Simplify the workers code by removing dupplicates

Former-commit-id: 638fcf8d88dd93755d1ec89c8fe92f6ed3f733df

pkg/obitools/obiconvert/sequence_writer.go

@@ -1,6 +1,8 @@
 package obiconvert
 
 import (
+	"io/fs"
+	"os"
 	"path/filepath"
 	"strings"
 
@@ -93,6 +95,15 @@ func CLIWriteBioSequences(iterator obiiter.IBioSequence,
 			newIter, err = obiformats.WriteSequencesToFile(iterator, fn, opts...)
 		}
 	} else {
+		log.Info("Output is done on stdout")
+		var s fs.FileInfo
+		s, err = os.Stdout.Stat()
+		if err != nil {
+			return obiiter.NilIBioSequence, err
+		}
+
+		log.Infof("Data is writen to %s", s.Name())
+
 		opts = append(opts, obiformats.OptionsSkipEmptySequence(CLISkipEmpty()))
 		switch CLIOutputFormat() {
 		case "fastq":

pkg/obitools/obipcr/pcr.go

@@ -60,5 +60,5 @@ func CLIPCR(iterator obiiter.IBioSequence) (obiiter.IBioSequence, error) {
 		iterator = iterator.Pipe(frags)
 	}
 
-	return iterator.MakeISliceWorker(worker, false, obioptions.CLIParallelWorkers(), 0), nil
+	return iterator.MakeISliceWorker(worker, false, obioptions.CLIParallelWorkers()), nil
 }

pkg/obitools/obitag/obitag.go

@@ -293,7 +293,9 @@ func CLIAssignTaxonomy(iterator obiiter.IBioSequence,
 		if err == nil {
 			j++
 		} else {
-			log.Warnf("Taxid %d is not described in the taxonomy. Sequence %s is discared from the reference database", seq.Taxid(), seq.Id())
+			log.Warnf("Taxid %d is not described in the taxonomy."+
+				      " Sequence %s is discared from the reference database", 
+					  seq.Taxid(), seq.Id())
 		}
 	}