On 04/22/11 01:34 AM, Maciej Marcin Piechotka wrote:
On Thu, 2011-04-21 at 21:29 +0100, Andrew Coppin wrote:
I'm sure this must be a VFAQ, but... There seems to be universal
agreement that Darcs is a nice idea, but is unsuitable for real
projects. Even GHC keeps talking about getting rid of
On Fri, Apr 22, 2011 at 03:46, Richard Cobbe co...@ccs.neu.edu wrote:
Unfortunately, that's not happening. Cabal is clearly generating the
module; I can see it in dist/build/autogen. But my copy is overriding the
autogenerated one, even for cabal builds -- at least, that's what I'm
seeing
Jason Dagit schrieb:
* Every commit needs --ask-deps , because the automatic
dependency detector can only detect automatic changes (and not
things like adding a new function in a different module)
You mean it can only detect dependencies that depend on each
Maciej I believe the biggest problem was (i.e. when migration started)
Maciej that there is no big-name-hosting supporting darcs. When
Maciej code.haskell.org went down people were cut off from code.
Please forgive me if the answer is obvious : is Darcs storage backend
agnostic, or must it
Good chance you've already read this but if not here is a good post by
Linus about his take on the problems with darcs:
http://markmail.org/message/vk3gf7ap5auxcxnb
I personally think he is right on the money here. The other problem
with Darcs is performance. While it has improved a lot its
On Thu, 2011-04-21 at 19:39 -0500, Jake McArthur wrote:
On Thu, Apr 21, 2011 at 7:31 PM, Maciej Marcin Piechotka
uzytkown...@gmail.com wrote:
Last time I checked it disallowed my as 5 depended on 4 which depended
on 3 which depended on 2 which depended on 1 as all changed x.hs
Merely
Hi,
I tested with Haskell platform 2011 with QuickCheck 2.4.0.1.
It produced 100 cases passed, but can't report failed case.
verboseCheck still told me that [(), (), ... ()] are generated as
instance to (Ord a)
The only way is to specify the non-ambitious type for example, Int,
like below:
test
Hi,
I thought about implementing memoization which could be applied
globally to Haskell as an optimization.
I also asked the question (in a bit different way) here:
http://stackoverflow.com/questions/5749039/automatic-memoizing-in-functional-programming-languages
When you want to do that, the
On Tue, 2011-04-19 at 10:02 -0300, Felipe Almeida Lessa wrote:
Now, that's what I get from reading the code. I don't remember if it
is explicitly allowed or forbidden for an iteratee to generate
leftovers out of nowhere. My guess is that it doesn't make much sense
to allow it.
For the
On Fri, Apr 22, 2011 at 5:54 AM, Maciej Marcin Piechotka
uzytkown...@gmail.com wrote:
For the record: such code is therefore illegal
abab :: Iteratee Char Identity ()
abab = continue parseA
where parseA (Chunks ('a':'b':xs)) = parseA (Chunks xs)
parseA (Chunks ('a':[])) =
Yesterday we uploaded our official 0.10.0 release (0.10.0.4) to Hackage
and we have Windows and OS X installers at http://leksah.org/download.html
Anyone using an earlier version should upgrade.
This release is mainly small improvements and bug fixes. Some of the
improvements include:
* Better
On 22 April 2011 09:50, Albert Zeyer alb...@googlemail.com wrote:
[SNIP]
I would be interested in implementing such thing myself as an addon
for GHC and doing some benchmarks. Could you maybe:
- Give me some hints where to start in GHC? I never really have worked
on GHC so far.
- Suggest some
On Fri, Apr 22, 2011 at 12:55 PM, Stephen Tetley
stephen.tet...@gmail.com wrote:
There isn't much value to automatic memoization as people have already
pointed out on SO - if you believe otherwise, you're probably better
off proving a case on paper first before attempting to implement it in
On Thu, Apr 21, 2011 at 11:27:10PM -0500, Antoine Latter wrote:
1. A side note - using the 'cabal' command line tool is easier for
many tasks than 'runhaskell Setup'. In particular, it does a user
install by default.
Interesting -- didn't know that was possible. I didn't see that in the
Cabal
On Fri, Apr 22, 2011 at 09:23:32AM +0200, Max Rabkin wrote:
On Fri, Apr 22, 2011 at 03:46, Richard Cobbe co...@ccs.neu.edu wrote:
Unfortunately, that's not happening. Cabal is clearly generating the
module; I can see it in dist/build/autogen. But my copy is overriding the
autogenerated
Hi Albert
My contention is that there are specific programs (or specific
functions within them) that memoization improves - hence adding
memoization to those programs rather than the compiler is the way to
go.
Not that I've looked deeply, but I think adding memoization to GHC
would be a pretty
Some weeks ago, I mirrored the hugs repo to github.
(https://github.com/fuzxxl/Hugs) This was, when I found out, that the
last commit was about 2 years ago. Also, since some of the dependencies
moved, I was unable to build hugs.
