fixes #151

Author: jph00

fastcore/_nbdev.py

@@ -101,6 +101,7 @@
          "patch_to": "02_foundation.ipynb",
          "patch": "02_foundation.ipynb",
          "patch_property": "02_foundation.ipynb",
+         "working_directory": "02_foundation.ipynb",
          "add_docs": "02_foundation.ipynb",
          "docs": "02_foundation.ipynb",
          "custom_dir": "02_foundation.ipynb",

fastcore/foundation.py

@@ -1,8 +1,8 @@
 # AUTOGENERATED! DO NOT EDIT! File to edit: nbs/02_foundation.ipynb (unless otherwise specified).
 
-__all__ = ['copy_func', 'patch_to', 'patch', 'patch_property', 'add_docs', 'docs', 'custom_dir', 'coll_repr', 'is_bool',
-           'mask2idxs', 'cycle', 'zip_cycle', 'is_indexer', 'GetAttr', 'delegate_attr', 'CollBase', 'L',
-           'save_config_file', 'read_config_file', 'Config']
+__all__ = ['copy_func', 'patch_to', 'patch', 'patch_property', 'working_directory', 'add_docs', 'docs', 'custom_dir',
+           'coll_repr', 'is_bool', 'mask2idxs', 'cycle', 'zip_cycle', 'is_indexer', 'GetAttr', 'delegate_attr',
+           'CollBase', 'L', 'save_config_file', 'read_config_file', 'Config']
 
 # Cell
 from .imports import *
@@ -53,6 +53,15 @@ def patch_property(f):
     cls = next(iter(f.__annotations__.values()))
     return patch_to(cls, as_prop=True)(f)
 
+# Cell
+@contextmanager
+def working_directory(path):
+    "Change working directory to `path` and return to previous on exit."
+    prev_cwd = Path.cwd()
+    os.chdir(path)
+    try: yield
+    finally: os.chdir(prev_cwd)
+
 # Cell
 def add_docs(cls, cls_doc=None, **docs):
     "Copy values from `docs` to `cls` docstrings, and confirm all public methods are documented"