-- Title: Cloud Shadow Toggle Shift+X

function togglecloudshadows()
    local enabled = celestia:getrenderflags().cloudshadows
    local s
    if enabled then s = "off" else s = "on" end
    celestia:flash("Cloud shadows: " .. s)
    local t = {}
    t.cloudshadows = not enabled
    celestia:setrenderflags(t)
end

-- The table mapping key names to handlers
keyhandlers =
{
    X = togglecloudshadows,
}

function handlekey(k)
    -- k is a table containing the event properties; in this simple sample,
    -- we're only interested in char, the name of the key that was pressed.
    handler = keyhandlers[k.char]
    if (handler ~= nil) then
        handler()
        return true
    else
        return false
    end
end 

celestia:registereventhandler("key", handlekey)