app.coffee

event = require('pilot/event')
Anchor = require('ace/anchor').Anchor
doc = ace_editor.session.getDocument()

editablePositions = [[1, 0, 2, 0]] # allow editong only the second row
jQuery.each editable, (index, row) ->
  editablePositions.push [new Anchor(doc, row[0], row[1]), new Anchor(doc, row[2], row[3])]

Range = require('ace/range').Range

event.addListener(jQuery('#ace textarea')[0], 'keydown', (e) ->
  # console.log e.type, e.charCode, e.keyCode, e
  position = ace_editor.getCursorPosition()
  
  setReadOnly = false
  
  jQuery.each editablePositions, (index, editableAnchors) ->
    editableRange = Range.fromPoints editableAnchors[0].getPosition(), editableAnchors[1].getPosition()
    setReadOnly = !editableRange.contains(position.row, position.column)
  
  ace_editor.setReadOnly setReadOnly
)