#compdef uptime guptime

local variant

_pick_variant -r variant procps=procps gnu='Free Soft' unix --version

case $variant in
  procps)
    _arguments -s -S : \
      '(: -)'{-h,--help}'[display help information]' \
      '(: -)'{-V,--version}'[display version information]' \
      + '(excl)' \
      {-p,--pretty}'[display uptime in pretty format]' \
      {-s,--since}'[display date/time of system boot]'
    return
    ;;
  gnu)
    _arguments -S : \
      '(: -)--help[display help information]' \
      '(: -)--version[display version information]' \
      '1:utmp/wtmp file:_files'
    return
    ;;
  # *BSD, Darwin, Solaris, BusyBox
  *) _message 'no more arguments'; return 1 ;;
esac