Welcome to issue 180 of the HWN, a newsletter covering developments in
the Haskell community. This release covers the week of May 15 to 21,
2011.
Announcements
Janis Veigtlander announced that the 20th edition of the Haskell
Communities and Activities reports is hot off the press!
Just released HSnippets, Emacs YASnippet snippets for Haskell
https://github.com/polypus74/HSnippets
cheers,
_c
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2011/5/25 Jonas Almström Duregård
> Hi Alexander,
>
>
> > This is "exactly" the applicative style, where idiom brackets come from.
>
> I disagree. Layout has at least two advantages over applicative here:
>
> 1) Applicative costs (at least) three additional characters per function
> parameter.
>
Hi Alexander,
> This is "exactly" the applicative style, where idiom brackets come from.
I disagree. Layout has at least two advantages over applicative here:
1) Applicative costs (at least) three additional characters per function
parameter.
2) You can not have arbitrary infix operators in the
On 5/25/11 5:20 PM, Brandon Moore wrote:
From: Jacek Generowicz Sent: May 25, 2011 2:45 PM
On 2011 May 25, at 17:42, Gwern Branwen wrote:
I feel a bit guilty about spamming the list with all my stupid problems: I would
prefer to find my own way around, but if I had to dive in and rummage around t
On 26 May 2011 08:49, wren ng thornton wrote:
> On 5/25/11 1:03 PM, Bryan O'Sullivan wrote:
>>
>> On Wed, May 25, 2011 at 5:59 AM, Ivan Lazar Miljenovic<
>> ivan.miljeno...@gmail.com> wrote:
>>
>>> Well, using the Char8 version.
>>
>> Just because you *could* do that, it doesn't mean that you *sh
On 5/25/11 1:03 PM, Bryan O'Sullivan wrote:
On Wed, May 25, 2011 at 5:59 AM, Ivan Lazar Miljenovic<
ivan.miljeno...@gmail.com> wrote:
Well, using the Char8 version.
Just because you *could* do that, it doesn't mean that you *should*. It's a
bad idea to use bytestrings for manipulating text,
On 5/25/11 1:56 PM, Antoine Latter wrote:
On May 25, 2011 12:50 PM, wrote:
Quoting Antoine Latter:
The only thing I'd add would be the additional actions "ReplacedBy",
"ExtendedBy" and "RedesignedBy".
I was actually thinking that this was the part that HackageDB could do
automatically on the
On 5/25/11 1:37 PM, Antoine Latter wrote:
On May 25, 2011 11:08 AM, "KQ" wrote:
At the risk of returning to a recurring theme that often comes up but
never gets resolved satisfactorily, I'd like to make a cabal proposal:
Add to the .cabal file the following optional field:
Related-pa
On 2011 May 25, at 23:20, Brandon Moore wrote:
From: Jacek Generowicz Sent: May 25, 2011 2:45 PM
I feel a bit guilty about spamming the list with all my stupid
problems: I would
prefer to find my own way around, but if I had to dive in and
rummage around the
source for every problem that
On 2011 May 25, at 16:09, Mark Wright wrote:
Hi Jacek,
Hi Mark,
Thanks once again for your excellent answer.
The show module names were changed in the upgrade from show 0.3.4 to
show 0.4.1.1.
OK, I see that in show.cabal, ShowIO disappears from the exposed-
modules section. This is conf
> From: Jacek Generowicz Sent: May 25, 2011 2:45 PM
> On 2011 May 25, at 17:42, Gwern Branwen wrote:
>
>> On Wed, May 25, 2011 at 11:08 AM, Jacek Generowicz
>> wrote:
>>
>>> I've already stumbled across mueval and hoogle as things that need
> to be
>>> installed separately before the full
On 2011-05-25 16:19 -0400, Matthew Steele wrote:
> From Haskell, I want to call a C function that returns a struct by
> value (rather than, say, returning a pointer). For example:
>
>typedef struct { double x; double y; } point_t;
>point_t polar(double theta);
>
> I can create a Haske
From Haskell, I want to call a C function that returns a struct by
value (rather than, say, returning a pointer). For example:
typedef struct { double x; double y; } point_t;
point_t polar(double theta);
I can create a Haskell type Point and make it an instance of Storable
easily enough
fltk supports OpenGL on windows, X11, and OS X, though I've never used
it. The thing it doesn't have is a haskell binding, but as I
mentioned I just bind whatever I need when I need it and since I don't
need much it's easy. Dunno if this applies in your case though.
