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+// search script, borrowed from book theme
+
+function debounce(func, wait) {
+    var timeout;
+  
+    return function () {
+      var context = this;
+      var args = arguments;
+      clearTimeout(timeout);
+  
+      timeout = setTimeout(function () {
+        timeout = null;
+        func.apply(context, args);
+      }, wait);
+    };
+  }
+  
+  // Taken from mdbook
+  // The strategy is as follows:
+  // First, assign a value to each word in the document:
+  //  Words that correspond to search terms (stemmer aware): 40
+  //  Normal words: 2
+  //  First word in a sentence: 8
+  // Then use a sliding window with a constant number of words and count the
+  // sum of the values of the words within the window. Then use the window that got the
+  // maximum sum. If there are multiple maximas, then get the last one.
+  // Enclose the terms in <b>.
+  function makeTeaser(body, terms) {
+    var TERM_WEIGHT = 40;
+    var NORMAL_WORD_WEIGHT = 2;
+    var FIRST_WORD_WEIGHT = 8;
+    var TEASER_MAX_WORDS = 30;
+  
+    var stemmedTerms = terms.map(function (w) {
+      return elasticlunr.stemmer(w.toLowerCase());
+    });
+    var termFound = false;
+    var index = 0;
+    var weighted = []; // contains elements of ["word", weight, index_in_document]
+  
+    // split in sentences, then words
+    var sentences = body.toLowerCase().split(". ");
+  
+    for (var i in sentences) {
+      var words = sentences[i].split(" ");
+      var value = FIRST_WORD_WEIGHT;
+  
+      for (var j in words) {
+        var word = words[j];
+  
+        if (word.length > 0) {
+          for (var k in stemmedTerms) {
+            if (elasticlunr.stemmer(word).startsWith(stemmedTerms[k])) {
+              value = TERM_WEIGHT;
+              termFound = true;
+            }
+          }
+          weighted.push([word, value, index]);
+          value = NORMAL_WORD_WEIGHT;
+        }
+  
+        index += word.length;
+        index += 1;  // ' ' or '.' if last word in sentence
+      }
+  
+      index += 1;  // because we split at a two-char boundary '. '
+    }
+  
+    if (weighted.length === 0) {
+      return body;
+    }
+  
+    var windowWeights = [];
+    var windowSize = Math.min(weighted.length, TEASER_MAX_WORDS);
+    // We add a window with all the weights first
+    var curSum = 0;
+    for (var i = 0; i < windowSize; i++) {
+      curSum += weighted[i][1];
+    }
+    windowWeights.push(curSum);
+  
+    for (var i = 0; i < weighted.length - windowSize; i++) {
+      curSum -= weighted[i][1];
+      curSum += weighted[i + windowSize][1];
+      windowWeights.push(curSum);
+    }
+  
+    // If we didn't find the term, just pick the first window
+    var maxSumIndex = 0;
+    if (termFound) {
+      var maxFound = 0;
+      // backwards
+      for (var i = windowWeights.length - 1; i >= 0; i--) {
+        if (windowWeights[i] > maxFound) {
+          maxFound = windowWeights[i];
+          maxSumIndex = i;
+        }
+      }
+    }
+  
+    var teaser = [];
+    var startIndex = weighted[maxSumIndex][2];
+    for (var i = maxSumIndex; i < maxSumIndex + windowSize; i++) {
+      var word = weighted[i];
+      if (startIndex < word[2]) {
+        // missing text from index to start of `word`
+        teaser.push(body.substring(startIndex, word[2]));
+        startIndex = word[2];
+      }
+  
+      // add <em/> around search terms
+      if (word[1] === TERM_WEIGHT) {
+        teaser.push("<b>");
+      }
+      startIndex = word[2] + word[0].length;
+      teaser.push(body.substring(word[2], startIndex));
+  
+      if (word[1] === TERM_WEIGHT) {
+        teaser.push("</b>");
+      }
+    }
+    teaser.push("…");
+    return teaser.join("");
+  }
+  
+  function formatSearchResultItem(item, terms) {
+    var li = document.createElement("li");
+    li.classList.add("search-results__item");
+    li.innerHTML = `<a href="${item.ref}">${item.doc.title}</a>`;
+    li.innerHTML += `<div class="search-results__teaser">${makeTeaser(item.doc.body, terms)}</div>`;
+    return li;
+  }
+  
+  // Go from the book view to the search view
+  function toggleSearchMode() {
+    var $wrapContent = document.querySelector("#wrap");
+    var $searchIcon = document.querySelector("#search-ico");
+    var $searchContainer = document.querySelector(".search-container");
+    if ($searchContainer.classList.contains("search-container--is-visible")) {
+      $searchContainer.classList.remove("search-container--is-visible");
+      $wrapContent.style.display = "";
+      $searchIcon.className = "ms-Icon--Search";
+    } else {
+      $searchContainer.classList.add("search-container--is-visible");
+      $wrapContent.style.display = "none";
