On Tue, Dec 13, 2011 at 2:23 PM, Shakthi Kannan wrote:

Hi,

I am trying to read a .cabal find and print the package name and version. Here is the code snippet:

=== Code ===

getName :: FilePath -> IO () getName cabal = do           gdesc <- readPackageDescription normal cabal           let desc = flattenPackageDescription gdesc               final = pkgName $ package desc           putStrLn final

=== END ===

=== Output ===

   Couldn't match expected type `[Char]'                with actual type `PackageName'

=== END ===

I see that the method 'package' from:

 http://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Distribution...

allows me to return the PackageIdentifier. Using pkgName returns a PackageName.

 http://www.haskell.org/cabal/release/cabal-latest/doc/API/Cabal/Distribution...

But, how can I obtain the string value from it?

Appreciate any help in this regard.

Thanks!

SK

-- Shakthi Kannan http://www.shakthimaan.com

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You need to use pattern patching, e.g.: let PackageName str = pkgName $ ... HTH, Michael