This is a extension of Emacs that provide the functions of auto-complete for handling Programmable Completion.
You can define the source of auto-complete.el to handle pcomplete.

• ac-pcmp/get-ac-candidates
• ac-pcmp/do-ac-action
• ac-pcmp/self-insert-command-with-ac-start

(defvar ac-source-xxxx
  '((candidates . ac-pcmp/get-ac-candidates)
    (prefix . "xxxx \\(.*\\)")
    (symbol . "x")
    (requires . 0)
    (cache)
    (action . ac-pcmp/do-ac-action)))

2014/02/27 It's available by using melpa.

2014/03/03 It's available. But, master branch only.

(auto-install-from-url "https://raw.github.com/aki2o/auto-complete-pcmp/master/auto-complete-pcmp.el")

• In this case, you need to install each of the following dependency.

Download auto-complete-pcmp.el and put it on your load-path.

• In this case, you need to install each of the following dependency.

• Emacs … GNU Emacs 24.3.1 (i686-pc-linux-gnu, GTK+ Version 3.4.2) of 2013-08-22 on chindi02, modified by Debian
• auto-complete.el … 1.4.0
• log4e.el … 0.2.0
• yaxception.el … 0.1

Enjoy!!!