awesome-notification-property-changes.lua

-- Notifications for property changes (number of masters, master width factor). {{{
-- local prev_tag_vals = {['property::nmaster']={}, ['property::mwfact']={}}
local prev_tag_vals, prop_notification_id = {}, nil
for s = 1, capi.screen.count() do
  for sig, name in pairs({['property::nmaster']    = 'nmaster',
                          ['property::ncol']       = 'ncol',
                          ['property::windowfact'] = 'windowfact',
                          ['property::mwfact']     = 'mwfact'}) do
    awful.tag.attached_connect_signal(s, sig, function(t)
      if not prev_tag_vals[sig] then
        prev_tag_vals[sig] = { [t] = '?' }
      elseif not prev_tag_vals[sig][t] then
        prev_tag_vals[sig][t] = '?'
      end
      local old = prev_tag_vals[sig][t]
      local val = awful.tag.getproperty(t, name)
      prop_notification_id = naughty.notify({
          text = name .. ' changed: ' .. tostring(old) .. ' => ' .. tostring(val),
          timeout = 10,
          replaces_id = prop_notification_id,
        }).id
      prev_tag_vals[sig][t] = val
    end)
  end
end