git - Is there a diff & patch for large cut & pastes -

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is there tool/workflow making diff+patch operation "commute" large cut & pastes operation between text files?

we've 3 files source.old, source.new, , destination. copied several text hunks source.old destination, otherwise these files have shared history. we've since edited source.old produce source.new , suspect changes appearing in copied hunks relevant destination.

we first automatically identify copy & pastes either using copy & paste detecting tool or specifying specific git commits representing paste operations on destination. copy & paste edited copy, should describe copy & paste operations using diff-like context both source.old , destination, , provide diff each copied hunks.

we next create patch file representing changes source.old source.new occur within copied hunks, necessary replace context source.old context destination, , reorder hunks match destination. apply patch interactively picking relevant changes.

is there easy way using diff & patch tools? if we're talking cut & paste operations source , destination live in same repository, presumably such tools must exist since 1 might split file multiple shorter files. i've been careful spin down working branches before sort of restructuring, presumably git handles such cross file changes okay. doing manually when source , destination live in unrelated repositories?

try unix's diff , patch, works diff's output. seems it'll want.


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