faster emoji search (kinda)

frontend/lib/chat.mjs

@@ -3,7 +3,7 @@ import {
   setVideoTime,
   setPlaying,
 } from "./watch-session.mjs?v=19ef791";
-import { emojify, emojis } from "./emojis.mjs?v=19ef791";
+import { emojify, findEmojis } from "./emojis.mjs?v=19ef791";
 
 function setCaretPosition(elem, caretPos) {
   if (elem.createTextRange) {
@@ -26,14 +26,16 @@ const setupChatboxEvents = (socket) => {
   const emojiAutocomplete = chatForm.querySelector("#emoji-autocomplete");
   oldChatForm.replaceWith(chatForm);
 
-  let autocompleting = false;
+  let autocompleting = false,
+    showListTimer;
 
   const replaceMessage = (message) => () => {
     messageInput.value = message;
     autocomplete();
   };
-  async function autocomplete() {
+  async function autocomplete(fromListTimeout) {
     if (autocompleting) return;
+    clearInterval(showListTimer);
     emojiAutocomplete.textContent = "";
     autocompleting = true;
     let text = messageInput.value.slice(0, messageInput.selectionStart);
@@ -41,25 +43,26 @@ const setupChatboxEvents = (socket) => {
     if (!match || match[1]) return (autocompleting = false); // We don't need to autocomplete.
     const prefix = text.slice(0, match.index);
     const search = text.slice(match.index + 1);
+    if (search.length < 1 && !fromListTimeout) {
+      autocompleting = false;
+      showListTimer = setTimeout(() => autocomplete(true), 1000);
+      return;
+    }
     const suffix = messageInput.value.slice(messageInput.selectionStart);
+    let selected;
     const select = (button) => {
-      const selected = document.querySelector(".emoji-option.selected");
       if (selected) selected.classList.remove("selected");
+      selected = button;
       button.classList.add("selected");
     };
     emojiAutocomplete.append(
-      ...(await emojis)
-        .filter(([name]) => name.toLowerCase().startsWith(search.toLowerCase()))
-        .map(([name, replaceWith, ext], i) => {
+      ...(await findEmojis(search)).map(([name, replaceWith, ext], i) => {
         const button = Object.assign(document.createElement("button"), {
-            className: "emoji-option" + (i === 0 ? " selected" : ""),
+          className: "emoji-option",
           onmousedown: (e) => e.preventDefault(),
           onclick: () => {
             messageInput.value = prefix + replaceWith + " " + suffix;
-              setCaretPosition(
-                messageInput,
-                (prefix + " " + replaceWith).length
-              );
+            setCaretPosition(messageInput, (prefix + " " + replaceWith).length);
           },
           onmouseover: () => select(button),
           onfocus: () => select(button),
@@ -85,12 +88,14 @@ const setupChatboxEvents = (socket) => {
         return button;
       })
     );
-    if (emojiAutocomplete.children[0])
+    if (emojiAutocomplete.children[0]) {
       emojiAutocomplete.children[0].scrollIntoView();
+      select(emojiAutocomplete.children[0]);
+    }
     autocompleting = false;
   }
-  messageInput.addEventListener("input", autocomplete);
-  messageInput.addEventListener("selectionchange", autocomplete);
+  messageInput.addEventListener("input", () => autocomplete());
+  messageInput.addEventListener("selectionchange", () => autocomplete());
   messageInput.addEventListener("keydown", (event) => {
     if (event.key == "ArrowUp" || event.key == "ArrowDown") {
       let selected = document.querySelector(".emoji-option.selected");

frontend/lib/emojis.mjs

@@ -1,11 +1,11 @@
 export async function emojify(text) {
-  const emojiList = await emojis;
+  await emojisLoaded;
   let last = 0;
   let nodes = [];
   text.replace(/:([^\s:]+):/g, (match, name, index) => {
     if (last <= index)
       nodes.push(document.createTextNode(text.slice(last, index)));
-    let emoji = emojiList.find((e) => e[0] == name);
+    let emoji = emojis[name.toLowerCase()[0]].find((e) => e[0] == name);
     if (!emoji) {
       nodes.push(document.createTextNode(match));
     } else {
@@ -26,11 +26,44 @@ export async function emojify(text) {
   if (last < text.length) nodes.push(document.createTextNode(text.slice(last)));
   return nodes;
 }
-export const emojis = Promise.all([
+const emojis = {};
+
+export const emojisLoaded = Promise.all([
   fetch("/emojis")
     .then((e) => e.json())
-    .then((e) =>
-      e.map((e) => [e.slice(0, -4), ":" + e.slice(0, -4) + ":", e.slice(-4)])
-    ),
-  fetch("/emojis/unicode.json").then((e) => e.json()),
-]).then((e) => e.flat(1));
+    .then((a) => {
+      for (let e of a) {
+        const name = e.slice(0, -4),
+          lower = name.toLowerCase();
+        emojis[lower[0]] = emojis[lower[0]] || [];
+        emojis[lower[0]].push([name, ":" + name + ":", e.slice(-4), lower]);
+      }
+    }),
+  fetch("/emojis/unicode.json")
+    .then((e) => e.json())
+    .then((a) => {
+      for (let e of a) {
+        emojis[e[0][0]] = emojis[e[0][0]] || [];
+        emojis[e[0][0]].push([e[0], e[1], null, e[0]]);
+      }
+    }),
+]);
+
+export async function findEmojis(search) {
+  await emojisLoaded;
+  let groups = [[], []];
+  if (search.length < 1) {
+    for (let letter in emojis)
+      for (let emoji of emojis[letter]) {
+        (emoji[1][0] === ":" ? groups[0] : groups[1]).push(emoji);
+      }
+  } else {
+    search = search.toLowerCase();
+    for (let emoji of emojis[search[0]]) {
+      if (search.length == 1 || emoji[3].startsWith(search)) {
+        (emoji[1][0] === ":" ? groups[0] : groups[1]).push(emoji);
+      }
+    }
+  }
+  return [...groups[0], ...groups[1]];
+}