From: Mark Somerville <mark@...>
Date: 2011-10-06T00:26:55+09:00
Subject: Re: Readline question - completely replace input?

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On Tue, Oct 04, 2011 at 10:07:52PM +0900, Marc Heiler wrote:
> Hi.
>=20
> This is a strange question perhaps ...
>=20
> I use Readline.readline to fetch user input.
>=20
> Now if the user types:
>=20
>=20
> "abc"
>=20
> And then presses tab, I want this to complete to:
>=20
> "do_action foobar"
>=20
> So, yes, the original input "abc" no longer has anything to do with the
> end result. :)
>=20
> Is this possible? So far I am using Readline only to do something like:
>=20
>=20
> "do<TAB>"
>=20
> expand into
>=20
> "do_action "
>=20
> But it would be kind of neat to both append something specifically after
> TAB was pressed, and to also completely change the original input at the
> same time.

This is certainly possible using rb-readline[1] (pure Ruby port of GNU
Readline), but I doubt that the C binding to GNU Readline provides
enough hooks.

As a rough starting point, you could look at rl_bind_key() to redefine
the behaviour of \t. Some methods and variables to look at are:

  rl_insert()
  rl_redisplay()
  @_rl_last_v_pos
  @rl_point
  @rl_done

1 - https://github.com/luislavena/rb-readline

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