Interleaving per-component hooks with build

Hi, I am looking for a way to do custom preprocessing for each component (of type `UnitId -> IO ()`) but this preprocessing depends on the dependencies of the component being already built. So imagine a Cabal file which defines a library and an exe, with the exe depending on the library. Then, I would need the following sequence of events to happen during `buildHook`: 1. myPreprocessing unitIdOfLibrary 2. standard build of library 3. myPreprocessing unitIdOfExe 4. standard build of exe How can I achieve that without copy-pasting large parts of the internals of `buildHook simpleUserHooks`? Thanks, Gergo