Re: [Haskell-cafe] How to #include into .lhs files?

2011-02-04 Thread Max Bolingbroke 
On 4 February 2011 05:03, Michael Snoyman mich...@snoyman.com wrote:
 My guess (a complete guess) is that the deliterate step is creating a
 temporary .hs file elsewhere on your filesystem, which is why the CPP
 step can't find B.hs without a fully-qualified path.

That is what is happening (you can confirm with ghc -v).

Interestingly, you can work around by compiling with -I. on the command line:

{{{

mbolingbroke@equinox ~/Junk/lhscpp
$ cat Test.lhs Included.h
 {-# LANGUAGE CPP #-}
 module Main (main) where

#include MachDeps.h
#include Included.h

 main :: IO ()
 main = print MY_CONSTANT
#define MY_CONSTANT 2
mbolingbroke@equinox ~/Junk/lhscpp
$ ./Test
2
}}}

Perhaps worth filing a bug report?

Cheers
Max

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Re: [Haskell-cafe] How to #include into .lhs files?

2011-02-03 Thread Daniel Fischer 
On Thursday 03 February 2011 10:33:23, Conal Elliott wrote:
 Does anyone have a working example of #include'ing Haskell code into a
 bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
 errors. Is there documentation about how it's supposed to work?

 Help much appreciated.   - Conal

Stupid example:

-- Main:

 {-# LANGUAGE CPP #-}
 module Main (main) where

#include MachDeps.h

 main :: IO ()
 main = do

#if WORD_SIZE_IN_BITS == 32

 putStrLn 32 bits

#include Stuff32

# else

 putStrLn 64 bits

#include Stuff64
#endif

-- Stuff32:

  putStrLn Included from Stuff32

-- Stuff64:

  putStrLn Included from Stuff64


It's a bit tricky. Since the C preprocessor is run after the unlit, the 
included code should not have bird-tracks, also you have to get the 
indentation right. There's probably a way to run cpp before unlit, which 
would allow you to have bird-tracks in the #include'd code.

Much easier with LaTeX-style literate code.

Cheers,
Daniel

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Re: [Haskell-cafe] How to #include into .lhs files?

2011-02-03 Thread Conal Elliott 
Thanks, Daniel. I'm still stumped. When I say

#include B.hs

in a .hs file, all works fine, but when in a .lhs file I get error: B.hs:
No such file or directory. The file B.hs is in the same directory as the
including file, which is the current directory for ghci. Same situation with
ghc.

If I change B.hs to ./B.hs, I get the same behavior. Only if I use a
fully qualified path name for B.hs does it get found from the .lhs file.

I'm using GHC 6.12.3 on Mac OS 10.6.6.

Any ideas? (Anyone, not just Daniel.)

Thanks,  - Conal


On Thu, Feb 3, 2011 at 2:51 AM, Daniel Fischer 
daniel.is.fisc...@googlemail.com wrote:

 On Thursday 03 February 2011 10:33:23, Conal Elliott wrote:
  Does anyone have a working example of #include'ing Haskell code into a
  bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
  errors. Is there documentation about how it's supposed to work?
 
  Help much appreciated.   - Conal

 Stupid example:

 -- Main:

  {-# LANGUAGE CPP #-}
  module Main (main) where

 #include MachDeps.h

  main :: IO ()
  main = do

 #if WORD_SIZE_IN_BITS == 32

  putStrLn 32 bits

 #include Stuff32

 # else

  putStrLn 64 bits

 #include Stuff64
 #endif

 -- Stuff32:

  putStrLn Included from Stuff32

 -- Stuff64:

  putStrLn Included from Stuff64


 It's a bit tricky. Since the C preprocessor is run after the unlit, the
 included code should not have bird-tracks, also you have to get the
 indentation right. There's probably a way to run cpp before unlit, which
 would allow you to have bird-tracks in the #include'd code.

 Much easier with LaTeX-style literate code.

 Cheers,
 Daniel

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Re: [Haskell-cafe] How to #include into .lhs files?

2011-02-03 Thread Michael Snoyman 
My guess (a complete guess) is that the deliterate step is creating a
temporary .hs file elsewhere on your filesystem, which is why the CPP
step can't find B.hs without a fully-qualified path.

Michael

On Fri, Feb 4, 2011 at 6:56 AM, Conal Elliott co...@conal.net wrote:
 Thanks, Daniel. I'm still stumped. When I say

 #include B.hs

 in a .hs file, all works fine, but when in a .lhs file I get error: B.hs:
 No such file or directory. The file B.hs is in the same directory as the
 including file, which is the current directory for ghci. Same situation with
 ghc.

 If I change B.hs to ./B.hs, I get the same behavior. Only if I use a
 fully qualified path name for B.hs does it get found from the .lhs file.

 I'm using GHC 6.12.3 on Mac OS 10.6.6.

 Any ideas? (Anyone, not just Daniel.)

 Thanks,  - Conal


 On Thu, Feb 3, 2011 at 2:51 AM, Daniel Fischer
 daniel.is.fisc...@googlemail.com wrote:

 On Thursday 03 February 2011 10:33:23, Conal Elliott wrote:
  Does anyone have a working example of #include'ing Haskell code into a
  bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
  errors. Is there documentation about how it's supposed to work?
 
  Help much appreciated.   - Conal

 Stupid example:

 -- Main:

  {-# LANGUAGE CPP #-}
  module Main (main) where

 #include MachDeps.h

  main :: IO ()
  main = do

 #if WORD_SIZE_IN_BITS == 32

      putStrLn 32 bits

 #include Stuff32

 # else

      putStrLn 64 bits

 #include Stuff64
 #endif

 -- Stuff32:

      putStrLn Included from Stuff32

 -- Stuff64:

      putStrLn Included from Stuff64


 It's a bit tricky. Since the C preprocessor is run after the unlit, the
 included code should not have bird-tracks, also you have to get the
 indentation right. There's probably a way to run cpp before unlit, which
 would allow you to have bird-tracks in the #include'd code.

 Much easier with LaTeX-style literate code.

 Cheers,
 Daniel


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