wibox.layout.*: add get direction method

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

lib/wibox/layout/align.lua.in

@@ -105,6 +105,7 @@ local function get_layout(dir)
     local ret = widget_base.make_widget()
     ret.draw = draw_dir
     ret.fit = function(box, ...) return ... end
+    ret.get_dir = function () return dir end
     ret._emit_updated = function()
         ret:emit_signal("widget::updated")
     end

lib/wibox/layout/fixed.lua.in

@@ -132,6 +132,7 @@ local function get_layout(dir)
     ret.reset = reset
     ret.fill_space = fill_space
     ret.widgets = {}
+    ret.get_dir = function () return dir end
     ret._emit_updated = function()
         ret:emit_signal("widget::updated")
     end

lib/wibox/layout/flex.lua.in

@@ -85,6 +85,7 @@ local function get_layout(dir)
     ret.add = add
     ret.reset = reset
     ret.widgets = {}
+    ret.get_dir = function () return dir end
     ret._emit_updated = function()
         ret:emit_signal("widget::updated")
     end