Add Haskell package

.gitignore

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 result
 result-*
+
+dist/
+dist-newstyle/

CHANGELOG.md

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+# Revision history for arion-compose
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

arion-compose.cabal

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+cabal-version:       2.2
+
+name:                arion-compose
+version:             0.1.0.0
+synopsis:            Run docker-compose with help from Nix/NixOS
+-- description:
+homepage:            https://github.com/hercules-ci/arion#readme
+-- bug-reports:
+license:             Apache-2.0
+license-file:        LICENSE
+author:              Robert Hensing
+maintainer:          robert@hercules-ci.com
+-- copyright:
+-- category:
+extra-source-files:  CHANGELOG.md, README.asciidoc
+write-ghc-enviroment-files:
+                     never
+
+common deps
+  build-depends:     base ^>=4.12.0.0
+                   , aeson
+                   , protolude
+
+
+library
+  import:              deps
+  -- exposed-modules:
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       process
+  hs-source-dirs:      src/haskell/lib
+  default-language:    Haskell2010
+
+executable arion
+  import:              deps
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       optparse-applicative
+                     , process
+  hs-source-dirs:      src/haskell/exe
+  default-language:    Haskell2010
+
+test-suite arion-unit-tests
+  import:              deps
+  type:                exitcode-stdio-1.0
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       arion-compose
+                     , hspec
+                     , QuickCheck
+  hs-source-dirs:      src/haskell/test
+  default-language:    Haskell2010

live-unit-tests

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+#!/usr/bin/env nix-shell
+#!nix-shell ./shell.nix
+#!nix-shell -i bash
+set -eux -o pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+ghcid \
+  --command 'ghci -isrc/haskell/exe -isrc/haskell/lib -isrc/haskell/test src/haskell/test/TestMain.hs' \
+  --test=Main.main \
+  --restart=hercules-ci-api.cabal \
+  --restart=../stack.yaml \
+  ;

nix/haskell-overlay.nix

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+self: super: hself: hsuper: {
+  arion-compose = hself.callCabal2nix "arion-compose" ./.. {};
+}

nix/overlay.nix

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-self: super: {
+self: super:
+let
+  inherit (self.arion-project) haskellPkgs;
+in
+{
   arion = super.callPackage ../arion.nix {};
   tests = super.callPackage ../tests {};
   doc = super.callPackage ../doc {};
+
+  arion-project = super.recurseIntoAttrs {
+    haskellPkgs = super.haskellPackages.extend (import ./haskell-overlay.nix self super);
+    shell = haskellPkgs.shellFor {
+      packages = p: [p.arion-compose];
+      buildInputs = [
+        haskellPkgs.cabal-install
+        haskellPkgs.ghcid
+      ];
+    };
+  };
 }

shell.nix

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+(import ./nix {}).arion-project.shell

src/haskell/exe/Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

src/haskell/test/Arion/FooSpec.hs

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+module Arion.FooSpec
+  ( spec
+  )
+where
+
+import           Test.Hspec
+import           Test.QuickCheck
+
+spec :: Spec
+spec = do
+  it "foo" $ property True

src/haskell/test/Spec.hs

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+module Spec
+  ( spec
+  )
+where
+
+import           Test.Hspec
+import qualified Arion.FooSpec
+
+spec :: Spec
+spec = do
+  describe "Arion.Foo" Arion.FooSpec.spec

src/haskell/test/TestMain.hs

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+module Main where
+
+import           Protolude
+import           Test.Hspec.Runner
+import qualified Spec
+
+main :: IO ()
+main = hspecWith config Spec.spec
+  where config = defaultConfig { configColorMode = ColorAlways }