Xcode — quickly open current file in external editor

Question

Is it possible to set a keyboard shortcut (or maybe add some menu item somewhere) to open currently edited file in external editor?

(Obviously I may do [ (right click in file tree → Show in Finder) / (right click in window title → select containing directory) ] → right click on file → Open With → "the app" — but it's too much steps.)

Answer 1

Huh, I've found it.

1. Start Automator.app.
2. Select "Service".
3. Drag-n-drop "Run AppleScript" to workflow.
4. Set "service receives" to "no input", and application is Xcode.

5. Paste this code (replace MacVim with your editor)

   tell application "Xcode"
       set current_document to last source document
       set current_document_path to path of current_document
   end tell
   
   tell application "MacVim"
       activate
       open current_document_path
   end tell
   

6. Save workflow.

7. In System Preferences → Keyboard → Keyboard Shortcuts → Services → General, assign a shortcut.
8. You're done!

I've borrowed AppleScript code from this project: Uncrustify Automator Services for Xcode 4.