Returns a default prompt value.

** READLINE COMPATIBILITY ** //.

** READLINE COMPATIBILITY ** //.

** READLINE COMPATIBILITY ** //.

The standard input/output abstraction - designed to mirror standard systems.

Options for integrations with readline.

Implements a line history that stores NOTHING.

An Editor is capable of displaying and updating a value.

LineHistory manages a collection of commands that have historically been entered.

A shell runs scripts on the host machine.

Assign is a function that that accepts the value of the line as input - performing some environment side-effect, e.g.

Valid accepts the current user data, returning an error.

Complete accepts the current value of the line and returns a list of possible completions.

Failure is a standard failure handler.

A file editor calls out to the system to open.

Info accepts the current user input and returns a value that is informative or instructive to the user.

Matcher matches a string.