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Re: !(.pattern) can match . and .. if dotglob is enabled

From: Nora Platiel
Subject: Re: !(.pattern) can match . and .. if dotglob is enabled
Date: Sun, 6 Jun 2021 17:18:28 +0200

In my previous message, I wrote:
> Yes, it all depends on the "universal set" from which the matches of the inner
> `pattern-list' are subtracted.
> But in the current implementation, the inner matches are subtracted from:
> - all files, if dotglob is set
> - all except dot files, if dotglob is unset

Sorry, I got mixed up here. From the above it would look like `.' and `..' are 
never excluded from the matches of `!()' if dotglob is set.
Actually they are normally excluded (which is fine), but they are included back 
again if at least one of the inner patterns starts with a literal dot.

From this sentence:
> !(pattern-list)
>    Matches anything except one of the given patterns.

currently the definition of "anything" is affected not only by the value of 
dotglob but also by the content of `pattern-list'.
I'm proposing that "anything" should be `*' (i.e. affected by dotglob but not 
by `pattern-list').

The usual dot treatment is applied to the inner patterns themselves but it 
doesn't make a difference in the final match.
E.g. the two patterns `!(.?)' and `!([.]?)' should have the same effect:
  `.?'   matches `..'
  `[.]?' doesn't match `..'
but `*' minus `.?' is still equal to `*' minus `[.]?', because `*' matches 
neither `.' nor `..' (and the final result should never include them).

My description of the desired behavior should still be sufficient.

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