center cell (#33)

Author: jwkvam

README.md

@@ -31,6 +31,7 @@ Shortcuts this extension introduces:
 | Chord          | Action                    |
 | -----          | -------                   |
 | Ctrl-O, U      | Undo Cell Action          |
+| -              | Split Cell at Cursor      |
 | Ctrl-O, -      | Split Cell at Cursor      |
 | Ctrl-O, D      | Cut Cell                  |
 | Ctrl-O, Y      | Copy Cell                 |
@@ -45,6 +46,7 @@ Shortcuts this extension introduces:
 | Ctrl-O, Ctrl-G | Select Last Cell          |
 | Ctrl-E         | Move Cell Down            |
 | Ctrl-Y         | Move Cell Up              |
+| Ctrl-O, Z, Z   | Center Cell               |
 | Command/Ctrl-1 | Code Cell Mode            |
 | Command/Ctrl-2 | Markdown Cell Mode        |
 | Command/Ctrl-3 | Raw Cell Mode             |
@@ -65,6 +67,7 @@ Shortcuts this extension introduces:
 | U       | Undo Cell Action  |
 | Ctrl-E  | Move Cells Down   |
 | Ctrl-Y  | Move Cells Up     |
+| Z, Z    | Center Cell       |
 
 ## Prerequisites
 

src/index.ts

@@ -175,6 +175,10 @@ class VimCell {
             });
             lvim.mapCommand('<C-e>', 'action', 'moveCellDown', {}, {extra: 'normal'});
             lvim.mapCommand('<C-y>', 'action', 'moveCellUp', {}, {extra: 'normal'});
+            lvim.defineAction('splitCell', (cm: any, actionArgs: any) => {
+                commands.execute('notebook:split-cell-at-cursor');
+            });
+            lvim.mapCommand('-', 'action', 'splitCell', {}, {extra: 'normal'});
         }
     }
 
@@ -352,6 +356,18 @@ function activateCellVim(app: JupyterLab, tracker: INotebookTracker): Promise<vo
             },
             isEnabled
         });
+        commands.addCommand('center-cell', {
+            label: 'Center Cell',
+            execute: args => {
+                const current = getCurrent(args);
+
+                if (current) {
+                    let er = current.notebook.activeCell.inputArea.node.getBoundingClientRect();
+                    current.notebook.scrollToPosition(er.bottom, 0);
+                }
+            },
+            isEnabled
+        });
 
         commands.addKeyBinding({
             selector: '.jp-Notebook.jp-mod-editMode',
@@ -529,6 +545,16 @@ function activateCellVim(app: JupyterLab, tracker: INotebookTracker): Promise<vo
             keys: ['Ctrl Y'],
             command: 'notebook:move-cell-up'
         });
+        commands.addKeyBinding({
+            selector: '.jp-Notebook:focus',
+            keys: ['Z', 'Z'],
+            command: 'center-cell'
+        });
+        commands.addKeyBinding({
+            selector: '.jp-Notebook.jp-mod-editMode',
+            keys: ['Ctrl O', 'Z', 'Z'],
+            command: 'center-cell'
+        });
 
         // tslint:disable:no-unused-expression
         new VimCell(app, tracker);