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diff --git a/ssg5 b/ssg5
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+#!/bin/sh -e
+#
+# https://rgz.ee/bin/ssg5
+# Copyright 2018-2019 Roman Zolotarev <hi@romanzolotarev.com>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+
+main() {
+	test -n "$1" || usage
+	test -n "$2" || usage
+	test -n "$3" || usage
+	test -n "$4" || usage
+ 	test -d "$1" || no_dir "$1"
+ 	test -d "$2" || no_dir "$2"
+
+	src=$(readlink_f "$1")
+	dst=$(readlink_f "$2")
+
+	IGNORE=$(
+		if ! test -f "$src/.ssgignore"
+		then
+			printf ' ! -path "*/.*"'
+			return
+		fi
+		while read -r x
+		do
+			test -n "$x" || continue
+			printf ' ! -path "*/%s*"' "$x"
+		done < "$src/.ssgignore"
+	)
+
+	# files
+
+	title="$3"
+
+	h_file="$src/_header.html"
+	f_file="$src/_footer.html"
+	test -f "$f_file" && FOOTER=$(cat "$f_file") && export FOOTER
+	test -f "$h_file" && HEADER=$(cat "$h_file") && export HEADER
+
+	list_dirs "$src" |
+	(cd "$src" && cpio -pdu "$dst")
+
+	fs=$(
+ 	if test -f "$dst/.files"
+	then list_affected_files "$src" "$dst/.files"
+	else list_files "$1"
+	fi
+	)
+
+	if test -n "$fs"
+	then
+		echo "$fs" | tee "$dst/.files"
+
+		if echo "$fs" | grep -q '\.md$'
+		then
+			if test -x "$(which lowdown 2> /dev/null)"
+			then
+				echo "$fs" | grep '\.md$' |
+				render_md_files_lowdown "$src" "$dst" "$title"
+			else
+				if test -x "$(which Markdown.pl 2> /dev/null)"
+				then
+					echo "$fs" | grep '\.md$' |
+					render_md_files_Markdown_pl "$src" "$dst" "$title"
+				else
+					echo "couldn't find lowdown nor Markdown.pl"
+					exit 3
+				fi
+			fi
+		fi
+
+		echo "$fs" | grep '\.html$' |
+		render_html_files "$src" "$dst" "$title"
+
+		echo "$fs" | grep -Ev '\.md$|\.html$' |
+		(cd "$src" && cpio -pu "$dst")
+	fi
+
+	printf '[ssg] ' >&2
+	print_status 'file, ' 'files, ' "$fs" >&2
+
+
+	# sitemap
+
+	base_url="$4"
+	date=$(date +%Y-%m-%d)
+ 	urls=$(list_pages "$src")
+
+	test -n "$urls" &&
+	render_sitemap "$urls" "$base_url" "$date" > "$dst/sitemap.xml"
+
+	print_status 'url' 'urls' "$urls" >&2
+	echo >&2
+}
+
+
+readlink_f() {
+	file="$1"
+	cd "$(dirname "$file")"
+	file=$(basename "$file")
+	while test -L "$file"
+	do
+		file=$(readlink "$file")
+		cd "$(dirname "$file")"
+		file=$(basename "$file")
+	done
+	dir=$(pwd -P)
+	echo "$dir/$file"
+}
+
+
+print_status() {
+	test -z "$3" && printf 'no %s' "$2" && return
+
+	echo "$3" | awk -v singular="$1" -v plural="$2" '
+	END {
+		if (NR==1) printf NR " " singular
+		if (NR>1) printf NR " " plural
+	}'
+}
+
+
+usage() {
+	echo "usage: ${0##*/} src dst title base_url" >&2
+	exit 1
+}
+
+
+no_dir() {
+	echo "${0##*/}: $1: No such directory" >&2
+	exit 2
+}
+
+list_dirs() {
+	cd "$1" && eval "find . -type d ! -name '.' ! -path '*/_*' $IGNORE"
+}
+
+
+list_files() {
+	cd "$1" && eval "find . -type f ! -name '.' ! -path '*/_*' $IGNORE"
+}
+
+
+list_dependant_files () {
+ 	e="\\( -name '*.html' -o -name '*.md' -o -name '*.css' -o -name '*.js' \\)"
+	cd "$1" && eval "find . -type f ! -name '.' ! -path '*/_*' $IGNORE $e"
+}
+
+list_newer_files() {
+	cd "$1" && eval "find . -type f ! -name '.' $IGNORE -newer $2"
+}
+
+
+has_partials() {
+	grep -qE '^./_.*\.html$|^./_.*\.js$|^./_.*\.css$'
+}
+
+
+list_affected_files() {
+	fs=$(list_newer_files "$1" "$2")
+
+	if echo "$fs" | has_partials
+	then list_dependant_files "$1"
+	else echo "$fs"
+	fi
+}
+
+
+render_html_files() {
+	while read -r f
+	do render_html_file "$3" < "$1/$f" > "$2/$f"
+	done
+}
+
+
+render_md_files_lowdown() {
+	while read -r f
+	do
+		lowdown \
+		< "$1/$f" |
+		render_html_file "$3" \
+		> "$2/${f%\.md}.html"
+	done
+}
+
+
+render_md_files_Markdown_pl() {
+	while read -r f
+	do
+		Markdown.pl < "$1/$f" |
+		render_html_file "$3" \
+		> "$2/${f%\.md}.html"
+	done
+}
+
+
+render_html_file() {
+	# h/t Devin Teske
+	awk -v title="$1" '
+	{ body = body "\n" $0 }
+	END {
+		body = substr(body, 2)
+		if (body ~ /<[Hh][Tt][Mm][Ll]/) {
+			print body
+			exit
+		}
+		if (match(body, /<[[:space:]]*[Hh]1(>|[[:space:]][^>]*>)/)) {
+			t = substr(body, RSTART + RLENGTH)
+			sub("<[[:space:]]*/[[:space:]]*[Hh]1.*", "", t)
+			gsub(/^[[:space:]]*|[[:space:]]$/, "", t)
+			if (t) title = t " &mdash; " title
+		}
+		n = split(ENVIRON["HEADER"], header, /\n/)
+		for (i = 1; i <= n; i++) {
+			if (match(tolower(header[i]), "<title></title>")) {
+				head = substr(header[i], 1, RSTART - 1)
+				tail = substr(header[i], RSTART + RLENGTH)
+				print head "<title>" title "</title>" tail
+			} else print header[i]
+		}
+		print body
+		print ENVIRON["FOOTER"]
+	}'
+}
+
+
+list_pages() {
+	e="\\( -name '*.html' -o -name '*.md' \\)"
+	cd "$1" && eval "find . -type f ! -path '*/.*' ! -path '*/_*' $IGNORE $e" |
+	sed 's#^./##;s#.md$#.html#;s#/index.html$#/#'
+}
+
+
+render_sitemap() {
+	urls="$1"
+	base_url="$2"
+	date="$3"
+
+	echo '<?xml version="1.0" encoding="UTF-8"?>'
+	echo '<urlset'
+	echo 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'
+	echo 'xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9'
+	echo 'http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"'
+	echo 'xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'
+	echo "$urls" |
+	sed -E 's#^(.*)$#<url><loc>'"$base_url"'/\1</loc><lastmod>'\
+"$date"'</lastmod><priority>1.0</priority></url>#'
+	echo '</urlset>'
+}
+
+main "$@"