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#!/usr/bin/env node
const path = require('path');
const fs = require('fs');
const yaml = require('yaml');
const cmark = require('cmark-gfm');
const mdx = require('@mdx-js/mdx');
const mkdirp = require('mkdirp');
const jsdom = require('jsdom');
const npm = require('../lib/npm.js')
const config = require('./config.json');
const docsRoot = __dirname;
const inputRoot = path.join(docsRoot, 'content');
const outputRoot = path.join(docsRoot, 'output');
const template = fs.readFileSync('template.html').toString();
const run = async function() {
try {
const navPaths = await getNavigationPaths();
const fsPaths = await renderFilesystemPaths();
if (!ensureNavigationComplete(navPaths, fsPaths)) {
process.exit(1);
}
}
catch (error) {
console.error(error);
}
}
run();
function ensureNavigationComplete(navPaths, fsPaths) {
const unmatchedNav = { }, unmatchedFs = { };
for (const navPath of navPaths) {
unmatchedNav[navPath] = true;
}
for (let fsPath of fsPaths) {
fsPath = '/' + fsPath.replace(/\.md$/, "");
if (unmatchedNav[fsPath]) {
delete unmatchedNav[fsPath];
}
else {
unmatchedFs[fsPath] = true;
}
}
const missingNav = Object.keys(unmatchedNav).sort();
const missingFs = Object.keys(unmatchedFs).sort()
if (missingNav.length > 0 || missingFs.length > 0) {
let message = "Error: documentation navigation (nav.yml) does not match filesystem.\n";
if (missingNav.length > 0) {
message += "\nThe following path(s) exist on disk but are not present in nav.yml:\n\n";
for (const nav of missingNav) {
message += ` ${nav}\n`;
}
}
if (missingNav.length > 0 && missingFs.length > 0) {
message += "\nThe following path(s) exist in nav.yml but are not present on disk:\n\n";
for (const fs of missingFs) {
message += ` ${fs}\n`;
}
}
message += "\nUpdate nav.yml to ensure that all files are listed in the appropriate place.";
console.error(message);
return false;
}
return true;
}
function getNavigationPaths() {
const navFilename = path.join(docsRoot, 'nav.yml');
const nav = yaml.parse(fs.readFileSync(navFilename).toString(), 'utf8');
return walkNavigation(nav);
}
function walkNavigation(entries) {
const paths = [ ]
for (const entry of entries) {
if (entry.children) {
paths.push(... walkNavigation(entry.children));
}
else {
paths.push(entry.url);
}
}
return paths;
}
async function renderFilesystemPaths() {
return await walkFilesystem(inputRoot);
}
async function walkFilesystem(root, dirRelative) {
const paths = [ ]
const dirPath = dirRelative ? path.join(root, dirRelative) : root;
const children = fs.readdirSync(dirPath);
for (const childFilename of children) {
const childRelative = dirRelative ? path.join(dirRelative, childFilename) : childFilename;
const childPath = path.join(root, childRelative);
if (fs.lstatSync(childPath).isDirectory()) {
paths.push(... await walkFilesystem(root, childRelative));
}
else {
await renderFile(childRelative);
paths.push(childRelative);
}
}
return paths;
}
async function renderFile(childPath) {
const inputPath = path.join(inputRoot, childPath);
if (!inputPath.match(/\.md$/)) {
console.log(`warning: unknown file type ${inputPath}, ignored`);
return;
}
const outputPath = path.join(outputRoot, childPath.replace(/\.md$/, '.html'));
let md = fs.readFileSync(inputPath).toString();
let frontmatter = { };
// Take the leading frontmatter out of the markdown
md = md.replace(/^---\n([\s\S]+)\n---\n/, (header, fm) => {
frontmatter = yaml.parse(fm, 'utf8');
return '';
});
// Replace any tokens in the source
md = md.replace(/@VERSION@/, npm.version);
// Render the markdown into an HTML snippet using a GFM renderer.
const content = cmark.renderHtmlSync(md, {
'smart': true,
'githubPreLang': true,
'strikethroughDoubleTilde': true,
'unsafe': false,
extensions: {
'table': true,
'strikethrough': true,
'tagfilter': true,
'autolink': true
}
});
// Test that mdx can parse this markdown file. We don't actually
// use the output, it's just to ensure that the upstream docs
// site (docs.npmjs.com) can parse it when this file gets there.
