Refactored.

lib/inline-css-url.js

@@ -0,0 +1,21 @@
+var datauri = require('datauri');
+var isLocalPath = require('is-local-path');
+var path = require('path');
+var rework = require('rework');
+var url = require('rework-plugin-url');
+
+var inline = function (css, filePath) {
+	var basePath = path.dirname(filePath);
+	css = rework(css)
+		.use(url(function (url) {
+			if (isLocalPath(url)) {
+				url = path.resolve(basePath, url);
+				url = datauri(url);
+			}
+			return url;
+		}))
+		.toString();
+	return css;
+};
+
+module.exports = inline;