Initial implementation of diff rename detection

This implements the basis for diff rename and copy detection,
although it is based on simple SHA comparison right now instead
of using a matching algortihm.  Just as `git_diff_merge` can be
used as a post-pass on diffs to emulate certain command line
behaviors, there is a new API `git_diff_detect` which will
update a diff list in-place, adjusting some deltas to RENAMED
or COPIED state (and also, eventually, splitting MODIFIED deltas
where the change is too large into DELETED/ADDED pairs).

This also adds a new test repo that will hold rename/copy/split
scenarios.  Right now, it just has exact-match rename and copy,
but the tests are written to use tree diffs, so we should be able
to add new test scenarios easily without breaking tests.

1 files changed, 6 insertions, 6 deletions

diff --git a/tests-clar/diff/index.c b/tests-clar/diff/index.c
index 7c4bddb90..eda8f066a 100644
--- a/tests-clar/diff/index.c
+++ b/tests-clar/diff/index.c
@@ -45,9 +45,9 @@ void test_diff_index__0(void)
 	 * - mv .git .gitted
 	 */
 	cl_assert_equal_i(8, exp.files);
-	cl_assert_equal_i(3, exp.file_adds);
-	cl_assert_equal_i(2, exp.file_dels);
-	cl_assert_equal_i(3, exp.file_mods);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(8, exp.hunks);
 
@@ -73,9 +73,9 @@ void test_diff_index__0(void)
 	 * - mv .git .gitted
 	 */
 	cl_assert_equal_i(12, exp.files);
-	cl_assert_equal_i(7, exp.file_adds);
-	cl_assert_equal_i(2, exp.file_dels);
-	cl_assert_equal_i(3, exp.file_mods);
+	cl_assert_equal_i(7, exp.file_status[GIT_DELTA_ADDED]);
+	cl_assert_equal_i(2, exp.file_status[GIT_DELTA_DELETED]);
+	cl_assert_equal_i(3, exp.file_status[GIT_DELTA_MODIFIED]);
 
 	cl_assert_equal_i(12, exp.hunks);