adds new tsv writer

Signed-off-by: someshkoli <[email protected]>

cmd/thanos/tools_bucket.go

@@ -9,6 +9,7 @@ import (
 	"encoding/csv"
 	"encoding/json"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"os"
@@ -664,18 +665,23 @@ func printCSV(t Table) error {
 	return nil
 }
 
+func newTSVWriter(w io.Writer) *csv.Writer {
+	writer := csv.NewWriter(w)
+	writer.Comma = '\t'
+	return writer
+}
+
 func printTSV(t Table) error {
-	csv := csv.NewWriter(os.Stdout)
-	csv.Comma = '\t'
-	err := csv.Write(t.Header)
+	tsv := newTSVWriter(os.Stdout)
+	err := tsv.Write(t.Header)
 	if err != nil {
 		return err
 	}
-	err = csv.WriteAll(t.Lines)
+	err = tsv.WriteAll(t.Lines)
 	if err != nil {
 		return err
 	}
-	csv.Flush()
+	tsv.Flush()
 	return nil
 }