[Haskell-cafe] making the GHC Api not write to stderr
I was wondering how to forcibly quiet down the API. I have a custom handler
in place, but when I call the function on failure both my handler gets
called and somewhere somehow errors get printed to the stderr, which I
really need to avoid.
My current code looks like
getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
getModInfo qual file path = handleSourceError processErrors $
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
setSessionDynFlags $ configureDynFlags dflags
target <- guessTarget file Nothing
addTarget target
setSessionDynFlags $ dflags { importPaths = [path] }
load LoadAllTargets
graph <- depanal [] False
let modifier = moduleName . ms_mod
modName = modifier $ head graph
includes = includePaths dflags
imports = importPaths dflags
dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags
setSessionDynFlags $ dflags' { includePaths = path:includes
, importPaths = path:imports
}
parsed <- parse modName
checked <- typecheckModule parsed
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Re: [Haskell-cafe] making the GHC Api not write to stderr
hi,
i tried this too, but i did not get it. a very nice workaround is to use
hint [1].
have fun
martin
[1]: http://hackage.haskell.org/package/hint
On 20.05.2010 20:05, Phyx wrote:
I was wondering how to forcibly quiet down the API. I have a custom
handler in place, but when I call the function on failure both my
handler gets called and somewhere somehow errors get printed to the
stderr, which I really need to avoid.
My current code looks like
getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
getModInfo qual file path = handleSourceError processErrors $
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
setSessionDynFlags $ configureDynFlags dflags
target <- guessTarget file Nothing
addTarget target
setSessionDynFlags $ dflags { importPaths = [path] }
load LoadAllTargets
graph <- depanal [] False
let modifier = moduleName . ms_mod
modName = modifier $ head graph
includes = includePaths dflags
imports = importPaths dflags
dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags
setSessionDynFlags $ dflags' { includePaths = path:includes
, importPaths = path:imports
}
parsed <- parse modName
checked <- typecheckModule parsed
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RE: [Haskell-cafe] making the GHC Api not write to stderr
I've thought about that, but my specific problem is that I'm calling the
Haskell code compiled to a shared lib and then hPutStr is failing,
presumable because there is no valid stderr (and I would image also no stdin
or out).
So in order for me to use that method I would have to create a new file
handle and direct stderr to that. Or somehow create a fake Handle and pass
it that.
Or another alternative is on the side where I call the lib, create and
attach some hidden console to the process and have it write there.
But that all seems like a hackish way out, It would be best if the API just
allowed me to turn off this behavior of writing to stderr.
From: Jean-Denis Koeck [mailto:jdko...@gmail.com]
Sent: Thursday, May 20, 2010 21:59
To: Phyx
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
Maybe this
<http://nominolo.blogspot.com/2010/04/haskell-tip-redirect-stdout-in-haskell
.html> could help you ?
2010/5/20 Phyx
I was wondering how to forcibly quiet down the API. I have a custom handler
in place, but when I call the function on failure both my handler gets
called and somewhere somehow errors get printed to the stderr, which I
really need to avoid.
My current code looks like
getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
getModInfo qual file path = handleSourceError processErrors $
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
setSessionDynFlags $ configureDynFlags dflags
target <- guessTarget file Nothing
addTarget target
setSessionDynFlags $ dflags { importPaths = [path] }
load LoadAllTargets
graph <- depanal [] False
let modifier = moduleName . ms_mod
modName = modifier $ head graph
includes = includePaths dflags
imports = importPaths dflags
dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags
setSessionDynFlags $ dflags' { includePaths = path:includes
, importPaths = path:imports
}
parsed <- parse modName
checked <- typecheckModule parsed
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RE: [Haskell-cafe] making the GHC Api not write to stderr
Hi,
Unfortunately hint does not provide the functionality I require, and from
what I remember about hint they also use the GHC API, I guess the problem
here is the defaultErrorhandlers that is in initGhcMonad . I've been
wondering if I give my own implementation, one that doesn't do any printing
at all and reimplement initGhcMonad I can maybe get the desired result but
I'm not sure
-Original Message-
From: haskell-cafe-boun...@haskell.org
[mailto:haskell-cafe-boun...@haskell.org] On Behalf Of Martin Hilbig
Sent: Thursday, May 20, 2010 21:45
To: haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
hi,
i tried this too, but i did not get it. a very nice workaround is to use
hint [1].
have fun
martin
[1]: http://hackage.haskell.org/package/hint
On 20.05.2010 20:05, Phyx wrote:
> I was wondering how to forcibly quiet down the API. I have a custom
> handler in place, but when I call the function on failure both my
> handler gets called and somewhere somehow errors get printed to the
> stderr, which I really need to avoid.
