whoops! wow, wrong message to reply to... please disregard the previous.
Apologies,
~Mark Snyder
----- Original Message ----
From: "haskell-cafe-request@haskell.org"
To: haskell-cafe@haskell.org
Sent: Thursday, September 25, 2008 12:13:22 PM
Subject: Haskell-Cafe Digest, Vol 61, Issue 49
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Today's Topics:
1. RE: Injecting Haskell into C (Simon Peyton-Jones)
2. Re: Haskell board game (Ryan Ingram)
3. Re: Am I doing it right? (Achim Schneider)
4. Re: if - then - else layout (Jules Bean)
5. Re: if - then - else layout (Achim Schneider)
6. Re: Distributing Haskell binaries as OSX App Bundles
(Christian Maeder)
7. Re: if - then - else layout (Achim Schneider)
8. Re: if - then - else layout (Achim Schneider)
9. announcing darcs 2.1.0pre2 (Eric Kow)
10. Re: pure Haskell database (jean-christophe mincke)
11. Re: pure Haskell database (Achim Schneider)
12. Re: pure Haskell database (Marc Weber)
13. Re[2]: [Haskell-cafe] pure Haskell database (Bulat Ziganshin)
14. Re: Google Android (Adam Langley)
15. Re: Google Android (Maarten Hazewinkel)
16. Where is OpenGL loadMatrix ? (minh thu)
17. Re: Where is OpenGL loadMatrix ? ( Krzysztof Skrz?tnicki )
18. Re: Where is OpenGL loadMatrix ? (Achim Schneider)
19. Re: Re: Where is OpenGL loadMatrix ? (minh thu)
20. StateWriter: a monad-writing exercise (Anthony LODI)
21. Re: StateWriter: a monad-writing exercise (Henning Thielemann)
22. Re: Re: Where is OpenGL loadMatrix ? (Bit Connor)
23. Re: Re: Where is OpenGL loadMatrix ? (minh thu)
24. Re: Where is OpenGL loadMatrix ? (Achim Schneider)
25. Re: pure Haskell database (Manlio Perillo)
26. Microsoft's Craig Mundie outlines the future of computing
(Lihn, Steve)
27. GHC 6.10, OS X, Fink and CPPFLAGS (Svein Ove Aas)
28. Re: Climbing up the shootout... (Ketil Malde)
29. Problem with existential quantification (Eric)
----------------------------------------------------------------------
Message: 1
Date: Thu, 25 Sep 2008 08:32:44 +0100
From: Simon Peyton-Jones
Subject: RE: [Haskell-cafe] Injecting Haskell into C
To: Anatoly Yakovenko , "roma@ro-che.info"
Cc: haskell
Message-ID:
<638ABD0A29C8884A91BC5FB5C349B1C32D766E2F96@EA-EXMSG-C334.europe.corp.microsoft.com>
Content-Type: text/plain; charset="us-ascii"
Anatoly
I have not been following the details, but would you consider writing up your example on the GHC user guide Wiki?
http://haskell.org/haskellwiki/GHC/Using_the_FFI
It's a very good way to share your experience with others.
Simon
| -----Original Message-----
| From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-
| bounces@haskell.org] On Behalf Of Anatoly Yakovenko
| Sent: 24 September 2008 22:42
| To: roma@ro-che.info
| Cc: haskell
| Subject: Re: [Haskell-cafe] Injecting Haskell into C
|
| you'll find this example really helpfull
|
|
| ---------- Forwarded message ----------
| From: Claude Heiland-Allen
| Date: 2008/6/5
| Subject: Re: [Haskell-cafe] example of FFI FunPtr
| To: "Galchin, Vasili"
| Cc: haskell
|
|
| Galchin, Vasili wrote:
| >
| > Hello,
| >
| > I want to model a Haskell function that is a callback from C. I have
| > only found one example in the unix package's Semaphore.hsc, which
| apparently
| > is not used. I want to be able to marshall a Haskell function that is a
| > first class citizen residing in a Haskell data type and pass to a C
| function
| > via FFI. Are there examples of this?
|
| Attached is a simple example.
|
| The main thing to note is 'foreign import ccall "wrapper"' which gives
| you a factory for turning Haskell functions into foreign function
| pointers.
|
| More information:
|
| http://www.cse.unsw.edu.au/~chak/haskell/ffi/
|
|
| Claude
| --
| http://claudiusmaximus.goto10.org
|
|
| CallBacker: CallBacker.hs callerback.c callerback.h
| ghc -O2 -Wall -fffi -o CallBacker CallBacker.hs callerback.c
|
| _______________________________________________
| Haskell-Cafe mailing list
| Haskell-Cafe@haskell.org
| http://www.haskell.org/mailman/listinfo/haskell-cafe
------------------------------
Message: 2
Date: Thu, 25 Sep 2008 01:09:02 -0700
From: "Ryan Ingram"
Subject: Re: [Haskell-cafe] Haskell board game
To: "Rafael C. de Almeida"
Cc: haskell-cafe@haskell.org
Message-ID:
<2f9b2d30809250109g3f0a2359s31a003c515549875@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Bertram has put together a peg solitaire game using gtk2hs with Prompt
for control:
http://int-e.home.tlink.de/haskell/solitaire.tar.gz
It's a good read and probably a good starting point for other board games.
