gulpfile.js

var args = require('yargs').argv;
var config = require('./gulp.config')();
var gulp = require('gulp');
var $ = require('gulp-load-plugins')({lazy: true});

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

/**
 * 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($.bump(options))
        .pipe(gulp.dest(config.root));
});

////////////////

/**
 * 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));
    }
}