metalsmith.js

function build(callback) {
	Metalsmith(__dirname)         // __dirname defined by node.js:
                                // name of current working directory
		.metadata({                 // add any variable you want
																// use them in layout-files
			sitename: "foo",
			siteurl: "https://foo.com/",
			description: "Website!",
			generatorname: "Metalsmith",
			generatorurl: "https://metalsmith.io/"
		})
		.source('ms-posts')       // source directory
		.destination('ms-site')   // destination directory
		.clean(true)                // clean destination before
		.use(collections({          // group all blog posts by internally
			posts: 'ms-posts/*/*.md'  // adding key 'collections':'posts'
		}))                         // use `collections.posts` in layouts
		.use(markdown())            // transpile all md into html
		.use(drafts()) 							// Use the drafts plugin
		.use(permalinks({           // change URLs to permalink URLs
			pattern: ':date/:title',  // generate URLs to YYYY/MM/DD/TITLE
			relative: false           // put css only in /css
		}))
		.use(feed({									// configure feeds
			"site_url": "https://foo.com",
			"metadata": {
				"site": {
					"title": "me",
					"url": "https://foo.com",
					"author": "me"
				}
			},
			"collection": "posts"
		})) 
		//.use(layouts())           	  // wrap layouts around html
		//.use(templates('handlebars')) // use handlebars templates
		.build(function (err) {
			var message = err ? err : 'Build complete';
			console.log(message);
			callback();
		});
}