From 0d0b2c3561aec6cf9db481072f6d3d6affda481c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Thallis?= <joaothallis@turn.io>
Date: Wed, 1 Apr 2026 19:40:01 -0300
Subject: [PATCH] Replace shell.nix with Nix flakes for reproducible dev
 environment

Migrates from legacy shell.nix (using <nixpkgs> channel) to a Nix flake
with pinned nixpkgs (nixos-25.11). Supports aarch64-darwin, x86_64-darwin,
x86_64-linux, and aarch64-linux.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 flake.lock | 27 +++++++++++++++++++++++++++
 flake.nix  | 28 ++++++++++++++++++++++++++++
 shell.nix  |  4 ----
 3 files changed, 55 insertions(+), 4 deletions(-)
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 delete mode 100644 shell.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..a83d9bf7
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1775002709,
+        "narHash": "sha256-d3Yx83vSrN+2z/loBh4mJpyRqr9aAJqlke4TkpFmRJA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bcd464ccd2a1a7cd09aa2f8d4ffba83b761b1d0e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..c793db89
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,28 @@
+{
+  description = "FlowRunner development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+  };
+
+  outputs =
+    { nixpkgs, ... }:
+    let
+      systems = [
+        "aarch64-darwin"
+        "x86_64-darwin"
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
+      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            beam28Packages.elixir_1_19
+          ];
+        };
+      });
+    };
+}
diff --git a/shell.nix b/shell.nix
deleted file mode 100644
index 823c5266..00000000
--- a/shell.nix
+++ /dev/null
@@ -1,4 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }:
-  pkgs.mkShell {
-    nativeBuildInputs = with pkgs.buildPackages; [ beam28Packages.elixir_1_19 ];
-}