noms show should stream to stdout (#1456)

cmd/noms-show/noms_show.go

@@ -38,6 +38,7 @@ func main() {
 	database, value, err := spec.Value()
 	util.CheckError(err)
 
-	fmt.Println(types.EncodedValueWithTags(value))
+	types.WriteEncodedValueWithTags(os.Stdout, value)
+	fmt.Fprintf(os.Stdout, "\n")
 	database.Close()
 }

types/encode_human_readable.go

@@ -255,3 +255,9 @@ func EncodedValueWithTags(v Value) string {
 	w.WriteTagged(v)
 	return buf.String()
 }
+
+// WriteEncodedValueWithTags writes the serialization of a value prefixed by its type.
+func WriteEncodedValueWithTags(w io.Writer, v Value) {
+	hrs := &hrsWriter{w: w}
+	hrs.WriteTagged(v)
+}