Implement chathistory support

lib/client.js

@@ -2,7 +2,15 @@ import * as irc from "./irc.js";
 
 // Static list of capabilities that are always requested when supported by the
 // server
-const permanentCaps = ["message-tags", "server-time", "multi-prefix", "away-notify", "echo-message"];
+const permanentCaps = [
+	"away-notify",
+	"batch",
+	"draft/chathistory",
+	"echo-message",
+	"message-tags",
+	"multi-prefix",
+	"server-time",
+];
 
 export default class Client extends EventTarget {
 	ws = null;
@@ -18,6 +26,7 @@ export default class Client extends EventTarget {
 	registered = false;
 	availableCaps = {};
 	enabledCaps = {};
+	batches = new Map();
 
 	constructor(params) {
 		super();
@@ -65,6 +74,15 @@ export default class Client extends EventTarget {
 		var msg = irc.parseMessage(event.data);
 		console.log("Received:", msg);
 
+		var msgBatch = null;
+		if (msg.tags["batch"]) {
+			msgBatch = this.batches.get(msg.tags["batch"]);
+			if (msgBatch) {
+				msgBatch.messages.push(msg);
+			}
+		}
+
+		var deleteBatch = null;
 		switch (msg.command) {
 		case irc.RPL_WELCOME:
 			if (this.params.saslPlain && this.availableCaps["sasl"] === undefined) {
@@ -115,11 +133,33 @@ export default class Client extends EventTarget {
 				this.nick = newNick;
 			}
 			break;
+		case "BATCH":
+			var enter = msg.params[0].startsWith("+");
+			var name = msg.params[0].slice(1);
+			if (enter) {
+				var batch = {
+					name,
+					type: msg.params[1],
+					params: msg.params.slice(2),
+					parent: msgBatch,
+					messages: [],
+				};
+				this.batches.set(name, batch);
+			} else {
+				deleteBatch = name;
+			}
+			break;
 		}
 
 		this.dispatchEvent(new CustomEvent("message", {
-			detail: { message: msg },
+			detail: { message: msg, batch: msgBatch },
 		}));
+
+		// Delete after firing the message event so that handlers can access
+		// the batch
+		if (deleteBatch) {
+			this.batches.delete(name);
+		}
 	}
 
 	addAvailableCaps(s) {