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#!/bin/sh

set -e -a

: ${SRC:=$PWD/src}
: ${DST:=./website}
: ${URL:=https://syndamia.com}
: ${AWK:="mawk"}

condition() {
	if [ -z "$FORCE_GEN" ]                                        \
		&& [ -d "$DST" ]                                          \
		&& [ -f "$DST/.commit" ]                                  \
		&& command -v git >/dev/null 2>&1                         \
		&& [ -z "$(git status -s)" ]                              \
		&& [ "$(cat "$DST"/.commit)" = "$(git rev-parse HEAD)" ]
	then
		echo "Output '$DST' is up to date with website source '$SRC'!"
		exit 0
	fi
}

patch() {
	while read -r folder
	do
		if [ -f "$folder.du" ] && [ ! "$folder.du" -ef "$folder/index.du" ]
		then
			rm "$folder/index.du" >/dev/null 2>&1
			ln "$folder.du" "$folder/index.du"
		fi
	done << EOF
$(find "$SRC" -maxdepth 1 -type d)
EOF

	if [ ! "src/favicon.ico" -ef "src/img/favicon.ico" ]
	then
		rm "src/favicon.ico" >/dev/null 2>&1
		ln "src/img/favicon.ico" "src/favicon.ico"
	fi
}

prepare() {
	mkdir -p "$DST"
	rm -r "$DST"/* 2>/dev/null || true
	cp -a "$SRC/." "$DST"
	rm "$DST/INIT.du"
}

build() {
	"$AWK" \
		-f ./dunbar/dunbar_awk/dunbar.awk \
		./dunbar/stdenv/lang/html.du ./dunbar/stdenv/code.du \
		-c --ignore-errors "$SRC/INIT.du" \
		$(find "$DST" -type f -name '*.du')

	date '+%e.%m.%Y %H:%M:%S %Z' > "$DST"/.build

	if command -v git >/dev/null 2>&1
	then
		git rev-parse HEAD > "$DST"/.commit
	fi
}

build_sitemap() {
	cat <<SITEMAP >"$DST"/sitemap.xml
<?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">
$("$AWK" -v date="$(date +%Y-%m-%d)"  '
	{
		URL = ENVIRON["URL"] substr($0, length(ENVIRON["DST"]) + 1)
		print "<url><loc>" URL "</loc><lastmod>" date "</lastmod><priority>1.0</priority></url>"
	}
' <<FILES
$(find "$DST" -type f -name '*.html')
FILES
)
</urlset>
SITEMAP
}

build_tiny() {
	mkdir -p "$DST.tiny"
	rm -r "$DST.tiny"/* 2>/dev/null || true
	cp -a "$DST/." "$DST.tiny"
	rm -rf "$DST.tiny"/*.css "$DST.tiny"/fonts/

	sed -i                                      \
	   -e '/rel="stylesheet"/d'                 \
	   -e '/<script/d'                          \
	   -e '/id="settingsWrapper"/,/<\/nav>/d'   \
	   -e '/id="scrollBtn"/d'                   \
	$(find "$DST.tiny" -type f -name "*.html")
}

fixup_local() {
	while read -r f
	do
		root="$(echo "$f" | sed 's|^./website\(.*\)/.*.html$|./\1/|g;s|[^/.]\+|..|g;s|//|/|g;s|\.\.\.\+|..|g')"
		sed -i 's \(\(href\|src\)="[^"]*/[^"./]*\)" \1/index.html" g;s \(\(href\|src\)="\)/ \1'"$root"' g;s \(\(href\|src\)="\([^/"][^/"]\|/[^/]\)*[^/"]\?\)/\+ \1/ g' "$f"
	done <<EOF
$(find "$DST" -type f -name '*.html')
EOF
}

#---#

[ -z "$1" ] && set prod

stages=''
C=0
for arg in "$@"
do
	case "$arg" in
		(*=*)
			eval "$arg"
			;;
		(common)
			stages="$stages condition patch prepare build"
			: $((C = C + 4))
			;;
		(local)
			stages="$stages condition patch prepare build build_sitemap fixup_local"
			: $((C = C + 6))
			;;
		(prod)
			stages="$stages condition patch prepare build build_sitemap build_tiny"
			: $((C = C + 6))
			;;
		(*)
			stages="$stages $arg"
			: $((C = C + 1))
	esac
done

N=1
for stage in $stages
do
	printf "[%d/%d] %s\n" "$N" "$C" "$stage"
	s="$(date +'%s.%3N')"
	if "$stage"
	then
		e="$(date +'%s.%3N')"
		$AWK 'BEGIN { printf "      %.3fs" ORS, ENVIRON["e"] - ENVIRON["s"] }'

		: $((N = N + 1))
	else
		exit $?
	fi
done