add additional lints

Author: danieleades

.cargo/config

@@ -1,2 +1,11 @@
 [target.x86_64-unknown-redox]
 linker = "x86_64-unknown-redox-gcc"
+
+[target.'cfg(feature = "cargo-clippy")']
+rustflags = [
+  "-Wclippy::use_self",
+  "-Wclippy::needless_pass_by_value",
+  "-Wclippy::semicolon_if_nothing_returned",
+  "-Wclippy::single_char_pattern",
+  "-Wclippy::explicit_iter_loop",
+]

src/bin/coreutils.rs

@@ -87,7 +87,7 @@ fn main() {
         };
 
         if util == "completion" {
-            gen_completions(args, utils);
+            gen_completions(args, &utils);
         }
 
         match utils.get(util) {
@@ -132,7 +132,7 @@ fn main() {
 /// Prints completions for the utility in the first parameter for the shell in the second parameter to stdout
 fn gen_completions<T: uucore::Args>(
     args: impl Iterator<Item = OsString>,
-    util_map: UtilityMap<T>,
+    util_map: &UtilityMap<T>,
 ) -> ! {
     let all_utilities: Vec<_> = std::iter::once("coreutils")
         .chain(util_map.keys().copied())
@@ -168,9 +168,9 @@ fn gen_completions<T: uucore::Args>(
     process::exit(0);
 }
 
-fn gen_coreutils_app<T: uucore::Args>(util_map: UtilityMap<T>) -> App<'static> {
+fn gen_coreutils_app<T: uucore::Args>(util_map: &UtilityMap<T>) -> App<'static> {
     let mut app = App::new("coreutils");
-    for (_, (_, sub_app)) in &util_map {
+    for (_, (_, sub_app)) in util_map {
         app = app.subcommand(sub_app());
     }
     app

src/uu/chroot/src/chroot.rs

@@ -201,12 +201,12 @@ fn set_main_group(group: &str) -> UResult<()> {
 }
 
 #[cfg(any(target_vendor = "apple", target_os = "freebsd"))]
-fn set_groups(groups: Vec<libc::gid_t>) -> libc::c_int {
+fn set_groups(groups: &[libc::gid_t]) -> libc::c_int {
     unsafe { setgroups(groups.len() as libc::c_int, groups.as_ptr()) }
 }
 
 #[cfg(target_os = "linux")]
-fn set_groups(groups: Vec<libc::gid_t>) -> libc::c_int {
+fn set_groups(groups: &[libc::gid_t]) -> libc::c_int {
     unsafe { setgroups(groups.len() as libc::size_t, groups.as_ptr()) }
 }
 
@@ -220,7 +220,7 @@ fn set_groups_from_str(groups: &str) -> UResult<()> {
             };
             groups_vec.push(gid);
         }
-        let err = set_groups(groups_vec);
+        let err = set_groups(&groups_vec);
         if err != 0 {
             return Err(ChrootError::SetGroupsFailed(Error::last_os_error()).into());
         }

src/uu/du/src/du.rs

@@ -144,7 +144,7 @@ impl Stat {
         #[cfg(windows)]
         let file_info = get_file_info(&path);
         #[cfg(windows)]
-        Ok(Stat {
+        Ok(Self {
             path,
             is_dir: metadata.is_dir(),
             size: metadata.len(),

src/uu/env/src/env.rs

@@ -104,6 +104,7 @@ fn load_config_file(opts: &mut Options) -> UResult<()> {
 }
 
 #[cfg(not(windows))]
+#[allow(clippy::ptr_arg)]
 fn build_command<'a, 'b>(args: &'a mut Vec<&'b str>) -> (Cow<'b, str>, &'a [&'b str]) {
     let progname = Cow::from(args[0]);
     (progname, &args[1..])

src/uu/kill/src/kill.rs

@@ -74,7 +74,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             table();
             Ok(())
         }
-        Mode::List => list(pids_or_signals.get(0).cloned()),
+        Mode::List => list(pids_or_signals.get(0)),
     }
 }
 
@@ -168,9 +168,9 @@ fn print_signals() {
     println!();
 }
 
-fn list(arg: Option<String>) -> UResult<()> {
+fn list(arg: Option<&String>) -> UResult<()> {
     match arg {
-        Some(ref x) => print_signal(x),
+        Some(x) => print_signal(x),
         None => {
             print_signals();
             Ok(())

src/uu/split/src/number.rs

@@ -96,8 +96,8 @@ impl Number {
     #[allow(dead_code)]
     fn digits(&self) -> &Vec<u8> {
         match self {
-            Number::FixedWidth(number) => &number.digits,
-            Number::DynamicWidth(number) => &number.digits,
+            Self::FixedWidth(number) => &number.digits,
+            Self::DynamicWidth(number) => &number.digits,
         }
     }
 
