[PATCH on en/rename-progress v2] diffcore-rename: make diff-tree -l0 mean -l<large>

In the documentation of diff-tree, it is stated that the -l option
"prevents rename/copy detection from running if the number of
rename/copy targets exceeds the specified number". The documentation
does not mention any special handling for the number 0, but the
implementation before commit 9f7e4bfa3b ("diff: remove silent clamp of
renameLimit", 2017-11-13) treated 0 as a special value indicating that
the rename limit is to be a very large number instead.

The commit 9f7e4bfa3b changed that behavior, treating 0 as 0. Revert
this behavior to what it was previously. This allows existing scripts
and tools that use "-l0" to continue working. The alternative (to have
"-l0" suppress rename detection) is probably much less useful, since
users can just refrain from specifying -M and/or -C to have the same
effect.

Signed-off-by: Jonathan Tan <redacted>
---
There are multiple issues with the commit message, so I am sending this
new version out.

v2 is exactly the same as previously, except that the commit message is
changed following Elijah Newren's and Jonathan Nieder's comments.
---
 diffcore-rename.c      |  2 ++
 t/t4001-diff-rename.sh | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/diffcore-rename.c b/diffcore-rename.c
index 9ca0eaec7..245e999fe 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c

@@ -392,6 +392,8 @@ static int too_many_rename_candidates(int num_create,
 	 *
 	 *    num_create * num_src > rename_limit * rename_limit
 	 */
+	if (rename_limit <= 0)
+		rename_limit = 32767;
 	if ((num_create <= rename_limit || num_src <= rename_limit) &&
 	    ((uint64_t)num_create * (uint64_t)num_src
 	     <= (uint64_t)rename_limit * (uint64_t)rename_limit))

diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index 0d1fa45d2..eadf4f624 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh

@@ -230,4 +230,19 @@ test_expect_success 'rename pretty print common prefix and suffix overlap' '
 	test_i18ngrep " d/f/{ => f}/e " output
 '
 
+test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
+	test_write_lines line1 line2 line3 >myfile &&
+	git add myfile &&
+	git commit -m x &&
+
+	test_write_lines line1 line2 line4 >myotherfile &&
+	git rm myfile &&
+	git add myotherfile &&
+	git commit -m x &&
+
+	git diff-tree -M -l0 HEAD HEAD^ >actual &&
+	# Verify that a rename from myotherfile to myfile was detected
+	grep "myotherfile.*myfile" actual
+'
+
 test_done

-- 
2.15.0.173.g9268cf4a2.dirty