explain inflight thread room creation

d2m/actions/announce-thread.js

@@ -0,0 +1,44 @@
+// @ts-check
+
+const assert = require("assert")
+
+const passthrough = require("../../passthrough")
+const { discord, sync, db } = passthrough
+/** @type {import("../converters/message-to-event")} */
+const messageToEvent = sync.require("../converters/message-to-event")
+/** @type {import("../../matrix/api")} */
+const api = sync.require("../../matrix/api")
+/** @type {import("./register-user")} */
+const registerUser = sync.require("./register-user")
+/** @type {import("../actions/create-room")} */
+const createRoom = sync.require("../actions/create-room")
+
+/**
+ * @param {string} parentRoomID
+ * @param {string} threadRoomID
+ * @param {import("discord-api-types/v10").APIThreadChannel} thread
+ */
+async function announceThread(parentRoomID, threadRoomID, thread) {
+   /** @type {string?} */
+   const creatorMxid = db.prepare("SELECT mxid FROM sim WHERE discord_id = ?").pluck().get(thread.owner_id)
+   /** @type {string?} */
+   const branchedFromEventID = db.prepare("SELECT event_id FROM event_message WHERE message_id = ?").get(thread.id)
+
+   const msgtype = creatorMxid ? "m.emote" : "m.text"
+   const template = creatorMxid ? "started a thread:" : "Thread started:"
+   let body = `${template} ${thread.name} https://matrix.to/#/${threadRoomID}`
+   let html = `${template} <a href="https://matrix.to/#/${threadRoomID}">${thread.name}</a>`
+
+   const mentions = {}
+
+   await api.sendEvent(parentRoomID, "m.room.message", {
+      msgtype,
+      body: `${template} ,
+      format: "org.matrix.custom.html",
+      formatted_body: "",
+      "m.mentions": mentions
+
+   }, creatorMxid)
+}
+
+module.exports.announceThread = announceThread