Refactor a bit

lua/cmp/utils/autocmd.lua

@@ -0,0 +1,35 @@
+local debug = require('cmp.utils.debug')
+
+local autocmd = {}
+
+autocmd.events = {}
+
+---Subscribe autocmd
+---@param event string
+---@param callback function
+---@return function
+autocmd.subscribe = function(event, callback)
+  autocmd.events[event] = autocmd.events[event] or {}
+  table.insert(autocmd.events[event], callback)
+  return function()
+    for i, callback_ in ipairs(autocmd.events[event]) do
+      if callback_ == callback then
+        table.remove(autocmd.events[event], i)
+        break
+      end
+    end
+  end
+end
+
+---Emit autocmd
+---@param event string
+autocmd.emit = function(event)
+  debug.log(' ')
+  debug.log(string.format('>>> %s', event))
+  autocmd.events[event] = autocmd.events[event] or {}
+  for _, callback in ipairs(autocmd.events[event]) do
+    callback()
+  end
+end
+
+return autocmd