Generate letter avatars if no avatar

src/m2d/converters/event-to-message.js

@@ -29,6 +29,8 @@ const pollComponents = sync.require("./poll-components")
 const setupEmojis = sync.require("../actions/setup-emojis")
 /** @type {import("../../d2m/converters/user-to-mxid")} */
 const userToMxid = sync.require("../../d2m/converters/user-to-mxid")
+/** @type {import("../../web/routes/letter-avatar")} */
+const letterAvatar = sync.require("../../web/routes/letter-avatar")
 
 /** @type {[RegExp, string][]} */
 const markdownEscapes = [
@@ -582,6 +584,11 @@ async function eventToMessage(event, guild, channel, di) {
 		displayNameRunoff = ""
 	}
 
+	// If undefined, generate letter avatar instead of using Discord default
+	if (avatarURL == undefined) {
+		avatarURL = letterAvatar.getLetterAvatarURL(event.sender, displayNameShortened)
+	}
+
 	let content = event.content["body"] || "" // ultimate fallback
 	/** @type {{id: string, filename: string}[]} */
 	const attachments = []