misc: add nix flake

Author: hrenard

flake.lock

@@ -0,0 +1,78 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    pyproject-nix = {
+      url = "github:nix-community/pyproject.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    uv2nix = {
+      url = "github:adisbladis/uv2nix";
+      inputs.pyproject-nix.follows = "pyproject-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    pyproject-nix,
+    uv2nix,
+    systems,
+    ...
+  }: let
+    forEachSystem = nixpkgs.lib.genAttrs (import systems);
+    pkgsFor = forEachSystem (system: import nixpkgs {inherit system;});
+
+    workspace = uv2nix.lib.workspace.loadWorkspace {workspaceRoot = ./.;};
+
+    overlay = workspace.mkPyprojectOverlay {
+      sourcePreference = "wheel"; # or sourcePreference = "sdist";
+    };
+
+    pyprojectOverrides = _final: _prev: {
+    };
+
+    pythonSets = forEachSystem (
+      system:
+        (pkgsFor.${system}.callPackage pyproject-nix.build.packages {
+          python = pkgsFor.${system}.python312;
+        })
+        .overrideScope
+        (nixpkgs.lib.composeExtensions overlay pyprojectOverrides)
+    );
+  in {
+    formatter = forEachSystem (system: nixpkgs.legacyPackages.${system}.alejandra);
+
+    devShells = forEachSystem (system: {
+      default = let
+        editableOverlay = workspace.mkEditablePyprojectOverlay {
+          root = "$REPO_ROOT";
+        };
+        editablePythonSets = pythonSets.${system}.overrideScope editableOverlay;
+
+        virtualenv = editablePythonSets.mkVirtualEnv "scim2-cli" workspace.deps.all;
+      in
+        pkgsFor.${system}.mkShell {
+          packages = with pkgsFor.${system}; [
+            uv
+            virtualenv
+          ];
+          shellHook = ''
+            unset PYTHONPATH
+            export REPO_ROOT=$(git rev-parse --show-toplevel)
+          '';
+        };
+    });
+
+    packages = forEachSystem (system: {
+      default = pythonSets.${system}.mkVirtualEnv "scim2-cli" workspace.deps.default;
+    });
+
+    apps = forEachSystem (system: {
+      default = {
+        type = "app";
+        program = "${self.packages.${system}.default}/bin/scim2";
+      };
+    });
+  };
+}