[Haskell-cafe] time and TimeLocale compatibility

[Tom Ellis]

Thanks Alberto.

It's disappointing if CPP is the only way to handle this transation. 
However, if this is indeed the case it would be better to do it once and for
all (i.e.  abstract this process into a resuable component) rather than
force every package maintainer to do it on an individual level.  Thus I have
created the following time14-compat package providing Data.Time.Compat that
can be used from both 1.4 and 1.5:

    https://github.com/tomjaguarpaw/haskell-time14-compat

Comments welcome.  I haven't tested it particularly thoroughly, but it is
rather simple.  I'll stick it up on Hackage once enough eyeballs have
sanity-checked it.

Tom


On Sun, Mar 22, 2015 at 10:31:00AM +0100, Alberto Valverde wrote:
> Hi Tom,
> 
> This worked for me:
> https://ghc.haskell.org/trac/ghc/wiki/Migration/7.10#time-1.5.0.1
> 
> Cheers,
> Alberto
> 
> On Sunday, March 22, 2015, Tom Ellis <
> tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk> wrote:
> 
> > Hello all,
> >
> > The `formatTime` function from time-1.4 uses the TimeLocale type from
> > old-locale, whereas time-1.5 provides its own definition of the TimeLocale
> > type.  I want to provide `formatTime` with the argument
> > `defaultTimeLocale`.
> > 1.4 requires the version in old-locale whereas 1.5 requires the version it
> > defines itself.
> >
> > Is it possible to use this function in a way that is compatible with both
> > 1.4 and 1.5?  If time-1.5 had merely reexported the old-locale version, and
> > then (the future) time-1.6 replaced it completely this would have offered a
> > smoother upgrade path, but as far as I can tell nothing like this was done.
> >
> > What are my options?
> >
> > Tom
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