home/direnv: add auto prune timer

home/home.nix

@@ -11,7 +11,7 @@ in {
 
     ./programs/atuin.nix
     ./programs/comma.nix
-    ./programs/direnv.nix
+    ./programs/direnv
     ./programs/gdb.nix
     ./programs/gh.nix
     ./programs/git

home/programs/direnv/auto-prune.nix

@@ -0,0 +1,38 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.programs.direnv;
+in
+{
+  config = {
+    systemd.user.services.prune-allowed-direnv-dirs = {
+      Unit = {
+        Description = "Prune unused allowed directories for direnv";
+        Documentation = [ "man:direnv(1)" ];
+      };
+
+      Service = {
+        Type = "oneshot";
+        CPUSchedulingPolicy = "idle";
+        IOSchedulingClass = "idle";
+        ExecStart = "${lib.getExe cfg.package} prune";
+      };
+    };
+
+    systemd.user.timers.prune-allowed-direnv-dirs = {
+      Unit = {
+        Description = "Prune unused allowed directories for direnv";
+        Documentation = [ "man:direnv(1)" ];
+      };
+
+      Timer = {
+        Unit = "prune-allowed-direnv-dirs.service";
+        OnCalendar = "daily";
+        Persistent = true;
+      };
+
+      Install = {
+        WantedBy = [ "timers.target" ];
+      };
+    };
+  };
+}

home/programs/direnv/default.nix

@@ -1,5 +1,9 @@
 { ... }:
 {
+  imports = [
+    ./auto-prune.nix
+  ];
+
   programs.direnv = {
     enable = true;
     enableZshIntegration = true;