Takes an url, detects its params and adds to it the vars from the hash

add_url_vars.rb

# Takes an url, detects its params and adds to it the vars from the hash
# Example of use:
# > add_url_vars("http://www.example.com/signup?token=HIWORLD", {:s => 'HIAGAIN', :s32 => 'BYE'})
# => "http://www.example.com/signup?token=HIWORLD&s=HIAGAIN&s32=BYE" 
def add_url_vars(url, vars={})
  uri = URI.parse(url)
  pre_vars = get_url_vars(url)
  vars_total = []
  for var in pre_vars
    vars_total << "#{var[0]}=#{var[1][0]}"
  end
  for var in vars
    vars_total << "#{var[0]}=#{var[1]}"
  end
  return "#{uri.scheme}://#{uri.host}#{uri.path}?#{vars_total.join('&')}"
end