Jekyll plugin to replace Markdown code blocks (for mermaid syntax)

markdown-mermaid-replacement.rb

# modified from https://gist.github.com/mmistakes/77c68fbb07731a456805a7b473f47841
# Description: Jekyll plugin to replace Markdown code blocks (for mermaid syntax) with <div class="mermaid"> tag for crafting mermaid charts with minimal headache
# place in /_plugins/

Jekyll::Hooks.register :posts, :pre_render do |post, payload|
  docExt = post.extname.tr('.', '')
  # only process if we deal with a markdown file
  if payload['site']['markdown_ext'].include? docExt
    newContent = post.content.gsub(/```mermaid([^`]+?)```/, '<div class="mermaid">\1</div>')
    post.content = newContent
  end
end