composer/composer — pull request #3571 by gohanman (2014-12-18 20:39:21+00:00)
Title: Search command option -R / --repo to restrict search to single repository

I find it useful when dealing with a number of VCS repositories. More often than not each VCS repo is providing a single dependency. Redownloading package lists for all the repos can create a noticeable hang when all I really want to search is packagist.