zsh-workers

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 #compdef renice

if [[ $CURRENT = 2 ]]; then
  _message -e priority
else
  local opts ret=1
  opts=(
    '-g:interpret args as process group IDs'
    '-u:interpret args as user names'
    '-p:interpret args as process IDs'
  )
  _describe -o option opts && ret=0

  case ${(v)words[(I)-?]} in
    -g) _message -e pgids 'process group ID' && ret=0 ;;
    -u) _users && ret=0 ;;
    *)  _pids && ret=0;;
  esac
fi

return ret