Fix exclude_paths regression

Fixes: #1311

src/ansiblelint/runner.py

@@ -80,7 +80,12 @@ def is_excluded(self, file_path: str) -> bool:
         # Any will short-circuit as soon as something returns True, but will
         # be poor performance for the case where the path under question is
         # not excluded.
-        return any(file_path.startswith(path) for path in self.exclude_paths)
+
+        # Exclusions should be evaluated only using absolute paths in order
+        # to work correctly.
+        abs_path = os.path.abspath(file_path)
+
+        return any(abs_path.startswith(path) for path in self.exclude_paths)
 
     def run(self) -> List[MatchError]:
         """Execute the linting process."""
@@ -137,6 +142,11 @@ def worker(lintable: Lintable) -> List[MatchError]:
         # update list of checked files
         self.checked_files.update([str(x.path) for x in self.lintables])
 
+        # remove any matches made inside excluded files
+        matches = list(
+            filter(lambda match: not self.is_excluded(match.filename), matches)
+        )
+
         return sorted(set(matches))
 
     def _emit_matches(self, files: List[Lintable]) -> Generator[MatchError, None, None]:

test/TestRunner.py

@@ -57,6 +57,18 @@ def test_runner(default_rules_collection, playbook, exclude, length) -> None:
     assert len(matches) == length
 
 
+def test_runner_exclude_paths(default_rules_collection) -> None:
+    """Test that exclude paths do work."""
+    runner = Runner(
+        'examples/playbooks/example.yml',
+        rules=default_rules_collection,
+        exclude_paths=['examples/'],
+    )
+
+    matches = runner.run()
+    assert len(matches) == 0
+
+
 @pytest.mark.parametrize(
     ('formatter_cls'),
     (