Now my question is: Is Hugs dead? What's the status of development
Hi,
I was mostly thinking about automatic memoization, i.e. not explicit
memoization.
Also, it should only add some small constant overhead for each
function and maybe leads to huge improvements after all. But maybe I'm
also wrong and for an average function it doesn't lead to
improvements.
But
On Friday 22 April 2011 13:57:36, Richard Cobbe wrote:
On Thu, Apr 21, 2011 at 11:27:10PM -0500, Antoine Latter wrote:
1. A side note - using the 'cabal' command line tool is easier for
many tasks than 'runhaskell Setup'. In particular, it does a user
install by default.
Interesting --
On 4/21/11 10:16 PM, wren ng thornton wrote:
rather, what I'd like is someplace to keep my code which also provides a
good bugtracker. Unfortunately, neither darcsden nor patchtag offer
darcsden does include a simple issue tracker now.
___
On Fri, 2011-04-22 at 05:51 +0400, Richard Cobbe wrote:
I did some googling and came across a blog post
(http://neilmitchell.blogspot.com/2008/02/adding-data-files-using-cabal.html)
which suggested that I provide my own Paths_pkg.hs file that points to
the
files' location in the development
On Fri, Apr 22, 2011 at 5:16 AM, Robert Clausecker fuz...@gmail.com wrote:
Now my question is: Is Hugs dead? What's the status of development of
hugs?
It's been unmaintained for years now.
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
Hi Albert
You could try benchmarking with DeltaML instead - DeltaML is the only
language I can think of where memoization is (nearly) pervasive,
though you need still need to mark memo functions with a keyword as
far as I'm aware. This would be a lot easier than modifying GHC:
Here's a simple issue that's been with me for a while. As do many
people, I use plural variable names for lists, so if a Block as called
'block' then [Block] is 'blocks'.
The other pattern that comes up a lot is 'Maybe Block'. When I have
to name it, I call it 'maybe_block', e.g.
maybe_block -
Strong recommendation is to use the Haskell Platform and GHC as your
development base, unless you have very specific reasons to use Hugs or
one of the other compilers.
-- Don
On Fri, Apr 22, 2011 at 5:16 AM, Robert Clausecker fuz...@gmail.com wrote:
Some weeks ago, I mirrored the hugs repo to
In my own code, I usually use a 'mb' prefix with camelCase, like so:
case mbStr of
Just str - ...
Nothing - ...
But I agree that it doesn't always look very nice. I'm curious what
others do.
On Apr 22, 2011, at 1:14 PM, Evan Laforge wrote:
Here's a simple issue that's been with
hi all
i was wondering if anyone could post some minimal examples on using
mutable Vectors in the ST monad. i've been digging around in the usual
places but haven't been able to find anything to get me over the hump
thanks in advance
brad
___
I do it in a similar way, not just for maybes:
paramMay - getHTTPPostParam Param
paramStr - maybe (throwError No Param parameter) return paramMay
let paramE = parseParam paramStr
param - case paramE of
Left e - throwError $ Error while parsing Param: ++ show e
Right p - return p
It'd be great,
On Fri, 22 Apr 2011, Evgeny Tarasov wrote:
I do it in a similar way, not just for maybes:
paramMay - getHTTPPostParam Param
paramStr - maybe (throwError No Param parameter) return paramMay
let paramE = parseParam paramStr
param - case paramE of
Left e - throwError $ Error while parsing Param:
Hi Evan
The EHC compiler code base seems to use mbSomething as a convention.
As EHC has quite a lot of textual information in its source - the code
is Haskell + attribute grammars + Shuffle + plus more - the mb
convention seems to work well and I adopted it for myself after seeing
it there.
In my tutorial on using vectors,
http://www.haskell.org/haskellwiki/Numeric_Haskell:_A_Vector_Tutorial
There's some examples:
http://www.haskell.org/haskellwiki/Numeric_Haskell:_A_Vector_Tutorial#Impure_Arrays
that work in IO, and should work equally well in ST (as vectors are
parameterized by
Hi Brad
I think all you can do with an ST array is covered by the MArray class
and its derived operations - note the class is exported opaquely from
Data.Array.MArray - it has these two members that aren't exported so
aren't documented:
unsafeRead :: Ix i = a i e - Int - m e
unsafeWrite :: Ix
By the way, I'd like to use hugs extensively as sysadmin's universal
scripting language. I think, it could be a great killer feature. But as
far as I know, it doesn't have any facilities to run external programs
and process their stdout, stderr end exit code.
Hugs is much more suitable for
Of course, naming will always be a matter of taste. For instance I would not
write maybe_something, because I prefer camel case, that is, maybeSomething.
On the other hand, I already wrote some Wiki articles that you may read as
suggestions for certain naming conventions:
On Sat, 23 Apr 2011, Evgeny Tarasov wrote:
By the way, I'd like to use hugs extensively as sysadmin's universal
scripting language.
