refactor(nix): clean flake

flake.nix

@@ -1,6 +1,7 @@
 {
 	inputs = {
 		nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+
 		hooks = {
 			url = "github:cachix/git-hooks.nix";
 			inputs.nixpkgs.follows = "nixpkgs";
@@ -32,217 +33,25 @@
 	outputs = {
 		uv,
 		self,
-		hooks,
 		nixpkgs,
-		pyproject,
-		build-systems,
 		...
 	}: let
 		inherit (nixpkgs) lib;
-
-		getPythonVersion = let
-			val = builtins.getEnv "PYTHON_VERSION";
-			result =
-				if val == ""
-				then "3.13"
-				else val;
-		in
-			builtins.replaceStrings ["."] [""] result;
+		inherit (import ./nix/helpers.nix {inherit self nixpkgs overlay;}) forAllSystems;
 
 		workspace = uv.lib.workspace.loadWorkspace {workspaceRoot = ./.;};
 		overlay = workspace.mkPyprojectOverlay {sourcePreference = "wheel";};
 
-		forAllSystems = f:
-			lib.genAttrs [
-				"x86_64-linux"
-				"aarch64-linux"
-				"x86_64-darwin"
-				"aarch64-darwin"
-			] (system:
-					f rec {
-						inherit system;
-
-						pkgs = nixpkgs.legacyPackages.${system};
-						python = pkgs."python${getPythonVersion}";
-
-						pythonSet =
-							(pkgs.callPackage pyproject.build.packages {inherit python;}).overrideScope (
-								lib.composeManyExtensions [
-									build-systems.overlays.default
-									overlay
-								]
-							);
+		importWithAttrs = path:
+			forAllSystems (attrs:
+					import path {
+						inherit workspace self lib;
+						inherit (attrs) pkgs system python pythonSet;
 					});
 	in {
-		devShells =
-			forAllSystems ({
-					pkgs,
-					system,
-					python,
-					pythonSet,
-					...
-				}: let
-					check = self.checks.${system}.pre-commit;
-				in {
-					default = let
-						editableOverlay =
-							workspace.mkEditablePyprojectOverlay {
-								root = "$REPO_ROOT";
-							};
-
-						editablePythonSet =
-							pythonSet.overrideScope (
-								lib.composeManyExtensions [
-									editableOverlay
-
-									(final: prev: {
-											proselint =
-												prev.proselint.overrideAttrs (old: {
-														nativeBuildInputs =
-															old.nativeBuildInputs
-															++ final.resolveBuildSystem {
-																editables = [];
-															};
-													});
-										})
-
-									(final: prev: {
-											google-re2 =
-												prev.google-re2.overrideAttrs (old: {
-														nativeBuildInputs =
-															(old.nativeBuildInputs or [])
-															++ (with final; [setuptools pybind11])
-															++ (with pkgs; [re2 abseil-cpp]);
-													});
-										})
-								]
-							);
-
-						virtualenv = editablePythonSet.mkVirtualEnv "proselint-env" {proselint = ["test" "dev" "web"];};
-					in
-						pkgs.mkShell {
-							buildInputs = check.enabledPackages;
-
-							packages = [
-								virtualenv
-								pkgs.git-cliff
-								pkgs.typos
-								pkgs.uv
-							];
-
-							env = {
-								UV_NO_SYNC = "1";
-								UV_PYTHON = python.interpreter;
-								UV_PYTHON_DOWNLOADS = "never";
-								LD_LIBRARY_PATH = "${pkgs.stdenv.cc.cc.lib}/lib";
-							};
-
-							shellHook =
-								''
-									export REPO_ROOT=$(git rev-parse --show-toplevel)
-									unset PYTHONPATH
-								''
-								+ check.shellHook;
-						};
-				});
-
-		packages =
-			forAllSystems ({
-					pythonSet,
-					pkgs,
-					...
-				}: {
-					default = pythonSet.mkVirtualEnv "proselint-env" workspace.deps.default;
-
-					wheel =
-						pythonSet.proselint.override {
-							pyprojectHook = pythonSet.pyprojectDistHook;
-						};
-
-					sdist =
-						(pythonSet.proselint.override {
-								pyprojectHook = pythonSet.pyprojectDistHook;
-							}).overrideAttrs (old: {
-								env.uvBuildType = "sdist";
-							});
-
-					api = let
-						env =
-							pythonSet.mkVirtualEnv "proselint-api-env" {
-								proselint = ["web"];
-							};
-					in
-						pkgs.stdenv.mkDerivation {
-							name = "proselint-api";
-							src = ./.;
-
-							dontBuild = true;
-							dontConfigure = true;
-
-							installPhase = ''
-								mkdir -p $out/bin $out/share/proselint-api
-
-								cp $src/app.py $out/share/proselint-api
-
-								cat > $out/bin/proselint-api-run <<-EOF
-								#!${pkgs.bash}/bin/bash
-								cd $out/share/proselint-api
-								exec ${env}/bin/uvicorn app:app "\$@"
-								EOF
-
-								chmod +x $out/bin/proselint-api-run
-							'';
-						};
-				});
-
-		apps =
-			forAllSystems ({system, ...}: {
-					default = {
-						type = "app";
-						program = "${self.packages.${system}.default}/bin/proselint";
-					};
-
-					api = {
-						type = "app";
-						program = "${self.packages.${system}.api}/bin/proselint-api-run";
-					};
-				});
-
-		checks =
-			forAllSystems ({
-					system,
-					pkgs,
-					...
-				}: {
-					pre-commit =
-						hooks.lib.${system}.run {
-							src = ./.;
-							package = pkgs.prek;
-
-							hooks = {
-								trim-trailing-whitespace.enable = true;
-								end-of-file-fixer.enable = true;
-								mixed-line-endings.enable = true;
-								markdownlint.enable = true;
-
-								ruff.enable = true;
-								pyright = let
-									pyright = pkgs.basedpyright;
-								in {
-									enable = true;
-									package = pyright;
-									entry = "${pyright}/bin/basedpyright";
-								};
-
-								convco.enable = true;
-
-								alejandra.enable = true;
-								statix = {
-									enable = true;
-									settings.ignore = ["/.direnv"];
-								};
-							};
-						};
-				});
+		devShells = importWithAttrs ./nix/dev-shells.nix;
+		packages = importWithAttrs ./nix/packages.nix;
+		checks = importWithAttrs ./nix/checks.nix;
+		apps = importWithAttrs ./nix/apps.nix;
 	};
 }

