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Date: Wed, 06 Nov 2013 23:30:02 -0700
From: John <jmharres@gmail.com>
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To: zsh-users@zsh.org
Subject: Re: ordering of file-patterns completions
References: <527A5F11.2080701@gmail.com> <131106080319.ZM19160@torch.brasslantern.com>	<527AE8BF.6090706@gmail.com> <131106201745.ZM20201@torch.brasslantern.com>
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On 11/6/13, 9:17 PM, Bart Schaefer wrote:
> On Nov 6,  6:11pm, John wrote:
> }
> } > doesn't quite generalize if there may be options (words starting with
> } > a hyphen) between the command name and the first file.  If that is the
> } > case, you'll need to do some pre-processing of $words before calling
> } > _arguments to determine which position to reference instead of [2].
> }
> } Yeah, unfortunately I do.  I was using _arguments to process those, and
> } then zstyle to deal with the files.  But I'm not quite understanding how
> } to do what you're describing to pre-process them instead of using
> } _arguments.
>
> How complicated this needs to be depends on what might appear in the
> words preceding the first file.
>
> If there's nothing but options, for example, then you can probably do:
>
>    local first_file=$(( ${words[(I)-*]} + 1 ))
>
> which says to start from the end of the array and look backward to
> find the index of the first word that DOES start with a hyphen, and
> then add one to it.  Or, if there might be file names that start with
> hyphen, then:
>
>    local first_file=$(( ${${words[2,-1]}[(i)[^-]*]} + 1 ))
>
> which says "in the array formed by the second through last elements of
> the words array, report the index of the first element that does not
> begin with a hyphen" and then add one to compensate for starting at 2.
>
The first one nearly does it, but seems to be confused when there are no 
options at all.  That is, it works fine as long as there is a --opt1, 
but if there isn't, the *: portion says it's completing the right thing, 
but then lists all the files rather than the matching one:

% yes <tab>XXX.<tab>
Completing XXX file
XXX.0       XXX.bogus   XXX.bogus3
XXX.1       XXX.bogus2  XXX.bogus4

% yes --opt1 XXX.0 <tab>XXX-YYY.0

% yes XXX.0 XXX<tab>
Completing XXX extra files
XXX-YYY.0   XXX.0       XXX.bogus XXX.bogus3
XXX-YYY.1   XXX.1       XXX.bogus2  XXX.bogus4

This is with:

#compdef yes

local first_file=$(( ${words[(I)--*]} + 1 ))

_arguments \
         '--opt1[desc1]' \
         '--opt2[desc2]' \
         '1:XXX file:_files -g "*XXX.*"' \
         '*:XXX extra files:_files -g "*XXX-*.${words[first_file]:e}"'

I ended up adding:

if [[ $first_file -lt 2 ]]; then
         first_file=2
fi

And that fixed it.  Not realizing that the array was 1-based threw me 
for a bit.  I also changed the :x to a :e, as :x just gave me an error, 
and :e matched the description of what I think you had meant.

Thanks!
John