From 1f5ece26349b6f79f0ed4119085917f94f92688f Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Thu, 13 Aug 2020 07:19:23 -0300
Subject: Create Jekyll hook to add anchors to code block lines

---
 _plugins/add-anchor-to-code-block-line-numbers.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 _plugins/add-anchor-to-code-block-line-numbers.rb

(limited to '_plugins')

diff --git a/_plugins/add-anchor-to-code-block-line-numbers.rb b/_plugins/add-anchor-to-code-block-line-numbers.rb
new file mode 100644
index 0000000..d4cf763
--- /dev/null
+++ b/_plugins/add-anchor-to-code-block-line-numbers.rb
@@ -0,0 +1,20 @@
+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 class=\"code-line-anchor\" id=\"#{id}\" href=\"##{id}\">#{n}</a>"
+      end
+      code_block_counter += 1
+
+      PREFIX + anchored_line_numbers_array.join("\n") + POSTFIX
+    end
+  end
+end
-- 
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