On Thu, Dec 16, 2010 at 3:56 PM, Magicloud Magiclouds
magicloud.magiclo...@gmail.com wrote:
On Thu, Dec 16, 2010 at 3:48 PM, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
On 16 December 2010 18:30, Magicloud Magiclouds
magicloud.magiclo...@gmail.com wrote:
On Thu, Dec 16, 2010 at
On 16 December 2010 19:06, Magicloud Magiclouds
magicloud.magiclo...@gmail.com wrote:
Oh, clean job around ~/.ghc and ~/.cabal has been done. No luck.
Sounds like a dodgy GHC install then; I believe lispy on #haskell has
reported similar problems.
--
Ivan Lazar Miljenovic
On Thu, Dec 16, 2010 at 4:07 PM, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
On 16 December 2010 19:06, Magicloud Magiclouds
magicloud.magiclo...@gmail.com wrote:
Oh, clean job around ~/.ghc and ~/.cabal has been done. No luck.
Sounds like a dodgy GHC install then; I believe lispy
On 16/12/2010 00:37, John D. Ramsdell wrote:
On Wed, Dec 15, 2010 at 7:59 AM, Simon Marlowmarlo...@gmail.com wrote:
The -M flag causes the GC algorithm to switch from copying (fast but
hungry) to compaction (slow but frugal) as the limit approaches.
Ah, so that's what it's doing. My
I write docs for my iteratee-like library and I have problem with
lhs2tex. When I execute lhs2tex and then latex, I get a document with
long typesignatures and expressions expanded beyound page margins. I
attached a sourcefile I have problem with. Can someone give me an advise
how to force long
On 07/12/2010 21:30, Mitar wrote:
Hi!
On Wed, Dec 1, 2010 at 10:50 AM, Simon Marlowmarlo...@gmail.com wrote:
Yes, but semantics are different. I want to tolerate some exception
because they are saying I should do this and this (for example user
interrupt, or timeout) but I do not want others,
Simon Marlow marlo...@gmail.com writes:
ulimit is a good way to catch an infinite loop. But it's not a good
way to tell GHC how much memory you want to use - if GHC knows the
memory limit, then it can make much more intelligent decisions about
how to manage memory.
I'm interpreting this
Magicloud Magiclouds magicloud.magiclouds at gmail.com writes:
Really hoping cabal has some kind of way to ignore these version thing.
+1, sort of.
Really, when moving to ghc-7 I found the most annyoing thing
is upper version bounds in cabal files.
This makes cabal-install all too eager to
What ghc version should I use and where do I get it?
I found a ghc-6.13.20100108 snapshot somewhere on my hard disk
and this seems to contain a working dph-par.
At least I get some noticeable speedups in some of the benchmarks
(didn't try them all, for lack of time).
Perhaps the dph team
I think you have to do it yourself. lhs2TeX isn't that clever - it
doesn't really know haskell syntax, it just applies some very simple
transformation rules.
e.g. change
runE :: Monad m = Enumerator e s m - m r - (e - m r) - (s -
Enumerator e s m - m r) - m r
to
runE :: Monad m = Enumerator e
On Mon, Dec 13, 2010 at 9:30 PM, Brent Yorgey byor...@seas.upenn.eduwrote:
Hi all,
Today I wanted this function
strongLocal :: (MonadReader r1 m1, MonadReader r2 m2) =
(r2 - r1) - m1 a - m2 a
Of course, after staring at this type for ten seconds I realized that
it cannot
On Thu, Dec 16, 2010 at 12:23 AM, Permjacov Evgeniy permea...@gmail.comwrote:
On 12/15/2010 05:48 PM, John Lato wrote:
From: Permjacov Evgeniy permea...@gmail.com
current links
https://github.com/permeakra/Rank2Iteratee
https://github.com/permeakra/PassiveIteratee
The main difference
Hi,
I am trying to make happstack work in my box, which is using ghc 7.
While compiling HStringTemplate, which I did a little modification
to make it work, I found that it does not work with
template-haskell-2.5.0.0. I changed it to use
template-haskell-2.4.0.1. This step worked fine.
