gulpfile.js

// Register build and test automation tasks
'use strict';

// Include gulp
var gulp = require('gulp');

// Include plugins
var jshint = require('gulp-jshint');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var istanbul = require('gulp-istanbul');
var mocha = require('gulp-mocha');
var bump = require('gulp-bump');
var karma = require('gulp-karma');

// Lint Task
gulp.task('lint', function() {
	return gulp.src(['public/app/**/*.js', '!public/app/vendor/**/*.js',
                  'server/**/*.js'])
		.pipe(jshint())
		.pipe(jshint.reporter('jshint-stylish'));
});

// Concatenate & Minify JS
gulp.task('scripts', function() {
	return gulp.src('public/app/**/*.js')
		.pipe(concat('all.js'))
		.pipe(gulp.dest('build'))
		.pipe(rename('all.min.js'))
		.pipe(uglify())
		.pipe(gulp.dest('build'));
});

// Watch Files For Changes
gulp.task('watch', function() {
	gulp.watch(['**/*.js', '!node_modules/**/*.js', '!public/app/vendor/**/*.js'],
             ['lint', 'scripts']);
});

// Testing

function handleError(err) {
	console.log(err.toString());
  this.emit('end');
}

function karmaTest(action) {
	return gulp.src('./foobar')
		.pipe(karma({
			configFile: 'karma.conf.js',
			action: action
		}))
		.on('error', handleError)
    .once('end', function() {
      if (action === 'run') {
        process.exit();
      }
    });
}

function serverTest(exitOnEnd) {
  gulp.src(['./server/**/*.js', '!./server/test/**/*.js'])
    .pipe(istanbul())
    .on('end', function() {
      gulp.src(['./server/test/**/*.spec.js'])
      .pipe(mocha({ reporter: 'list' }))
      .pipe(istanbul.writeReports())
      .on('error', handleError)
      .once('end', function () {
        if (exitOnEnd) {
          process.exit();
        }
      });
    });
}

gulp.task('test', function() {
  serverTest(false);
  return karmaTest('run');
});

// Run server tests and output reports
gulp.task('test:server', function () {
  serverTest(true);
});

// Run client tests and output reports
gulp.task('test:client', function () {
  return karmaTest('run');
});

gulp.task('test:client_watch', function () {
  return karmaTest('watch');
});

gulp.task('bump', function () {
	gulp.src(['./package.json', './bower.json'])
		.pipe(bump())
		.pipe(gulp.dest('./'));
});

// Default Task
gulp.task('default', ['lint', 'scripts', 'watch', 'test:client_watch']);