Module: MarkdownServer::Helpers::MarkdownHelpers

Defined in:
lib/markdown_server/helpers/markdown_helpers.rb

Instance Method Summary collapse

Instance Method Details

#extract_toc(html) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 206

def extract_toc(html)
  headings = []
  html.scan(/<h([1-6])\s[^>]*id="([^"]*)"[^>]*>(.*?)<\/h\1>/mi) do |level, id, text|
    clean_text = text.gsub(/<sup[^>]*id="fnref:[^"]*"[^>]*>.*?<\/sup>/i, "").gsub(/<[^>]+>/, "").strip
    headings << { level: level.to_i, id: id, text: clean_text }
  end
  headings
end

#parse_frontmatter(content) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 4

def parse_frontmatter(content)
  if content =~ /\A---\s*\n(.*?\n)---\s*\n(.*)/m
    begin
      meta = YAML.safe_load($1, permitted_classes: [Date, Time])
      body = $2
      [meta, body]
    rescue => e
      [nil, content]
    end
  else
    [nil, content]
  end
end

#render_frontmatter_value(value) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 170

def render_frontmatter_value(value)
  case value
  when Array
    value.map { |v|
      str = v.to_s
      if str.include?("[[")
        render_inline_wiki_links(str)
      else
        %(<span class="tag">#{h(str)}</span>)
      end
    }.join(" ")
  when String
    if value =~ /\Ahttps?:\/\//
      %(<a href="#{h(value)}" target="_blank" rel="noopener">#{h(value)}</a>)
    elsif value.include?("[[")
      render_inline_wiki_links(value)
    elsif value.length > 120
      render_markdown(value)
    else
      h(value)
    end
  when Numeric, TrueClass, FalseClass
    h(value.to_s)
  when NilClass
    %(<span class="empty">—</span>)
  else
    h(value.to_s)
  end
end

#render_inline_wiki_links(str) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 141

def render_inline_wiki_links(str)
  result = ""
  last_end = 0
  str.scan(/\[\[([^\]]+)\]\]/) do |match|
    raw = match[0]
    m_start = $~.begin(0)
    m_end = $~.end(0)
    result += h(str[last_end...m_start])
    target, display = raw.include?("|") ? raw.split("|", 2) : [raw, nil]
    label = display || target
    if target.start_with?("#")
      anchor = target[1..].downcase.gsub(/\s+/, "-").gsub(/[^\w-]/, "")
      result += %(<a class="wiki-link" href="##{h(anchor)}">#{h(label)}</a>)
    else
      file_part, anchor_part = target.split("#", 2)
      anchor_suffix = anchor_part ? "##{anchor_part.downcase.gsub(/\s+/, '-').gsub(/[^\w-]/, '')}" : ""
      resolved = resolve_wiki_link(file_part)
      if resolved
        result += %(<a class="wiki-link" href="/browse/#{encode_path_component(resolved).gsub('%2F', '/')}#{anchor_suffix}">#{h(label)}</a>)
      else
        result += %(<span class="wiki-link broken">#{h(label)}</span>)
      end
    end
    last_end = m_end
  end
  result += h(str[last_end..])
  result
end

#render_markdown(text) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 18

def render_markdown(text)
  # Convert mermaid code fences to raw HTML divs before Kramdown so Rouge
  # never touches them and the content is preserved exactly for Mermaid.js.
  text = text.gsub(/^```mermaid[ \t]*\r?\n([\s\S]*?)^```[ \t]*(\r?\n|\z)/m) do
    "<div class=\"mermaid\">\n#{h($1.rstrip)}\n</div>\n\n"
  end

  # Run plugin markdown transformations (e.g. Bible citation auto-linking)
  settings.plugins.each { |p| text = p.transform_markdown(text) }

