Implement main game as a mod

server/game/load_mods.ts

@@ -0,0 +1,59 @@
+// starts a game server with its mods: registers their data, then imports worldgen and server scripts.
+// the worker loads built mods, tests can load mods straight from their source folders
+import { register_mod_data } from "$/common/mod_loader.ts";
+import type { ModData, ModListing } from "$/common/mod_loader.ts";
+import { load_worldgen } from "$/common/worldgen_loader.ts";
+import { add_base_item_hooks } from "./blocks.ts";
+import { GameHost, GameServer } from "./game_server.ts";
+import { ModRuntime } from "./mod_runtime.ts";
+
+export interface ServerModSource {
+	listing: ModListing;
+	data: ModData;
+	// importable urls of the scripts: data: urls in the worker, file urls in tests
+	server_url?: string;
+	worldgen_url?: string;
+}
+
+export async function start_game(
+	host: GameHost,
+	save: string | undefined,
+	default_seed: string,
+	mods: ServerModSource[],
+): Promise<GameServer> {
+	const recipes = register_mod_data(mods.map((mod) => ({ id: mod.listing.id, data: mod.data })));
+	add_base_item_hooks();
+
+	const worldgen_scripts = mods.flatMap((mod) =>
+		mod.worldgen_url ? [{ mod: mod.listing.id, url: mod.worldgen_url }] : []
+	);
+	const worldgen = await load_worldgen(worldgen_scripts, recipes.ores);
+
+	const runtime = new ModRuntime();
+	const game = new GameServer(host, save, default_seed, {
+		listings: mods.map((mod) => mod.listing),
+		recipes,
+		worldgen,
+		runtime,
+	});
+
+	await runtime.load_scripts(
+		game,
+		mods.flatMap((mod) =>
+			mod.server_url ? [{ mod: mod.listing.id, version: mod.listing.version, url: mod.server_url }] : []
+		),
+	);
+	runtime.finish_setup();
+	runtime.after.server_start.emit({});
+
+	return game;
+}
+
+export function data_url(code: string) {
+	const bytes = new TextEncoder().encode(code);
+	let binary = "";
+	for (let i = 0; i < bytes.length; i += 0x8000) {
+		binary += String.fromCharCode(...bytes.subarray(i, i + 0x8000));
+	}
+	return `data:application/javascript;base64,${btoa(binary)}`;
+}