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//! Demonstrates the creation and registration of a custom plugin.
//! Plugins are the foundation of Bevy. They are scoped sets of components, resources, and systems
//! that provide a specific piece of functionality (generally the smaller the scope, the better).
//! This example illustrates how to create a simple plugin that prints out a message.

use bevy::{prelude::*, utils::Duration};

fn main() {
        // plugins are registered as part of the "app building" process
            PrintMessagePlugin {
                wait_duration: Duration::from_secs(1),
                message: "This is an example plugin".to_string(),

// This "print message plugin" prints a `message` every `wait_duration`
struct PrintMessagePlugin {
    // Put your plugin configuration here
    wait_duration: Duration,
    message: String,

impl Plugin for PrintMessagePlugin {
    // this is where we set up our plugin
    fn build(&self, app: &mut App) {
        let state = PrintMessageState {
            message: self.message.clone(),
            timer: Timer::new(self.wait_duration, TimerMode::Repeating),
            .add_systems(Update, print_message_system);

struct PrintMessageState {
    message: String,
    timer: Timer,

fn print_message_system(mut state: ResMut<PrintMessageState>, time: Res<Time>) {
    if state.timer.tick( {
        info!("{}", state.message);