List empty dirs in gl status

So users can track them if they wish.

Author: embs

gitless/core.py

@@ -771,6 +771,14 @@ def status(self):
         yield self.FileStatus(
             fp, GL_STATUS_UNTRACKED, True, exists_in_wd, True, False)
 
+    # find untracked empty dirs
+    for dirpath, dirs, files in os.walk('.', topdown=True):
+      dirs[:] = [d for d in dirs if d not in ['.git'] and not
+          self.path_is_ignored(d)]
+      if not dirs and not files:
+        yield self.FileStatus(dirpath, GL_STATUS_UNTRACKED, False, True, False,
+            False)
+
   def status_file(self, path):
     """Return the status (see FileStatus) of the given path."""
     return self._status_file(path)[0]

gitless/tests/test_e2e.py

@@ -65,6 +65,27 @@ def assert_not_in_repo(*cmds):
 
 class TestTrackEmptyDir(TestEndToEnd):
 
+  def test_empty_dir_status(self):
+    dir_to_track = 'wanted_empty_dir'
+    dir_to_track_path = os.path.join(self.path, dir_to_track)
+    os.mkdir(dir_to_track_path)
+
+    out = utils.stdout(gl.status())
+
+    self.assertIn(dir_to_track, out, 'Empty dir didn\'t appear in status')
+
+  def test_ignored_empty_dir_status(self):
+    gitignore = os.path.join(self.path, '.gitignore')
+    ignored_empty_dir = 'ignored_empty_dir'
+    ignored_empty_dir_path = os.path.join(self.path, ignored_empty_dir)
+    os.mkdir(ignored_empty_dir_path)
+    utils.write_file(gitignore, ignored_empty_dir)
+
+    out = utils.stdout(gl.status())
+
+    self.assertFalse(ignored_empty_dir in out, 'Ignored empty dir was listed in' +
+        ' status')
+
   def test_tracked_empty_dir(self):
     dir_to_track = 'wanted_empty_dir'
     dir_to_track_path = os.path.join(self.path, dir_to_track)