chore: use inline formatting

Minor cleanup using clippy autofix.  This makes the code a bit more readable, and helps spot a few inefficiencies and possible bugs.

```
cargo clippy --fix --workspace -- -A clippy::all -W clippy::uninlined_format_args && cargo fmt
```

src/uu/base32/src/base_common.rs

@@ -839,8 +839,7 @@ mod tests {
             assert_eq!(
                 has_padding(&mut cursor).unwrap(),
                 expected,
-                "Failed for input: '{}'",
-                input
+                "Failed for input: '{input}'"
             );
         }
     }

src/uu/chgrp/src/chgrp.rs

@@ -24,7 +24,7 @@ fn parse_gid_from_str(group: &str) -> Result<u32, String> {
         // Handle :gid format
         gid_str
             .parse::<u32>()
-            .map_err(|_| format!("invalid group id: '{}'", gid_str))
+            .map_err(|_| format!("invalid group id: '{gid_str}'"))
     } else {
         // Try as group name first
         match entries::grp2gid(group) {
@@ -32,7 +32,7 @@ fn parse_gid_from_str(group: &str) -> Result<u32, String> {
             // If group name lookup fails, try parsing as raw number
             Err(_) => group
                 .parse::<u32>()
-                .map_err(|_| format!("invalid group: '{}'", group)),
+                .map_err(|_| format!("invalid group: '{group}'")),
         }
     }
 }
@@ -75,7 +75,7 @@ fn parse_gid_and_uid(matches: &ArgMatches) -> UResult<GidUidOwnerFilter> {
             Err(_) => {
                 return Err(USimpleError::new(
                     1,
-                    format!("invalid user: '{}'", from_group),
+                    format!("invalid user: '{from_group}'"),
                 ));
             }
         }

src/uu/env/src/env.rs

@@ -317,19 +317,19 @@ pub fn parse_args_from_str(text: &NativeIntStr) -> UResult<Vec<NativeIntString>>
         }
         EnvError::EnvMissingClosingQuote(_, _) => USimpleError::new(125, e.to_string()),
         EnvError::EnvParsingOfVariableMissingClosingBrace(pos) => {
-            USimpleError::new(125, format!("variable name issue (at {pos}): {}", e))
+            USimpleError::new(125, format!("variable name issue (at {pos}): {e}"))
         }
         EnvError::EnvParsingOfMissingVariable(pos) => {
-            USimpleError::new(125, format!("variable name issue (at {pos}): {}", e))
+            USimpleError::new(125, format!("variable name issue (at {pos}): {e}"))
         }
         EnvError::EnvParsingOfVariableMissingClosingBraceAfterValue(pos) => {
-            USimpleError::new(125, format!("variable name issue (at {pos}): {}", e))
+            USimpleError::new(125, format!("variable name issue (at {pos}): {e}"))
         }
         EnvError::EnvParsingOfVariableUnexpectedNumber(pos, _) => {
-            USimpleError::new(125, format!("variable name issue (at {pos}): {}", e))
+            USimpleError::new(125, format!("variable name issue (at {pos}): {e}"))
         }
         EnvError::EnvParsingOfVariableExceptedBraceOrColon(pos, _) => {
-            USimpleError::new(125, format!("variable name issue (at {pos}): {}", e))
+            USimpleError::new(125, format!("variable name issue (at {pos}): {e}"))
         }
         _ => USimpleError::new(125, format!("Error: {e:?}")),
     })

src/uu/head/src/head.rs

@@ -247,7 +247,7 @@ impl HeadOptions {
 fn wrap_in_stdout_error(err: io::Error) -> io::Error {
     io::Error::new(
         err.kind(),
-        format!("error writing 'standard output': {}", err),
+        format!("error writing 'standard output': {err}"),
     )
 }
 

src/uu/join/src/join.rs

@@ -734,10 +734,7 @@ fn parse_separator(value_os: &OsString) -> UResult<SepSetting> {
     match chars.next() {
         None => Ok(SepSetting::Char(value.into())),
         Some('0') if c == '\\' => Ok(SepSetting::Byte(0)),
-        _ => Err(USimpleError::new(
-            1,
-            format!("multi-character tab {}", value),
-        )),
+        _ => Err(USimpleError::new(1, format!("multi-character tab {value}"))),
     }
 }
 

src/uu/ln/src/ln.rs

@@ -60,7 +60,7 @@ enum LnError {
     MissingDestination(PathBuf),
 
     #[error("extra operand {}\nTry '{} --help' for more information.", 
-    format!("{:?}", _0).trim_matches('"'), _1)]
+    format!("{_0:?}").trim_matches('"'), _1)]
     ExtraOperand(OsString, String),
 }
 

