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teach --histogram to diff Port JGit's HistogramDiff algorithm over to C. Rough numbers (TODO) show that it is faster than its --patience cousin, as well as the default Meyers algorithm. The implementation has been reworked to use structs and pointers, instead of bitmasks, thus doing away with JGit's 2^28 line limit. We also use xdiff's default hash table implementation (xdl_hash_bits() with XDL_HASHLONG()) for convenience. Signed-off-by: Tay Ray Chuan <rctay89@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> 2011-07-12 08:10:25 +02:00			`#!/bin/sh`

			`test_description='histogram diff algorithm'`

			`. ./test-lib.sh`
			`. "$TEST_DIRECTORY"/lib-diff-alternative.sh`

			`test_diff_frobnitz "histogram"`

			`test_diff_unique "histogram"`

			`test_done`