zsh-workers

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 #autoload
# disk device names on BSDs
local -a disks

case $OSTYPE in
  freebsd*)
    disks=( ${${(M)${(f)"$(geom disk list)"}\:#Geom name\:*}#*\: } )
  ;;
  dragonfly*)
    disks=( $(sysctl -n kern.disks) )
  ;;
  openbsd*)
    disks=( ${${(s.,.)"$(sysctl -n hw.disknames)"}%\:*} )
  ;;
  netbsd*)
    disks=( $(sysctl -n hw.disknames) )
  ;;
esac

if (( $#disks )); then
  local expl
  _wanted disk-devices expl 'disk device' compadd "$@" $disks
  return
fi

return 1