Merge pull request #3281 from jfinkels/split-round-robin

split: implement round-robin arg to --number

tests/by-util/test_split.rs

@@ -743,3 +743,19 @@ fn test_hex_suffix() {
     assert_eq!(at.read("x0b"), "c");
     assert_eq!(at.read("x0c"), "");
 }
+
+#[test]
+fn test_round_robin() {
+    let (at, mut ucmd) = at_and_ucmd!();
+
+    let file_read = |f| {
+        let mut s = String::new();
+        at.open(f).read_to_string(&mut s).unwrap();
+        s
+    };
+
+    ucmd.args(&["-n", "r/2", "fivelines.txt"]).succeeds();
+
+    assert_eq!(file_read("xaa"), "1\n3\n5\n");
+    assert_eq!(file_read("xab"), "2\n4\n");
+}