>
> My current code looks like
>
> getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
>
> getModInfo qual file path = handleSourceError processErrors $
>
> runGhc (Just libdir) $ do
>
> dflags <- getSessionDynFlags
>
> setSessionDynFlags $ configureDynFlags dflags
>
> target <- guessTarget file Nothing
>
> addTarget target
>
> setSessionDynFlags $ dflags { importPaths = [path] }
>
> load LoadAllTargets
>
> graph <- depanal [] False
>
> let modifier = moduleName . ms_mod
>
> modName = modifier $ head graph
>
> includes = includePaths dflags
>
> imports = importPaths dflags
>
> dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags
>
> setSessionDynFlags $ dflags' { includePaths = path:includes
>
> , importPaths = path:imports
>
> }
>
> parsed <- parse modName
>
> checked <- typecheckModule parsed
>
>
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
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Re: [Haskell-cafe] making the GHC Api not write to stderr
You could try changing the log_action[1] member of the DynFlags. A
while ago I turned most printed errors into some form of error
message, but I wouldn't be surprised if I missed some places. All
output should go through log_action, though, so try changing that to
intercept any output.
[1]:
http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.html#v%3Alog_action
On 20 May 2010 19:05, Phyx wrote:
> I was wondering how to forcibly quiet down the API. I have a custom handler
> in place, but when I call the function on failure both my handler gets
> called and somewhere somehow errors get printed to the stderr, which I
> really need to avoid.
>
>
>
> My current code looks like
>
>
>
> getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
>
> getModInfo qual file path = handleSourceError processErrors $
>
> runGhc (Just libdir) $ do
>
> dflags <- getSessionDynFlags
>
> setSessionDynFlags $ configureDynFlags dflags
>
> target <- guessTarget file Nothing
>
> addTarget target
>
> setSessionDynFlags $ dflags { importPaths = [path] }
>
> load LoadAllTargets
>
> graph <- depanal [] False
>
> let modifier = moduleName . ms_mod
>
> modName = modifier $ head graph
>
> includes = includePaths dflags
>
> imports = importPaths dflags
>
>
>
> dflags' <- Debug.trace (moduleNameString modName) getSessionDynFlags
>
> setSessionDynFlags $ dflags' { includePaths = path:includes
>
> , importPaths = path:imports
>
> }
>
>
>
> parsed <- parse modName
>
> checked <- typecheckModule parsed
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
--
Push the envelope. Watch it bend.
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RE: [Haskell-cafe] making the GHC Api not write to stderr
Hi,
I tried that, setting it to (\_ _ _ _ -> return ()) and it still did the
same, also tried setting it to undefined to see whether the code that's
printing the error is using it, and it didn't crash
So I assume it's not.
---
*VsxParser> getModInfo True
"C:\\Users\\Phyx\\AppData\\Local\\Temp\\tmp5600.hs"
"" >> return ()
C:\Users\Phyx\AppData\Local\Temp\tmp5600.hs:11:13:
parse error on input `='
Printf
-
I think parseModule might still have a hardcoded print statement in it.
-Original Message-
From: Thomas Schilling [mailto:nomin...@googlemail.com]
Sent: Friday, May 21, 2010 12:53
To: Phyx
Cc: haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
You could try changing the log_action[1] member of the DynFlags. A while
ago I turned most printed errors into some form of error message, but I
wouldn't be surprised if I missed some places. All output should go through
log_action, though, so try changing that to intercept any output.
[1]:
http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h
tml#v%3Alog_action
On 20 May 2010 19:05, Phyx wrote:
> I was wondering how to forcibly quiet down the API. I have a custom
> handler in place, but when I call the function on failure both my
> handler gets called and somewhere somehow errors get printed to the
> stderr, which I really need to avoid.
>
>
>
> My current code looks like
>
>
>
> getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
>
> getModInfo qual file path = handleSourceError processErrors $
>
> runGhc (Just libdir) $ do
>
> dflags <- getSessionDynFlags
>
> setSessionDynFlags $ configureDynFlags dflags
>
> target <- guessTarget file Nothing
>
> addTarget target
>
> setSessionDynFlags $ dflags { importPaths = [path] }
>
> load LoadAllTargets
>
> graph <- depanal [] False
>
> let modifier = moduleName . ms_mod
>
> modName = modifier $ head graph
>
> includes = includePaths dflags
>
> imports = importPaths dflags
>
>
>
> dflags' <- Debug.trace (moduleNameString modName)
> getSessionDynFlags
>
> setSessionDynFlags $ dflags' { includePaths = path:includes
>
> , importPaths = path:imports
>
> }
>
>
>
> parsed <- parse modName
>
> checked <- typecheckModule parsed
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
--
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Re: [Haskell-cafe] making the GHC Api not write to stderr
Have you tried freopen on stderr?
