gulpfile.js

var gulp = require('gulp'),
    less = require('gulp-less'),
    path = require('path'),
    concat = require('gulp-concat'),
    replace = require('gulp-replace'),
    nodemon = require('gulp-nodemon'),
    clean = require('rimraf'),
    livereload = require('gulp-livereload'),
    express = require('express'),
    bodyParser = require('body-parser'),
    crypto = require('crypto'),
    async = require('async'),
    exec = require('child_process').exec,
    git = require('gulp-git'),
    http = require('http'),
    uglify = require('gulp-uglify'),
    minifyCSS = require('gulp-minify-css'),
    htmlmin = require('gulp-htmlmin');

var delay = function(fn, time) {
    return function() {
        setTimeout(fn, time);
    };
};

gulp.task('less-dev', function() {
    // Builds the CSS
    gulp.src(['public/less/main.less'])
        .pipe(less())
        .pipe(gulp.dest('dist'));
});

gulp.task('less-prod', function() {
    // Builds the CSS
    gulp.src(['public/less/main.less'])
        .pipe(less())
        .pipe(minifyCSS({
            advanced: true
        }))
        .pipe(gulp.dest('dist'));
});

gulp.task('js-dev', function() {
    // Builds the JS
    gulp.src(['public/js/main.js'])
        .pipe(gulp.dest('dist'));
    gulp.src(['public/js/conduct.js'])
        .pipe(gulp.dest('dist'));
});

gulp.task('js-prod', function() {
    // Builds the JS
    gulp.src(['public/js/main.js'])
        .pipe(uglify())
        .pipe(gulp.dest('dist'));
    gulp.src(['public/js/conduct.js'])
        .pipe(uglify())
        .pipe(gulp.dest('dist'));
});

gulp.task('html-dev', function() {
    // Moves and Compresses HTML
    gulp.src(['public/pages/*.html'])
        .pipe(replace('</body>', '<script src="http://localhost:35729/livereload.js"></script></body>'))
        .pipe(gulp.dest('dist/pages'));
});

gulp.task('html-prod', function() {
    // Moves and Compresses HTML
    gulp.src(['public/pages/*.html'])
        .pipe(htmlmin({
            removeComments: true,
            collapseWhitespace: true,
            conservativeCollapse: true,
            caseSensitive: true,
            minifyJS: true,
            keepClosingSlash: true
        }))
        .pipe(gulp.dest('dist/pages'));
});

gulp.task('assets', function() {
    gulp.src(['public/img/**/*'])
        .pipe(gulp.dest('dist/img'));
    gulp.src(['public/vendor/**/*'])
        .pipe(gulp.dest('dist/vendor'));
    gulp.src(['public/files/**/*'])
        .pipe(gulp.dest('dist/files'));
});

gulp.task('server-dev', function() {
    // Runs the server forever
    nodemon({
        script: 'index.js',
        ext: 'js',
        ignore: [
            'public/*',
            'dist'
        ],
        env: {
            PORT: '3000'
        }
    });
});

gulp.task('githook', function() {
    var app = express();

    app.use(bodyParser.text({
        'type': 'application/json'
    }));

    app.post('/githook', function(req, res) {
        var xHubSig = req.headers['x-hub-signature'].substring(5);
        var hmac = crypto.createHmac('sha1', process.env.GITHUB_SECRET || 'thisissosecret');
        hmac.write(req.body);
        var computedHubSig = hmac.digest('hex');
        if (computedHubSig === xHubSig) {
            console.log('\n\nNew changes available:\n');
            async.series([

                function(cb) {
                    console.log('Pulling down changes from github...');
                    git.pull('origin', 'master', {}, cb);
                },
                function(cb) {
                    console.log('Installing new node dependencies...');
                    exec('npm install', cb);
                },
                function(cb) {
                    console.log('Installing new bower dependencies...');
                    exec('bower install', cb);
                },
                function(cb) {
                    console.log('Deploying revised assets...');
                    gulp.start('prod');
                    cb();
                },
                function(cb) {
                    console.log('Moving third-party back into their places');
                    exec('cp ~/mentor.html ~/site/dist/pages/', cb);
                },
                function(cb) {
                    exec('cp ~/register.html ~/site/dist/pages/', cb);
                }
            ], function(err) {
                if (err) {
                    res.status(500).send();
                    console.error(err);
                } else {
                    res.status(200).send();
                    console.log('\nNew changes integrated successfully.');
                }
            });
        } else {
            res.status(500).send();
            console.log('Digests don\'t match');
        }
    });

    http.createServer(app).listen(4000, '0.0.0.0');
});

gulp.task('watch', ['server-dev'], function() {
    livereload.listen();
    gulp.watch('public/js/*.js', ['js-dev']).on('change', livereload.changed);
    gulp.watch('public/less/*.less', ['less-dev']).on('change', delay(livereload.changed, 500));
    gulp.watch('public/pages/*.html', ['html-dev']).on('change', livereload.changed);
});

// Clears all compiled client code
gulp.task('clean', function() {
    clean.sync(path.join(__dirname, 'dist'));
});

gulp.task('build', ['html-dev', 'js-dev', 'less-dev', 'assets']);
gulp.task('deploy', ['html-prod', 'js-prod', 'less-prod', 'assets']);
gulp.task('dev', ['clean', 'build', 'watch']);
gulp.task('prod', ['clean', 'deploy', 'githook']);
gulp.task('default', ['dev']);