#!/bin/bash -euE

. libremessages

stem=pbs

list_commands() {
	find ${PATH//:/ } -type f -executable -name "$stem-*" \
		-printf '%f\n' 2>/dev/null | sed "s/^${stem}-//;/--/d" | sort
}

master_usage() {
	echo "Usage: ${stem} COMMAND [OPTIONS]"
	echo "Parabola Build System"
	echo
	echo "plumb-* commands are for internal use."
	echo
	echo "Commands:"
	list_commands | while read -r cmd; do
		help="$("$stem-$cmd" -h|sed -n 2p)"
		printf '  %-20s  %s\n' "$cmd" "$help"
	done
}

help_usage() {
	echo "Usage: ${stem} help [OPTIONS] COMMAND"
	echo "Shows the manual page for a command."
	echo ''
	echo 'Options:'
	echo '  -h            Show this message'
}

main() {
	if [[ $# < 1 ]]; then
		master_usage
	else
		if in_array '-h' "$@"; then
			help_usage
		else
			man "$stem-$1"
		fi
	fi
}

main "$@"