Convert Trac wiki syntax to Markdown

trac2md.rb

#!/usr/bin/env ruby
# Based on: https://gist.github.com/619537

body = STDIN.read

body.gsub!(/\{\{\{([^\n]+?)\}\}\}/, '`\1`')
body.gsub!(/\{\{\{(.+?)\}\}\}/m){|m| m.each_line.map{|x| "\t#{x}".gsub(/[\{\}]{3}/,'')}.join}
body.gsub!(/\=\=\=\=\s(.+?)\s\=\=\=\=/, '### \1')
body.gsub!(/\=\=\=\s(.+?)\s\=\=\=/, '## \1')
body.gsub!(/\=\=\s(.+?)\s\=\=/, '# \1')
body.gsub!(/\=\s(.+?)\s\=[\s\n]*/, '')
body.gsub!(/\[(http[^\s\[\]]+)\s([^\[\]]+)\]/, '[\2](\1)')
body.gsub!(/\!(([A-Z][a-z0-9]+){2,})/, '\1')
body.gsub!(/'''(.+)'''/, '*\1*')
body.gsub!(/''(.+)''/, '_\1_')
body.gsub!(/^\s\*/, '*')
body.gsub!(/^\s\d\./, '1.')

STDOUT.write(body)