#!/bin/sh

case $# in
0)
	uci -q get 'system.@system[0].pretty_hostname' || uci get 'system.@system[0].hostname'
	;;
1)
	pretty_hostname="$1"
	# Remove invalid characters and leading/trailing spaces
	hostname="$(echo -n "$pretty_hostname" | sed -r -e 's/[^a-zA-Z0-9-]//g' -e 's/-+/-/g' -e 's/^-//')"
	hostname="${hostname:0:63}"
	hostname="$(echo -n "$hostname" | sed -e 's/-$//')"

	if [ -z "$hostname" ]; then
		hostname='localhost'
	fi

	if [ "$hostname" = "$pretty_hostname" ]; then
		uci -q delete "system.@system[0].pretty_hostname"
	else
		uci set "system.@system[0].pretty_hostname=$pretty_hostname"
	fi

	uci set "system.@system[0].hostname=$hostname"
	uci commit system

	echo "$hostname" > /proc/sys/kernel/hostname
	;;
*)
	echo 'Usage: pretty-hostname [ hostname ]'
	exit 1
esac