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groom: Pretty printing for well-behaved Show instances.

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Automatically derived Show instances are an easy way to inspect data in your program. However, for large data-structures, the resulting output lacks whitespace, making it unreadable. Groom offers an replacement to show called groom which attempts to pretty-print the output of show. For example:

let x = parseExp "foobar 1 [1,2]"
in do
  putStrLn (show x)
  putStrLn (groom x)

results in:

ParseOk (App (App (Var (UnQual (Ident "foobar"))) (Lit (Int 1))) (List [Lit (Int 1),Lit (Int 2)]))
ParseOk
  (App (App (Var (UnQual (Ident "foobar"))) (Lit (Int 1)))
     (List [Lit (Int 1), Lit (Int 2)]))

Groom works only on Show instances that output valid Haskell code; if Groom can't understand its input, it will not make any changes.

Properties

Versions 0.1, 0.1.1, 0.1.2, 0.1.2.1, 0.1.2.1
Change log None available
Dependencies base (>=3 && <5), groom, haskell-src-exts (>=1.0.0) [details]
License BSD-3-Clause
Author Edward Z. Yang
Maintainer ezyang@mit.edu
Category Text
Uploaded by EdwardYang at 2017-04-19T02:28:40Z

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