pub fn shown(
defs: &Menus,
number: u32,
first: usize,
variables: Option<&[Variable]>,
) -> Option<Vec<Option<ShownKey>>>Expand description
The six keys of menu number on the page starting at key first:
from the definition in defs, or for the VAR menu from variables
(the current directory’s, newest first). None where the keys are
not known.