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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Versions [faq] 0.1.0.0, 0.1.1.0, 0.2.0.0
Change log CHANGELOG.md
Dependencies base (>=4.8 && <4.15) [details]
License MIT
Copyright 2018 Li-yao Xia
Author Li-yao Xia
Maintainer lysxia@gmail.com
Revised Revision 1 made by lyxia at 2020-04-14T19:58:59Z
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Home page https://github.com/Lysxia/show-combinators#readme
Source repo head: git clone https://github.com/Lysxia/show-combinators
Uploaded by lyxia at 2020-03-22T21:10:10Z
Distributions Arch:0.2.0.0, LTSHaskell:0.1.1.0, NixOS:0.2.0.0, Stackage:0.1.1.0
Downloads 3411 total (399 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2020-03-22 [all 1 reports]

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Readme for show-combinators-0.2.0.0

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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)