keep chunk ids

sokra · sokra · commit c5b52b547c8c · 2013-05-08T23:01:25.000+02:00
diff --git a/lib/Compilation.js b/lib/Compilation.js
@@ -383,13 +383,44 @@ Compilation.prototype.applyModuleIds = function applyModuleIds() {
 };
 
 Compilation.prototype.applyChunkIds = function applyChunkIds() {
-	var i = 0;
+	var i = this.cache && this.cache["nextChunkId"] || 1;
+	var usedIds = {0:true};
+	if(this.cache) {
+		if(!this.cache.chunks)
+			this.cache.chunks = {};
+		var keys = Object.keys(this.cache.chunks).slice();
+		var cacheChunks = this.cache.chunks;
+		this.cache.chunks = {};
+	}
 	this.chunks.forEach(function(chunk) {
-		if(chunk.id === null)
-			chunk.id = ++i;
+		if(chunk.id === null) {
+			if(this.cache) {
+				for(var j = 0; j < keys.length; j++) {
+					var chunkId = keys[j];
+					var cacheChunk = cacheChunks[chunkId];
+					if(usedIds[cacheChunk.id]) continue;
+					if(chunk.blocks.some(function(block) {
+						return cacheChunk.blocks.indexOf(block) >= 0;
+					})) {
+						usedIds[cacheChunk.id] = true;
+						chunk.id = cacheChunk.id;
+						break;
+					}
+				}
+			}
+			if(chunk.id === null)
+				chunk.id = i++;
+			if(this.cache) {
+				this.cache.chunks["c"+chunk.id] = {
+					id: chunk.id,
+					blocks: chunk.blocks
+				};
+			}
+		}
 		if(!chunk.ids)
 			chunk.ids = [chunk.id];
-	});
+	}, this);
+	if(this.cache) this.cache["nextChunkId"] = i;
 };
 
 Compilation.prototype.sortItems = function sortItems() {
