A version 0.4.0a of grunt-coffee, for you perusal

.gitignore

@@ -1,2 +1,4 @@
 /node_modules/
 tmp
+#*
+*~

Gruntfile.coffee

@@ -0,0 +1,61 @@
+module.exports = (grunt) ->
+
+    grunt.initConfig
+        pkg: grunt.file.readJSON('package.json')
+
+        jshint:
+            files: [ "src/**/*.js", "test/**/*.js" ]
+            options:
+                curly: true
+                eqeqeq: true
+                immed: true
+                latedef: true
+                newcap: true
+                noarg: true
+                sub: true
+                undef: true
+                boss: true
+                eqnull: true
+                node: true
+                es5: true
+
+            globals: {}
+
+        clean:
+            src: ["tmp/"]
+
+        coffee:
+            coffee:
+                files:
+                    "tasks/coffee.js": "src/coffee.coffee"
+                options:
+                    bare: false
+
+            test1:
+                files:
+                    "tmp/hello_world.js": ["test/fixtures/hello_world.coffee"]
+                options:
+                    bare: false
+
+            test2:
+                files:
+                    "tmp/hello_world_bare.js": "test/fixtures/hello_world.coffee"
+                options:
+                    bare: true
+
+        nodeunit:
+            files: [ "test/**/*.js" ]
+
+        watch:
+            files: "<config:jshint.files>"
+            tasks: "default"
+
+
+    grunt.loadTasks "tasks"
+
+    grunt.loadNpmTasks('grunt-contrib-watch');
+    grunt.loadNpmTasks('grunt-contrib-jshint');
+    grunt.loadNpmTasks('grunt-contrib-nodeunit');
+    grunt.loadNpmTasks('grunt-contrib-clean');
+
+    grunt.registerTask "default", ["coffee:coffee", "jshint", "coffee:test1", "coffee:test2", "nodeunit"]

package.json

@@ -11,6 +11,10 @@
     {
       "name": "Derek Lindahl",
       "url": "https://github.com/dlindahl"
+    },
+    {
+      "name": "Elf M. Sternberg",
+      "url": "https://github.com/elfsternberg"
     }
   ],
   "repository": {
@@ -34,12 +38,16 @@
     "test": "grunt test"
   },
   "dependencies": {
-    "grunt": "~0.3.8",
+    "grunt": "=0.4.0a",
     "coffee-script": "~1.3.1"
   },
   "devDependencies": {
-    "grunt": "~0.3.8",
-    "coffee-script": "~1.3.1"
+    "grunt": "~0.4.x",
+    "coffee-script": "~1.3.1",
+    "grunt-contrib-watch": "~0.1.4",
+    "grunt-contrib-nodeunit": "~0.1.1",
+    "grunt-contrib-jshint": "~0.1.0",
+    "grunt-contrib-clean": "~0.4.0a"
   },
   "keywords": [
     "gruntplugin"

src/coffee.coffee

@@ -0,0 +1,41 @@
+#
+# grunt-coffee
+# https://github.com/avalade/grunt-coffee
+#
+# Copyright (c) 2012 Aaron D. Valade
+# Licensed under the MIT license.
+#
+
+module.exports = (grunt) ->
+
+    helper = (src, destPath, options, extension) ->
+
+        coffee = require("coffee-script")
+        js = ""
+
+        extension = (if extension then extension else ".js")
+
+        dest = destPath
+        destPath = (if destPath then destPath else path.dirname(src))
+        if destPath.indexOf(extension, destPath.length - extension.length) == -1
+            dest = path.join(destPath, path.basename(src, ".coffee") + extension)
+
+        options = options or {}
+        options.bare = true  if options.bare isnt false
+
+        try
+            js = coffee.compile(grunt.file.read(src), options)
+            grunt.file.write dest, js
+        catch e
+            grunt.log.error "Error in " + src + ":\n" + e
+            false
+
+    path = require("path")
+
+    grunt.registerMultiTask "coffee", "Compile CoffeeScript files", ->
+        [dest, options, extension] = [@files.dest, @data.options, @data.extension]
+        @files.forEach (fileobj) ->
+            grunt.file.expand(fileobj.src, {filter: "isFile"}).forEach (filepath) ->
+                helper filepath, fileobj.dest, grunt.util._.clone(options), extension
+
+        (grunt.task.current.errorCount == 0)

