Create a selection automatically as needed if the last one was destroyed

Fixes atom/bracket-matcher#102

spec/text-editor-spec.coffee

@@ -207,6 +207,15 @@ describe "TextEditor", ->
         lastCursor = editor.addCursorAtScreenPosition([2, 0])
         expect(editor.getLastCursor()).toBe lastCursor
 
+      it "creates a new cursor at (0, 0) if the last cursor has been destroyed", ->
+        editor.getLastCursor().destroy()
+        expect(editor.getLastCursor().getBufferPosition()).toEqual([0, 0])
+
+    describe ".getCursors()", ->
+      it "creates a new cursor at (0, 0) if the last cursor has been destroyed", ->
+        editor.getLastCursor().destroy()
+        expect(editor.getCursors()[0].getBufferPosition()).toEqual([0, 0])
+
     describe "when the cursor moves", ->
       it "clears a goal column established by vertical movement", ->
         editor.setText('b')
@@ -1027,6 +1036,16 @@ describe "TextEditor", ->
     beforeEach ->
       selection = editor.getLastSelection()
 
+    describe ".getLastSelection()", ->
+      it "creates a new selection at (0, 0) if the last selection has been destroyed", ->
+        editor.getLastSelection().destroy()
+        expect(editor.getLastSelection().getBufferRange()).toEqual([[0, 0], [0, 0]])
+
+    describe ".getSelections()", ->
+      it "creates a new selection at (0, 0) if the last selection has been destroyed", ->
+        editor.getLastSelection().destroy()
+        expect(editor.getSelections()[0].getBufferRange()).toEqual([[0, 0], [0, 0]])
+
     describe "when the selection range changes", ->
       it "emits an event with the old range, new range, and the selection that moved", ->
         editor.setSelectedBufferRange([[3, 0], [4, 5]])

src/text-editor.coffee

@@ -95,7 +95,7 @@ class TextEditor extends Model
     @subscribeToBuffer()
     @subscribeToDisplayBuffer()
 
-    if @getCursors().length is 0 and not suppressCursorCreation
+    if @cursors.length is 0 and not suppressCursorCreation
       initialLine = Math.max(parseInt(initialLine) or 0, 0)
       initialColumn = Math.max(parseInt(initialColumn) or 0, 0)
       @addCursorAtBufferPosition([initialLine, initialColumn])
@@ -185,7 +185,7 @@ class TextEditor extends Model
     @unsubscribe() if includeDeprecatedAPIs
     @disposables.dispose()
     @tabTypeSubscription.dispose()
-    selection.destroy() for selection in @getSelections()
+    selection.destroy() for selection in @selections.slice()
     @buffer.release()
     @displayBuffer.destroy()
     @languageMode.destroy()
@@ -1744,6 +1744,7 @@ class TextEditor extends Model
 
   # Extended: Returns the most recently added {Cursor}
   getLastCursor: ->
+    @createLastSelectionIfNeeded()
     _.last(@cursors)
 
   # Extended: Returns the word surrounding the most recently added cursor.
@@ -1754,6 +1755,7 @@ class TextEditor extends Model
 
   # Extended: Get an Array of all {Cursor}s.
   getCursors: ->
+    @createLastSelectionIfNeeded()
     @cursors.slice()
 
   # Extended: Get all {Cursors}s, ordered by their position in the buffer
@@ -2133,12 +2135,14 @@ class TextEditor extends Model
   #
   # Returns a {Selection}.
   getLastSelection: ->
+    @createLastSelectionIfNeeded()
     _.last(@selections)
 
   # Extended: Get current {Selection}s.
   #
   # Returns: An {Array} of {Selection}s.
   getSelections: ->
+    @createLastSelectionIfNeeded()
     @selections.slice()
 
   # Extended: Get all {Selection}s, ordered by their position in the buffer
@@ -2295,6 +2299,10 @@ class TextEditor extends Model
     @emit 'selection-screen-range-changed', event if includeDeprecatedAPIs
     @emitter.emit 'did-change-selection-range', event
 
+  createLastSelectionIfNeeded: ->
+    if @selections.length is 0
+      @addSelectionForBufferRange([[0, 0], [0, 0]], autoscroll: false, preserveFolds: true)
+
   ###
   Section: Searching and Replacing
   ###