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-= Anchor headers and code lines in Jekyll
-
-:empty:
-:jekyll: https://jekyllrb.com/
-:kramdown: https://kramdown.gettalong.org/
-:rouge: https://rouge.jneen.net/
-:jekyll-hook: https://jekyllrb.com/docs/plugins/hooks/
-
-The default Jekyll toolbox ({jekyll}[Jekyll], {kramdown}[kramdown] and
-{rouge}[rouge]) doesn't provide with a configuration option to add anchors to
-headers and code blocks.
-
-The best way I found of doing this is by creating a simple Jekyll plugin, more
-specifically, a {jekyll-hook}[Jekyll hook].  These allow you to jump in to the
-Jekyll build and add a processing stage before of after Jekyll performs
-something.
-
-All you have to do is add the code to `_plugins/my-jekyll-plugin-code.rb`, and
-Jekyll knows to pick it up and call your code on the appropriate time.
-
-== Anchor on headers
-
-:jemoji: https://github.com/jekyll/jemoji
-:jekyll-mentions: https://github.com/jekyll/jekyll-mentions
-:html-regex: https://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454
-
-Since I wanted to add anchors to headers in all documents, this Jekyll hook
-works on `:documents` after they have been transformed into HTML, the
-`:post_render` phase:
-
-[source,ruby]
-----
-Jekyll::Hooks.register :documents, :post_render do |doc|
-  if doc.output_ext == ".html"
-    doc.output =
-      doc.output.gsub(
-        /<h([1-6])(.*?)id="([\w-]+)"(.*?)>(.*?)<\/h[1-6]>/,
-        '<a href="#\3"><h\1\2id="\3"\4>\5</h\1></a>'
-      )
-  end
-end
-----
-
-I've derived my implementations from two
-"official"{empty}footnote:official[
-  I don't know how official they are, I just assumed it because they live in the
-  same organization inside GitHub that Jekyll does.
-] hooks, {jemoji}[jemoji] and {jekyll-mentions}[jekyll-mentions].
-
-All I did was to wrap the header tag inside an `<a>`, and set the `href` of that
-`<a>` to the existing id of the header.  Before the hook the HTML looks like:
-
-[source,html]
-----
-...some unmodified text...
-<h2 id="my-header">
-  My header
-</h2>
-...more unmodified text...
-----
-
-And after the hook should turn that into:
-
-[source,html]
-----
-...some unmodified text...
-<a href="#my-header">
-  <h2 id="my-header">
-    My header
-  </h2>
-</a>
-...more unmodified text...
-----
-
-The used regexp tries to match only h1-h6 tags, and keep the rest of the HTML
-attributes untouched, since this isn't a general HTML parser, but the generated
-HTML is somewhat under your control.  Use at your own risk because
-{html-regex}[you shouldn't parse HTML with regexps].  Also I used this strategy
-in my environment, where no other plugins are installed.  I haven't considered
-how this approach may conflict with other Jekyll plugins.
-
-In the new anchor tag you can add your custom CSS class to style it as you wish.
-
-== Anchor on code blocks
-
-Adding anchors to code blocks needs a little bit of extra work, because line
-numbers themselves don't have preexisting ids, so we need to generate them
-without duplications between multiple code blocks in the same page.
-
-Similarly, this Jekyll hook also works on `:documents` in the `:post_render`
-phase:
-
-[source,ruby]
-----
-PREFIX = '<pre class="lineno">'
-POSTFIX = '</pre>'
-Jekyll::Hooks.register :documents, :post_render do |doc|
-  if doc.output_ext == ".html"
-    code_block_counter = 1
-    doc.output = doc.output.gsub(/<pre class="lineno">[\n0-9]+<\/pre>/) do |match|
-      line_numbers = match
-                      .gsub(/<pre class="lineno">([\n0-9]+)<\/pre>/, '\1')
-                      .split("\n")
-
-      anchored_line_numbers_array = line_numbers.map do |n|
-        id = "B#{code_block_counter}-L#{n}"
-        "<a id=\"#{id}\" href=\"##{id}\">#{n}</a>"
-      end
-      code_block_counter += 1
-
-      PREFIX + anchored_line_numbers_array.join("\n") + POSTFIX
-    end
-  end
-end
-----
-
-This solution assumes the default Jekyll toolbox with code line numbers turned
-on in `_config.yml`:
-
-[source,yaml]
-----
-kramdown:
-  syntax_highlighter_opts:
-    span:
-      line_numbers: false
-    block:
-      line_numbers: true
-----
-
-The anchors go from B1-L1 to BN-LN, using the `code_block_counter` to track
-which code block we're in and don't duplicate anchor ids.  Before the hook the
-HTML looks like:
-
-[source,html]
-----
-...some unmodified text...
-<pre class="lineno">1
-2
-3
-4
-5
-</pre>
-...more unmodified text...
-----
-
-And after the hook should turn that into:
-
-[source,html]
-----
-...some unmodified text...
-<pre class="lineno"><a id="B1-L1" href="#B1-L1">1</a>
-<a id="B1-L2" href="#B1-L2">2</a>
-<a id="B1-L3" href="#B1-L3">3</a>
-<a id="B1-L4" href="#B1-L4">4</a>
-<a id="B1-L5" href="#B1-L5">5</a></pre>
-...more unmodified text...
-----
-
-Happy writing :)