clippy: fix clippy warnings

src/uu/chcon/src/chcon.rs

@@ -727,7 +727,7 @@ fn get_root_dev_ino() -> Result<DeviceAndINode> {
 }
 
 fn root_dev_ino_check(root_dev_ino: Option<DeviceAndINode>, dir_dev_ino: DeviceAndINode) -> bool {
-    root_dev_ino.map_or(false, |root_dev_ino| root_dev_ino == dir_dev_ino)
+    root_dev_ino == Some(dir_dev_ino)
 }
 
 fn root_dev_ino_warn(dir_name: &Path) {

src/uu/du/src/du.rs

@@ -533,7 +533,7 @@ impl StatPrinter {
 
                         if !self
                             .threshold
-                            .map_or(false, |threshold| threshold.should_exclude(size))
+                            .is_some_and(|threshold| threshold.should_exclude(size))
                             && self
                                 .max_depth
                                 .map_or(true, |max_depth| stat_info.depth <= max_depth)

src/uu/fold/src/fold.rs

@@ -99,7 +99,7 @@ pub fn uu_app() -> Command {
 fn handle_obsolete(args: &[String]) -> (Vec<String>, Option<String>) {
     for (i, arg) in args.iter().enumerate() {
         let slice = &arg;
-        if slice.starts_with('-') && slice.chars().nth(1).map_or(false, |c| c.is_ascii_digit()) {
+        if slice.starts_with('-') && slice.chars().nth(1).is_some_and(|c| c.is_ascii_digit()) {
             let mut v = args.to_vec();
             v.remove(i);
             return (v, Some(slice[1..].to_owned()));

src/uu/split/src/split.rs

@@ -492,7 +492,7 @@ impl Settings {
                 }
                 match first.as_str() {
                     "\\0" => b'\0',
-                    s if s.as_bytes().len() == 1 => s.as_bytes()[0],
+                    s if s.len() == 1 => s.as_bytes()[0],
                     s => return Err(SettingsError::MultiCharacterSeparator(s.to_string())),
                 }
             }

src/uu/tac/src/tac.rs

@@ -184,7 +184,7 @@ fn buffer_tac(data: &[u8], before: bool, separator: &str) -> std::io::Result<()>
     let mut out = BufWriter::new(out.lock());
 
     // The number of bytes in the line separator.
-    let slen = separator.as_bytes().len();
+    let slen = separator.len();
 
     // The index of the start of the next line in the `data`.
     //

src/uu/tail/src/args.rs

@@ -336,11 +336,11 @@ impl Settings {
             let blocking_stdin = self.pid == 0
                 && self.follow == Some(FollowMode::Descriptor)
                 && self.num_inputs() == 1
-                && Handle::stdin().map_or(false, |handle| {
+                && Handle::stdin().is_ok_and(|handle| {
                     handle
                         .as_file()
                         .metadata()
-                        .map_or(false, |meta| !meta.is_file())
+                        .is_ok_and(|meta| !meta.is_file())
                 });
 
             if !blocking_stdin && std::io::stdin().is_terminal() {

src/uu/tail/src/paths.rs

@@ -93,7 +93,7 @@ impl Input {
     pub fn is_tailable(&self) -> bool {
         match &self.kind {
             InputKind::File(path) => path_is_tailable(path),
-            InputKind::Stdin => self.resolve().map_or(false, |path| path_is_tailable(&path)),
+            InputKind::Stdin => self.resolve().is_some_and(|path| path_is_tailable(&path)),
         }
     }
 }
@@ -233,7 +233,7 @@ impl PathExtTail for Path {
 }
 
 pub fn path_is_tailable(path: &Path) -> bool {
-    path.is_file() || path.exists() && path.metadata().map_or(false, |meta| meta.is_tailable())
+    path.is_file() || path.exists() && path.metadata().is_ok_and(|meta| meta.is_tailable())
 }
 
 #[inline]

src/uu/uniq/src/uniq.rs

@@ -383,7 +383,7 @@ fn should_extract_obs_skip_chars(
         && posix_version().is_some_and(|v| v <= OBSOLETE)
         && !preceding_long_opt_req_value
         && !preceding_short_opt_req_value
-        && slice.chars().nth(1).map_or(false, |c| c.is_ascii_digit())
+        && slice.chars().nth(1).is_some_and(|c| c.is_ascii_digit())
 }
 
 /// Helper function to [`filter_args`]

src/uucore/src/lib/features/fs.rs

@@ -710,7 +710,7 @@ pub fn path_ends_with_terminator(path: &Path) -> bool {
     path.as_os_str()
         .as_bytes()
         .last()
-        .map_or(false, |&byte| byte == b'/' || byte == b'\\')
+        .is_some_and(|&byte| byte == b'/' || byte == b'\\')
 }
 
 #[cfg(windows)]

src/uuhelp_parser/src/lib.rs

@@ -73,7 +73,7 @@ pub fn parse_usage(content: &str) -> String {
 pub fn parse_section(section: &str, content: &str) -> Option<String> {
     fn is_section_header(line: &str, section: &str) -> bool {
         line.strip_prefix("##")
-            .map_or(false, |l| l.trim().to_lowercase() == section)
+            .is_some_and(|l| l.trim().to_lowercase() == section)
     }
 
     let section = &section.to_lowercase();