Kde: load patches automatically

roles/kde/patches/default.nix

@@ -0,0 +1,30 @@
+{lib, ...}: let
+  rootDirs = builtins.readDir ./.;
+  removeFiles = lib.attrsets.filterAttrs (n: v: v == "directory") rootDirs;
+
+  getPatches = name:
+    builtins.map (value: ./${name}/${value}) (builtins.attrNames (
+      lib.attrsets.filterAttrs (
+        n: v:
+          v == "regular" && lib.strings.hasSuffix ".patch" n
+      ) (builtins.readDir ./${name})
+    ));
+
+  bigOverlay = final: prev:
+    builtins.mapAttrs (
+      name: _value:
+        prev."${name}".overrideAttrs {
+          version = prev."${name}".version + "-patched";
+          patches = prev."${name}".patches ++ getPatches name;
+        }
+    )
+    removeFiles;
+in {
+  nixpkgs.overlays = [
+    (
+      final: prev: {
+        kdePackages = prev.kdePackages.overrideScope bigOverlay;
+      }
+    )
+  ];
+}