less verbose output of keymap_switch

local function get_current_keymap()
    local fd = io.popen("setxkbmap -query")
    if not fd then return end

    for line in fd:lines() do
        if line:match("layout:") then
            local keymap = line:match("%s+.*")

            fd:close()
            if not keymap then
                return "unknown layout"
            else
                return keymap:gsub("%s", "")
            end
        end
    end

    fd:close()
    return "unknown layout"
end