Sort: More small fixes (#2065)

* Various fixes and performance improvements

* fix a typo

Co-authored-by: Michael Debertol <michael.debertol@gmail.com>

* Fix month parse for months with leading whitespace

* Implement test for months whitespace fix

* Confirm human numeric works as expected with whitespace with a test

* Correct arg help value name for --parallel

* Fix SemVer non version lines/empty line sorting with a test

Co-authored-by: Sylvestre Ledru <sledru@mozilla.com>
Co-authored-by: Michael Debertol <michael.debertol@gmail.com>

tests/by-util/test_sort.rs

@@ -8,6 +8,25 @@ fn test_helper(file_name: &str, args: &str) {
         .stdout_is_fixture(format!("{}.expected", file_name));
 }
 
+#[test]
+fn test_months_whitespace() {
+    test_helper("months-whitespace", "-M");
+}
+
+#[test]
+fn test_version_empty_lines() {
+    new_ucmd!()
+    .arg("-V")
+    .arg("version-empty-lines.txt")
+    .succeeds()
+    .stdout_is("\n\n\n\n\n\n\n1.2.3-alpha\n1.2.3-alpha2\n\t\t\t1.12.4\n11.2.3\n");
+}
+
+#[test]
+fn test_human_numeric_whitespace() {
+    test_helper("human-numeric-whitespace", "-h");
+}
+
 #[test]
 fn test_multiple_decimals_general() {
     new_ucmd!()

tests/fixtures/sort/human-numeric-whitespace.expected

@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+456K
+4568K
+			456M
+              6.2G

tests/fixtures/sort/human-numeric-whitespace.txt

@@ -0,0 +1,11 @@
+
+
+456K
+
+			456M
+
+
+4568K
+
+              6.2G
+

tests/fixtures/sort/months-whitespace.expected

@@ -0,0 +1,8 @@
+
+
+JAN
+  FEb
+ apr
+ apr
+			JUNNNN
+AUG 

tests/fixtures/sort/months-whitespace.txt

@@ -0,0 +1,8 @@
+JAN
+			JUNNNN
+AUG 
+
+ apr
+ apr
+
+  FEb

tests/fixtures/sort/version-empty-lines.expected

@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+1.2.3-alpha
+1.2.3-alpha2
+11.2.3
+			1.12.4

tests/fixtures/sort/version-empty-lines.txt

@@ -0,0 +1,11 @@
+11.2.3
+
+
+
+1.2.3-alpha2
+
+
+1.2.3-alpha
+
+
+			1.12.4