perf completion: Factor out compgen stuff
compgen is a bash-builtin; factor out the invocations into a separate function to give us a chance to override it with a zsh equivalent in future patches. Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/r/1384704807-15779-3-git-send-email-artagnon@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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