Sync pins back from Matrix to Discord

src/m2d/actions/update-pins.js

@@ -0,0 +1,25 @@
+// @ts-check
+
+const {sync, from, discord} = require("../../passthrough")
+
+/** @type {import("../converters/diff-pins")} */
+const diffPins = sync.require("../converters/diff-pins")
+
+/**
+ * @param {string[]} pins
+ * @param {string[]} prev
+ */
+async function updatePins(pins, prev) {
+	const diff = diffPins.diffPins(pins, prev)
+	for (const [event_id, added] of diff) {
+		const row = from("event_message").join("message_channel", "message_id").where({event_id}).select("channel_id", "message_id").get()
+		if (!row) continue
+		if (added) {
+			discord.snow.channel.addChannelPinnedMessage(row.channel_id, row.message_id, "Message pinned on Matrix")
+		} else {
+			discord.snow.channel.removeChannelPinnedMessage(row.channel_id, row.message_id, "Message unpinned on Matrix")
+		}
+	}
+}
+
+module.exports.updatePins = updatePins