mirror of https://github.com/k3s-io/k3s
68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 main
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import (
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"bytes"
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"fmt"
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"strings"
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)
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// Replaces the text between matching "beginMark" and "endMark" within "document" with "insertThis".
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//
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// Delimiters should occupy own line.
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// Returns copy of document with modifications.
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func updateMacroBlock(document []byte, beginMark, endMark, insertThis string) ([]byte, error) {
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var buffer bytes.Buffer
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lines := strings.Split(string(document), "\n")
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// Skip trailing empty string from Split-ing
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if len(lines) > 0 && lines[len(lines)-1] == "" {
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lines = lines[:len(lines)-1]
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}
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betweenBeginAndEnd := false
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for _, line := range lines {
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trimmedLine := strings.Trim(line, " \n")
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if trimmedLine == beginMark {
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if betweenBeginAndEnd {
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return nil, fmt.Errorf("found second begin mark while updating macro blocks")
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}
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betweenBeginAndEnd = true
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buffer.WriteString(line)
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buffer.WriteString("\n")
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} else if trimmedLine == endMark {
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if !betweenBeginAndEnd {
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return nil, fmt.Errorf("found end mark without being mark while updating macro blocks")
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}
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buffer.WriteString(insertThis)
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// Extra newline avoids github markdown bug where comment ends up on same line as last bullet.
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buffer.WriteString("\n")
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buffer.WriteString(line)
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buffer.WriteString("\n")
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betweenBeginAndEnd = false
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} else {
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if !betweenBeginAndEnd {
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buffer.WriteString(line)
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buffer.WriteString("\n")
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}
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}
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}
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if betweenBeginAndEnd {
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return nil, fmt.Errorf("never found closing end mark while updating macro blocks")
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}
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return buffer.Bytes(), nil
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}
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