pub struct Commit {
    pub ty: String,
    pub scope: Option<String>,
    pub message: String,
}

impl Commit {
    pub fn build_message(&self) -> String {
        // This with_capacity is likely excessive
        const PARENS: usize = 2;
        const COLON: usize = 1;
        const SPACE: usize = 1;
        let len = self.ty.len()
            + self.message.len()
            + self.scope.as_ref().map(|s| s.len() + PARENS).unwrap_or(0)
            + COLON
            + SPACE;

        let mut s = String::with_capacity(len);

        s.push_str(&self.ty);

        if let Some(ref scope) = self.scope {
            s.push('(');
            s.push_str(scope);
            s.push(')');
        }

        s.push(':');
        s.push(' ');
        s.push_str(&self.message);

        s
    }
}