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name : _extensions

 #autoload

# This completer completes filename extensions when completing
# after *. or ^*. It can be used anywhere in the completer list
# but if used after _expand, patterns that already match a file
# will be expanded before it is called.

compset -P '(#b)([~$][^/]#/|)(*/|)(\^|)\*.' || return 1

local -aU files
local -a expl suf mfiles

files=( ${(e)~match[1]}${match[2]}*.* ) || return 1
eval set -A files '${(MSI:'{1..${#${(O)files//[^.]/}[1]}}':)files%%.[^/]##}'
files=( ${files:#.<->(.*|)} )

if zstyle -t ":completion:${curcontext}:extensions" prefix-hidden; then
  files=( ${files#.} )
else
  PREFIX=".$PREFIX"
  IPREFIX="${IPREFIX%.}"
fi

zstyle -T ":completion:${curcontext}:extensions" add-space ||
  suf=( -S '' )

_description extensions expl 'file extension'

# for an exact match, fail so as to give _expand or _match a chance.
compadd -O mfiles "$expl[@]" -a files
[[ $#mfiles -gt 1 || ${mfiles[1]} != $PREFIX ]] &&
    compadd "$expl[@]" "$suf[@]" -a files &&
    [[ -z $compstate[exact_string] ]]

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