-- ryan
On Wed, Sep 24, 2008 at 7:04 PM, Rafael C. de Almeida
wrote:
Hello,
I'm interested in doing a simple board game on haskell. For that I want
to be able to draw stuff like the possible player movements and I want
to be able to display very simple animations. I want to know what
graphical interface library you suggest to me.
I have almost no prior experience with graphical interfaces of any kind,
so I rather start with something easy and straightforward. I have no
need for great performance or anything like that. I'd like if it runs on
windows with much trouble, that is, it'll be easy to package it for
windows without requiring the user to install anything besides my game.
My first thought was to use GTK's gtkTable, but I'm unsure how easy it
is to make it work on windows. Beside that, I'm not sure it would be the
easiest API for me to use.
[]'s
Rafael
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------------------------------
Message: 3
Date: Thu, 25 Sep 2008 10:41:38 +0200
From: Achim Schneider
Subject: [Haskell-cafe] Re: Am I doing it right?
To: haskell-cafe@haskell.org
Message-ID: <20080925104138.02079514@solaris>
Content-Type: text/plain; charset=US-ASCII
Daniel Fischer wrote:
The fast searching function on ByteStrings has already been written
for you :)
That's in ghc 6.8.3, which is not in gentoo but only in the haskell
overlay, which means that all blame goes to the gentoo maintainers for
being utterly out of date.
The KMP import works like a charm.
findSubstring is only defined for strict bytestrings... try
running those benchmarks again, this time on data bigger than your ram.
Not to mention that it's deprecated.
The really interesting topic is hacking Parsec to use KMP search on
"manyTill anyChar (try string match), or rather any recursive try
involving combinators that can calculate the position for the next
candidate match as a side effect.
PS: Thank you for not pointing out that my original code crashes on
B.tail B.empty in some cases, or even just that it can't replace
overlapping matches at all.
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------------------------------
Message: 4
Date: Thu, 25 Sep 2008 09:45:12 +0100
From: Jules Bean
Subject: Re: [Haskell-cafe] if - then - else layout
To: leledumbo
Cc: haskell-cafe@haskell.org
Message-ID: <48DB4F98.9000804@jellybean.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
leledumbo wrote:
consider this partial program:
if n>5 then
putStrLn "big"
else
putStrLn "small"
this works fine in hugs, but in ghc I must change it to:
if n>5
then
putStrLn "big"
else
putStrLn "small"
Actually both of those are valid expressions.
And they both work in hugs and ghc.
The question I imagine you're asking involves layout mode:
do
if n>5 then
putStrLn "big"
else
putStrLn "small"
this is shorthand for
do { if n > 5 then putStrLn "big" ; else putStrLn "small" }
which is a syntax error. A statement in a do block cannot begin with the
keyword "else".
If you indent the else a bit further than it counts and a continuation
of the enclosing expression (beginning with if) so it desugars to
do { if n > 5 then putStrLn "big" else putStrLn "small" }
which is fine.
Haskell' is apparently going to include a hack to permit this case. I
think that's a poor decision, because including a hack to the layout
rule makes it harder to understand and explain the layout rule.
Jules
------------------------------
Message: 5
Date: Thu, 25 Sep 2008 10:48:21 +0200
From: Achim Schneider
Subject: [Haskell-cafe] Re: if - then - else layout
To: haskell-cafe@haskell.org
Message-ID: <20080925104821.09da2a93@solaris>
Content-Type: text/plain; charset=US-ASCII
"Brandon S. Allbery KF8NH" wrote:
I think Hugs is violating the Haskell98 layout rules.
One could argue that GHC should, too.
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------------------------------
Message: 6
Date: Thu, 25 Sep 2008 11:04:00 +0200
From: Christian Maeder
Subject: [Haskell-cafe] Re: Distributing Haskell binaries as OSX App
Bundles
To: Stephen
Cc: Haskell-Cafe@haskell.org
Message-ID: <48DB5400.4060804@dfki.de>
Content-Type: text/plain; charset=ISO-8859-1
Stephen wrote:
I wrote a command-line program recently for a friend in haskell.
