failFunction option so you can not fail on broken folder functions.optOrEnvVar first looks up a name’s value first as a option, then as an environment variable if the option value is unset or empty (string or vector).setff invocation can take several forms, and more extensive variable search can be performed; name for accessor function can be interpreted as name to lookup exactly, as uppercase, or as lowercase according to optOrEnvVar.setff is now called path rather than location.This is the initial package release.
setff function establishes a variable accessor function.listff function lists available variable accessor functions.