Convert Trac Wiki to Markdown

convert_trac.rb

#!/usr/bin/env ruby

# Convert Trac DB Wiki pages to Markdown source files

# This script is based on http://github.com/seven1m/trac_wiki_to_github which
# converted all pages from a Trac DB to GitHub Wiki format (as Textile).
#
# I made two changes:
# - uses MarkDown format instead
# - uses the sqllite3-ruby gem which does not need Ruby 1.9
#

TRAC_DB_PATH = 'trac.db'
OUT_PATH = 'wiki'
GITHUB_WIKI_URL = '/somebox/myproject/wikis/'

require 'rubygems'
gem 'sqlite3-ruby'
require 'sqlite3'

db = SQLite3::Database.new(TRAC_DB_PATH)
pages = db.execute('select name, text from wiki w2 where version = (select max(version) from wiki where name = w2.name);')

pages.each do |title, body|
  File.open(File.join(OUT_PATH, title.gsub(/\s/, '')+'.md'), 'w') do |file|
    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.')
    file.write(body)
  end
end

I just wanted in a script [no access to the DB]:

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

    gsub!(/\{\{\{([^\n]+?)\}\}\}/, '`\1`')
    gsub!(/'''(.+?)'''/, '**\1**')
    gsub!(/''(.+?)''/, '*\1*')
    gsub!(/((^\|\|[^\n\r]+\|\|[ \t]*\r?(\n|$))+)/m) do |m|
      m = m.each_line.map do |x|
        x.gsub(/\t/, ' ')
          .gsub(/(\|\|){2,}/){|k| k.gsub(/\|\|/, '||   ')}
        .gsub(/ {3,}/, '   ')
      end.join
      lines = m.each_line.to_a
      line1 = lines.shift
      line2 = line1.dup.gsub(/[^\n\r\|]/, '-')
      lines.unshift(line1, line2)
      c = lines.join
      c = c.each_line.map do |x|
        x.gsub(/\=\s?(.+?)\s?=/, ' \1 ')
          .gsub(/\|\|/, '|')
      end.join
    end
    gsub!(/^\{\{\{(.+?)^\}\}\}/m, '```\1```')
    gsub!(/\=\=\=\=\s(.+?)\s\=\=\=\=/, '### \1')
    gsub!(/\=\=\=\s(.+?)\s\=\=\=/, '## \1')
    gsub!(/\=\=\s(.+?)\s\=\=/, '# \1')
    gsub!(/\=\s(.+?)\s\=[\s\n]*/, '')
    gsub!(/\[(http[^\s\[\]]+)\s([^\[\]]+)\]/, '[\2](\1)')
    gsub!(/\!(([A-Z][a-z0-9]+){2,})/, '\1')
    gsub!(/^\s\*/, '*')
    gsub!(/^\s\d\./, '1.')
  end
end

some_trac = 'my document'

puts some_trac.trac_to_markdown!

I'm trying to convert Trac milestone description to migrate to GitHub via REST API.

The conversion went well but I can't put the resulting string into json to send to rest API - unprocessable entity. How do I escapify the result?