pokemon-showdown

#!/usr/bin/env node

// Before running, ensure that the Typescript files have been compiled.
//
// Simply doing `require('../build')` here doesn't work because the `replace`
// step of the build is asynchronous and we can't wait for it to finish easily
// unless we shell out and use `execSync`. However, the heuristic of simply
// checking for the presence of  './.sim-dist/dex' to determine whether a build
// is required is somewhat risky as it only is valid from a clean repository -
// if you make edits or have previous build artifacts lying around, this
// script could potentially be missing additional sources or the compiled output
// may be out of date.
//
// We're OK with risking being stale here unless we're starting the server
// because we want to keep this script as fast as possible to be usable as a way
// of interfacing with the simulator from non-JS languages. Otherwise we error
// on the side of caution and run `node build` to ensure we're always running
// with the latest code.
var built = false;
function build() {
	require('child_process').execSync('node build', {stdio: 'inherit', cwd: __dirname});
	built = true;
}

function readTeam(stream) {
	return stream.readLine().then(line => {
		if (line.startsWith('[') || line.includes('|')) return line;
		return stream.readAll().then(all => (line + '\n' + all));
	});
}


function installDependencies() {
	console.log(`Installing dependencies...`);
	require('child_process').execSync('npm install --production', {stdio: 'inherit'});
}

function registerTSNode() {
	require('ts-node').register({project: './tsconfig.json', files: true, transpileOnly: true, transpiler: 'ts-node/transpilers/swc-experimental'});
}

// enable require()ing TypeScript files
function setupTSNode() {
	try {
		registerTSNode();
	} catch (e) {
		installDependencies();
		registerTSNode();
	}
}

function ensureSucraseIsInstalled() {
	try {
		const sucraseVersion = require('sucrase').getVersion().split('.');
		if (
			parseInt(sucraseVersion[0]) < 3 ||
			(parseInt(sucraseVersion[0]) === 3 && parseInt(sucraseVersion[1]) < 12)
		) {
			throw new Error("Sucrase version too old");
		}
	} catch (e) {
		installDependencies();
	}
}

function sucraseBuild() {
	ensureSucraseIsInstalled();
	try {
		require.resolve('./.sim-dist/dex');
	} catch (err) {
		if (err.code !== 'MODULE_NOT_FOUND') throw err; // should never happen
		build();
	}
}

if (!process.argv[2] || /^[0-9]+$/.test(process.argv[2])) {
	// Start the server.
	//
	// The port the server should host on can be passed using the second argument
	// when launching with this file the same way app.js normally allows, e.g. to
	// host on port 9000:
	// $ ./pokemon-showdown 9000
	setupTSNode();
	require('module')._load('./server', module, true);
} else switch (process.argv[2]) {
	case 'help':
	case 'h':
	case '?':
	case '-h':
	case '--help':
	case '-?':
		console.log('pokemon-showdown start [--skip-build] [PORT]');
		console.log('');
		console.log('  Starts a PS server on the specified port');
		console.log('  (Defaults to the port setting in config/config.js)');
		console.log('  (The port setting in config/config.js defaults to 8000)');
		console.log('');
		console.log('pokemon-showdown generate-team [FORMAT-ID [RANDOM-SEED]]');
		console.log('');
		console.log('  Generates a random team, and writes it to stdout in packed team format');
		console.log('  (Format defaults to "gen7randombattle")');
		console.log('');
		console.log('pokemon-showdown validate-team [FORMAT-ID]');
		console.log('');
		console.log('  Reads a team from stdin, and validates it');
		console.log('  If valid: exits with code 0');
		console.log('  If invalid: writes errors to stderr, exits with code 1');
		console.log('');
		console.log('pokemon-showdown simulate-battle');
		console.log('');
		console.log('  Simulates a battle, taking input to stdin and writing output to stdout');
		console.log('  Protocol is documented in ./.sim-dist/README.md');
		console.log('');
		console.log('pokemon-showdown json-team');
		console.log('');
		console.log('  Reads a team in any format from stdin, writes the unpacked JSON to stdout');
		console.log('');
		console.log('pokemon-showdown pack-team');
		console.log('');
		console.log('  Reads a team in any format from stdin, writes the packed team to stdout');
		console.log('');
		console.log('pokemon-showdown export-team');
		console.log('');
		console.log('  Reads a team in any format from stdin, writes the exported (human-readable) team to stdout');
		console.log('');
		console.log('pokemon-showdown help');
		console.log('');
		console.log('  Displays this reference');
		break;
	case 'start':
		{
			process.argv.splice(2, 1);
			setupTSNode();
			require('module')._load('./server', module, true);
			break;
		}
	case 'generate-team':
		{
			sucraseBuild();
			var Teams = require('./.sim-dist/teams').Teams;
			var seed = process.argv[4] ? process.argv[4].split(',').map(Number) : undefined;
			console.log(Teams.pack(Teams.generate(process.argv[3], {seed})));
		}
		break;
	case 'validate-team':
		{
			sucraseBuild();
			var Teams = require('./.sim-dist/teams').Teams;
			var TeamValidator = require('./.sim-dist/team-validator').TeamValidator;
			var validator = TeamValidator.get(process.argv[3]);
			var Streams = require('./.lib-dist/streams');
			var stdin = Streams.stdin();

