Function arg_input::argf

pub fn argf() -> Result<Box<Read>, InputError>

Act like input(), but automatically pull arguments from the command line.

Assumes that the command line arguments are undisturbed (i.e., the first argument is the executable name) and that all other arguments should be treated like file names. If this is not the case and you need more fine-grained control (e.g. you're using docopt to parse command-line arguments instead), use input().