try {
await mdx(md, { skipExport: true });
}
catch (error) {
throw new MarkdownError(childPath, error);
}
// Inject this data into the template, using a mustache-like
// replacement scheme.
const html = template.replace(/\{\{\s*([\w\.]+)\s*\}\}/g, (token, key) => {
switch (key) {
case 'content':
return `<div id="_content">${content}</div>`;
case 'path':
return childPath;
case 'url_path':
return encodeURI(childPath);
case 'toc':
return '<div id="_table_of_contents"></div>';
case 'title':
case 'section':
case 'description':
return frontmatter[key];
case 'config.github_repo':
case 'config.github_branch':
case 'config.github_path':
return config[key.replace(/^config\./, '')];
default:
console.log(`warning: unknown token '${token}' in ${inputPath}`);
return '';
}
return key;
});
const dom = new jsdom.JSDOM(html);
const document = dom.window.document;
// Rewrite relative URLs in links and image sources to be relative to
// this file; this is for supporting `file://` links. HTML pages need
// suffix appended.
const links = [
{ tag: 'a', attr: 'href', suffix: '.html' },
{ tag: 'img', attr: 'src' }
];
for (let linktype of links) {
for (let tag of document.querySelectorAll(linktype.tag)) {
let url = tag.getAttribute(linktype.attr);
if (url.startsWith('/')) {
const childDepth = childPath.split('/').length - 1;
const prefix = childDepth > 0 ? '../'.repeat(childDepth) : './';
url = url.replace(/^\//, prefix);
if (linktype.suffix) {
url += linktype.suffix;
}
tag.setAttribute(linktype.attr, url);
}
}
}
// Give headers a unique id so that they can be linked within the doc
const headerIds = [ ];
for (let header of document.querySelectorAll('h1, h2, h3, h4, h5, h6')) {
if (header.getAttribute('id')) {
headerIds.push(header.getAttribute('id'));
continue;
}
const headerText = header.textContent.replace(/[A-Z]/g, x => x.toLowerCase()).replace(/ /g, '-').replace(/[^a-z0-9\-]/g, '');
let headerId = headerText;
let headerIncrement = 1;
while (document.getElementById(headerId) !== null) {
headerId = headerText + (++headerIncrement);
}
headerIds.push(headerId);
header.setAttribute('id', headerId);
}
// Walk the dom and build a table of contents
const toc = document.getElementById('_table_of_contents');
if (toc) {
toc.appendChild(generateTableOfContents(document));
}
// Write the final output
const output = dom.serialize();
mkdirp.sync(path.dirname(outputPath));
fs.writeFileSync(outputPath, output);
}
function generateTableOfContents(document) {
const headers = [ ];
walkHeaders(document.getElementById('_content'), headers);
let parent = null;
// The nesting depth of headers are not necessarily the header level.
// (eg, h1 > h3 > h5 is a depth of three even though there's an h5.)
const hierarchy = [ ];
for (let header of headers) {
const level = headerLevel(header);
while (hierarchy.length && hierarchy[hierarchy.length - 1].headerLevel > level) {
hierarchy.pop();
}
if (!hierarchy.length || hierarchy[hierarchy.length - 1].headerLevel < level) {
const newList = document.createElement('ul');
newList.headerLevel = level;
if (hierarchy.length) {
hierarchy[hierarchy.length - 1].appendChild(newList);
}
hierarchy.push(newList);
}
const element = document.createElement('li');
const link = document.createElement('a');
link.setAttribute('href', `#${header.getAttribute('id')}`);
link.innerHTML = header.innerHTML;
element.appendChild(link);
const list = hierarchy[hierarchy.length - 1];
list.appendChild(element);
}
return hierarchy[0];
}
function walkHeaders(element, headers) {
for (let child of element.childNodes) {
if (headerLevel(child)) {
headers.push(child);
}
walkHeaders(child, headers);
}
}
function headerLevel(node) {
const level = node.tagName ? node.tagName.match(/^[Hh]([123456])$/) : null;
return level ? level[1] : 0;
}
function debug(str) {
console.log(str);
}
class MarkdownError extends Error {
constructor(file, inner) {
super(`failed to parse ${file}`);
this.file = file;
this.inner = inner;
}
}