class: Share the module level signal system implementation.

Avoid adding another copy.

lib/gears/object.lua

@@ -134,6 +134,42 @@ function object:emit_signal(name, ...)
     end
 end
 
+function object._setup_class_signals(t)
+    local conns = {}
+
+    function t.connect_signal(name, func)
+        assert(name)
+        conns[name] = conns[name] or {}
+        table.insert(conns[name], func)
+    end
+
+    --- Emit a notification signal.
+    -- @tparam string name The signal name.
+    -- @param ... The signal callback arguments
+    function t.emit_signal(name, ...)
+        assert(name)
+        for _, func in pairs(conns[name] or {}) do
+            func(...)
+        end
+    end
+
+    --- Disconnect a signal from a source.
+    -- @tparam string name The name of the signal
+    -- @tparam function func The attached function
+    -- @treturn boolean If the disconnection was successful
+    function t.disconnect_signal(name, func)
+        for k, v in ipairs(conns[name] or {}) do
+            if v == func then
+                table.remove(conns[name], k)
+                return true
+            end
+        end
+        return false
+    end
+
+    return conns
+end
+
 local function get_miss(self, key)
     local class = rawget(self, "_class")
 

lib/naughty/core.lua

@@ -14,9 +14,10 @@
 
 -- Package environment
 local capi = { screen = screen }
-local gdebug = require("gears.debug")
-local screen = require("awful.screen")
-local gtable = require("gears.table")
+local gdebug  = require("gears.debug")
+local screen  = require("awful.screen")
+local gtable  = require("gears.table")
+local gobject = require("gears.object")
 
 local naughty = {}
 
@@ -249,7 +250,7 @@ function naughty.suspend()
     properties.suspended = true
 end
 
-local conns = {}
+local conns = gobject._setup_class_signals(naughty)
 
 --- Connect a global signal on the notification engine.
 --
@@ -261,41 +262,21 @@ local conns = {}
 --
 -- @tparam string name The name of the signal
 -- @tparam function func The function to attach
+-- @staticfct naughty.connect_signal
 -- @usage naughty.connect_signal("added", function(notif)
 --    -- do something
 -- end)
--- @staticfct naughty.connect_signal
-function naughty.connect_signal(name, func)
-    assert(name)
-    conns[name] = conns[name] or {}
-    table.insert(conns[name], func)
-end
 
 --- Emit a notification signal.
 -- @tparam string name The signal name.
 -- @param ... The signal callback arguments
 -- @staticfct naughty.emit_signal
-function naughty.emit_signal(name, ...)
-    assert(name)
-    for _, func in pairs(conns[name] or {}) do
-        func(...)
-    end
-end
 
 --- Disconnect a signal from a source.
 -- @tparam string name The name of the signal
 -- @tparam function func The attached function
--- @treturn boolean If the disconnection was successful
 -- @staticfct naughty.disconnect_signal
-function naughty.disconnect_signal(name, func)
-    for k, v in ipairs(conns[name] or {}) do
-        if v == func then
-            table.remove(conns[name], k)
-            return true
-        end
-    end
-    return false
-end
+-- @treturn boolean If the disconnection was successful
 
 local function resume()
     properties.suspended = false