Implement a better way to remeber the previously added taxonomy Rank

[jeanmanguy]

spideog/src/taxonomy.rs

Lines 9 to 10 in 1f8583a

	static LAST_TAXONOMY_RANK_PARSED: Lazy<Mutex<Option<TaxonomyRank>>> =
	Lazy::new(|| Mutex::new(None));

spideog/src/taxonomy.rs

Lines 47 to 62 in 1f8583a

	impl TaxonomyRank {
	pub fn plus_one(self) -> Self {
	match self {
	Self::Unclassified(i) => Self::Unclassified(i.checked_add(1).unwrap()),
	Self::Root(i) => Self::Root(i.checked_add(1).unwrap()),
	Self::Domain(i) => Self::Domain(i.checked_add(1).unwrap()),
	Self::Kingdom(i) => Self::Kingdom(i.checked_add(1).unwrap()),
	Self::Phylum(i) => Self::Phylum(i.checked_add(1).unwrap()),
	Self::Class(i) => Self::Class(i.checked_add(1).unwrap()),
	Self::Order(i) => Self::Order(i.checked_add(1).unwrap()),
	Self::Family(i) => Self::Family(i.checked_add(1).unwrap()),
	Self::Genus(i) => Self::Genus(i.checked_add(1).unwrap()),
	Self::Species(i) => Self::Species(i.checked_add(1).unwrap()),
	}
	}
	}

spideog/src/taxonomy.rs

Lines 103 to 110 in 1f8583a

	if let Some(previous_tax_rank) = *LAST_TAXONOMY_RANK_PARSED.lock().unwrap() {
	// TODO: there has to be a better way to do that, maybe without the mutex business
	Ok(previous_tax_rank.plus_one())
	} else {
	Err(ErrorKind::TaxRankParsingCannotInferRank(String::from(
	string,
	)))
	}