static int gt_condenser_extract_runner(GT_UNUSED int argc,
                                  const char **argv,
                                  int parsed_args,
                                  void *tool_arguments,
                                  GtError *err)
{
  int had_err = 0;
  GtCondenserExtractArguments *arguments = tool_arguments;
  GtNREncseq *nre = NULL;
  GtEncseq *orig_encseq = NULL;
  GtEncseqLoader *esl;

  gt_error_check(err);
  gt_assert(arguments);

  /*load original encseq*/
  esl = gt_encseq_loader_new();
  orig_encseq = gt_encseq_loader_load(esl,
                                      gt_str_get(arguments->original),
                                      err);
  if (!orig_encseq) {
    had_err = -1;
  }
  gt_encseq_loader_delete(esl);
  if (!had_err) {
    nre = gt_n_r_encseq_new_from_file(argv[parsed_args], orig_encseq, err);
    if (nre == NULL) {
      had_err = -1;
    }
  }

  /*TODO get sequences by sequence ids: not yet implemented in n_r_encseq*/
  /*if (!had_err && arguments->range.start == GT_UNDEF_UWORD &&
       uedb != NULL) {
    GtUword idx,
            start = arguments->seqrange.start == GT_UNDEF_UWORD ?
                      0 :
                      arguments->seqrange.start,
            end = arguments->seqrange.end == GT_UNDEF_UWORD ?
                      uedb->nseq - 1 :
                      arguments->seqrange.end;
    for (idx = start; idx <= end && !had_err; idx++) {
      had_err = gt_unique_encseq_get_sequence_from_idx(idx, unique_encseq, uedb,
                                                       stdout, err);
    }
  }
  else if (!had_err) {*/
  if (!had_err) {
    GtNREncseqDecompressor *nred = gt_n_r_encseq_decompressor_new(nre);
    if (arguments->range.start == GT_UNDEF_ULONG &&
        arguments->range.end == GT_UNDEF_ULONG) {
      had_err = gt_n_r_encseq_decompressor_extract_origin_complete(stdout,
                                                                   nred,
                                                                   true,
                                                                   err);
    } else {
      had_err = gt_n_r_encseq_decompressor_extract_originrange(stdout,
                                                             nred,
                                                             &arguments->range,
                                                             false,
                                                             err);
    }
    gt_xfwrite_one("\n",stdout); /*TODO should better be in n_r_encseq.c?*/
    gt_n_r_encseq_decompressor_delete(nred);
  }
  gt_n_r_encseq_delete(nre);
  gt_encseq_delete(orig_encseq);
  return had_err;
}
static int gt_condenser_search_runner(GT_UNUSED int argc,
                                      GT_UNUSED const char **argv,
                                      GT_UNUSED int parsed_args,
                                      void *tool_arguments,
                                      GtError *err)
{
  GtCondenserSearchArguments *arguments = tool_arguments;
  int i, had_err = 0;
  char *querypath = gt_str_get(arguments->querypath);
  GtStr* coarse_fname = gt_str_new_cstr("coarse_");
  char *db_basename = NULL;
  char *suffix_ptr = NULL;
  GtTimer *timer = NULL;
  GtLogger *logger = NULL;

  gt_error_check(err);
  gt_assert(arguments);

  logger = gt_logger_new(arguments->verbose, GT_LOGGER_DEFLT_PREFIX, stderr);

  db_basename = gt_basename(gt_str_get(arguments->dbpath));
  /* if first char is '.' this might be a hidden file */
  if (strlen(db_basename) > (size_t) 1 &&
      (suffix_ptr = strrchr(db_basename + 1, '.')) != NULL) {
    /* remove suffix */
    *suffix_ptr = '\0';
  }
  gt_str_append_cstr(coarse_fname, db_basename);
  gt_str_append_cstr(coarse_fname, ".fas");
  gt_free(db_basename);
  db_basename = NULL;
  suffix_ptr = NULL;

  if (arguments->blastn || arguments->blastp) {
    GtMatch              *match;
    GtMatchIterator      *mp = NULL;
    GtNREncseq           *nrencseq = NULL;
    GtStr                *fastaname = gt_str_clone(arguments->dbpath);
    HitPosition          *hits;
    double                eval,
                          raw_eval = 0.0;
    GtUword               coarse_db_len = 0;
    GtMatchIteratorStatus status;
    int                   curr_hits = 0,
                          max_hits = 100;

    hits = gt_malloc(sizeof (*hits) * (size_t) max_hits);

    gt_str_append_cstr(fastaname, ".fas");

    for (i=0; i < max_hits; i++) {
      hits[i].range = gt_malloc(sizeof (*hits[i].range) * (size_t) 1);
    }

    if (gt_showtime_enabled()) {
      timer = gt_timer_new_with_progress_description("initialization");
      gt_timer_start(timer);
    }