+      $searchIcon.className = "ms-Icon--ChromeClose";
+      document.getElementById("search").focus();
+    }
+  }
+  
+  function initSearch() {
+    var $searchInput = document.getElementById("search");
+    if (!$searchInput) {
+      return;
+    }
+    var $searchIcon = document.querySelector("#search-ico");
+    $searchIcon.addEventListener("click", toggleSearchMode);
+  
+    var $searchResults = document.querySelector(".search-results");
+    var $searchResultsHeader = document.querySelector(".search-results__header");
+    var $searchResultsItems = document.querySelector(".search-results__items");
+    var MAX_ITEMS = 100;
+  
+    var options = {
+      bool: "AND",
+      fields: {
+        title: {boost: 2},
+        body: {boost: 1},
+      }
+    };
+    var currentTerm = "";
+    var index = elasticlunr.Index.load(window.searchIndex);
+  
+    $searchInput.addEventListener("keyup", debounce(function() {
+      var term = $searchInput.value.trim();
+      if (term === currentTerm || !index) {
+        return;
+      }
+      $searchResults.style.display = term === "" ? "none" : "block";
+      $searchResultsItems.innerHTML = "";
+      if (term === "") {
+        return;
+      }
+  
+      var results = index.search(term, options).filter(function (r) {
+        return r.doc.body !== "";
+      });
+      if (results.length === 0) {
+        $searchResultsHeader.innerText = `Nothing like «${term}»`;
+        return;
+      }
+  
+      currentTerm = term;
+        $searchResultsHeader.innerText = `${results.length} found for «${term}»:`;
+      for (var i = 0; i < Math.min(results.length, MAX_ITEMS); i++) {
+        if (!results[i].doc.body) {
+          continue;
+        }
+        // var item = document.createElement("li");
+        // item.innerHTML = formatSearchResultItem(results[i], term.split(" "));
+        console.log(results[i]);
+        $searchResultsItems.appendChild(formatSearchResultItem(results[i], term.split(" ")));
+      }
+    }, 150));
+  }
+  
+  if (document.readyState === "complete" ||
+      (document.readyState !== "loading" && !document.documentElement.doScroll)
+  ) {
+    initSearch();
+  } else {
+    document.addEventListener("DOMContentLoaded", initSearch);
+  }
+
+// mobile 
+
+  function burger() {
+    let x = document.querySelector("#trees");
+    let y = document.querySelector("#mobile");
+
+    if (x.style.display === "block") {
+      x.style.display = "none";
+      y.className = "ms-Icon--GlobalNavButton";
+    } else {
+      x.style.display = "block";
+      y.className = "ms-Icon--ChromeClose";
+    }
+  }
+
+// https://aaronluna.dev/blog/add-copy-button-to-code-blocks-hugo-chroma/
+
+function createCopyButton(highlightDiv) {
+  const button = document.createElement("button");
+  button.className = "copy-code-button ";
+  button.type = "button";
+  button.innerHTML = "&#xE8C8;";
+  button.addEventListener("click", () =>
+    copyCodeToClipboard(button, highlightDiv)
+  );
+  addCopyButtonToDom(button, highlightDiv);
+}
+
+async function copyCodeToClipboard(button, highlightDiv) {
+  const codeToCopy = highlightDiv.querySelector(":last-child > code")
+    .innerText;
+  try {
+    result = await navigator.permissions.query({ name: "clipboard-write" });
+    if (result.state == "granted" || result.state == "prompt") {
+      await navigator.clipboard.writeText(codeToCopy);
+    } else {
+      copyCodeBlockExecCommand(codeToCopy, highlightDiv);
+    }
+  } catch (_) {
+    copyCodeBlockExecCommand(codeToCopy, highlightDiv);
+  } finally {
+    codeWasCopied(button);
+  }
+}
+
+function copyCodeBlockExecCommand(codeToCopy, highlightDiv) {
+  const textArea = document.createElement("textArea");
+  textArea.contentEditable = "true";
+  textArea.readOnly = "false";
+  textArea.className = "copyable-text-area";
+  textArea.value = codeToCopy;
+  highlightDiv.insertBefore(textArea, highlightDiv.firstChild);
+  const range = document.createRange();
+  range.selectNodeContents(textArea);
+  const sel = window.getSelection();
+  sel.removeAllRanges();
+  sel.addRange(range);
+  textArea.setSelectionRange(0, 999999);
+  document.execCommand("copy");
+  highlightDiv.removeChild(textArea);
+}
+
+function codeWasCopied(button) {
+  button.blur();
+  button.innerHTML = "&#xE74E;";
+  setTimeout(function () {
+    button.innerHTML = "&#xE8C8;";
+  }, 2000);
+}
+
+function addCopyButtonToDom(button, highlightDiv) {
+  highlightDiv.insertBefore(button, highlightDiv.firstChild);
+  const wrapper = document.createElement("div");
+  wrapper.className = "highlight-wrapper";
+  highlightDiv.parentNode.insertBefore(wrapper, highlightDiv);
+  wrapper.appendChild(highlightDiv);
+}
+
+document
+  .querySelectorAll("pre")
+  .forEach((highlightDiv) => createCopyButton(highlightDiv));