add nix flake files

.gitignore

@@ -8,4 +8,5 @@
 *.py[co]
 .DS_Store
 .webassets-cache
-build
+/source/build
+result

flake.lock

@@ -0,0 +1,44 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1659446231,
+        "narHash": "sha256-hekabNdTdgR/iLsgce5TGWmfIDZ86qjPhxDg/8TlzhE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "eabc38219184cc3e04a974fe31857d8e0eac098d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,104 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.11";
+    #nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, ... }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
+    in
+    {
+      packages = forAllSystems (system: let
+        pkgs_system = pkgs.${system};
+        stdenv = nixpkgs.legacyPackages.${system}.stdenv;
+        python = pkgs_system.python3;
+        whitenoise = with python.pkgs; buildPythonPackage rec {
+          pname = "whitenoise";
+          version = "4.1.4";
+          src = fetchPypi {
+            inherit pname version;
+            sha256 = "22f79cf8f1f509639330f93886acaece8ec5ac5e9600c3b981d33c34e8a42dfd";
+          };
+          doCheck = false;
+          propagatedBuildInputs = [
+            setuptools
+            django
+          ];
+        };
+        multipart = with python.pkgs; buildPythonPackage rec {
+          pname = "multipart";
+          version = "0.2.4";
+          src = fetchPypi {
+            inherit pname version;
+            sha256 = "06ba205360bc7096fefe618e4f1e9b2cdb890b4f2157053a81f386912a2522cb";
+          };
+          doCheck = true;
+          propagatedBuildInputs = [
+            setuptools
+          ];
+        };
+        proper-cli = with python.pkgs; buildPythonPackage rec {
+          pname = "proper-cli";
+          version = "1.0";
+          format = "pyproject";
+          src = fetchPypi {
+            inherit pname version;
+            sha256 = "67313e8ed5a2519ca224fe5f0e9237898960b7bb964ea4024e20ed8ee9773b67";
+          };
+          doCheck = true;
+          propagatedBuildInputs = [
+            setuptools
+          ];
+        };
+        clay = with python.pkgs; buildPythonPackage rec {
+          pname = "clay";
+          version = "4.6.2";
+          format = "pyproject";
+          src = fetchPypi {
+            inherit pname version;
+            sha256 = "e822c67532895b4f03aa5ae8270ab52b59ba55b492d446c51b28d1ed7f839514";
+          };
+          doCheck = true;
+          propagatedBuildInputs = [
+            setuptools
+            pyyaml
+            whitenoise
+            gunicorn
+            proper-cli
+            multipart
+            jinja2
+          ];
+        };
+        my_python  = python.withPackages (ps: [clay]);
+      in{
+        clay = clay;
+        my_python = my_python;
+        default =  stdenv.mkDerivation {
+            name = "milliways";
+            unpackPhase = "";
+            src = ./.;
+            buildPhase = ''
+              ${clay}/bin/clay build source
+            '';
+            installPhase = ''
+              cp source/build/ $out/ -r
+            '';
+        };
+      });
+
+      devShells = forAllSystems (system: {
+        default = pkgs.${system}.mkShellNoCC {
+          packages =  [
+            (pkgs.${system}.python3.withPackages (ps: [self.packages.${system}.clay]))
+          ];
+        };
+      });
+    };
+}