bevy 0.5.0

A refreshingly simple data-driven game engine and app framework
Documentation 
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use bevy::prelude::*;

fn main() {
    App::build()
        .add_plugins(DefaultPlugins)
        .add_system(mouse_click_system.system())
        .run();
}

// This system prints messages when you press or release the left mouse button:
fn mouse_click_system(mouse_button_input: Res<Input<MouseButton>>) {
    if mouse_button_input.pressed(MouseButton::Left) {
        println!("left mouse currently pressed");
    }

    if mouse_button_input.just_pressed(MouseButton::Left) {
        println!("left mouse just pressed");
    }

    if mouse_button_input.just_released(MouseButton::Left) {
        println!("left mouse just released");
    }
}