bug#16577: Add regexp-based version of completion-ignored-extensions

[Lars Ingebrigtsen <larsi@gnus.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> I haven't looked at the various code snippets that use the resulting
>> regexps, but I imagine that some are matching on the full file name and
>> some aren't?
>
> I think the important case only has the nondirectory part of the file
> name at hand, which is why I propose for "/<RE>" to be defined as
> matching only on that part (with a terminating / if it's a directory).

Oh, so this wouldn't be a plain regexp, but a ... mini-language where
"/" has a special meaning?  I think that sounds pretty confusing.

> No, the "/" would look like it's matching the / of a full file name, but
> it would really be just a marker to indicate that the rest is a regexp
> (and where it's anchored) and the matching code would extract the regexp
> from it (and replace it with the equivalent of \\(?:\\`\\|/\\) as
> needed).

Hm.  I think it'd a more straightforward interface to just keep regexps
out of it all, but I see the attraction of having a regexp interface,
too.

-- 
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