From b278ca21951756049272c752bcf2601318633205 Mon Sep 17 00:00:00 2001
From: Rebecca Turner <rbt@sent.as>
Date: Thu, 20 Apr 2023 12:59:32 -0700
Subject: [PATCH] tests.haskell.incremental: init

---
 pkgs/test/haskell/default.nix             |  1 +
 pkgs/test/haskell/incremental/default.nix | 35 +++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 pkgs/test/haskell/incremental/default.nix

diff --git a/pkgs/test/haskell/default.nix b/pkgs/test/haskell/default.nix
index 337d2811c655..86764380ecc3 100644
--- a/pkgs/test/haskell/default.nix
+++ b/pkgs/test/haskell/default.nix
@@ -6,4 +6,5 @@ lib.recurseIntoAttrs {
   documentationTarball = callPackage ./documentationTarball { };
   setBuildTarget = callPackage ./setBuildTarget { };
   writers = callPackage ./writers { };
+  incremental = callPackage ./incremental { };
 }
diff --git a/pkgs/test/haskell/incremental/default.nix b/pkgs/test/haskell/incremental/default.nix
new file mode 100644
index 000000000000..b94a85277db3
--- /dev/null
+++ b/pkgs/test/haskell/incremental/default.nix
@@ -0,0 +1,35 @@
+# Demonstration of incremental builds for Haskell. Useful for speeding up CI.
+#
+# See: https://www.haskellforall.com/2022/12/nixpkgs-support-for-incremental-haskell.html
+# See: https://felixspringer.xyz/homepage/blog/incrementalHaskellBuildsWithNix
+
+{ haskell, lib }:
+
+let
+  inherit (haskell.lib.compose) overrideCabal;
+
+  # Incremental builds work with GHC >=9.4.
+  turtle = haskell.packages.ghc944.turtle;
+
+  # This will do a full build of `turtle`, while writing the intermediate build products
+  # (compiled modules, etc.) to the `intermediates` output.
+  turtle-full-build-with-incremental-output = overrideCabal (drv: {
+    doInstallIntermediates = true;
+    enableSeparateIntermediatesOutput = true;
+  }) turtle;
+
+  # This will do an incremental build of `turtle` by copying the previously
+  # compiled modules and intermediate build products into the source tree
+  # before running the build.
+  #
+  # GHC will then naturally pick up and reuse these products, making this build
+  # complete much more quickly than the previous one.
+  turtle-incremental-build = overrideCabal (drv: {
+    previousIntermediates = turtle-full-build-with-incremental-output.intermediates;
+  }) turtle;
+in
+  turtle-incremental-build.overrideAttrs (old: {
+    meta = {
+      maintainers = lib.teams.mercury.members;
+    };
+  })