refactor: add commandTransform utility (#2736)

commandTransform.js

@@ -0,0 +1,67 @@
+'use strict';
+const path = require('path');
+const fs = require('fs');
+const { argv } = require('process');
+
+const readFile = fs.promises.readFile;
+const writeFile = fs.promises.writeFile;
+const readdir = fs.promises.readdir;
+
+const loadScripts = async (readDir, writeDir) => {
+  const normalizedDir = path.normalize(readDir);
+
+  const files = await readdir(normalizedDir);
+
+  const luaFiles = files.filter(file => path.extname(file) === '.lua');
+  const writeFilenamePath = path.normalize(writeDir);
+
+  if (!fs.existsSync(writeFilenamePath)) {
+    fs.mkdirSync(writeFilenamePath);
+  }
+
+  let indexContent = "'use strict';\nmodule.exports = {\n";
+
+  if (luaFiles.length === 0) {
+    /**
+     * To prevent unclarified runtime error "updateDelayset is not a function
+     * @see https://github.com/OptimalBits/bull/issues/920
+     */
+    throw new Error('No .lua files found!');
+  }
+
+  for (let i = 0; i < luaFiles.length; i++) {
+    const completedFilename = path.join(normalizedDir, luaFiles[i]);
+    const longName = path.basename(luaFiles[i], '.lua');
+    indexContent += `  ["${longName}"]: require('./${longName}'),\n`;
+
+    await loadCommand(completedFilename, longName, writeFilenamePath);
+  }
+  indexContent += `}\n`;
+
+  await writeFile(path.join(writeFilenamePath, 'index.js'), indexContent);
+};
+
+const loadCommand = async (filename, longName, writeFilenamePath) => {
+  const filenamePath = path.resolve(filename);
+
+  const content = (await readFile(filenamePath)).toString();
+
+  const [name, num] = longName.split('-');
+  const numberOfKeys = num && parseInt(num, 10);
+
+  const newContent = `'use strict';
+const content = \`${content}\`;
+module.exports = {
+  name: '${name}',
+  content,${
+    numberOfKeys
+      ? `
+  keys: ${numberOfKeys},`
+      : ''
+  }
+};
+`;
+  await writeFile(path.join(writeFilenamePath, longName + '.js'), newContent);
+};
+
+loadScripts(argv[2], argv[3]);