cut: fix -d$'\n' --output-delimiter=@@ behavior

function                                             old     new   delta
cut_main                                            1261    1353     +92
packed_usage                                       34925   34901     -24
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 92/-24)             Total: 68 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/testsuite/cut.tests b/testsuite/cut.tests
index ba5f88d60..8da390cd7 100755
--- a/testsuite/cut.tests
+++ b/testsuite/cut.tests
@@ -116,4 +116,30 @@ testing "cut non-existing field" "cut -d ':' -f1,3" \
         "1\n" \
         "" "1:\n"
 
+# cut -d$'\n' has a special meaning: "select input lines".
+# I didn't find any documentation for this feature.
+testing "cut -dNEWLINE" \
+        "cut -d'
+' -f4,2,6-8" \
+        "2\n4\n6\n7\n" \
+        "" "1\n2\n3\n4\n5\n6\n7"
+
+testing "cut -dNEWLINE --output-delimiter" \
+        "cut -d'
+' -O@@ -f4,2,6-8" \
+        "2@@4@@6@@7\n" \
+        "" "1\n2\n3\n4\n5\n6\n7"
+
+testing "cut -dNEWLINE --output-delimiter 2" \
+        "cut -d'
+' -O@@ -f4,2,6-8" \
+        "2@@4@@6@@7\n" \
+        "" "1\n2\n3\n4\n5\n6\n7\n"
+
+testing "cut -dNEWLINE --output-delimiter EMPTY_INPUT" \
+        "cut -d'
+' -O@@ -f4,2,6-8" \
+        "" \
+        "" ""
+
 exit $FAILCOUNT