Please conform to XDG standard, instead of breaking it for everybody

[eddyp]

The XDG standard says user-specific data files should be written in $XDG_DATA_HOME which defaults to $HOME/.local/share.

Appdirs explicitly breaks XDG_DATA_HOME specification and returns a path based on $XDG_CONFIG_HOME, ~/.config/appname instead of ~/.local/share/appname for user_data_dir.

This is not at all "subject to some interpretation", this is as clear as day in the XDG spec:

http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

Quote:
There is a single base directory relative to which user-specific data files should be written. This directory is defined by the environment variable $XDG_DATA_HOME

and later:

$XDG_DATA_HOME defines the base directory relative to which user specific data files should be stored. If $XDG_DATA_HOME is either not set or empty, a default equal to $HOME/.local/share should be used.

No ifs or buts. It doesn't matter at all if some apps decide not to respect the standard, a library should do the right thing, not break standards for everybody 'just because'.

To fix this, commit 362f390 should be reverted.

[eddyp]

The commit 74cfeb8 fixes this issue.
There is also a linux-fixes branch in my fork that also undoes the broken mangling of the case on Linux. Linux is case sensitive and messing with the case behind user's back is not a wise idea.

[eddyp]

Fix also needs the comment correction provided by 0e398a0

[srid]

merged in master.