From: Guillaume Marcais <guslist@...>
Date: 2005-03-18T08:39:51+09:00
Subject: Re: *cloth and ToC

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> [many insightful answers]

Well, with all the answers I got I finally wrote my own version. Right
now it support redcloth and textile (not markdown). The file is
attached.

To use it, with instiki for example, save it as redcloth_toc someplace
where it can be found by ruby (or add a -I option), and simply do:

$ ruby -r redcloth_toc /usr/bin/instiki --storage=/home/gus/tmp/storage

In my wiki pages I add:

<div class="rightHandSide">
Table of Content

toc2.

</div>

To get a beautiful ToC. The 2 in toc2. is optional. It is the maximum
depth of the table.

Hope this helps other people too.

Guillaume.

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require 'redcloth'

class RedCloth
  DEFAULT_RULES = [:refs_textile_header, :block_toc, 
    :textile, :markdown]

  HEADER_RE = /(^\s*)(h(\d*))([^.]*)\.(?::(\S+))? (.*)$/

  def refs_textile_header(text)
    text.gsub!(HEADER_RE) do |m|
      s,tag,num,atts,cite,content = $~[1..6]
      header = content.gsub(/\s/, '+')
      (@toc ||= []) << [num.to_i, header, content]
      "#{ s }#{ tag }#{ atts }.#{ cite } <a name=\"#{ header }\">#{ content }</a>"
    end
  end
  
  TOC_RE = /^toc(\d)?\.$/m

  def block_toc(text)
    if text =~ TOC_RE
      unless @toc
        text.gsub!( $&, "")
      else
        max_depth = $1 ? $1.to_i : 6
        counter = Array.new(max_depth, 0)
        toc_html = @toc.collect do |te|
          i = te[0] - 1
          if counter[i]
            num = ""
            counter[i] += 1
            num += counter[0..i].join(".")
            "\t<a href=\"##{ te[1] }\">#{ num } #{ te[2] }</a><br>"
          end
        end.join("\n")
        text.gsub!($&, toc_html)
      end
    end
    text.gsub!(TOC_RE, "Table of Content")
  end
end

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