			readTeam(stdin).then(function (textTeam) {
				try {
					var team = Teams.import(textTeam);
					var result = validator.validateTeam(team);
					if (result) {
						console.error(result.join('\n'));
						process.exit(1);
					}
					process.exit(0);
				} catch (e) {
					console.error(e);
					process.exit(1);
				}
			});
		}
		break;
	case 'simulate-battle':
		{
			sucraseBuild();
			var BattleTextStream = require('./.sim-dist/battle-stream').BattleTextStream;
			var Streams = require('./.lib-dist/streams');
			var stdin = Streams.stdin();
			var stdout = Streams.stdout();

			var args = process.argv.slice(3);

			var options = args.flatMap(function (arg) {
				if (arg.charAt(0) !== '-') {
					if (arg) console.error("Invalid parameter: " + arg);
					return [];
				} else if (arg.charAt(1) === '-') {
					return arg.slice(2);
				} else {
					return Array.from(arg.slice(1));
				}
			});

			var debug = false;
			var replay = false;
			var spectate = false;
			for (var i = 0; i < options.length; i++) {
				switch (options[i]) {
				case 'debug': case 'D':
					debug = true;
					break;
				case 'replay': case 'R':
					replay = true;
					break;
				case 'spectate': case 'spectator': case 'S':
					replay = true;
					spectate = true;
					break;
				default:
					console.error("Invalid option: " + options[i]);
					break;
				}
			}

			var battleStream = new BattleTextStream({
				noCatch: true,
				debug: debug,
				replay: spectate ? 'spectator' : replay,
			});
			stdin.pipeTo(battleStream);
			battleStream.pipeTo(stdout);
		}
		break;
	case 'unpack-team':
	case 'json-team':
		{
			sucraseBuild();
			var Teams = require('./.sim-dist/teams').Teams;
			var Streams = require('./.lib-dist/streams');
			var stdin = Streams.stdin();

			readTeam(stdin).then(function (team) {
				try {
					var unpackedTeam = Teams.unpack(Teams.import(team));
					console.log(JSON.stringify(unpackedTeam));
					process.exit(0);
				} catch (e) {
					console.error(e);
					process.exit(1);
				}
			});
		}
		break;
	case 'pack-team':
		{
			sucraseBuild();
			var Teams = require('./.sim-dist/teams').Teams;
			var Streams = require('./.lib-dist/streams');
			var stdin = Streams.stdin();

			readTeam(stdin).then(function (team) {
				try {
					var packedTeam = Teams.pack(Teams.import(team));
					console.log(packedTeam);
					process.exit(0);
				} catch (e) {
					console.error(e);
					process.exit(1);
				}
			});
		}
		break;
	case 'export-team':
		{
			sucraseBuild();
			var Teams = require('./.sim-dist/teams').Teams;
			var Streams = require('./.lib-dist/streams');
			var stdin = Streams.stdin();

			readTeam(stdin).then(function (team) {
				try {
					var exportedTeam = Teams.export(Teams.import(team));
					console.log(exportedTeam);
					process.exit(0);
				} catch (e) {
					console.error(e);
					process.exit(1);
				}
			});
		}
		break;
	default:
		console.error('Unrecognized command: ' + process.argv[2]);
		console.error('Use `pokemon-showdown help` for help');
		process.exit(1);
}