On Wed, 27 May 2015, Jeff King wrote:
If you are interested in looking further, see how the %patch_mode hash is defined in git-add--interactive.perl. Specifically, note that "add -p" is just one case: diff against the index and apply with "apply --cached". But once you have a separate tool for picking hunks, you should be able to drop in the different DIFF/APPLY pairs to implement "checkout -p", etc.
My plan was to use symlinks, checkout-index, and update-index --index-info, similar to how difftool does it. I verified on the command line that that seems to work.
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