On Fri, May 21, 2010 at 8:43 AM, Phyx wrote:
> Hi,
> I tried that, setting it to (\_ _ _ _ -> return ()) and it still did the
> same, also tried setting it to undefined to see whether the code that's
> printing the error is using it, and it didn't crash
> So I assume it's not.
>
> ---
> *VsxParser> getModInfo True
> "C:\\Users\\Phyx\\AppData\\Local\\Temp\\tmp5600.hs"
> "" >> return ()
>
> C:\Users\Phyx\AppData\Local\Temp\tmp5600.hs:11:13:
>parse error on input `='
> Printf
> -
>
> I think parseModule might still have a hardcoded print statement in it.
>
> -Original Message-
> From: Thomas Schilling [mailto:nomin...@googlemail.com]
> Sent: Friday, May 21, 2010 12:53
> To: Phyx
> Cc: haskell-cafe@haskell.org
> Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
>
> You could try changing the log_action[1] member of the DynFlags. A while
> ago I turned most printed errors into some form of error message, but I
> wouldn't be surprised if I missed some places. All output should go
> through
> log_action, though, so try changing that to intercept any output.
>
> [1]:
>
> http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h
> tml#v%3Alog_action
>
> On 20 May 2010 19:05, Phyx wrote:
> > I was wondering how to forcibly quiet down the API. I have a custom
> > handler in place, but when I call the function on failure both my
> > handler gets called and somewhere somehow errors get printed to the
> > stderr, which I really need to avoid.
> >
> >
> >
> > My current code looks like
> >
> >
> >
> > getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
> >
> > getModInfo qual file path = handleSourceError processErrors $
> >
> > runGhc (Just libdir) $ do
> >
> > dflags <- getSessionDynFlags
> >
> > setSessionDynFlags $ configureDynFlags dflags
> >
> > target <- guessTarget file Nothing
> >
> > addTarget target
> >
> > setSessionDynFlags $ dflags { importPaths = [path] }
> >
> > load LoadAllTargets
> >
> > graph <- depanal [] False
> >
> > let modifier = moduleName . ms_mod
> >
> > modName = modifier $ head graph
> >
> > includes = includePaths dflags
> >
> > imports = importPaths dflags
> >
> >
> >
> > dflags' <- Debug.trace (moduleNameString modName)
> > getSessionDynFlags
> >
> > setSessionDynFlags $ dflags' { includePaths = path:includes
> >
> > , importPaths = path:imports
> >
> > }
> >
> >
> >
> > parsed <- parse modName
> >
> > checked <- typecheckModule parsed
> >
> > ___
> > Haskell-Cafe mailing list
> > Haskell-Cafe@haskell.org
> > http://www.haskell.org/mailman/listinfo/haskell-cafe
> >
> >
>
>
>
> --
> Push the envelope. Watch it bend.
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
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RE: [Haskell-cafe] making the GHC Api not write to stderr
I did some more digging around and it would seem that the error was being
printed from the load call (depanal does some parsing ofcourse to find the
imports).
I managed to silence that using loadWithLogger (const $ return ())
LoadAllTargets (maybe all these loggers should be consolidated).
That stopped it from showing part of the error, but can’t figure out what’s
showing the module name at the end. “Printf”
From: Daniel Peebles [mailto:pumpkin...@gmail.com]
Sent: Saturday, May 22, 2010 03:02
To: Phyx
Cc: Thomas Schilling; haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
Have you tried freopen on stderr?
On Fri, May 21, 2010 at 8:43 AM, Phyx wrote:
Hi,
I tried that, setting it to (\_ _ _ _ -> return ()) and it still did the
same, also tried setting it to undefined to see whether the code that's
printing the error is using it, and it didn't crash
So I assume it's not.
---
*VsxParser> getModInfo True
"C:\\Users\\Phyx\\AppData\\Local\\Temp\\tmp5600.hs"
"" >> return ()
C:\Users\Phyx\AppData\Local\Temp\tmp5600.hs:11:13:
parse error on input `='
Printf
-
I think parseModule might still have a hardcoded print statement in it.
-Original Message-
From: Thomas Schilling [mailto:nomin...@googlemail.com]
Sent: Friday, May 21, 2010 12:53
To: Phyx
Cc: haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
You could try changing the log_action[1] member of the DynFlags. A while
ago I turned most printed errors into some form of error message, but I
wouldn't be surprised if I missed some places. All output should go through
log_action, though, so try changing that to intercept any output.
[1]:
http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h
<http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h%0d%0atml#v%3Alog_action>
tml#v%3Alog_action
On 20 May 2010 19:05, Phyx wrote:
> I was wondering how to forcibly quiet down the API. I have a custom
> handler in place, but when I call the function on failure both my
> handler gets called and somewhere somehow errors get printed to the
> stderr, which I really need to avoid.
