Support for filtering out subtree(s) when calculating stats

[ricab]

Just want to suggest an addition to this very nice project. I would find it useful if onefetch had an option to filter out directories and/or files when calculating stats like Languages, LoC and Size.

I find that current results are quite skewed for projects that include many submodules or other code dependencies. An exclusion pattern would allow ignoring things like third-party code, documentation, examples, etc. I imagine something like --exclude <pattern>.

Alternatively (or additionally), there could be an option to discount git submodules. That would be easier to use, but less general.

[o2sh]

Yes, the --exclude <pattern> flag would be a nice addition to the tool. tokei (used by onefetch to retrieve language statistics) already has this feature. So we "just" need to use it (from lib.rs):

// Exclude any path that contains any of these strings.
let excluded = &["target"];
let config = Config::default();
let mut languages = Languages::new();
languages.get_statistics(paths, excluded, &config);
let rust = &languages[&LanguageType::Rust];

Doing so, Languages and LoC sections will be updated based on the flag's input. However the Size will remain unchanged as it relies on a git command and not tokei.

[o2sh]

XAMPPRocky/tokei#564