fix clippy warning

src/uu/basename/src/basename.rs

@@ -136,7 +136,7 @@ fn basename(fullname: &str, suffix: &str) -> String {
     }
 }
 
-#[allow(clippy::manual_strip)] // can be replaced with strip_suffix once the minimum rust version is 1.45
+// can be replaced with strip_suffix once the minimum rust version is 1.45
 fn strip_suffix(name: &str, suffix: &str) -> String {
     if name == suffix {
         return name.to_owned();

src/uu/cp/src/cp.rs

@@ -669,8 +669,8 @@ impl Options {
                 }
             },
             backup: backup_mode,
-            backup_suffix: backup_suffix,
-            overwrite: overwrite,
+            backup_suffix,
+            overwrite,
             no_target_dir,
             preserve_attributes,
             recursive,
@@ -1089,7 +1089,7 @@ fn copy_attribute(source: &Path, dest: &Path, attribute: &Attribute) -> CopyResu
 }
 
 #[cfg(not(windows))]
-#[allow(clippy::unnecessary_wraps)] // needed for windows version
+#[allow(clippy::unnecessary_unwrap)] // needed for windows version
 fn symlink_file(source: &Path, dest: &Path, context: &str) -> CopyResult<()> {
     match std::os::unix::fs::symlink(source, dest).context(context) {
         Ok(_) => Ok(()),

src/uu/csplit/src/csplit.rs

@@ -483,10 +483,11 @@ where
     /// Shrink the buffer so that its length is equal to the set size, returning an iterator for
     /// the elements that were too much.
     fn shrink_buffer_to_size(&mut self) -> impl Iterator<Item = String> + '_ {
-        let mut shrink_offset = 0;
-        if self.buffer.len() > self.size {
-            shrink_offset = self.buffer.len() - self.size;
-        }
+        let shrink_offset = if self.buffer.len() > self.size {
+            self.buffer.len() - self.size
+        } else {
+            0
+        };
         self.buffer
             .drain(..shrink_offset)
             .map(|(_, line)| line.unwrap())

src/uu/ls/src/ls.rs

@@ -1614,7 +1614,7 @@ fn display_date(metadata: &Metadata, config: &Config) -> String {
         Some(time) => {
             //Date is recent if from past 6 months
             //According to GNU a Gregorian year has 365.2425 * 24 * 60 * 60 == 31556952 seconds on the average.
-            let recent = time + chrono::Duration::seconds(31556952 / 2) > chrono::Local::now();
+            let recent = time + chrono::Duration::seconds(31_556_952 / 2) > chrono::Local::now();
 
             match config.time_style {
                 TimeStyle::FullIso => time.format("%Y-%m-%d %H:%M:%S.%f %z"),
@@ -1696,7 +1696,6 @@ fn file_is_executable(md: &Metadata) -> bool {
     md.mode() & ((S_IXUSR | S_IXGRP | S_IXOTH) as u32) != 0
 }
 
-#[allow(clippy::clippy::collapsible_else_if)]
 fn classify_file(path: &PathData) -> Option<char> {
     let file_type = path.file_type()?;
 

src/uu/od/src/parse_inputs.rs

@@ -76,7 +76,7 @@ pub fn parse_inputs(matches: &dyn CommandLineOpts) -> Result<CommandLineInputs,
         input_strings.push("-");
     }
     Ok(CommandLineInputs::FileNames(
-        input_strings.iter().map(|s| s.to_string()).collect(),
+        input_strings.iter().map(|&s| s.to_string()).collect(),
     ))
 }
 
