mirror of
https://github.com/balena-io/balena-cli.git
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105 lines
3.0 KiB
TypeScript
105 lines
3.0 KiB
TypeScript
/**
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* @license
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* Copyright 2019 Balena Ltd.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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import * as fs from 'fs';
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import * as readline from 'readline';
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export class MarkdownFileParser {
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constructor(public mdFilePath: string) {}
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/**
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* Extract the lines of a markdown document section with the given title.
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* For example, consider this sample markdown document:
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* ```
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* # balena CLI
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*
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* ## Introduction
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* Lorem ipsum dolor sit amet, consectetur adipiscing elit,
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*
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* ## Getting Started
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* sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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*
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* ### Prerequisites
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* - Foo
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* - Bar
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*
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* ## Support
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* Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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* ```
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*
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* Calling getSectionOfTitle('Getting Started') for the markdown doc above
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* returns everything from line '## Getting Started' (included) to line
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* '## Support' (excluded). This method counts the number of '#' characters
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* to determine that subsections should be included as part of the parent
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* section.
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*
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* @param title The section title without '#' chars, eg. 'Getting Started'
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*/
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public async getSectionOfTitle(
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title: string,
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includeSubsections = true,
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): Promise<string> {
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let foundSectionLines: string[];
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let foundSectionLevel = 0;
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const rl = readline.createInterface({
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input: fs.createReadStream(this.mdFilePath),
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crlfDelay: Infinity,
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});
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rl.on('line', (line) => {
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// try to match a line like "## Getting Started", where the number
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// of '#' characters is the sectionLevel ('##' -> 2), and the
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// sectionTitle is "Getting Started"
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const match = /^(#+)\s+(.+)/.exec(line);
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if (match) {
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const sectionLevel = match[1].length;
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const sectionTitle = match[2];
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// If the target section had already been found: append a line, or end it
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if (foundSectionLines) {
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if (!includeSubsections || sectionLevel <= foundSectionLevel) {
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// end previously found section
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rl.close();
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}
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} else if (sectionTitle === title) {
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// found the target section
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foundSectionLevel = sectionLevel;
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foundSectionLines = [];
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}
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}
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if (foundSectionLines) {
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foundSectionLines.push(line);
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}
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});
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return await new Promise((resolve, reject) => {
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rl.on('close', () => {
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if (foundSectionLines) {
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resolve(foundSectionLines.join('\n'));
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} else {
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reject(
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new Error(
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`Markdown section not found: title="${title}" file="${this.mdFilePath}"`,
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),
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);
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}
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});
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});
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}
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}
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