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#!/bin/sh
set -e

# usage: ./sitemap.sh <target dir> <output xml>

urlencode() (
	# urlencode <string>

	old_lc_collate=$LC_COLLATE
	LC_COLLATE=C

	length="${#1}"
	i=1
	while [ $i -le $length ] ; do
		c=$(expr substr "$1" $i 1) ;
		case $c in
			([a-zA-Z0-9./~_-])	printf "$c" ;;
			(*)			printf '%%%02X' "'$c" ;;
		esac ;
		true $((i=i+1)) ;
	done

	LC_COLLATE=$old_lc_collate
)

echo '<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" 
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' > $2

echo "$(find -L $1 -type d | sort | sed -e 's;^\./;;' -e '\;/\(css\|error\|favicon\|fonts\|js\|media\);d' -e 's;$;/;')" | \
while IFS='' read -r data ; do
	DATE=$(grep "last-modified" ${data}/index.html | cut -f 4 -d \" | sed 's/ /T/' ) ;
	urlencode "$data" | sed -e 's;^;<url><loc>https://;' -e "s;$;</loc><lastmod>${DATE}</lastmod></url>;" ;
	printf "\n" ;
done >> $2

echo '</urlset>' >> $2

cat $2