put is upsert for files

spike/review/reinvent/ezmded/server/server.go

@@ -268,11 +268,7 @@ func (server *Server) apiV0FilesIDPutHandler(w http.ResponseWriter, r *http.Requ
 	if err != nil {
 		return err
 	}
-	branch, ok := branches[id]
-	if !ok {
-		http.NotFound(w, r)
-		return nil
-	}
+	branch, _ := branches[id]
 	branch.Updated = time.Now().UTC()
 	if title := r.Header.Get("Title"); title != "" {
 		branch.Title = title
@@ -284,7 +280,14 @@ func (server *Server) apiV0FilesIDPutHandler(w http.ResponseWriter, r *http.Requ
 	if err := server.putContentHandler(server.diskFilePath(id), w, r); err != nil {
 		return err
 	}
-	return tree.Put(id, branch)
+	if err := tree.Put(id, branch); err != nil {
+		return err
+	}
+	return json.NewEncoder(w).Encode(map[string]map[string]string{
+		"data": map[string]string{
+			"filePath": path.Join("/api/v0/files", id),
+		},
+	})
 }
 
 func (server *Server) apiV0FilesIDGetHandler(w http.ResponseWriter, r *http.Request) error {