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270 lines
13 KiB
HTML
270 lines
13 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<!-- Created by htmlize-1.56 in css mode. -->
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<html>
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<head>
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<title>generate-blog.bash</title>
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</head>
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<body>
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<pre>
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<span class="comment-delimiter">#</span><span class="comment">!/bin/</span><span class="keyword">bash</span><span class="comment">
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</span><span class="comment-delimiter">##</span><span class="comment">
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</span><span class="comment-delimiter"># </span><span class="comment">Generate html page with blog article excerpts from ./posts.txt. Post file names should
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</span><span class="comment-delimiter"># </span><span class="comment">be added to ./posts.txt in the exact order that they are supposed to appear on the blog
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</span><span class="comment-delimiter"># </span><span class="comment">page.
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</span>
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<span class="comment-delimiter"># </span><span class="comment">Check if required executables can be found
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</span><span class="keyword">if ! </span><span class="builtin">type</span> readlink dirname html2text mv cat cksum base64; <span class="keyword">then</span>
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<span class="builtin">echo</span> <span class="string">'One or more required executables are not present. Generation cancelled'</span> >&2
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<span class="keyword">exit</span> 1
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<span class="keyword">fi</span>
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<span class="comment-delimiter"># </span><span class="comment">Determine script directory (requires GNU readlink)
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</span><span class="variable-name">here</span>=<span class="string">"$(</span><span class="sh-quoted-exec">dirname</span><span class="string"> "$(</span><span class="sh-quoted-exec">readlink</span><span class="string"> -f "${BASH_SOURCE[0]}")")"</span>
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<span class="builtin">printf</span> <span class="string">'Changing directory: '</span>
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<span class="builtin">pushd</span> <span class="string">"$here"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="variable-name">posts_file</span>=<span class="string">"$here/posts.txt"</span>
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<span class="keyword">if</span> <span class="negation-char">!</span> [[ -f <span class="string">"$posts_file"</span> ]]; <span class="keyword">then</span>
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<span class="builtin">printf</span> <span class="string">'Posts file "%s" not found. Generation cancelled.\n'</span> <span class="string">"$posts_file"</span> >&2
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<span class="keyword">exit</span> 1
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<span class="keyword">fi</span>
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<span class="function-name">escape-html</span>() {
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sed <span class="string">'s/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&#39;/g'</span>
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}
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<span class="function-name">html-to-text</span>() {
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html2text -nobs -style compact <span class="string">"$@"</span>
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}
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<span class="function-name">print-blog-html-top</span>() {
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<span class="builtin">echo</span> <span class="string">'<html>
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<head>
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<title>Blog</title>
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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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html {
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font-family: Helvetica, Arial, sans-serif;
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color: #5b4636;
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background-color: #f4ecd8;
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}
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body {
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padding: 1em;
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margin: auto;
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}
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@media only all and (pointer: coarse), (pointer: none) {
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body {
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font-size: 5.5vmin;
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}
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}
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@media only all and (pointer: fine) {
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body {
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font-size: calc(16px + 0.6vmin);
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min-width: 500px;
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max-width: 50em;
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}
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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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'</span>
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}
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<span class="function-name">print-blog-html-bottom</span>() {
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<span class="builtin">echo</span> <span class="string">' </body>
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</html>'</span>
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}
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<span class="comment-delimiter"># </span><span class="comment">Note: pubDate and lastBuildDate are both set to the current time.
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</span><span class="function-name">print-blog-rss-top</span>() {
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cat <<EOF<span class="sh-heredoc">
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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>$(</span><span class="sh-quoted-exec">date</span><span class="sh-heredoc">)</pubDate>
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<lastBuildDate>$(</span><span class="sh-quoted-exec">date</span><span class="sh-heredoc">)</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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</span>}
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<span class="function-name">print-blog-rss-bottom</span>() {
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<span class="builtin">echo</span> <span class="string">'</channel>
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</rss>'</span>
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}
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<span class="function-name">el</span>() {
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<span class="variable-name">format_string</span>=<span class="string">"$1"</span>
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<span class="builtin">shift</span>
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<span class="builtin">printf</span> <span class="string">"<$format_string>"</span> <span class="string">"$@"</span>
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}
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<span class="function-name">el-close</span>() {
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<span class="builtin">echo</span> <span class="string">"</$1>"</span>
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}
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<span class="function-name">el-enclose</span>() {
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<span class="variable-name">element_name</span>=<span class="string">"$1"</span>
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<span class="builtin">shift</span>
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<span class="builtin">printf</span> <span class="string">'%s'</span> <span class="string">"<$element_name>"</span>
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<span class="builtin">printf</span> <span class="string">'%s'</span> <span class="string">"$@"</span>
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<span class="builtin">printf</span> <span class="string">'%s'</span> <span class="string">"</$element_name>"</span>
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}
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<span class="variable-name">site_url</span>=<span class="string">"https://hugot.nl"</span>
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<span class="variable-name">blog_html</span>=<span class="string">"$here/blog.html"</span>
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<span class="variable-name">new_html</span>=<span class="string">"$blog_html.new"</span>
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<span class="variable-name">blog_rss</span>=<span class="string">"$here/feed.xml"</span>
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<span class="variable-name">new_rss</span>=<span class="string">"$blog_rss.new"</span>
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print-blog-html-top > <span class="string">"$new_html"</span>
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print-blog-rss-top > <span class="string">"$new_rss"</span>
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<span class="keyword">while </span><span class="builtin">read</span> -r post_html; <span class="keyword">do</span>
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<span class="comment-delimiter"># </span><span class="comment">Convert the post's html to text to make it easier to use the blog's text
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</span> <span class="variable-name">text</span>=<span class="string">"$(</span><span class="sh-quoted-exec">html-to-text</span><span class="string"> "$post_html" | escape-html)"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="comment-delimiter"># </span><span class="comment">The title should be on the 2nd line of text, right after the link to the
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</span> <span class="comment-delimiter"># </span><span class="comment">homepage. This is a bit inflexible but it will do for now.
