From 73097676945129da7111b126445bb67c6d8a0c5a Mon Sep 17 00:00:00 2001
From: James Santucci <james.santucci@gmail.com>
Date: Wed, 21 Jan 2026 16:02:58 -0800
Subject: [PATCH 1/2] Override haskell packages so flake build works

random must be on 1.3.1 for dataframe, which is incompatible with
time-compat's tests, so skip time-compat's tests
---
 flake.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/flake.nix b/flake.nix
index 0885547f..f25a98ac 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,6 +13,8 @@
 
         hsPkgs = pkgs.haskellPackages.extend (self: super: {
           dataframe = self.callCabal2nix "dataframe" ./. { };
+          random = pkgs.haskellPackages.callHackage "random" "1.3.1" { };
+          time-compat = pkgs.haskell.lib.dontCheck super.time-compat;
         });
       in
       {

From a58e9affb0acbcc678cb40d93b6098f361aa7b63 Mon Sep 17 00:00:00 2001
From: James Santucci <james.santucci@gmail.com>
Date: Wed, 21 Jan 2026 16:01:17 -0800
Subject: [PATCH 2/2] Use the package definition to construct the dev shell

Using the package means that e.g. `cabal repl` works with
all of the dependencies / package-defined code, so you can

```
$ cabal repl
[...]
Ok, 46 modules loaded.
ghci> import DataFrame.IO.CSV
ghci> readCsv "foo.csv"
---------
 a  |  b
----|----
Int | Int
----|----
1   | 2
3   | 4
5   | 6
```
---
 flake.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/flake.nix b/flake.nix
index f25a98ac..0eae9846 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,12 +22,14 @@
           default = hsPkgs.dataframe;
         };
 
-        devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
+        devShells.default = hsPkgs.shellFor {
+          packages = ps: [ (ps.callCabal2nix "dataframe" ./. { }) ];
+          nativeBuildInputs = with pkgs; [
             ghc
             cabal-install
             haskell-language-server
           ];
+          withHoogle = true;
         };
       });
 }