Add log viewing helper based on svlogtail

utils/svlogs

@@ -0,0 +1,42 @@
+#!/bin/zsh
+# based on svlogtail from socklock-void package
+
+usage () {
+	cat <<-'EOF'
+	svlogs [-o] [LOG...] - show svlogd logs conveniently, for user services
+
+	Without arguments, show current logs of all services, uniquely.
+	With arguments, show all logs of mentioned services
+
+	Uses $SVLOGDIR as base for log directories if set, defaults to ~/.local/log
+
+	Options:
+		-o, --old  Show old logs, too
+	EOF
+}
+
+BASE_LOGDIR=${SVLOGDIR:-$HOME/.local/log}
+
+zparseopts -D -E o=showold -old=showold
+
+if [[ -z $@ ]]; then
+	cat ${showold:+$BASE_LOGDIR/*/*.[us](N)} $BASE_LOGDIR/*/current | sort -u
+	tail -Fq -n0 $BASE_LOGDIR/*/current | uniq
+else
+	old=()
+	cur=()
+	for log; do
+		case "$log" in
+			-*) usage; exit 1;;
+		esac
+		if [[ -d $BASE_LOGDIR/$log ]]; then
+			old+=( $BASE_LOGDIR/$log/*.[us](N) )
+			cur+=( $BASE_LOGDIR/$log/current )
+		else
+			echo "no logs for $log" 1>&2
+                        exit 1
+		fi
+	done
+	cat ${showold:+$old} $cur | sort
+	tail -Fq -n0 $cur
+fi