allow to pass options and overwride publicPath

fixes #27

Author: sokra

example/webpack.config.js

@@ -15,13 +15,16 @@ module.exports = {
 		loaders: [
 			{ test: /\.css$/, loader: ExtractTextPlugin.extract(
 				"style-loader",
-				"css-loader?sourceMap"
+				"css-loader?sourceMap",
+				{
+					publicPath: "../"
+				}
 			)},
 			{ test: /\.png$/, loader: "file-loader" }
 		]
 	},
 	plugins: [
-		new ExtractTextPlugin("[name].css?[hash]-[chunkhash]-[name]", {
+		new ExtractTextPlugin("css/[name].css?[hash]-[chunkhash]-[name]", {
 			disable: false,
 			allChunks: true
 		}),

index.js

@@ -27,21 +27,29 @@ function ExtractTextPlugin(id, filename, options) {
 }
 module.exports = ExtractTextPlugin;
 
+function mergeOptions(a, b) {
+	if(!b) return a;
+	Object.keys(b).forEach(function(key) {
+		a[key] = b[key];
+	});
+	return a;
+};
+
 ExtractTextPlugin.loader = function(options) {
 	return require.resolve("./loader") + (options ? "?" + JSON.stringify(options) : "");
 };
 
-ExtractTextPlugin.extract = function(before, loader) {
-	if(loader) {
+ExtractTextPlugin.extract = function(before, loader, options) {
+	if(typeof loader === "string") {
 		return [
-			ExtractTextPlugin.loader({omit: before.split("!").length, extract: true, remove: true}),
+			ExtractTextPlugin.loader(mergeOptions({omit: before.split("!").length, extract: true, remove: true}, options)),
 			before,
 			loader
 		].join("!");
 	} else {
 		loader = before;
 		return [
-			ExtractTextPlugin.loader({remove: true}),
+			ExtractTextPlugin.loader(mergeOptions({remove: true}, options)),
 			loader
 		].join("!");
 	}
@@ -64,17 +72,17 @@ ExtractTextPlugin.prototype.loader = function(options) {
 	return ExtractTextPlugin.loader(options);
 };
 
-ExtractTextPlugin.prototype.extract = function(before, loader) {
-	if(loader) {
+ExtractTextPlugin.prototype.extract = function(before, loader, options) {
+	if(typeof loader === "string") {
 		return [
-			this.loader({omit: before.split("!").length, extract: true, remove: true}),
+			this.loader(mergeOptions({omit: before.split("!").length, extract: true, remove: true}, options)),
 			before,
 			loader
 		].join("!");
 	} else {
 		loader = before;
 		return [
-			this.loader({remove: true}),
+			this.loader(mergeOptions({remove: true}, options)),
 			loader
 		].join("!");
 	}

loader.js

@@ -37,9 +37,10 @@ module.exports.pitch = function(request, preReq, data) {
 
 		if(query.extract !== false) {
 			var childFilename = __dirname + " " + request;
+			var publicPath = typeof query.publicPath === "string" ? query.publicPath : this._compilation.outputOptions.publicPath
 			var outputOptions = {
 				filename: childFilename,
-				publicPath: this._compilation.outputOptions.publicPath
+				publicPath: publicPath
 			};
 			var childCompiler = this._compilation.createChildCompiler("extract-text-webpack-plugin", outputOptions);
 			childCompiler.apply(new NodeTemplatePlugin(outputOptions));