anchor.diff:  
   % gunzip
   deftask gunzip( out( File ) : gz( File ) )in bash *{
  +  out=unzipped_${gz%.gz}
     gzip -c -d $gz > $out
   }*
   
  
positive.code: fun exonicfun = annovar(
    vcf:      vcf,
    db:       db,
    buildver: 'hg38' );
  
  
  %% ============================================================
  
negative.code: deftask bowtie2-build( idx( File ) : fa( File ) )
  in bash *{
    bowtie2-build $fa bt2idx
    idx=idx.tar
    tar cf $idx --remove-files bt2idx.*
  }*
  
  