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