Add tests and implement org-tags-exclude-from-inheritance.

org_rw/org_rw.py

@@ -752,8 +752,13 @@ class Headline:
         return times
 
     @property
-    def tags(self):
+    def tags(self) -> list[str]:
-        return list(self.shallow_tags) + self.parent.tags
+        parent_tags = self.parent.tags
+        if self.doc.environment.get('org-tags-exclude-from-inheritance'):
+            for tag in self.doc.environment.get('org-tags-exclude-from-inheritance'):
+                if tag in parent_tags:
+                    parent_tags.remove(tag)
+        return list(self.shallow_tags) + parent_tags
 
     def add_tag(self, tag: str):
         self.shallow_tags.append(tag)
@@ -2234,6 +2239,7 @@ class OrgDoc:
     ):
         self.todo_keywords = [HeadlineState(name=kw) for kw in DEFAULT_TODO_KEYWORDS]
         self.done_keywords = [HeadlineState(name=kw) for kw in DEFAULT_DONE_KEYWORDS]
+        self.environment = environment
 
         keywords_set_in_file = False
         for keyword in keywords:

tests/test_org.py

@@ -906,6 +906,25 @@ class TestSerde(unittest.TestCase):
         h1_2_h2 = h1_2.children[0]
         self.assertEqual(sorted(h1_2_h2.shallow_tags), ['otherh2tag'])
 
+    def test_exclude_tags_from_inheritance_property_read_13(self):
+        with open(os.path.join(DIR, "13-tags.org")) as f:
+            orig = f.read()
+            doc = loads(orig, {
+                'org-tags-exclude-from-inheritance': ('h1tag', 'otherh2tag')
+            })
+
+        self.assertEqual(doc.tags, ['filetag'])
+
+        h1_1, h1_2 = doc.getTopHeadlines()
+        self.assertEqual(sorted(h1_1.tags), ['filetag', 'h1tag'])
+        self.assertEqual(sorted(h1_2.tags), ['filetag', 'otherh1tag'])
+
+        h1_1_h2 = h1_1.children[0]
+        self.assertEqual(sorted(h1_1_h2.tags), ['filetag', 'h2tag'])
+
+        h1_2_h2 = h1_2.children[0]
+        self.assertEqual(sorted(h1_2_h2.tags), ['filetag', 'otherh1tag', 'otherh2tag'])
+
 def print_tree(tree, indentation=0, headline=None):
     for element in tree:
         print(" " * indentation * 2, "EL:", element)