David Aguilar [off-list ref] writes:
What if instead of global state, maybe the user could specify a path
that difftool could skip forward to? For example, we could teach
difftool to resume by telling it where we last left off:
git difftool --resume-from=foo/bar099.txt
Then we don't need the global counter state file?
Does it have to be the second and subsequent invocation to pass the
new "resume-from" option? As we do not have "global" state, I would
presume that we do not even know if it is the first invocation, so
perhaps a better name would be "--start-from=$pathname"?
Finally, I'm going to plug what I believe to be the right tool for the
job here. Have you tried git cola?[1] Difftool is tightly
integrated, and the UI is such that you can trivially choose any of
the modified/staged files and difftool them by using the Ctrl-d
hotkey.
https://github.com/git-cola/git-cola/
Cola is purpose-built for driving difftool, and for interactive
staging, so not mentioning it in the context of wanting a better UI
for difftool would be a disservice to difftool users.
;-)