Interface System program sketch

-- CONCEPT/SKETCH, NOT FINAL
local handles = {} -- Interface System applications are formatted as tables, like almost everything in lua.

handles.intsys = true -- This is indeed an Interface System program. This might not actually be very useful.
handles.sysver = 0    -- Intended system version, fails if it's higher.

local window = nil

local bananaText = "Banana"
local function onBanana() bananaText = "No more banana" end
local function getBananaText() return bananaText end

-- Main function, this is executed as a coroutine. Instead of using os.sleep, you will do coroutine.yield
function handles.main()

    window = intsys.makeWindow() -- Creates the window with all of its preset functions.
    window.title = "Hello Mario." -- if nil then the window is drawn with no title.

    -- Enables/disables the button on the titlebar.
    window.canClose = true
    window.canResize = true

    window.setSize(100, 100)

    -- window.add will add a control to the list of controls for the window.
    -- A control is a table of.. functions and stuff.
    -- If formatted correctly, you can make your own!

    -- A generic persistant text control, that just draws text on redraw.
    window.add(window.makeText(5, 5, "Hello Luigi."))
    -- Buttons take a function reference to execute, if not nil.
    window.add(window.makeButton(5, 20, "Banana", onBanana))

    -- These controls can use functions to get their text from as well.
    -- This marks it as an "active" control. When windows redraw, the function is ran.
    window.add(window.makeText(5, 30, getBananaText))
    -- If you wanted the button to change its text for example
    --window.add(window.makeButton(5, 20, getBananaText, onBanana))

    -- These controls most likely lack features that will be present later on.
    -- It is possible there will be handles to the window such as "update" and "redraw".

    -- Adds the window to the internal list, so it is updated and redrawn, etc. Marks "exists" as true.
    intsys.registerWindow(window)

    -- Infinite looping program, this is usually how you would do your update logic.
    -- window.exists returns false if the window no longer is registered. You can probably re-register it if you wanted to.
    -- After the coroutine is no longer valid, Interface System will automatically de-list the program.
    while window.exists do
        coroutine.yield()
    end
    -- De-init down here if necessary.
end

return handles -- Returns the program's handles back to Interface System.