range-diff: first rudimentary implementation
At this stage, `git range-diff` can determine corresponding commits
of two related commit ranges. This makes use of the recently introduced
implementation of the linear assignment algorithm.
The core of this patch is a straight port of the ideas of tbdiff, the
apparently dormant project at https://github.com/trast/tbdiff.
The output does not at all match `tbdiff`'s output yet, as this patch
really concentrates on getting the patch matching part right.
Note: due to differences in the diff algorithm (`tbdiff` uses the Python
module `difflib`, Git uses its xdiff fork), the cost matrix calculated
by `range-diff` is different (but very similar) to the one calculated
by `tbdiff`. Therefore, it is possible that they find different matching
commits in corner cases (e.g. when a patch was split into two patches of
roughly equal length).
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/range-diff.h b/range-diff.h
new file mode 100644
index 0000000..7b6eef3
--- /dev/null
+++ b/range-diff.h
@@ -0,0 +1,7 @@
+#ifndef RANGE_DIFF_H
+#define RANGE_DIFF_H
+
+int show_range_diff(const char *range1, const char *range2,
+ int creation_factor);
+
+#endif
