feat: auto-patch function

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

patch.nix

@@ -1,19 +1,45 @@
-{nvidia-patch-list}: let
+{ nvidia-patch-list }:
-  createPatch = patchList: object: driverPackage:
+let
-    driverPackage.overrideAttrs ({
+  createPatch =
-      version,
+    patchList: object: driverPackage:
-      preFixup ? "",
+    driverPackage.overrideAttrs (
-      ...
+      {
-    }: let
+        version,
-      patch = patchList.${version};
+        preFixup ? "",
-    in {
+        ...
-      preFixup =
+      }:
-        preFixup
+      let
-        + ''
+        patch = patchList.${version};
+      in
+      {
+        preFixup = preFixup + ''
           sed -i '${patch}' $out/lib/${object}.${version}
         '';
-    });
+      }
-in {
+    );
+
   patch-nvenc = createPatch nvidia-patch-list.nvenc "libnvidia-encode.so";
   patch-fbc = createPatch nvidia-patch-list.fbc "libnvidia-fbc.so";
+
+  auto-patch =
+    nvidiaPackage:
+    let
+      maybeFbc =
+        if builtins.hasAttr nvidiaPackage.version nvidia-patch-list.fbc then
+          patch-fbc nvidiaPackage
+        else
+          nvidiaPackage;
+
+      maybeNvenc =
+        if builtins.hasAttr maybeFbc.version nvidia-patch-list.nvenc then
+          patch-nvenc maybeFbc
+        else
+          maybeFbc;
+
+      nvidiaPackageFinal = maybeNvenc;
+    in
+    nvidiaPackageFinal;
+in
+{
+  inherit patch-nvenc patch-fbc auto-patch;
 }