A diff is a utility that shows you the differences between two files. Most of them overwhelm you with insignificant changes, such as an extra space after an open parentheses. An ideal diff would be aware of the language and:
Tortoise Subversion has a primitive diff for comparing revisions in the source code repository.
I mainly use DiffZilla, part of an old Visual Slick Edit version 6. It lets you notice the differences and copy lines between the files to make them more alike, or manually edit either file as you diff. It is not clever about spaces or rearranging. It is clever about differing line-ending conventions, however.
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