64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package strings
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import (
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"bytes"
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"io"
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"strings"
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)
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// A Line Delimiter is a filter that will
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type LineDelimiter struct {
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output io.Writer
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delimiter []byte
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buf bytes.Buffer
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}
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// NewLineDelimiter allocates a new io.Writer that will split input on lines
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// and bracket each line with the delimiter string. This can be useful in
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// output tests where it is difficult to see and test trailing whitespace.
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func NewLineDelimiter(output io.Writer, delimiter string) *LineDelimiter {
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return &LineDelimiter{output: output, delimiter: []byte(delimiter)}
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}
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// Write writes buf to the LineDelimiter ld. The only errors returned are ones
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// encountered while writing to the underlying output stream.
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func (ld *LineDelimiter) Write(buf []byte) (n int, err error) {
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return ld.buf.Write(buf)
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}
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// Flush all lines up until now. This will assume insert a linebreak at the current point of the stream.
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func (ld *LineDelimiter) Flush() (err error) {
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lines := strings.Split(ld.buf.String(), "\n")
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for _, line := range lines {
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if _, err = ld.output.Write(ld.delimiter); err != nil {
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return
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}
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if _, err = ld.output.Write([]byte(line)); err != nil {
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return
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}
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if _, err = ld.output.Write(ld.delimiter); err != nil {
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return
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}
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if _, err = ld.output.Write([]byte("\n")); err != nil {
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return
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}
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}
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return
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}
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