feat: add option to change the filename (#51)

README.md

@@ -38,6 +38,7 @@ module.exports = {
 Arguments:
 
 * `asset`: The target asset name. `[file]` is replaced with the original asset. `[path]` is replaced with the path of the original asset and `[query]` with the query. Defaults to `"[path].gz[query]"`.
+* `filename`: A `function(asset)` which receives the asset name (after processing `asset` option) and returns the new asset name. Defaults to `false`.
 * `algorithm`: Can be a `function(buf, callback)` or a string. For a string the algorithm is taken from `zlib` (or zopfli for `zopfli`). Defaults to `"gzip"`.
 * `test`: All assets matching this RegExp are processed. Defaults to every asset.
 * `threshold`: Only assets bigger than this size are processed. In bytes. Defaults to `0`.

index.js

@@ -11,6 +11,7 @@ function CompressionPlugin(options) {
 	options = options || {};
 	this.asset = options.asset || "[path].gz[query]";
 	this.algorithm = options.algorithm || "gzip";
+	this.filename = options.filename || false;
 	this.compressionOptions = {};
 	if(typeof this.algorithm === "string") {
 		if (this.algorithm === "zopfli") {
@@ -80,6 +81,9 @@ CompressionPlugin.prototype.apply = function(compiler) {
 					var newFile = this.asset.replace(/\[(file|path|query)\]/g, function(p0,p1) {
 						return sub[p1];
 					});
+					if (typeof this.filename === 'function') {
+						newFile = this.filename(newFile);
+					}					
 					assets[newFile] = new RawSource(result);
 					if (this.deleteOriginalAssets) {
 						delete assets[file];