src/uu/stat/src/stat.rs

@@ -116,7 +116,7 @@ impl std::str::FromStr for QuotingStyle {
             "shell" => Ok(QuotingStyle::Shell),
             "shell-escape-always" => Ok(QuotingStyle::ShellEscapeAlways),
             // The others aren't exposed to the user
-            _ => Err(format!("Invalid quoting style: {}", s)),
+            _ => Err(format!("Invalid quoting style: {s}")),
         }
     }
 }
@@ -335,9 +335,9 @@ fn quote_file_name(file_name: &str, quoting_style: &QuotingStyle) -> String {
     match quoting_style {
         QuotingStyle::Locale | QuotingStyle::Shell => {
             let escaped = file_name.replace('\'', r"\'");
-            format!("'{}'", escaped)
+            format!("'{escaped}'")
         }
-        QuotingStyle::ShellEscapeAlways => format!("\"{}\"", file_name),
+        QuotingStyle::ShellEscapeAlways => format!("\"{file_name}\""),
         QuotingStyle::Quote => file_name.to_string(),
     }
 }
@@ -450,7 +450,7 @@ fn print_integer(
     let extended = match precision {
         Precision::NotSpecified => format!("{prefix}{arg}"),
         Precision::NoNumber => format!("{prefix}{arg}"),
-        Precision::Number(p) => format!("{prefix}{arg:0>precision$}", precision = p),
+        Precision::Number(p) => format!("{prefix}{arg:0>p$}"),
     };
     pad_and_print(&extended, flags.left, width, padding_char);
 }
@@ -532,7 +532,7 @@ fn print_unsigned(
     let s = match precision {
         Precision::NotSpecified => s,
         Precision::NoNumber => s,
-        Precision::Number(p) => format!("{s:0>precision$}", precision = p).into(),
+        Precision::Number(p) => format!("{s:0>p$}").into(),
     };
     pad_and_print(&s, flags.left, width, padding_char);
 }
@@ -557,7 +557,7 @@ fn print_unsigned_oct(
     let s = match precision {
         Precision::NotSpecified => format!("{prefix}{num:o}"),
         Precision::NoNumber => format!("{prefix}{num:o}"),
-        Precision::Number(p) => format!("{prefix}{num:0>precision$o}", precision = p),
+        Precision::Number(p) => format!("{prefix}{num:0>p$o}"),
     };
     pad_and_print(&s, flags.left, width, padding_char);
 }
@@ -582,7 +582,7 @@ fn print_unsigned_hex(
     let s = match precision {
         Precision::NotSpecified => format!("{prefix}{num:x}"),
         Precision::NoNumber => format!("{prefix}{num:x}"),
-        Precision::Number(p) => format!("{prefix}{num:0>precision$x}", precision = p),
+        Precision::Number(p) => format!("{prefix}{num:0>p$x}"),
     };
     pad_and_print(&s, flags.left, width, padding_char);
 }
@@ -994,7 +994,7 @@ impl Stater {
                     'R' => {
                         let major = meta.rdev() >> 8;
                         let minor = meta.rdev() & 0xff;
-                        OutputType::Str(format!("{},{}", major, minor))
+                        OutputType::Str(format!("{major},{minor}"))
                     }
                     'r' => OutputType::Unsigned(meta.rdev()),
                     'H' => OutputType::Unsigned(meta.rdev() >> 8), // Major in decimal

src/uu/stdbuf/src/stdbuf.rs

@@ -170,7 +170,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
                     127,
                     format!("{EXEC_ERROR} No such file or directory"),
                 )),
-                _ => Err(USimpleError::new(1, format!("{EXEC_ERROR} {}", e))),
+                _ => Err(USimpleError::new(1, format!("{EXEC_ERROR} {e}"))),
             };
         }
     };

src/uu/uptime/src/uptime.rs

@@ -236,7 +236,7 @@ fn default_uptime(matches: &ArgMatches) -> UResult<()> {
 fn print_loadavg() {
     match get_formatted_loadavg() {
         Err(_) => {}
-        Ok(s) => println!("{}", s),
+        Ok(s) => println!("{s}"),
     }
 }
 

src/uucore/src/lib/features/backup_control.rs

@@ -433,7 +433,7 @@ fn numbered_backup_path(path: &Path) -> PathBuf {
     let file_name = path.file_name().unwrap_or_default();
     for i in 1_u64.. {
         let mut numbered_file_name = file_name.to_os_string();
-        numbered_file_name.push(format!(".~{}~", i));
+        numbered_file_name.push(format!(".~{i}~"));
         let path = path.with_file_name(numbered_file_name);
         if !path.exists() {
             return path;

