Adding meta-backspace which will backspace from cursor to the beginning of line

src/app/edit-session.coffee

@@ -186,6 +186,9 @@ class EditSession
   backspaceToBeginningOfWord: ->
     @mutateSelectedText (selection) -> selection.backspaceToBeginningOfWord()
 
+  backspaceToBeginningOfLine: ->
+    @mutateSelectedText (selection) -> selection.backspaceToBeginningOfLine()
+
   delete: ->
     @mutateSelectedText (selection) -> selection.delete()
 

src/app/editor.coffee

@@ -122,6 +122,7 @@ class Editor extends View
       'editor:indent-selected-rows': @indentSelectedRows
       'editor:outdent-selected-rows': @outdentSelectedRows
       'editor:backspace-to-beginning-of-word': @backspaceToBeginningOfWord
+      'editor:backspace-to-beginning-of-line': @backspaceToBeginningOfLine
       'editor:delete-to-end-of-word': @deleteToEndOfWord
       'editor:delete-line': @deleteLine
       'editor:cut-to-end-of-line': @cutToEndOfLine
@@ -223,6 +224,7 @@ class Editor extends View
 
   backspace: -> @activeEditSession.backspace()
   backspaceToBeginningOfWord: -> @activeEditSession.backspaceToBeginningOfWord()
+  backspaceToBeginningOfLine: -> @activeEditSession.backspaceToBeginningOfLine()
   delete: -> @activeEditSession.delete()
   deleteToEndOfWord: -> @activeEditSession.deleteToEndOfWord()
   deleteLine: -> @activeEditSession.deleteLine()

src/app/keymaps/apple.coffee

@@ -14,5 +14,6 @@ window.keymap.bindKeys '.editor'
   'alt-shift-left': 'editor:select-to-beginning-of-word'
   'alt-shift-right': 'editor:select-to-end-of-word'
   'alt-backspace': 'editor:backspace-to-beginning-of-word'
+  'meta-backspace': 'editor:backspace-to-beginning-of-line'
   'alt-delete': 'editor:delete-to-end-of-word'
   'ctrl-t': 'editor:transpose'

src/app/selection.coffee

@@ -255,6 +255,10 @@ class Selection
     @selectToBeginningOfWord() if @isEmpty()
     @deleteSelectedText()
 
+  backspaceToBeginningOfLine: ->
+    @selectToBeginningOfLine() if @isEmpty()
+    @deleteSelectedText()
+
   delete: ->
     if @isEmpty()
       if @cursor.isAtEndOfLine() and fold = @editSession.largestFoldStartingAtScreenRow(@cursor.getScreenRow() + 1)