trait Filter extends AnyRef
The way you configure your terminal behavior; a trivial wrapper around a
function, though you should provide a good .toString
method to make
debugging easier. The TermInfo and TermAction types are its
interface to the terminal.
Filters are composed sequentially: if a filter returns None
the next
filter is tried, while if a filter returns Some
that ends the cascade.
While your op
function interacts with the terminal purely through
immutable case classes, the Filter itself is free to maintain its own state
and mutate it whenever, even when returning None
to continue the cascade.
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the
.toString
of this object, except by making it separate we force the implementer to provide something and stop them from accidentally leaving it as the meaningless default. - abstract def op(ti: TermInfo): Option[TermAction]
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