migrating dev environments to output

modules/dev/python.nix

@@ -4,34 +4,54 @@
   pkgs,
   ...
 }:
+let
+  python = pkgs.python3.withPackages (
+    ps:
+    builtins.attrValues {
+      inherit (ps)
+        black # Python code formatter
+        editorconfig # follow rules of contributin
+        flake8 # wraper for pyflakes, pycodestyle and mccabe
+        isort # sort Python imports
+        pyflakes # checks source code for errors
+        pylint # bug and style checker for python
+        pytest # tests
+        speedtest-cli # check internet speed from the comand line
+        ;
+    }
+  );
+  packages =
+    [ python ]
+    ++ builtins.attrValues {
+      inherit (pkgs)
+        pipenv # python development workflow for humans
+        pyright # LSP
+        ;
+    };
+in
 {
-  options.my.dev.python.enable = lib.mkEnableOption "enable";
-  config = lib.mkIf config.my.dev.python.enable {
-    home-manager.users.jawz.xdg.configFile."python/pythonrc".source = ../../dotfiles/pythonrc;
-    environment.variables.PYTHONSTARTUP = "\${XDG_CONFIG_HOME}/python/pythonrc";
-    users.users.jawz.packages =
-      builtins.attrValues {
-        inherit (pkgs)
-          pipenv # python development workflow for humans
-          pyright # LSP
-          ;
-      }
-      ++ [
-        (pkgs.python3.withPackages (
-          ps:
-          builtins.attrValues {
-            inherit (ps)
-              black # Python code formatter
-              editorconfig # follow rules of contributin
-              flake8 # wraper for pyflakes, pycodestyle and mccabe
-              isort # sort Python imports
-              pyflakes # checks source code for errors
-              pylint # bug and style checker for python
-              pytest # tests
-              speedtest-cli # check internet speed from the comand line
-              ;
-          }
-        ))
-      ];
+  options = {
+    my.dev.python.enable = lib.mkEnableOption "Install Python tools globally";
+    devShells.python = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.mkShell {
+        inherit packages;
+        name = "python-dev-shell";
+        shellHook = ''
+          echo "🐍 Python dev environment"
+          which python
+        '';
+        description = "Python development shell";
+      };
+    };
   };
+  config = lib.mkMerge [
+    (lib.mkIf config.my.dev.python.enable {
+      users.users.jawz.packages = packages;
+    })
+    {
+      home-manager.users.jawz.xdg.configFile."python/pythonrc".source = ../../dotfiles/pythonrc;
+      environment.variables.PYTHONSTARTUP = "\${XDG_CONFIG_HOME}/python/pythonrc";
+    }
+  ];
 }