format-patch: extend --range-diff to accept revision range
When submitting a revised a patch series, the --range-diff option embeds
a range-diff in the cover letter showing changes since the previous
version of the patch series. The argument to --range-diff is a simple
revision naming the tip of the previous series, which works fine if the
previous and current versions of the patch series share a common base.
However, it fails if the revision ranges of the old and new versions of
the series are disjoint. To address this shortcoming, extend
--range-diff to also accept an explicit revision range for the previous
series. For example:
git format-patch --cover-letter --range-diff=v1~3..v1 -3 v2
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t3206-range-diff.sh b/t/t3206-range-diff.sh
index dd854b6..3d7a2d8 100755
--- a/t/t3206-range-diff.sh
+++ b/t/t3206-range-diff.sh
@@ -142,7 +142,7 @@
test_cmp expected actual
'
-for prev in topic
+for prev in topic master..topic
do
test_expect_success "format-patch --range-diff=$prev" '
git format-patch --stdout --cover-letter --range-diff=$prev \
