Implement completion additionalTextEdits

lib/adapters/autocomplete-adapter.ts

@@ -379,6 +379,8 @@ export default class AutocompleteAdapter {
       onDidConvertCompletionItem(item, suggestion as ac.AnySuggestion, request);
     }
 
+    suggestion.completionItem = item;
+
     return suggestion;
   }
 

lib/auto-languageclient.ts

@@ -471,7 +471,10 @@ export default class AutoLanguageClient {
       suggestionPriority: 2,
       excludeLowerPriority: false,
       getSuggestions: this.getSuggestions.bind(this),
-      onDidInsertSuggestion: this.onDidInsertSuggestion.bind(this),
+      onDidInsertSuggestion: (event) => {
+        this.handleAdditionalTextEdits(event);
+        this.onDidInsertSuggestion(event);
+      },
       getSuggestionDetailsOnSelect: this.getSuggestionDetailsOnSelect.bind(this),
     };
   }
@@ -510,6 +513,16 @@ export default class AutoLanguageClient {
   ): void {
   }
 
+  // Handle additional stuff after a suggestion insert, e.g. `additionalTextEdits`.
+  private handleAdditionalTextEdits(e: ac.SuggestionInsertedEvent): void {
+    const suggestion = e.suggestion as atomIde.SuggestionBase;
+    const additionalEdits = suggestion.completionItem && suggestion.completionItem.additionalTextEdits;
+    const buffer = e.editor.getBuffer();
+
+    ApplyEditAdapter.applyEdits(buffer, Convert.convertLsTextEdits(additionalEdits));
+    buffer.groupLastChanges();
+  }
+
   protected onDidInsertSuggestion(_arg: ac.SuggestionInsertedEvent): void { }
 
   // Definitions via LS documentHighlight and gotoDefinition------------

lib/convert.ts

@@ -225,7 +225,7 @@ export default class Convert {
    * @param textEdits The language server protocol {TextEdit} objects to convert.
    * @returns An {Array} of Atom {TextEdit} objects.
    */
-  public static convertLsTextEdits(textEdits: ls.TextEdit[] | null): TextEdit[] {
+  public static convertLsTextEdits(textEdits?: ls.TextEdit[] | null): TextEdit[] {
     return (textEdits || []).map(Convert.convertLsTextEdit);
   }
 

typings/atom-ide/index.d.ts

@@ -1,6 +1,7 @@
 declare module 'atom-ide' {
   import { Disposable, Grammar, Point, Range, TextEditor } from 'atom';
   import * as ac from 'atom/autocomplete-plus';
+  import { CompletionItem } from 'lib/languageclient';
 
   export interface OutlineProvider {
     name: string;
@@ -381,6 +382,9 @@ declare module 'atom-ide' {
      * was gathered from.
      */
     customReplacmentPrefix?: string;
+
+    /** Original completion item, if available */
+    completionItem?: CompletionItem;
   }
 
   export type TextSuggestion = SuggestionBase & ac.TextSuggestion;