Vendor dependencies

Let's see how I like this workflow.

vendor/cxx/book/build.js

@@ -0,0 +1,104 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const cheerio = require('cheerio');
+const hljs = require('./build/highlight.js');
+const Entities = require('html-entities').AllHtmlEntities;
+const entities = new Entities();
+
+const githublink = `\
+<li class="part-title">\
+<a href="https://github.com/dtolnay/cxx">\
+<i class="fa fa-github"></i>\
+https://github.com/dtolnay/cxx\
+</a>\
+</li>`;
+
+const opengraph = `\
+<meta property="og:image" content="https://cxx.rs/cxx.png" />\
+<meta property="og:site_name" content="CXX" />\
+<meta property="og:title" content="CXX — safe interop between Rust and C++" />\
+<meta name="twitter:image:src" content="https://cxx.rs/cxx.png" />\
+<meta name="twitter:site" content="@davidtolnay" />\
+<meta name="twitter:card" content="summary" />\
+<meta name="twitter:title" content="CXX — safe interop between Rust and C++" />`;
+
+const htmljs = `\
+var html = document.querySelector('html');
+html.classList.remove('no-js');
+html.classList.add('js');`;
+
+const dirs = ['build'];
+while (dirs.length) {
+  const dir = dirs.pop();
+  fs.readdirSync(dir).forEach((entry) => {
+    path = dir + '/' + entry;
+    const stat = fs.statSync(path);
+    if (stat.isDirectory()) {
+      dirs.push(path);
+      return;
+    }
+
+    if (!path.endsWith('.html')) {
+      return;
+    }
+
+    const index = fs.readFileSync(path, 'utf8');
+    const $ = cheerio.load(index, { decodeEntities: false });
+
+    $('head').append(opengraph);
+    $('script:nth-of-type(3)').text(htmljs);
+    $('nav#sidebar ol.chapter').append(githublink);
+    $('head link[href="tomorrow-night.css"]').attr('disabled', true);
+    $('head link[href="ayu-highlight.css"]').attr('disabled', true);
+    $('button#theme-toggle').attr('style', 'display:none');
+    $('pre code').each(function () {
+      const node = $(this);
+      const langClass = node.attr('class').split(' ', 2)[0];
+      if (!langClass.startsWith('language-')) {
+        return;
+      }
+      const lang = langClass.replace('language-', '');
+      const lines = node.html().split('\n');
+      const boring = lines.map((line) =>
+        line.includes('<span class="boring">')
+      );
+      const ellipsis = lines.map((line) => line.includes('// ...'));
+      const target = entities.decode(node.text());
+      const highlighted = hljs.highlight(lang, target).value;
+      const result = highlighted
+        .split('\n')
+        .map(function (line, i) {
+          if (boring[i]) {
+            line = '<span class="boring">' + line;
+          } else if (ellipsis[i]) {
+            line = '<span class="ellipsis">' + line;
+          }
+          if (i > 0 && (boring[i - 1] || ellipsis[i - 1])) {
+            line = '</span>' + line;
+          }
+          return line;
+        })
+        .join('\n');
+      node.text(result);
+      node.removeClass(langClass);
+      if (!node.hasClass('focuscomment')) {
+        node.addClass('hidelines');
+        node.addClass('hide-boring');
+      }
+    });
+    $('code').each(function () {
+      $(this).addClass('hljs');
+    });
+
+    const out = $.html();
+    fs.writeFileSync(path, out);
+  });
+}
+
+fs.copyFileSync('build/highlight.css', 'build/tomorrow-night.css');
+fs.copyFileSync('build/highlight.css', 'build/ayu-highlight.css');
+
+var bookjs = fs.readFileSync('build/book.js', 'utf8');
+bookjs = bookjs.replace('set_theme(theme, false);', '');
+fs.writeFileSync('build/book.js', bookjs);