gulpfile.js

var gulp        = require('gulp');
var browserSync = require('browser-sync');
var sass        = require('gulp-sass');
var prefix      = require('gulp-autoprefixer');
var cp          = require('child_process');
var jade        = require('gulp-jade');

var jekyll   = process.platform === 'win32' ? 'jekyll.bat' : 'jekyll';
var messages = {
    jekyllBuild: '<span style="color: grey">Running:</span> $ jekyll build'
};

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

gulp.task('jekyll-rebuild', ['jekyll-build'], function () {
    browserSync.reload();
});

gulp.task('browser-sync', ['sass', 'jekyll-build'], function() {
    browserSync({
        server: {
            baseDir: '_site'
        },
        notify: false
    });
});

gulp.task('sass', function () {
    return gulp.src('assets/css/main.scss')
        .pipe(sass({
            includePaths: ['css'],
            onError: browserSync.notify
        }))
        .pipe(prefix(['last 15 versions', '> 1%', 'ie 8', 'ie 7'], { cascade: true }))
        .pipe(gulp.dest('_site/assets/css'))
        .pipe(browserSync.reload({stream:true}))
        .pipe(gulp.dest('assets/css'));
});

gulp.task('jade',function(){
    return gulp.src('_jade/*.jade')
        .pipe(jade())
        .pipe(gulp.dest('_includes'));
});

gulp.task('watch', function () {
    gulp.watch('assets/css/**', ['sass']);
    gulp.watch(['*.html', '_layouts/*.html', '_posts/*', '_includes/*', '_carousel/*'], ['jekyll-rebuild']);
    gulp.watch('_jade/*.jade', ['jade']);
    gulp.watch('assets/js/**', ['jekyll-rebuild']);
});

gulp.task('default', ['browser-sync', 'watch']);