Add Docker-CLI wrapper

#!/bin/bash

set -eu -o pipefail

shopt -s lastpipe

declare CMD

declare -a OPTIONS=()

declare -a ARG=()

until [[ $# -eq 0 ]]; do

	case $1 in

		# Bool flag options; no option argument without '='

		--help|-D|--debug|-v|--version) OPTIONS+=( "$1" ) ;;

		--tls|--tlsverify) OPTIONS+=( "$1" ) ;;

		# Handle options with arguments & compacted flags

		--*=*) OPTIONS+=( "$1" ) ;;

		--*|-?) OPTIONS+=( "$1" ${2+"$2"} ); shift ;;

		-*) set -- ${1%${1#-?}} -${1#-?} "${@:2}"; continue ;;

		# End of run options; --rm not found so add it

		*) CMD=$1; shift; break ;;

	esac

	shift || break

done

cmd_run() {

	# Ensure --rm is in args if --detach is not

	until [[ $# -eq 0 ]]; do

		case $1 in

			# Shortcut --help, --rm and --detach; no need to add anything

			--help|--rm|-d|--detach*) ARG+=( "$@" ); return ;;

			# Bool flag options; no option argument without '='

			--init|-i|--interactive|--privileged) ARG+=( "$1" ) ;;

			--read-only|--sig-proxy|-t|--tty) ARG+=( "$1" ) ;;

			# Handle options with arguments & compacted flags

			--) ARG+=( "$@" ); return ;;

			--*=*) ARG+=( "$1" ) ;;

			--*|-?) ARG+=( "$1" ${2+"$2"} ); shift ;;

			-*) set -- ${1%${1#-?}} -${1#-?} "${@:2}"; continue ;;

			# End of run options; --rm not found so add it

			*) ARG+=( --rm "$@" ); return ;;

		esac

		shift || break

	done

}

case $CMD in

	run) cmd_run "$@" ;;

	*) ARG=( "$@" ) ;;

esac

for path in $(type -ap docker); do

	[[ $path -ef $0 ]] && continue

	exec $path "${OPTIONS[@]}" "$CMD" "${ARG[@]}"

done

echo >&2 "No 'docker' found on PATH"

exit 127