gulpfile.js

var gulp = require('gulp');
var watch = require('gulp-watch');
var shell = require('gulp-shell');
var sass = require('gulp-sass');

var paths = {
	'src': [
		'./models/**/*.js',
		'./routes/**/*.js',
		'keystone.js',
		'package.json'
	],
	'style': {
		all: './public/styles/**/*.scss',
		output: './public/styles/'
	},
	'templates': {
		all: './templates/**/*.html',
	},
	'routes': {
		all: './routes/**/*.js',
	}
};

gulp.task('watch:sass', function () {
	gulp.watch(paths.style.all, ['sass']);
});
gulp.task('watch:templates', function () {
	gulp.watch(paths.templates.all, ['runKeystone']);
});
gulp.task('watch:routes', function () {
	gulp.watch(paths.routes.all, ['runKeystone']);
});

gulp.task('sass', function(){
	gulp.src(paths.style.all)
		.pipe(sass().on('error', sass.logError))
		.pipe(gulp.dest(paths.style.output));
});

gulp.task('runKeystone', shell.task('node keystone.js'));

gulp.task('watch', [
  'watch:sass',
  'watch:templates',
  'watch:routes'
]);

gulp.task('default', ['watch', 'runKeystone']);