rewrite to python: redo nix packaging

.envrc

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

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1762482733,
+        "narHash": "sha256-g/da4FzvckvbiZT075Sb1/YDNDr+tGQgh4N8i5ceYMg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e1ebeec86b771e9d387dd02d82ffdc77ac753abc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -1,7 +1,84 @@
 {
-  inputs = { };
-  outputs = inputs@{ self, ...}: {
-    map-markers = import ./map-markers;
-    map-lib = import ./map-markers/lib.nix;
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }: let
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+
+    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in f system pkgs);
+
+    inherit (nixpkgs) lib;
+
+  in {
+    apps = forAllSystems (system: pkgs: let
+      mkApp = package: {
+        type = "app";
+        program = lib.getExe package;
+      };
+    in {
+      default = mkApp self.packages.${system}.default;
+    });
+
+    devShells = forAllSystems (_: pkgs: {
+      default = pkgs.mkShell {
+        packages = with pkgs; [
+          uv
+          (python3.withPackages (ps: with ps; []))
+          biome
+        ];
+      };
+    });
+
+    overlays.default = final: prev: self.packages.${final.system};
+
+    packages = forAllSystems (system: pkgs: {
+      default = self.packages.${system}.mckart;
+
+      mckart = let
+        pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);
+      in with pkgs.python3Packages; buildPythonPackage {
+        pname = pyproject.project.name;
+        version = pyproject.project.version;
+        src = lib.cleanSource ./.;
+
+        format = "pyproject";
+
+        build-system = [ hatchling ];
+        dependencies = [];
+
+        meta.mainProgram = "mckart";
+      };
+
+      bluemap-export = pkgs.runCommand "bluemap-export" {
+        buildInputs = [ (self.packages.${system}.mckart) ];
+      } ''
+        mckart export-bluemap --output-dir "$out"
+      '';
+
+      mapcrafter-export = pkgs.runCommand "mapcrafter-export" {
+        buildInputs = [
+          (self.packages.${system}.mckart)
+          pkgs.biome
+        ];
+
+        biomeConf = builtins.toJSON {
+          formatter = {
+            indentStyle = "space";
+            lineWidth = 100;
+          };
+        };
+        passAsFile = [ "biomeConf" ];
+      } ''
+        mckart export-mapcrafter --output-dir "$out"
+        cp "$biomeConfPath" ./biome.json
+        biome format --config-path=./biome.json "$out"/* --write
+      '';
+    });
   };
 }