Function option

pub fn option<T>(value: &Option<T>, default: &str) -> String
where
    T: ToString,

A function which is usefull in conjuntion with #[tabled(display)] and #[tabled(display)].

It can be used with any Option type. You must provide a second argument which represents a value be printed in case of None.

Example

use tabled::{Tabled, Table, derive::display};
use tabled::assert::assert_table;

#[derive(Tabled)]
#[tabled(display(Option, "display::option", "Unknown"))]
pub struct ZKP<'a> {
    application: &'a str,
    state: Option<&'a str>
}

let data = vec![
    ZKP { application: "Decentralized Identity", state: Some("Proved") },
    ZKP { application: "Voting Systems", state: Some("Investigation") },
    ZKP { application: "Privacy-Preserving Transactions", state: None },
];

let table = Table::new(data);

assert_table!(
    table,
    "+---------------------------------+---------------+"
    "| application                     | state         |"
    "+---------------------------------+---------------+"
    "| Decentralized Identity          | Proved        |"
    "+---------------------------------+---------------+"
    "| Voting Systems                  | Investigation |"
    "+---------------------------------+---------------+"
    "| Privacy-Preserving Transactions | Unknown       |"
    "+---------------------------------+---------------+"
);