Flowtrack: private period tracker with cycle predictions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "Private, self-hosted period tracker with cycle predictions";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
+
+  outputs = { self, nixpkgs }:
+    let
+      forAllSystems = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ];
+    in
+    {
+      packages = forAllSystems (system:
+        let pkgs = import nixpkgs { inherit system; };
+        in {
+          default = pkgs.callPackage ./package.nix { };
+          flowtrack = self.packages.${system}.default;
+        });
+
+      nixosModules.default = import ./module.nix self;
+      nixosModules.flowtrack = self.nixosModules.default;
+
+      checks = forAllSystems (system:
+        let pkgs = import nixpkgs { inherit system; };
+        in {
+          inherit (self.packages.${system}) default;
+          tests = pkgs.runCommand "flowtrack-tests" { nativeBuildInputs = [ pkgs.python3 pkgs.nodejs ]; } ''
+            cp -r ${self} source
+            chmod -R u+w source
+            cd source
+            python3 -m unittest discover -s tests -v
+            python3 -m py_compile app.py
+            node --check static/app.js
+            node --check static/cycle.js
+            node tests/test_cycle.js
+            touch $out
+          '';
+        });
+    };
+}