Hi Alexey, On 2 May 2011 21:01, Alexey Khudyakov wrote:

My question is there any tool for reformatting result of show so it could be read by human beings?

http://hackage.haskell.org/package/pretty-show Just use ppShow, instead of show. Hope this helps, Ozgur

On Mon, May 2, 2011 at 3:01 PM, Alexey Khudyakov wrote:

Hello everyone!

Haskell have nice automatically derivable Show type class. It's quite useful for debugging with one exception. String representation of even moderately large value is completely unreadable (example below).

My question is there any tool for reformatting result of show so it could be read by human beings?

You could use the 'groom' package on Hackage: http://hackage.haskell.org/package/groom It works best for the derived show instances. Antoine

Real life example of world salad produced by show

...

Module (SrcLoc {srcFilename = "rec.hs", srcLine = 1, srcColumn = 1}) (ModuleName "Main") [OptionsPragma (SrcLoc {srcFilename = "rec.hs", srcLine = 1, srcColumn = 1}) (Just GHC) "-F -pgmF ./preprocessor "] Nothing (Just [EVar (UnQual (Ident "main"))]) [] [DataDecl (SrcLoc {srcFilename = "rec.hs", srcLine = 3, srcColumn = 1}) DataType [] (Ident "Foo") [] [QualConDecl (SrcLoc {srcFilename = "rec.hs", srcLine = 3, srcColumn = 12}) [] [] (RecDecl (Ident "Foo") [([Ident "asd"],UnBangedTy (TyCon (UnQual (Ident "Int")))),([Ident "fgh"],UnBangedTy (TyCon (UnQual (Ident "String"))))])] [(UnQual ...

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