Extensible tab-completion?

[Lloyd Williams <binary_frog@chatcircuit.com>]

Are there any objections/suggestions to providing an interface for
scripts and plugins to extend the tab-completion in their own ways?

One such interface may be a new signal, emitted when the user hits the
key binded to the "Complete nick/command" action. Handlers could be
passed the full content of the input line with the current position of
the cursor within that line, along with a list of so-far results to
which they are allowed to append/remove/etc. results.

This would allow, for example, a script to add file name completion to
the `<file>' argument of /DCC SEND. Or another script which maintains
an internal list of channel bans to auto-complete for the parameters
of /UNBAN.

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