Clippy suggestions

.github/workflows/code-quality.yml

@@ -121,7 +121,7 @@ jobs:
       run: |
         ## `cargo clippy` lint testing
         unset fault
-        CLIPPY_FLAGS="-W clippy::default_trait_access -W clippy::manual_string_new -W clippy::cognitive_complexity -W clippy::implicit_clone"
+        CLIPPY_FLAGS="-W clippy::default_trait_access -W clippy::manual_string_new -W clippy::cognitive_complexity -W clippy::implicit_clone -W clippy::range-plus-one -W clippy::redundant-clone"
         fault_type="${{ steps.vars.outputs.FAULT_TYPE }}"
         fault_prefix=$(echo "$fault_type" | tr '[:lower:]' '[:upper:]')
         # * convert any warnings to GHA UI annotations; ref: <https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-a-warning-message>

src/uu/cp/src/cp.rs

@@ -1622,7 +1622,7 @@ fn aligned_ancestors<'a>(source: &'a Path, dest: &'a Path) -> Vec<(&'a Path, &'a
     // Get the matching number of elements from the ancestors of the
     // destination path (for example, get "d/a" and "d/a/b").
     let k = source_ancestors.len();
-    let dest_ancestors = &dest_ancestors[1..1 + k];
+    let dest_ancestors = &dest_ancestors[1..=k];
 
     // Now we have two slices of the same length, so we zip them.
     let mut result = vec![];

src/uu/nl/src/helper.rs

@@ -36,7 +36,7 @@ pub fn parse_options(settings: &mut crate::Settings, opts: &clap::ArgMatches) ->
     {
         None => {}
         Some(Ok(style)) => settings.header_numbering = style,
-        Some(Err(message)) => errs.push(message.to_string()),
+        Some(Err(message)) => errs.push(message),
     }
     match opts
         .get_one::<String>(options::BODY_NUMBERING)
@@ -45,7 +45,7 @@ pub fn parse_options(settings: &mut crate::Settings, opts: &clap::ArgMatches) ->
     {
         None => {}
         Some(Ok(style)) => settings.body_numbering = style,
-        Some(Err(message)) => errs.push(message.to_string()),
+        Some(Err(message)) => errs.push(message),
     }
     match opts
         .get_one::<String>(options::FOOTER_NUMBERING)
@@ -54,7 +54,7 @@ pub fn parse_options(settings: &mut crate::Settings, opts: &clap::ArgMatches) ->
     {
         None => {}
         Some(Ok(style)) => settings.footer_numbering = style,
-        Some(Err(message)) => errs.push(message.to_string()),
+        Some(Err(message)) => errs.push(message),
     }
     match opts.get_one::<usize>(options::NUMBER_WIDTH) {
         None => {}

src/uu/numfmt/src/format.rs

@@ -53,11 +53,7 @@ impl<'a> Iterator for WhitespaceSplitter<'a> {
                 .unwrap_or(haystack.len()),
         );
 
-        let (field, rest) = field.split_at(
-            field
-                .find(|c: char| c.is_whitespace())
-                .unwrap_or(field.len()),
-        );
+        let (field, rest) = field.split_at(field.find(char::is_whitespace).unwrap_or(field.len()));
 
         self.s = if rest.is_empty() { None } else { Some(rest) };
 
@@ -107,7 +103,7 @@ fn parse_implicit_precision(s: &str) -> usize {
     match s.split_once('.') {
         Some((_, decimal_part)) => decimal_part
             .chars()
-            .take_while(|c| c.is_ascii_digit())
+            .take_while(char::is_ascii_digit)
             .count(),
         None => 0,
     }

src/uu/sort/src/numeric_str_cmp.rs

@@ -221,8 +221,8 @@ pub fn numeric_str_cmp((a, a_info): (&str, &NumInfo), (b, b_info): (&str, &NumIn
         a_info.exponent.cmp(&b_info.exponent)
     } else {
         // walk the characters from the front until we find a difference
-        let mut a_chars = a.chars().filter(|c| c.is_ascii_digit());
-        let mut b_chars = b.chars().filter(|c| c.is_ascii_digit());
+        let mut a_chars = a.chars().filter(char::is_ascii_digit);
+        let mut b_chars = b.chars().filter(char::is_ascii_digit);
         loop {
             let a_next = a_chars.next();
             let b_next = b_chars.next();

