feat: first pass, good enough

.eslintrc.js

@@ -0,0 +1,16 @@
+module.exports = {
+  env: {
+    es2021: true,
+    node: true,
+  },
+  extends: 'airbnb-base',
+  overrides: [
+  ],
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+  },
+  rules: {
+    'no-console': 'off',
+  },
+};

README.md

@@ -1,2 +1,17 @@
-# gmenu2x-aliasfile-generator
-Generates a gmenu2x aliasfile from a directory of files
+# GMenu2X aliasfile generator
+
+Generates a GMenu2X aliasfile from a directory of files
+
+## Usage
+
+Generate to standard out:
+
+```shell
+npm start -- --directory /path/to/roms
+```
+
+Pipe it to an aliasfile:
+
+```shell
+npm start -- -d /path/to/roms > /path/to/aliasfile
+```

package.json

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+{
+  "name": "gmenu2x-aliasfile-generator",
+  "version": "1.0.0",
+  "description": "Generates a gmenu2x aliasfile from a directory of files",
+  "main": "src/index.mjs",
+  "module": true,
+  "scripts": {
+    "start": "node src/index.mjs"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/joshtronic/gmenu2x-aliasfile-generator.git"
+  },
+  "author": "Josh Sherman <hello@joshtronic.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/joshtronic/gmenu2x-aliasfile-generator/issues"
+  },
+  "homepage": "https://github.com/joshtronic/gmenu2x-aliasfile-generator#readme",
+  "devDependencies": {
+    "eslint": "^8.36.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-plugin-import": "^2.27.5"
+  },
+  "dependencies": {
+    "commander": "^10.0.0",
+    "mkdirp": "^2.1.5"
+  }
+}

src/index.mjs

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+import { promises as fs } from 'fs';
+import { program } from 'commander';
+
+program
+  .requiredOption('-d, --directory <path>', 'directory to read')
+  .parse();
+
+const { directory } = program.opts();
+
+const files = await fs.readdir(directory);
+
+files.forEach((file) => {
+  let alias = file.slice(0, file.lastIndexOf('.'));
+
+  // Awesome gist that inspired most of the following:
+  // https://gist.github.com/ramiabraham/ff41ba74f2b7104ecece
+  alias = alias
+    // Removes primary ROM codes
+    .replace(/\[(a|p|b|f|T-|T+|t|h|o|J|!)\]/gi, '')
+    .replace(/\((-|M\d+|U|E|UE)\)/gi, '')
+    // TODO: Stripe checksums - (###)
+    // Removes country codes
+    .replace(/\((1|4|A|J|B|K|C|NL|E|PD|F|S|F|FC|SW|FN|U|G|UK|GR|Unk|HK|I|H|Unl)\)/gi, '')
+    // Removes Nintendo Game Boy specific codes
+    .replace(/\[(C|S|BF)\]/gi, '')
+    // Removes Super Nintendo Entertainment System specific codes
+    .replace(/\((BS|ST|NP)\)/gi, '')
+    // Removes Sega Genesis specific codes
+    .replace(/\((1|4|5|8)\)/gi, '')
+    .replace(/\[ (\(B\) Brazil|\[c\] Checksum|\[x\] Bad Checksum|\[R-\] Countries) \]/gi, '')
+    // Removes Nintendo Entertainment System specific codes
+    .replace(/\[(PC10|VS)\]/gi, '');
+
+  console.log(`${file}=${alias}`);
+});