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If the target pane for send-keys in in a mode with a key table (that is,
copy mode), then look the key up in the table and fire any command
instead of delivering the key to the pane directly where it will be
ignored. This makes C-b C-b (send-prefix) work in copy mode again.

/* $OpenBSD: cmd-send-keys.c,v 1.40 2017/05/09 17:56:55 nicm Exp $ */

/*
 * Copyright (c) 2008 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 <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Send keys to client.
 */

static enum cmd_retval	cmd_send_keys_exec(struct cmd *, struct cmdq_item *);

const struct cmd_entry cmd_send_keys_entry = {
	.name = "send-keys",
	.alias = "send",

	.args = { "lXRMN:t:", 0, -1 },
	.usage = "[-lXRM] [-N repeat-count] " CMD_TARGET_PANE_USAGE " key ...",

	.target = { 't', CMD_FIND_PANE, 0 },

	.flags = CMD_AFTERHOOK,
	.exec = cmd_send_keys_exec
};

const struct cmd_entry cmd_send_prefix_entry = {
	.name = "send-prefix",
	.alias = NULL,

	.args = { "2t:", 0, 0 },
	.usage = "[-2] " CMD_TARGET_PANE_USAGE,

	.target = { 't', CMD_FIND_PANE, 0 },

	.flags = CMD_AFTERHOOK,
	.exec = cmd_send_keys_exec
};

static void
cmd_send_keys_inject(struct client *c, struct cmdq_item *item, key_code key)
{
	struct window_pane	*wp = item->target.wp;
	struct session		*s = item->target.s;
	struct key_table	*table;
	struct key_binding	*bd, bd_find;

	if (wp->mode == NULL || wp->mode->key_table == NULL) {
		window_pane_key(wp, NULL, s, key, NULL);
		return;
	}
	table = key_bindings_get_table(wp->mode->key_table(wp), 1);

	bd_find.key = (key & ~KEYC_XTERM);
	bd = RB_FIND(key_bindings, &table->key_bindings, &bd_find);
	if (bd != NULL) {
		table->references++;
		key_bindings_dispatch(bd, c, NULL, &item->target);
		key_bindings_unref_table(table);
	}
}

static enum cmd_retval
cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct client		*c = cmd_find_client(item, NULL, 1);
	struct window_pane	*wp = item->target.wp;
	struct session		*s = item->target.s;
	struct mouse_event	*m = &item->shared->mouse;
	struct utf8_data	*ud, *uc;
	wchar_t			 wc;
	int			 i, literal;
	key_code		 key;
	u_int			 np = 1;
	char			*cause = NULL;

	if (args_has(args, 'N')) {
		np = args_strtonum(args, 'N', 1, UINT_MAX, &cause);
		if (cause != NULL) {
			cmdq_error(item, "repeat count %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
		if (args_has(args, 'X') || args->argc == 0)
			wp->modeprefix = np;
	}

	if (args_has(args, 'X')) {
		if (wp->mode == NULL || wp->mode->command == NULL) {
			cmdq_error(item, "not in a mode");
			return (CMD_RETURN_ERROR);
		}
		if (!m->valid)
			wp->mode->command(wp, c, s, args, NULL);
		else
			wp->mode->command(wp, c, s, args, m);
		return (CMD_RETURN_NORMAL);
	}

	if (args_has(args, 'M')) {
		wp = cmd_mouse_pane(m, &s, NULL);
		if (wp == NULL) {
			cmdq_error(item, "no mouse target");
			return (CMD_RETURN_ERROR);
		}
		window_pane_key(wp, NULL, s, m->key, m);
		return (CMD_RETURN_NORMAL);
	}

	if (self->entry == &cmd_send_prefix_entry) {
		if (args_has(args, '2'))
			key = options_get_number(s->options, "prefix2");
		else
			key = options_get_number(s->options, "prefix");
		cmd_send_keys_inject(c, item, key);
		return (CMD_RETURN_NORMAL);
	}

	if (args_has(args, 'R')) {
		window_pane_reset_palette(wp);
		input_reset(wp, 1);
	}

	for (; np != 0; np--) {
		for (i = 0; i < args->argc; i++) {
			literal = args_has(args, 'l');
			if (!literal) {
				key = key_string_lookup_string(args->argv[i]);
				if (key != KEYC_NONE && key != KEYC_UNKNOWN)
					cmd_send_keys_inject(c, item, key);
				else
					literal = 1;
			}
			if (literal) {
				ud = utf8_fromcstr(args->argv[i]);
				for (uc = ud; uc->size != 0; uc++) {
					if (utf8_combine(uc, &wc) != UTF8_DONE)
						continue;
					cmd_send_keys_inject(c, item, wc);
				}
				free(ud);
			}
		}

	}

	return (CMD_RETURN_NORMAL);
}