feat: migrate from modules to features

features/calibre.nix

@@ -0,0 +1,22 @@
+{
+  nixos =
+    { pkgs, ... }:
+    {
+      environment.systemPackages = [ pkgs.calibre ];
+
+      # udev rules for kindle and mtp device access
+      # NOTE:(@janezicmatej) uses services.udev.packages instead of extraRules
+      # because extraRules writes to 99-local.rules which is too late for uaccess
+      # see https://github.com/NixOS/nixpkgs/issues/308681
+      services.udev.packages = [
+        pkgs.libmtp
+        (pkgs.writeTextFile {
+          name = "kindle-udev-rules";
+          text = ''
+            ACTION!="remove", SUBSYSTEM=="usb", ATTRS{idVendor}=="1949", TAG+="uaccess"
+          '';
+          destination = "/etc/udev/rules.d/70-kindle.rules";
+        })
+      ];
+    };
+}