#!/usr/bin/env bash
function incompatible_function() {
	:
}

compatible_function() {
	if ! [ "$1" == "yes" ]
	then
		return 3;:;
	fi
	
	(
		exec 3>&1
		echo "finished! $@? $*." >&3 \
			| cat | bat - | cat
		exit 4
	) || exit $?
}

if command -v bat &> /dev/null; then
	var=1
	printf "%s...\n" "$(echo some text)"
	while true; do
		echo $var

		if { [[ "$var" -eq 1 && ( true || false ) ]] || false 2>&1 1> /dev/null; } &> /dev/null; then
			var="$(cat <<< "two")"
			continue 1
		fi

		case "$var" in
			"two") var="three" ;;
			three) var="four" ;;
			fo*r)
				var=five
				;;

			"fi"ve)
				var="$(
					cat       << END
six > $var
END
				)"
				;;

			$'six\n' | *six*)
				echo "?"
				seven=seven
				while read -r line
				do
					var="$line"
				done << "HEREDOC"
1
2
$seven
HEREDOC
				;;

			*'sev'*)
				export var=eight
				unset var
				;;

			'')
				{ incompatible_function && false; } || compatible_function "yes"
				break
				;;
		esac

		continue
	done
fi