add nix flake setup

.envrc

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

.gitignore

@@ -7,3 +7,7 @@
 
 # ignore for now because it contains WiFi secrets
 /sdkconfig.defaults
+
+/.direnv
+
+/.cache/

dependencies.lock

@@ -1,22 +1,22 @@
 dependencies:
   espressif/mdns:
-    component_hash: ed10ef031bce505e423c5dbf0fdf2ce7a02df5f9ebffb18df2d6b9852e48817d
+    component_hash: 31117d76cae83a6d83ffd7f035f6fdae5bd05b914fc30b641afeb208b84de19a
     source:
       service_url: https://api.components.espressif.com/
       type: service
-    version: 1.3.1
+    version: 1.3.2
   idf:
     component_hash: null
     source:
       type: idf
-    version: 5.2.1
+    version: 5.2.2
   lvgl/lvgl:
     component_hash: 02894f8cb64e84819ee39caaa5d60398bf7495b4b5d2d7a12106c384bd5cbe01
     source:
       git: https://github.com/lvgl/lvgl
       path: .
       type: git
     version: b16aa3c558cc0aee2c02b1d043da9ae81597a194
-manifest_hash: 5c9117287fc9cb6d03856f3b7ca961f5c95298ba6283d4ba4dae82662f5098cd
+manifest_hash: 650af42e3a449c7fbc7e3524f2b1f56a5d2a2e8e0bc432be378b1cc28ce29eab
 target: esp32
 version: 1.0.0

flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "Nix flake for esp32-idf";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    # FIXME: Temporary https://github.com/mirrexagon/nixpkgs-esp-dev/pull/56.
+    # Reset to "github:mirrexagon/nixpkgs-esp-dev" when merged.
+    esp-dev.url = "github:Lindboard/nixpkgs-esp-dev";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    esp-dev,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs =
+        import nixpkgs
+        {
+          inherit system;
+        }
+        // esp-dev.packages.${system};
+    in {
+      formatter = pkgs.alejandra;
+
+      devShells.default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          esp-idf-esp32
+        ];
+      };
+    });
+}