Hugs is better in this respect because it starts much faster than runghc.
I think, it could be a great killer feature. But as far as I know, it
doesn't have
Hi Cédric,
I saw your post on Maybe types wondering what the point of it is and why
anyone would want it. I thought I'd reply by email as I don't want to
infringe on your freedom of expression. If you find that I'm saying things
you already know, please scroll down to the bottom, which addresses
On Fri, 22 Apr 2011, Christopher Done wrote:
Use of Fantom's save invoke and Maybe are more or less the same.
-- Hard way
email = if userList /= Nothing
then let user = findUser bob (fromJust userList)
in if user /= Nothing
then getEmail
On 22 April 2011 21:26, Henning Thielemann lemm...@henning-thielemann.dewrote:
In idiomatic Haskell you would write
case userList of
Nothing - Nothing
Just plainUserList =
let user = findUser bob plainUserList
...
since (userList /= Nothing) requires an Eq instance without
On Fri, 2011-04-22 at 21:26 +0200, Henning Thielemann wrote:
On Fri, 22 Apr 2011, Christopher Done wrote:
Use of Fantom's save invoke and Maybe are more or less the same.
-- Hard way
email = if userList /= Nothing
then let user = findUser bob (fromJust userList)
On Fri, 22 Apr 2011, Maciej Marcin Piechotka wrote:
On Fri, 2011-04-22 at 21:26 +0200, Henning Thielemann wrote:
In idiomatic Haskell you would write
case userList of
Nothing - Nothing
Just plainUserList =
let user = findUser bob plainUserList
...
since (userList /=
Well, Maybe IS a monad, so I just use m prefix.
Отправлено с iPhone
Apr 22, 2011, в 21:14, Evan Laforge qdun...@gmail.com написал(а):
Here's a simple issue that's been with me for a while. As do many
people, I use plural variable names for lists, so if a Block as called
'block' then [Block]
On Friday 22 April 2011 20:14:38, Stephen Tetley wrote:
Hi Brad
I think all you can do with an ST array is covered by the MArray class
and its derived operations - note the class is exported opaquely from
Data.Array.MArray - it has these two members that aren't exported so
aren't
I'm pleased to announce hledger 0.14. This release includes work by
Dmitry Astapov, Eric Kow, Max Bolingbroke, Omari Norman and myself.
Thanks especially to Dmitry for helping me with release wrangling.
binaries for linux, mac, windows: http://hledger.org/DOWNLOADS.html
(64-bit linux
Guys --
I picked up leksah again after a long break (macosx install problem). I have
been using leksah for the past two weeks on Ubuntu. Great work! The ability
to browse and search libraries for type information and source is fantastic.
I love it! All you need now is to let me fill out the
You wouldn't be so confused if you had actually looked at Lato's implementation
and compared it to Oleg's most recent version.
Regards,
John A. De Goes
Twitter: @jdegoes
LinkedIn: http://linkedin.com/in/jdegoes
On Apr 21, 2011, at 6:27 PM, Jason Dagit wrote:
On Thu, Apr 21, 2011 at
On 4/22/11 11:39 AM, Simon Michael wrote:
On 4/21/11 10:16 PM, wren ng thornton wrote:
rather, what I'd like is someplace to keep my code which also provides a
good bugtracker. Unfortunately, neither darcsden nor patchtag offer
darcsden does include a simple issue tracker now.
Ah,
On 4/22/11 8:16 AM, Robert Clausecker wrote:
Some weeks ago, I mirrored the hugs repo to github.
(https://github.com/fuzxxl/Hugs) This was, when I found out, that the
last commit was about 2 years ago. Also, since some of the dependencies
moved, I was unable to build hugs.
Now my question is:
On 4/22/11 3:26 PM, Henning Thielemann wrote:
On Fri, 22 Apr 2011, Christopher Done wrote:
Use of Fantom's save invoke and Maybe are more or less the same.
-- Hard way
email = if userList /= Nothing
then let user = findUser bob (fromJust userList)
in if user /=
On 4/22/11 1:14 PM, Evan Laforge wrote:
Here's a simple issue that's been with me for a while. As do many
people, I use plural variable names for lists, so if a Block as called
'block' then [Block] is 'blocks'.
The other pattern that comes up a lot is 'Maybe Block'. When I have
to name it, I
On Fri, 2011-04-22 at 22:11 +0200, Henning Thielemann wrote:
On Fri, 22 Apr 2011, Maciej Marcin Piechotka wrote:
On Fri, 2011-04-22 at 21:26 +0200, Henning Thielemann wrote:
In idiomatic Haskell you would write
case userList of
Nothing - Nothing
Just plainUserList =
Most of the (non-IO) runtime errors I get using Haskell software is due to
head or fromJust, it's actually quite annoying.
Just singling this one out because I've heard it before. I've never
gotten a runtime error from these. It seems quite easy to just not
use these functions.
It's already
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