anchor.diff:  
       home.activation.linkGeneration = dagEntryAfter ["writeBoundary"] (
         let
  +        pattern = "-home-manager-files/";
  +
           link = pkgs.writeText "link" ''
             newGenFiles="$1"
             shift
  
positive.code:             targetPath="$HOME/$relativePath"
              if [[ -e "$newGenFiles/$relativePath" ]] ; then
                $VERBOSE_ECHO "Checking $targetPath  exists"
              else
                echo "Checking $targetPath  gone (deleting)"
                $DRY_RUN_CMD rm $VERBOSE_ARG "$targetPath"
  
negative.code:         '';
  
          cleanup = pkgs.writeText "cleanup" ''
            . ${./lib-bash/color-echo.sh}
  
            newGenFiles="$1"
            oldGenFiles="$2"
            shift 2
  