmd_q *cmdq, void *data)
{
	char	*error = data;

	cmdq_error(cmdq, "%s", error);
	free(error);

	return (CMD_RETURN_NORMAL);
}

static int
cmd_confirm_before_callback(void *data, const char *s)
{
	struct cmd_confirm_before_data	*cdata = data;
	struct client			*c = cdata->client;
	struct cmd_list			*cmdlist;
	struct cmd_q			*new_cmdq;
	char				*cause;

	if (c->flags & CLIENT_DEAD)
		return (0);

	if (s == NULL || *s == '\0')
		return (0);
	if (tolower((u_char) s[0]) != 'y' || s[1] != '\0')
		return (0);

	if (cmd_string_parse(cdata->cmd, &cmdlist, NULL, 0, &cause) != 0) {
		if (cause != NULL) {
			new_cmdq = cmdq_get_callback(cmd_confirm_before_error,
			    cause);
		} else
			new_cmdq = NULL;
	} else {
		new_cmdq = cmdq_get_command(cmdlist, NULL, NULL, 0);
		cmd_list_free(cmdlist);
	}

	if (new_cmdq != NULL)
		cmdq_append(c, new_cmdq);

	return (0);
}

static void
cmd_confirm_before_free(void *data)
{
	struct cmd_confirm_before_data	*cdata = data;
	struct client			*c = cdata->client;

	server_client_unref(c);

	free(cdata->cmd);
	free(cdata);
}