merge #3675: [pixiv] fix --write-tags for '"tags": "original"'

gallery_dl/postprocessor/metadata.py

@@ -184,6 +184,13 @@ class MetadataPP(PostProcessor):
             for taglist in taglists:
                 extend(taglist)
             tags.sort()
+        elif all(isinstance(e, dict) for e in tags):
+            taglists = tags
+            tags = []
+            extend = tags.extend
+            for tagdict in taglists:
+                extend([x for x in tagdict.values() if x is not None])
+            tags.sort()
 
         fp.write("\n".join(tags) + "\n")
 

test/test_postprocessor.py

@@ -287,6 +287,18 @@ class MetadataTest(BasePostprocessorTest):
             self._trigger()
         self.assertEqual(self._output(m), "foobar1\nfoobar2\nfoobarbaz\n")
 
+    def test_metadata_tags_list_of_dict(self):
+        self._create(
+            {"mode": "tags"},
+            {"tags": [
+                {"g": "foobar1", "m": "foobar2"},
+                {"g": None, "m": "foobarbaz"}
+            ]},
+        )
+        with patch("builtins.open", mock_open()) as m:
+            self._trigger()
+        self.assertEqual(self._output(m), "foobar1\nfoobar2\nfoobarbaz\n")
+
     def test_metadata_custom(self):
         def test(pp_info):
             pp = self._create(pp_info, {"foo": "bar"})