mirror of https://github.com/k3s-io/k3s
116 lines
3.7 KiB
Go
116 lines
3.7 KiB
Go
/*
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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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"bufio"
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"bytes"
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"fmt"
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"strings"
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)
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// inserts/updates a table of contents in markdown file.
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//
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// First, builds a ToC.
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// Then, finds <!-- BEGIN GENERATED TOC --> and <!-- END GENERATED TOC -->, and replaces anything between those with
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// the ToC, thereby updating any previously inserted ToC.
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//
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// TODO(erictune): put this in own package with tests
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func updateTOC(filePath string, markdown []byte) ([]byte, error) {
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toc, err := buildTOC(markdown)
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if err != nil {
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return nil, err
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}
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updatedMarkdown, err := updateMacroBlock(markdown, "<!-- BEGIN GENERATED TOC -->", "<!-- END GENERATED TOC -->", string(toc))
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if err != nil {
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return nil, err
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}
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return updatedMarkdown, nil
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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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// builds table of contents for markdown file
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//
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// First scans for all section headers (lines that begin with "#" but not within code quotes)
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// and builds a table of contents from those. Assumes bookmarks for those will be
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// like #each-word-in-heading-in-lowercases-with-dashes-instead-of-spaces.
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// builds the ToC.
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func buildTOC(markdown []byte) ([]byte, error) {
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var buffer bytes.Buffer
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scanner := bufio.NewScanner(bytes.NewReader(markdown))
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for scanner.Scan() {
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line := scanner.Text()
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noSharps := strings.TrimLeft(line, "#")
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numSharps := len(line) - len(noSharps)
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heading := strings.Trim(noSharps, " \n")
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if numSharps > 0 {
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indent := strings.Repeat(" ", numSharps-1)
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bookmark := strings.Replace(strings.ToLower(heading), " ", "-", -1)
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tocLine := fmt.Sprintf("%s- [%s](#%s)\n", indent, heading, bookmark)
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buffer.WriteString(tocLine)
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}
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}
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if err := scanner.Err(); err != nil {
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return []byte{}, err
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}
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return buffer.Bytes(), nil
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}
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