swdir 0.8.4

Swiftly traverse and scan directories recursively. Sway 🪭, swing 🎷 or swim 🪼 in directories.
Documentation 
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use crate::helpers::error::SwdirError;

/// validate:
/// - extension items in allowlist / denylist don't start with period
/// - both allowlist / denylist are specified
pub fn validate_list_extensions(
    list: &Vec<String>,
    reference: Option<&Vec<String>>,
) -> Result<(), SwdirError> {
    for x in list {
        if x.starts_with(".") {
            return Err(SwdirError::InvalidExtensionListItem(x.to_owned()));
        }
    }
    if reference.is_some() {
        return Err(SwdirError::DuplicateExtensionList);
    }
    Ok(())
}