tasks/coffee.js

@@ -1,59 +1,42 @@
-/*
- * grunt-coffee
- * https://github.com/avalade/grunt-coffee
- *
- * Copyright (c) 2012 Aaron D. Valade
- * Licensed under the MIT license.
- */
-
-module.exports = function(grunt) {
-  var path = require('path');
-
-  // Please see the grunt documentation for more information regarding task and
-  // helper creation: https://github.com/cowboy/grunt/blob/master/docs/toc.md
-
-  // ==========================================================================
-  // TASKS
-  // ==========================================================================
-
-  grunt.registerMultiTask('coffee', 'Compile CoffeeScript files', function() {
-    var dest = this.file.dest,
-        options = this.data.options,
-        extension = this.data.extension;
-
-    grunt.file.expandFiles(this.file.src).forEach(function(filepath) {
-      grunt.helper('coffee', filepath, dest, grunt.utils._.clone(options), extension);
+(function() {
+
+  module.exports = function(grunt) {
+    var helper, path;
+    helper = function(src, destPath, options, extension) {
+      var coffee, dest, js;
+      coffee = require("coffee-script");
+      js = "";
+      extension = (extension ? extension : ".js");
+      dest = destPath;
+      destPath = (destPath ? destPath : path.dirname(src));
+      if (destPath.indexOf(extension, destPath.length - extension.length) === -1) {
+        dest = path.join(destPath, path.basename(src, ".coffee") + extension);
+      }
+      options = options || {};
+      if (options.bare !== false) {
+        options.bare = true;
+      }
+      try {
+        js = coffee.compile(grunt.file.read(src), options);
+        return grunt.file.write(dest, js);
+      } catch (e) {
+        grunt.log.error("Error in " + src + ":\n" + e);
+        return false;
+      }
+    };
+    path = require("path");
+    return grunt.registerMultiTask("coffee", "Compile CoffeeScript files", function() {
+      var dest, extension, options, _ref;
+      _ref = [this.files.dest, this.data.options, this.data.extension], dest = _ref[0], options = _ref[1], extension = _ref[2];
+      this.files.forEach(function(fileobj) {
+        return grunt.file.expand(fileobj.src, {
+          filter: "isFile"
+        }).forEach(function(filepath) {
+          return helper(filepath, fileobj.dest, grunt.util._.clone(options), extension);
+        });
+      });
+      return grunt.task.current.errorCount === 0;
     });
+  };
 
-    if (grunt.task.current.errorCount) {
-      return false;
-    }
-  });
-
-  // ==========================================================================
-  // HELPERS
-  // ==========================================================================
-
-  grunt.registerHelper('coffee', function(src, destPath, options, extension) {
-    var coffee = require('coffee-script'),
-        js = '';
-
-    destPath = destPath ? destPath : path.dirname(src);
-    extension = extension ? extension : '.js';
-    var dest = path.join(destPath, path.basename(src, '.coffee') + extension);
-
-    options = options || {};
-    if( options.bare !== false ) {
-      options.bare = true;
-    }
-
-    try {
-      js = coffee.compile(grunt.file.read(src), options);
-      grunt.file.write(dest, js);
-    } catch (e) {
-      grunt.log.error("Error in " + src + ":\n" + e);
-      return false;
-    }
-  });
-
-};
+}).call(this);

test/coffee_test.js

@@ -1,85 +1,30 @@
+"use strict";
+
 var grunt = require('grunt'),
     fs = require('fs'),
-    path = require('path');
+    path = require('path'),
+    src = 'test/fixtures/hello_world.coffee',
+    destFolder = 'tmp/';
 
 fs.existsSync = fs.existsSync ? fs.existsSync : path.existsSync;
 
-/*
-  ======== A Handy Little Nodeunit Reference ========
-  https://github.com/caolan/nodeunit
-
-  Test methods:
-    test.expect(numAssertions)
-    test.done()
-  Test assertions:
-    test.ok(value, [message])
-    test.equal(actual, expected, [message])
-    test.notEqual(actual, expected, [message])
-    test.deepEqual(actual, expected, [message])
-    test.notDeepEqual(actual, expected, [message])
-    test.strictEqual(actual, expected, [message])
-    test.notStrictEqual(actual, expected, [message])
-    test.throws(block, [error], [message])
-    test.doesNotThrow(block, [error], [message])
-    test.ifError(value)
-*/
+exports.coffee = {
 
-var src = 'test/fixtures/hello_world.coffee';
-var destFolder = 'tmp/js';
-var dest1 = 'test/fixtures/hello_world.js';
-var dest2 = 'test/fixtures/hello_world.coffee.js';
-
-exports['coffee'] = {
   setUp: function(done) {
     done();
   },
 
-  tearDown: function(done) {
-    if (fs.existsSync(destFolder)) {
-      if ( fs.existsSync(destFolder + '/hello_world.js') ) {
-        fs.unlinkSync(destFolder + '/hello_world.js');
-      }
-      fs.rmdirSync(destFolder);
-    }
-
-    if (fs.existsSync(dest1)) {
-      fs.unlinkSync(dest1);
-    }
-    if (fs.existsSync(dest2)) {
-      fs.unlinkSync(dest2);
-    }
-    done();
-  },
-
-  'helper': function(test) {
+  'task': function(test) {
     test.expect(2);
 
-    grunt.helper('coffee', [src], destFolder);
-    test.equal(grunt.file.read(destFolder + '/hello_world.js'),
+    test.equal(grunt.file.read(destFolder + '/hello_world_bare.js'),
                '\nconsole.log("Hello CoffeeScript!");\n',
                'it should compile the coffee');
 
-    grunt.helper('coffee', [src], destFolder, { bare:false });
     test.equal(grunt.file.read(destFolder + '/hello_world.js'),
                '(function() {\n\n  console.log("Hello CoffeeScript!");\n\n}).call(this);\n',
                'it should compile the coffee');
 
     test.done();
-  },
-
-  'helper-nodest': function(test) {
-    test.expect(1);
-    grunt.helper('coffee', [src]);
-    test.equal(grunt.file.read(dest1),
-               '\nconsole.log("Hello CoffeeScript!");\n',
-               'it should compile the coffee');
-    test.done();
-  },
-
-  'helper-extension': function(test) {
-    test.expect(1);
-    grunt.helper('coffee', [src], null, {}, '.coffee.js');
-    test.ok(fs.existsSync(dest2));
-    test.done();
   }
 };