#!/bin/sh

day="$(printf '%02d' "$1")"
[ -z "$1" ] && day="$(date +%d)"

echo "new log entry for day $day"

tmpf="$(mktemp)"

ed "$tmpf" || {
	echo "oops, try again"
	echo "$tmpf"
	exit 1
}

ed "decadv-2025.html" << EOF
/<!--newlog/
+,/-->/-t/-->/
?h3?s/-xx/-$day/g
/<p>/r $tmpf
w
EOF

rm "$tmpf"