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Instead of needing a wrapper to call the diff/merge command, simply provide the diff_cmd and merge_cmd functions for user-specified tools in the same way as we do for built-in tools. Signed-off-by: John Keeping <john@keeping.me.uk> Acked-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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