Bevy Book: Plugins

hello-world/src/main.rs

@@ -1,36 +1,14 @@
 use bevy::prelude::*;
 
+mod people;
+
 fn main() {
     App::new()
-        .add_systems(Startup, add_people)
-        .add_systems(Update, (hello_world, greet_people))
+        .add_plugins((DefaultPlugins, people::Plugin))
+        .add_systems(Startup, hello_world)
         .run();
 }
 
-#[derive(Component)]
-struct Person;
-
-#[derive(Component)]
-struct Name(String);
-
-impl Name {
-    fn new<S: Into<String>>(name: S) -> Self {
-        Self(name.into())
-    }
-}
-
-fn add_people(mut cmds: Commands) {
-    cmds.spawn((Person, Name::new("Elaina Proctor")));
-    cmds.spawn((Person, Name::new("Renzo Hume")));
-    cmds.spawn((Person, Name::new("Zayna Nieves")));
-}
-
 fn hello_world() {
     println!("Hello, world!");
 }
-
-fn greet_people(q: Query<&Name, With<Person>>) {
-    for name in &q {
-        println!("Hello, {}!", name.0);
-    }
-}

hello-world/src/people.rs

@@ -0,0 +1,38 @@
+use bevy::{
+    app::{Startup, Update},
+    prelude::{App, Commands, Component, Query, With},
+};
+
+pub struct Plugin;
+
+impl bevy::app::Plugin for Plugin {
+    fn build(&self, app: &mut App) {
+        #[rustfmt::skip]
+        app.add_systems(Startup, startup)
+            .add_systems(Update, greet);
+    }
+}
+
+#[derive(Component)]
+struct Person;
+
+#[derive(Component)]
+struct Name(String);
+
+impl Name {
+    fn new<S: Into<String>>(name: S) -> Self {
+        Self(name.into())
+    }
+}
+
+fn startup(mut cmds: Commands) {
+    cmds.spawn((Person, Name::new("Elaina Proctor")));
+    cmds.spawn((Person, Name::new("Renzo Hume")));
+    cmds.spawn((Person, Name::new("Zayna Nieves")));
+}
+
+fn greet(q: Query<&Name, With<Person>>) {
+    for name in &q {
+        println!("Hello, {}!", name.0);
+    }
+}