Use Nix Flake to manage dependencies, upgrade dependencies

Author: ad-si

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,3 +1,4 @@
+.direnv
 .DS_Store
 /.stack-work
 /.vscode

flake.lock

@@ -0,0 +1,37 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      utils,
+    }:
+    utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            bash
+            coreutils
+            git-cliff
+            gnumake
+            haskell.compiler.ghc98
+            haskellPackages.cabal-fmt
+            haskellPackages.cabal-install
+            haskellPackages.fourmolu
+            haskellPackages.haskell-language-server
+            haskellPackages.hlint
+            haskellPackages.stack
+          ];
+        };
+        formatter = pkgs.nixfmt-tree; # Format this file with `nix fmt`
+      }
+    );
+}

flake.nix

@@ -1,4 +1,4 @@
-resolver: lts-22.4
+resolver: lts-23.18
 packages:
   - .
 extra-deps:

stack.yaml

@@ -1,7 +1,7 @@
 # This file was autogenerated by Stack.
 # You should not edit this file by hand.
 # For more information, please see the documentation at:
-#   https://docs.haskellstack.org/en/stable/lock_files
+#   https://docs.haskellstack.org/en/stable/topics/lock_files
 
 packages:
 - completed:
@@ -13,7 +13,7 @@ packages:
     hackage: github-0.29
 snapshots:
 - completed:
-    sha256: 8b211c5a6aad3787e023dfddaf7de7868968e4f240ecedf14ad1c5b2199046ca
-    size: 714097
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/22/4.yaml
-  original: lts-22.4
+    sha256: d133abe75e408a407cce3f032c96ac1bbadf474a93b5156ebf4135b53382d56b
+    size: 683827
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/23/18.yaml
+  original: lts-23.18