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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-copy-mode.c,v 1.30 2016/10/16 17:55:14 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.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 "tmux.h"

/*
 * Enter copy or clock mode.
 */

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

const struct cmd_entry cmd_copy_mode_entry = {
	.name = "copy-mode",
	.alias = NULL,

	.args = { "Met:u", 0, 0 },
	.usage = "[-Mu] " CMD_TARGET_PANE_USAGE,

	.tflag = CMD_PANE,

	.flags = CMD_AFTERHOOK,
	.exec = cmd_copy_mode_exec
};

const struct cmd_entry cmd_clock_mode_entry = {
	.name = "clock-mode",
	.alias = NULL,

	.args = { "t:", 0, 0 },
	.usage = CMD_TARGET_PANE_USAGE,

	.tflag = CMD_PANE,

	.flags = CMD_AFTERHOOK,
	.exec = cmd_copy_mode_exec
};

static enum cmd_retval
cmd_copy_mode_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct client		*c = cmdq->client;
	struct session		*s;
	struct window_pane	*wp = cmdq->state.tflag.wp;

	if (args_has(args, 'M')) {
		if ((wp = cmd_mouse_pane(&cmdq->mouse, &s, NULL)) == NULL)
			return (CMD_RETURN_NORMAL);
		if (c == NULL || c->session != s)
			return (CMD_RETURN_NORMAL);
	}

	if (self->entry == &cmd_clock_mode_entry) {
		window_pane_set_mode(wp, &window_clock_mode);
		return (CMD_RETURN_NORMAL);
	}

	if (wp->mode != &window_copy_mode) {
		if (window_pane_set_mode(wp, &window_copy_mode) != 0)
			return (CMD_RETURN_NORMAL);
		window_copy_init_from_pane(wp, args_has(self->args, 'e'));
	}
	if (args_has(args, 'M')) {
		if (wp->mode != NULL && wp->mode != &window_copy_mode)
			return (CMD_RETURN_NORMAL);
		window_copy_start_drag(c, &cmdq->mouse);
	}
	if (wp->mode == &window_copy_mode && args_has(self->args, 'u'))
		window_copy_pageup(wp, 0);

	return (CMD_RETURN_NORMAL);
}