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//! This example demonstrates using the [attribute macro](https://doc.rust-lang.org/reference/procedural-macros.html#attribute-macros)
//! [`display_with`] to seamlessly augment field representations in a [`Table`] display.
//!
//! * [`display_with`] functions act as transformers during [`Table`] instantiation.
//!
//! * Note how [`display_with`] works with [std] and custom functions alike.
//!
//! * [`display_with`] attributes can be constructed in two ways (shown below).
//!
//! * Attribute arguments can be directly overridden with static values, effectively ignoring the
//! augmented fields natural value entirely. Even an entire object can be passed as context with `self`.
use std::borrow::Cow;
use tabled::{Table, Tabled};
#[derive(Tabled)]
#[tabled(rename_all = "camelCase")]
struct Country {
name: &'static str,
capital_city: &'static str,
#[tabled(display_with("display_perimeter", self))]
surface_area_km2: f32,
#[tabled(display_with = "str::to_lowercase")]
national_currency: &'static str,
national_currency_short: &'static str,
}
fn display_perimeter(country: &Country) -> Cow<'_, str> {
if country.surface_area_km2 > 1_000_000.0 {
"Very Big Land".into()
} else {
"Big Land".into()
}
}
impl Country {
fn new(
name: &'static str,
national_currency: &'static str,
national_currency_short: &'static str,
capital_city: &'static str,
surface_area_km2: f32,
) -> Self {
Self {
name,
national_currency,
national_currency_short,
capital_city,
surface_area_km2,
}
}
}
fn main() {
let data = [
Country::new("Afghanistan", "Afghani", "AFN", "Kabul", 652867.0),
Country::new("Angola", "Kwanza", "AOA", "Luanda", 1246700.0),
Country::new("Canada", "Canadian Dollar", "CAD", "Ottawa", 9984670.0),
];
let table = Table::new(data);
println!("{table}");
}
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