From dff471af7e1ea91fca5f7d30aebbb50ae3284398 Mon Sep 17 00:00:00 2001
From: damianfral <huevofritopamojarpan@gmail.com>
Date: Fri, 30 Dec 2022 16:00:15 +0000
Subject: [PATCH] Use nix-filter.

---
 flake.lock | 16 ++++++++++++++++
 flake.nix  | 23 +++++++++++++++++++----
 2 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/flake.lock b/flake.lock
index 1a215d8..58ee30b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -15,6 +15,21 @@
         "type": "github"
       }
     },
+    "nix-filter": {
+      "locked": {
+        "lastModified": 1666547822,
+        "narHash": "sha256-razwnAybPHyoAyhkKCwXdxihIqJi1G6e1XP4FQOJTEs=",
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "rev": "1a3b735e13e90a8d2fd5629f2f8363bd7ffbbec7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "nix-filter",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1672189105,
@@ -33,6 +48,7 @@
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
+        "nix-filter": "nix-filter",
         "nixpkgs": "nixpkgs"
       }
     }
diff --git a/flake.nix b/flake.nix
index fe069a5..fdc9847 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,14 +4,18 @@
   inputs = {
     nixpkgs = { url = "github:NixOS/nixpkgs/"; };
     flake-utils = { url = "github:numtide/flake-utils"; };
+    nix-filter.url = "github:numtide/nix-filter";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
+  outputs = { self, nixpkgs, flake-utils, nix-filter }:
 
     let
       pkgsFor = system: import nixpkgs {
         inherit system;
-        overlays = [ self.overlays.${system} ];
+        overlays = [
+          self.overlays.${system}
+          nix-filter.overlays.default
+        ];
       };
     in
 
@@ -19,6 +23,17 @@
       (system:
         let
           pkgs = pkgsFor system;
+          filteredSrc =
+            pkgs.nix-filter {
+              root = ./.;
+              include = [
+                "src/"
+                "package.yaml"
+                "LICENSE"
+                "benchmark/"
+                "brainfucks/"
+              ];
+            };
         in
         rec {
           packages = rec {
@@ -26,7 +41,7 @@
               pkgs.haskellPackages.brainhask;
             brainhask-bench-results = pkgs.stdenv.mkDerivation {
               name = "brainhask-bench-results";
-              src = ./.;
+              src = filteredSrc;
               buildPhase = ''
                 ${brainhask}/bin/brainhask-bench --output benchmark-results.html
               '';
@@ -69,7 +84,7 @@
               overrides = final.lib.composeExtensions
                 (old.overrides or (_: _: { }))
                 (self: super: {
-                  brainhask = self.callCabal2nix "brainhask" ./. { };
+                  brainhask = self.callCabal2nix "brainhask" filteredSrc { };
                 }
                 );
             });