What will give me something like ruby readline with a default value?

If I want to have a prompt on the terminal with a default value already typed in, how can I do that?

Ruby's standard Readline.readline() lets me set the history but not fill in a default value (as far as I can tell, at least)

I would like something like this:

code:

input = Readline.readline_with_default('>', 'default_text')

console:

> default_text|