anchor.diff:          cleanup = pkgs.writeText "cleanup" ''
             . ${./lib-bash/color-echo.sh}
   
  +          # A symbolic link whose target path matches this pattern will be
  +          # considered part of a Home Manager generation.
  +          homeFilePattern="$(readlink -e "${builtins.storeDir}")/*-home-manager-files/*"
  +
             newGenFiles="$1"
             shift 1
             for relativePath in "$@" ; do
               targetPath="$HOME/$relativePath"
               if [[ -e "$newGenFiles/$relativePath" ]] ; then
                 $VERBOSE_ECHO "Checking $targetPath: exists"
  -            elif [[ ! "$(readlink "$targetPath")" == ${homeFilePattern} ]] ; then
  +            elif [[ ! "$(readlink "$targetPath")" == $homeFilePattern ]] ; then
                 warnEcho "Path '$targetPath' not link into Home Manager generation. Skipping delete."
               else
                 $VERBOSE_ECHO "Checking $targetPath: gone (deleting)"
  
positive.code:       then file.source
        else builtins.path { path = file.source; name = sourceName; };
  
    # A symbolic link whose target path matches this pattern will be
    # considered part of a Home Manager generation.
    homeFilePattern = "${builtins.storeDir}/*-home-manager-files/*";
  
  in
  
  {
  
negative.code:         check = pkgs.writeText "check" ''
            . ${./lib-bash/color-echo.sh}
  
            # A symbolic link whose target path matches this pattern will be
            # considered part of a Home Manager generation.
            homeFilePattern="$(readlink -e "${builtins.storeDir}")/*-home-manager-files/*"
  
            newGenFiles="$1"
            shift
            for sourcePath in "$@" ; do
              relativePath="''${sourcePath#$newGenFiles/}"
              targetPath="$HOME/$relativePath"
              if [[ -e "$targetPath" \
                  && ! "$(readlink "$targetPath")" == $homeFilePattern ]] ; then
                if [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
                  backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
                  if [[ -e "$backup" ]]; then
  