Generate and server Closure sourcemaps.

Change-Id: Ida17718eeffa1f5f1f3c849790d977921707d440

.gitignore

@@ -20,3 +20,4 @@ build/root
 .DS_Store
 tmp
 server/camlistored/newui/all.js
+server/camlistored/newui/all.js.map

Makefile

@@ -36,4 +36,5 @@ $(NEWUIDIR)/all.js: $(NEWUIDIR)/blob_item.js $(NEWUIDIR)/blob_item_container.js
 		--compiler_flags="--jscomp_warning=checkTypes" \
 		--compiler_flags="--debug" \
 		--compiler_flags="--formatting=PRETTY_PRINT" \
+		--compiler_flags="--create_source_map=$(NEWUIDIR)/all.js.map" \
 	> $(NEWUIDIR)/all.js

pkg/server/ui.go

@@ -47,7 +47,7 @@ var _ = log.Printf
 
 var (
 	staticFilePattern  = regexp.MustCompile(`^([a-zA-Z0-9\-\_]+\.(html|js|css|png|jpg|gif))$`)
-	static2FilePattern = regexp.MustCompile(`^new/*(/[a-zA-Z0-9\-\_]+\.(html|js|css|png|jpg|gif))*$`)
+	static2FilePattern = regexp.MustCompile(`^new/*(/[a-zA-Z0-9\-\_]+\.(html|js|css|png|jpg|gif|js\.map))*$`)
 	identOrDotPattern  = regexp.MustCompile(`^[a-zA-Z\_]+(\.[a-zA-Z\_]+)*$`)
 
 	// Download URL suffix:
@@ -445,6 +445,9 @@ func (ui *UIHandler) serveNewUI(rw http.ResponseWriter, req *http.Request) {
 		ui.serveDepsJS(rw, req)
 		return
 	}
+	if file == "/all.js" {
+		rw.Header().Set("X-SourceMap", "all.js.map")
+	}
 	// TODO(mpl): temporary hack to ease the work on the newui with
 	// the closure compiler.
 	if strings.HasSuffix(file, "index.html") && os.Getenv("CAMLI_USE_COMPILED_JS") == "1" {