gulpfile.js

/**
 *  Require ALL the things...we need to build our site.
 */

require('es6-promise').polyfill();
var gulp = require('gulp'),
  browserSync = require('browser-sync'),
  sass = require('gulp-sass'),
  compass = require('gulp-compass'),
  cleanCSS = require('gulp-clean-css'),
  prefix = require('gulp-autoprefixer'),
  cp = require('child_process'),
  uglify = require('gulp-uglify'),
  plumber = require('gulp-plumber'),
  gzip = require('gulp-gzip');

var messages = {
  jekyllBuild: '<span style="color: grey">Running:</span> $ jekyll build'
};

/**
 * Build the Jekyll Site
 */
gulp.task('jekyll-build', function(done) {
  browserSync.notify(messages.jekyllBuild);
  return cp.spawn('jekyll', ['build'], {
      stdio: 'inherit'
    }).on('close', done);
});

/**
 * Rebuild Jekyll & do page reload
 */
gulp.task('jekyll-rebuild', ['jekyll-build'], function() {
  browserSync.reload();
});

/**
 * Wait for jekyll-build, then launch the Server
 */
gulp.task('browser-sync', ['compass', 'jekyll-build'], function() {
  browserSync({
    server: {
      baseDir: '_site'
    }
  });
});

/**
 * Compile files from assets/css into both _site/assets/css (for live injecting) and site (for future jekyll builds)
 */


gulp.task('sass-deploy', function() {
  gulp.src('assets/css/**/*.scss')
    .pipe(sass({
      includePaths: ['assets/css'],
    }))
    .pipe(prefix(['last 15 versions', '> 1%', 'ie 8', 'ie 7'], {
      cascade: true
    }))
    .pipe(sass({
      outputStyle: 'compressed'
    }))
    .pipe(gulp.dest('assets/css'))
    .pipe(gulp.dest('_site/assets/css'));
});

/**
 * Watch scss files for changes & recompile
 * Watch html/md files, run jekyll & reload BrowserSync
 */
gulp.task('watch', function() {
  gulp.watch('assets/sass/**', ['compass']);
  gulp.watch('assets/js/dev/**', ['scripts']);
  gulp.watch(['**.md', '**.html', '_layouts/**.html', '_includes/**.html', '_data/**', 'pages/**', 'assets/**.csv', 'assets/images/**', 'projects/**'], ['jekyll-rebuild']);
});

// Compile Compass/sass

gulp.task('compass', function() {
  gulp.src('assets/sass/**.scss')
    .pipe(plumber())
    .pipe(compass({
      css: 'assets/css',
      sass: 'assets/sass',
      image: 'assets/images',
      require: ['breakpoint', 'singularitygs', 'toolkit', 'breakpoint']
    }))
    //.pipe(prefix(['last 15 versions', '> 1%', 'ie 8', 'ie 7'], { cascade: true }))
    .pipe(prefix({
      browsers: ['last 2 version', 'safari 5', 'ie 7', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4']
    }))
    .pipe(gulp.dest('assets/css'))
    .pipe(browserSync.reload({
      stream: true
    }))
    .pipe(gulp.dest('_site/assets/css'));
});

 
gulp.task('minify-css', function() {
  return gulp.src('/assets/css/*.css')
    .pipe(cleanCSS({compatibility: 'ie8'}))
    .pipe(gulp.dest('dist'));
});


// JS Script Tasks

gulp.task('scripts', function() {
  gulp.src('assets/js/dev/**.js')
    .pipe(plumber())
    .pipe(uglify())
    //.pipe(gzip())
    .pipe(gulp.dest('assets/js/prod/'))
    .pipe(browserSync.reload({
      stream: true
    }))
    .pipe(gulp.dest('_site/assets/js/prod/'));
});


/**
 * Default task, running just `gulp` will compile the sass,
 * compile the jekyll site, launch BrowserSync & watch files.
 */
gulp.task('default', ['browser-sync', 'watch']);

gulp.task('deploy', ['jekyll-build', 'sass-deploy']);