Dear GHC devs
See below (in red). I do not know the details of this, but it sounds like a pretty serious problem, and it used to work. Is whatever-it-is confirmed fixed in 7.8? Do we have a test that’ll trip if it breaks again? (I’m guessing that the latter might be hard.)
Thanks
Simon
-----Original Message-----
From: Haskell-Cafe [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Paul Liu
Sent: 30 September 2013 07:18
To: Conal Elliott
Cc: Haskell Cafe
Subject: Re: [Haskell-cafe] Poll & plea: State of GUI & graphics libraries in Haskell
Hi Conal,
I wasn't able to make it to last Saturday's FARM track, but I think
there was a good chance that Paul would have demonstrated his Euterpea
music library, which includes a GUI interface (called MUI) written on
top of GLFW. I wrote its initial implementation (around 2009?) with a
monadic interface that let you wire together UI components with
signals (I believe Dan later wrote an arrow interface, but I could be
wrong). It was actually inspired by the ideas behind your Phooey UI
library. It should be very easy to extract this part out as a
standalone package if there is enough interest.
The only issue with it (and all other UI libraries) is that it doesn't
play nicely in GHCi. It used to work pretty well with GHC 7.2 and 7.4
on almost all platforms (Mac needs an extra hack), but GHC 7.6 broke
Mac (and perhaps Windows too). GHC 7.8 supposedly should fix this
problem.
BTW, as also the author of the GLFW library on HackageDB, I've done
barely minimal to keep this Haskell binding afloat. I'm actually
leaning towards GLFW-b library, which is better maintained, and
provides similar binding for GLFW C library but with a saner interface
(no dependency on the OpenGL library, for example). If you don't need
the two extra things that GLFW does (choice of either dynamic or
static linking to GLFW C, and an embedded bitmap font), I suggest you
try out GLFW-b if you are only looking for a think graphics layer with
input+window+OpenGL.
The only thing keeping GLFW-b from becoming a good foundation for a
pure Haskell UI lib is IMHO the lack of a light-weight,
cross-platform, and full-featured font rendering solution. I believe
many other libraries (including Diagram) are having the same problem.
On Thu, Sep 26, 2013 at 8:32 PM, Conal Elliott <conal@conal.net> wrote:
> I'm polling to see whether there are will and expertise to reboot graphics
> and GUIs work in Haskell. I miss working on functional graphics and GUIs in
> Haskell, as I've been blocked for several years (eight?) due to the absence
> of low-level foundation libraries having the following properties:
>
> * cross-platform,
> * easily buildable,
> * GHCi-friendly, and
> * OpenGL-compatible.
>
> The last several times I tried Gtk2hs, I was unable to compile it on my Mac.
> Years ago when I was able to compile, the GUIs looked and interacted like a
> Linux app, which made them awkward and upleasant to use. wxHaskell (whose
> API and visual appearance I prefered) has for years been incompatible with
> GHCi, in that the second time I open a top-level window, the host process
> (GHCi) dies abruptly. Since my GUI & graphics programs are often one-liners,
> and I tend to experiment a lot, using a full compilation greatly thwarts my
> flow. For many years, I've thought that the situation would eventually
> improve, since I'm far from the only person who wants GUIs or graphics from
> Haskell.
>
> About three years ago, I built a modern replacement of my old Pan and
> V