Zenphoto
The simpler media website CMS
ZenphotoThe simpler media website CMS
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Comments
Why would you want that, out of curiosity?
In most cases, if you do your mods right, you won't have to change that much. My suggestion? Try to avoid editing the core files as much as possible. I've managed to get all my mods going using just a customfunctions.php file with the exception of watermarking which required a slight addition to the i.php file. All of your hacks, mods, etc. should be contained as much as possible in your custom theme directory, and then all you have to do is make sure that you "port" your theme to the new version if things don't work right when you upgrade. If your custom theme doesn't work, at least you can use another default theme until you fix the errors.
With that said, you can also consider using SVN. I am learning about it as I go along, and it's pretty sweet for doing exactly what you are talking about. If you set it up right, it will only replace what you need it to.
Also, you should be keeping all your mods in your theme directory as noted, and including a PHP file into your theme, which you have full control over. Mods for i.php are a bit more tricky, but you'd have to redo them anyway as i.php is changed in nearly every release.
So it wouldn't be much help anyway - just think, the files you want to hack are probably exactly the files I'm going to change the most :-)