tidy check for vim and emacs modelines.

See https://github.com/servo/servo/issues/10719.

2 files changed, 13 insertions, 0 deletions

diff --git a/python/tidy/servo_tidy_tests/modeline.txt b/python/tidy/servo_tidy_tests/modeline.txt
new file mode 100644
index 00000000000..2a3416953ce
--- /dev/null
+++ b/python/tidy/servo_tidy_tests/modeline.txt
@@ -0,0 +1,5 @@
+# vim: set noexpandtab:
+// vi: et:
+/* ex: et:
+anything -*-Lisp-*-
+ -*- mode: Lisp -*-
diff --git a/python/tidy/servo_tidy_tests/test_tidy.py b/python/tidy/servo_tidy_tests/test_tidy.py
index 031e0873a56..1c26ba17b3b 100644
--- a/python/tidy/servo_tidy_tests/test_tidy.py
+++ b/python/tidy/servo_tidy_tests/test_tidy.py
@@ -75,6 +75,14 @@ class CheckTidiness(unittest.TestCase):
         errors = tidy.collect_errors_for_files(iterFile('test.toml'), [tidy.check_toml], [])
         self.assertEqual('found asterisk instead of minimum version number', errors.next()[2])
 
+    def test_modeline(self):
+        errors = tidy.collect_errors_for_files(iterFile('modeline.txt'), [], [tidy.check_modeline])
+        self.assertEqual('vi modeline present', errors.next()[2])
+        self.assertEqual('vi modeline present', errors.next()[2])
+        self.assertEqual('vi modeline present', errors.next()[2])
+        self.assertEqual('emacs file variables present', errors.next()[2])
+        self.assertEqual('emacs file variables present', errors.next()[2])
+
 
 def do_tests():
     suite = unittest.TestLoader().loadTestsFromTestCase(CheckTidiness)