Simple :grep using vscode search

src/cmd_line/commands/grep.ts

@@ -0,0 +1,23 @@
+import { VimState } from '../../state/vimState';
+import { ExCommand } from '../../vimscript/exCommand';
+import { optWhitespace, Parser, regex } from 'parsimmon';
+import * as vscode from 'vscode';
+
+export class GrepCommand extends ExCommand {
+  public static readonly argParser: Parser<GrepCommand> = optWhitespace
+    .then(regex(/.*/))
+    .map((pattern) => new GrepCommand(pattern.trim()));
+
+  private pattern: string;
+  private constructor(pattern: string) {
+    super();
+    this.pattern = pattern;
+  }
+
+  async execute(vimState: VimState): Promise<void> {
+    vscode.commands.executeCommand('workbench.action.findInFiles', {
+      query: this.pattern,
+      triggerSearch: true,
+    });
+  }
+}

src/vimscript/exCommandParser.ts

@@ -52,6 +52,7 @@ import { LineRange } from './lineRange';
 import { nameAbbrevParser } from './parserUtils';
 import { LetCommand } from '../cmd_line/commands/let';
 import { CallCommand, EvalCommand } from '../cmd_line/commands/eval';
+import { GrepCommand } from '../cmd_line/commands/grep';
 
 type ArgParser = Parser<ExCommand>;
 
@@ -247,7 +248,7 @@ export const builtinExCommands: ReadonlyArray<[[string, string], ArgParser | und
   [['fu', 'nction'], undefined],
   [['g', 'lobal'], undefined],
   [['go', 'to'], GotoCommand.argParser],
-  [['gr', 'ep'], undefined],
+  [['gr', 'ep'], GrepCommand.argParser],
   [['grepa', 'dd'], undefined],
   [['gu', 'i'], undefined],
   [['gv', 'im'], undefined],