Consider supporting XDG Base Directory Specification?

[ChristianTacke]

The XDG Base Directory Specification has some rules for specifying where to search for a config file.

It basically means to search for config files in ${XDG_CONFIG_HOME} (or $HOME/.config it it's not set), and $XDG_CONFIG_DIRS (defaulting to /etc/xdg).

Usually, programs define a subdirectory for their config in those directories. For example ~/.config/git/.

I think, it would be nice, if ugrep would support this as well.

• Declutter my $HOME by moving .ugrep to .config/ugrep/config
• Allow a system wide (admin configurable) default config file: /etc/xdg/ugrep/config

If ugrep never ever will have more config files, one could also use ~/.config/ugrep.conf, and /etc/xdg/ugrep.conf.