Make print_dir_tree expand ~

doc/whats_new.rst

@@ -68,6 +68,8 @@ Detailed list of changes
 
 - :func:`~mne_bids.copyfiles.copyfile_brainvision` can now deal with ``.dat`` file extension, by `Dominik Welke`_ (:gh:`1008`)
 
+- :func:`~mne_bids.print_dir_tree` now correctly expands ``~`` to the user's home directory, by `Richard Höchenberger`_ (:gh:`1013`)
+
 :doc:`Find out what was new in previous releases <whats_new_previous_releases>`
 
 .. include:: authors.rst

mne_bids/path.py

@@ -1174,9 +1174,13 @@ def print_dir_tree(folder, max_depth=None, return_str=False):
         If `return_str` is ``True``, the directory tree is returned as a
         string. Else, ``None`` is returned and the directory tree is printed.
     """
-    if not op.exists(folder):
-        raise ValueError('Directory does not exist: {}'.format(folder))
-
+    folder = _check_fname(
+        fname=folder,
+        overwrite='read',
+        must_exist=True,
+        name='Folder',
+        need_dir=True
+    )
     max_depth = _check_max_depth(max_depth)
 
     _validate_type(return_str, bool, 'return_str')