Add a user hook to be executed before launching an R subprocess

This function allows users of callr to specify functions that get invoked whenever an R session is launched. The function can modify the environment variables and command line arguments.

Usage

add_hook(...)

Arguments

...

Named argument specifying a hook function to add, or NULL to delete the named hook.

Value

add_hook is called for its side-effects.

Details

The prototype of the hook function is function (options), and it is expected to return the modified options.