bevy_diagnostic 0.9.0

Provides diagnostic functionality for Bevy Engine
Documentation 
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use bevy_app::{App, Plugin};
use bevy_ecs::{entity::Entities, system::ResMut};

use crate::{Diagnostic, DiagnosticId, Diagnostics};

/// Adds "entity count" diagnostic to an App
#[derive(Default)]
pub struct EntityCountDiagnosticsPlugin;

impl Plugin for EntityCountDiagnosticsPlugin {
    fn build(&self, app: &mut App) {
        app.add_startup_system(Self::setup_system)
            .add_system(Self::diagnostic_system);
    }
}

impl EntityCountDiagnosticsPlugin {
    pub const ENTITY_COUNT: DiagnosticId =
        DiagnosticId::from_u128(187513512115068938494459732780662867798);

    pub fn setup_system(mut diagnostics: ResMut<Diagnostics>) {
        diagnostics.add(Diagnostic::new(Self::ENTITY_COUNT, "entity_count", 20));
    }

    pub fn diagnostic_system(mut diagnostics: ResMut<Diagnostics>, entities: &Entities) {
        diagnostics.add_measurement(Self::ENTITY_COUNT, || entities.len() as f64);
    }
}