From 2571b7dab76336102868bb353c462df2013e22ec Mon Sep 17 00:00:00 2001
From: rebornix <penn.lv@gmail.com>
Date: Tue, 12 Jul 2016 14:16:51 +0800
Subject: [PATCH] Ctrl+U and Ctrl+D

---
 ROADMAP.md              |  4 ++--
 extension.ts            |  2 +-
 package.json            | 16 +++++++++++++++-
 src/actions/actions.ts  | 20 ++++++++++++++++++++
 src/mode/modeHandler.ts |  2 ++
 5 files changed, 40 insertions(+), 4 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 94bc3d86b44..0b39e0481b6 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -367,10 +367,10 @@ Status | Command | Description
 Status | Command | Description
 ---|--------|------------------------------
 :x:    | :1234:  CTRL-E	| window N lines downwards (default: 1)
-  :x:  | :1234:  CTRL-D	| window N lines Downwards (default: 1/2 window)
+:warning:   | :1234:  CTRL-D	| window N lines Downwards (default: 1/2 window)
 :x:    | :1234:  CTRL-F	| window N pages Forwards (downwards)
   :x:  | :1234:  CTRL-Y	| window N lines upwards (default: 1)
- :x:   | :1234:  CTRL-U	| window N lines Upwards (default: 1/2 window)
+:warning:   | :1234:  CTRL-U	| window N lines Upwards (default: 1/2 window)
 :x:    | :1234:  CTRL-B	| window N pages Backwards (upwards)
 :x:    |    z CR or zt	| redraw, current line at top of window
 :warning: |    z.	 or zz	| redraw, current line at center of window
diff --git a/extension.ts b/extension.ts
index c2b1e36ae6b..04ac8a6da51 100644
--- a/extension.ts
+++ b/extension.ts
@@ -78,7 +78,7 @@ export function activate(context: vscode.ExtensionContext) {
         showCmdLine("", modeHandlerToFilename[activeFileName()]);
     });
 
-    'rfb'.split('').forEach(key => {
+    'rfbdu'.split('').forEach(key => {
         registerCommand(context, `extension.vim_ctrl+${key}`, () => handleKeyEvent(`ctrl+${key}`));
     });
 
diff --git a/package.json b/package.json
index 3ddd250ebce..06f54c4ebd8 100644
--- a/package.json
+++ b/package.json
@@ -67,6 +67,16 @@
                 "command": "extension.vim_ctrl+b",
                 "when": "editorTextFocus"
             },
+            {
+                "key": "ctrl+u",
+                "command": "extension.vim_ctrl+u",
+                "when": "editorTextFocus"
+            },
+            {
+                "key": "ctrl+d",
+                "command": "extension.vim_ctrl+d",
+                "when": "editorTextFocus"
+            },
             {
                 "key": "ctrl+w",
                 "command": "extension.vim_switchWindow",
@@ -109,7 +119,7 @@
                 "vim.insertModeKeyBindings": {
                     "type": "array",
                     "description": "Keybinding overrides to use for insert mode."
-                },
+                },   
                 "vim.useSolidBlockCursor": {
                     "type": "boolean",
                     "description": "Use a non blinking block cursor."
@@ -117,6 +127,10 @@
                 "vim.visualModeKeyBindings": {
                     "type": "object",
                     "description": "Keybinding overrides to use for visual mode."
+                },
+                "vim.scroll": {
+                    "type": "number",
+                    "description": "Number of lines to scroll with CTRL-U and CTRL-D commands."
                 }
             }
         }
diff --git a/src/actions/actions.ts b/src/actions/actions.ts
index cb39ead1b85..91bcca137a6 100644
--- a/src/actions/actions.ts
+++ b/src/actions/actions.ts
@@ -1013,6 +1013,26 @@ class CommandMoveFullPageUp extends BaseCommand {
   }
 }
 
+@RegisterAction
+class MCommandMoveHalfPageDown extends BaseMovement {
+  modes = [ModeName.Normal];
+  keys = ["ctrl+d"];
+
+  public async execAction(position: Position, vimState: VimState): Promise<Position> {
+    return new Position(Math.min(TextEditor.getLineCount() - 1, position.line + vimState.settings.scroll), position.character);
+  }
+}
+
+@RegisterAction
+class MCommandMoveHalfPageUp extends BaseMovement {
+  modes = [ModeName.Normal];
+  keys = ["ctrl+u"];
+
+  public async execAction(position: Position, vimState: VimState): Promise<Position> {
+    return new Position(Math.max(0, position.line - vimState.settings.scroll), position.character);
+  }
+}
+
 @RegisterAction
 class CommandDeleteToLineEnd extends BaseCommand {
   modes = [ModeName.Normal];
diff --git a/src/mode/modeHandler.ts b/src/mode/modeHandler.ts
index f1646d06f2d..812aaceaed7 100644
--- a/src/mode/modeHandler.ts
+++ b/src/mode/modeHandler.ts
@@ -125,6 +125,7 @@ export class VimState {
 
 export class VimSettings {
     useSolidBlockCursor = false;
+    scroll = 20;
 }
 
 export class SearchState {
@@ -477,6 +478,7 @@ export class ModeHandler implements vscode.Disposable {
     private loadSettings(): void {
         this._vimState.settings.useSolidBlockCursor = vscode.workspace.getConfiguration("vim")
             .get("useSolidBlockCursor", false);
+        this._vimState.settings.scroll = vscode.workspace.getConfiguration("vim").get("scroll", 20) || 20;
     }
 
     /**