drush-ops/drush — pull request #42 by greg-1-anderson (2013-08-27 17:34:40+00:00)
Title: Fix __drush_ps1 so that prompt is cleared after unuse.

The problem with the current code is that the DRUSH_SITE environment variable persists, even after the file is removed. This version insures that the prompt disappears when the file does.