From b3484d330de30282d4ae4f94a883a1db81f5f03d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9F=B3=E3=A6=A1?=
 <215371699+0ngk@users.noreply.github.com>
Date: Thu, 9 Jul 2026 15:01:02 +0900
Subject: [PATCH 1/2] build(nix): use nix flakes for development env

---
 .envrc     |  1 +
 .gitignore |  3 +++
 flake.lock | 27 ++++++++++++++++++++
 flake.nix  | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+)
 create mode 100644 .envrc
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 599be4e..14037e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,6 @@
 *.ez
 /build
 erl_crash.dump
+
+
+.direnv/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..d38172b
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1783279667,
+        "narHash": "sha256-/NAkDSsve+GNM0Bt6tleJdCGfsTlK89nPjkVOzZMo0s=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f205b5574fd0cb7da5b702a2da51507b7f4fdd1b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "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 0000000..e5d4357
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,72 @@
+{
+  description = "Development environment for kitazith";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+
+    forAllSystems = nixpkgs.lib.genAttrs systems;
+
+    pkgsFor = system:
+      import nixpkgs {
+        inherit system;
+      };
+  in {
+    devShells = forAllSystems (system: let
+      pkgs = pkgsFor system;
+
+      ci-check = pkgs.writeShellApplication {
+        name = "ci-check";
+        runtimeInputs = [
+          pkgs.bash
+          pkgs.coreutils
+          pkgs.findutils
+          pkgs.git
+          pkgs.gleam
+          pkgs.erlang
+          pkgs.rebar3
+          pkgs.nodejs_22
+        ];
+        text = ''
+          bash ./scripts/validate_packages.sh
+        '';
+      };
+    in {
+      default = pkgs.mkShell {
+        packages = [
+          pkgs.bash
+          pkgs.coreutils
+          pkgs.findutils
+          pkgs.git
+
+          pkgs.gleam
+          pkgs.erlang
+          pkgs.rebar3
+
+          pkgs.nodejs_22
+
+          ci-check
+        ];
+
+        shellHook = ''
+          echo "kitazith dev shell"
+          echo "Commands:"
+          echo "  gleam build"
+          echo "  gleam test"
+          echo "  ci-check"
+        '';
+      };
+    });
+  };
+}

From 2323e9bb4d34a2a9b8bfb496af7c089a0a48475d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9F=B3=E3=A6=A1?=
 <215371699+0ngk@users.noreply.github.com>
Date: Thu, 9 Jul 2026 15:07:10 +0900
Subject: [PATCH 2/2] build(nix): fix evaluation warning for erlang

---
 flake.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/flake.nix b/flake.nix
index e5d4357..aef3a88 100644
--- a/flake.nix
+++ b/flake.nix
@@ -34,7 +34,7 @@
           pkgs.findutils
           pkgs.git
           pkgs.gleam
-          pkgs.erlang
+          pkgs.beamPackages.erlang
           pkgs.rebar3
           pkgs.nodejs_22
         ];
@@ -51,7 +51,7 @@
           pkgs.git
 
           pkgs.gleam
-          pkgs.erlang
+          pkgs.beamPackages.erlang
           pkgs.rebar3
 
           pkgs.nodejs_22