Using Git diff to detect code movement + How to use diff options

Question

Consider that a file (1.c) contains three functions and changes made by authors M and J. If someone runs git blame 1.c, he will get the following output:

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Answer 1

In this particular case, I don't think git diff is concerned about detecting code movement; rather, it's simply creating a patch that can be applied to transform the old file into the new file, which is what your git diff output plainly shows - the function is being deleted from one location and inserted in another. There are probably more succinct ways to output a series of edit commands that move code from one location to another, but I think git might be erring on the side of portability here - there's no guarantee the end user wound always use git apply or git am, so the patch is produced in a format that can be used even with plain patch.