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context for globbing qualifiers based on command

Hi there,

unfortunately I'm not too well familiar with the syntax of zstyle and
setting appropriate contexts to achieve the following (although there
were quite some nice examples on this list now and then).

Suppose there is a function foo which we can use as a globbing qualifier
a la
  print -l *(e:foo)
maybe even such that it takes an argument
  print -l *(e:foo 5)

Is it possible to tweak the completion such that shell functions are
grouped at the top when pressing TAB when using (:e...) on a given command?
  print -l *(e:TAB --> gives a lot of possible functions etc
  special_command *(e:TAB
gives only shell function matching some regexp or gives only the single
function 'foo' or members of an array of functions?


PS: Just in case it is not clear what I mean by the above, here the
example I need it for: special_command needs filenames as arguments in
which two numbers appear. I now want to use only those files in which
the numbers have a certain sum (one could also think of product or

So there are shell functions (aka the above `foo')
and I want
  special_command file_<->_<->.dat*(:TAB
to give only sum_equals and product_equals (or at least group them
together and show them at the top)

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