bill 0.4.3

💸 A minimal library for creating invoices. Feel free to review and correct it.
Documentation 
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#![allow(dead_code, unused_variables)]
#[cfg(feature = "serialization")]
extern crate serde_json;

use bill::*;

fn c(value: i64) -> Currency {
    Currency::from(('€', value))
}

fn print_items(items: &[BillItem<Product<'_>>]) {
    //println!("{:?}", items);
    for item in items {
        println!(
            "   * {:3}x {:15} {:6} {:6}",
            item.amount,
            item.product.name,
            item.product.price.postfix(),
            item.gross().postfix()
        );
    }
}

fn print(title: &str, bill: &Bill<Product<'_>>) {
    println!("{}:", title);
    for (tax, items) in &bill.items_by_tax {
        println!("  {}%", tax);
        print_items(items);
    }
    println!("---------------------------------------");
    println!("       {}", bill.gross_total().postfix());
    println!("     + {} (tax)", bill.tax_total().postfix());
    println!("   net {}", bill.net_total().postfix());
    println!();
}

fn main() {
    let coffee = Product::new("Coffee", c(250), 0.19);
    let tee = Product::new("Tea", c(175), 0.19);
    let water = Product::new("Water", c(61), 0.19);
    let applejuice = Product::new("AppleJuice", c(164), 0.19);
    let orangejuice = Product::new("OrangeJuice", c(186), 0.19);
    let bagel = Product::new("Bagel", c(219), 0.19);
    let sandwich = Product::new("Sandwich", c(340), 0.19);
    let pie = Product::new("pie", c(94), 0.19);
    let soup = Product::new("Soup", c(310), 0.19);
    let service = Product::new("Service", c(800), 0.00);

    let mut offer = Bill::new();
    offer.add_item(8., water);
    offer.add_item(4., applejuice);
    offer.add_item(4., orangejuice);
    offer.add_item(40., sandwich);
    offer.add_item(2., service);

    let mut invoice = Bill::new();
    invoice.add_item(2., water);
    invoice.add_item(0., applejuice);
    invoice.add_item(2., orangejuice);
    invoice.add_item(50., sandwich);
    invoice.add_item(2.5, service);

    let mut invoice2 = Bill::new();
    invoice2.add_item(99.0, Product::new("Red Ballons", c(99), 0.19));

    #[cfg(not(feature = "serialization"))]
    {
        print("offer", &offer);
        print("invoice", &invoice);
        print("invoice2", &invoice2);
    }
    #[cfg(feature = "serialization")]
    {
        println!("{}", serde_json::to_string_pretty(&offer).unwrap());
        println!("{}", serde_json::to_string_pretty(&invoice).unwrap());
        println!("{}", serde_json::to_string_pretty(&invoice2).unwrap());
    }
}