Merge pull request #10178 from atom/ku-pending-editor

Open file in pending state on single click

src/pane.coffee

@@ -337,13 +337,19 @@ class Pane extends Model
   #
   # * `index` {Number}
   activateItemAtIndex: (index) ->
-    @activateItem(@itemAtIndex(index))
+    item = @itemAtIndex(index) or @getActiveItem()
+    @setActiveItem(item)
 
   # Public: Make the given item *active*, causing it to be displayed by
   # the pane's view.
   activateItem: (item) ->
     if item?
-      @addItem(item, @getActiveItemIndex() + 1, false)
+      if @activeItem?.isPending?()
+        index = @getActiveItemIndex()
+        @destroyActiveItem() unless item is @activeItem
+      else
+        index = @getActiveItemIndex() + 1
+      @addItem(item, index, false)
       @setActiveItem(item)
 
   # Public: Add the given item to the pane.
@@ -574,7 +580,6 @@ class Pane extends Model
   # Public: Makes this pane the *active* pane, causing it to gain focus.
   activate: ->
     throw new Error("Pane has been destroyed") if @isDestroyed()
-
     @container?.setActivePane(this)
     @emitter.emit 'did-activate'
 

src/text-editor.coffee

@@ -92,7 +92,7 @@ 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?
@@ -161,6 +161,9 @@ 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 =>
+        @terminatePendingState() if @buffer.isModified()
 
     @preserveCursorPositionOnBufferReload()
 
@@ -569,6 +572,13 @@ class TextEditor extends Model
   getEditorWidthInChars: ->
     @displayBuffer.getEditorWidthInChars()
 
+  onDidTerminatePendingState: (callback) ->
+    @emitter.on 'did-terminate-pending-state', callback
+
+  terminatePendingState: ->
+    @pending = false
+    @emitter.emit 'did-terminate-pending-state', this
+
   ###
   Section: File Details
   ###
@@ -652,6 +662,9 @@ 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()