Here [0] it is! The very very first version of archgems.It creates/updates an arch repo with some help from the rubygems API. You can put a list of gems in a config a it will populate your repo with all deps.
The first few tests worked quite well, but there are some issues like the missing integrity check of the source files.
For testers: The config file is expected in ~/.config/archgems cheers, ushi [0] https://github.com/ushis/archgems