gulpfile.js

var gulp = require('gulp');
var livereload = require('gulp-livereload')
var sass = require('gulp-sass');
var uglify = require('gulp-uglifyjs');
var autoprefixer = require('gulp-autoprefixer');
var sourcemaps = require('gulp-sourcemaps');
var imagemin = require('gulp-imagemin');
var pngquant = require('imagemin-pngquant');
var wait = require('gulp-wait');




gulp.task('imagemin', function () {
    return gulp.src('./source/images/*')
        .pipe(imagemin({
            progressive: true,
            svgoPlugins: [{removeViewBox: false}],
            use: [pngquant()]
        }))
        .pipe(gulp.dest('./source/images/'));
});


gulp.task('sass', function () {
  gulp.src('./source/stylesheets/**/*.scss')
    .pipe(sourcemaps.init())
        .pipe(sass({outputStyle: 'compressed'}).on('error', sass.logError))
        .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 7', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
    .pipe(sourcemaps.write('./'))
    .pipe(gulp.dest('./source/stylesheets/bundle'));
});

gulp.task('uglify', function () {
  gulp.src('./source/javascripts/*.js')
    .pipe(uglify('all.min.js'))
    .pipe(gulp.dest('./source/javascripts/bundle'));
});


gulp.task('watch', function(){
    livereload.listen();

    gulp.watch('./source/stylesheets/**/*.scss', ['sass']);
    gulp.watch('./source/javascripts/*.js', ['uglify']);
    gulp.watch(['./source/stylesheets/bundle/site.css', './source/javascripts/bundle/all.min.js'], function (files){
        livereload.changed(files)
    });

    gulp.watch(['./source/**/*.erb'], function (e){
        gulp.src(e.path)
        .pipe(wait(1000))
        .pipe(livereload({ reloadPage: "http://192.168.1.22:4567/" }));
    });
});