use sdl2::mouse::MouseButton;

fn is_a_pressed(e: &sdl2::EventPump) -> bool {
    e.mouse_state().left()
}

use sdl2::mouse::MouseButton;

fn is_left_pressed(e: &sdl2::EventPump) -> bool {
    e.mouse_state().is_mouse_button_pressed(MouseButton::Left)
}

use sdl2::mouse::MouseButton;
use std::collections::HashMap;

fn mouse_button_set(e: &sdl2::EventPump) -> HashMap<MouseButton, bool> {
    e.mouse_state().mouse_buttons().collect()
}

fn find_first_pressed(e: &sdl2::EventPump) -> bool {
    for (key,value) in mouse_button_set(e) {
        return value != false
    }
    false
}

use sdl2::mouse::MouseButton;
use std::collections::HashSet;

fn pressed_mouse_button_set(e: &sdl2::EventPump) -> HashSet<MouseButton> {
    e.mouse_state().pressed_mouse_buttons().collect()
}

fn newly_pressed(old: &HashSet<MouseButton>, new: &HashSet<MouseButton>) -> HashSet<MouseButton> {
    new - old
    // sugar for: new.difference(old).collect()
}