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#compdef -k complete-word \C-xh

_complete_help() {
  local _sort_tags=_help_sort_tags text i j
  typeset -A help_funcs help_tags

  compadd() { return 1 }

  _main_complete

  unfunction compadd

  for i in "${(@k)help_funcs}"; do
    text="${text}
tags in context :completion:${i}:"
    for j in "${(@s.:.)help_funcs[$i][2,-1]}"; do
      text="${text}${help_tags[${i}${j}]}	(${j})"
    done
  done

  compstate[list]='list force'
  compstate[insert]=''

  compadd -UX "$text[2,-1]" -n ''
}

_help_sort_tags() {
  local f="${${${funcstack[3,(i)_(main_complete|complete|approximate|normal)]}% *}#_(wanted|requested) }"
  if [[ "$help_funcs[$curcontext]" != *${f}* ]]; then
    help_funcs[$curcontext]="${help_funcs[$curcontext]}:${f}"
    help_tags[${curcontext}${f}]="${help_tags[$curcontext]}
      ${argv}"
    comptry "$@"
  fi
}

_complete_help "$@"