feat: transform :emoji: in text to unicode emoji

deps.ts

@@ -2,6 +2,7 @@ export * as log from "https://deno.land/std@0.214.0/log/mod.ts";
 export * as hex from "https://deno.land/std@0.214.0/encoding/hex.ts";
 
 export * as httpErrors from "https://deno.land/x/http_errors@3.0.0/mod.ts";
+export * as githubEmoji from "https://deno.land/x/github_emoji@v0.1.1/mod.ts";
 
 export * as redis from "https://deno.land/x/redis@v0.32.1/mod.ts";
 export { Mutex } from "https://deno.land/x/async@v2.1.0/mod.ts";

lib/formatter.ts

@@ -1,9 +1,11 @@
+import { githubEmoji } from "../deps.ts";
+
 // Empirically determined GitHub embed description limit in the Discord API.
 // Anything above this will be ellipsized :/
 const EMBED_LIMIT = 500;
 
-function maybeTransformText(s: string): string {
-    // If length exceeds limit, add backticks since they might otherwise be removed
+// If length exceeds limit, add backticks since they might otherwise be removed
+function ellipsizeText(s: string): string {
     const suffix = "…\n```";
     const maxLen = EMBED_LIMIT - suffix.length;
     // n.b. this heuristic is by no means perfect; it might add backticks when not necessary,
@@ -14,6 +16,15 @@ function maybeTransformText(s: string): string {
     return s;
 }
 
+function transformEmojis(s: string): string {
+    return githubEmoji.emojify(s);
+}
+
+const TRANSFORMS: ((s: string) => string)[] = [
+    transformEmojis,
+    ellipsizeText,
+];
+
 export default function fixupEmbeds(data: Record<string, any>): void {
     for (
         const field of [
@@ -31,6 +42,10 @@ export default function fixupEmbeds(data: Record<string, any>): void {
             "answer",
         ]
     ) {
-        if (data[field]?.body) data[field].body = maybeTransformText(data[field].body);
+        if (data[field]?.body) {
+            for (const transform of TRANSFORMS) {
+                data[field].body = transform(data[field].body);
+            }
+        }
     }
 }