[PATCH v4 7/8] t4124: fix test for non-compliant diff(1)

["Đoàn Trần Công Danh" <congdanhqx@gmail.com>]

POSIX's diff(1) requires output in normal diff format.
However, busybox's diff's output is written in unified format.

HP-UX's diff(1) doesn't understand "-u" as of now.

Workaround this problem by checking "diff -u" output,
if we couldn't make anything from normal-diff format.

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 t/t4124-apply-ws-rule.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/t/t4124-apply-ws-rule.sh b/t/t4124-apply-ws-rule.sh
index 971a5a7512..4a1bb141d9 100755
--- a/t/t4124-apply-ws-rule.sh
+++ b/t/t4124-apply-ws-rule.sh
@@ -52,6 +52,12 @@ test_fix () {
 
 	# find touched lines
 	$DIFF file target | sed -n -e "s/^> //p" >fixed
+	# busybox's diff(1) doesn't output normal format
+	if ! test -s fixed; then
+		$DIFF -u file target |
+		grep -v '^+++ target' |
+		sed -ne "/^+/s/+//p" >fixed
+	fi
 
 	# the changed lines are all expected to change
 	fixed_cnt=$(wc -l <fixed)
-- 
2.26.0.rc2.357.g1e1ba0441d