#!/bin/bash -e
shopt -s globstar

tree_output=$(mktemp "/tmp/$USER.XXXXXXXXXX")
tree_file=$(mktemp "/tmp/$USER.XXXXXXXXXX")
trap "rm \"$tree_output\" \"$tree_file\"" EXIT

# Variables included in the pandoc template
now="$(date -Iseconds)"
generator="$(pandoc --version | head -n1)"

function convert {
	pandoc \
		--read markdown \
		--write html \
		--standalone \
		--template template.html \
		--highlight-style zenburn \
		--css "/~$USER/theme.css" \
		--variable generator="$generator" \
		--variable now="$now" \
		-o "$2" \
		"$1"
	chmod 644 "$2"
}

for file in content/**/*.md; do
	output="${file/#content/html}"
	output="${output/%.md/.html}"
	mkdir -p "$(dirname "$output")"
	chmod 711 "$(dirname "$output")"
	echo "Building $file to $output"
	convert "$file" "$output"
done

function link_assets {
	for src in "$1"/*; do
		dest="${src/#assets/html}"
		if [ ! -h "$dest" ] && [ -d "$dest" ]; then
			link_assets "$src"
		else
			echo "Symlinking $src to $dest"
			ln -fTs "$(echo "$dest" | sed 's|[^/]*/|../|g;s|/[^/]*$||')/$src" "$dest"
		fi
	done
}
link_assets assets

# Build the 'everything' page and CDF feed
echo 'Building article list'
pushd html >/dev/null
tree --du --si -X --prune -P '*.html' > "$tree_output"
popd >/dev/null

echo "---
title: everything
---
" > "$tree_file"
xsltproc xsl/tree-html.xsl "$tree_output" >> "$tree_file"
convert "$tree_file" "html/everything.html"

xsltproc xsl/tree-cdf.xsl "$tree_output" | xmllint --format - > "html/everything.cdf"
xmllint --noout --schema "assets/xsd/cdf.xsd" "html/everything.cdf"
chmod 644 "html/everything.cdf"

# Build an RSS feed
echo 'Building RSS feed'
echo '<?xml version="1.0"?>
<rss
  version="2.0"
  xmlns:admin="http://webns.net/mvcb/"
  xmlns:atom="http://www.w3.org/2005/Atom"
  xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule"
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>
  <channel>
    <title>~lucidiot'"'"'s wiki</title>
    <link>https://envs.net/~lucidiot/</link>
    <description>latest articles on ~lucidiot'"'"'s personal wiki</description>
    <language>en-FR</language>
    <copyright>Creative Commons BY 4.0 International, ~lucidiot</copyright>
    <managingEditor>lucidiot@envs.net (lucidiot)</managingEditor>
    <webMaster>lucidiot@envs.net (lucidiot)</webMaster>
    <generator>/bin/bash</generator>
    <docs>https://www.rssboard.org/rss-specification</docs>
    <admin:errorReportsTo rdf:resource="mailto:lucidiot@envs.net" />
    <admin:generatorAgent rdf:resource="https://tildegit.org/lucidiot/wiki/" />
    <atom:link rel="self" type="application/rss+xml" href="https://envs.net/~lucidiot/rss.xml" />
' > html/rss.xml

for file in content/**/*.md; do
	link="${file##content/}"
	link="https://envs.net/~lucidiot/${link/%.md/.html}"
	echo '<item>
    <title>'"$(sed -n 's|\s*title:\s*\(.*\)$|\1|p' "$file")"'</title>
    <pubDate>'"$(date -Rd "@$(stat -c%Y "$file")")"'</pubDate>
    <link>'"$link"'</link>
    <guid>'"$link"'</guid>
</item>' >> html/rss.xml
done
echo '  </channel>
</rss>' >> html/rss.xml
chmod 644 html/rss.xml