Add capacity to obidistribute to save gzipped files

pkg/obiformats/dispatcher.go

@@ -2,6 +2,7 @@ package obiformats
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 
 	log "github.com/sirupsen/logrus"
@@ -22,6 +23,7 @@ func WriterDispatcher(prototypename string,
 	jobDone.Add(1)
 
 	go func() {
+		opt := MakeOptions(options)
 		for newflux := range dispatcher.News() {
 			jobDone.Add(1)
 			go func(newflux int) {
@@ -31,8 +33,13 @@ func WriterDispatcher(prototypename string,
 					log.Fatalf("Cannot retreive the new chanel : %v", err)
 				}
 
+				name:=fmt.Sprintf(prototypename, dispatcher.Classifier().Value(newflux))
+				if opt.CompressedFile() && ! strings.HasSuffix(name,".gz") {
+					name = name + ".gz"
+				}
+				
 				out, err := formater(data,
-					fmt.Sprintf(prototypename, dispatcher.Classifier().Value(newflux)),
+					name,
 					options...)
 
 				if err != nil {