I want to tweak the Adwaita gtk3 theme a bit, and I found it here.There are two many files to download, and I had no luck using neither git clone https://git.gnome.org/browse/gtk+/tree/gtk/theme/Adwaita nor svn export https://git.gnome.org/browse/gtk+/tree/gtk/theme/AdwaitaI'm sure that there is a way to download this dir, as I saw a guy using Adwaita theme as a base: Arc-themeSo any of you know how to download a git.gnome.org sub dir? Thank you very much for checking my issue out!Edit 1: Answer provided by don_crissti can do the job well (I wanted to comment a thank to his post but got advised not to do that), however, if you can't install subversion, e.g. don't have root access, you can download gtk+3 source package here (at Download). It's only 10 MiB (as of ver 3.16.5).
How to download a sub directory on git.gnome.org?
git;gtk3
You can get it with svn from https:/github.com/GNOME (svn checkout URL is available on the right side of the page). So, to get just the Adwaita sub-directory simply run:svn checkout https://github.com/GNOME/gtk/trunk/gtk/theme/Adwaita