    /*extract sequences from compressed database*/
    if (!had_err) {
      nrencseq = gt_n_r_encseq_new_from_file(gt_str_get(arguments->dbpath),
                                             logger, err);
      if (nrencseq == NULL)
        had_err = -1;
    }
    if (!had_err) {
      if (arguments->ceval == GT_UNDEF_DOUBLE ||
          arguments->feval == GT_UNDEF_DOUBLE) {
        /* from NCBI BLAST tutorial:
           E = Kmne^{-lambdaS}
           calculates E-value for score S with natural scale parameters K for
           search space size and lambda for the scoring system
           E = mn2^-S'
           m being the subject (total) length, n the length of ONE query
           calculates E-value for bit-score S'
         */
        GtFastaReader *reader;
        GtCondenserSearchAvg avg = {0,0};
        reader = gt_fasta_reader_rec_new(arguments->querypath);
        had_err = gt_fasta_reader_run(reader, NULL, NULL,
                                      gt_condenser_search_cum_moving_avg,
                                      &avg,
                                      err);
        if (!had_err) {
          GtUword S = arguments->bitscore;
          gt_log_log(GT_WU " queries, avg query size: " GT_WU,
                     avg.count, avg.avg);
          raw_eval = 1/pow(2.0, (double) S) * avg.avg;
          gt_logger_log(logger, "Raw E-value set to %.4e", raw_eval);
          gt_assert(avg.avg != 0);
        }
        gt_fasta_reader_delete(reader);
      }
    }

    /*create BLAST database from compressed database fasta file*/
    if (!had_err) {
      if (timer != NULL)
        gt_timer_show_progress(timer, "create coarse BLAST db", stderr);
      if (arguments->blastn)
        had_err = gt_condenser_search_create_nucl_blastdb(gt_str_get(fastaname),
                                                          err);
      else
        had_err = gt_condenser_search_create_prot_blastdb(gt_str_get(fastaname),
                                                          err);
    }

    if (!had_err) {
      GtBlastProcessCall *call;

      if (timer != NULL)
        gt_timer_show_progress(timer, "coarse BLAST run", stderr);

      if (arguments->blastp)
        call = gt_blast_process_call_new_prot();
      else
        call = gt_blast_process_call_new_nucl();
      gt_blast_process_call_set_db(call, gt_str_get(fastaname));
      gt_blast_process_call_set_query(call, querypath);
      gt_blast_process_call_set_evalue(call, arguments->ceval);
      gt_blast_process_call_set_num_threads(call, arguments->blthreads);

      mp = gt_match_iterator_blast_process_new(call, err);
      if (!mp)
        had_err = -1;

      gt_blast_process_call_delete(call);

      while (!had_err &&
             (status = gt_match_iterator_next(mp, &match, err)) !=
             GT_MATCHER_STATUS_END)
      {
        if (status == GT_MATCHER_STATUS_OK) {
          GtUword hit_seq_id;
          char string[7];
          const char *dbseqid = gt_match_get_seqid2(match);
          if (sscanf(dbseqid,"%6s" GT_WU, string, &hit_seq_id) == 2) {
            gt_match_get_range_seq2(match, hits[curr_hits].range);
            hits[curr_hits].idx = hit_seq_id;
            gt_match_delete(match);
            curr_hits++;
            if (curr_hits == max_hits) {
              HitPosition *hit_extention;
              max_hits += 100;
              hits = gt_realloc(hits, sizeof (*hit_extention) * max_hits);
              for (i=max_hits - 100; i < max_hits; i++) {
                hits[i].range = gt_malloc(sizeof (*hits[i].range));
              }
            }
          } else {
            gt_error_set(err, "could not parse unique db header %s", dbseqid);
            had_err = -1;
          }
        } else if (status == GT_MATCHER_STATUS_ERROR) {
          had_err = -1;
        }
      }
      gt_match_iterator_delete(mp);
    }
    /*extract sequences*/
    if (!had_err) {
      GtNREncseqDecompressor *decomp;
      GtFile *coarse_hits;
      if (timer != NULL)
        gt_timer_show_progress(timer, "extract coarse search hits", stderr);
      decomp = gt_n_r_encseq_decompressor_new(nrencseq);
      coarse_hits = gt_file_new(gt_str_get(coarse_fname),"w", err);
      /* TODO DW do NOT extract complete uniques! these could be complete
         chromosomes!! just extract something around it? maybe +- max query
         length*/
      for (i = 0; i < curr_hits; i++) {
        gt_n_r_encseq_decompressor_add_unique_idx_to_extract(decomp,
                                                             hits[i].idx);
      }
      had_err =
        gt_n_r_encseq_decompressor_start_unique_extraction(coarse_hits,
                                                           decomp,
                                                           &coarse_db_len,
                                                           err);
      gt_assert(coarse_db_len != 0);
      gt_file_delete(coarse_hits);
      gt_n_r_encseq_decompressor_delete(decomp);
    }
    gt_n_r_encseq_delete(nrencseq);

