kontochronik 0.2.0

Long-Term archive for account transactions
Documentation 
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use rust_decimal::Decimal;

// Deliberately no validation:
// the fingerprint must stay computable for whatever the bank delivered.
pub(crate) fn canonical_iban(s: &str) -> String {
    s.chars()
        .filter(|c| !c.is_whitespace())
        .map(|c| c.to_ascii_uppercase())
        .collect()
}

pub(crate) fn canonical_amount(amount: Decimal) -> String {
    let mut normalized = amount.round_dp(2);
    if normalized.is_zero() {
        normalized = Decimal::ZERO;
    }
    normalized.rescale(2);
    normalized.to_string()
}

pub(crate) fn canonical_text(s: &str) -> String {
    s.replace(['\r', '\n'], " ").trim().to_owned()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn zero_amount_is_canonicalized() {
        assert_eq!(canonical_amount(Decimal::ZERO), "0.00");
        assert_eq!(canonical_amount("-0.00".parse().unwrap()), "0.00");
        assert_eq!(canonical_amount(Decimal::new(-350, 2)), "-3.50");
    }
}