show-combinators: Combinators to write Show instances

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A minimal pretty-printing library for Show instances in Haskell.

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Dependencies base (>=4.8 && <5) [details]
License MIT
Copyright 2018 Li-yao Xia
Author Li-yao Xia
Revised Revision 2 made by lyxia at 2021-02-16T14:35:40Z
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Uploaded by lyxia at 2020-03-22T21:10:10Z
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Show combinators Hackage Build Status

A minimal set of convenient combinators to write Show instances.

data MyType a
  = C a a                   -- a regular constructor
  | a :+: a                 -- an infix constructor
  | R { f1 :: a, f2 :: a }  -- a record

infixl 4 :+:

instance Show a => Show (MyType a) where
  showsPrec = flip precShows where
    precShows (C a b) = showCon "C" @| a @| b
    precShows (c :+: d) = showInfix ":+:" 4 c d
    precShows (R {f1 = e, f2 = f}) =
      showRecord "R" ("f1" .=. e &| "f2" .=. f)