From 9aed413b06212a4620641124164f6d1a7047c9c9 Mon Sep 17 00:00:00 2001
From: Thomas Beutlich <thomas.beutlich@apluss.de>
Date: Tue, 13 Aug 2024 21:13:28 +0200
Subject: [PATCH] Fix diff command to only set --strip-trailing-cr if available

---
 tests/test1.sh | 14 +++++++++++++-
 tests/test2.sh | 15 ++++++++++++++-
 tests/test3.sh | 15 ++++++++++++++-
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/tests/test1.sh b/tests/test1.sh
index c21ffbc..e73a333 100755
--- a/tests/test1.sh
+++ b/tests/test1.sh
@@ -34,7 +34,19 @@ echo -------------------------------------------------------------------------
 } > s1.out
 
 
-if result=$(diff --strip-trailing-cr "$EXPECT" "s1.out"); then
+supports_strip_trailing_cr() {
+	diff --help 2>/dev/null | grep -q -- '--strip-trailing-cr'
+}
+
+run_diff() {
+	if supports_strip_trailing_cr; then
+		diff --strip-trailing-cr "$EXPECT" "s1.out"
+	else
+		diff "$EXPECT" "s1.out"
+	fi
+}
+
+if result=$(run_diff); then
 	echo "******* Stream 1 Succeeded *********"
 	exit 0
 else
diff --git a/tests/test2.sh b/tests/test2.sh
index 9a906f9..5c3e1fb 100755
--- a/tests/test2.sh
+++ b/tests/test2.sh
@@ -12,7 +12,20 @@ for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13; do
   "${SHPDUMP:-./shpdump}" test${i}.shp
 done > "s2.out"
 
-if result=$(diff --strip-trailing-cr "$EXPECT" "s2.out"); then
+
+supports_strip_trailing_cr() {
+	diff --help 2>/dev/null | grep -q -- '--strip-trailing-cr'
+}
+
+run_diff() {
+	if supports_strip_trailing_cr; then
+		diff --strip-trailing-cr "$EXPECT" "s2.out"
+	else
+		diff "$EXPECT" "s2.out"
+	fi
+}
+
+if result=$(run_diff); then
 	echo "******* Stream 2 Succeeded *********"
 	exit 0
 else
diff --git a/tests/test3.sh b/tests/test3.sh
index 023dcdf..8067e58 100755
--- a/tests/test3.sh
+++ b/tests/test3.sh
@@ -27,7 +27,20 @@ readonly EXPECT="${1:-$SCRIPTDIR/expect3.out}"
 "${DBFDUMP:-./dbfdump}" test.dbf
 } > s3.out
 
-if result=$(diff --strip-trailing-cr "$EXPECT" "s3.out"); then
+
+supports_strip_trailing_cr() {
+	diff --help 2>/dev/null | grep -q -- '--strip-trailing-cr'
+}
+
+run_diff() {
+	if supports_strip_trailing_cr; then
+		diff --strip-trailing-cr "$EXPECT" "s3.out"
+	else
+		diff "$EXPECT" "s3.out"
+	fi
+}
+
+if result=$(run_diff); then
 	echo "******* Stream 3 Succeeded *********"
 	exit 0
 else