m->d bridge known emojis in messages

db/ooye-test-data.sql

@@ -67,10 +67,12 @@ INSERT INTO file (discord_url, mxc_url) VALUES
 ('https://cdn.discordapp.com/guilds/112760669178241024/users/134826546694193153/avatars/38dd359aa12bcd52dd3164126c587f8c.png?size=1024', 'mxc://cadence.moe/rfemHmAtcprjLEiPiEuzPhpl'),
 ('https://cdn.discordapp.com/icons/112760669178241024/a_f83622e09ead74f0c5c527fe241f8f8c.png?size=1024', 'mxc://cadence.moe/zKXGZhmImMHuGQZWJEFKJbsF'),
 ('https://cdn.discordapp.com/avatars/113340068197859328/b48302623a12bc7c59a71328f72ccb39.png?size=1024', 'mxc://cadence.moe/UpAeIqeclhKfeiZNdIWNcXXL'),
-('https://cdn.discordapp.com/emojis/230201364309868544.png', 'mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC');
+('https://cdn.discordapp.com/emojis/230201364309868544.png', 'mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC'),
+('https://cdn.discordapp.com/emojis/393635038903926784.gif', 'mxc://cadence.moe/WbYqNlACRuicynBfdnPYtmvc');
 
 INSERT INTO emoji (emoji_id, animated, mxc_url) VALUES
-('230201364309868544', 0, 'mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC');
+('230201364309868544', 0, 'mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC'),
+('393635038903926784', 1, 'mxc://cadence.moe/WbYqNlACRuicynBfdnPYtmvc');
 
 INSERT INTO member_cache (room_id, mxid, displayname, avatar_url) VALUES
 ('!kLRqKKUQXcibIMtOpl:cadence.moe', '@cadence:cadence.moe', 'cadence [they]', NULL),

m2d/converters/event-to-message.js

@@ -117,6 +117,28 @@ turndownService.addRule("inlineLink", {
 	}
 })
 
+turndownService.addRule("emoji", {
+	filter: function (node, options) {
+		if (node.nodeName !== "IMG" || !node.hasAttribute("data-mx-emoticon") || !node.getAttribute("src")) return false
+		const row = select("emoji", ["emoji_id", "animated"], "WHERE mxc_url = ?").get(node.getAttribute("src"))
+		if (!row) return false
+		node.setAttribute("data-emoji-id", row.emoji_id)
+		node.setAttribute("data-emoji-animated-char", row.animated ? "a" : "")
+		return true
+	},
+
+	replacement: function (content, node) {
+		/** @type {string} */
+		const id = node.getAttribute("data-emoji-id")
+		/** @type {string} */
+		const animatedChar = node.getAttribute("data-emoji-animated-char")
+		/** @type {string} */
+		const title = node.getAttribute("title") || "__"
+		const name = title.replace(/^:|:$/g, "")
+		return `<${animatedChar}:${name}:${id}>`
+	}
+})
+
 turndownService.addRule("fencedCodeBlock", {
 	filter: function (node, options) {
 		return (

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

@@ -1692,3 +1692,55 @@ test("event2message: stickers work", async t => {
 		}
 	)
 })
+
+test("event2message: static emojis work", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: ":hippo:",
+				format: "org.matrix.custom.html",
+				formatted_body: '<img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/qWmbXeRspZRLPcjseyLmeyXC\" title=\":hippo:\" alt=\":hippo:\">'
+			},
+			event_id: "$g07oYSZFWBkxohNEfywldwgcWj1hbhDzQ1sBAKvqOOU",
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe"
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "<:hippo:230201364309868544>",
+				avatar_url: undefined
+			}]
+		}
+	)
+})
+
+test("event2message: animated emojis work", async t => {
+	t.deepEqual(
+		await eventToMessage({
+			type: "m.room.message",
+			sender: "@cadence:cadence.moe",
+			content: {
+				msgtype: "m.text",
+				body: ":hippo:",
+				format: "org.matrix.custom.html",
+				formatted_body: '<img data-mx-emoticon height=\"32\" src=\"mxc://cadence.moe/WbYqNlACRuicynBfdnPYtmvc\" title=\":hipposcope:\" alt=\":hipposcope:\">'
+			},
+			event_id: "$g07oYSZFWBkxohNEfywldwgcWj1hbhDzQ1sBAKvqOOU",
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe"
+		}),
+		{
+			messagesToDelete: [],
+			messagesToEdit: [],
+			messagesToSend: [{
+				username: "cadence [they]",
+				content: "<a:hipposcope:393635038903926784>",
+				avatar_url: undefined
+			}]
+		}
+	)
+})