Re: Remove old forgotten command: whatchanged

quoted

The above section primarily explains the use of diff-tree and it was
appropriate back when git-whatchanged was a script.  The intent of
the whole document, not just this section, was to tickle the
curiousity of the users and encourage them to see how the above
"much more powerful" whatchanged was implemented by going to the
source.

Well in this case you can say that the intent was successful since it made
me read the source code ;)

No, it is a failure. "By going to the source" was meant for
"git-whatchanged.sh" source,
a scripted version of Porcelain, so that users can mimic what is done
in their script.

Reading C source would not help them.