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Add a -r flag to switch-client to toggle the client read-only flag. From
Johan Commelin.

/* $OpenBSD: cmd-switch-client.c,v 1.13 2011/08/16 10:00:52 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Switch client to a different session.
 */

void	cmd_switch_client_key_binding(struct cmd *, int);
int	cmd_switch_client_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_switch_client_entry = {
	"switch-client", "switchc",
	"lc:npt:r", 0, 0,
	"[-lnpr] [-c target-client] [-t target-session]",
	CMD_READONLY,
	cmd_switch_client_key_binding,
	NULL,
	cmd_switch_client_exec
};

void
cmd_switch_client_key_binding(struct cmd *self, int key)
{
	self->args = args_create(0);
	switch (key) {
	case '(':
		args_set(self->args, 'p', NULL);
		break;
	case ')':
		args_set(self->args, 'n', NULL);
		break;
	case 'L':
		args_set(self->args, 'l', NULL);
		break;
	}
}

int
cmd_switch_client_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args	*args = self->args;
	struct client	*c;
	struct session	*s;

	if ((c = cmd_find_client(ctx, args_get(args, 'c'))) == NULL)
		return (-1);

	if (args_has(args, 'r')) {
		if (c->flags & CLIENT_READONLY) {
			c->flags &= ~CLIENT_READONLY;
			ctx->info(ctx, "made client writable");
		} else {
			c->flags |= CLIENT_READONLY;
			ctx->info(ctx, "made client read-only");
		}
	}

	s = NULL;
	if (args_has(args, 'n')) {
		if ((s = session_next_session(c->session)) == NULL) {
			ctx->error(ctx, "can't find next session");
			return (-1);
		}
	} else if (args_has(args, 'p')) {
		if ((s = session_previous_session(c->session)) == NULL) {
			ctx->error(ctx, "can't find previous session");
			return (-1);
		}
	} else if (args_has(args, 'l')) {
		if (c->last_session != NULL && session_alive(c->last_session))
			s = c->last_session;
		if (s == NULL) {
			ctx->error(ctx, "can't find last session");
			return (-1);
		}
	} else
		s = cmd_find_session(ctx, args_get(args, 't'), 0);
	if (s == NULL)
		return (-1);

	if (c->session != NULL)
		c->last_session = c->session;
	c->session = s;
	session_update_activity(s);

	recalculate_sizes();
	server_check_unattached();
	server_redraw_client(c);

	return (0);
}