refactor theme check

[stevensonmt]

@VuiMuich, what do you think of this approach? I haven't tested it to see if the xdg::BaseDirectories::find_config_files() works the way I think it does, but it seems like it should.

[VuiMuich]

Hey, thanks for the refactor! This is way better than my code was!

I believe though fn missing_expected_file might be broken, as I get an error File: 'up' not found., but my test directory is missing a theme.toml and permissions for the scripts but up and down are definitely there..

Might find some time for this at some point this weekend I guess.

[stevensonmt]

So the find_config_files method is not working the way I thought. The iterator is just a single item with the config path ending in "current" rather than returning an iterator over the files in that directory. It looks like xdg::BaseDirectories::list_config_files is what I needed instead. Check most recent commit to see if it works for you. Worked for me.
BTW, feel free to remove the test I added. It's only valid if you know you have a valid theme applied.