Minifier for hackmud

README.txt

Usage:

* Start in your hackmud scripts folder.
* Make your folder structure look like this:

package.json
lib/compile.js
lib/watch.js
src/

* Put source files in src/
* npm install
  (except wait, aren't the cool kids using Yarn now?)
* npm start
* Enjoy debugging minified files

compile.js

const babel = require('babel-core');

module.exports = function compile(src, options = {}) {
	let autos = /^function.*(\/\/.*)/.exec(src);
	if (autos) {
		autos = autos[1];
	}

	src = src
		.replace(/#s\.([\w\d_]+)\.([\w\d_]+)/g, 'SC$$$1$$$2')
		.replace(/#db\.i/g, 'DB_insert')
		.replace(/#db\.f/g, 'DB_find_cursor')
		.replace(/#db\.u1/g, 'DB_update_one')
		.replace(/#db\.u/g, 'DB_update')
		.replace(/#db\.r/g, 'DB_remove')
		.replace(/^function/, 'export default function');

	let { code } = babel.transform(src, {
		minified: true,
		shouldPrintComment: value => value.indexOf('@auto') >= 0,
		plugins: [
			"babel-plugin-minify-constant-folding",
			"babel-plugin-minify-dead-code-elimination",
			"babel-plugin-minify-flip-comparisons",
			"babel-plugin-minify-guarded-expressions",
			"babel-plugin-minify-infinity",
			"babel-plugin-minify-mangle-names",
			"babel-plugin-minify-replace",
			// "babel-plugin-minify-simplify", // waiting for release of https://github.com/babel/babili/pull/202
			"babel-plugin-minify-type-constructors",
			"babel-plugin-transform-member-expression-literals",
			"babel-plugin-transform-merge-sibling-variables",
			"babel-plugin-transform-minify-booleans",
			"babel-plugin-transform-property-literals",
			"babel-plugin-transform-simplify-comparison-operators",
			"babel-plugin-transform-undefined-to-void",
			[replaceIdentifier, {
				"Array": "ARRAY",
				"Date": "DATE",
				"Error": "ERROR",
				"JSON": "JSON_",
				"Object": "OBJECT",
				"String": "STRING",
			}]
		]
	});

	code = code
		.replace(/SC\$([\w\d_]+)\$([\w\d_]+)/g, '#s.$1.$2')
		.replace(/DB_insert/g, '#db.i')
		.replace(/DB_find_cursor/g, '#db.f')
		.replace(/DB_update_one/g, '#db.u1')
		.replace(/DB_update/g, '#db.u')
		.replace(/DB_remove/g, '#db.r')
		.replace(/export default (function\s*\([^)]*\)\s*{)/,
			autos ? '$1 ' + autos + '\n' :
			'$1');
	return code;
}

function replaceIdentifier({ types: t }) {
	return {
		visitor: {
			Identifier(path, state) {
				const newId = state.opts[path.node.name]
				if (newId) {
					path.replaceWith(t.identifier(newId))
				}
			}
		}
	};
}

package.json

{
  "name": "hackmud-scripts",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "start": "node lib/watch",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Greg Smith <[email protected]>",
  "license": "MIT",
  "devDependencies": {
    "babel-core": "^6.18.0",
    "babel-plugin-minify-constant-folding": "^0.0.1",
    "babel-plugin-minify-dead-code-elimination": "^0.0.4",
    "babel-plugin-minify-flip-comparisons": "^0.0.1",
    "babel-plugin-minify-guarded-expressions": "^0.0.3",
    "babel-plugin-minify-infinity": "^0.0.1",
    "babel-plugin-minify-mangle-names": "^0.0.3",
    "babel-plugin-minify-numeric-literals": "^0.0.1",
    "babel-plugin-minify-replace": "^0.0.1",
    "babel-plugin-minify-simplify": "^0.0.3",
    "babel-plugin-minify-type-constructors": "^0.0.1",
    "babel-plugin-transform-member-expression-literals": "^6.8.0",
    "babel-plugin-transform-merge-sibling-variables": "^6.8.0",
    "babel-plugin-transform-minify-booleans": "^6.8.0",
    "babel-plugin-transform-property-literals": "^6.8.0",
    "babel-plugin-transform-simplify-comparison-operators": "^6.8.0",
    "babel-plugin-transform-undefined-to-void": "^6.8.0",
    "chokidar": "^1.6.1",
    "glob": "^7.1.1"
  }
}

watch.js

const fs = require('fs');
const path = require('path');
const babel = require('babel-core');
const chokidar = require('chokidar');

const compile = require('./compile');

chokidar.watch('src/*.js', { ignored: '**/*.test.js'})
	.on('add', compileFile)
	.on('change', compileFile)
	.on('unlink', removeCompiledFile);

function compileFile(file) {
	console.log(`Compiling ${file}`);
	let src = fs.readFileSync(file, 'utf-8');
	try {
		let result = compile(src, {});
		fs.writeFileSync(path.basename(file), result);
		console.log('Done.');
	} catch (err) {
		console.error(err);
	}
}

function removeCompiledFile(file) {
	console.log(`Removing ${file}`);
	try {
		fs.unlinkSync(path.basename(file));
		console.log('Done.');
	} catch (err) {
		console.error(err);
	}
}