refactor: internal packages structure (#94)

* refactor: internal packages structure

* refactor: internal packages structure

commands/serve/lib/serve.js

@@ -0,0 +1,78 @@
+const path = require('path');
+const fs = require('fs');
+const chalk = require('chalk');
+const portfinder = require('portfinder');
+const { watch } = require('@nebula.js/cli-build');
+
+const webpackServe = require('./webpack.serve.js');
+
+const { startEngine, stopEngine } = require('./engine');
+
+module.exports = async argv => {
+  if (process.env.ACCEPT_EULA === 'yes') {
+    await startEngine();
+  }
+  const port = argv.port || (await portfinder.getPortPromise());
+  const host = argv.host || 'localhost';
+  const enigmaConfig = {
+    port: 9076,
+    host: 'localhost',
+    ...argv.enigma,
+  };
+  const context = process.cwd();
+  let snPath;
+  let snName;
+  let watcher;
+  if (argv.entry) {
+    snPath = path.resolve(context, argv.entry);
+    const parsed = path.parse(snPath);
+    snName = parsed.name;
+  } else {
+    if (argv.build !== false) {
+      watcher = await watch();
+    }
+    try {
+      const externalPkg = require(path.resolve(context, 'package.json')); // eslint-disable-line global-require
+      const externalEntry = externalPkg.module || externalPkg.main;
+      snName = externalPkg.name;
+      snPath = path.resolve(context, externalEntry);
+    } catch (e) {
+      //
+    }
+  }
+  if (!fs.existsSync(snPath)) {
+    const rel = path.relative(context, snPath);
+    console.log(chalk.red(`The specified entry point ${chalk.yellow(rel)} does not exist`));
+    return;
+  }
+
+  const server = await webpackServe({
+    host,
+    port,
+    enigmaConfig,
+    snName,
+    snPath,
+    dev: process.env.MONO === 'true',
+    open: argv.open !== false,
+    watcher,
+  });
+
+  const close = () => {
+    if (process.env.ACCEPT_EULA === 'yes') {
+      stopEngine();
+    }
+    if (watcher) {
+      watcher.close();
+    }
+    server.close();
+  };
+
+  ['SIGINT', 'SIGTERM'].forEach(signal => {
+    process.on(signal, close);
+  });
+
+  return { //eslint-disable-line
+    url: server.url,
+    close,
+  };
+};