github.com/fighterlyt/hugo@v0.47.1/common/hugio/writers.go (about) 1 // Copyright 2018 The Hugo Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // http://www.apache.org/licenses/LICENSE-2.0 7 // 8 // Unless required by applicable law or agreed to in writing, software 9 // distributed under the License is distributed on an "AS IS" BASIS, 10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 // See the License for the specific language governing permissions and 12 // limitations under the License. 13 14 package hugio 15 16 import ( 17 "io" 18 ) 19 20 type multiWriteCloser struct { 21 io.Writer 22 closers []io.WriteCloser 23 } 24 25 func (m multiWriteCloser) Close() error { 26 var err error 27 for _, c := range m.closers { 28 if closeErr := c.Close(); err != nil { 29 err = closeErr 30 } 31 } 32 return err 33 } 34 35 // NewMultiWriteCloser creates a new io.WriteCloser that duplicates its writes to all the 36 // provided writers. 37 func NewMultiWriteCloser(writeClosers ...io.WriteCloser) io.WriteCloser { 38 writers := make([]io.Writer, len(writeClosers)) 39 for i, w := range writeClosers { 40 writers[i] = w 41 } 42 return multiWriteCloser{Writer: io.MultiWriter(writers...), closers: writeClosers} 43 }