feat: cmp async (#1583)

lua/cmp/core.lua

@@ -56,6 +56,7 @@ end
 ---@param option? cmp.ContextOption
 ---@return cmp.Context
 core.get_context = function(self, option)
+  self.context:abort()
   local prev = self.context:clone()
   prev.prev_context = nil
   prev.cache = nil
@@ -296,7 +297,7 @@ core.complete = function(self, ctx)
 end
 
 ---Update completion menu
-core.filter = async.throttle(function(self)
+local async_filter = async.wrap(function(self)
   self.filter.timeout = config.get().performance.throttle
 
   -- Check invalid condition.
@@ -323,20 +324,17 @@ core.filter = async.throttle(function(self)
   local ctx = self:get_context()
 
   -- Display completion results.
-  self.view:open(ctx, sources)
+  local did_open = self.view:open(ctx, sources)
+  local fetching = #self:get_sources(function(s)
+    return s.status == source.SourceStatus.FETCHING
+  end)
 
   -- Check onetime config.
-  if #self:get_sources(function(s)
-    if s.status == source.SourceStatus.FETCHING then
-      return true
-    elseif #s:get_entries(ctx) > 0 then
-      return true
-    end
-    return false
-  end) == 0 then
+  if not did_open and fetching == 0 then
     config.set_onetime({})
   end
-end, config.get().performance.throttle)
+end)
+core.filter = async.throttle(async_filter, config.get().performance.throttle)
 
 ---Confirm completion.
 ---@param e cmp.Entry