data-directory-use-xdg-data-home

Data directory: use $XDG_DATA_HOME

We prefer to have a user's data directory in a standard place:

• Use XDG_DATA_HOME environment variable if it's set.
• Otherwise use $HOME/.local/share.
• Append the program command, so the program uses its own subdirectory.

Code:

data_home() { out "${XDG_DATA_HOME:-$HOME/.local/share}" ; }; export -f data_home;
data_dir() { out $(data_home)"/$program_command" ; };

References:

• https://wiki.archlinux.org/index.php/XDG_Base_Directory_support

Purpose:

• Where user-specific data files should be written (analogous to /usr/share).
• Should default to $HOME/.local/share.