1 files changed, 43 insertions, 0 deletions
diff --git a/common/hugio/writers.go b/common/hugio/writers.go
new file mode 100644
index 000000000..2766146e1
--- /dev/null
+++ b/common/hugio/writers.go
@@ -0,0 +1,43 @@
+// Copyright 2018 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hugio
+
+import (
+	"io"
+)
+
+type multiWriteCloser struct {
+	io.Writer
+	closers []io.WriteCloser
+}
+
+func (m multiWriteCloser) Close() error {
+	var err error
+	for _, c := range m.closers {
+		if closeErr := c.Close(); err != nil {
+			err = closeErr
+		}
+	}
+	return err
+}
+
+// NewMultiWriteCloser creates a new io.WriteCloser that duplicates its writes to all the
+// provided writers.
+func NewMultiWriteCloser(writeClosers ...io.WriteCloser) io.WriteCloser {
+	writers := make([]io.Writer, len(writeClosers))
+	for i, w := range writeClosers {
+		writers[i] = w
+	}
+	return multiWriteCloser{Writer: io.MultiWriter(writers...), closers: writeClosers}
+}