Fix version and help with no gruntfile

bin/grunt

@@ -10,6 +10,7 @@ var extensions = require('interpret').jsVariants;
 var nopt = require('nopt');
 var gruntOptions = require('grunt-known-options');
 var completion = require('../lib/completion.js');
+var info = require('../lib/info.js');
 var pkg = require('../package.json');
 
 // Parse `gruntOptions` into a form that nopt can handle.
@@ -49,8 +50,19 @@ v8flags(function (err, v8flags) {
   }, function (env) {
     var tasks = options.argv.remain;
     delete options.argv;
-    options.gruntfile = env.configPath;
-    var grunt = require(env.modulePath);
-    grunt.tasks(tasks, options);
+    // No grunt install found!
+    if (!env.modulePath) {
+      if (options.version) {
+        process.exit();
+      }
+      if (options.help) {
+        info.help();
+      }
+      info.fatal('Unable to find local grunt.', 99);
+    } else {
+      options.gruntfile = env.configPath;
+      var grunt = require(env.modulePath);
+      grunt.tasks(tasks, options);
+    }
   });
 });

lib/info.js

@@ -0,0 +1,51 @@
+/*
+ * grunt-cli
+ * http://gruntjs.com/
+ *
+ * Copyright (c) 2016 Tyler Kellen, contributors
+ * Licensed under the MIT license.
+ * https://github.com/gruntjs/grunt-init/blob/master/LICENSE-MIT
+ */
+
+'use strict';
+
+// Project metadata.
+var pkg = require('../package.json');
+
+// Display grunt-cli version.
+exports.version = function() {
+  console.log('grunt-cli v' + pkg.version);
+};
+
+// Show help, then exit with a message and error code.
+exports.fatal = function(msg, code) {
+  exports.helpHeader();
+  console.log('Fatal error: ' + msg);
+  console.log('');
+  exports.helpFooter();
+  process.exit(code);
+};
+
+// Show help and exit.
+exports.help = function() {
+  exports.helpHeader();
+  exports.helpFooter();
+  process.exit();
+};
+
+// Help header.
+exports.helpHeader = function() {
+  console.log('grunt-cli: ' + pkg.description + ' (v' + pkg.version + ')');
+  console.log('');
+};
+
+// Help footer.
+exports.helpFooter = function() {
+  [
+    'If you\'re seeing this message, grunt hasn\'t been installed locally to',
+    'your project. For more information about installing and configuring grunt,',
+    'please see the Getting Started guide:',
+    '',
+    'https://gruntjs.com/getting-started',
+  ].forEach(function(str) { console.log(str); });
+};