Hi all,
I am in the process of writing a Haskell program consisting of two
threads, one for performing a calculation and one for an Ncurses UI
(haskell-ncurses).
The calculation thread needs to feed a stream of numbers back to the
UI thread (about 1 value per second) and the UI needs to take
Do you need advice on what? I didn't understand your last phrase.
Em 26/01/2013 06:25, Erik de Castro Lopo mle...@mega-nerd.com escreveu:
Hi all,
I am in the process of writing a Haskell program consisting of two
threads, one for performing a calculation and one for an Ncurses UI
wren ng thornton w...@freegeek.org wrote:
Yes. There is no reason to put up a second Hackage for that one.
Without changing anything in the current system, packages can just
update their categories, so that they will be displayed below
Defunct or something like that. This is fine, as
On Sat, Jan 26, 2013 at 07:46:04AM -0200, Thiago Negri wrote:
Do you need advice on what? I didn't understand your last phrase.
IIUC, it has to do which how to interrupt a blocking call to ncurses event
handling, from another thread (the calculation thread) to let the UI thread
refresh the UI
Thiago Negri wrote:
Do you need advice on what? I didn't understand your last phrase.
Well I have data from two sources, stdin and the calculation
thread. If I was doing this in C, I'd probably use a pipe for the
calculation data and then do select on the two file descriptors.
There is a
Erik de Castro Lopo mle...@mega-nerd.com wrote:
Do you need advice on what? I didn't understand your last phrase.
Well I have data from two sources, stdin and the calculation
thread. If I was doing this in C, I'd probably use a pipe for the
calculation data and then do select on the two
Hi Erik,
there seem to be several options. Tie simplest one is that you'll call
getEvent with some reasonable timeout in a loop and check some
communication channel an update from the calculation thread.
Probably the correct way how to handle it involves three threads:
(1) The computation
ghc doesn't seem to be unifying deriveJSON (String-String)
parameter with id :: a - a.
examples/TemplateHaskell.hs:22:14:
Couldn't match expected type `Data.Aeson.TH.Options'
with actual type `a0 - a0'
In the first argument of `deriveJSON', namely `id'
In the
On 26 January 2013 14:47, j...@stuttard.org wrote:
ghc doesn't seem to be unifying deriveJSON (String-String)
parameter with id :: a - a.
It seems you're using aeson HEAD. Note that the deriveJSON from the
released aeson-0.6.1.0 as the type:
deriveJSON :: (String - String) - Name - Q [Dec]
On 26 January 2013 15:20, Bas van Dijk v.dijk@gmail.com wrote:
But in aeson-HEAD it has the following type:
deriveJSON :: Options - Name - Q [Dec]
Note that I'm currently working on extending the encoding Options record:
* I added a constructorNameModifier :: String - String which is
Quoting Bas van Dijk v.dijk@gmail.com:
On 26 January 2013 14:47, j...@stuttard.org wrote:
ghc doesn't seem to be unifying deriveJSON (String-String)
parameter with id :: a - a.
It seems you're using aeson HEAD. Note that the deriveJSON from the
released aeson-0.6.1.0 as the type:
Quoting Bas van Dijk v.dijk@gmail.com:
On 26 January 2013 15:20, Bas van Dijk v.dijk@gmail.com wrote:
But in aeson-HEAD it has the following type:
deriveJSON :: Options - Name - Q [Dec]
Note that I'm currently working on extending the encoding Options record:
* I added a
On Sat, Jan 26, 2013 at 5:51 AM, Petr P petr@gmail.com wrote:
However, I'm not sure if Ncurses doesn't mind calling getEvent from a
different thread than the one that updates UI.
I don't know if the Haskell bindings change this, but at the C level as
long as automatic echo to a window is
Hello Haskellers,
What is the typical way to write out configuration files for use by the
configurator library? From asking around, seems like the library does not
(obviously) support writing out config files to disc from scratch. What I
want to do is write out a default config file to disc, or
Very nice to see, I'm happy to stand corrected here. We'll definitely get
some support for fixed into the next major release.
On Saturday, January 26, 2013, wrote:
According to the documentation, SQLite stores whatever you give it,
paying very little heed to the declared type. If you get
I'm trying SDL on Windows, and things are getting really weird.
I can compile the code (links on the end).
When I run it, if I try using `stdin` the program crashes with this
message:
stdin: hGetLine: invalid argument (Bad file descriptor)
Is it something to do with SDL itself?
What am I doing
Hi Ozgur,
I'm missing some context here, but I'll release an updated version of
hspec ASAP ;)
Cheers,
Simon
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Dear Haskellers,
I read some stuff about attribute grammars recently [1] and how UUAGC [2]
can be used for code generation. I felt like this should be possible inside
Haskell too so I did some experiments and I realized that indeed
catamorphisms can be represented in such a way that they can be
Herbert Valerio actually pointed out to me in PVT that funnily enough
I've actually *forgotten* and *rediscovered* this idiom! =)
http://www.haskell.org/pipermail/libraries/2011-November/017257.html
Cheers!
On Sat, Jan 26, 2013 at 5:43 PM, Felipe Almeida Lessa
felipe.le...@gmail.com wrote:
On Sat, 26 Jan 2013 21:52:03 +0100, Brandon Allbery allber...@gmail.com
wrote:
On Sat, Jan 26, 2013 at 3:34 PM, Thiago Negri evoh...@gmail.com wrote:
I'm trying SDL on Windows, and things are getting really weird.
I can compile the code (links on the end).
When I run it, if I try using
* Petr P petr@gmail.com [2013-01-26 23:03:51+0100]
Dear Haskellers,
I read some stuff about attribute grammars recently [1] and how UUAGC [2]
can be used for code generation. I felt like this should be possible inside
Haskell too so I did some experiments and I realized that indeed
I didn't use `-optl-mwindows`. I guess the dependency on SDL is doing this.
Anyway, I was trying to print some debug messages to see what was going
wrong.
Replaces the debugs message with on-screen messages using `SDL-ttf` package.
Thanks,
Thiago.
2013/1/26 Henk-Jan van Tuyl hjgt...@chello.nl
Felipe Almeida Lessa felipe.le...@gmail.com writes:
A few days ago I decided to hoogle the type of whenJust [2] and what I
discovered is that
import Data.Foldable (forM_)
whenJust = forM_
You can also use for_, if you want to use Applicative instead of Monad.
--
John Wiegley
FP
Sat, Jan 26, 2013 at 12:21:02PM +0600, s9gf4...@gmail.com wrote
According to the documentation, SQLite stores whatever you give it,
paying very little heed to the declared type. If you get SQLite to
*compare* two numbers, it will at that point *convert* them to doubles
in order to carry
Hi Petr,
Congratulations -- you've just implemented a Moore machine! [1]
I posted something very much like this just last year [2]. It's a very
common pattern in Haskell, forming the basis of coroutines and
iteratees and many other things.
Edward Kmett includes it in his machines package [3].
Hi Chris,
While the two things solve similar problems and have other similarities,
they are still quite different.
It's hard to call Petr's type a machine — there's no dynamics in it. It's
just a pair of an f-algebra and finalizer. Values of your type return
themselves — it is exactly this
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