    /* create BLAST database from decompressed database file */
    if (!had_err) {
      if (timer != NULL)
        gt_timer_show_progress(timer, "create fine BLAST db", stderr);
      if (arguments->blastn)
        had_err =
          gt_condenser_search_create_nucl_blastdb(gt_str_get(coarse_fname),
                                                  err);
      else
        had_err =
          gt_condenser_search_create_prot_blastdb(gt_str_get(coarse_fname),
                                                  err);
    }
    /* perform fine BLAST search */
    if (!had_err) {
      GtBlastProcessCall *call;

      if (timer != NULL)
        gt_timer_show_progress(timer, "fine BLAST run", stderr);

      if (arguments->feval == GT_UNDEF_DOUBLE) {
        eval = raw_eval * coarse_db_len;
      } else {
        eval = arguments->feval;
      }

      if (arguments->blastp)
        call = gt_blast_process_call_new_prot();
      else
        call = gt_blast_process_call_new_nucl();

      gt_blast_process_call_set_db(call, gt_str_get(coarse_fname));
      gt_blast_process_call_set_query(call, querypath);
      gt_blast_process_call_set_evalue(call, eval);
      gt_blast_process_call_set_num_threads(call, arguments->blthreads);

      gt_logger_log(logger, "Fine E-value set to: %.4e (len)" GT_WU, eval,
                    coarse_db_len);

      mp = gt_match_iterator_blast_process_new(call, err);
      if (!mp)
        had_err = -1;

      gt_blast_process_call_delete(call);

      if (!had_err) {
        GtUword numofhits = 0;
        while (!had_err &&
               (status = gt_match_iterator_next(mp, &match, err)) !=
               GT_MATCHER_STATUS_END) {
          if (status == GT_MATCHER_STATUS_OK) {
            GtMatchBlast *matchb = (GtMatchBlast*) match;
            char *dbseqid = gt_malloc(sizeof (*dbseqid) * 50);
            GtRange range_seq1;
            GtRange range_seq2;
            numofhits++;
            gt_match_get_range_seq1(match, &range_seq1);
            gt_match_get_range_seq2(match, &range_seq2);
            gt_file_xprintf(
                    arguments->outfp,
                    "%s\t%s\t%.2f\t" GT_WU "\t" GT_WU "\t" GT_WU "\t" GT_WU "\t"
                    GT_WU "\t%g\t%.3f\n",
                    gt_match_get_seqid1(match),
                    gt_match_get_seqid2(match),
                    gt_match_blast_get_similarity(matchb),
                    gt_match_blast_get_align_length(matchb),
                    range_seq1.start,
                    range_seq1.end,
                    range_seq2.start,
                    range_seq2.end,
                    gt_match_blast_get_evalue(matchb),
                    (double) gt_match_blast_get_bitscore(matchb));
            gt_match_delete(match);
            gt_free(dbseqid);
          } else if (status == GT_MATCHER_STATUS_ERROR) {
            had_err = -1;
          }
        }
        gt_log_log(GT_WU " hits found\n", numofhits);
      }
      gt_match_iterator_delete(mp);

    }
    if (!had_err)
      if (timer != NULL)
        gt_timer_show_progress_final(timer, stderr);
    gt_timer_delete(timer);

    /*cleanup*/
    for (i=0; i < max_hits; i++) {
      gt_free(hits[i].range);
    }
    gt_free(hits);
    gt_str_delete(fastaname);
  }
  gt_str_delete(coarse_fname);
  gt_logger_delete(logger);
  return had_err;
}