#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  x COMMANDS... [ '&&' / '||' / '|' ] COMMANDS...
		  x -h
	EOF
}

help() {
	cat <<-'EOF'

		Options:
		  -h, --help    show this message

		  COMMAND       the command to be executed
		  &&            "AND" logical operator
		  ||            "OR" logical operator
		  |             pipe operator


		Run command chained together with operators.


		Examples:

		  Measure the time of two commands:

		    $ time x sleep 1 '&&' sleep 2
		    # same as:
		    $ time sh -c 'sleep 1 && sleep 2'


		  Notify when either of the commands finish:

		    $ boop x cmd-1 '||' cmd-2
	EOF
}

for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

while getopts 'h' flag; do
	case "$flag" in
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))


CMD=''
for arg in "$@"; do
	case "$arg" in
		'&&'|'||')
			set +e
			sh -c "$CMD"
			STATUS=$?
			set -e
			CMD=''
			if   [ "$arg" = '&&' ] && [ "$STATUS" != 0 ]; then
				exit "$STATUS"
			elif [ "$arg" = '||' ] && [ "$STATUS" = 0  ]; then
				exit 0
			fi
			;;
		*)
			CMD="$CMD${CMD:+ }'$arg'"
			;;
	esac
done

sh -c "$CMD"