>
>
>
> My current code looks like
>
>
>
> getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
>
> getModInfo qual file path = handleSourceError processErrors $
>
> runGhc (Just libdir) $ do
>
> dflags <- getSessionDynFlags
>
> setSessionDynFlags $ configureDynFlags dflags
>
> target <- guessTarget file Nothing
>
> addTarget target
>
> setSessionDynFlags $ dflags { importPaths = [path] }
>
> load LoadAllTargets
>
> graph <- depanal [] False
>
> let modifier = moduleName . ms_mod
>
> modName = modifier $ head graph
>
> includes = includePaths dflags
>
> imports = importPaths dflags
>
>
>
> dflags' <- Debug.trace (moduleNameString modName)
> getSessionDynFlags
>
> setSessionDynFlags $ dflags' { includePaths = path:includes
>
> , importPaths = path:imports
>
> }
>
>
>
> parsed <- parse modName
>
> checked <- typecheckModule parsed
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
--
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RE: [Haskell-cafe] making the GHC Api not write to stderr
Right, that modulename was being printed due to a trace statement in my code,
so I’m now using withLocalCallbacks (\_ -> GhcApiCallbacks (\_ _ -> return ()))
$
To override everything along with setting log_action to (\_ _ _ _ -> return
()). Now nothing else gets printed J
Thanks for all the help,
Phyx
> I did some more digging around and it would seem that the error was being
> printed from the load call (depanal does some parsing ofcourse to find the
> imports).
>I managed to silence that using loadWithLogger (const $ return ())
>LoadAllTargets (maybe all these loggers should be consolidated).
> That stopped it from showing part of the error, but can’t figure out what’s
> showing the module name at the end. “Printf”
From: Daniel Peebles [mailto:pumpkin...@gmail.com]
Sent: Saturday, May 22, 2010 03:02
To: Phyx
Cc: Thomas Schilling; haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
Have you tried freopen on stderr?
On Fri, May 21, 2010 at 8:43 AM, Phyx wrote:
Hi,
I tried that, setting it to (\_ _ _ _ -> return ()) and it still did the
same, also tried setting it to undefined to see whether the code that's
printing the error is using it, and it didn't crash
So I assume it's not.
---
*VsxParser> getModInfo True
"C:\\Users\\Phyx\\AppData\\Local\\Temp\\tmp5600.hs"
"" >> return ()
C:\Users\Phyx\AppData\Local\Temp\tmp5600.hs:11:13:
parse error on input `='
Printf
-
I think parseModule might still have a hardcoded print statement in it.
-Original Message-
From: Thomas Schilling [mailto:nomin...@googlemail.com]
Sent: Friday, May 21, 2010 12:53
To: Phyx
Cc: haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] making the GHC Api not write to stderr
You could try changing the log_action[1] member of the DynFlags. A while
ago I turned most printed errors into some form of error message, but I
wouldn't be surprised if I missed some places. All output should go through
log_action, though, so try changing that to intercept any output.
[1]:
http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h
<http://haskell.org/ghc/docs/6.12-latest/html/libraries/ghc-6.12.2/DynFlags.h%0d%0atml#v%3Alog_action>
tml#v%3Alog_action
On 20 May 2010 19:05, Phyx wrote:
> I was wondering how to forcibly quiet down the API. I have a custom
> handler in place, but when I call the function on failure both my
> handler gets called and somewhere somehow errors get printed to the
> stderr, which I really need to avoid.
>
>
>
> My current code looks like
>
>
>
> getModInfo :: Bool -> String -> String -> IO (ApiResults ModuleInfo)
>
> getModInfo qual file path = handleSourceError processErrors $
>
> runGhc (Just libdir) $ do
>
> dflags <- getSessionDynFlags
>
> setSessionDynFlags $ configureDynFlags dflags
>
> target <- guessTarget file Nothing
>
> addTarget target
>
> setSessionDynFlags $ dflags { importPaths = [path] }
>
> load LoadAllTargets
>
> graph <- depanal [] False
>
> let modifier = moduleName . ms_mod
>
> modName = modifier $ head graph
>
> includes = includePaths dflags
>
> imports = importPaths dflags
>
>
>
> dflags' <- Debug.trace (moduleNameString modName)
> getSessionDynFlags
>
> setSessionDynFlags $ dflags' { includePaths = path:includes
>
> , importPaths = path:imports
>
> }
>
>
>
> parsed <- parse modName
>
> checked <- typecheckModule parsed
>
> ___
> Haskell-Cafe mailing list
> Haskell-Cafe@haskell.org
> http://www.haskell.org/mailman/listinfo/haskell-cafe
>
>
--
Push the envelope. Watch it bend.
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