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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: cmd-list.c,v 1.7 2012/06/18 13:16:42 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 <string.h>

#include "tmux.h"

struct cmd_list *
cmd_list_parse(int argc, char **argv, char **cause)
{
	struct cmd_list	*cmdlist;
	struct cmd	*cmd;
	int		 i, lastsplit;
	size_t		 arglen, new_argc;
	char	       **copy_argv, **new_argv;

	copy_argv = cmd_copy_argv(argc, argv);

	cmdlist = xmalloc(sizeof *cmdlist);
	cmdlist->references = 1;
	TAILQ_INIT(&cmdlist->list);

	lastsplit = 0;
	for (i = 0; i < argc; i++) {
		arglen = strlen(copy_argv[i]);
		if (arglen == 0 || copy_argv[i][arglen - 1] != ';')
			continue;
		copy_argv[i][arglen - 1] = '\0';

		if (arglen > 1 && copy_argv[i][arglen - 2] == '\\') {
			copy_argv[i][arglen - 2] = ';';
			continue;
		}

		new_argc = i - lastsplit;
		new_argv = copy_argv + lastsplit;
		if (arglen != 1)
			new_argc++;

		cmd = cmd_parse(new_argc, new_argv, cause);
		if (cmd == NULL)
			goto bad;
		TAILQ_INSERT_TAIL(&cmdlist->list, cmd, qentry);

		lastsplit = i + 1;
	}

	if (lastsplit != argc) {
		cmd = cmd_parse(argc - lastsplit, copy_argv + lastsplit, cause);
		if (cmd == NULL)
			goto bad;
		TAILQ_INSERT_TAIL(&cmdlist->list, cmd, qentry);
	}

	cmd_free_argv(argc, copy_argv);
	return (cmdlist);

bad:
	cmd_list_free(cmdlist);
	cmd_free_argv(argc, copy_argv);
	return (NULL);
}

int
cmd_list_exec(struct cmd_list *cmdlist, struct cmd_ctx *ctx)
{
	struct client	*c = ctx->curclient;
	struct cmd	*cmd;
	int		 n, retval, guards;

	guards = 0;
	if (c != NULL && c->session != NULL)
		guards = c->flags & CLIENT_CONTROL;

	retval = 0;
	TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
		if (guards)
			ctx->print(ctx, "%%begin");
		n = cmd_exec(cmd, ctx);
		if (guards)
			ctx->print(ctx, "%%end");

		/* Return of -1 is an error. */
		if (n == -1)
			return (-1);

		/*
		 * A 1 return value means the command client is being attached
		 * (sent MSG_READY).
		 */
		if (n == 1) {
			retval = 1;

			/*
			 * The command client has been attached, so mangle the
			 * context to treat any following commands as if they
			 * were called from inside.
			 */
			if (ctx->curclient == NULL) {
				ctx->curclient = ctx->cmdclient;
				ctx->cmdclient = NULL;

				ctx->error = key_bindings_error;
				ctx->print = key_bindings_print;
				ctx->info = key_bindings_info;
			}
		}
	}
	return (retval);
}

void
cmd_list_free(struct cmd_list *cmdlist)
{
	struct cmd	*cmd;

	if (--cmdlist->references != 0)
		return;

	while (!TAILQ_EMPTY(&cmdlist->list)) {
		cmd = TAILQ_FIRST(&cmdlist->list);
		TAILQ_REMOVE(&cmdlist->list, cmd, qentry);
		cmd_free(cmd);
	}
	xfree(cmdlist);
}

size_t
cmd_list_print(struct cmd_list *cmdlist, char *buf, size_t len)
{
	struct cmd	*cmd;
	size_t		 off;

	off = 0;
	TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
		if (off >= len)
			break;
		off += cmd_print(cmd, buf + off, len - off);
		if (off >= len)
			break;
		if (TAILQ_NEXT(cmd, qentry) != NULL)
			off += xsnprintf(buf + off, len - off, " ; ");
	}
	return (off);
}