class Rouge::Lexer

def find_fancy(str, code=nil, additional_options={})


markdown lexer for highlighting internal code blocks.
This is used in the Redcarpet plugin as well as Rouge's own

Lexer.find_fancy('guess', "#!/bin/bash\necho Hello, world")

and you can pass a second argument of the code to guess by
* You can pass the special name 'guess' so we guess for you,

Lexer.find_fancy('erb?parent=tex')

* The string you pass can include CGI-style options

Find a lexer, with fancy shiny features. 
def find_fancy(str, code=nil, additional_options={})
  if str && !str.include?('?') && str != 'guess'
    lexer_class = find(str)
    return lexer_class && lexer_class.new(additional_options)
  end
  name, opts = str ? str.split('?', 2) : [nil, '']
  # parse the options hash from a cgi-style string
  opts = CGI.parse(opts || '').map do |k, vals|
    val = case vals.size
    when 0 then true
    when 1 then vals[0]
    else vals
    end
    [ k.to_s, val ]
  end
  opts = additional_options.merge(Hash[opts])
  lexer_class = case name
  when 'guess', nil
    self.guess(:source => code, :mimetype => opts['mimetype'])
  when String
    self.find(name)
  end
  lexer_class && lexer_class.new(opts)
end