add: remove singleton pattern

The module pattern induced by Lua is enough for this module  use case.

init.lua

@@ -6,26 +6,30 @@
 -- easier to manage.
 -----
 
-local gtable = require 'gears.table'
+local gtable = require "gears.table"
 
 -- Load global awesome components from the C API
 local capi = {
     client = _G.client,
     screen = _G.screen,
-    tag = _G.tag
+    tag = _G.tag,
 }
 
 local awesome_slot = {
     mt = {},
-    _instance = nil,
-    slots = require 'awesome-slot.slots',
+    slots = require "awesome-slot.slots",
     static_connect = {
         client = capi.client,
         screen = capi.screen,
         tag = capi.tag,
-        ruled_client = require 'ruled.client',
-        ruled_notification = require 'ruled.notification'
-    }
+        ruled_client = require "ruled.client",
+        ruled_notification = require "ruled.notification",
+    },
+    registered_slots = {},
+    slot_status = {
+        CREATED = 1,
+        CONNECTED = 2,
+    },
 }
 
 local function generate_id(base_id)
@@ -40,54 +44,24 @@ local function generate_id(base_id)
     return id
 end
 
--- Singleton
-function awesome_slot.instance()
-    if not awesome_slot._instance then
-        awesome_slot._instance = {
-            slots = {}, -- List of created slot
-            -- Methods
-            do_action = awesome_slot.do_action,
-            create_slot = awesome_slot.create_slot,
-            delete_slot = awesome_slot.delete_slot,
-            connect_slot = awesome_slot.connect_slot,
-            disconnect_slot = awesome_slot.disconnect_slot,
-            get_slot = awesome_slot.get_slot
-        }
-    end
+local function get_slot(slot)
+    assert(slot)
+    local id = type(slot) == "string" and slot or slot.id
+    assert(id, "Slot not found!")
 
-    return awesome_slot._instance
+    return awesome_slot.registered_slots[id]
 end
 
-function awesome_slot:get_slot(id)
-    assert(id)
-    return self.slots[id]
-end
-
-awesome_slot.actions = {
-    NONE = 0,
-    CREATE = 1,
-    DELETE = 1 << 1,
-    CONNECT = 1 << 2,
-    DISCONNECT = 1 << 3
-}
-
-awesome_slot.slot_status = {
-    CREATED = 1,
-    CONNECTED = 2
-}
-
-function awesome_slot:create_slot(params)
-    local id = generate_id(params.id or "UNNAMED_SLOT")
-
+function awesome_slot.create_slot(params)
     local slot = {}
 
+    slot.id = generate_id(params.id or "UNNAMED_SLOT")
     slot.target = params.target
     slot.signal = params.signal
 
-    slot.params = params.slot_params
-
-    if slot.params then
-        slot.callback = function ()
+    if params.slot_params then
+        slot.params = params.slot_params
+        slot.callback = function()
             params.slot(slot.params)
         end
     else
@@ -96,35 +70,28 @@ function awesome_slot:create_slot(params)
 
     slot.status = awesome_slot.slot_status.CREATED
 
-    -- Insert the ne slot into the slots list
-    self.slots[id] = slot
+    -- Insert the new slot into the slots list
+    awesome_slot.registered_slots[slot.id] = slot
 
     return slot
 end
 
-function awesome_slot:delete_slot(params)
-    local slot = self:get_slot(params.id)
-
-    if not slot then
-        return false
-    end
+function awesome_slot.delete_slot(params)
+    local slot = get_slot(params)
 
+    -- We shouldn't delete slot if its still connected
     if slot.status == awesome_slot.slot_status.CONNECTED then
-        print 'please disconnnect the slot before deleting it'
+        print "please disconnnect the slot before deleting it"
         return false
     end
 
-    self.slots[params.id] = nil
+    awesome_slot.registered_slots[slot.id] = nil
 
     return true
 end
 
-function awesome_slot:connect_slot(params)
-    local slot = self:get_slot(params.id)
-
-    if not slot then
-        return false
-    end
+function awesome_slot.connect_slot(params)
+    local slot = get_slot(params)
 
     -- Some modules expose a static connect_signals function
     -- at the module level, while other tables/objects inheriting from
@@ -140,12 +107,8 @@ function awesome_slot:connect_slot(params)
     return slot
 end
 
-function awesome_slot:disconnect_slot(params)
-    local slot = self:get_slot(params.id)
-
-    if not slot then
-        return false
-    end
+function awesome_slot.disconnect_slot(params)
+    local slot = get_slot(params)
 
     -- Please check the `:connect_slot` method to understand why we do this.
     if gtable.hasitem(awesome_slot.static_connect, slot.target) then
@@ -159,35 +122,8 @@ function awesome_slot:disconnect_slot(params)
     return slot
 end
 
-function awesome_slot:do_action (params)
-    local params = params or {} -- luacheck: ignore shadowing params
-    local out = self
-
-    if not params.action then
-        return out
-    end
-
-    if awesome_slot.actions.DISCONNECT & params.action ~= 0 then
-        out = self:disconnect_slot(params)
-    end
-
-    if awesome_slot.actions.CREATE & params.action ~= 0 then
-        out = self:create_slot(params)
-    end
-
-    if awesome_slot.actions.DELETE & params.action ~= 0 then
-        out = self:delete_slot(params)
-    end
-
-    if awesome_slot.actions.CONNECT & params.action ~= 0 then
-        out = self:connect_slot(params)
-    end
-
-    return out
-end
-
-function awesome_slot.mt:__call(params) -- luacheck: ignore unused argument self
-    return awesome_slot.instance():do_action(params)
+function awesome_slot.mt:__call(...) -- luacheck: ignore unused argument self
+    return awesome_slot.connect_slot(awesome_slot.create_slot(...))
 end
 
 return setmetatable(awesome_slot, awesome_slot.mt)