Support XDG

[baest]

Implements #202. Missing tests or doc changes. I can contribute those.

[garu]

Hey @baest! Thank you using Data-Printer and for the thoughtful and relevant patch! I have only a few simple requests before merging:

1. Could you please update the code so it looks for XDG_CONFIG_HOME before the user's home dir? My understanding is that XDG_CONFIG_HOME should take priority when it comes to finding config files.
2. To avoid ambiguity and confusion, could you please keep the original .dataprinter name? I know it makes little sense inside XDG, but I want people to be able to mv it around without worrying about name changes. So the full path would be File::Spec->catfile($ENV{XDG_CONFIG_HOME}, 'dataprinter', '.dataprinter');
3. Tests and documentation are most welcome. In particular, tests should be under t/017-rc_file.t but it's ok if you rather delegate them to me, just let me know.
4. Please add yourself to the "CONTRIBUTOR"s list!

Cheers!

[baest]

Hi @garu Thanks for the quick reply!

1. Yes of course. That was actually what I wanted originally but thought that this would be more easily accepted.
2. Sure I can do that. I just want to note that this is against normal standard. https://wiki.archlinux.org/title/XDG_Base_Directory#Supported list a bunch of supported applications and none of them it seems use dot file notation inside XDG. That said, I see your argument and just want to raise this note.
3. I will give it a stab, did find 017-rc_file.t before sending the PR, but doing the test was a bit more involved than what time allowed originally.
4. Sure ;-)

Thanks!