Add flake and dev shell

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669833724,
+        "narHash": "sha256-/HEZNyGbnQecrgJnfE8d0WC5c1xuPSD2LUpB6YXlg4c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4d2b37a84fad1091b9de401eb450aae66f1a741e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "intake feed sources";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/22.11";
+
+  outputs = { self, nixpkgs }:
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    devShells.${system} = {
+      intake-rss = let
+        pythonEnv = pkgs.python38.withPackages (pypkgs: with pypkgs; [ black feedparser ]);
+      in pkgs.mkShell {
+        packages = [ pythonEnv ];
+        shellHook = ''
+          PS1="(intake-rss) $PS1"
+        '';
+      };
+    };
+  };
+}
+