Add search functionality

public/static/search.js

@@ -0,0 +1,45 @@
+(() => {
+    let searchBox = document.getElementById("search-box");
+    let searchResults = document.getElementById("search-results");
+    let toc = document.getElementById("toc");
+
+    /**
+     * @param {string} results
+     */
+    function updateSearchResults(results) {
+        if (results.length > 0) {
+            searchResults.innerHTML = "";
+            for (let i = 0; i < results.length; i++) {
+                let resultElem = document.createElement("div");
+                let resultAnchor = document.createElement("a");
+                resultAnchor.href = results[i]; // we should be at /, so this is right
+                resultAnchor.innerText = results[i];
+                resultElem.appendChild(resultAnchor);
+                searchResults.appendChild(resultElem);
+            }
+            toc.classList.add("hidden");
+            searchResults.classList.remove("hidden");
+        } else {
+            toc.classList.remove("hidden");
+            searchResults.classList.add("hidden");
+        }
+    }
+
+    async function handleSearchInput() {
+        // get search query
+        const query = searchBox.value;
+        if (query == "") {
+            updateSearchResults([]);
+            return
+        }
+        // make request
+        const response = await fetch("/search/" + query);
+        if (!response.ok) {
+            throw new Error("Couldn't search, status code ", response.status);
+        }
+        let result = await response.text();
+        updateSearchResults(result.split('\n'));
+    }
+
+    searchBox.addEventListener("input", handleSearchInput);
+})();