Then I
Am 15.12.2010 08:36, schrieb Roman Cheplyaka:
* Jonathan Geddes geddes.jonat...@gmail.com [2010-12-14 19:59:14-0700]
Quick question:
Why do I need the $ in the following bits of code?
main = withSocketsDo $ do
--do something with sockets
foo = fromMaybe 0 $ do
--do something in the
On Thursday 16 December 2010 07:20:18, z_axis wrote:
canot it be fixed ?
Can you try it with a higher verbosity level, -v3, to get more information
where and why it fails?
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Hi there,
The only version of template haskell which will work is the version
that the compiler was built against. So if you're working with ghc-7,
it is 2.5 or nothing.
Why doesn't HStringTemplate work with 2.5.0.0? What error were you getting?
Antoine
On Thu, Dec 16, 2010 at 6:23 AM,
On Thu, Dec 16, 2010 at 10:08:23AM +, Johannes Waldmann wrote:
But: I'm always puzzled by build-dependencies like A = 3.4.5.
With the major.minor.release scheme,
a change in release means no API change (just bugfix),
in minor means compatible extension of API,
and only major changes can
On Thursday 16 December 2010 11:08:23, Johannes Waldmann wrote:
But: I'm always puzzled by build-dependencies like A = 3.4.5.
With the major.minor.release scheme,
a change in release means no API change (just bugfix),
in minor means compatible extension of API,
and only major changes can
Daniel Fischer daniel.is.fischer at googlemail.com writes:
Maybe a flag ignore upper bounds and try with the latest for cabal
+1
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On 16 December 2010 13:38, Daniel Fischer
daniel.is.fisc...@googlemail.com wrote:
The problem is that without upper bounds, things will break a lot when
packages undergo API changes, but probably more often things will also work
with the new API. So with upper bounds, you prevent breakage at
Daniel Fischer daniel.is.fisc...@googlemail.com writes:
Or: it breaks with a bug introduced in 3.4.6 which hasn't yet been fixed.
This is an important point, I think: API breakages are not always
intentional. Except for base, I generally don't specify upper bounds
(well, maybe this is laziness
Hi cafe,
I've published a large presentation about two Haskell-based tools of
mine - tplot and splot.
Their motto is visualize system behavior from logs with a shell one-liner.
Based on my experience, they usually seem to live up to this motto.
On Thursday 16 December 2010 15:40:37, Duncan Coutts wrote:
On 16 December 2010 13:38, Daniel Fischer
daniel.is.fisc...@googlemail.com wrote:
The problem is that without upper bounds, things will break a lot when
packages undergo API changes, but probably more often things will also
work
actually, IRL the code works as expected. Might it be possible that
the speed of test execution is greater than the granularity of the
system's modification timestamp?
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Okay, I started to experiment things, and I came to some remarks:
First, I cannot use bare lists, because of the way their Applicative
instance is declared.
I have to use the newtype ZipList (in Control.Applicative).
So I have roughly this :
import Control.Applicative
newtype AgentSig a =
On 15/12/2010 14:31, Lennart Augustsson wrote:
Yes, I think there should be a MonadFail distinct from MonadPlus.
Some types, like IO, are not in MonadPlus, but have a special implementation of
the fail method.
Personally, I think fail should just be removed, but that would break existing
On Thu, Dec 16, 2010 at 06:52:58PM +0100, Yves Parès wrote:
Okay, I started to experiment things, and I came to some remarks:
First, I cannot use bare lists, because of the way their Applicative
instance is declared.
I have to use the newtype ZipList (in Control.Applicative).
So I have
Greetings,
while developing my neural net simulator I stumbled upon a problem.
I have a data type NeuralNet and use Show and Read instances for saving
and loading configurations. As time passed, I changed the data type, so
the program can no longer load files saved in previous versions.
I
Dear Haskellians,
Just in time for the Holidays!
Best wishes,
--greg
-- Forwarded message --
From: Charles Torre cto...@microsoft.com
Date: Tue, Dec 14, 2010 at 11:31 AM
Subject: Part 2 is live!
To: Meredith Gregory lgreg.mered...@gmail.com
Hi Greg!
Part 2 is now live on
I haven't tested this idea, but it occurred to me that this might be a good
place for data families:
data Z = Z
newtype S n = S n
-- Some nastiness to avoid having to see into the future?
type family Pred n :: *
type instance Pred (S n) = n
type instance Pred Z = Z
class MyDataClass ver where
So in the result of (a = f), the first element is taken from the
first element of applying f to the first element of a; the second
element is the second element in the result of applying f to the second
element of a; and so on. Off the top of my head I am not sure what
this corresponds to in
Hi Antoine,
Rereading my earlier post, I can see I did not explain myself properly.
