mpc: Make a reconnect happen

Without this, the connection might "almost never" be reestablished.

Signed-off-by: Uli Schlachter <psychon@znc.in>

recipes/mpc.mdwn

@@ -39,6 +39,7 @@ updates when the current MPD state changes.
 
     local mpc = require("mpc")
     local textbox = require("wibox.widget.textbox")
+    local timer = require("gears.timer")
     local mpd_widget = textbox()
     local state, title, artist, file = "stop", "", "", ""
     local function update_widget()
@@ -52,10 +53,15 @@ updates when the current MPD state changes.
         end
         mpd_widget.text = text
     end
+    local connection
     local function error_handler(err)
         mpd_widget:set_text("Error: " .. tostring(err))
+        -- Try a reconnect soon-ish
+        timer.start_new(10, function()
+            connection:send("ping")
+        end)
     end
-    local connection = mpc.new(nil, nil, nil, error_handler,
+    connection = mpc.new(nil, nil, nil, error_handler,
         "status", function(_, result)
             state = result.state
         end,