Although this package diptest has been created a long time ago, with a
first CRAN publication in 2003, see the official page of
CRAN package diptest, the
package development sources and history have only been made available on
Nov.30, 2020.
As with my R package sfsmisc, I was
able to keep most of the editing and development history of this package,
using my emacs backup files (*.~)
together with some RCS (*,v) histories, using my G2RCSn shell script,
and most importantly a ruby script to create a git repos including
history, see here, for how it worked with sfsmisc:
https://mmaechler.blogspot.com/2014/08/how-i-got-175-years-old-github.html