RootView.open takes an 'allowActiveEditorChange' option

When the 'allowActiveEditorChange' option is true, RootView will try to activate an existing edit session for the given path on *any* editor, and switch focus there. This will be used by the fuzzy-finder for the meta-b option, which should open the chosen buffer on the editor that contains it, even if it isn't currently active.

src/app/editor.coffee

@@ -389,6 +389,13 @@ class Editor extends View
 
     @renderWhenAttached()
 
+  activateEditSessionForPath: (path) ->
+    for editSession, index in @editSessions
+      if editSession.buffer.getPath() == path
+        @setActiveEditSessionIndex(index)
+        return true
+    false
+
   getOpenBufferPaths: ->
     editSession.buffer.path for editSession in @editSessions when editSession.buffer.path?
 

src/app/root-view.coffee

@@ -91,13 +91,12 @@ class RootView extends View
     extension.deactivate?() for name, extension of @extensions
     @remove()
 
-  open: (path, changeFocus=true) ->
-    editSession = @project.open(path)
+  open: (path, options = {}) ->
+    changeFocus = options.changeFocus ? true
+    allowActiveEditorChange = options.allowActiveEditorChange ? false
 
-    if @activeEditor()
-      @activeEditor().edit(editSession)
-    else
-      editor = new Editor(editSession: editSession)
+    unless @openInExistingEditor(path, allowActiveEditorChange)
+      editor = new Editor(editSession: @project.open(path))
       pane = new Pane(editor)
       @panes.append(pane)
       if changeFocus
@@ -105,6 +104,24 @@ class RootView extends View
       else
         @makeEditorActive(editor)
 
+  openInExistingEditor: (path, allowActiveEditorChange) ->
+    if activeEditor = @activeEditor()
+      path = @project.resolve(path) if path
+
+      if activeEditor.activateEditSessionForPath(path)
+        return true
+
+      if allowActiveEditorChange
+        for editor in @editors()
+          if editor.activateEditSessionForPath(path)
+            editor.focus()
+            return true
+
+      activeEditor.edit(@project.open(path))
+      true
+    else
+      false
+
   editorFocused: (editor) ->
     @makeEditorActive(editor) if @panes.containsElement(editor)