LÖVE

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io.stdout:setvbuf('no')


local bit = require('bit')
local band = bit.band

local ffi = require('ffi')
-- Based on:
-- https://github.com/torch/sdl2-ffi/blob/master/cdefs.lua#L1407-L1432
ffi.cdef([[
// Using 'unsigned int' instead of "SDL_Keymod" for brevity.
unsigned int SDL_GetModState(void);
]])

-- Based on:
-- https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_keycode.h#L332
local SDL_Keymod = {
    KMOD_NONE = 0x0000,
    KMOD_LSHIFT = 0x0001,
    KMOD_RSHIFT = 0x0002,
    KMOD_LCTRL = 0x0040,
    KMOD_RCTRL = 0x0080,
    KMOD_LALT = 0x0100,
    KMOD_RALT = 0x0200,
    KMOD_LGUI = 0x0400,
    KMOD_RGUI = 0x0800,
    KMOD_NUM = 0x1000,
    KMOD_CAPS = 0x2000,
    KMOD_MODE = 0x4000,
    KMOD_SCROLL = 0x8000,
    
    KMOD_CTRL = 0x0040 + 0x0080,
    KMOD_SHIFT = 0x0001 + 0x0002,
    KMOD_ALT = 0x0100 + 0x0200,
    KMOD_GUI = 0x0400 + 0x0800,

    KMOD_RESERVED = 0x8000
}

-- Cross-platform SDL reference from here:
-- https://love2d.org/forums/viewtopic.php?p=252728#p252728
local SDL = (ffi.os == "Windows" and ffi.load("SDL2") or ffi.C)
local SDL_GetModState = SDL.SDL_GetModState


function love.keyboard.isModifierActive(key)
    if key == 'capslock' then
        return band(SDL_GetModState(), SDL_Keymod.KMOD_CAPS) ~= 0
    elseif key == 'numlock' then
        return band(SDL_GetModState(), SDL_Keymod.KMOD_NUM) ~= 0
    elseif key == 'scrolllock' then
        return band(SDL_GetModState(), SDL_Keymod.KMOD_SCROLL) ~= 0
    elseif key == 'mode' then
        return band(SDL_GetModState(), SDL_Keymod.KMOD_MODE) ~= 0
    end
    return false
end


print('The program started with:')
print()
print('Capslock:', love.keyboard.isModifierActive('capslock'))
print('NumLock:', love.keyboard.isModifierActive('numlock'))
print('ScrollLock:', love.keyboard.isModifierActive('scrolllock'))
print('Mode:   ', love.keyboard.isModifierActive('mode'))


function love.keypressed()
    love.event.quit()
end


function love.draw()
    love.graphics.print('Look in the system console.', 10, 10)
    love.graphics.print('Press any key to quit.', 10, 30)
end