nix/apps.nix

@@ -0,0 +1,16 @@
+{
+	lib,
+	self,
+	system,
+	...
+}: {
+	default = {
+		type = "app";
+		program = lib.getExe' self.packages.${system}.default "proselint";
+	};
+
+	api = {
+		type = "app";
+		program = lib.getExe' self.packages.${system}.api "proselint-api-run";
+	};
+}

nix/checks.nix

@@ -0,0 +1,34 @@
+{
+	lib,
+	self,
+	pkgs,
+	system,
+	...
+}: {
+	pre-commit =
+		self.inputs.hooks.lib.${system}.run {
+			src = ./.;
+			package = pkgs.prek;
+
+			hooks = {
+				trim-trailing-whitespace.enable = true;
+				end-of-file-fixer.enable = true;
+				mixed-line-endings.enable = true;
+				markdownlint.enable = true;
+				alejandra.enable = true;
+				convco.enable = true;
+				ruff.enable = true;
+
+				statix = {
+					enable = true;
+					settings.ignore = ["/.direnv"];
+				};
+
+				pyright = {
+					enable = true;
+					package = pkgs.basedpyright;
+					entry = lib.getExe pkgs.basedpyright;
+				};
+			};
+		};
+}

nix/dev-shells.nix

@@ -0,0 +1,66 @@
+{
+	workspace,
+	self,
+	lib,
+	system,
+	pkgs,
+	python,
+	pythonSet,
+}: let
+	check = self.checks.${system}.pre-commit;
+
+	editablePythonSet =
+		pythonSet.overrideScope (
+			lib.composeManyExtensions [
+				(workspace.mkEditablePyprojectOverlay {root = "$REPO_ROOT";})
+
+				(final: prev: {
+						proselint =
+							prev.proselint.overrideAttrs (old: {
+									nativeBuildInputs =
+										old.nativeBuildInputs
+										++ final.resolveBuildSystem {
+											editables = [];
+										};
+								});
+					})
+
+				(final: prev: {
+						google-re2 =
+							prev.google-re2.overrideAttrs (old: {
+									nativeBuildInputs =
+										(old.nativeBuildInputs or [])
+										++ (with final; [setuptools pybind11])
+										++ (with pkgs; [re2 abseil-cpp]);
+								});
+					})
+			]
+		);
+in {
+	default =
+		pkgs.mkShell {
+			buildInputs = check.enabledPackages;
+
+			packages = [
+				(editablePythonSet.mkVirtualEnv "proselint-env" {proselint = ["test" "dev" "web"];})
+
+				pkgs.git-cliff
+				pkgs.typos
+				pkgs.uv
+			];
+
+			env = {
+				UV_NO_SYNC = "1";
+				UV_PYTHON = python.interpreter;
+				UV_PYTHON_DOWNLOADS = "never";
+				LD_LIBRARY_PATH = "${pkgs.stdenv.cc.cc.lib}/lib";
+			};
+
+			shellHook =
+				''
+					export REPO_ROOT=$(git rev-parse --show-toplevel)
+					unset PYTHONPATH
+				''
+				+ check.shellHook;
+		};
+}

nix/helpers.nix

@@ -0,0 +1,36 @@
+{
+	self,
+	nixpkgs,
+	overlay,
+}: let
+	getPythonVersion = let
+		val = builtins.getEnv "PYTHON_VERSION";
+
+		result =
+			if val == ""
+			then "3.13"
+			else val;
+	in
+		builtins.replaceStrings ["."] [""] result;
+in {
+	forAllSystems = f:
+		nixpkgs.lib.genAttrs [
+			"x86_64-linux"
+			"aarch64-linux"
+			"x86_64-darwin"
+			"aarch64-darwin"
+		] (system:
+				f rec {
+					inherit system;
+
+					pkgs = nixpkgs.legacyPackages.${system};
+					python = pkgs."python${getPythonVersion}";
+					pythonSet =
+						(pkgs.callPackage self.inputs.pyproject.build.packages {inherit python;}).overrideScope (
+							nixpkgs.lib.composeManyExtensions [
+								self.inputs.build-systems.overlays.default
+								overlay
+							]
+						);
+				});
+}