src/uucore/src/lib/features/buf_copy/common.rs

@@ -15,8 +15,8 @@ pub enum Error {
 impl std::fmt::Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Error::WriteError(msg) => write!(f, "splice() write error: {}", msg),
-            Error::Io(err) => write!(f, "I/O error: {}", err),
+            Error::WriteError(msg) => write!(f, "splice() write error: {msg}"),
+            Error::Io(err) => write!(f, "I/O error: {err}"),
         }
     }
 }

src/uucore/src/lib/features/quoting_style.rs

@@ -863,7 +863,7 @@ mod tests {
                 ("????????????????", "shell"),
                 (test_str, "shell-show"),
                 ("'????????????????'", "shell-always"),
-                (&format!("'{}'", test_str), "shell-always-show"),
+                (&format!("'{test_str}'"), "shell-always-show"),
                 (
                     "''$'\\302\\200\\302\\201\\302\\202\\302\\203\\302\\204\\302\\205\\302\\206\\302\\207\\302\\210\\302\\211\\302\\212\\302\\213\\302\\214\\302\\215\\302\\216\\302\\217'",
                     "shell-escape",
@@ -893,7 +893,7 @@ mod tests {
                 ("????????????????", "shell"),
                 (test_str, "shell-show"),
                 ("'????????????????'", "shell-always"),
-                (&format!("'{}'", test_str), "shell-always-show"),
+                (&format!("'{test_str}'"), "shell-always-show"),
                 (
                     "''$'\\302\\220\\302\\221\\302\\222\\302\\223\\302\\224\\302\\225\\302\\226\\302\\227\\302\\230\\302\\231\\302\\232\\302\\233\\302\\234\\302\\235\\302\\236\\302\\237'",
                     "shell-escape",

src/uucore/src/lib/features/uptime.rs

@@ -308,7 +308,7 @@ pub fn format_nusers(nusers: usize) -> String {
     match nusers {
         0 => "0 user".to_string(),
         1 => "1 user".to_string(),
-        _ => format!("{} users", nusers),
+        _ => format!("{nusers} users"),
     }
 }
 

tests/by-util/test_cp.rs

@@ -6093,9 +6093,7 @@ fn test_cp_preserve_xattr_readonly_source() {
     let stdout = String::from_utf8_lossy(&getfattr_output.stdout);
     assert!(
         stdout.contains(xattr_key),
-        "Expected '{}' not found in getfattr output:\n{}",
-        xattr_key,
-        stdout
+        "Expected '{xattr_key}' not found in getfattr output:\n{stdout}"
     );
 
     at.set_readonly(source_file);

tests/by-util/test_csplit.rs

@@ -1457,7 +1457,7 @@ fn create_named_pipe_with_writer(path: &str, data: &str) -> std::process::Child
     nix::unistd::mkfifo(path, nix::sys::stat::Mode::S_IRWXU).unwrap();
     std::process::Command::new("sh")
         .arg("-c")
-        .arg(format!("printf '{}' > {path}", data))
+        .arg(format!("printf '{data}' > {path}"))
         .spawn()
         .unwrap()
 }

tests/by-util/test_head.rs

@@ -435,7 +435,7 @@ fn test_all_but_last_bytes_large_file_piped() {
         .len();
     scene
         .ucmd()
-        .args(&["-c", &format!("-{}", seq_19001_20000_file_length)])
+        .args(&["-c", &format!("-{seq_19001_20000_file_length}")])
         .pipe_in_fixture(seq_20000_file_name)
         .succeeds()
         .stdout_only_fixture(seq_19000_file_name);
@@ -695,7 +695,7 @@ fn test_validate_stdin_offset_bytes() {
         .len();
     scene
         .ucmd()
-        .args(&["-c", &format!("-{}", seq_19001_20000_file_length)])
+        .args(&["-c", &format!("-{seq_19001_20000_file_length}")])
         .set_stdin(file)
         .succeeds()
         .stdout_only_fixture(seq_19000_file_name);

tests/test_util_name.rs

@@ -20,7 +20,7 @@ fn init() {
         std::env::set_var("UUTESTS_BINARY_PATH", TESTS_BINARY);
     }
     // Print for debugging
-    eprintln!("Setting UUTESTS_BINARY_PATH={}", TESTS_BINARY);
+    eprintln!("Setting UUTESTS_BINARY_PATH={TESTS_BINARY}");
 }
 
 #[test]