local tArgs = { ... }

local function printUsage()
    local programName = "clear"
    print("Usages:")
    print(programName)
    print(programName .. " screen")
    print(programName .. " palette")
    print(programName .. " all")
end

local function clear()
    term.clear()
    term.setCursorPos(1, 1)
end

local function clearPixels()
    if term.getGraphicsMode then
        term.setGraphicsMode(1)
        term.clear()
        term.setGraphicsMode(0)
    end
end

local function resetPalette()
    for i = 0, 15 do
        term.setPaletteColour(2^i, term.nativePaletteColour(2^i))
    end
end

local sCommand = tArgs[1] or "screen"
if sCommand == "screen" then
    clear()
elseif sCommand == "palette" then
    resetPalette()
elseif sCommand == "graphics" then
    clearPixels()
elseif sCommand == "all" then
    clear()
    clearPixels()
    resetPalette()
else
    printUsage()
end