#!/bin/bash
set -euo pipefail
shopt -s globstar

tree_output=$(mktemp "/tmp/${USER:-lucidiot-wiki}.XXXXXXXXXX")
tree_file=$(mktemp "/tmp/${USER:-lucidiot-wiki}.XXXXXXXXXX")
trap "rm \"$tree_output\" \"$tree_file\"" EXIT

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

function convert {
	# Usage: convert input_file output_file output_format
	if [ "$3" = html ]; then
		pandoc \
			--read markdown \
			--write html \
			--standalone \
			--table-of-contents \
			--template template.html \
			--highlight-style zenburn \
			--css "/~${USER:-lucidiot}/theme.css" \
			--variable generator="$generator" \
			--variable now="$now" \
			-o "$2" \
			"$1"
	else
		pandoc \
			--read markdown \
			--write "$3" \
			--table-of-contents \
			-o "$2" \
			"$1"
	fi
	chmod 644 "$2"
}

function convert_all_md {
	# Usage: convert_all_md output_directory file_extension pandoc_output_format
	local file
	local output
	echo "Converting all Markdown files to .$2 files under $1/"
	for file in content/**/*.md; do
		output="${file/#content/$1}"
		output="${output/%.md/.$2}"
		mkdir -p "$(dirname "$output")"
		chmod 755 "$(dirname "$output")"
		echo "  $file -> $output"
		convert "$file" "$output" "$3"
	done
}
convert_all_md html html html
convert_all_md gopher txt plain

function link_assets {
	echo "Copying assets from $1 to $2"
	for path in $1/*; do
		echo "  $path -> $2"
		cp -dr --no-preserve=mode "$path" "$2"
	done
	echo "  Fixing asset attributes"
	find "$1" -type d | sed "s|^$1|$2|" | xargs chmod 755
	find "$1" -type f | sed "s|^$1|$2|" | xargs chmod 644
}
link_assets assets html
link_assets assets gopher
link_assets html_assets html
link_assets gopher_assets gopher

# 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" 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>
    <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