First pass

.gitignore

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+node_modules/
+test/bundle.js
+*~

index.js

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+var async = require('async');
+var loaderUtils = require('loader-utils');
+var sweet = require('sweet.js');
+
+module.exports = function(source) {
+  this.async();
+
+  var config = loaderUtils.parseQuery(this.query);
+
+  async.map(
+    config.modules || [],
+    function(module, callback) {
+      this.resolve(this.context, module, function(err, result) {
+	if (err) {
+	  callback(err);
+	  return;
+	}
+	try {
+	  callback(null, sweet.loadNodeModule(process.cwd(), result));
+	} catch (e) {
+	  callback(e);
+	}
+      });
+    }.bind(this),
+    function(err, results) {
+      if (err) {
+	this.callback(err);
+	return;
+      }
+      config.modules = results;
+      var result = sweet.compile(source, config);
+
+      this.cacheable && this.cacheable();
+      this.callback(null, result.code, result.sourceMap);
+    }.bind(this)
+  );
+};

package.json

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+{
+  "name": "sweetjs-loader",
+  "version": "0.0.0",
+  "description": "Loader for sweetjs macros",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "sweetjs",
+    "webpack"
+  ],
+  "author": "Pete Hunt",
+  "license": "Apache 2",
+  "dependencies": {
+    "sweet.js": "^0.5.0",
+    "loader-utils": "^0.2.1",
+    "async": "^0.2.10"
+  },
+  "devDependencies": {
+    "jasmine-node": "^1.14.2",
+    "webpack": "^1.1.0-beta9"
+  }
+}

test/basic.js

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+id(42)

test/macros.sjs

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+macro id {
+  rule {
+    // after the macro name, match:
+    // (1) a open paren 
+    // (2) a single token and bind it to `$x`
+    // (3) a close paren
+    ($x)
+  } => {
+    // just return the token that is bound to `$x`
+    $x
+  }
+}
+
+export id

test/sweet.spec.js

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+var fs = require('fs');
+var path = require('path');
+var webpack = require('webpack');
+
+describe('sweet-loader', function() {
+  it('should pretty much work', function() {
+    var BUNDLE_PATH = path.join(__dirname, 'bundle.js');
+
+    if (fs.existsSync(BUNDLE_PATH)) {
+      fs.unlinkSync(BUNDLE_PATH);
+    }
+
+    webpack({
+      cache: true,
+      entry: path.join(__dirname, 'basic.js'),
+      output: {
+	filename: BUNDLE_PATH
+      },
+      module: {
+	loaders: [
+	  {
+	    test: /\.js$/,
+	    loader: path.join(__dirname, '../index') + '?modules[]=' + path.join(__dirname, './macros.sjs')
+	  }
+	]
+      }
+    }, function(err, stats) {
+      console.log(err);
+    })
+  });
+});