laravel exception handler open emacs file
- laravel:
- .env: APP_EDITOR=emacs
- config/app.php: 'editor' => env('APP_EDITOR'),
- https://superuser.com/questions/162092/how-can-i-register-a-custom-protocol-with-xdg
- https://github.com/filp/whoops/blob/master/docs/Open%20Files%20In%20An%20Editor.md
