Maruku Snippet Generation

maruku_html_snippet.rb

# encoding: UTF-8
require 'maruku'

## TODO or maybe not, we currently cut styling  -- == underlining if it is on the line after the cut off length.
# would you want a snippet ending with a heading though?

def maruku_html_snippet(markdown,lines=-1 )
  if lines == -1
    markdown_temp = markdown
  else
    markdown_a    = markdown.split("\n")
    markdown_temp = (markdown_a[0...lines]).join("\n")

    ## Is the input text longer than cut off length
    if markdown_a.size > lines
      ## Are we mid table ?
      mid_table       = false
      if markdown_a[lines-1].match(/\|/) and markdown_a[lines].match(/\|/)
        mid_table = true
      end

      ## Looking for markdown elements we can not break (Link targets, tables)
      (markdown_a[lines...(markdown_a.size)]).each_with_index do |text, index| 
        ## Make sure keep link targets
        if text.match(/^[ \t ]*\[[\W\w]*\]:[\W\w]*/)
          markdown_temp << "\n" + text
        end

         if mid_table
           #Still parsing table or have we finished
           if text.match(/\|/) 
             markdown_temp << "\n" + text
           else
             mid_table        = false
            end
         end

      end
    end
  end

  begin
    html_string = Maruku.new(markdown_temp).to_html   
    html_string.gsub!("<pre>","<pre class=\"prettyprint\">")
  rescue
    html_string = 'Post rendering failed, possibly due to an illegal charater'
  end
  return html_string
end


if $0 == __FILE__
 require 'pp'

 basic_md = "line1  \n[line2][]  \nline3  \nline4  \nline5  \n[line2]: http://google.co.uk"
 puts basic_md

 # All of basic_md
 puts
 puts maruku_html_snippet(basic_md, 7)
 
 puts
 puts maruku_html_snippet(basic_md, 3)


 tables_md = %{
mmm Tables
==

Col1 | Col2
 --|:--
 dat1|dat2

 }

 # All of basic_md
 puts
 puts maruku_html_snippet(tables_md)
 
 puts
 puts maruku_html_snippet(tables_md, 3)

 puts
 puts maruku_html_snippet(tables_md, 5)

end