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</span> <span class="variable-name">title</span>=<span class="string">"$(</span><span class="sh-quoted-exec">tail</span><span class="string"> -n +2 <<<"$text" | head -n 1 | tr -d '*')"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="comment-delimiter"># </span><span class="comment">Use the first 5 lines after the title as post excerpt.
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</span> <span class="variable-name">excerpt</span>=<span class="string">"$(</span><span class="sh-quoted-exec">tail</span><span class="string"> -n +3 <<<"$text" | head -n 5)"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="comment-delimiter"># </span><span class="comment">Escape the post html file name to safely use it in the generated html.
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</span> <span class="variable-name">href</span>=<span class="string">"$(</span><span class="sh-quoted-exec">escape-html</span><span class="string"> <<<"$post_html")"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="variable-name">post_dir</span>=<span class="string">"$(</span><span class="sh-quoted-exec">dirname</span><span class="string"> "$post_html")"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="variable-name">pubdate_file</span>=<span class="string">"$post_dir/publish_date.txt"</span>
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<span class="comment-delimiter"># </span><span class="comment">Determine a publishing date for the post
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</span> <span class="keyword">if</span> [[ -f <span class="string">"$pubdate_file"</span> ]]; <span class="keyword">then</span>
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<span class="builtin">read</span> -r pubdate < <span class="string">"$pubdate_file"</span>
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<span class="keyword">else</span>
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<span class="variable-name">pubdate</span>=<span class="string">"$(</span><span class="sh-quoted-exec">date</span><span class="string">)"</span>
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<span class="builtin">echo</span> <span class="string">"$pubdate"</span> > <span class="string">"$pubdate_file"</span>
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<span class="keyword">fi</span>
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{
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el div
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el <span class="string">'a href="%s"'</span> <span class="string">"$href"</span>
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<span class="builtin">printf</span> <span class="string">'<h2 style="margin-bottom: 0.1em;">%s</h2>'</span> <span class="string">"$title"</span>
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el-close a
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<span class="builtin">printf</span> <span class="string">'<i style="font-size: 0.8em;">%s</i>'</span> <span class="string">"$pubdate"</span>
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el <span class="string">'p style="margin-top: 0.5em;"'</span>
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<span class="builtin">printf</span> <span class="string">'%s ... <a href="%s">Continue reading</a>'</span> <span class="string">"$excerpt"</span> <span class="string">"$href"</span>
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el-close p
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el-close div
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el hr
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} >> <span class="string">"$new_html"</span>
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{
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el item
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el-enclose title <span class="string">"$title"</span>
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el-enclose link <span class="string">"$site_url/$href"</span>
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el-enclose description <span class="string">"$excerpt"</span>
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el-enclose pubDate <span class="string">"$pubdate"</span>
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<span class="builtin">echo</span> <span class="string">"<guid isPermaLink=\"false\">$title$(</span><span class="sh-quoted-exec">base64</span><span class="string"> <(cksum <<<"$text"))</guid>"</span>
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el-close item
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} >> <span class="string">"$new_rss"</span>
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<span class="keyword"> done</span> < <span class="string">"$posts_file"</span>
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print-blog-html-bottom >> <span class="string">"$new_html"</span>
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print-blog-rss-bottom >> <span class="string">"$new_rss"</span>
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mv -v <span class="string">"$new_html"</span> <span class="string">"$blog_html"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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mv -v <span class="string">"$new_rss"</span> <span class="string">"$blog_rss"</span> || <span class="keyword">exit</span> $<span class="variable-name">?</span>
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<span class="builtin"> echo</span> <span class="string">'SUCCESS!'</span>
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</pre>
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</body>
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</html>
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