@@ -136,17 +136,17 @@ impl Number {
     /// ```
     pub fn increment(&mut self) -> Result<(), Overflow> {
         match self {
-            Number::FixedWidth(number) => number.increment(),
-            Number::DynamicWidth(number) => number.increment(),
+            Self::FixedWidth(number) => number.increment(),
+            Self::DynamicWidth(number) => number.increment(),
         }
     }
 }
 
 impl Display for Number {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
-            Number::FixedWidth(number) => number.fmt(f),
-            Number::DynamicWidth(number) => number.fmt(f),
+            Self::FixedWidth(number) => number.fmt(f),
+            Self::DynamicWidth(number) => number.fmt(f),
         }
     }
 }
@@ -183,8 +183,8 @@ pub struct FixedWidthNumber {
 
 impl FixedWidthNumber {
     /// Instantiate a number of the given radix and width.
-    pub fn new(radix: u8, width: usize) -> FixedWidthNumber {
-        FixedWidthNumber {
+    pub fn new(radix: u8, width: usize) -> Self {
+        Self {
             radix,
             digits: vec![0; width],
         }
@@ -286,8 +286,8 @@ impl DynamicWidthNumber {
     ///
     /// This associated function returns a new instance of the struct
     /// with the given radix and a width of two digits, both 0.
-    pub fn new(radix: u8) -> DynamicWidthNumber {
-        DynamicWidthNumber {
+    pub fn new(radix: u8) -> Self {
+        Self {
             radix,
             digits: vec![0, 0],
         }
@@ -404,7 +404,7 @@ mod tests {
         fn num(n: usize) -> Number {
             let mut number = Number::DynamicWidth(DynamicWidthNumber::new(26));
             for _ in 0..n {
-                number.increment().unwrap()
+                number.increment().unwrap();
             }
             number
         }
@@ -428,7 +428,7 @@ mod tests {
         fn num(n: usize) -> Number {
             let mut number = Number::DynamicWidth(DynamicWidthNumber::new(10));
             for _ in 0..n {
-                number.increment().unwrap()
+                number.increment().unwrap();
             }
             number
         }

src/uu/split/src/split.rs

@@ -62,7 +62,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         .override_usage(&usage[..])
         .after_help(&long_usage[..])
         .get_matches_from(args);
-    let settings = Settings::from(matches)?;
+    let settings = Settings::from(&matches)?;
     split(&settings)
 }
 
@@ -232,7 +232,7 @@ struct Settings {
 
 impl Settings {
     /// Parse a strategy from the command-line arguments.
-    fn from(matches: ArgMatches) -> UResult<Self> {
+    fn from(matches: &ArgMatches) -> UResult<Self> {
         let result = Self {
             suffix_length: matches
                 .value_of(OPT_SUFFIX_LENGTH)
@@ -242,7 +242,7 @@ impl Settings {
             numeric_suffix: matches.occurrences_of(OPT_NUMERIC_SUFFIXES) > 0,
             additional_suffix: matches.value_of(OPT_ADDITIONAL_SUFFIX).unwrap().to_owned(),
             verbose: matches.occurrences_of("verbose") > 0,
-            strategy: Strategy::from(&matches)?,
+            strategy: Strategy::from(matches)?,
             input: matches.value_of(ARG_INPUT).unwrap().to_owned(),
             prefix: matches.value_of(ARG_PREFIX).unwrap().to_owned(),
             filter: matches.value_of(OPT_FILTER).map(|s| s.to_owned()),

src/uu/tail/src/platform/unix.rs

@@ -30,6 +30,7 @@ impl ProcessChecker {
     }
 
     // Borrowing mutably to be aligned with Windows implementation
+    #[allow(clippy::wrong_self_convention)]
     pub fn is_dead(&mut self) -> bool {
         unsafe { libc::kill(self.pid, 0) != 0 && get_errno() != libc::EPERM }
     }

src/uu/tail/src/platform/windows.rs

@@ -24,11 +24,11 @@ pub struct ProcessChecker {
 }
 
 impl ProcessChecker {
-    pub fn new(process_id: self::Pid) -> ProcessChecker {
+    pub fn new(process_id: self::Pid) -> Self {
         #[allow(non_snake_case)]
         let FALSE = 0i32;
         let h = unsafe { OpenProcess(SYNCHRONIZE, FALSE, process_id as DWORD) };
-        ProcessChecker {
+        Self {
             dead: h.is_null(),
             handle: h,
         }