Maybe it's my NIH, but I like
2011/5/25 Jonas Almström Duregård
> I don't see the similarity (from reading this:
> http://www.haskell.org/haskellwiki/Idiom_brackets). My suggestion is
> just a way of using layout to avoid parenthesis.
>
>
This is "exactly" the applicative style, where idiom brackets come from.
Use Control.Ap
On 2011 May 25, at 17:42, Gwern Branwen wrote:
On Wed, May 25, 2011 at 11:08 AM, Jacek Generowicz
wrote:
I've already stumbled across mueval and hoogle as things that need
to be
installed separately before the full advertized features of
lambdabot work.
With this experience under my bel
On 2011 May 25, at 21:04, Neil Mitchell wrote:
Hi Jacek,
Hi Neil,
Any pointers to the least painful way of getting 'hoogle data' to
work on OS
X?
Set up a shell alias so wget just calls curl?
Their interfaces are different. (Though maybe there's some option
which makes curl sufficie
One drastic approach I've used in personal libraries--operator-heavy EDSLs
specifically--is to define everything first with alphanumeric names, then
put operators in their own modules. In some cases I'd have three such
modules: One providing a minimal set of operators that don't clash with
anything
Hi Jacek,
> Which works swimmingly on Ubuntu, but fails on OS X, because wget seems to
> be hard-wired. I seem to recall that at least one of the packages that I
> installed over the last 2 days, automatically selected wget on Ubuntu, and
> curl on OS X.
I see someone raised a bug for this:
http:
Thanks, John. Encouraging bit of news. Please do let us know what you learn
when you try. - Conal
On Tue, May 24, 2011 at 1:28 AM, John Lato wrote:
> You can use gtkglext to get OpenGL support. With the official release of
> gtkglext-1.2.0 there's a bit of hacking involved (that was probably
Hi Niklas,
>> I use Uniplate inside HLint, and it's invaluable - there are a lot of
>> times when List Comp + universeBi really hits the spot.
>
> +1 on that, I use uniplate for pretty much all my haskell-src-exts tasks
> these days, works like a charm!
> I'd love to include some standard traversa
> +1 on that, I use uniplate for pretty much all my haskell-src-exts tasks
> these days, works like a charm!
> I'd love to include some standard traversal functionality in
> haskell-src-exts that depends on uniplate, but hesitate to do so because of
> HP aspirations for haskell-src-exts. Neil, what
I wanted the second set because I may want to establish the link even if I'm
not the maintainer of the second package.
I would imagine that the second set of actions would be otherwise identical,
and the link would show up on either package regardless of which set of
verbs was used.
Antoine
On Ma
Quoting Antoine Latter :
> On May 25, 2011 11:08 AM, "KQ" wrote:
> >
> > The HackageDB could the provide this information in the description page
> of a package, and it could even automatically cross-reference and supplement
> the referred package descriptions, so that if you are looking at the P
On May 25, 2011 11:08 AM, "KQ" wrote:
>
> On Wed, 25 May 2011 05:17:46 -0700, Stephen Tetley <
stephen.tet...@gmail.com> wrote:
>
>> Hi Ivan
>>
>> Forks are good, no?
>>
>> The Parsec experience has suggested to me at least, that new author's
>> "capping" another author's work by bumping up to a m
On Wed, May 25, 2011 at 5:59 AM, Ivan Lazar Miljenovic <
ivan.miljeno...@gmail.com> wrote:
> Well, using the Char8 version.
>
Just because you *could* do that, it doesn't mean that you *should*. It's a
bad idea to use bytestrings for manipulating text, yet the only plausible
reason to have wl-ppr
On Wed, May 25, 2011 at 5:01 AM, Ivan Lazar Miljenovic <
ivan.miljeno...@gmail.com> wrote:
> With my wl-pprint-text package, Jason Dagit suggested to me on
> #haskell that it would make sense to make such a pretty-printer be
> class-based so that the same API could be used for String, ByteString,
On Wed, 25 May 2011 05:17:46 -0700, Stephen Tetley
wrote:
Hi Ivan
Forks are good, no?
The Parsec experience has suggested to me at least, that new author's
"capping" another author's work by bumping up to a major version,
causes a significant difficulties even when the original author has
go
On Wed, May 25, 2011 at 11:08 AM, Jacek Generowicz
wrote:
> Quite possibly not, but it would it be too much to ask, to have the
> documentation mention that they need to be installed separately if you
> intend to use them through lambdabot?
I've just added them to the dependencies.
> I've alread
On Wed, 18 May 2011 20:01:48 -0700, wren ng thornton wrote:
3. Using the web as Haskell's main method of non-command line
(graphical) deployment seems to lose two of Haskell's most powerful
features: its type safety, and its speed.