What I do now with sockets is:
1. Bind a socket to a port
2. Call Network.accept, then take the resultant Handle, and call forkIO
_twice_ with the handle. Making one thread that listens for incoming
messages
On Thu, Dec 16, 2010 at 12:03 PM, John Smith volderm...@hotmail.com wrote:
On 15/12/2010 14:31, Lennart Augustsson wrote:
Yes, I think there should be a MonadFail distinct from MonadPlus.
Some types, like IO, are not in MonadPlus, but have a special
implementation of the fail method.
Hi,
One more thing is missing after migration.
The link found on the cpphs package page at Hackage,
http://haskell.org/cpphs/
points to non-existing page.
Thanks.
--
Dimitry Golubovsky
Anywhere on the Web
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On Thu, Dec 16, 2010 at 12:56 PM, Daniel Peebles pumpkin...@gmail.com wrote:
I haven't tested this idea, but it occurred to me that this might be a good
place for data families:
data Z = Z
newtype S n = S n
-- Some nastiness to avoid having to see into the future?
type family Pred n :: *
On Thu, Dec 16, 2010 at 2:38 PM, Mads Lindstrøm
mads.lindstr...@gmail.com wrote:
Hi Antoine,
Rereading my earlier post, I can see I did not explain myself properly.
What I do now with sockets is:
1. Bind a socket to a port
2. Call Network.accept, then take the resultant Handle, and call
Hi Antoine
On Thu, Dec 16, 2010 at 2:38 PM, Mads Lindstrøm
Maybe a better interface would be along the lines of:
-- | Do not use the handle when you are done!
openTLSConnection: Handle - { information? Maybe not needed} - IO
TLSConnection
And then some thread-safe operations on the
Hello,
You should use happstack-data for this (you do not need the other
happstack components to use happstack-data)*. It was created to solve
this exact problem.
happstack-data builds on type of the 'binary' library and adds
versioned data types and automatic version migration.
You
Yes, modification times are reported in seconds, so you'll have to
wait on average 0.5s for a file change to be visible via the
modification date. Due to buffers and filesystem optimisations it
might even take longer.
On 16 December 2010 16:50, Arnaud Bailly arnaud.oq...@gmail.com wrote:
If this is not a toy program I would really suggest using something that is
builtin in the OS of choice. On Linux there is inotify (
http://en.wikipedia.org/wiki/Inotify), but I'm pretty sure that other OSes
have similar interfaces. The modification time method seems really fragile
and I probably
On Thu, Dec 16, 2010 at 4:45 AM, Ketil Malde ke...@malde.org wrote:
In absence of any explicit limits, I think a sensible default is to set
maximum total memory use to something like 80%-90% of physical RAM.
This would be a poor choice on Linux systems. As I've argued
previously in this
Have you considered moving these packages that are unrelated to web
development into a separate namespace? I know that I never considered
looking under the happstack namespace simply because I never do webapps.
On Thu, Dec 16, 2010 at 5:09 PM, Jeremy Shaw jer...@n-heptane.com wrote:
Hello,
Hi!
On Thu, Dec 16, 2010 at 10:30 AM, Simon Marlow marlo...@gmail.com wrote:
I've thought about whether we could support resumption in the past. It's
extremely difficult to implement - imagine if the thread was in the middle
of an I/O operation - should the entire I/O operation be restarted
On Thu, Dec 16, 2010 at 9:15 PM, Antoine Latter aslat...@gmail.com wrote:
Hi there,
The only version of template haskell which will work is the version
that the compiler was built against. So if you're working with ghc-7,
it is 2.5 or nothing.
Why doesn't HStringTemplate work with 2.5.0.0?
Sorry. I've had the patch sitting around but have been too busy/otherwise
occupied to push it. This gave me the necessary kick in the posterior.
HStringTemplate 0.6.6 is now on Hackage, and should work properly with ghc 7, I
think.
Cheers,
Sterl.
On Dec 16, 2010, at 6:21 PM, Magicloud
On Dec 16, 2010, at 5:48 PM, Daniel Peebles wrote:
Have you considered moving these packages that are unrelated to web
development into a separate namespace? I know that I never considered looking
under the happstack namespace simply because I never do webapps.
