cli: Implement storage migrate subcommand

This introduces the ability to run the migration offline, while
TL is not running as the migrations can take a long time.

The migrate command is added as a `thelounge storage` subcommand.
Reason being that it is expected that more subcommands will follow,
say `thelounge storage clean` to remove partial data from the db.

server/command-line/index.ts

@@ -42,6 +42,7 @@ program.addCommand(require("./install").default);
 program.addCommand(require("./uninstall").default);
 program.addCommand(require("./upgrade").default);
 program.addCommand(require("./outdated").default);
+program.addCommand(require("./storage").default);
 
 if (!Config.values.public) {
 	require("./users").default.forEach((command: Command) => {

server/command-line/storage.ts

@@ -0,0 +1,51 @@
+import log from "../log";
+import {Command} from "commander";
+import ClientManager from "../clientManager";
+import Utils from "./utils";
+import SqliteMessageStorage from "../plugins/messageStorage/sqlite";
+
+const program = new Command("storage").description(
+	"various utilities related to the message storage"
+);
+
+program
+	.command("migrate")
+	.argument("[user]", "migrate a specific user only, all if not provided")
+	.description("Migrate message storage where needed")
+	.on("--help", Utils.extraHelp)
+	.action(function (user) {
+		runMigrations(user).catch((err) => {
+			log.error(err.toString());
+			process.exit(1);
+		});
+	});
+
+async function runMigrations(user: string) {
+	const manager = new ClientManager();
+	const users = manager.getUsers();
+
+	if (user) {
+		if (!users.includes(user)) {
+			throw new Error(`invalid user ${user}`);
+		}
+
+		return migrateUser(user);
+	}
+
+	for (const name of users) {
+		await migrateUser(name);
+		// if any migration fails we blow up,
+		// chances are the rest won't complete either
+	}
+}
+
+// runs sqlite migrations for a user, which must exist
+async function migrateUser(user: string) {
+	log.info("handling user", user);
+	const sqlite = new SqliteMessageStorage(user);
+	await sqlite.enable(); // enable runs migrations
+	await sqlite.close();
+	log.info("user", user, "migrated successfully");
+}
+
+export default program;