#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  mapentry FILENAME
		  mapentry -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -h, --help    show this message

		  FILENAME      the name of the input .md file


		Process FILENAME, and generate a "mapentry": an "<url>...</url>"
		entry to be included into the final sitemap.xml


		Examples:

		  Generate the sitemap entry entry for a TIL:

		    $ xmlentry src/til/a-til.md > src/til/a-til.mapentry
	EOF
}


for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

while getopts 'h' flag; do
	case "$flag" in
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

. src/lib.sh

FILENAME="${1:-}"
eval "$(assert_arg "$FILENAME" 'FILENAME')"


url_absolute="$(url-for "$FILENAME" | absolute)"
lastmod="$(git log -1 --format=%ad --date=short "$FILENAME")"
export url_absolute lastmod

envsubst < src/lib/mapentry.xml