replace undo semantics, use '.' to repeat undo/redo op
treeea3745a37138622d8cb100b2befd412f9d12be1f
-rw-r--r-- 5762 README
drwxr-xr-x - common
drwxr-xr-x - docs
drwxr-xr-x - ex
drwxr-xr-x - vi