Support incomplete items of LSP server

autoload/ddc_vim_lsp.vim

@@ -9,8 +9,10 @@ function! ddc_vim_lsp#_callback(server, position, id, data) abort
       \ 'response': a:data['response'],
       \ }
   let lspitems = lsp#omni#get_vim_completion_items(l:options)['items']
+  let isIncomplete = has_key(a:data['response']['result'], 'isIncomplete') ? 
+        \ a:data['response']['result']['isIncomplete'] : v:false
 
-  call ddc#callback(a:id, lspitems)
+  call ddc#callback(a:id, {'items': lspitems, 'isIncomplete': isIncomplete})
 endfunction
 
 function! ddc_vim_lsp#request(server_name, id) abort

denops/@ddc-sources/vim-lsp.ts

@@ -1,20 +1,21 @@
 import {
   BaseSource,
-  Candidate,
-} from "https://deno.land/x/ddc_vim@v1.2.0/types.ts#^";
+  Item,
+  DdcGatherItems,
+} from "https://deno.land/x/ddc_vim@v2.0.0/types.ts#^";
 
 import {
-  GatherCandidatesArguments,
-} from "https://deno.land/x/ddc_vim@v1.2.0/base/source.ts#^";
+  GatherArguments,
+} from "https://deno.land/x/ddc_vim@v2.0.0/base/source.ts#^";
 
 // deno-lint-ignore ban-types
 type Params = {};
 
 export class Source extends BaseSource<Params> {
   private counter = 0;
-  async gatherCandidates(
-    args: GatherCandidatesArguments<Params>,
-  ): Promise<Candidate[]> {
+  async gather(
+    args: GatherArguments<Params>,
+  ): Promise<DdcGatherItems> {
     this.counter = (this.counter + 1) % 100;
 
     const lspservers: string[] = await args.denops.call(
@@ -27,11 +28,14 @@ export class Source extends BaseSource<Params> {
 
     const id = `source/${this.name}/${this.counter}`;
 
-    const [items] = await Promise.all([
-      args.onCallback(id) as Promise<Candidate[]>,
+    const [payload] = await Promise.all([
+      args.onCallback(id) as Promise<{
+        items: Item[];
+        isIncomplete: boolean;
+      }>,
       args.denops.call("ddc_vim_lsp#request", lspservers[0], id),
     ]);
-    return items;
+    return { items: payload.items, isIncomplete: payload.isIncomplete };
   }
 
   params(): Params {