cabal-version: 3.0
name:          stock-hashable
version:       0.1.0.0
synopsis:      Derive Hashable via the stock plugin
description:
  The @stock@ plugin provides a datatype for deriving and synthesising
  instances at compile time. @stock-hashable@ extends the @stock@ with
  support for @Hashable@ and higher-kinded variants.

  > {-# options_ghc -fplugin Stock #-}
  > 
  > {-# language DerivingVia #-}
  > 
  > import Stock
  > import Stock.Hashable
  > 
  > data Pair a b = Pair a b
  >  deriving (Eq,  Hashable)  via Stock  (Pair a b)
  >  deriving (Eq1, Hashable1) via Stock1 (Pair a)
  >  deriving (Eq2, Hashable2) via Stock2 Pair

  @stock-hashable@ provides three instances, that signal to the plugin
  how to derive @Hashable@.

  > instance DeriveStock  Hashable  ..
  > instance DeriveStock1 Hashable1 ..
  > instance DeriveStock2 Hashable2 ..
license:      BSD-3-Clause
license-file: LICENSE
author:       Baldur Blöndal
maintainer:   baldur.blondal@iohk.io
category:     Type System
build-type:   Simple
tested-with:  GHC == 9.8.1
            , GHC == 9.10.3
            , GHC == 9.12.4
            , GHC == 9.14.1
library
  exposed-modules: Stock.Hashable
  build-depends: base >=4.18 && <5
               , ghc >=9.6 && <9.16
               , stock >=0.1 && <0.2
               , hashable >=1.4 && <1.6
  hs-source-dirs: .
  default-language: GHC2021
  ghc-options: -Wall

test-suite test
  type:             exitcode-stdio-1.0
  main-is:          Test.hs
  build-depends:    base, stock, stock-hashable, hashable
  ghc-options:      -fplugin=Stock
  hs-source-dirs:   test
  default-language: GHC2021

-- zero-cost proof: Stock wrapper is fully erased
test-suite inspection
  type:              exitcode-stdio-1.0
  main-is:           Inspection.hs
  build-depends:     base, stock, stock-hashable, hashable, inspection-testing
  ghc-options:       -fplugin=Stock
  hs-source-dirs:    inspection
  default-language:  GHC2021
  -- no inspection-testing support
  if impl(ghc >= 9.14)
    buildable: False

source-repository head
  type:     git
  location: https://github.com/Icelandjack/stock.git
  subdir:   hashable