@@ -92,7 +92,7 @@ pub fn parse_inputs_traditional(input_strings: Vec<&str>) -> Result<CommandLineI
             Ok(match offset0 {
                 Ok(n) => CommandLineInputs::FileAndOffset(("-".to_string(), n, None)),
                 _ => CommandLineInputs::FileNames(
-                    input_strings.iter().map(|s| s.to_string()).collect(),
+                    input_strings.iter().map(|&s| s.to_string()).collect(),
                 ),
             })
         }
@@ -179,7 +179,7 @@ mod tests {
     impl<'a> MockOptions<'a> {
         fn new(inputs: Vec<&'a str>, option_names: Vec<&'a str>) -> MockOptions<'a> {
             MockOptions {
-                inputs: inputs.iter().map(|s| s.to_string()).collect::<Vec<_>>(),
+                inputs: inputs.iter().map(|&s| s.to_string()).collect::<Vec<_>>(),
                 option_names,
             }
         }

src/uu/printenv/src/printenv.rs

@@ -50,10 +50,11 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .map(|v| v.map(ToString::to_string).collect())
         .unwrap_or_default();
 
-    let mut separator = "\n";
-    if matches.is_present(OPT_NULL) {
-        separator = "\x00";
-    }
+    let separator = if matches.is_present(OPT_NULL) {
+        "\x00"
+    } else {
+        "\n"
+    };
 
     if variables.is_empty() {
         for (env_var, value) in env::vars() {

src/uu/ptx/src/ptx.rs

@@ -108,10 +108,13 @@ impl WordFilter {
         // Ignore empty string regex from cmd-line-args
         let arg_reg: Option<String> = if matches.is_present(options::WORD_REGEXP) {
             match matches.value_of(options::WORD_REGEXP) {
-                Some(v) => match v.is_empty() {
-                    true => None,
-                    false => Some(v.to_string()),
-                },
+                Some(v) => {
+                    if v.is_empty() {
+                        None
+                    } else {
+                        Some(v.to_string())
+                    }
+                }
                 None => None,
             }
         } else {

src/uu/sort/src/sort.rs

@@ -296,10 +296,10 @@ impl<'a> Line<'a> {
     fn print(&self, writer: &mut impl Write, settings: &GlobalSettings) {
         if settings.zero_terminated && !settings.debug {
             crash_if_err!(1, writer.write_all(self.line.as_bytes()));
-            crash_if_err!(1, writer.write_all("\0".as_bytes()));
+            crash_if_err!(1, writer.write_all(b"\0"));
         } else if !settings.debug {
             crash_if_err!(1, writer.write_all(self.line.as_bytes()));
-            crash_if_err!(1, writer.write_all("\n".as_bytes()));
+            crash_if_err!(1, writer.write_all(b"\n"));
         } else {
             crash_if_err!(1, self.print_debug(settings, writer));
         }
@@ -1437,7 +1437,7 @@ mod tests {
     fn test_get_hash() {
         let a = "Ted".to_string();
 
-        assert_eq!(2646829031758483623, get_hash(&a));
+        assert_eq!(2_646_829_031_758_483_623, get_hash(&a));
     }
 
     #[test]

src/uucore/src/lib/lib.rs

@@ -146,15 +146,16 @@ pub trait Args: Iterator<Item = OsString> + Sized {
                 InvalidEncodingHandling::Ignore => s.is_ok(),
                 _ => true,
             })
-            .map(|s| match s.is_ok() {
-                true => s.unwrap(),
-                false => s.unwrap_err(),
+            .map(|s| match s {
+                Ok(v) => v,
+                Err(e) => e,
             })
             .collect();
 
-        match full_conversion {
-            true => ConversionResult::Complete(result_vector),
-            false => ConversionResult::Lossy(result_vector),
+        if full_conversion {
+            ConversionResult::Complete(result_vector)
+        } else {
+            ConversionResult::Lossy(result_vector)
         }
     }
 

src/uucore/src/lib/mods/backup_control.rs

@@ -33,7 +33,7 @@ pub fn determine_backup_suffix(supplied_suffix: Option<&str>) -> String {
     if let Some(suffix) = supplied_suffix {
         String::from(suffix)
     } else {
-        env::var("SIMPLE_BACKUP_SUFFIX").unwrap_or("~".to_owned())
+        env::var("SIMPLE_BACKUP_SUFFIX").unwrap_or_else(|_| "~".to_owned())
     }
 }