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pathlib: improve comments on commonpath and bestrelpath

This commit is contained in:
Ran Benita 2020-09-29 13:11:47 +03:00
parent cd67c2a8cf
commit db08c7fbb0
1 changed files with 9 additions and 2 deletions
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11
src/_pytest/pathlib.py
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@ -581,7 +581,10 @@ def absolutepath(path: Union[Path, str]) -> Path:
def commonpath(path1: Path, path2: Path) -> Optional[Path]:
"""Return the common part shared with the other path, or None if there is
no common part."""
no common part.
If one path is relative and one is absolute, returns None.
"""
try:
return Path(os.path.commonpath((str(path1), str(path2))))
except ValueError:
@ -592,13 +595,17 @@ def bestrelpath(directory: Path, dest: Path) -> str:
"""Return a string which is a relative path from directory to dest such
that directory/bestrelpath == dest.
The paths must be either both absolute or both relative.
If no such path can be determined, returns dest.
"""
if dest == directory:
return os.curdir
# Find the longest common directory.
base = commonpath(directory, dest)
# Can be the case on Windows.
# Can be the case on Windows for two absolute paths on different drives.
# Can be the case for two relative paths without common prefix.
# Can be the case for a relative path and an absolute path.
if not base:
return str(dest)
reldirectory = directory.relative_to(base)