On Thu, Dec 16, 2010 at
Is there a (or more; the more, the better) tutorial for Haskell,
developing a whole application (of any kind: web, windows, console)?
I mean something like NerdDinner or MVC Music Store for ASP.NET MVC;
Or those whole applications in in Action books.
Thanks
Edit 1: Thanks to all for your
IO
On Thu, Dec 16, 2010 at 6:03 PM, John Smith volderm...@hotmail.com wrote:
On 15/12/2010 14:31, Lennart Augustsson wrote:
Yes, I think there should be a MonadFail distinct from MonadPlus.
Some types, like IO, are not in MonadPlus, but have a special
implementation of the fail method.
Hello,
I think that we should make both changes (make Applicative a
super-class of Monad, and remove the fail method from Monad). Code
will break but we can fix it.
By the way, just for reference, the proposal to have a separate
failure class and using it in the do notation, is how things used
On 17/12/2010, at 12:03 PM, Mitar wrote:
Yes, this is the same problem as when designing an operating system:
what should happen to a system call if it is interrupted. And I agree
with elegance of simply returning EINTR errno. This makes system calls
much easier to implement and for user it
On 10-12-16 06:49 PM, __kaveh__ wrote:
Is there a (or more; the more, the better) tutorial for Haskell,
developing a whole application (of any kind: web, windows, console)?
There is one developing a whole Scheme interpreter:
http://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours
This is a little off-topic, since it isn't specifically about Haskell, but
since Haskell is the home of the monad tutorial it isn't completely
irrelevant. The monad tutorial genre is well-known; it's often written
somebody who has just learned the concept trying to explain it, often in
highly
Yes, that works. Thank you for the hard work.
On Fri, Dec 17, 2010 at 7:37 AM, Sterling Clover s.clo...@gmail.com wrote:
Sorry. I've had the patch sitting around but have been too busy/otherwise
occupied to push it. This gave me the necessary kick in the posterior.
HStringTemplate 0.6.6 is
Disclaimer: I'm not looking to start a favorite IDE flame war, or resurrect
Emacs vs. VIM vs. Yi vs. insert your favorite IDE here discussions.
I've been helping JP with EclipseFP, with the objective of evolving
EclipseFP into a relatively high productivity IDE for Haskell. EclipseFP
has the
Hi,
When I compiling happstack with ghc 7, I got an error:
src/Happstack/Server/Internal/Handler.hs:29:8:
Could not find module `NoPush':
Use -v to see a list of the files searched for.
I looked around, there is no clue for the module NoPush, except it
has a function call withNoPush.
oops. I got distracted when recording a patch and accidently recorded
some extra stuff that was not ready yet.
I pushed another patch which rolls back the premature changes. Sorry
about that :(
- jeremy
On Dec 16, 2010, at 8:02 PM, Magicloud Magiclouds wrote:
Hi,
When I compiling
On Dec 16, 2010, at 4:48 PM, Daniel Peebles wrote:
Have you considered moving these packages that are unrelated to web
development into a separate namespace? I know that I never
considered looking under the happstack namespace simply because I
never do webapps.
Yes. I have been wanting
Seems working. Thank you.
On Fri, Dec 17, 2010 at 11:36 AM, Jeremy Shaw jer...@n-heptane.com wrote:
oops. I got distracted when recording a patch and accidently recorded some
extra stuff that was not ready yet.
I pushed another patch which rolls back the premature changes. Sorry about
that
Hi,
I'm getting a bus error with Network library on my Mac OS X 10.6.5.
I have ghc 6.12.3, network 2.3.
As an example:
main = withSocketsDo $
do sock - listenOn $ PortNumber 4244
(handle,host,port) - accept sock
hPutStr handle Hi!
sClose sock
I too would like such a tutorial.
There is a lot of good material explaining certain concepts, and
complete examples doing some real-world task. I've read RWH and LYAH
and browsed quite some sources from packages from hackage. I
understand what I read and I'm able to re-use that knowledge. But I
On 17 December 2010 00:59, Gregg Reynolds d...@mobileink.com wrote:
My real goal is to think about better
language for software build systems, since what we have now is pretty weak,
in my view.
I can't speak for your monad based approach, but you may be interested
in Neil Mitchell's Haskell
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