html2text function in Ruby

Whilst adding text-email feature in RssFwd (Ruby on Rails app), I had some problems looking for a html2text ruby library that’ll do what I need - simple, clear text output, so I wrote my own.

So, in case somebody else is looking for this little function (but irritating to be missing) here’s my shot at getting a similar-to-lynx-dump kind of output:

The code:

require ‘cgi’

def html2text html
  text = html.
    gsub(/( |\n|\s)+/im, ’ ‘).squeeze(’ ‘).strip.
    gsub(/<([^\s]+)[^>]*(src|href)=\s*(.?)([^>\s]*)\3[^>]*>\4<\/\1>/i, ‘\4’)

  links = []
  linkregex = /<[^>]*(src|href)=\s*(.?)([^>\s]*)\2[^>]*>\s*/i
  while linkregex.match(text)
    links << $~[3]
    text.sub!(linkregex, "[#{links.size}]")
  end

  text = CGI.unescapeHTML(
    text.
      gsub(/<(script|style)[^>]*>.*<\/\1>/im, ”).
      gsub(/<!–.*–>/m, ”).
      gsub(/<hr(| [^>]*)>/i, "___\n").
      gsub(/<li(| [^>]*)>/i, "\n* ").
      gsub(/<blockquote(| [^>]*)>/i, ‘> ‘).
      gsub(/<(br)(| [^>]*)>/i, "\n").
      gsub(/<(\/h[\d]+|p)(| [^>]*)>/i, "\n\n").
      gsub(/<[^>]*>/, ”)
  ).lstrip.gsub(/\n[ ]+/, "\n") + "\n"

  for i in (0…links.size).to_a
    text = text + "\n  [#{i+1}] <#{CGI.unescapeHTML(links[i])}>" unless links[i].nil?
  end
  links = nil
  text
end


Sample html input string:

<h1>Title</h1>
This is the body. Testing <a href="http://www.google.com/">link to Google</a>.<p />
Testing image <img src="/noimage.png">.<br />
The End.


The generated output string:

Title

This is the body. Testing [1]link to Google.

Testing image [2].
The End.

  [1] <http://www.google.com/>
  [2] </noimage.png>


Comments are welcome.

Note:

  1. The <> around the list of links at the bottom? they supposedly helps more arcanic e-mail programs understand that they should not be broken up into multiple lines.

  2. The HTML entities aren’t fully converted by CGI.unescapeHTML(e.g. &mdash;) if there’s a better method to use, lemme know