http://nkuz2tpok7ctwd5ueer5bytj3bm42vp7lgjcsnznal3stotg6vyaakyd.onion/rbm_config.html
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. The function will receive as parameters
the project ’ s name, an options array reference, and the option that is
queried.