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Add helpers for the simple case of parse string and add to command queue.

/* $OpenBSD: control.c,v 1.30 2020/04/13 18:59:41 nicm Exp $ */

/*
 * Copyright (c) 2012 Nicholas Marriott <nicholas.marriott@gmail.com>
 * Copyright (c) 2012 George Nachman <tmux@georgester.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 <event.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "tmux.h"

/* Write a line. */
void
control_write(struct client *c, const char *fmt, ...)
{
	va_list	ap;

	va_start(ap, fmt);
	file_vprint(c, fmt, ap);
	file_print(c, "\n");
	va_end(ap);
}

/* Control error callback. */
static enum cmd_retval
control_error(struct cmdq_item *item, void *data)
{
	struct client	*c = cmdq_get_client(item);
	char		*error = data;

	cmdq_guard(item, "begin", 1);
	control_write(c, "parse error: %s", error);
	cmdq_guard(item, "error", 1);

	free(error);
	return (CMD_RETURN_NORMAL);
}

/* Control input callback. Read lines and fire commands. */
static void
control_callback(__unused struct client *c, __unused const char *path,
    int read_error, int closed, struct evbuffer *buffer, __unused void *data)
{
	char			*line, *error;
	struct cmdq_state	*state;
	enum cmd_parse_status	 status;

	if (closed || read_error != 0)
		c->flags |= CLIENT_EXIT;

	for (;;) {
		line = evbuffer_readln(buffer, NULL, EVBUFFER_EOL_LF);
		if (line == NULL)
			break;
		log_debug("%s: %s", __func__, line);
		if (*line == '\0') { /* empty line exit */
			free(line);
			c->flags |= CLIENT_EXIT;
			break;
		}

		state = cmdq_new_state(NULL, NULL, CMDQ_STATE_CONTROL);
		status = cmd_parse_and_append(line, NULL, c, state, &error);
		if (status == CMD_PARSE_ERROR)
			cmdq_append(c, cmdq_get_callback(control_error, error));
		cmdq_free_state(state);

		free(line);
	}
}

void
control_start(struct client *c)
{
	file_read(c, "-", control_callback, c);

	if (c->flags & CLIENT_CONTROLCONTROL)
		file_print(c, "\033P1000p");
}