Use devenv

template/devenv/flake.nix

@@ -0,0 +1,43 @@
+{
+  inputs = {
+    devenv.url = "github:cachix/devenv";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs-python.url = "github:cachix/nixpkgs-python";
+  };
+
+  outputs = inputs @ {
+    self,
+    devenv,
+    flake-utils,
+    nixpkgs,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfree = true;
+      };
+    in {
+      packages = {
+        devenv-up = self.devShells.${system}.default.config.procfileScript;
+        devenv-test = self.devShells.${system}.default.config.test;
+      };
+
+      devShells.default = devenv.lib.mkShell {
+        inherit inputs pkgs;
+        modules = [
+          {
+            git-hooks.hooks.alejandra.enable = true;
+            languages = {
+              nix.enable = true;
+              # python.enable = true;
+              # r.enable = true;
+              # rust.enable = true;
+              # typst.enable = true;
+            };
+          }
+        ];
+      };
+    });
+}