fix(swingset): Finish vat tool RESM to NESM conversion

packages/SwingSet/bin/rekernelize

@@ -0,0 +1 @@
+../tools/rekernelize.js

packages/SwingSet/bin/vat

@@ -0,0 +1 @@
+../tools/vat.js

packages/SwingSet/tools/vat.js

@@ -0,0 +1,63 @@
+#!/usr/bin/env node
+
+// TODO Remove babel-standalone preinitialization
+// https://github.com/endojs/endo/issues/768
+import '@agoric/babel-standalone';
+import '@agoric/install-ses';
+import process from 'process';
+import repl from 'repl';
+import util from 'util';
+import { loadBasedir, buildVatController } from '../src/index.js';
+import { buildLoopbox } from '../src/devices/loopbox.js';
+
+function deepLog(item) {
+  console.log(util.inspect(item, false, null, true));
+}
+
+async function main() {
+  const argv = process.argv.splice(2);
+  let withSES = true;
+  if (argv[0] === '--no-ses') {
+    withSES = false;
+    argv.shift();
+  }
+  const command = argv.shift();
+  if (command !== 'run' && command !== 'shell') {
+    throw new Error(`use 'vat run' or 'vat shell', not 'vat ${command}'`);
+  }
+  const basedir =
+    argv[0] === '--' || argv[0] === undefined ? '.' : argv.shift();
+  const vatArgv = argv[0] === '--' ? argv.slice(1) : argv;
+
+  const config = await loadBasedir(basedir);
+  const { loopboxSrcPath, loopboxEndowments } = buildLoopbox('immediate');
+  config.devices = [['loopbox', loopboxSrcPath, loopboxEndowments]];
+
+  const controller = await buildVatController(config, withSES, vatArgv);
+  if (command === 'run') {
+    await controller.run();
+    console.log('= vat finished');
+  } else if (command === 'shell') {
+    const r = repl.start({ prompt: 'vat> ', replMode: repl.REPL_MODE_STRICT });
+    r.context.dump = () => {
+      const d = controller.dump();
+      console.log('Kernel Table:');
+      deepLog(d.kernelTable);
+      console.log('Promises:');
+      deepLog(d.promises);
+      console.log('Run Queue:');
+      deepLog(d.runQueue);
+    };
+    r.context.dump2 = () => controller.dump();
+    r.context.run = () => {
+      console.log('run!');
+      controller.run();
+    };
+    r.context.step = () => {
+      console.log('step!');
+      controller.step();
+    };
+  }
+}
+
+main();