chore: simplify return in multi-branch

It is usually easier to reason about the code if the return is used in one place rather than in every branch of the match or if statements.

src/uu/chmod/src/chmod.rs

@@ -357,24 +357,24 @@ impl Chmoder {
             Ok(meta) => meta.mode() & 0o7777,
             Err(err) => {
                 // Handle dangling symlinks or other errors
-                if file.is_symlink() && !self.dereference {
+                return if file.is_symlink() && !self.dereference {
                     if self.verbose {
                         println!(
                             "neither symbolic link {} nor referent has been changed",
                             file.quote()
                         );
                     }
-                    return Ok(()); // Skip dangling symlinks
+                    Ok(()) // Skip dangling symlinks
                 } else if err.kind() == std::io::ErrorKind::PermissionDenied {
                     // These two filenames would normally be conditionally
                     // quoted, but GNU's tests expect them to always be quoted
-                    return Err(USimpleError::new(
+                    Err(USimpleError::new(
                         1,
                         format!("{}: Permission denied", file.quote()),
-                    ));
+                    ))
                 } else {
-                    return Err(USimpleError::new(1, format!("{}: {err}", file.quote())));
-                }
+                    Err(USimpleError::new(1, format!("{}: {err}", file.quote())))
+                };
             }
         };
 

src/uu/cp/src/copydir.rs

@@ -251,15 +251,15 @@ fn copy_direntry(
         && !ends_with_slash_dot(&source_absolute)
         && !local_to_target.exists()
     {
-        if target_is_file {
-            return Err("cannot overwrite non-directory with directory".into());
+        return if target_is_file {
+            Err("cannot overwrite non-directory with directory".into())
         } else {
             build_dir(&local_to_target, false, options, Some(&source_absolute))?;
             if options.verbose {
                 println!("{}", context_for(&source_relative, &local_to_target));
             }
-            return Ok(());
-        }
+            Ok(())
+        };
     }
 
     // If the source is not a directory, then we need to copy the file.

src/uu/cp/src/cp.rs

@@ -2451,10 +2451,10 @@ fn handle_no_preserve_mode(options: &Options, org_mode: u32) -> u32 {
         {
             const MODE_RW_UGO: u32 = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
             const S_IRWXUGO: u32 = S_IRWXU | S_IRWXG | S_IRWXO;
-            if is_explicit_no_preserve_mode {
-                return MODE_RW_UGO;
+            return if is_explicit_no_preserve_mode {
+                MODE_RW_UGO
             } else {
-                return org_mode & S_IRWXUGO;
+                org_mode & S_IRWXUGO
             };
         }
 

src/uu/df/src/blocks.rs

@@ -184,11 +184,7 @@ pub(crate) fn read_block_size(matches: &ArgMatches) -> Result<BlockSize, ParseSi
 fn block_size_from_env() -> Option<u64> {
     for env_var in ["DF_BLOCK_SIZE", "BLOCK_SIZE", "BLOCKSIZE"] {
         if let Ok(env_size) = env::var(env_var) {
-            if let Ok(size) = parse_size_u64(&env_size) {
-                return Some(size);
-            } else {
-                return None;
-            }
+            return parse_size_u64(&env_size).ok();
         }
     }
 

src/uu/env/src/env.rs

@@ -581,19 +581,21 @@ impl EnvAppData {
                 }
                 return Err(exit.code().unwrap().into());
             }
-            Err(ref err) => match err.kind() {
-                io::ErrorKind::NotFound | io::ErrorKind::InvalidInput => {
-                    return Err(self.make_error_no_such_file_or_dir(prog.deref()));
-                }
-                io::ErrorKind::PermissionDenied => {
-                    uucore::show_error!("{}: Permission denied", prog.quote());
-                    return Err(126.into());
-                }
-                _ => {
-                    uucore::show_error!("unknown error: {err:?}");
-                    return Err(126.into());
-                }
-            },
+            Err(ref err) => {
+                return match err.kind() {
+                    io::ErrorKind::NotFound | io::ErrorKind::InvalidInput => {
+                        Err(self.make_error_no_such_file_or_dir(prog.deref()))
+                    }
+                    io::ErrorKind::PermissionDenied => {
+                        uucore::show_error!("{}: Permission denied", prog.quote());
+                        Err(126.into())
+                    }
+                    _ => {
+                        uucore::show_error!("unknown error: {err:?}");
+                        Err(126.into())
+                    }
+                };
+            }
             Ok(_) => (),
         }
         Ok(())

src/uu/expand/src/expand.rs

@@ -145,14 +145,14 @@ fn tabstops_parse(s: &str) -> Result<(RemainingMode, Vec<usize>), ParseError> {
                             }
 
