add --no-postprocessors command-line option (#2725)

gallery_dl/job.py

@@ -439,6 +439,9 @@ class DownloadJob(Job):
             if self.archive:
                 self.archive.check = pathfmt.exists
 
+        if not cfg("postprocess", True):
+            return
+
         postprocessors = extr.config_accumulate("postprocessors")
         if postprocessors:
             self.hooks = collections.defaultdict(list)

gallery_dl/option.py

@@ -283,6 +283,11 @@ def build_parser():
         dest="download", nargs=0, action=ConfigConstAction, const=False,
         help=("Do not download any files")
     )
+    downloader.add_argument(
+        "--no-postprocessors",
+        dest="postprocess", nargs=0, action=ConfigConstAction, const=False,
+        help=("Do not run any post processors")
+    )
     downloader.add_argument(
         "--no-check-certificate",
         dest="verify", nargs=0, action=ConfigConstAction, const=False,