src/login/validate.rs


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use unicode_segmentation::UnicodeSegmentation as _;

use crate::name::Name;

// Picked out of a hat. The power of two is not meaningful.
const NAME_TOO_LONG: usize = 64;

pub fn name(name: &Name) -> bool {
    let display = name.display();

    [
        display.graphemes(true).count() < NAME_TOO_LONG,
        display.chars().all(|ch| !ch.is_control()),
        display.chars().next().is_some_and(char::is_alphanumeric),
        display.chars().last().is_some_and(char::is_alphanumeric),
        display
            .chars()
            .zip(display.chars().skip(1))
            .all(|(a, b)| !(a.is_whitespace() && b.is_whitespace())),
    ]
    .into_iter()
    .all(|value| value)
}