Add check_path function

hansel/check.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:
+"""
+Helper functions to check crumbs or paths.
+"""
+
+from .crumb import Crumb
+
+
+def check_path(path):
+    """ Return a Crumb if `path` has crumb arguments, a str otherwise.
+
+    Parameters
+    ----------
+    path: str
+
+    Returns
+    -------
+    path: str or Crumb
+    """
+    if Crumb.has_crumbs(path):
+        return Crumb(path)
+    else:
+        return path
+

hansel/tests/test_check.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:
+
+
+from six import string_types
+from hansel.check import check_path
+from hansel.crumb import Crumb
+
+
+def test_check():
+
+    assert isinstance(check_path('/home/hansel/{files}'), Crumb)
+
+    assert isinstance(check_path('/home/hansel'), string_types)