Request: add support for grovel-locally

[Sod-Almighty]

Every time I run my project,¹ it takes a few minutes for this library to grovel the same .c and .h files.

Given that these files are unlikely to change between executions, strikes me that we could just cache the grovel results, saving considerable time during development.

To this end, I modified my local copy of libusb-ffi.asd as follows:

  :depends-on (#:cffi #:grovel-locally #:static-vectors)
  :components ((:file "package")
         (:caching-grovel-file "libusb-grovel" :cache-dir "cache")
         (:file "libusb-ffi")))

It would be helpful if you could modify your library to support this. The problem, of course, would be to implement some mechanism for selectively choosing (when loading via quicklisp) between "normal" grovelling and cached grovelling.

Some ideas that might work:

• Have the .asd file query the contents of the *features* special variable² (which the programmer presumably alters beforehand).
• Somehow (defconstant ...) something before (ql:quickload)ing the library.
• Have two different .asd files.

Alternatively, if I download this repo and place it in its own directory in my project, can I ignore the .asd file and (load) it myself in some way, but using caching-grovel instead of grovel?

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¹ Specifically pkcmd-lx. I'm the dev ;)

² e.g. using the sharp-plus notation: #+cached-grovelling

[Sod-Almighty]

Bump