[postprocessor:exec] implement archive options (#3584)

gallery_dl/postprocessor/metadata.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2019-2022 Mike Fährmann
+# Copyright 2019-2023 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -83,28 +83,7 @@ class MetadataPP(PostProcessor):
             events = events.split(",")
         job.register_hooks({event: self.run for event in events}, options)
 
-        archive = options.get("archive")
-        if archive:
-            extr = job.extractor
-            archive = util.expand_path(archive)
-            archive_format = (
-                options.get("archive-prefix", extr.category) +
-                options.get("archive-format", "_MD_" + extr.archive_fmt))
-            try:
-                if "{" in archive:
-                    archive = formatter.parse(archive).format_map(
-                        job.pathfmt.kwdict)
-                self.archive = util.DownloadArchive(
-                    archive, archive_format, "_archive_metadata")
-            except Exception as exc:
-                self.log.warning(
-                    "Failed to open download archive at '%s' ('%s: %s')",
-                    archive, exc.__class__.__name__, exc)
-            else:
-                self.log.debug("Using download archive '%s'", archive)
-        else:
-            self.archive = None
-
+        self._init_archive(job, options, "_MD_")
         self.mtime = options.get("mtime")
         self.omode = options.get("open", omode)
         self.encoding = options.get("encoding", "utf-8")