(function () {
  "use strict";

  function each(selector, root, fn) {
    Array.prototype.forEach.call((root || document).querySelectorAll(selector), fn);
  }

  if (navigator.clipboard && window.isSecureContext) {
    each("button[data-copy]", null, function (button) {
      var source = document.getElementById(button.getAttribute("data-copy"));
      if (!source) {
        return;
      }
      button.hidden = false;
      button.addEventListener("click", function () {
        navigator.clipboard.writeText(source.textContent.trim()).then(function () {
          button.setAttribute("data-copied", "");
        }, function () {
          button.removeAttribute("data-copied");
        });
      });
    });
  }

  each("form", null, function (form) {
    form.addEventListener("submit", function () {
      each("button[data-disable-on-submit]", form, function (button) {
        button.disabled = true;
      });
    });
  });

  window.addEventListener("pageshow", function () {
    each("button[data-disable-on-submit]", null, function (button) {
      button.disabled = false;
    });
  });
})();