lib/filters/convert_mermaid_html.rb


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# frozen_string_literal: true

class ConvertMermaidHtml < Nanoc::Filter
  identifier :convert_mermaid_html

  MERMAID_HTML_PATTERN = %r{<div\ class="mermaid">(?<mermaid_content>.*?)</div>}mx

  def run(content, params = {})
    content.gsub(MERMAID_HTML_PATTERN) { generate(Regexp.last_match[:mermaid_content]) }
  end

  def generate(content)
    fixed_content = content
      .gsub('&', '&amp;')
      .gsub('<', '&lt;')
      .gsub('>', '&gt;')
      .gsub('"', '&quot;')

    %(<div class="mermaid">#{fixed_content}</div>)
  end
end