skel-complete generates bare-bones bash completion files for a given command, produced by pulling out options from the man page. It's basically a toy, and it relies on one hell of a regular expression.
Grab skel-complete and place it somewhere in your PATH. You'll need Ruby.
$ skel-complete <command> > ~/etc/<command>-completion.bash
$ . ~/etc/<command>-completion.bash
e.g., if <command> is rsync:
$ skel-complete rsync > ~/etc/rsync-completion.bash
$ . ~/etc/rsync-completion.bash
After that, rsync --vers<TAB> will tab complete, as will any other option successfully retrieved from the man page of <command>.
Copyright (c) 2011 Adam Prescott. Released under the MIT license. See the license file.
Drop the Ruby dependency.