Add pending status to text editors

Add event methods for 'did-confirm-pending-state'.

src/text-editor.coffee

@@ -92,9 +92,10 @@ class TextEditor extends Model
       softWrapped, @displayBuffer, @selectionsMarkerLayer, buffer, suppressCursorCreation,
       @mini, @placeholderText, lineNumberGutterVisible, largeFileMode, @config,
       @notificationManager, @packageManager, @clipboard, @viewRegistry, @grammarRegistry,
-      @project, @assert, @applicationDelegate
+      @project, @assert, @applicationDelegate, @pending
     } = params
 
+
     throw new Error("Must pass a config parameter when constructing TextEditors") unless @config?
     throw new Error("Must pass a notificationManager parameter when constructing TextEditors") unless @notificationManager?
     throw new Error("Must pass a packageManager parameter when constructing TextEditors") unless @packageManager?
@@ -161,6 +162,9 @@ class TextEditor extends Model
     @disposables.add @buffer.onDidChangeEncoding =>
       @emitter.emit 'did-change-encoding', @getEncoding()
     @disposables.add @buffer.onDidDestroy => @destroy()
+    if @pending
+      @disposables.add @buffer.onDidChangeModified =>
+        @confirmPendingState() if @buffer.isModified()
 
     @preserveCursorPositionOnBufferReload()
 
@@ -569,6 +573,13 @@ class TextEditor extends Model
   getEditorWidthInChars: ->
     @displayBuffer.getEditorWidthInChars()
 
+  onDidConfirmPendingState: (callback) ->
+    @emitter.on 'did-confirm-pending-state', callback
+
+  confirmPendingState: ->
+    @pending = false
+    @emitter.emit 'did-confirm-pending-state', this
+
   ###
   Section: File Details
   ###
@@ -652,6 +663,9 @@ class TextEditor extends Model
   # Essential: Returns {Boolean} `true` if this editor has no content.
   isEmpty: -> @buffer.isEmpty()
 
+  # Returns {Boolean} `true` if this editor is pending and `false` if it is permanent.
+  isPending: -> Boolean(@pending)
+
   # Copies the current file path to the native clipboard.
   copyPathToClipboard: ->
     if filePath = @getPath()