Match deleted lines for dirs matching.

Author: ehuss

highfive/newpr.py

@@ -304,7 +304,8 @@ def choose_reviewer(self, repo, owner, diff, exclude):
                     ]
                     continue
 
-                if (not line.startswith('+++')) and line.startswith('+'):
+                if ((not line.startswith('+++')) and line.startswith('+')) or \
+                   ((not line.startswith('---')) and line.startswith('-')):
                     for path in longest_dir_paths:
                         counts[path] = counts.get(path, 0) + 1
 

highfive/tests/test_newpr.py

@@ -1350,6 +1350,15 @@ def test_prefixed_dirs(self):
         (chosen_reviewers, _) = self.choose_reviewers(diff, 'ehuss')
         assert set(['parser']) == chosen_reviewers
 
+    def test_deleted_file(self):
+        """Test dirs matching for a deleted file."""
+        self.handler = HighfiveHandlerMock(
+            Payload({}), repo_config=self.fakes['config']['prefixed-dirs']
+        ).handler
+        diff = fakes.make_fake_diff([('compiler/rustc_parse/src/foo.rs', 0, 10)])
+        (chosen_reviewers, _) = self.choose_reviewers(diff, 'ehuss')
+        assert set(['parser']) == chosen_reviewers
+
 
 class TestRun(TestNewPR):
     @pytest.fixture(autouse=True)