HTML export: Export src block language as css class

Org mode exports source blocks with the language as a css-class of the exported
source block - it's easy enough to do the same.

org/html_writer.go

@@ -108,7 +108,8 @@ func (w *HTMLWriter) WriteBlock(b Block) {
 		if len(b.Parameters) >= 1 {
 			lang = strings.ToLower(b.Parameters[0])
 		}
-		w.WriteString(w.HighlightCodeBlock(content, lang) + "\n")
+		content = w.HighlightCodeBlock(content, lang)
+		w.WriteString(fmt.Sprintf("<pre class=\"src src-%s\">\n%s\n</pre>\n", lang, content))
 	case name == "EXAMPLE":
 		w.WriteString(`<pre class="example">` + "\n" + content + "\n</pre>\n")
 	case name == "EXPORT" && len(b.Parameters) >= 1 && strings.ToLower(b.Parameters[0]) == "html":

org/testdata/blocks.html

@@ -1,4 +1,5 @@
 <figure>
+<pre class="src src-bash">
 <div class="highlight">
 <pre>
 echo &#34;a bash source block&#34;
@@ -10,15 +11,18 @@ function hello {
 hello
 </pre>
 </div>
+</pre>
 <figcaption>
 block caption
 </figcaption>
 </figure>
+<pre class="src src-text">
 <div class="highlight">
 <pre>
 a source block without a language
 </pre>
 </div>
+</pre>
 <pre class="example">
 an example block with
 multiple lines including
@@ -120,11 +124,13 @@ this unindented line is outside of the list item
 <p>
 list item 2
 </p>
+<pre class="src src-text">
 <div class="highlight">
 <pre>
 #+BEGIN_EXAMPLE
 </pre>
 </div>
+</pre>
 <p>
 #+END_EXAMPLE
 </p>

org/testdata/captions.html

@@ -2,11 +2,13 @@
 Anything can be captioned.
 </p>
 <figure>
+<pre class="src src-sh">
 <div class="highlight">
 <pre>
 echo &#34;i have a caption!&#34;
 </pre>
 </div>
+</pre>
 <figcaption>
 captioned soure block
 </figcaption>

org/testdata/footnotes.html

@@ -70,11 +70,13 @@ and other elements
 <p>
 like blocks
 </p>
+<pre class="src src-text">
 <div class="highlight">
 <pre>
 other non-plain
 </pre>
 </div>
+</pre>
 </li>
 <li>
 <p>

org/testdata/headlines.html

@@ -68,9 +68,11 @@ headline with custom status
 <p>
 it&#39;s possible to use <code class="verbatim">#+SETUPFILE</code> - in this case the setup file contains the following
 </p>
+<pre class="src src-org">
 <div class="highlight">
 <pre>
 #+TODO: TODO DONE CUSTOM
 #+EXCLUDE_TAGS: noexport custom_noexport
 </pre>
 </div>
+</pre>

org/testdata/keywords.html

@@ -1,8 +1,9 @@
 <figure>
-<div class="highlight a b c d" id="it">
+<pre class="src src-sh a b c d" id="it"><div class="highlight">
 <pre>echo &#34;a bash source block with custom html attributes&#34;
 </pre>
 </div>
+</pre>
 <figcaption>
 and <span style="text-decoration: underline;">multiple</span> lines of <strong>captions</strong>!
 </figcaption>

org/testdata/lists.html

@@ -59,11 +59,13 @@ and some lines of text
 <p>
 and another subitem
 </p>
+<pre class="src src-sh">
 <div class="highlight">
 <pre>
 echo with a block
 </pre>
 </div>
+</pre>
 </li>
 <li>
 <p>
@@ -131,11 +133,13 @@ term<dd>
 details on a new line (with an empty line in between)
 <strong>continued</strong>
 </p>
+<pre class="src src-bash">
 <div class="highlight">
 <pre>
 echo &#34;Hello World!&#34;
 </pre>
 </div>
+</pre>
 <dd>
 </dl>
 <p>

org/testdata/misc.html

@@ -114,6 +114,7 @@ for now files can be included as:
 <p>
 src block
 </p>
+<pre class="src src-org">
 <div class="highlight">
 <pre>
 #+SETUPFILE: setup_file_org
@@ -146,6 +147,7 @@ this headline and it&#39;s content are not exported as it is marked with an =EXC
 By default =EXCLUDE_TAGS= is just =:noexport:=.
 </pre>
 </div>
+</pre>
 </li>
 <li>
 <p>
@@ -390,11 +392,13 @@ inline code <code class="verbatim">--</code> <code class="verbatim">---</code> a
 <p>
 src/example/export blocks should not be converted!
 </p>
+<pre class="src src-sh">
 <div class="highlight">
 <pre>
 --, ---
 </pre>
 </div>
+</pre>
 <pre class="example">
 --, ---
 </pre>
@@ -423,21 +427,25 @@ The behaviour of Org mode <code class="verbatim">&lt;s TAB</code> changed and it
 <p>
 lowercased:
 </p>
+<pre class="src src-bash">
 <div class="highlight">
 <pre>
 uname -a
 </pre>
 </div>
+</pre>
 </li>
 <li>
 <p>
 uppercased
 </p>
+<pre class="src src-bash">
 <div class="highlight">
 <pre>
 uname -a
 </pre>
 </div>
+</pre>
 </li>
 </ul>
 <h2 id="headline-24">
@@ -455,6 +463,7 @@ When inserting an image link like <img src="/home/amos/Pictures/Screenshots/img-
 <h3 id="headline-26">
 <a href="https://github.com/gohugoio/hugo/issues/4006">#4006</a> source code blocks in org not rendered correctly
 </h3>
+<pre class="src src-emacs-lisp">
 <div class="highlight">
 <pre>
 (defun small-shell ()
@@ -465,6 +474,7 @@ When inserting an image link like <img src="/home/amos/Pictures/Screenshots/img-
   (ansi-term))
 </pre>
 </div>
+</pre>
 <h1 id="headline-27">
 Footnotes
 </h1>