[Haskell-cafe] MonadError vs Control.Exception
Hi, guys, I'm interested in best practices in using of each approach. Personally I like MonadError because it is more explicit and Control.Exception-s becomes really ugly in complex scenarios. Here an example to illustrate my idea: http://hackage.haskell.org/packages/archive/network-conduit/0.4.0/doc/html/src/Data-Conduit-Network.html#bindPort. All network-conduit functions can raise IOException because of Socket-related stuff (and actually entire network-conduit is written to deal with IOException correctry) + Bind-port can raise ErrorCall (came from error bindPort: addrs is empty). User has to deal with both, but have no evidence on none of them from type signatures or documentation. Moreover, ErrorCall in this case can be caused by IOException (we try to bind only available address, we get IOException exception, we have no more address to try and raise ErrorCall), and I really don’t understand, why it should be treated in a different way. So, I hate exceptions, I blame it, I think exceptions is junk came from OO-world and horrible languages like C# or even more horrible like Java, and it should be wiped out from Haskell with fire. But it is only my humble opinion. Reality shows that Haskell provides extensive support for exceptions, it included in base libraries and everyone uses it, but MonadError is modest part of mtl, and don’t even have “bracket” and other useful functions. That is why I’m really interested in any your ideas and experience on using these approaches. Cheers, Stasik. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] HJavaScript: representing build-in global function.
Hi Cafe! Does someone know how to represent js build-in global function (such as parseInt(), parseFloat(), eval()) with HJavaScript? Perhaps JConst: JCall (JConst parseInt) (JString 123)? -- Sincerely, Stanislav Chernichkin. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Building regex-posix for windows
I'm having trouble building regex-posix for Windows under MinGW because MinGW does not include regex.h. As far as I know Haskell Platform uses MinGW and it includes regex-posix. I'd like to build regex-posix by myself, like Haskell Platform does. I would appreciate it if someone suggests some resources about building regex-posix and other packages for windows. I’m also looking for Haskell Platform developer’s blog or something similar, where I can read about porting Haskell on Windows. Thanks. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: Happstack 0.4.1
I was unable to install happstack-data-0.4.1 on windows with GHC 6.12.1.
Here the log:
Resolving dependencies...
Configuring happstack-data-0.4.1...
Preprocessing library happstack-data-0.4.1...
Preprocessing executables for happstack-data-0.4.1...
Building happstack-data-0.4.1...
src\Happstack\Data\GOps.hs:54:0:
warning: no newline at end of file
src\Happstack\Data\SerializeTH.hs:88:0:
warning: no newline at end of file
[ 1 of 16] Compiling Happstack.Data.GOps ( src\Happstack\Data\GOps.hs,
dist\buil
d\Happstack\Data\GOps.o )
src\Happstack\Data\Serialize.hs:1:85:
Warning: -XPatternSignatures is deprecated: use
-XScopedTypeVariables or pra
gma {-# LANGUAGE ScopedTypeVariables #-} instead
src\Happstack\Data\Xml\Base.hs:6:13:
Warning: -XPatternSignatures is deprecated: use
-XScopedTypeVariables or pra
gma {-# LANGUAGE ScopedTypeVariables #-} instead
[ 2 of 16] Compiling Happstack.Data.Normalize (
src\Happstack\Data\Normalize.hs,
dist\build\Happstack\Data\Normalize.o )
[ 3 of 16] Compiling Happstack.Data.Migrate (
src\Happstack\Data\Migrate.hs, dis
t\build\Happstack\Data\Migrate.o )
[ 4 of 16] Compiling Happstack.Data.Default (
src\Happstack\Data\Default.hs, dis
t\build\Happstack\Data\Default.o )
[ 5 of 16] Compiling Happstack.Data.DeriveAll (
src\Happstack\Data\DeriveAll.hs,
dist\build\Happstack\Data\DeriveAll.o )
[ 6 of 16] Compiling Happstack.Data.Default.Generic (
src\Happstack\Data\Default
\Generic.hs, dist\build\Happstack\Data\Default\Generic.o )
[ 7 of 16] Compiling Happstack.Data.Xml.Base (
src\Happstack\Data\Xml\Base.hs, d
ist\build\Happstack\Data\Xml\Base.o )
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package array-0.3.0.0 ... linking ... done.
Loading package bytestring-0.9.1.5 ... linking ... done.
Loading package containers-0.3.0.0 ... linking ... done.
Loading package pretty-1.0.1.1 ... linking ... done.
Loading package template-haskell ... linking ... done.
Loading package syb-with-class-0.6.1 ... linking ... done.
Loading package HUnit-1.2.2.1 ... linking ... done.
Loading package syb-0.1.0.2 ... linking ... done.
Loading package base-3.0.3.2 ... linking ... done.
Loading package Win32-2.2.0.1 ... linking ... done.
Loading package old-locale-1.0.0.2 ... linking ... done.
Loading package time-1.1.4 ... linking ... done.
Loading package random-1.0.0.2 ... linking ... done.
Loading package QuickCheck-1.2.0.0 ... linking ... done.
Loading package extensible-exceptions-0.1.1.1 ... linking ... done.
Loading package mtl-1.1.0.2 ... linking ... done.
Loading package old-time-1.0.0.3 ... linking ... done.
Loading package parsec-2.1.0.1 ... linking ... done.
Loading package hsemail-1.3 ... linking ... done.
Loading package network-2.2.1.7 ... linking ... done.
Loading package SMTPClient-1.0.1 ... linking ... done.
Loading package filepath-1.1.0.3 ... linking ... done.
Loading package directory-1.0.1.0 ... linking ... done.
Loading package process-1.0.1.2 ... linking ... done.
Loading package hslogger-1.0.7 ... linking ... done.
Loading package deepseq-1.1.0.0 ... linking ... done.
Loading package parallel-2.2.0.1 ... linking ... done.
Loading package strict-concurrency-0.2.2 ... linking ... done.
Loading package unix-compat-0.1.2.1 ... linking ... done.
Loading package happstack-util-0.4.1 ... linking ... done.
Loading package binary-0.5.0.2 ... linking ... done.
Loading package haskell98 ... linking ... done.
Loading package HaXml-1.13.3 ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
ghc.exe: dist\build\Happstack\Data\Default.o: unknown symbol
`_sybzmwithzmclassz
m0zi6zi1_DataziGenericsziSYBziWithClassziInstances_constrZMacbsZN_closure'
cabal: Error: some packages failed to install:
happstack-data-0.4.1 failed during the building phase. The exception was:
ExitFailure 1
I can create more detailed log if you need.
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