Simple ruby function to prevent widows in a piece of HTML

gistfile1.rb

# Simple widow prevention in ruby
# given a piece of HTML (not just text) this will look for ending
# tags to common block-level elements that should not have widows
#
# This can be used as a TextMate command -- I've got it mapped
# to option-w. Simply put this in there, working on selected text or entire
# document.

def widont(text)
  tags = %w{li p div dt dd legend label h1 h2 h3 h4 h5 h6}.join('|')
  text.gsub(/(<(?:#{tags}).*?>.*?)([^\s]+)\s+([^\s]+)\s*(?=<\/(?:#{tags})>|<br ?\/?>)/, '\1\2&nbsp;\3')
end

# In a texmate command:
# print widont(STDIN.read)