From 3cd99e3f0b763cb2eefa503a195738ea25be68ed Mon Sep 17 00:00:00 2001
From: Alexander Kobjolke <me@failco.de>
Date: Tue, 29 Aug 2023 21:07:33 +0200
Subject: [PATCH] Add 'doctest' as a cabal test

We provide a simple wrapper that executes `doctest` on our `src`
directory. This allows us to run all doctests during a regular `cabal
test` run.
---
 flake.nix    |  2 +-
 hcat.cabal   | 19 +++++++++++++++++++
 package.yaml | 13 +++++++------
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/flake.nix b/flake.nix
index 0d630c6..a665510 100644
--- a/flake.nix
+++ b/flake.nix
@@ -70,12 +70,12 @@
             haskellPackages.haskell-language-server
             haskellPackages.fourmolu
             haskellPackages.hspec-discover
+            haskellPackages.doctest
             cabal-install
             ghcid
             nixfmt
             hpack
             hlint
-            haskellPackages.doctest
           ];
         };
       });
diff --git a/hcat.cabal b/hcat.cabal
index f84a895..9c3766b 100644
--- a/hcat.cabal
+++ b/hcat.cabal
@@ -50,6 +50,25 @@ executable hcat
     , hcat
   default-language: GHC2021
 
+test-suite doctest
+  type: exitcode-stdio-1.0
+  main-is: Doctest.hs
+  other-modules:
+      Paths_hcat
+  hs-source-dirs:
+      test/doctest
+  default-extensions:
+      BlockArguments
+      OverloadedStrings
+      ImportQualifiedPost
+  ghc-options: -Wall -fdefer-typed-holes
+  build-tool-depends:
+      doctest:doctest
+  build-depends:
+      base >=4.13 && <5
+    , process
+  default-language: Haskell2010
+
 test-suite spec
   type: exitcode-stdio-1.0
   main-is: Spec.hs
diff --git a/package.yaml b/package.yaml
index b2d6beb..d15b892 100644
--- a/package.yaml
+++ b/package.yaml
@@ -56,9 +56,10 @@ tests:
     build-tools: hspec-discover
     verbatim:
       default-language: GHC2021
-  # doctest:
-  #   main: Doctest.hs
-  #   source-dirs:
-  #     - test/doctest
-  #   dependencies:
-  #     - process
+  doctest:
+    main: Doctest.hs
+    source-dirs:
+      - test/doctest
+    dependencies:
+      - process
+    build-tools: doctest