Slave CursorView's screen position to its cursor model. Move moveUp and moveDown methods into cursor model.

src/app/cursor-view.coffee

@@ -17,6 +17,10 @@ class CursorView extends View
   initialize: (@cursor, @editor) ->
     @anchor = new Anchor(@editor, cursor.getScreenPosition())
     @selection = @editor.compositeSelection.addSelectionForCursor(this)
+    @cursor.on 'change-screen-position', (position, options) =>
+      options.fromModel = true
+      @setScreenPosition(position, options)
+    @cursor.on 'destroy', => @remove()
 
   afterAttach: (onDom) ->
     return unless onDom
@@ -24,32 +28,38 @@ class CursorView extends View
     @editor.syncCursorAnimations()
 
   handleBufferChange: (e) ->
-    @anchor.handleBufferChange(e)
-    @refreshScreenPosition()
+    @cursor.handleBufferChange(e)
+    # @anchor.handleBufferChange(e)
+    # @refreshScreenPosition()
     @trigger 'cursor-move', bufferChange: true
 
   remove: ->
     @editor.compositeCursor.removeCursor(this)
     @editor.compositeSelection.removeSelectionForCursor(this)
+    @cursor.off()
     super
 
   getBufferPosition: ->
-    @anchor.getBufferPosition()
+    @cursor.getBufferPosition()
 
   setBufferPosition: (bufferPosition, options={}) ->
-    @anchor.setBufferPosition(bufferPosition, options)
-    @refreshScreenPosition()
-    @trigger 'cursor-move', bufferChange: false
-    @clearSelection()
+    @cursor.setBufferPosition(bufferPosition, options)
+    # @anchor.setBufferPosition(bufferPosition, options)
+    # @refreshScreenPosition()
+    # @trigger 'cursor-move', bufferChange: false
+    # @clearSelection()
 
   getScreenPosition: ->
     @anchor.getScreenPosition()
 
   setScreenPosition: (position, options={}) ->
-    @anchor.setScreenPosition(position, options)
-    @refreshScreenPosition(position, options)
-    @trigger 'cursor-move', bufferChange: false
-    @clearSelection()
+    if options.fromModel
+      @anchor.setScreenPosition(position, options)
+      @refreshScreenPosition()
+      @trigger 'cursor-move', bufferChange: options.bufferChange
+      @clearSelection() unless options.bufferChange
+    else
+      @cursor.setScreenPosition(position, options)
 
   refreshScreenPosition: ->
     @goalColumn = null
@@ -73,18 +83,6 @@ class CursorView extends View
   isOnEOL: ->
     @getScreenPosition().column == @getCurrentBufferLine().length
 
-  moveUp: ->
-    { row, column } = @getScreenPosition()
-    column = @goalColumn if @goalColumn?
-    @setScreenPosition({row: row - 1, column: column})
-    @goalColumn = column
-
-  moveDown: ->
-    { row, column } = @getScreenPosition()
-    column = @goalColumn if @goalColumn?
-    @setScreenPosition({row: row + 1, column: column})
-    @goalColumn = column
-
   moveToNextWord: ->
     bufferPosition = @getBufferPosition()
     range = [bufferPosition, @editor.getEofPosition()]

src/app/cursor.coffee

@@ -1,25 +1,53 @@
 Point = require 'point'
 Anchor = require 'new-anchor'
+EventEmitter = require 'event-emitter'
+_ = require 'underscore'
 
 module.exports =
 class Cursor
   screenPosition: null
   bufferPosition: null
+  goalColumn: null
 
   constructor: ({@editSession, screenPosition, bufferPosition}) ->
     @anchor = new Anchor(@editSession)
     @setScreenPosition(screenPosition) if screenPosition
     @setBufferPosition(bufferPosition) if bufferPosition
 
-  setScreenPosition: (screenPosition) ->
-    @anchor.setScreenPosition(screenPosition)
+  setScreenPosition: (screenPosition, options) ->
+    @anchor.setScreenPosition(screenPosition, options)
+    @goalColumn = null
+    @trigger 'change-screen-position', @getScreenPosition(), bufferChange: false
 
   getScreenPosition: ->
     @anchor.getScreenPosition()
 
-  setBufferPosition: (bufferPosition) ->
-    @anchor.setBufferPosition(bufferPosition)
+  setBufferPosition: (bufferPosition, options) ->
+    @anchor.setBufferPosition(bufferPosition, options)
+    @goalColumn = null
+    @trigger 'change-screen-position', @getScreenPosition(), bufferChange: false
 
   getBufferPosition: ->
     @anchor.getBufferPosition()
 
