Add reason to complete function (#529)

fix #528

lua/cmp/config/mapping.lua

@@ -13,9 +13,10 @@ mapping = setmetatable({}, {
 })
 
 ---Invoke completion
-mapping.complete = function()
+---@param option cmp.ContextOption
+mapping.complete = function(option)
   return function(fallback)
-    if not require('cmp').complete() then
+    if not require('cmp').complete(option) then
       fallback()
     end
   end

lua/cmp/init.lua

@@ -52,8 +52,12 @@ cmp.get_config = function()
 end
 
 ---Invoke completion manually
-cmp.complete = function()
-  cmp.core:complete(cmp.core:get_context({ reason = cmp.ContextReason.Manual }))
+---@param option cmp.ContextOption
+cmp.complete = function(option)
+  option = option or {}
+  option.reason = option.reason or cmp.ContextReason.Manual
+
+  cmp.core:complete(cmp.core:get_context(option))
   return true
 end