Gulp setup with Swig.

gulpfile.js

'use strict';

var gulp     = require('gulp');
var sass     = require('gulp-sass');
var swig     = require('gulp-swig');
var clean    = require('gulp-clean');
var connect  = require('gulp-connect');
var watch    = require('gulp-watch');
var batch    = require('gulp-batch');
var imagemin = require('gulp-imagemin');
var pngquant = require('imagemin-pngquant');

var config = {
	dev: {
		sass: 'dev/sass/**/*.scss',
    html: './dev/html/**/*.html',
    images: './dev/img/*'
	},
	prod: {
		css: 'prod/css',
    html: './prod/',
    images: './prod/images/'
	},
  clean: {
    html: './prod/partials/'
  }
};

gulp.task('clean', function(){
  gulp.src(config.clean.html, {read: false})
    .pipe(clean());
});

gulp.task('imagemin', function(){
  gulp.src(config.dev.images)
    .pipe(imagemin({
        progressive: true,
        svgoPlugins: [{removeViewBox: false}],
        use: [pngquant()]
    }))
    .pipe(gulp.dest(config.prod.images));
});

gulp.task('connect', function(){
  connect.server({
    root: config.prod.html,
    livereload: true
  });
});

gulp.task('html', function(){
  gulp.src(config.prod.html+'*.html')
    .pipe(connect.reload());
});

gulp.task('swig', function() {
  gulp.src(config.dev.html)
    .pipe(swig({defaults: { cache: false }}))
    .pipe(gulp.dest(config.prod.html));
});

gulp.task('sass', function(){
  gulp.src(config.dev.sass)
    .pipe(sass({
    	includePaths: require('node-bourbon').includePaths
    }).on('error', sass.logError))
    .pipe(gulp.dest(config.prod.css));
});
 
gulp.task('watch', function(){
  watch(config.dev.sass, batch(function (events, done) {
    gulp.start('sass', done);
  }));

  watch(config.dev.html, batch(function (events, done) {
    gulp.start('swig', done);
  }));

  watch(config.dev.images, batch(function (events, done) {
    gulp.start('imagemin', done);
  }));

  watch([config.prod.html+'*.html',config.prod.css+'/main.css',config.prod.images+'.{jpg,png}'], batch(function (events, done) {
    gulp.start('html', done);
  }));  
});

gulp.task('default', ['sass','swig','connect','imagemin','watch']);