http://nkuz2tpok7ctwd5ueer5bytj3bm42vp7lgjcsnznal3stotg6vyaakyd.onion/rbm_config.html
Note that the perl code block needs to be indented with at least one space. An interesting benefit of writting options in perl is that you can
define some options using a perl function reference. If the value of an
option is a function reference, then when that option is looked up the
function will be executed, and the value of the option will be the
return value of the function.