Automatically change ediff options based on mode?

Hi all. Long-time (30+ years) emacs user but not a programmer so can only do simple elisp functions. I use ediff all the time and have ediff-diff-options set to -wBb. This works most of the time but I've gotten burned diff-ing some Python scripts and the occasional makefile since whitespace matters there. Anyone have some code that would automatically change ediff-diff-options based on the buffer mode? I guess that means it would have to be a local setting. Thanks for any pointers / ideas!

Idk what ediff is but use hooks and setq-local

Something like this: (add-hook 'python-mode-hook #'(lambda () (setq-local thing (concat "command" some-variable))))

Thanks. I see where you're going but it really needs to add-hook to ediff-mode-hook which somehow needs to change ediff-diff-options before calling ediff-diff-program (which is usually diff). Ediff is about a dozen elisp files under the vc (version control) built-in package (along with cvs-\* and vc-\*). Probably way too complex for me to figure out but I'll try if I can't get any outside help. I'm surprised anyone programming in emacs doesn't use ediff all the time but upon reflection, I guess most folks (not including me) use git and its associated utilities so vc is not too popular anymore.

https://emacs.stackexchange.com/q/73500/105

You can probably use `ediff-prepare-buffer-hook`. > Hooks run after buffers A, B, and C are set up. > For each buffer, the hooks are run with that buffer made current. This happens before `ediff-exec-process` runs. Alternatively, `ediff-keymap-setup-hook` -- which sounds like a weird option, but it only runs once instead of once per buffer, and you would have access to all of `ediff-buffer-A`, `ediff-buffer-B`, and `ediff-buffer-C` (and `ediff-control-buffer`, which should be current at that time). I'm not seeing anything more appropriate offhand -- maybe it would be a good feature request.