Hi Vincent,

On 2016-08-17, Vincent Delecroix <20100.delecr...@gmail.com> wrote:
> Why are you keeping sources in the Sage tree instead of moving 
> everything to your module? (see also my previous post).

It's the other way around. Previously, in my old-style spkg, everything
(code in C, gap, singular, cython and python) was in the spkg, and could
after installation be found in a module pGroupCohomology. Now, my plan
is (or maybe has been...) to move the cython and python code into the
Sage tree.

Why?

When I created the optional (new-style) meataxe spkg, the aim was to
improve matrix arithmetic for finite non-prime fields of odd
characteristic (for these fields, meataxe provides a huge improvement
over what's in Sage by default). Since it affects Sage's matrices,
I was advised to implement it as an OptionalExtension in src/sage/matrix/,
and so I did.

Maybe I am over-generalising that advice, but I got the impression:
If you have a module that makes heavy use of SageMath's infra structure
and relies on an optional C library, then the C library should be put
into a new-style spkg and the rest should be put as an OptionalExtension
into the Sage tree.

In addition, I made the repeated frustrating experience that my old-style
spkg was broken by changes in SageMath. I hope that my spkg would be
easier to maintain when being more closely tied to the Sage tree.

Best regards,
Simon


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