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checkLinks.mjs
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checkLinks.mjs
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import fs from 'fs';
import { extname, join, resolve } from 'path';
import { pathToFileURL } from 'url';
import gfm from 'remark-gfm';
import markdown from 'remark-parse';
import unified from 'unified';
const DIR = resolve(process.argv[2]);
console.log('Running Markdown link checker...');
findMarkdownFilesRecursively(DIR);
function* getLinksRecursively(node) {
if (node.url && !node.url.startsWith('#')) {
yield node;
}
for (const child of node.children || []) {
yield* getLinksRecursively(child);
}
}
function findMarkdownFilesRecursively(dirPath) {
const entries = fs.readdirSync(dirPath, { withFileTypes: true });
for (const entry of entries) {
const path = join(dirPath, entry.name);
if (
entry.isDirectory() &&
entry.name !== 'build' &&
entry.name !== 'changelogs' &&
entry.name !== 'deps' &&
entry.name !== 'fixtures' &&
entry.name !== 'gyp' &&
entry.name !== 'node_modules' &&
entry.name !== 'out' &&
entry.name !== 'tmp'
) {
findMarkdownFilesRecursively(path);
} else if (entry.isFile() && extname(entry.name) === '.md') {
checkFile(path);
}
}
}
function checkFile(path) {
const tree = unified()
.use(markdown)
.use(gfm)
.parse(fs.readFileSync(path));
const base = pathToFileURL(path);
let previousDefinitionLabel;
for (const node of getLinksRecursively(tree)) {
const targetURL = new URL(node.url, base);
if (targetURL.protocol === 'file:' && !fs.existsSync(targetURL)) {
const { line, column } = node.position.start;
console.error((process.env.GITHUB_ACTIONS ?
`::error file=${path},line=${line},col=${column}::` : '') +
`Broken link at ${path}:${line}:${column} (${node.url})`);
process.exitCode = 1;
}
if (node.type === 'definition') {
if (previousDefinitionLabel &&
previousDefinitionLabel > node.label) {
const { line, column } = node.position.start;
console.error(
(process.env.GITHUB_ACTIONS ? `::error file=${path},line=${line},col=${column}::` : '') +
`Unordered reference at ${path}:${line}:${column} ("${node.label}" should be before "${previousDefinitionLabel}")`
);
process.exitCode = 1;
}
previousDefinitionLabel = node.label;
}
}
}