gulpfile.js

var gulp       = require('gulp'),
	sass       = require('gulp-sass'),
	prefix     = require('gulp-autoprefixer'),
	sourcemaps = require('gulp-sourcemaps'),
	livereload = require('gulp-livereload'),

	input = {
		'sass': [
			'sass/**/*.scss'
			]
	},

	output = {
		'stylesheets': '.'
	},

	sassOpts = {
		errLogToConsole: true,
		outputStyle: 'compressed'
	};

/* run the watch task when gulp is called without arguments */
gulp.task('default', ['build-css','watch']);

/* compile scss files */
gulp.task('build-css', function() {
	gulp
		.src(input.sass)
		.pipe(sourcemaps.init())
		.pipe(sass(sassOpts).on('error',sass.logError))
		.pipe(prefix("last 2 versions"))
		.pipe(sourcemaps.write('.'))
		.pipe(gulp.dest(output.stylesheets))
		.pipe(livereload());
	});

/* Watch these files for changes and run the task on update */
gulp.task('watch', function() {
	livereload.listen();
	gulp.watch(input.sass, ['build-css']);
	});