al-skel/home/.config/awesome/vicious/widgets/pkg.lua

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-- Licensed under the GNU General Public License v2
--  * (c) 2010, Adrian C. <anrxc@sysphere.org>
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-- {{{ Grab environment
local io = { popen = io.popen }
local math = { max = math.max }
local setmetatable = setmetatable
-- }}}


-- Pkg: provides number of pending updates on UNIX systems
-- vicious.widgets.pkg
local pkg = {}


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

  -- Initialize counters
  local updates = 0
  local manager = {
    ["Arch"]   = { cmd = "pacman -Qu" },
    ["Arch C"] = { cmd = "checkupdates" },
    ["Arch S"] = { cmd = "yes | pacman -Sup", sub = 1 },
    ["Debian"] = { cmd = "apt-show-versions -u -b" },
    ["Ubuntu"] = { cmd = "aptitude search '~U'" },
    ["Fedora"] = { cmd = "yum list updates", sub = 3 },
    ["FreeBSD"] ={ cmd = "pkg_version -I -l '<'" },
    ["Mandriva"]={ cmd = "urpmq --auto-select" }
  }

  -- Check if updates are available
  local _pkg = manager[warg]
  local f = io.popen(_pkg.cmd)

  for line in f:lines() do
    updates = updates + 1
  end
  f:close()

  return {_pkg.sub and math.max(updates-_pkg.sub, 0) or updates}
end
-- }}}

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