[logdog/common/types] make StreamAddr implement flag.Value.

logdog/common/types/streamaddr.go

Index: logdog/common/types/streamaddr.go
diff --git a/logdog/common/types/streamaddr.go b/logdog/common/types/streamaddr.go
index 53d1018e4ee2f6f1f6fc59512a1aebdb32b70039..ac17da1f9bd8ae94219f9efe2c1bf965aa6f22ee 100644
--- a/logdog/common/types/streamaddr.go
+++ b/logdog/common/types/streamaddr.go
@@ -5,6 +5,7 @@
 package types
 
 import (
+	"flag"
 	"net/url"
 	"strings"
 
@@ -26,6 +27,18 @@ type StreamAddr struct {
 	Path StreamPath
 }
 
+var _ flag.Value = (*StreamAddr)(nil)
+
+// Set implements flag.Value
+func (s *StreamAddr) Set(v string) error {
+	a, err := ParseURL(v)
+	if err != nil {
+		return err
+	}
+	*s = *a
+	return nil
+}
+
 // String returns a string representation of this address.
 func (s *StreamAddr) String() string { return s.URL().String() }