                             let s = s.trim_start_matches(char::is_numeric);
-                            if s.starts_with('/') || s.starts_with('+') {
-                                return Err(ParseError::SpecifierNotAtStartOfNumber(
+                            return if s.starts_with('/') || s.starts_with('+') {
+                                Err(ParseError::SpecifierNotAtStartOfNumber(
                                     s[0..1].to_string(),
                                     s.to_string(),
-                                ));
+                                ))
                             } else {
-                                return Err(ParseError::InvalidCharacter(s.to_string()));
-                            }
+                                Err(ParseError::InvalidCharacter(s.to_string()))
+                            };
                         }
                     }
                 }

src/uu/fmt/src/fmt.rs

@@ -270,14 +270,14 @@ fn extract_files(matches: &ArgMatches) -> UResult<Vec<String>> {
 fn extract_width(matches: &ArgMatches) -> UResult<Option<usize>> {
     let width_opt = matches.get_one::<String>(options::WIDTH);
     if let Some(width_str) = width_opt {
-        if let Ok(width) = width_str.parse::<usize>() {
-            return Ok(Some(width));
+        return if let Ok(width) = width_str.parse::<usize>() {
+            Ok(Some(width))
         } else {
-            return Err(USimpleError::new(
+            Err(USimpleError::new(
                 1,
                 format!("invalid width: {}", width_str.quote()),
-            ));
-        }
+            ))
+        };
     }
 
     if let Some(1) = matches.index_of(options::FILES_OR_WIDTH) {

src/uu/id/src/id.rs

@@ -176,7 +176,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let line_ending = LineEnding::from_zero_flag(state.zflag);
 
     if state.cflag {
-        if state.selinux_supported {
+        return if state.selinux_supported {
             // print SElinux context and exit
             #[cfg(all(any(target_os = "linux", target_os = "android"), feature = "selinux"))]
             if let Ok(context) = selinux::SecurityContext::current(false) {
@@ -186,13 +186,13 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                 // print error because `cflag` was explicitly requested
                 return Err(USimpleError::new(1, "can't get process context"));
             }
-            return Ok(());
+            Ok(())
         } else {
-            return Err(USimpleError::new(
+            Err(USimpleError::new(
                 1,
                 "--context (-Z) works only on an SELinux-enabled kernel",
-            ));
-        }
+            ))
+        };
     }
 
     for i in 0..=users.len() {

src/uu/readlink/src/readlink.rs

@@ -84,15 +84,15 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                 show(&path, line_ending).map_err_context(String::new)?;
             }
             Err(err) => {
-                if verbose {
-                    return Err(USimpleError::new(
+                return if verbose {
+                    Err(USimpleError::new(
                         1,
                         err.map_err_context(move || f.maybe_quote().to_string())
                             .to_string(),
-                    ));
+                    ))
                 } else {
-                    return Err(1.into());
-                }
+                    Err(1.into())
+                };
             }
         }
     }

src/uu/tail/src/follow/files.rs

@@ -162,12 +162,13 @@ impl FileHandling {
     pub fn needs_header(&self, path: &Path, verbose: bool) -> bool {
         if verbose {
             if let Some(ref last) = self.last {
-                return !last.eq(&path);
+                !last.eq(&path)
             } else {
-                return true;
+                true
             }
+        } else {
+            false
         }
-        false
     }
 }
 

src/uu/unexpand/src/unexpand.rs

@@ -44,14 +44,14 @@ fn tabstops_parse(s: &str) -> Result<Vec<usize>, ParseError> {
     for word in words {
         match word.parse::<usize>() {
             Ok(num) => nums.push(num),
-            Err(e) => match e.kind() {
-                IntErrorKind::PosOverflow => return Err(ParseError::TabSizeTooLarge),
-                _ => {
-                    return Err(ParseError::InvalidCharacter(
+            Err(e) => {
+                return match e.kind() {
+                    IntErrorKind::PosOverflow => Err(ParseError::TabSizeTooLarge),
+                    _ => Err(ParseError::InvalidCharacter(
                         word.trim_start_matches(char::is_numeric).to_string(),
-                    ));
-                }
-            },
+                    )),
+                };
+            }
         }
     }
 

src/uucore/src/lib/features/signals.rs

@@ -350,11 +350,7 @@ pub static ALL_SIGNALS: [&str; 37] = [
 pub fn signal_by_name_or_value(signal_name_or_value: &str) -> Option<usize> {
     let signal_name_upcase = signal_name_or_value.to_uppercase();
     if let Ok(value) = signal_name_upcase.parse() {
-        if is_signal(value) {
-            return Some(value);
-        } else {
-            return None;
-        }
+        return if is_signal(value) { Some(value) } else { None };
     }
     let signal_name = signal_name_upcase.trim_start_matches("SIG");