Store `recordsPath` paths relative to `options.context`

deduplicated modules can be stored in records

fixes #295

lib/NormalModule.js

@@ -213,7 +213,14 @@ NormalModule.prototype.getAllModuleDependencies = function() {
 	return list;
 };
 
-NormalModule.prototype.createTemplate = function(keepModules) {
+NormalModule.prototype.createTemplate = function(keepModules, roots) {
+	roots.sort(function(a, b) {
+		var ia = a.identifier();
+		var ib = b.identifier();
+		if(ia < ib) return -1;
+		if(ib < ia) return 1;
+		return 0;
+	});
 	var template = new NormalModule("", "", "", [], "", null);
 	template._source = this._source;
 	template.built = this.built;
@@ -224,6 +231,13 @@ NormalModule.prototype.createTemplate = function(keepModules) {
 			return m.id;
 		}).join(", ");
 	};
+	template.identifier = function() {
+		var array = roots.map(function(m) {
+			return m.identifier();
+		});
+		array.sort();
+		return array.join("|");
+	};
 	var args = template.arguments = [];
 	function doDeps(deps) {
 		return deps.map(function(dep) {

lib/RecordIdsPlugin.js

@@ -2,9 +2,19 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
+var path = require("path");
+
 function RecordIdsPlugin() {
 }
 module.exports = RecordIdsPlugin;
+
+function makeRelative(compiler, identifier) {
+	var context = compiler.context;
+	return identifier.split("|").map(function(str) {
+		return path.relative(context, str);
+	}).join("|");
+}
+
 RecordIdsPlugin.prototype.apply = function(compiler) {
 	compiler.plugin("compilation", function(compilation) {
 		compilation.plugin("record-modules", function(modules, records) {
@@ -12,7 +22,7 @@ RecordIdsPlugin.prototype.apply = function(compiler) {
 			if(!records.modules) records.modules = {};
 			if(!records.modules.byIdentifier) records.modules.byIdentifier = {};
 			modules.forEach(function(module) {
-				var identifier = module.identifier();
+				var identifier = makeRelative(compiler, module.identifier());
 				records.modules.byIdentifier[identifier] = module.id;
 			});
 		});
@@ -23,7 +33,7 @@ RecordIdsPlugin.prototype.apply = function(compiler) {
 			var usedIds = {0: true};
 			modules.forEach(function(module) {
 				if(module.id !== null) return;
-				var identifier = module.identifier();
+				var identifier = makeRelative(compiler, module.identifier());
 				var id = records.modules.byIdentifier[identifier];
 				if(id === undefined) return;
 				if(usedIds[id]) return;
@@ -42,7 +52,7 @@ RecordIdsPlugin.prototype.apply = function(compiler) {
 				block = block.parent;
 			}
 			if(!block.identifier) return null;
-			ident.unshift(block.identifier());
+			ident.unshift(makeRelative(compiler, block.identifier()));
 			return ident.join(":");
 		}
 		compilation.plugin("record-chunks", function(chunks, records) {
@@ -112,4 +122,4 @@ RecordIdsPlugin.prototype.apply = function(compiler) {
 			}
 		});
 	});
-};
+};

lib/optimize/DedupePlugin.js

@@ -81,7 +81,7 @@ DedupePlugin.prototype.apply = function(compiler) {
 						var commonModules = roots.commonModules;
 						var initialLength = roots.initialCommonModulesLength;
 						if(initialLength !== commonModules.length) {
-							var template = roots[0].createTemplate(commonModules);
+							var template = roots[0].createTemplate(commonModules, roots.slice());
 							roots.template = template;
 							chunk.addModule(template);
 							template.addChunk(chunk);