Documentation / technical / api-xdiff-interface.txton commit add reentrant variants of sha1_to_hex and find_unique_abbrev (af49c6d)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)