From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh workers <zsh-workers@zsh.org>
Subject: Re: Unexpected foo==bar errors
Date: Mon, 8 Feb 2016 10:45:28 -0800 [thread overview]
Message-ID: <160208104528.ZM12107@torch.brasslantern.com> (raw)
In-Reply-To: <CAHYJk3S-Vj24041msXn6f8w3DM1pbv2uooxHUF3F=Ou8od_PxQ@mail.gmail.com>
On Feb 8, 4:52am, Mikael Magnusson wrote:
}
} On Sun, Feb 7, 2016 at 8:16 PM, Bart Schaefer <schaefer@brasslantern.com> wrote:
} [...]
} > } _tar:70 is
} > } tf=${~words[3]}
} >
} > Ooh, that's a fun one: (foo) is being taken as glob qualifiers, which is
} > a larger problem in this case than the expansion of "=". Then because
} > globassign is off, the equals expansion (on the empty string) is done,
} > but the qualifiers are never applied to the result.
One potentially open question here is whether the value should be parsed
as a glob (qualifiers recognized) when no globbing is possible.
} > The only use of $tf as far as I can see is to do lookups in the cache.
}
} Presumably at some point the given filename has to be interpreted so
} that it can give any completions at all, even if it's not cached?
On closer inspection yes, I'm wrong about this, $tf is passed to "tar -tf"
to list the contents of the tar file even if not found in the cache.
} I wonder if there's anywhere in the completion system that depends on
} EQUALS being set... But maybe we should just 2> /dev/null the
} assignment since tilde expansion also prints errors. (_zattr and _zip
} also have this issue, presumably there are other places as well).
Redirecting error would still leave $tf empty. But there's no way to
cause process substitution [that is, <(...) >(...) and =(...) syntax]
to be applied to the result of parameter expansion, except by using
"eval" -- and of course globbing won't happen without GLOB_ASSIGN, so
the only reason for tf=${~words[3]} (and the other assignments in _tar
from lines 66-82) is to do tilde and equals expansion.
next prev parent reply other threads:[~2016-02-08 18:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-07 15:57 Mikael Magnusson
2016-02-07 19:06 ` Peter Stephenson
2016-02-08 7:09 ` Bart Schaefer
2016-02-08 9:49 ` Peter Stephenson
2016-02-07 19:16 ` Bart Schaefer
2016-02-08 3:52 ` Mikael Magnusson
2016-02-08 18:45 ` Bart Schaefer [this message]
2016-02-08 19:16 ` Mikael Magnusson
2016-02-14 20:10 ` Failed process substitution on x=$~y (Re: Unexpected foo==bar errors) Bart Schaefer
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