feat(gulp): run gulp tasks

Following the convention cmd:before and cmd:after.

Example: `ionic serve`

Would execute tasks 'serve:before' and 'serve:after' before and after
the command, respectively.

lib/cli.js

@@ -10,12 +10,16 @@ var Cli = module.exports,
     Ionitron = require('./ionic/ionitron'),
     optimist = require('optimist'),
     path = require('path'),
+    fs = require('fs'),
     settings = require('../package.json'),
     Tasks = require('./tasks/cliTasks'),
     Utils = IonicAppLib.utils,
     logging = IonicAppLib.logging,
     Q = require('q'),
-    semver = require('semver');
+    semver = require('semver'),
+    gutil = require('gulp-util'),
+    chalk = require('chalk'),
+    prettyTime = require('pretty-hrtime');
 
 Cli.Tasks = TASKS = Tasks;
 
@@ -130,16 +134,90 @@ Cli.run = function run(processArgv) {
       argv.v2 = true;
     }
 
-    // Only some tasks return promises
-    var promise = Q.fcall(taskInstance.run.bind(taskInstance), Cli, argv);
+    var gulpFound = loadGulp();
+    if (gulpFound) {
+      logging.logger.debug('Gulpfile found');
+      var gulp = require(path.resolve(process.cwd() + '/node_modules/gulp'));
+      logEvents(gulp);
+
+      return Q.nfcall(gulp.start.bind(gulp), argv._[0] + ':before').then(
+        function(){
+          // Only some tasks return promises
+          return Q.fcall(taskInstance.run.bind(taskInstance), Cli, argv);
+        }
+      ).then(function(){
+        return Q.nfcall(gulp.start.bind(gulp), argv._[0] + ':after');
+      });
+    } else {
+      logging.logger.debug('No gulpfile found');
+      return Q.fcall(taskInstance.run.bind(taskInstance), Cli, argv);
+    }
 
-    return promise;
   } catch (ex) {
     logging.logger.debug('Cli.Run - Error', ex);
     return Utils.fail(ex);
   }
 };
 
+function loadGulp(){
+  var names = ['gulpfile.js', 'Gulpfile.js'];
+  var found = false;
+  for (var i = 0, ii = names.length; i < ii; i++) {
+    try {
+      require(path.resolve(process.cwd() + '/' + names[i]));
+      found = true;
+    } catch(e){
+      if (e instanceof SyntaxError) {
+        console.error('\nThere is a syntax error in your gulpfile:');
+        console.error(e.message)
+        process.exit(1);
+      }
+      if (e.code === 'MODULE_NOT_FOUND' && e.message.indexOf(names[i]) === -1) {
+        console.log('\nLooks like you\'re missing a module in your gulpfile:');
+        console.error(e.message);
+        console.log('\nDo you need to `npm install`?\n');
+        process.exit(1);
+      }
+    }
+  }
+  return found;
+}
+
+function logEvents(gulpInst) {
+  gulpInst.on('task_start', function(e) {
+    // TODO: batch these
+    // so when 5 tasks start at once it only logs one time with all 5
+    gutil.log('Starting', '\'' + chalk.cyan(e.task) + '\'...');
+  });
+
+  gulpInst.on('task_stop', function(e) {
+    var time = prettyTime(e.hrDuration);
+    gutil.log(
+      'Finished', '\'' + chalk.cyan(e.task) + '\'',
+      'after', chalk.magenta(time)
+    );
+  });
+
+  gulpInst.on('task_err', function(e) {
+    var msg = formatError(e);
+    var time = prettyTime(e.hrDuration);
+    gutil.log(
+      '\'' + chalk.cyan(e.task) + '\'',
+      chalk.red('errored after'),
+      chalk.magenta(time)
+    );
+    gutil.log(msg);
+  });
+
+  gulpInst.on('task_not_found', function(err) {
+    gutil.log(
+      chalk.red('Task \'' + err.task + '\' is not in your gulpfile')
+    );
+    gutil.log('Please check the documentation for proper gulpfile formatting');
+    process.exit(1);
+  });
+}
+
 Cli.getBooleanOptionsForTask = function getBooleanOptionsForTask(task) {
   var availableTaskOptions = task.options;
   var booleanOptions = [];

package.json

@@ -59,6 +59,7 @@
   "license": "MIT",
   "dependencies": {
     "async": "0.9.2",
+    "chalk": "^1.1.1",
     "cheerio": "0.19.0",
     "cli-table": "0.3.1",
     "colors": "0.6.2",
@@ -71,12 +72,14 @@
     "finalhandler": "0.2.0",
     "form-data": "0.1.4",
     "gulp": "3.8.8",
+    "gulp-util": "^3.0.7",
     "inquirer": "0.11.2",
     "ionic-app-lib": "2.0.0-beta.9",
     "moment": "2.11.1",
     "ncp": "0.4.2",
     "open": "0.0.5",
     "optimist": "0.6.0",
+    "pretty-hrtime": "^1.0.2",
     "progress": "1.1.7",
     "prompt": "0.2.12",
     "proxy-middleware": "0.7.0",