awesome freezes

[Kasimir Knallkopf]

I'm trying to create my first widget for awesome. I've often have troubles 
remembering what's in what X11 buffer (PRIMARY, SECONDARY, and CLIPBOARD). Thus 
I wrote a little widget that shows me the contents. However, this widget seems 
to cause awesome to freeze after a couple of hours of use.


I instantiate it this way:
-- selection box
  cselp = widget({ type = "textbox"})
  vicious.register(cselp, clip, '<span color="yellow">Pri: </span> $1 ||', 1, 
"primary")

Any ideas?

Thanks.

-- {{{ Grab environment
local io = { popen = io.popen }
local math = { max = math.max }
local setmetatable = setmetatable
-- }}}

-- Pkg: provides number of pending updates on UNIX systems
module("clip")

-- {{{ Packages widget type
local function worker(format, warg)
    if not warg then return end

    -- Initialize counters
    local updates = 0
    local manager = {
        ["clipboard"] = { cmd = "xsel -b" },
        ["primary"]   = { cmd = "xsel -p" },
        ["secondary"] = { cmd = "xsel -s" },
    }

    -- get the output
    local pkg = manager[warg]
    local f = io.popen(pkg.cmd)
    local line = f:read()
    f:close()

    if line == nil then
       line = ""
    end

    return { line:gsub('<','&lt;') }
end
-- }}}

setmetatable(_M, { __call = function(_, ...) return worker(...) end })

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