Vim mode supports command mode and insert mode with i, esc, and x bindings

spec/atom/editor-spec.coffee

@@ -23,6 +23,13 @@ describe "Editor", ->
     it "has a buffer", ->
       expect(editor.buffer).toBeDefined()
 
+  fdescribe '.set/getCursor', ->
+    it "moves the cursor", ->
+      editor.buffer.setText("012345")
+      expect(editor.getCursor()).toEqual {column: 6, row: 0}
+      editor.setCursor(column: 2, row: 0)
+      expect(editor.getCursor()).toEqual {column: 2, row: 0}
+
   describe 'destroy', ->
     it 'destroys the ace editor', ->
       spyOn(editor.aceEditor, 'destroy').andCallThrough()

spec/atom/vim-mode-spec.coffee

@@ -0,0 +1,46 @@
+Editor = require 'editor'
+VimMode = require 'vim-mode'
+
+describe "VimMode", ->
+  editor = null
+
+  beforeEach ->
+    editor = Editor.build()
+    editor.enableKeymap()
+    vimMode = new VimMode(editor)
+
+  describe "initialize", ->
+    it "puts the editor in command-mode initially", ->
+      expect(editor).toHaveClass 'command-mode'
+
+  describe "command-mode", ->
+    describe "the i keybinding", ->
+      it "puts the editor into insert mode", ->
+        expect(editor).not.toHaveClass 'insert-mode'
+
+        editor.trigger keydownEvent('i')
+
+        expect(editor).toHaveClass 'insert-mode'
+        expect(editor).not.toHaveClass 'command-mode'
+
+    fdescribe "the x keybinding", ->
+      it "deletes a charachter", ->
+        editor.buffer.setText("12345")
+        editor.setCursor(column: 1, row: 0)
+
+        editor.trigger keydownEvent('x')
+
+        expect(editor.buffer.getText()).toBe '1345'
+        expect(editor.getCursor()).toEqual(column: 1, row: 0)
+
+  describe "insert-mode", ->
+    beforeEach ->
+      editor.trigger keydownEvent('i')
+
+    it "puts the editor into command mode when <esc> is pressed", ->
+      expect(editor).not.toHaveClass 'command-mode'
+
+      editor.trigger keydownEvent('<esc>')
+
+      expect(editor).toHaveClass 'command-mode'
+      expect(editor).not.toHaveClass 'insert-mode'

src/atom/editor.coffee

@@ -55,3 +55,14 @@ class Editor extends Template
         @buffer.url = url
         @buffer.save()
 
+    setCursor: ({column, row}) ->
+      @aceEditor.moveCursorToPosition({column, row})
+
+    getCursor: ->
+      @getAceSession().getSelection().getCursor()
+
+    delete: ->
+      @aceEditor.remove 'right'
+
+
+

src/atom/root-view.coffee

@@ -8,6 +8,7 @@ Editor = require 'editor'
 FileFinder = require 'file-finder'
 Project = require 'project'
 GlobalKeymap = require 'global-keymap'
+VimMode = require 'vim-mode'
 
 module.exports =
 class RootView extends Template
@@ -22,6 +23,7 @@ class RootView extends Template
     globalKeymap: null
 
     initialize: ({url}) ->
+      new VimMode(@editor)
       @editor.keyEventHandler = atom.globalKeymap
       @createProject(url)
 

src/atom/vim-mode.coffee

@@ -0,0 +1,28 @@
+module.exports =
+class VimMode
+  editor: null
+
+  constructor: (@editor) ->
+    atom.bindKeys '.command-mode'
+      'i': 'insert-mode:activate'
+      'x': 'command-mode:delete'
+
+    atom.bindKeys '.insert-mode'
+      '<esc>': 'command-mode:activate'
+
+    @editor.addClass('command-mode')
+
+    @editor.on 'insert-mode:activate', => @activateInsertMode()
+    @editor.on 'command-mode:activate', => @activateCommandMode()
+    @editor.on 'command-mode:delete', => @delete()
+
+  activateInsertMode: ->
+    @editor.removeClass('command-mode')
+    @editor.addClass('insert-mode')
+
+  activateCommandMode: ->
+    @editor.removeClass('insert-mode')
+    @editor.addClass('command-mode')
+
+  delete: ->
+    @editor.delete()