However, he's far away and not particularly computer literate. I sent
him the raw binaries, but they came up with errors about not being able
to find libgmp stuff. So then I thought I should probably be able to
I usually link in libgmp.a statically. This happens automatically if
libgmp.a resides in ghc's libdir (just copy it)
Cheers Christian
------------------------------
Message: 7
Date: Thu, 25 Sep 2008 11:12:26 +0200
From: Achim Schneider
Subject: [Haskell-cafe] Re: if - then - else layout
To: haskell-cafe@haskell.org
Message-ID: <20080925111226.67482196@solaris>
Content-Type: text/plain; charset=US-ASCII
Jules Bean wrote:
do
if n>5 then
putStrLn "big"
else
putStrLn "small"
this is shorthand for
do { if n > 5 then putStrLn "big" ; else putStrLn "small" }
which is a syntax error. A statement in a do block cannot begin with
the keyword "else".
Haskell' is apparently going to include a hack to permit this case. I
think that's a poor decision, because including a hack to the layout
rule makes it harder to understand and explain the layout rule.
There's no need to hack the layout rule, you're even giving pointers to
the solution. Something like this:
if p = do
(_, c, a) <- get
put (b, c, a)
mzero
then c = do
(b, _, a) <- get
put (b, c, a)
mzero
else a = do
(b, c, _) <- get
put (b, c, a)
mzero
end = do
(b, c, a) <- get
return if p then a else c
Advantages are obvious: Order doesn't really matter anymore, as in
then "get away"
else "or else"
if i tell you to
end
Furthermore, this scheme supports logical comments, a rare kind of
control structure enabling mindboggingly diverse rapid prototyping
options:
if i knew what i want to do
if i knew how to do it
then i'd have written the next line much earlier
if i wrote this line
then i don't need to remove the other lines
else where in other languages i'd have to do that
end
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------------------------------
Message: 8
Date: Thu, 25 Sep 2008 11:20:58 +0200
From: Achim Schneider
Subject: [Haskell-cafe] Re: if - then - else layout
To: haskell-cafe@haskell.org
Message-ID: <20080925112058.46e0c095@solaris>
Content-Type: text/plain; charset=US-ASCII
Achim Schneider wrote:
if i knew how to do it
Sorry, apparent mistake, besides confusing b (bool) with p (predicate):
if p _ c = do
(_, _, a) <- get
put (p, c, a)
mzero
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------------------------------
Message: 9
Date: Thu, 25 Sep 2008 10:32:27 +0100
From: Eric Kow
Subject: [Haskell-cafe] announcing darcs 2.1.0pre2
To: darcs-users@darcs.net
Cc: haskell-cafe@haskell.org
Message-ID: <20080925093227.GG301@Macintosh.local>
Content-Type: text/plain; charset="utf-8"
Hi everybody,
The second pre-release of darcs 2.1 (formerly known as 2.0.3) is now
available at http://darcs.net/darcs-2.1.0pre2.tar.gz
We have increased the version number since the last pre-release because
we are adopting an important new behaviour:
The darcs initialize command now creates darcs-2 format
repositories by default
This will help new repositories to benefit from the improved handling of
duplicate patches and to avoid the exponential time conflicts problem.
Upcoming release schedule
-------------------------
2008-10-03: darcs 2.1.0pre3
2008-10-10: darcs 2.1.0
Work remaining
--------------
* http://bugs.darcs.net/issue971 (Petr Ročkai)
When using hashed or repositories, allow darcs check to deal with filenames
that differ only in case when run on a case-insensitive filesystem. Petr
has done 90% of the work for this -- he has implemented this for darcs
repair -- so this shall largely be a question of refactoring.
* http://bugs.darcs.net/issue1003
Allow darcs-transfer mode to deal with a specific set of missing files
(namely _darcs/format) so that users can benefit from ssh connection
sharing even if the remote end uses an old-fashioned repository. In
the meantime, a simple workaround is to touch the _darcs/format file in
the remote repoistory
* http://bugs.darcs.net/issue1078
Fix a corner case in paths handling that makes darcs overly
cautious if the repository is a symbolic link
* http://bugs.darcs.net/issue1026
Improve the error messages for 'bug in get_extra' errors, which can
happen if darcs is fooled into thinking that two patches are the same.
Changes since the last pre-release
----------------------------------
* User Experience: Do not allow users to add files to a darcs repository if
their filenames would be considered invalid under Windows. This can be
overridden with the --reserved-ok flag (issue53, Eric Kow)
* Bug Fix: Do not leave behind a half-gotten directory if darcs get fails
(issue1041, Vlad Dogaru, David Roundy)
* User Experience: notice when you are trying to pull from a seemingly
unrelated repository, that is one with a sufficiently different history.
This can be overridden with the --allow-unrelated-repos flag (Dmitry
Kurochkin, David Roundy)
* Bug Fix: Fix hang after a user input error (for example, EOF) (Judah
Jacobson)
* Quality Assurance: Improvements to documentation and online help (Simon
Michael)
--
Eric Kow http://www.nltg.brighton.ac.uk/home/Eric.Kow
PGP Key ID: 08AC04F9
