Implement liftoff into grunt-cli

bin/grunt

@@ -4,41 +4,48 @@
 
 process.title = 'grunt';
 
-// Especially badass external libs.
-var findup = require('findup-sync');
-var resolve = require('resolve').sync;
-
-// Internal libs.
-var options = require('../lib/cli').options;
-var completion = require('../lib/completion');
-var info = require('../lib/info');
-var path = require('path');
-
-var basedir = process.cwd();
-var gruntpath;
-
-// Do stuff based on CLI options.
-if ('completion' in options) {
-  completion.print(options.completion);
-} else if (options.version) {
-  info.version();
-} else if (options.gruntfile) { //Note: if both `gruntfile` and `base` are set, use `gruntfile`
-  basedir = path.resolve(path.dirname(options.gruntfile));
-} else if (options.base) {
-  basedir = path.resolve(options.base);
-}
-
-try {
-  gruntpath = resolve('grunt', {basedir: basedir});
-} catch (ex) {
-  gruntpath = findup('lib/grunt.js');
-  // No grunt install found!
-  if (!gruntpath) {
-    if (options.version) { process.exit(); }
-    if (options.help) { info.help(); }
-    info.fatal('Unable to find local grunt.', 99);
+var Liftoff = require('liftoff');
+var v8flags = require('v8flags');
+var extensions = require('interpret').jsVariants;
+var nopt = require('nopt');
+var gruntOptions = require('grunt-known-options');
+var completion = require('../lib/completion.js');
+
+// Parse `gruntOptions` into a form that nopt can handle.
+var aliases = {};
+var known = {};
+
+Object.keys(gruntOptions).forEach(function(key) {
+  var short = gruntOptions[key].short;
+  if (short) {
+    aliases[short] = '--' + key;
   }
-}
-
-// Everything looks good. Require local grunt and run it.
-require(gruntpath).cli();
+  known[key] = gruntOptions[key].type;
+});
+
+// Parse them and return an options object.
+var options = nopt(known, aliases, process.argv, 2);
+
+v8flags(function (err, v8flags) {
+  var Grunt = new Liftoff({
+    name: 'grunt',
+    configName: 'Gruntfile',
+    // Support a number of languages based on file extension
+    extensions: extensions,
+    // Flags that are v8 flags will be loaded into node instead of Gruntfile
+    v8flags: v8flags
+  });
+  Grunt.launch({
+    cwd: options.cwd,
+    configPath: options.gruntfile,
+    require: options.require,
+    completion: completion,
+    verbose: options.verbose
+  }, function (env) {
+    var tasks = options.argv.remain;
+    delete options.argv;
+    options.gruntfile = env.configPath;
+    var grunt = require(env.modulePath);
+    grunt.tasks(tasks, options);
+  });
+});

package.json

@@ -15,14 +15,15 @@
     "grunt": "bin/grunt"
   },
   "dependencies": {
-    "findup-sync": "~0.3.0",
-    "grunt-known-options": "~1.1.0",
-    "nopt": "~3.0.6",
-    "resolve": "~1.1.0"
+    "grunt-known-options": "^1.1.0",
+    "interpret": "^1.1.0",
+    "liftoff": "^2.5.0",
+    "nopt": "^4.0.1",
+    "v8flags": "^3.0.1"
   },
   "devDependencies": {
-    "grunt": "~1.0.1",
-    "grunt-contrib-jshint": "~1.0.0"
+    "grunt": "^1.0.2",
+    "grunt-contrib-jshint": "^1.1.0"
   },
   "files": [
     "bin",