  # Process wiki links BEFORE Kramdown so that | isn't consumed as
  # a GFM table delimiter.
  text = text.gsub(/\[\[([^\]]+)\]\]/) do
    raw = $1
    if raw.include?("|")
      target, display = raw.split("|", 2)
    else
      target = raw
      display = nil
    end

    if target.start_with?("#")
      heading_text = target[1..]
      anchor = heading_text.downcase.gsub(/\s+/, "-").gsub(/[^\w-]/, "")
      label = display || heading_text
      %(<a class="wiki-link" href="##{h(anchor)}">#{h(label)}</a>)
    else
      file_part, anchor_part = target.split("#", 2)
      anchor_suffix = anchor_part ? "##{anchor_part.downcase.gsub(/\s+/, '-').gsub(/[^\w-]/, '')}" : ""
      resolved = resolve_wiki_link(file_part)
      label = display || target
      if resolved
        %(<a class="wiki-link" href="/browse/#{encode_path_component(resolved).gsub('%2F', '/')}#{anchor_suffix}">#{h(label)}</a>)
      else
        %(<span class="wiki-link broken">#{h(label)}</span>)
      end
    end
  end

  html = Kramdown::Document.new(
    text,
    input: "GFM",
    syntax_highlighter: "rouge",
    syntax_highlighter_opts: { default_lang: "text" },
    hard_wrap: settings.hard_wrap
  ).to_html

  # Restore non-numeric footnote labels: Kramdown converts all footnote
  # references to sequential numbers, but we want [^abc] to display "abc".
  html = html.gsub(%r{<sup id="fnref:([^"]+)"[^>]*>\s*<a href="#fn:\1"[^>]*>\d+</a>\s*</sup>}m) do
    full_match = $&
    name = $1
    if name =~ /\A\d+\z/
      full_match
    else
      %(<sup id="fnref:#{name}" role="doc-noteref"><a href="#fn:#{name}" class="footnote" rel="footnote">#{h(name)}</a></sup>)
    end
  end
  html.gsub(%r{<li id="fn:([^"]+)"[^>]*>\s*<p>}m) do
    full_match = $&
    name = $1
    if name =~ /\A\d+\z/
      full_match
    else
      %(<li id="fn:#{name}"><p><strong>#{h(name)}:</strong> )
    end
  end
end

#resolve_wiki_link(name) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 87

def resolve_wiki_link(name)
  filename = "#{name}.md"
  base = File.realpath(root_dir)
  # On case-sensitive filesystems (Linux/Docker), FNM_CASEFOLD doesn't help
  # with directory listings. Try exact filename first, then lowercased variant.
  candidates = [filename]
  candidates << filename.downcase if filename != filename.downcase

  # Check the current file's directory first (exact case, then case-insensitive)
  if @current_wiki_dir
    local_exact = nil
    local_ci = nil
    candidates.each do |fn|
      Dir.glob(File.join(@current_wiki_dir, fn)).each do |path|
        real = File.realpath(path) rescue next
        next unless real.start_with?(base)
        relative = real.sub("#{base}/", "")
        first_segment = relative.split("/").first
        next if EXCLUDED.include?(first_segment) || first_segment&.start_with?(".")
        if File.basename(real) == filename
          local_exact = relative
          break
        else
          local_ci ||= relative
        end
      end
      break if local_exact
    end
    return local_exact if local_exact
    return local_ci if local_ci
  end

  # Fall back to global recursive search
  exact_match = nil
  ci_match = nil
  candidates.each do |fn|
    Dir.glob(File.join(base, "**", fn)).each do |path|
      real = File.realpath(path) rescue next
      next unless real.start_with?(base)
      relative = real.sub("#{base}/", "")
      first_segment = relative.split("/").first
      next if EXCLUDED.include?(first_segment) || first_segment&.start_with?(".")
      if File.basename(real) == filename
        exact_match ||= relative
      else
        ci_match ||= relative
      end
    end
    break if exact_match
  end

  exact_match || ci_match
end

#syntax_highlight(code, language) ⇒ Object 



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# File 'lib/markdown_server/helpers/markdown_helpers.rb', line 200

def syntax_highlight(code, language)
  formatter = Rouge::Formatters::HTML.new
  lexer = Rouge::Lexer.find_fancy(language) || Rouge::Lexers::PlainText.new
  formatter.format(lexer.lex(code))
end