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#!/bin/bash
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##
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# Generate html page with blog article excerpts from ./posts.txt. Post file names should
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# be added to ./posts.txt in the exact order that they are supposed to appear on the blog
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# page.
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# Check if required executables can be found
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if ! type readlink dirname html2text mv cat cksum base64; then
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echo 'One or more required executables are not present. Generation cancelled' >&2
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exit 1
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fi
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# Determine script directory (requires GNU readlink)
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here="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
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printf 'Changing directory: '
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pushd "$here" || exit $?
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posts_file="$here/posts.txt"
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if ! [[ -f "$posts_file" ]]; then
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printf 'Posts file "%s" not found. Generation cancelled.\n' "$posts_file" >&2
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exit 1
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fi
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escape-html() {
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sed 's/&/\&/g; s/</\</g; s/>/\>/g; s/"/\"/g; s/'"'"'/\'/g'
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}
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html-to-text() {
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html2text -nobs -style compact "$@"
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}
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print-blog-html-top() {
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echo '<html>
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<head>
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<title>Blog</title>
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<link rel="stylesheet" type="text/css" href="style.css">
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<meta charset="UTF-8">
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</head>
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<style type="text/css">
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h2 a {
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color: #5b4636;
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text-decoration: none;
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}
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h2 a:visited {
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color: #5b4636;
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text-decoration: none;
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}
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</style>
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<body>
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<div style="display: flex; flex-direction: horizontal;">
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<a href="index.html">Home</a>
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<span style="margin-left: 1em; margin-right: 1em;">|</span>
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<a href="feed.xml">RSS Feed</a>
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</div>
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<h1>Blog</h1>
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'
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}
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print-blog-html-bottom() {
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echo ' </body>
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</html>'
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}
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# Note: pubDate and lastBuildDate are both set to the current time.
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print-blog-rss-top() {
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cat <<EOF
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<?xml version="1.0"?>
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<rss version="2.0">
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<channel>
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<title>Hugot Blog</title>
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<link>https://hugot.nl/blog.html</link>
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<description>Hugo's personal blog</description>
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<language>en-us</language>
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<pubDate>$(date)</pubDate>
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<lastBuildDate>$(date)</lastBuildDate>
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<docs>http://blogs.law.harvard.edu/tech/rss</docs>
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<generator>Hugo's Custom Bash Script</generator>
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<managingEditor>social@hugot.nl</managingEditor>
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<webMaster>infra@hugot.nl</webMaster>
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EOF
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}
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print-blog-rss-bottom() {
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echo '</channel>
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</rss>'
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}
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el() {
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format_string="$1"
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shift
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printf "<$format_string>" "$@"
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}
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el-close() {
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echo "</$1>"
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}
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el-enclose() {
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element_name="$1"
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shift
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printf '%s' "<$element_name>"
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printf '%s' "$@"
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printf '%s' "</$element_name>"
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}
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site_url="https://hugot.nl"
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blog_html="$here/blog.html"
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new_html="$blog_html.new"
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blog_rss="$here/feed.xml"
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new_rss="$blog_rss.new"
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print-blog-html-top > "$new_html"
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print-blog-rss-top > "$new_rss"
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while read -r post_html; do
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# Convert the post's html to text to make it easier to use the blog's text
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text="$(html-to-text "$post_html" | escape-html)" || exit $?
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# The title should be on the 2nd line of text, right after the link to the
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# homepage. This is a bit inflexible but it will do for now.
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title="$(tail -n +3 <<<"$text" | head -n 1 | tr -d '*')" || exit $?
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# Use the first 5 lines after the title as post excerpt.
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excerpt="$(tail -n +4 <<<"$text" | head -n 5)" || exit $?
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# Escape the post html file name to safely use it in the generated html.
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href="$(escape-html <<<"$post_html")" || exit $?
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post_dir="$(dirname "$post_html")" || exit $?
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pubdate_file="$post_dir/publish_date.txt"
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# Determine a publishing date for the post
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if [[ -f "$pubdate_file" ]]; then
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read -r pubdate < "$pubdate_file"
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else
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pubdate="$(date)"
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echo "$pubdate" > "$pubdate_file"
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fi
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{
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el div
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printf '<h2 style="margin-bottom: 0.1em;"><a href="%s">%s</a></h2>' "$href" "$title"
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printf '<i style="font-size: 0.8em;">%s</i>' "$pubdate"
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el 'p style="margin-top: 0.5em;"'
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printf '%s ... <a href="%s">Continue reading</a>' "$excerpt" "$href"
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el-close p
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el-close div
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el hr
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} >> "$new_html"
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{
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el item
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el-enclose title "$title"
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el-enclose link "$site_url/$href"
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el-enclose description "$excerpt"
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el-enclose pubDate "$pubdate"
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echo "<guid isPermaLink=\"false\">$title$(base64 <(cksum <<<"$text"))</guid>"
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el-close item
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} >> "$new_rss"
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done < "$posts_file"
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print-blog-html-bottom >> "$new_html"
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print-blog-rss-bottom >> "$new_rss"
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mv -v "$new_html" "$blog_html" || exit $?
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mv -v "$new_rss" "$blog_rss" || exit $?
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echo 'SUCCESS!'
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