irc: add Disconnect in server actions; rename Connect->Open when session already active

Signed-off-by: Slendi <slendi@socopon.com>

main.lua

@@ -861,13 +861,29 @@ function IRC:getServerListItems()
 end
 
 function IRC:getServerActions(server, index)
+    local function isConnected()
+        return self._bg_view and self._bg_view._sock and self._bg_view._server
+            and self._bg_view._server.host == server.host
+            and tostring(self._bg_view._server.port or 6667) == tostring(server.port or 6667)
+    end
     local actions = {
         {
-            text = _("Connect"),
+            text_func = function()
+                return isConnected() and _("Open") or _("Connect")
+            end,
             callback = function()
                 self:connectToServer(server)
             end,
         },
+        {
+            text = _("Disconnect"),
+            enabled_func = function() return isConnected() end,
+            callback = function()
+                if self._bg_view and self._bg_view.disconnect then
+                    self._bg_view:disconnect()
+                end
+            end,
+        },
         {
             text = _("Edit"),
             callback = function()