zshlibs/tools/zshlibs_update

function zshlibs_update()
{
  autoload zshlibs_log
  zshlibs_log zlibs_update "preparing self update …"
  if [[ -n "$zshlibs_install" ]] 
  then
    zshlibs_log zlibs_update "cd into '$zshlibs_install' …"
    pushd $zshlibs_install 2>&1 > /dev/null
    zshlibs_log zlibs_update "git pull …"
    (
    git pull 2>&1 |zshlibs_log zlibs_update &
    )
    zshlibs_log zlibs_update "update done"
    popd 2>&1 > /dev/null
  else
    echo '$zshlibs_install not set!'
    return 1
    zlibs_install
  fi
}