Add custom args to GUI and add arg conflict validation to workers

lib/render_workers/render_worker.py

@@ -92,8 +92,28 @@ class BaseRenderWorker(object):
             logging.exception(e)
         return path
 
-    def _generate_subprocess(self):
-        raise NotImplementedError("_generate_subprocess not implemented")
+    def validate(self):
+        if not os.path.exists(self.input_path):
+            raise FileNotFoundError(f"Cannot find input path: {self.input_path}")
+        self.generate_subprocess()
+
+    def generate_subprocess(self):
+        # Convert raw args from string if available and catch conflicts
+        cmd = self.generate_worker_subprocess()
+        raw_args = self.args.get('raw', None)
+        if raw_args:
+            import shlex
+            args_split = shlex.split(raw_args)
+            flags = [x for x in args_split if x.startswith('-')]
+            conflict = any(element in flags for element in args_split)
+            if conflict:
+                raise ValueError("Custom args conflicts set parameters")
+            else:
+                cmd.extend(args_split)
+        return cmd
+
+    def generate_worker_subprocess(self):
+        raise NotImplementedError("generate_worker_subprocess not implemented")
 
     def start(self):