src/uu/sort/src/sort.rs

@@ -985,7 +985,7 @@ impl FieldSelector {
                 let mut range = match to {
                     Some(Resolution::StartOfChar(mut to)) => {
                         // We need to include the character at `to`.
-                        to += line[to..].chars().next().map_or(1, |c| c.len_utf8());
+                        to += line[to..].chars().next().map_or(1, char::len_utf8);
                         from..to
                     }
                     Some(Resolution::EndOfChar(to)) => from..to,

src/uu/split/src/split.rs

@@ -918,8 +918,7 @@ impl<'a> Write for LineChunkWriter<'a> {
             // Write the line, starting from *after* the previous
             // separator character and ending *after* the current
             // separator character.
-            let num_bytes_written =
-                custom_write(&buf[prev..i + 1], &mut self.inner, self.settings)?;
+            let num_bytes_written = custom_write(&buf[prev..=i], &mut self.inner, self.settings)?;
             total_bytes_written += num_bytes_written;
             prev = i + 1;
             self.num_lines_remaining_in_current_chunk -= 1;
@@ -1090,7 +1089,7 @@ impl<'a> Write for LineBytesChunkWriter<'a> {
                 // example comment above.)
                 Some(i) if i < self.num_bytes_remaining_in_current_chunk => {
                     let num_bytes_written =
-                        custom_write(&buf[..i + 1], &mut self.inner, self.settings)?;
+                        custom_write(&buf[..=i], &mut self.inner, self.settings)?;
                     self.num_bytes_remaining_in_current_chunk -= num_bytes_written;
                     total_bytes_written += num_bytes_written;
                     buf = &buf[num_bytes_written..];

src/uu/uniq/src/uniq.rs

@@ -160,7 +160,7 @@ impl Uniq {
 
             // fast path: avoid skipping
             if self.ignore_case && slice_start == 0 && slice_stop == len {
-                return closure(&mut fields_to_check.chars().flat_map(|c| c.to_uppercase()));
+                return closure(&mut fields_to_check.chars().flat_map(char::to_uppercase));
             }
 
             // fast path: we can avoid mapping chars to upper-case, if we don't want to ignore the case
@@ -173,7 +173,7 @@ impl Uniq {
                     .chars()
                     .skip(slice_start)
                     .take(slice_stop)
-                    .flat_map(|c| c.to_uppercase()),
+                    .flat_map(char::to_uppercase),
             )
         } else {
             closure(&mut fields_to_check.chars())

src/uu/wc/src/wc.rs

@@ -190,7 +190,7 @@ impl<'a> Inputs<'a> {
 
         // The 1-based index of each yielded item must be tracked for error reporting.
         let mut with_idx = base.enumerate().map(|(i, v)| (i + 1, v));
-        let files0_from_path = settings.files0_from.as_ref().map(|p| p.as_borrowed());
+        let files0_from_path = settings.files0_from.as_ref().map(Input::as_borrowed);
 
         let iter = iter::from_fn(move || {
             let (idx, next) = with_idx.next()?;

src/uucore/src/lib/parser/parse_size.rs

@@ -90,9 +90,9 @@ impl<'parser> Parser<'parser> {
             NumberSystem::Hexadecimal => size
                 .chars()
                 .take(2)
-                .chain(size.chars().skip(2).take_while(|c| c.is_ascii_hexdigit()))
+                .chain(size.chars().skip(2).take_while(char::is_ascii_hexdigit))
                 .collect(),
-            _ => size.chars().take_while(|c| c.is_ascii_digit()).collect(),
+            _ => size.chars().take_while(char::is_ascii_digit).collect(),
         };
         let mut unit: &str = &size[numeric_string.len()..];
 
@@ -243,7 +243,7 @@ impl<'parser> Parser<'parser> {
 
         let num_digits: usize = size
             .chars()
-            .take_while(|c| c.is_ascii_digit())
+            .take_while(char::is_ascii_digit)
             .collect::<String>()
             .len();
         let all_zeros = size.chars().all(|c| c == '0');