WIP: сборка английской версии mdbook

.github/theme/language-switcher.js

@@ -0,0 +1,63 @@
+(function () {
+  "use strict";
+
+  // Detects current language from the URL path.
+  // Russian lives at /APS/...  English lives at /APS/en/...
+  function currentLang() {
+    return /\/en\//.test(window.location.pathname) ? "en" : "ru";
+  }
+
+  function switchLanguage() {
+    var path = window.location.pathname;
+    var newPath;
+
+    if (currentLang() === "en") {
+      // /APS/en/foo/bar.html  →  /APS/foo/bar.html
+      newPath = path.replace("/en/", "/");
+    } else {
+      // /APS/foo/bar.html  →  /APS/en/foo/bar.html
+      // Insert "en/" after the first path segment (the repo root, e.g. /APS/)
+      newPath = path.replace(/^(\/[^\/]+\/)/, "$1en/");
+    }
+
+    window.location.href =
+      newPath + window.location.search + window.location.hash;
+  }
+
+  function addSwitcher() {
+    var lang = currentLang();
+
+    var btn = document.createElement("button");
+    btn.id = "language-switcher";
+    btn.setAttribute(
+      "title",
+      lang === "ru" ? "Switch to English" : "Переключить на русский"
+    );
+    btn.setAttribute("aria-label", btn.getAttribute("title"));
+
+    // Flag + label
+    var icon = document.createElement("span");
+    icon.setAttribute("aria-hidden", "true");
+    icon.textContent = lang === "ru" ? "🇬🇧" : "🇷🇺";
+
+    var label = document.createElement("span");
+    label.className = "lang-label";
+    label.textContent = lang === "ru" ? "EN" : "RU";
+
+    btn.appendChild(icon);
+    btn.appendChild(label);
+    btn.addEventListener("click", switchLanguage);
+
+    // mdBook places theme/print/search buttons in .right-buttons
+    var target = document.querySelector(".right-buttons");
+    if (target) {
+      target.insertBefore(btn, target.firstChild);
+    }
+  }
+
+  if (document.readyState === "loading") {
+    document.addEventListener("DOMContentLoaded", addSwitcher);
+  } else {
+    addSwitcher();
+  }
+})();