+  handleBufferChange: (e) ->
+    @anchor.handleBufferChange(e)
+    @trigger 'change-screen-position', @getScreenPosition(), bufferChange: true
+
+  moveUp: ->
+    { row, column } = @getScreenPosition()
+    column = @goalColumn if @goalColumn?
+    @setScreenPosition({row: row - 1, column: column})
+    @goalColumn = column
+
+  moveDown: ->
+    { row, column } = @getScreenPosition()
+    column = @goalColumn if @goalColumn?
+    @setScreenPosition({row: row + 1, column: column})
+    @goalColumn = column
+
+  destroy: ->
+    @editSession.removeCursor(this)
+    @trigger 'destroy'
+
+_.extend Cursor.prototype, EventEmitter

src/app/edit-session.coffee

@@ -64,14 +64,42 @@ class EditSession
     @trigger 'add-cursor', cursor
     cursor
 
+  removeCursor: (cursor) ->
+    _.remove(@cursors, cursor)
+
+  getLastCursor: ->
+    _.last(@cursors)
+
   setCursorScreenPosition: (position) ->
-    @getLastCursor().setScreenPosition(position)
+    @moveCursors (cursor) -> cursor.setScreenPosition(position)
 
   getCursorScreenPosition: ->
     @getLastCursor().getScreenPosition()
 
-  getLastCursor: ->
-    _.last(@cursors)
+  setCursorBufferPosition: (position) ->
+    @moveCursors (cursor) -> cursor.setBufferPosition(position)
+
+  getCursorBufferPosition: ->
+    @getLastCursor().getBufferPosition()
+
+  moveCursorUp: ->
+    @moveCursors (cursor) -> cursor.moveUp()
+
+  moveCursorDown: ->
+    @moveCursors (cursor) -> cursor.moveDown()
+
+  moveCursors: (fn) ->
+    fn(cursor) for cursor in @getCursors()
+    @mergeCursors()
+
+  mergeCursors: ->
+    positions = []
+    for cursor in new Array(@getCursors()...)
+      position = cursor.getBufferPosition().toString()
+      if position in positions
+        cursor.destroy()
+      else
+        positions.push(position)
 
   isEqual: (other) ->
     return false unless other instanceof EditSession

src/app/editor.coffee

@@ -640,8 +640,8 @@ class Editor extends View
       @updateRenderedLines()
 
   getCursors: -> @compositeCursor.getCursors()
-  moveCursorUp: -> @compositeCursor.moveUp()
-  moveCursorDown: -> @compositeCursor.moveDown()
+  moveCursorUp: -> @activeEditSession.moveCursorUp()
+  moveCursorDown: -> @activeEditSession.moveCursorDown()
   moveCursorRight: -> @compositeCursor.moveRight()
   moveCursorLeft: -> @compositeCursor.moveLeft()
   moveCursorToNextWord: -> @compositeCursor.moveToNextWord()
@@ -652,10 +652,10 @@ class Editor extends View
   moveCursorToBeginningOfLine: -> @compositeCursor.moveToBeginningOfLine()
   moveCursorToFirstCharacterOfLine: -> @compositeCursor.moveToFirstCharacterOfLine()
   moveCursorToEndOfLine: -> @compositeCursor.moveToEndOfLine()
-  setCursorScreenPosition: (position) -> @compositeCursor.setScreenPosition(position)
-  getCursorScreenPosition: -> @compositeCursor.getCursor().getScreenPosition()
-  setCursorBufferPosition: (position) -> @compositeCursor.setBufferPosition(position)
-  getCursorBufferPosition: -> @compositeCursor.getCursor().getBufferPosition()
+  setCursorScreenPosition: (position) -> @activeEditSession.setCursorScreenPosition(position)
+  getCursorScreenPosition: -> @activeEditSession.getCursorScreenPosition()
+  setCursorBufferPosition: (position) -> @activeEditSession.setCursorBufferPosition(position)
+  getCursorBufferPosition: -> @activeEditSession.getCursorBufferPosition()
 
   getSelection: (index) -> @compositeSelection.getSelection(index)
   getSelections: -> @compositeSelection.getSelections()

src/app/event-emitter.coffee

@@ -16,13 +16,13 @@ module.exports =
 
     @afterSubscribe?()
 
-  trigger: (eventName, event) ->
+  trigger: (eventName, args...) ->
     [eventName, namespace] = eventName.split('.')
 
     if namespace
-      @eventHandlersByNamespace?[namespace]?[eventName]?.forEach (handler) -> handler(event)
+      @eventHandlersByNamespace?[namespace]?[eventName]?.forEach (handler) -> handler(args...)
     else
-      @eventHandlersByEventName?[eventName]?.forEach (handler) -> handler(event)
+      @eventHandlersByEventName?[eventName]?.forEach (handler) -> handler(args...)
 
   off: (eventName='', handler) ->
     [eventName, namespace] = eventName.split('.')

src/app/selection.coffee

@@ -208,10 +208,10 @@ class Selection extends View
     @modifySelection => @cursor.moveLeft()
 
   selectUp: ->
-    @modifySelection => @cursor.moveUp()
+    @modifySelection => @cursor.cursor.moveUp()
 
   selectDown: ->
-    @modifySelection => @cursor.moveDown()
+    @modifySelection => @cursor.cursor.moveDown()
 
   selectToTop: ->
     @modifySelection => @cursor.moveToTop()