add moveToBeginningOf{Next,Previous}Paragraph for cursor and wrappers for editor

spec/editor-spec.coffee

@@ -622,6 +622,38 @@ describe "Editor", ->
         editor.moveCursorToBeginningOfNextWord()
         expect(editor.getCursorBufferPosition()).toEqual [11, 9]
 
+    describe ".moveCursorToBeginningOfNextParagraph()", ->
+      it "moves the cursor before the first line of the next paragraph", ->
+        editor.setCursorBufferPosition [0,6]
+        cursor = editor.getCursor()
+
+        editor.moveCursorToBeginningOfNextParagraph()
+
+        expect(cursor.getBufferPosition()).toEqual  { row : 10, column : 0 }
+
+        editor.setText("")
+        editor.setCursorBufferPosition [0,0]
+        cursor = editor.getCursor()
+        editor.moveCursorToBeginningOfNextParagraph()
+
+        expect(cursor.getBufferPosition()).toEqual [0, 0]
+
+    describe ".moveCursorToBeginningOfPreviousParagraph()", ->
+      it "moves the cursor before the first line of the pevious paragraph", ->
+        editor.setCursorBufferPosition [10,0]
+        cursor = editor.getCursor()
+
+        editor.moveCursorToBeginningOfPreviousParagraph()
+
+        expect(cursor.getBufferPosition()).toEqual  { row : 0, column : 0 }
+
+        editor.setText("")
+        editor.setCursorBufferPosition [0,0]
+        cursor = editor.getCursor()
+        editor.moveCursorToBeginningOfPreviousParagraph()
+
+        expect(cursor.getBufferPosition()).toEqual [0, 0]
+
     describe ".getCurrentParagraphBufferRange()", ->
       it "returns the buffer range of the current paragraph, delimited by blank lines or the beginning / end of the file", ->
         buffer.setText """

src/cursor.coffee

@@ -457,6 +457,43 @@ class Cursor extends Model
   getCurrentLineBufferRange: (options) ->
     @editor.bufferRangeForBufferRow(@getBufferRow(), options)
 
+  # Public: Moves the cursor to the beginning of the next paragraph
+  moveToBeginningOfNextParagraph: ->
+    if position = @getBeginningOfNextParagraphBufferPosition()
+      @setBufferPosition(position)
+
+  # Public: Moves the cursor to the beginning of the previous paragraph
+  moveToBeginningOfPreviousParagraph: ->
+    if position = @getBeginningOfPreviousParagraphBufferPosition()
+      @setBufferPosition(position)
+
+  getBeginningOfNextParagraphBufferPosition: (editor) ->
+    start = @getBufferPosition()
+    eof = @editor.getEofBufferPosition()
+    scanRange = [start, eof]
+
+    {row, column} = eof
+    position = new Point(row, column - 1)
+
+    @editor.scanInBufferRange /^\n*$/g, scanRange, ({range, stop}) =>
+      if !range.start.isEqual(start)
+        position = range.start
+        stop()
+    @editor.screenPositionForBufferPosition(position)
+
+  getBeginningOfPreviousParagraphBufferPosition: (editor) ->
+    start = @editor.getCursorBufferPosition()
+
+    {row, column} = start
+    scanRange = [[row-1, column], [0,0]]
+    position = new Point(0, 0)
+    zero = new Point(0,0)
+    @editor.backwardsScanInBufferRange /^\n*$/g, scanRange, ({range, stop}) =>
+      if !range.start.isEqual(zero)
+        position = range.start
+        stop()
+    @editor.screenPositionForBufferPosition(position)
+
   # Public: Retrieves the range for the current paragraph.
   #
   # A paragraph is defined as a block of text surrounded by empty lines.

src/editor.coffee

@@ -1488,6 +1488,14 @@ class Editor extends Model
   moveCursorToNextWordBoundary: ->
     @moveCursors (cursor) -> cursor.moveToNextWordBoundary()
 
+  # Public: Move every cursor to the beginning of the next paragraph.
+  moveCursorToBeginningOfNextParagraph: ->
+    @moveCursors (cursor) -> cursor.moveToBeginningOfNextParagraph()
+
+  # Public: Move every cursor to the beginning of the previous paragraph.
+  moveCursorToBeginningOfPreviousParagraph: ->
+    @moveCursors (cursor) -> cursor.moveToBeginningOfPreviousParagraph()
+
   scrollToCursorPosition: ->
     @getCursor().autoscroll()