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Add a skeleton mode to tmux (called "control mode") that let's tmux
commands be sent and output received on stdout. This can be used to
integrate with other terminal emulators and should allow some other
things to be made simpler later. More to come so doesn't do much yet and
deliberately not documented.

/* $OpenBSD: control.c,v 1.1 2012/06/18 13:16:42 nicm Exp $ */

/*
 * Copyright (c) 2012 Nicholas Marriott <nicm@users.sourceforge.net>
 * 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 <string.h>

#include "tmux.h"

void printflike2 control_msg_error(struct cmd_ctx *, const char *, ...);
void printflike2 control_msg_print(struct cmd_ctx *, const char *, ...);
void printflike2 control_msg_info(struct cmd_ctx *, const char *, ...);
void printflike2 control_write(struct client *, const char *, ...);

/* Command error callback. */
void printflike2
control_msg_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
	struct client	*c = ctx->curclient;
	va_list		 ap;

	va_start(ap, fmt);
	evbuffer_add_vprintf(c->stdout_data, fmt, ap);
	va_end(ap);

	evbuffer_add(c->stdout_data, "\n", 1);
	server_push_stdout(c);
}

/* Command print callback. */
void printflike2
control_msg_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
	struct client	*c = ctx->curclient;
	va_list		 ap;

	va_start(ap, fmt);
	evbuffer_add_vprintf(c->stdout_data, fmt, ap);
	va_end(ap);

	evbuffer_add(c->stdout_data, "\n", 1);
	server_push_stdout(c);
}

/* Command info callback. */
void printflike2
control_msg_info(unused struct cmd_ctx *ctx, unused const char *fmt, ...)
{
}

/* Write a line. */
void printflike2
control_write(struct client *c, const char *fmt, ...)
{
	va_list		 ap;

	va_start(ap, fmt);
	evbuffer_add_vprintf(c->stdout_data, fmt, ap);
	va_end(ap);

	evbuffer_add(c->stdout_data, "\n", 1);
	server_push_stdout(c);
}

/* Control input callback. Read lines and fire commands. */
void
control_callback(struct client *c, int closed, unused void *data)
{
	char		*line, *cause;
	struct cmd_ctx	 ctx;
	struct cmd_list	*cmdlist;

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

	for (;;) {
		line = evbuffer_readln(c->stdin_data, NULL, EVBUFFER_EOL_LF);
		if (line == NULL)
			break;
		if (*line == '\0') { /* empty line exit */
			c->flags |= CLIENT_EXIT;
			break;
		}

		ctx.msgdata = NULL;
		ctx.cmdclient = NULL;
		ctx.curclient = c;

		ctx.error = control_msg_error;
		ctx.print = control_msg_print;
		ctx.info = control_msg_info;

		if (cmd_string_parse(line, &cmdlist, &cause) != 0) {
			control_write(c, "%%error in line \"%s\": %s", line,
			    cause);
			xfree(cause);
		} else {
			cmd_list_exec(cmdlist, &ctx);
			cmd_list_free(cmdlist);
		}

		xfree(line);
	}
}