#!/bin/zsh

if [ $# != 1 ]; then
	print "Usage: $0 <port>"
	exit 1
else
	theport=$1
	if [ ! -e deps.ports ]; then
		port dependents installed > deps.ports
	fi
	typeset -U dependents
	typeset -U newdeps
	typeset -U tempdeps
	newdeps=($(grep " ${theport}$" deps.ports | cut -d ' ' -f 1))
	dependents+=($newdeps)
	while [ $newdeps[0] ]; do
		tempdeps=()
		for i in $newdeps; do
			temp=($(grep ${i}$ deps.ports | cut -d ' ' -f 1))
			dependents+=($temp)
			tempdeps+=($temp)
		done
		newdeps=($tempdeps)
	done
	print $dependents
fi