chore: nix things

.envrc

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

.gitignore

@@ -1,3 +1,6 @@
+.direnv/
+data/
+
 # https://github.com/github/gitignore/blob/main/Python.gitignore
 # Basic .gitignore for a python repo.
 
@@ -130,6 +133,3 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
-
-# Data
-data

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1674641431,
+        "narHash": "sha256-qfo19qVZBP4qn5M5gXc/h1MDgAtPA5VxJm9s8RUAkVk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9b97ad7b4330aacda9b2343396eb3df8a853b4fc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,16 @@
+{
+  description = "Proj BE PI3D";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        devShell =
+          pkgs.mkShell { buildInputs = with pkgs; [ poetry python3 ]; };
+      });
+}