Menubar: Add navigation and execution keybindings.

This adds more navigation keybindings ('Home' and 'End'), which select
the first and the last entry from the list respectively. Also, it adds
two more keybindings:

    'Ctrl+Enter'        - Run the query (no need to press End and then
            Enter)

    'Ctrl+Alt+Enter'    - Run query in the terminal (sometimes there are
            terminal applications which one wants to run, e.g. ncmpcpp)

Signed-off-by: Ignas Anikevicius (gns_ank) <anikevicius@gmail.com>
Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/menubar/init.lua.in

@@ -14,6 +14,7 @@ local awful = require("awful")
 local common = require("awful.widget.common")
 local theme = require("beautiful")
 local menu_gen = require("menubar.menu_gen")
+local menu_utils = require("menubar.utils")
 local wibox = require("wibox")
 
 -- Standard lua
@@ -213,7 +214,21 @@ local function prompt_keypressed_callback(mod, key, comm)
             current_item = previous_item
             return true, nil, "Run app: "
         end
+    elseif key == "Home" then
+        current_item = 1
+        return true
+    elseif key == "End" then
+        current_item = #shownitems
+        return true
     elseif key == "Return" then
+        if mod.Control then
+            current_item = #shownitems
+            if mod.Mod1 then
+                -- add a terminal to the cmdline
+                shownitems[current_item].cmdline = menu_utils.terminal
+                        .. " -e " .. shownitems[current_item].cmdline
+            end
+        end
         return perform_action(shownitems[current_item])
     end
     return false