`MacOS.site_data_path` returns `:` separated path under Homebrew with multipath

[matthewhughes934]

Hi, I was wondering about this behaviour as I noticed there is a difference between how MacOS and Linux handle this property:

• For Unix this property uses the first element if site_data_dir is a : separated multipath
• For MacOS this property uses the entire value of site_data_dir, even if this results in a Path containing a :

This came from: https://github.com/pypa/pip/issues/12903.

Note: the same behaviour exists for site_cache_dir

demonstration:

import os

from platformdirs import macos, unix

# hack to pretend we're under homebrew
macos.sys.prefix = "/opt/homebrew/"
print(macos.MacOS(multipath=True).site_data_dir)
print(macos.MacOS(multipath=True).site_data_path)

# force site_data_dir to be a multipath
os.environ["XDG_DATA_DIRS"] = "/foo:/bar"
print(unix.Unix(multipath=True).site_data_dir)
print(unix.Unix(multipath=True).site_data_path)

Output:

/opt/homebrew/share:/Library/Application Support
/opt/homebrew/share:/Library/Application Support
/foo:/bar
/foo

Should MacOS also just use the first element, so in the above: macos.MacOS(multipath=True).site_data_path == Path(/opt/homebrew/share)

[gaborbernat]

PR welcome with such change 👍

[matthewhughes934]

PR welcome with such change 👍

Thanks, I've created https://github.com/tox-dev/platformdirs/pull/299