Custom Binding Key Map for Atom Editor

init.coffee

# 
init.coffee
atom.commands.add 'atom-text-editor', 'exit-insert-mode-if-proceeded-by-j': (e) ->
  editor = @getModel()
  pos = editor.getCursorBufferPosition()
  range = [pos.traverse([0,-1]), pos]
  lastChar = editor.getTextInBufferRange(range)
  if lastChar != "j"
    e.abortKeyBinding()
  else
    editor.backspace()
    atom.commands.dispatch(e.currentTarget, 'vim-mode:activate-normal-mode')

atom.commands.add 'atom-text-editor', 'exit-insert-mode-if-proceeded-by-o': (e) ->
  atom.commands.dispatch(e.currentTarget, 'vim-mode:insert-below-with-newline')
  atom.commands.dispatch(e.currentTarget, 'vim-mode:activate-mormal-mode')

atom.commands.add 'atom-text-editor', 'exit-insert-mode-if-proceeded-by-shift-o': (e) ->
  atom.commands.dispatch(e.currentTarget, 'vim-mode:insert-above-with-newline')
  atom.commands.dispatch(e.currentTarget, 'vim-mode:activate-normal-mode')

keymap.cson

# keymap.cson
'atom-text-editor.vim-mode.insert-mode':
  'k': 'exit-insert-mode-if-proceeded-by-j'

'atom-text-editor.vim-mode.command-mode':
  'shift-O': 'exit-insert-mode-if-proceeded-by-shift-o'
  'o': 'exit-insert-mode-if-proceeded-by-o'

new_remapping.cson

# keymap.cson
# Work with Atom +1.05

'atom-text-editor.vim-mode.insert-mode':
  'j j': 'vim-mode:activate-normal-mode'