WIP: Use rake to start compiling resources (like require.coffee)

src/app/fold.coffee

@@ -0,0 +1,74 @@
+Range = require 'range'
+Point = require 'point'
+
+module.exports =
+class Fold
+  @idCounter: 1
+
+  displayBuffer: null
+  startRow: null
+  endRow: null
+
+  constructor: (@displayBuffer, @startRow, @endRow) ->
+    @id = @constructor.idCounter++
+
+  destroy: ->
+    @displayBuffer.destroyFold(this)
+
+  inspect: ->
+    "Fold(#{@startRow}, #{@endRow})"
+
+  getBufferRange: ({includeNewline}={}) ->
+    if includeNewline
+      end = [@endRow + 1, 0]
+    else
+      end = [@endRow, Infinity]
+
+    new Range([@startRow, 0], end)
+
+  getBufferDelta: ->
+    new Point(@endRow - @startRow + 1, 0)
+
+  handleBufferChange: (event) ->
+    oldStartRow = @startRow
+
+    if @isContainedByRange(event.oldRange)
+      @displayBuffer.unregisterFold(@startRow, this)
+      return
+
+    @updateStartRow(event)
+    @updateEndRow(event)
+
+    if @startRow != oldStartRow
+      @displayBuffer.unregisterFold(oldStartRow, this)
+      @displayBuffer.registerFold(this)
+
+  isContainedByRange: (range) ->
+    range.start.row <= @startRow and @endRow <= range.end.row
+
+  isContainedByFold: (fold) ->
+    @isContainedByRange(fold.getBufferRange())
+
+  updateStartRow: (event) ->
+    { newRange, oldRange } = event
+
+    if oldRange.end.row < @startRow
+      delta = newRange.end.row - oldRange.end.row
+    else if newRange.end.row < @startRow
+      delta = newRange.end.row - @startRow
+    else
+      delta = 0
+
+    @startRow += delta
+
+  updateEndRow: (event) ->
+    { newRange, oldRange } = event
+
+    if oldRange.end.row <= @endRow
+      delta = newRange.end.row - oldRange.end.row
+    else if newRange.end.row <= @endRow
+      delta = newRange.end.row - @endRow
+    else
+      delta = 0
+
+    @endRow += delta