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To: zsh-users@zsh.org
From: Martin Vaeth <martin@mvath.de>
Subject: Re: How to disable certain completion tags?
Date: Thu, 16 Feb 2017 21:54:08 +0000 (UTC)
Message-ID: <slrnoac7s7.4nd.martin@lounge.imp.fu-berlin.de>
References: <slrnoaauqi.5s3.martin@lounge.imp.fu-berlin.de>
 <CAHYJk3QTXgr4Z85z4gdX+Ez32NtrNg3zj04P8W3qC_Y8yC+4zg@mail.gmail.com>
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Mikael Magnusson <mikachu@gmail.com> wrote:
> Martin Vaeth <martin@mvath.de> wrote:
>>
>> zstyle ':completion:*:*:dummy:*' tag-order ''
>>
>> [...] does not show any effect.
>
> Does this help?
>
>               -      If any value consists of only a  hyphen [...]

Thanks for the reply. But this is not exactly what I intended:

zstyle ':completion:*:*:dummy:*' tag-order -

switches off completion completely for "dummy" (in particular, also
"dummy --f<tab>" is not being completed to "dummy --foo="); I only
want to switch off completion for the tag "foo" (in the example after
"dummy --foo=<tab>").
None of my alternative attempts like (actually I had tried many more)

zstyle ':completion:*:*:dummy:*' tag-order '- ! foo'
zstyle ':completion:*:*:dummy:*' tag-order - '!' foo
zstyle ':completion:*:*:dummy:*' tag-order - '!foo'
zstyle ':completion:*:*:dummy:*' tag-order '- !foo'
zstyle ':completion:*:*:dummy:*' tag-order '!foo'
zstyle ':completion:*:*:dummy:*' tag-order '!' foo

seems to have any effect, either.