HTML-ify message bodies once, on receipt, and not every time the message is rendered.

~16% of the `hi development` channel's rendering time was taken up on this.

1 files changed, 5 insertions, 1 deletions

diff --git a/ui/lib/store/messages.svelte.js b/ui/lib/store/messages.svelte.js
index c0db71b..0ceba54 100644
--- a/ui/lib/store/messages.svelte.js
+++ b/ui/lib/store/messages.svelte.js
@@ -1,3 +1,6 @@
+import { marked } from 'marked';
+import DOMPurify from 'dompurify';
+
 const RUN_COALESCE_MAX_INTERVAL = 10 /* min */ * 60 /* sec */ * 1000; /* ms */
 
 export class Messages {
@@ -9,7 +12,8 @@ export class Messages {
 
   addMessage(channel, id, { at, sender, body }) {
     let parsedAt = new Date(at);
-    const message = { id, at: parsedAt, body };
+    let renderedBody = DOMPurify.sanitize(marked.parse(body, { breaks: true }));
+    const message = { id, at: parsedAt, body, renderedBody };
 
     // You might be thinking, can't this be
     //