feat(pkg): setup direnv for automatic directory environments

home.nix

@@ -39,6 +39,14 @@
     };
   };
 
+  # https://github.com/nix-community/nix-direnv/
+  programs.direnv =
+    {
+      enable = true;
+      enableZshIntegration = true;
+      nix-direnv.enable = true;
+    };
+
   services.unclutter.enable = true;
   services.gpg-agent.enable = true;
   services.blueman-applet.enable = true;

nixos/configuration.nix

@@ -122,6 +122,11 @@
   # networking.firewall.allowedUDPPorts = [ ... ];
   # Or disable the firewall altogether.
   # networking.firewall.enable = false;
+  # https://github.com/nix-community/nix-direnv/
+  nix.extraOptions = ''
+    keep-outputs = true
+    keep-derivations = true
+  '';
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions

programs/git.nix

@@ -25,6 +25,9 @@
       ".watsonrc"
       ".idea"
       ".vscode"
+      "shell.nix"
+      ".envrc"
+      ".direnv"
     ];
 
     # see https://github.com/dandavison/delta#get-started