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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: How to get the list of modified files in VC?
Date: Tue, 25 Jul 2017 17:26:50 +0300
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> From: Marcin Borkowski <mbork@mbork.pl>
> Date: Tue, 25 Jul 2017 07:32:50 +0200
> 
> I'm writing some code on top of VC.  I'd need to get the list of
> modified files in the current repository.  How do I do that (other than
> firing git as an external process)?

I suggest to look at what vc-dir-refresh does, I'm sure some variant
of that is what you want.  The back-end call 'dir-status-files' is the
backbone of this.