Zsh Mailing List Archive
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Re: problem with context specification
Pier Paolo Grassi wrote on Tue, 14 Jan 2020 15:59 +00:00:
> to answer Daniel:
> > I take it the documentation of zstyle didn't make this clear, so could you
> > suggest how to improve it?
> It's not clear to me what is the meaning of the various "sections"of the
> pattern (the segments delimited by the colons)
This, too, is explained in the manual (see zshcompsys(1), or online):
The context string always consists of a fixed set of fields, separated
by colons and with a leading colon before the first. Fields which are
not yet known are left empty, but the surrounding colons appear anyway.
The fields are always in the order
:completion:function:completer:command:argument:tag. These have the
> what should I put in the first section?
":completion:", literally. That's hard-coded. See the patch I posted
for another example, and Misc/vcs_info-examples in the source
> is there a list of possible values and relative meaning?
The manual does list the available completers and many tags and styles (the style
is, e.g., "matcher-list" in your example), but it's possible some commands use custom
ones. Ctrl+X h is the standard recommendation for discovering these.
> and so on for each section
> why the number of sections is not the same for every pattern?
Because asterisks can match colons. The number of sections in the
context _that is looked up_ (with zstyle -s/-t/-T/-b/-a) is always the
same. There's an example in the patch I posted.
> How can I know how many pattern I should put in?
One pattern per zstyle command in your zshrc.
If you mean how many colon-separated parts, that's up to you. It's
basically a matter of coding style unless you set the same style in
multiple contexts, in which case the colons directly affect precedence,
as explained in the portion of the docs I quoted in my first answer
(though in retrospect I'm not sure now if that was what you were asking
> I assume the stars are for matching every possible value for that segment,
No. An asterisk matches zero or more characters, _including colons_.
(My patch said that explicitly.)
> are there other globbing operators available?
Yes, anything that works in «case $haystack in ‹needle›) …;; esac», or
equivalently in «[[ ‹haystack› == ‹needle› ]]», can be used in zstyle settings.
> can I use them for prefix/suffix matching? (eg someth* for
> something etc)
Yes, you could:
% zstyle 'foob*' key value
% zstyle -s foobar key REPLY
% typeset -p REPLY
For example, I set:
zstyle ':completion:*:*:git-*:*:hosts' ignored-patterns localhost ip6-localhost ip6-loopback
and the style applies to git-push(1), git-pull(1), git-ls-remote(1), etc..
> Not that I think it would be particularly useful, but the question
> came to mind I assume also that the stars don't match multiple
> segments, but this doesn't seem to be stated in the docs.
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