From b385dbcc0fc1b8a1550a1bc4473c262432d02fb5 Mon Sep 17 00:00:00 2001
From: johnfn <johnfn@gmail.com>
Date: Thu, 9 Jun 2016 00:17:27 -0700
Subject: [PATCH] Add zz.

---
 src/actions/actions.ts  | 12 ++++++++++++
 src/mode/modeHandler.ts |  6 +++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/actions/actions.ts b/src/actions/actions.ts
index 2ef28ee1189..614e6dbd8db 100644
--- a/src/actions/actions.ts
+++ b/src/actions/actions.ts
@@ -394,6 +394,18 @@ class CommandFold extends BaseCommand {
   }
 }
 
+@RegisterAction
+class CommandCenterScroll extends BaseCommand {
+  modes = [ModeName.Normal];
+  keys = ["z", "z"];
+
+  public async exec(position: Position, vimState: VimState): Promise<VimState> {
+    vimState.commandAction = VimCommandActions.ScrollCursorToCenter;
+
+    return vimState;
+  }
+}
+
 @RegisterAction
 class CommandUnfold extends BaseCommand {
   modes = [ModeName.Normal];
diff --git a/src/mode/modeHandler.ts b/src/mode/modeHandler.ts
index 6b3f58ebf0f..2fcfb927e7b 100644
--- a/src/mode/modeHandler.ts
+++ b/src/mode/modeHandler.ts
@@ -29,6 +29,7 @@ export enum VimCommandActions {
     MoveFullPageDown,
     MoveFullPageUp,
     Dot,
+    ScrollCursorToCenter
 }
 
 /**
@@ -398,7 +399,6 @@ export class ModeHandler implements vscode.Disposable {
 
             vscode.window.activeTextEditor.revealRange(new vscode.Range(vimState.cursorPosition, vimState.cursorPosition));
 
-
             // Reset state
 
             vimState.actionState = new ActionState(vimState);
@@ -465,6 +465,10 @@ export class ModeHandler implements vscode.Disposable {
             case VimCommandActions.Redo: await vscode.commands.executeCommand("redo"); break;
             case VimCommandActions.MoveFullPageDown: await vscode.commands.executeCommand("cursorPageUp"); break;
             case VimCommandActions.MoveFullPageUp: await vscode.commands.executeCommand("cursorPageDown"); break;
+            case VimCommandActions.ScrollCursorToCenter:
+                vscode.window.activeTextEditor.revealRange(new vscode.Range(vimState.cursorPosition, vimState.cursorPosition),
+                                                           vscode.TextEditorRevealType.InCenter);
+            break;
             case VimCommandActions.Dot:
                 const oldDotKeysCopy = vimState.previousFullAction.slice(0);