gulpfile.js

var gulp = require('gulp');
var args = require('yargs').argv;
var config = require('./gulp.config')().getConfig();
var del = require('del');
var glob = require('glob');
var _ = require('lodash');
var path = require('path');
var $ = require('gulp-load-plugins')({lazy: true});

var colors = $.util.colors;
var env = $.util.env;

/**
 * List the available gulp tasks
 */
gulp.task('help', $.taskListing);
gulp.task('default', ['help']);

/**
 * Lint the code, create coverage report, and a visualizer
 * @return {Stream}
 */
gulp.task('vet', function() {
    log('Analyzing source with JSHint and JSCS');

    return gulp
        .src(config.js)
        .pipe($.if(env.verbose, $.print()))
        .pipe($.jshint.reporter('jshint-stylish'))
        .pipe($.jscs());
});

/**
 * Bump the version
 * --type=pre will bump the prerelease version *.*.*-x
 * --type=patch or no flag will bump the patch version *.*.x
 * --type=minor will bump the minor version *.x.*
 * --type=major will bump the major version x.*.*
 * --version=1.2.3 will bump to a specific version and ignore other flags
 */
gulp.task('bump', function() {
    var msg = 'Bumping versions';
    var type = args.type;
    var version = args.ver;
    var options = {};
    if (version) {
        options.version = version;
        msg += ' to ' + version;
    } else {
        options.type = type;
        msg += ' for a ' + type;
    }
    log(msg);

    return gulp
        .src(config.packages)
        .pipe($.print())
        .pipe($.bump(options))
        .pipe(gulp.dest(config.root));
});

/**
 * Build everything
 */
gulp.task('build', ['clean'], function(done) {
    log('Optimizing the js, css, and html');

    var stream = gulp
        .src(config.js)
        .pipe(getHeader())
        .pipe(gulp.dest(config.build))
        .pipe($.uglify())
        .pipe(getHeader())
        .pipe($.rename('bard.min.js'))
        .pipe(gulp.dest(config.build))
        .on('end', success)
        .on('error', error);

    function error(err) {
        log(err);
        done(err);
    }

    function success() {
        var msg = {
            title: 'gulp build',
            message: 'Deployed to the dist folder'
        };
        log(msg);
        notify(msg);
        done();
    }
});

/**
 * Remove all files from the build, temp, and reports folders
 * @param  {Function} done - callback when complete
 */
gulp.task('clean', function(done) {
    var delconfig = [].concat(config.build, config.report);
    log('Cleaning: ' + $.util.colors.blue(delconfig));
    del(delconfig, done);
});

/**
 * Delete all files in a given path
 * @param  {Array}   path - array of paths to delete
 * @param  {Function} done - callback when complete
 */
function clean(path, done) {
    log('Cleaning: ' + $.util.colors.blue(path));
    del(path, done);
}

/**
 * Formatter for bytediff to display the size changes after processing
 * @param  {Object} data - byte data
 * @return {String}      Difference in bytes, formatted
 */
function bytediffFormatter(data) {
    var difference = (data.savings > 0) ? ' smaller.' : ' larger.';
    return data.fileName + ' went from ' +
        (data.startSize / 1000).toFixed(2) + ' kB to ' +
        (data.endSize / 1000).toFixed(2) + ' kB and is ' +
        formatPercent(1 - data.percent, 2) + '%' + difference;
}

/**
 * Format a number as a percentage
 * @param  {Number} num       Number to format as a percent
 * @param  {Number} precision Precision of the decimal
 * @return {String}           Formatted perentage
 */
function formatPercent(num, precision) {
    return (num * 100).toFixed(precision);
}

/**
 * Format and return the header for files
 * @return {String}           Formatted file header
 */
function getHeader() {
    var pkg = require('./package.json');
    var template = ['/**',
        ' * <%= pkg.name %> - <%= pkg.description %>',
        ' * @authors <%= pkg.authors %>',
        ' * @version v<%= pkg.version %>',
        ' * @link <%= pkg.homepage %>',
        ' * @license <%= pkg.license %>',
        ' */',
        ''
    ].join('\n');
    return $.header(template, {
        pkg: pkg
    });
}

/**
 * Log a message or series of messages using chalk's blue color.
 * Can pass in a string, object or array.
 */
function log(msg) {
    if (typeof(msg) === 'object') {
        for (var item in msg) {
            if (msg.hasOwnProperty(item)) {
                $.util.log($.util.colors.blue(msg[item]));
            }
        }
    } else {
        $.util.log($.util.colors.blue(msg));
    }
}

/**
 * Show OS level notification using node-notifier
 */
function notify(options) {
    var notifier = require('node-notifier');
    var notifyOptions = {
        sound: 'Bottle',
        contentImage: path.join(__dirname, 'gulp.png'),
        icon: path.join(__dirname, 'gulp.png')
    };
    _.assign(notifyOptions, options);
    notifier.notify(notifyOptions);
}