I agree with these disagreements. Web apps have long been toute
I don't see the similarity (from reading this:
http://www.haskell.org/haskellwiki/Idiom_brackets). My suggestion is
just a way of using layout to avoid parenthesis.
/J
2011/5/25 Brandon Allbery :
> 2011/5/25 Jonas Almström Duregård
>>
>> Would it be possible to allow this in Haskell (where is s
On 2011 May 25, at 16:41, Gwern Branwen wrote:
On Wed, May 25, 2011 at 6:22 AM, Jacek Generowicz
wrote:
I had assumed that it connected to a server.
It did at one point, but Hoogle had downtime and the local hoogle
command was just as good and worked offline.
Makes sense.
(Maybe my ass
Hi Ivan
empty is fine as is, obviously with a Monoid instance as well, people
can choose to use mempty which removes potential name clashes.
I was thinking of (<$>) and (<+>), though I was forgetting that (<+>)
is actually ArrowPlus.
If you are mostly gifting angles as notation to Applicative, m
On Wed, May 25, 2011 at 6:22 AM, Jacek Generowicz
wrote:
> I had assumed that it connected to a server.
It did at one point, but Hoogle had downtime and the local hoogle
command was just as good and worked offline.
> (Maybe my assumption was not entirely unfounded, given that the installation
>
On Wed, 25 May 2011 13:20:19 +0200, Jacek Generowicz
wrote:
> Hi Mark,
>
> Thanks for your wonderfully lucid, concise and complete explanation of
> the problem and its solution (included below).
>
> When I apply your patch and reinstall lambabot, I now get the
> following problem:
>
> lamb
On 25 May 2011 23:23, Otakar Smrz wrote:
>
> I took over the maintenance of wl-pprint since Stefan suggested it
> himself. I needed to include OverlappingInstances, because that was
> required to make better use of the library (there is a difference having
> this flag there, which is consistent wi
On 25 May 2011 22:52, Johan Tibell wrote:
> On Wed, May 25, 2011 at 2:01 PM, Ivan Lazar Miljenovic
> wrote:
>> With my wl-pprint-text package, Jason Dagit suggested to me on
>> #haskell that it would make sense to make such a pretty-printer be
>> class-based so that the same API could be used for
(Changing the subject as it's going off-topic from the original email :p)
On 25 May 2011 22:45, Simon Meier wrote:
> 2011/5/25 Ivan Lazar Miljenovic :
>>
>> Also, by clashes with Applicative, are you referring to empty and <$>
>> ? I'm not sure if a better name than "empty" can be found; as for
On Wed, May 25, 2011 at 2:01 PM, Ivan Lazar Miljenovic
wrote:
> With my wl-pprint-text package, Jason Dagit suggested to me on
> #haskell that it would make sense to make such a pretty-printer be
> class-based so that the same API could be used for String, ByteString,
> Text, etc.
I'm a bit skept
2011/5/25 Ivan Lazar Miljenovic :
> On 25 May 2011 22:17, Stephen Tetley wrote:
>> Hi Ivan
>>
>> Forks are good, no?
>>
>> The Parsec experience has suggested to me at least, that new author's
>> "capping" another author's work by bumping up to a major version,
>> causes a significant difficulties
On 25 May 2011 22:17, Stephen Tetley wrote:
> Hi Ivan
>
> Forks are good, no?
>
> The Parsec experience has suggested to me at least, that new author's
> "capping" another author's work by bumping up to a major version,
> causes a significant difficulties even when the original author has
> gone.
2011/5/25 Jonas Almström Duregård
> Would it be possible to allow this in Haskell (where is some
> new operator or keyword):
>
> f {x a;y b;z c}
>
Sounds like idiom brackets to me.
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Hi Ivan
Forks are good, no?
The Parsec experience has suggested to me at least, that new author's
"capping" another author's work by bumping up to a major version,
causes a significant difficulties even when the original author has
gone.
As for wl-pprint, it was a very tidy library in its origin
With my wl-pprint-text package, Jason Dagit suggested to me on
#haskell that it would make sense to make such a pretty-printer be
class-based so that the same API could be used for String, ByteString,
Text, etc.
I was thinking of doing so, and in such a case it would probably make
the most amount
On 2011 May 25, at 13:10, Mark Wright wrote:
I assume your test on OS X was with the latest hoogle version so that
old issues would no longer be relevant:
I would be surprised if it weren't the latest, as I started installing
everything from scratch a couple of days ago.
Anyway, my hoogle
Hi Mark,
Thanks for your wonderfully lucid, concise and complete explanation of
the problem and its solution (included below).
