From 813210c64f6bd5af4b32aed598c58f5d3923467e Mon Sep 17 00:00:00 2001
From: Kaare Hoff Skovgaard <kaare@kaareskovgaard.net>
Date: Sat, 5 Jul 2025 11:01:57 +0200
Subject: [PATCH] Add initial snowfall-lib and treefmt setup

---
 flake.nix   | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 treefmt.nix |  6 +++++
 2 files changed, 76 insertions(+)
 create mode 100644 flake.nix
 create mode 100644 treefmt.nix

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..481938f
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,70 @@
+{
+  description = "A simple base flake to be used as a starting point to avoid setting up everything for every flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+    snowfall-lib = {
+      url = "github:snowfallorg/lib";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      snowfall-lib,
+      treefmt-nix,
+    }:
+    let
+      forEachSystem = systems: map: nixpkgs.lib.genAttrs systems map;
+    in
+    {
+      lib.mkFlake =
+        options@{
+          systems ? [
+            "x86_64-linux"
+            "aarch64-linux"
+            "aarch64-darwin"
+          ],
+          devShellPackages ? (pkgs: [ ]),
+          treeFmtFile ? ./treefmt.nix,
+          ...
+        }:
+        let
+          snowfallOptions = builtins.removeAttrs options [
+            "systems"
+            "devShellPackages"
+            "treeFmtFile"
+          ];
+        in
+        (
+          snowfall-lib.lib.mkFlake snowfallOptions
+          // (forEachSystem systems (
+            system:
+            let
+              pkgs = import nixpkgs { inherit system; };
+              treeFmtEval = treefmt-nix.lib.evalModule pkgs treeFmtFile;
+            in
+            {
+              formatter = treeFmtEval.config.build.wrapper;
+              checks = {
+                fmt = treeFmtEval.config.build.check self;
+              };
+              devShells.default = pkgs.mkShell {
+                packages = [
+                  pkgs.nixfmt-rfc-style
+                  pkgs.nixd
+                ] ++ (devShellPackages pkgs);
+              };
+            }
+          ))
+        );
+    };
+}
diff --git a/treefmt.nix b/treefmt.nix
new file mode 100644
index 0000000..225d12c
--- /dev/null
+++ b/treefmt.nix
@@ -0,0 +1,6 @@
+{ ... }:
+{
+  projectRootFile = "flake.nix";
+  programs.nixfmt.enable = true;
+  programs.shfmt.enable = true;
+}