Fix "git log --diff-filter" bug

In commit b7bb760d5ed4881422673d32f869d140221d3564 (Fix revision
log diff setup, avoid unnecessary diff generation) an optimization was
made to avoid unnecessary diff generation.  This was partly fixed in
99516e35d096f41e7133cacde8fbed8ee9a3ecd0 (Fix embarrassing "git log
--follow" bug).  The '--diff-filter' option also needs the diff machinery
in action.

Signed-off-by: Arjen Laarhoven <arjen@yaph.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/t/t4202-log.sh b/t/t4202-log.sh
new file mode 100755
index 0000000000..b53645417b
--- /dev/null
+++ b/t/t4202-log.sh
@@ -0,0 +1,74 @@
+#!/bin/sh
+
+test_description='git log'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+
+	echo one >one &&
+	git add one &&
+	test_tick &&
+	git commit -m initial &&
+
+	echo ichi >one &&
+	git add one &&
+	test_tick &&
+	git commit -m second &&
+
+	mkdir a &&
+	echo ni >a/two &&
+	git add a/two &&
+	test_tick &&
+	git commit -m third &&
+
+	echo san >a/three &&
+	git add a/three &&
+	test_tick &&
+	git commit -m fourth &&
+
+	git rm a/three &&
+	test_tick &&
+	git commit -m fifth
+
+'
+
+test_expect_success 'diff-filter=A' '
+
+	actual=$(git log --pretty="format:%s" --diff-filter=A HEAD) &&
+	expect=$(echo fourth ; echo third ; echo initial) &&
+	test "$actual" = "$expect" || {
+		echo Oops
+		echo "Actual: $actual"
+		false
+	}
+
+'
+
+test_expect_success 'diff-filter=M' '
+
+	actual=$(git log --pretty="format:%s" --diff-filter=M HEAD) &&
+	expect=$(echo second) &&
+	test "$actual" = "$expect" || {
+		echo Oops
+		echo "Actual: $actual"
+		false
+	}
+
+'
+
+test_expect_success 'diff-filter=D' '
+
+	actual=$(git log --pretty="format:%s" --diff-filter=D HEAD) &&
+	expect=$(echo fifth) &&
+	test "$actual" = "$expect" || {
+		echo Oops
+		echo "Actual: $actual"
+		false
+	}
+
+'
+
+
+
+test_done
\ No newline at end of file