When I apply your patch and reinstall lambabot, I now get the
following problem:
lambdabot> check True
Could not find module `ShowIO`:
It is a member of the
Yes, very nice. Thanks.
Michael
--- On Wed, 5/25/11, Henning Thielemann
wrote:
From: Henning Thielemann
Subject: Re: [Haskell-cafe] Code critique - Was [Maybe Int] sans Nothings
To: "michael rice"
Cc: "Haskell Cafe"
Date: Wednesday, May 25, 2011, 3:41 AM
Alexander Solla schrieb:
> buil
On Wed, 25 May 2011 12:22:24 +0200, Jacek Generowicz
wrote:
>
> On 2011 May 25, at 05:53, Mark Wright wrote:
>
> > On Wed, 25 May 2011 02:20:39 +0200, Jacek Generowicz
> > > > wrote:
> >> I have recenly installed lambdabot. Its response to *each* *and*
> >> *every* hoogle command is *always*
So it seconds my initial point: you can't store the size because it has no
sense.
2011/5/25 Ketil Malde
> "Richard O'Keefe" writes:
>
> >> Then tell me, why does calculating the length of a (Haskell)
> >> list has O(n) complexity.
>
> > Because it is a rather rare operation and the cost of doin
On 2011 May 25, at 05:53, Mark Wright wrote:
On Wed, 25 May 2011 02:20:39 +0200, Jacek Generowicz > wrote:
I have recenly installed lambdabot. Its response to *each* *and*
*every* hoogle command is *always*
A Hoogle error occurred.
I'm hoping that someone on Cafe might be able to offer a
On Tue, May 24, 2011 at 7:18 PM, Neil Mitchell wrote:
> >> Before doing a code review I always demand that the author runs over
> >> the code with HLint (http://community.haskell.org/~ndm/hlint) - they
> >
> > Very good point. In fact you just inspired me to finally download it
> > and run it on
>
> From: Neil Mitchell
>
> > While I'm on the topic, I recently wrote a tool that wanted to
> > traverse deep data structures as produced by haskell-src-exts. ?I
> > wound up with about 50 lines of case expressions and around the time
> > my hands were literally beginning to hurt decided that eno
Hi,
Would it be possible to allow this in Haskell (where is some
new operator or keyword):
f {x a;y b;z c}
As an equivalent to:
f (x a) (y b) (z c)
Of course my intention is that the new keyword should initiate layout syntax
so we can write this:
f
x a
y b
z c
In addition to the cas
Yep, works fine now, thanks!
/Niklas
On Tue, May 24, 2011 at 2:52 PM, Ross Paterson wrote:
> Version skew problem -- I hope it's fixed now.
>
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> http://www.haskell.org/mailman/listinfo/haskel
Fellow Haskelleers,
I'm pleased to announce the release of haskell-src-exts-1.11.1!
* On hackage: http://hackage.haskell.org/package/haskell-src-exts
* Via cabal: cabal install haskell-src-exts
* Darcs repo: http://code.haskell.org/haskell-src-exts
This major release fixes some long-standing bu
"Richard O'Keefe" writes:
>> Then tell me, why does calculating the length of a (Haskell)
>> list has O(n) complexity.
> Because it is a rather rare operation and the cost of doing
> this would be far higher than you think.
I suspect that if you store the length non-strictly, it would build up
Submission deadline: June 25, 2011
Invited speakers: Mats Rooth (Cornell), Noam Zeilberger (Universite' Paris 7)
There will be a tutorial session in the evening before the workshop.
ACM SIGPLAN Continuation Workshop 2011
http://logic.cs.tsukuba.ac.jp/cw2011/
co-located w
Alexander Solla schrieb:
> buildMap :: GeneratorState1 (Map Prefix [String])
> buildMap = do (mp,(pfx1,pfx2),words) <- get
> if (Prelude.null words)
> then {- No more words. Return final map (adding
> non_word for final prefix). -}
>
Tony Morris schrieb:
> On 25/05/11 16:46, Eugene Kirpichov wrote:
>> data FList a = FNil | FCons Int a (FList a)
>> empty = FNil
>> len FNil = 0
>> len (FCons n _) = n
>> cons x xs = FCons (1 + len xs) x xs
>> tail (FCons _ _ xs) = xs
> My mistake, sorry. Currently looking for original reason to ha
I wrote:
>> It's not a good idea for a basic time
>> library to introduce possible crashes. At least you should
>> provide an alternative safe interface. Similarly for toEnum.
Chris Heller wrote:
> are you suggesting something like doing modulo arithmetic rather
> than calling error on undefined v
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