Added :only command and corresponding shortcuts

src/actions/commands/actions.ts

@@ -14,6 +14,7 @@ import { allowVSCodeToPropagateCursorUpdatesAndReturnThem } from '../../util';
 import { isTextTransformation } from './../../transformations/transformations';
 import { FileCommand } from './../../cmd_line/commands/file';
 import { QuitCommand } from './../../cmd_line/commands/quit';
+import { OnlyCommand } from './../../cmd_line/commands/only';
 import * as vscode from 'vscode';
 import * as util from './../../util';
 import { RegisterAction } from './../base';
@@ -2157,6 +2158,18 @@ class CommandQuit extends BaseCommand {
   }
 }
 
+@RegisterAction
+class CommandOnly extends BaseCommand {
+  modes = [ModeName.Normal];
+  keys = [["<C-w>", "o"], ["<C-w>", "C-o"]];
+
+  public async exec(position: Position, vimState: VimState): Promise<VimState> {
+    new OnlyCommand({}).execute();
+
+    return vimState;
+  }
+}
+
 @RegisterAction
 class MoveToRightPane extends BaseCommand {
   modes = [ModeName.Normal, ModeName.Visual, ModeName.VisualLine];

src/cmd_line/commands/only.ts

@@ -0,0 +1,24 @@
+"use strict";
+
+import * as vscode from "vscode";
+import * as node from "../node";
+
+export class OnlyCommand extends node.CommandBase {
+  protected _arguments: {};
+
+  constructor(args: {}) {
+    super();
+
+    this._name = 'only';
+    this._arguments = args;
+  }
+
+  get arguments(): {} {
+    return this._arguments;
+  }
+
+  async execute(): Promise<void> {
+      await vscode.commands.executeCommand("workbench.action.closeEditorsInOtherGroups");
+      return;
+  }
+}

src/cmd_line/subparser.ts

@@ -15,6 +15,7 @@ import { parseRegisterCommandArgs } from './subparsers/register';
 import { parseDeleteRangeLinesCommandArgs } from './subparsers/deleteRange';
 import { parseSortCommandArgs } from './subparsers/sort';
 import { parseCloseCommandArgs } from './subparsers/close';
+import { parseOnlyCommandArgs } from './subparsers/only';
 
 // maps command names to parsers for said commands.
 export const commandParsers = {
@@ -85,6 +86,7 @@ export const commandParsers = {
   vne: fileCmd.parseEditNewFileInNewWindowCommandArgs,
   new: fileCmd.parseEditNewFileInNewWindowCommandArgs,
   vnew: fileCmd.parseEditNewFileInNewWindowCommandArgs,
+  only: parseOnlyCommandArgs,
 
   set: parseOptionsCommandArgs,
   se: parseOptionsCommandArgs,

src/cmd_line/subparsers/only.ts

@@ -0,0 +1,7 @@
+"use strict";
+
+import * as node from "../commands/only";
+
+export function parseOnlyCommandArgs(args: string): node.OnlyCommand {
+  return new node.OnlyCommand({});
+}