refactor/sort ~ fix cargo clippy complaint (clippy::needless_borrow)

src/uu/sort/src/check.rs

@@ -49,7 +49,7 @@ pub fn check(path: &str, settings: &GlobalSettings) -> i32 {
             let prev_last = prev_chunk.borrow_lines().last().unwrap();
             let new_first = chunk.borrow_lines().first().unwrap();
 
-            if compare_by(prev_last, new_first, &settings) == Ordering::Greater {
+            if compare_by(prev_last, new_first, settings) == Ordering::Greater {
                 if !settings.check_silent {
                     println!("sort: {}:{}: disorder: {}", path, line_idx, new_first.line);
                 }
@@ -60,7 +60,7 @@ pub fn check(path: &str, settings: &GlobalSettings) -> i32 {
 
         for (a, b) in chunk.borrow_lines().iter().tuple_windows() {
             line_idx += 1;
-            if compare_by(a, b, &settings) == Ordering::Greater {
+            if compare_by(a, b, settings) == Ordering::Greater {
                 if !settings.check_silent {
                     println!("sort: {}:{}: disorder: {}", path, line_idx, b.line);
                 }

src/uu/sort/src/chunks.rs

@@ -90,7 +90,7 @@ pub fn read(
         if buffer.len() < carry_over.len() {
             buffer.resize(carry_over.len() + 10 * 1024, 0);
         }
-        buffer[..carry_over.len()].copy_from_slice(&carry_over);
+        buffer[..carry_over.len()].copy_from_slice(carry_over);
         let (read, should_continue) = read_to_buffer(
             file,
             next_files,
@@ -110,7 +110,7 @@ pub fn read(
                     std::mem::transmute::<Vec<Line<'static>>, Vec<Line<'_>>>(lines)
                 };
                 let read = crash_if_err!(1, std::str::from_utf8(&buf[..read]));
-                parse_lines(read, &mut lines, separator, &settings);
+                parse_lines(read, &mut lines, separator, settings);
                 lines
             });
             sender.send(payload).unwrap();
@@ -194,7 +194,7 @@ fn read_to_buffer(
                             continue;
                         }
                     }
-                    let mut sep_iter = memchr_iter(separator, &buffer).rev();
+                    let mut sep_iter = memchr_iter(separator, buffer).rev();
                     let last_line_end = sep_iter.next();
                     if sep_iter.next().is_some() {
                         // We read enough lines.

src/uu/sort/src/custom_str_cmp.rs

@@ -38,7 +38,7 @@ pub fn custom_str_cmp(
 ) -> Ordering {
     if !(ignore_case || ignore_non_dictionary || ignore_non_printing) {
         // There are no custom settings. Fall back to the default strcmp, which is faster.
-        return a.cmp(&b);
+        return a.cmp(b);
     }
     let mut a_chars = a
         .chars()

src/uu/sort/src/sort.rs

@@ -400,9 +400,9 @@ impl<'a> Line<'a> {
         let line = self.line.replace('\t', ">");
         writeln!(writer, "{}", line)?;
 
-        let fields = tokenize(&self.line, settings.separator);
+        let fields = tokenize(self.line, settings.separator);
         for selector in settings.selectors.iter() {
-            let mut selection = selector.get_range(&self.line, Some(&fields));
+            let mut selection = selector.get_range(self.line, Some(&fields));
             match selector.settings.mode {
                 SortMode::Numeric | SortMode::HumanNumeric => {
                     // find out which range is used for numeric comparisons
@@ -756,7 +756,7 @@ impl FieldSelector {
     /// Get the selection that corresponds to this selector for the line.
     /// If needs_fields returned false, tokens may be None.
     fn get_selection<'a>(&self, line: &'a str, tokens: Option<&[Field]>) -> Selection<'a> {
-        let mut range = &line[self.get_range(&line, tokens)];
+        let mut range = &line[self.get_range(line, tokens)];
         let num_cache = if self.settings.mode == SortMode::Numeric
             || self.settings.mode == SortMode::HumanNumeric
         {
@@ -846,7 +846,7 @@ impl FieldSelector {
 
         match resolve_index(line, tokens, &self.from) {
             Resolution::StartOfChar(from) => {
-                let to = self.to.as_ref().map(|to| resolve_index(line, tokens, &to));
+                let to = self.to.as_ref().map(|to| resolve_index(line, tokens, to));
 
                 let mut range = match to {
                     Some(Resolution::StartOfChar(mut to)) => {
@@ -1257,11 +1257,11 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 fn output_sorted_lines<'a>(iter: impl Iterator<Item = &'a Line<'a>>, settings: &GlobalSettings) {
     if settings.unique {
         print_sorted(
-            iter.dedup_by(|a, b| compare_by(a, b, &settings) == Ordering::Equal),
-            &settings,
+            iter.dedup_by(|a, b| compare_by(a, b, settings) == Ordering::Equal),
+            settings,
         );
     } else {
-        print_sorted(iter, &settings);
+        print_sorted(iter, settings);
     }
 }
 
@@ -1277,16 +1277,16 @@ fn exec(files: &[String], settings: &GlobalSettings) -> i32 {
     } else {
         let mut lines = files.iter().map(open);
 
-        ext_sort(&mut lines, &settings);
+        ext_sort(&mut lines, settings);
     }
     0
 }
 
 fn sort_by<'a>(unsorted: &mut Vec<Line<'a>>, settings: &GlobalSettings) {
     if settings.stable || settings.unique {
-        unsorted.par_sort_by(|a, b| compare_by(a, b, &settings))
+        unsorted.par_sort_by(|a, b| compare_by(a, b, settings))
     } else {
-        unsorted.par_sort_unstable_by(|a, b| compare_by(a, b, &settings))
+        unsorted.par_sort_unstable_by(|a, b| compare_by(a, b, settings))
     }
 }