I thought I was going to misrepresent stuff, but may be not to that extent.

If we fork polybori I do not see the point of patching it for sage on top
of the fork. (3) is very much out as far as I am concerned.

François

> On 11/06/2015, at 14:08, R. Andrew Ohana <andrew.oh...@gmail.com> wrote:
> 
> 
> 
> On Wed, Jun 10, 2015 at 6:40 PM, François Bissey 
> <francois.bis...@canterbury.ac.nz> wrote:
> Hi all,
> 
> over at http://trac.sagemath.org/ticket/18437 we have
> some heated debate about what to do about polybori.
> 
> Let me summarize the situation.
> * at this moment polybori is dead upstream
> * polybori is the last package using scons
> * is one of the last packages, if not the last, not
> ready for python 3.x
> * polybori is actually python wrapper over another
> package called CUDD which is included in polybori
> and "scons-ified".
> 
> This is a off, polybori is its own c++ library -- cudd is merely a dependency 
> (and polybori doesn't even use much of it). It is true that polybori ships 
> its own version of cudd (almost certainly because cudd's build system is 
> atrocious).
> 
> 
> There is a strong debate about what to do about
> the situation.
> 
> * fork upstream and keep it as a separate package but
> no one really wants to be the maintainer.
> 
> I think Jeroen and I agree that we need to fork polybori -- the debate is 
> more in the details.
>  
> 
> * autotool CUDD (Andrew Ohanar prodded upstream to
> see if they would be willing to adopt any autotooling
> we provide without answer so far)
> 
> Upstream cudd has gotten back to me now, they are apparently planning a new 
> release sometime this summer which uses autotools for its build system.
>  
> and move the
> python binding in sage itself making its maintenance
> a shared task amongst sage dev. CUDD would become
> a standard package to replace polybori. Note it is
> currently shipped inside polybori so it is not something
> new.
> 
> * Hybrid in between those two.
> 
> More details on the ticket. I would very much would
> go with autotooling CUDD and move the wrapper.
> The fork of polybori would also move to autotool
> as its build system at this stage.
> 
> Because of strong opinions on the ticket and the burden
> of the various options, Jeroen pointed out that we
> should get some kind of consensus here before moving
> forward.
> 
> So we would very much want to hear from other devs
> on what to do with polybori.
> 
> Francois
> 
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> 
> The main debate is around what we should do with the python bindings for 
> polybori. From the ticket:
> 
> """
> As I see it there are three routes we could go with polybori:
>       • We adopt the route that we took with Pynac (as a fork of Ginac). Our 
> fork might in the future become tightly coupled with Sage, but we maintain it 
> as a separate package outside of Sage.
>       • We make a minimal fork, only include the minimal changes necessary to 
> build polybori without scons. If more substantive changes are needed, we 
> include those in the Sage library.
>       • A hybrid approach: maintain a minimal fork, and a maintain a set of 
> patches for more substantive changes.
> """
> I would personally vote for 1 or 2, and very much against 3. Some pros and 
> cons of the various proposals I mentioned:
> Pros of 1:
> 
>       • We already have pursed this model with Pynac.
>       • It allows us to modify the c++ code in polybori if we need to.
> Cons of 1:
>       • Maintenance of Pynac has lapsed as people have gotten busy.
>       • (From Jeroen) It isn't held to the same standard as our normal review 
> process for Sage.
> 
> 
> Pros of 2:
> 
>       • It distributes the burden of maintenance across the whole Sage 
> community (in particular, it is easier for a Sage contributor to work on) 
>       • Polybori's bindings does things a bit differently if it is in a Sage 
> environment (we included polybori before it had python bindings)
> 
> 
> Con of 3:
> 
>       • Maintaining patches is more work than maintaining a forked version of 
> the code (especially when upstream is dead).
> 
> 
> If anybody has any better suggestions or thoughts on the matter, I would be 
> very open to hear them.
> 
> For what its worth, the hard part of making the autotools based build system 
> is done (at least for the components of polybori that Sage uses). At this 
> point it is mainly a matter of how we want to deal with the python bindings, 
> which will need to be updated to work with python 3.
> 
> -- 
> Andrew
> 
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