#!/bin/bash

# hitler.rip
# script to build my website using pandoc
# © 2025 hitler.rip <git@hitler.rip>
# licensed under AGPLv3-or-later; see licenses/code.md for more information

filterfile=($( realfile ./con/links.lua ))
convert () {
	pandoc "$1" -o "$2" \
		-f gfm -t html5 \
		--lua-filter="$filterfile"
}

echo "[build] starting to build webpage..."

rm -rf ./tmp/
rm -rf ./web
mkdir -p ./con/
mkdir -p ./src/articles/
mkdir -p ./tmp/articles/
mkdir -p ./web/articles/
mkdir -p ./web/licenses/
mkdir -p ./dir/

touch ./con/header.html
touch ./con/footer.html
touch ./con/style.css
touch ./con/rss-header.xml
touch ./con/rss-footer.xml
touch ./con/contact.md
touch ./src/index.md
touch ./src/articles/index.md

echo "[build] writing index..."
cd ./src/

for i in *.md; do

	echo "[build] converting: $i"

	filename=$( echo "$i" | rev | cut -c4- | rev )
	convert "$i" "../tmp/$filename.html"

	if [ "$filename" == "index" ]; then 

		convert "../con/contact.md" "../tmp/con-contact-tmp-file.html"

		cat ../con/header.html \
			../tmp/"$filename".html \
			../tmp/con-contact-tmp-file.html \
			../con/footer.html \
			> ../web/"$filename".html

		cat "$i" \
			../con/contact.md \
			> ../web/"$filename".md

	else

		mkdir -p ../web/"$filename"/

		cat ../con/header.html \
			../tmp/"$filename".html \
			../con/footer.html \
			> ../web/"$filename"/index.html

		cp "$i" ../web/"$filename"/index.md

	fi

done

echo "[build] writing articles..."
cd ./articles/

for i in *.md; do

	echo "[build] converting: $i"

	filename=$( echo "$i" | rev | cut -c4- | rev )
	convert "$i" "../../tmp/articles/$filename.html"

	if [ "$filename" == "index" ]; then
		echo "[build] skipping index file for later..."
	else

		mkdir -p ../../web/articles/"$filename"/

		cat ../../con/header.html \
			../../tmp/articles/"$filename".html \
			../../con/footer.html \
			> ../../web/articles/"$filename"/index.html

		cp "$i" ../../web/articles/"$filename"/index.md

		export WEBMETA_TITLE=""
		export WEBMETA_DATE=""
		export WEBMETA_AUTH=""
		export WEBMETA_SUMMARY=""

		if [ -e "$filename".meta ]; then
			echo "[build] running script: $filename.meta"
			source ./"$filename".meta
			# `.meta` is a simple shell script that uses `export` to
			# set some variables, notably:
			# WEBMETA_TITLE (title string)
			# WEBMETA_DATE (date string YYYY-MM-DD)
			# WEBMETA_AUTH (author string)
			# WEBMETA_SUMMARY (summary string)
			# please note that you have to actually check if this data is correct
			# and you should not just import random `.meta` files as they can arbitrarily
			# execute code on your system and are directly injected into the HTML.
		fi
		
		if [ "$WEBMETA_DATE" == "" ]; then
			export WEBMETA_DATE="2001-09-11*REDACTED!*"
		fi
		if [ "$WEBMETA_AUTH" == "" ]; then
			export WEBMETA_AUTH="Anonymous"
		fi
		if [ "$WEBMETA_SUMMARY" == "" ]; then
			export WEBMETA_SUMMARY="redacted"
		fi
		if [ "$WEBMETA_TITLE" == "" ]; then
			export WEBMETA_TITLE="$filename"
		fi

		touch ../../tmp/articles/gen-articles-tmp-list.html
		tee -a ../../tmp/articles/gen-articles-tmp-list.html > /dev/null << EOF
		<article>
			<a href="$filename"><h2>$WEBMETA_TITLE</h2></a>
			<h6><code>$WEBMETA_DATE</code> by $WEBMETA_AUTH</h6>
			<p>$WEBMETA_SUMMARY</p>
		</article>
EOF

		touch ../../tmp/articles/gen-articles-tmp-list.md
		tee -a ../../tmp/articles/gen-articles-tmp-list.md > /dev/null << EOF

## [$WEBMETA_TITLE]($filename)
###### \`$WEBMETA_DATE\` by $WEBMETA_AUTH
$WEBMETA_SUMMARY
EOF

		touch ../../tmp/articles/gen-articles-tmp-rss.xml
		tee -a ../../tmp/articles/gen-articles-tmp-rss.xml > /dev/null << EOF
		<item>
			<title>$WEBMETA_TITLE</title>
			<pubDate>$(date -d "${WEBMETA_DATE:0:10}" +"%a, %d %b %Y %H:%M:%S +0000" )</pubDate>
			<author>$WEBMETA_AUTHOR</author>
			<description>$WEBMETA_SUMMARY</description>
			<link>/$filename</link>
			<guid>/$filename</guid>
		</item>
EOF

	fi

done

cd ../..

echo "[build] generating feed..."

cat ./con/header.html \
	./tmp/articles/index.html \
	./tmp/articles/gen-articles-tmp-list.html \
	./con/footer.html \
	> ./web/articles/index.html

cat ./src/articles/index.md \
	./tmp/articles/gen-articles-tmp-list.md \
	> ./web/articles/index.md

cat ./con/rss-header.xml \
	./tmp/articles/gen-articles-tmp-rss.xml \
	./con/rss-footer.xml \
	> ./web/articles/feed.xml

echo "[build] copying static files..."
cp ./con/style.css ./web/style.css
cp ./con/icon.png ./web/icon.png
cp ./licenses/* ./web/licenses/
cp -r ./dir/* ./web/

echo "[build] removing temporary build files..."
rm -rf ./tmp

echo "[build] done!"