#!/bin/sh

#copied from: https://github.com/void-linux/socklog-void/blob/master/svlogtail

usage () {
	cat <<-'EOF'
	svlogtail [-f] [LOG...] - show svlogd logs conveniently
	Without arguments, show current logs of all services, uniquely.
	With arguments, show all logs of mentioned services
	
	With -f, follow log output.
	EOF
}

globexist() {
	[ -f "$1" ]
}

IFS='
'

fflag=false
if [ "$1" = -f ]; then
	shift
	fflag=true
fi

if [ $# = 0 ]; then
	cat /var/log/socklog/*/current | sort -u
	if $fflag; then
		tail -Fq -n0 /var/log/socklog/*/current | uniq
	fi
else
	old=
	cur=
	for log; do
		case "$log" in
			-*) usage; exit 1;;
		esac
		if [ -d /var/log/socklog/$log ]; then
			if globexist /var/log/socklog/$log/*.[us]; then
				old="$old$IFS/var/log/socklog/$log/*.[us]"
			fi
			cur="$cur$IFS/var/log/socklog/$log/current"
		else
			echo "no logs for $log" 1>&2
                        exit 1
		fi
	done
	cat $old $cur | sort
	if $fflag; then
		tail -Fq -n0 $cur
	fi
fi