Add completion.get_trigger_characters as configurable option

lua/cmp/config/default.lua

@@ -13,6 +13,9 @@ return function()
       completeopt = 'menu,menuone,noselect',
       keyword_pattern = [[\%(-\?\d\+\%(\.\d\+\)\?\|\h\w*\%(-\w*\)*\)]],
       keyword_length = 1,
+      get_trigger_characters = function(trigger_characters)
+        return trigger_characters
+      end
     },
 
     snippet = {

lua/cmp/source.lua

@@ -196,12 +196,16 @@ end
 ---Get trigger_characters
 ---@return string[]
 source.get_trigger_characters = function(self)
+  local trigger_characters = {}
   if self.source.get_trigger_characters then
-    return self.source:get_trigger_characters({
+    trigger_characters = self.source:get_trigger_characters({
       option = self:get_option(),
     }) or {}
   end
-  return {}
+  if config.get().completion.get_trigger_characters then
+    return config.get().completion.get_trigger_characters(trigger_characters)
+  end
+  return trigger_characters
 end
 
 ---Invoke completion

lua/cmp/types/cmp.lua

@@ -63,6 +63,7 @@ cmp.PreselectMode.None = 'none'
 ---@field public completeopt string
 ---@field public keyword_pattern string
 ---@field public keyword_length number
+---@field public get_trigger_characters fun(trigger_characters: string[]): string[]
 
 ---@class cmp.DocumentationConfig
 ---@field public border string[]