fix clippy for unix

src/uu/chgrp/src/chgrp.rs

@@ -286,7 +286,7 @@ impl Chgrper {
 
             ret = match wrap_chgrp(path, &meta, self.dest_gid, follow, self.verbosity.clone()) {
                 Ok(n) => {
-                    if n != "" {
+                    if !n.is_empty() {
                         show_info!("{}", n);
                     }
                     0

src/uu/chmod/src/chmod.rs

@@ -171,13 +171,13 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 // of a prefix '-' if it's associated with MODE
 // e.g. "chmod -v -xw -R FILE" -> "chmod -v xw -R FILE"
 pub fn strip_minus_from_mode(args: &mut Vec<String>) -> bool {
-    for i in 0..args.len() {
+    for arg in args {
-        if args[i].starts_with("-") {
+        if arg.starts_with('-') {
-            if let Some(second) = args[i].chars().nth(1) {
+            if let Some(second) = arg.chars().nth(1) {
                 match second {
                     'r' | 'w' | 'x' | 'X' | 's' | 't' | 'u' | 'g' | 'o' | '0'..='7' => {
                         // TODO: use strip_prefix() once minimum rust version reaches 1.45.0
-                        args[i] = args[i][1..args[i].len()].to_string();
+                        *arg = arg[1..arg.len()].to_string();
                         return true;
                     }
                     _ => {}

src/uu/chown/src/chown.rs

@@ -391,7 +391,7 @@ impl Chowner {
                 self.verbosity.clone(),
             ) {
                 Ok(n) => {
-                    if n != "" {
+                    if !n.is_empty() {
                         show_info!("{}", n);
                     }
                     0
@@ -446,7 +446,7 @@ impl Chowner {
                 self.verbosity.clone(),
             ) {
                 Ok(n) => {
-                    if n != "" {
+                    if !n.is_empty() {
                         show_info!("{}", n);
                     }
                     0

src/uu/chroot/src/chroot.rs

@@ -104,7 +104,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         _ => {
             let mut vector: Vec<&str> = Vec::new();
             for (&k, v) in matches.args.iter() {
-                vector.push(k.clone());
+                vector.push(k);
                 vector.push(&v.vals[0].to_str().unwrap());
             }
             vector
@@ -133,7 +133,7 @@ fn set_context(root: &Path, options: &clap::ArgMatches) {
     let userspec = match userspec_str {
         Some(ref u) => {
             let s: Vec<&str> = u.split(':').collect();
-            if s.len() != 2 || s.iter().any(|&spec| spec == "") {
+            if s.len() != 2 || s.iter().any(|&spec| spec.is_empty()) {
                 crash!(1, "invalid userspec: `{}`", u)
             };
             s
@@ -142,16 +142,16 @@ fn set_context(root: &Path, options: &clap::ArgMatches) {
     };
 
     let (user, group) = if userspec.is_empty() {
-        (&user_str[..], &group_str[..])
+        (user_str, group_str)
     } else {
-        (&userspec[0][..], &userspec[1][..])
+        (userspec[0], userspec[1])
     };
 
     enter_chroot(root);
 
-    set_groups_from_str(&groups_str[..]);
+    set_groups_from_str(groups_str);
-    set_main_group(&group[..]);
+    set_main_group(group);
-    set_user(&user[..]);
+    set_user(user);
 }
 
 fn enter_chroot(root: &Path) {

src/uu/install/src/install.rs

@@ -302,7 +302,7 @@ fn behavior(matches: &ArgMatches) -> Result<Behavior, i32> {
 
     let specified_mode: Option<u32> = if matches.is_present(OPT_MODE) {
         match matches.value_of(OPT_MODE) {
-            Some(x) => match mode::parse(&x[..], considering_dir) {
+            Some(x) => match mode::parse(x, considering_dir) {
                 Ok(y) => Some(y),
                 Err(err) => {
                     show_error!("Invalid mode string: {}", err);
@@ -429,7 +429,7 @@ fn standard(paths: Vec<String>, b: Behavior) -> i32 {
 /// _files_ must all exist as non-directories.
 /// _target_dir_ must be a directory.
 ///
-fn copy_files_into_dir(files: &[PathBuf], target_dir: &PathBuf, b: &Behavior) -> i32 {
+fn copy_files_into_dir(files: &[PathBuf], target_dir: &Path, b: &Behavior) -> i32 {
     if !target_dir.is_dir() {
         show_error!("target '{}' is not a directory", target_dir.display());
         return 1;
@@ -453,7 +453,7 @@ fn copy_files_into_dir(files: &[PathBuf], target_dir: &PathBuf, b: &Behavior) ->
             continue;
         }
 
-        let mut targetpath = target_dir.clone().to_path_buf();
+        let mut targetpath = target_dir.to_path_buf();
         let filename = sourcepath.components().last().unwrap();
         targetpath.push(filename);
 
@@ -478,7 +478,7 @@ fn copy_files_into_dir(files: &[PathBuf], target_dir: &PathBuf, b: &Behavior) ->
 /// _file_ must exist as a non-directory.
 /// _target_ must be a non-directory
 ///
-fn copy_file_to_file(file: &PathBuf, target: &PathBuf, b: &Behavior) -> i32 {
+fn copy_file_to_file(file: &Path, target: &Path, b: &Behavior) -> i32 {
     if copy(file, &target, b).is_err() {
         1
     } else {
@@ -497,7 +497,7 @@ fn copy_file_to_file(file: &PathBuf, target: &PathBuf, b: &Behavior) -> i32 {
 ///
 /// If the copy system call fails, we print a verbose error and return an empty error value.
 ///
-fn copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> Result<(), ()> {
+fn copy(from: &Path, to: &Path, b: &Behavior) -> Result<(), ()> {
     if b.compare && !need_copy(from, to, b) {
         return Ok(());
     }
@@ -556,7 +556,7 @@ fn copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> Result<(), ()> {
         };
         let gid = meta.gid();
         match wrap_chown(
-            to.as_path(),
+            to,
             &meta,
             Some(owner_id),
             Some(gid),
@@ -582,7 +582,7 @@ fn copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> Result<(), ()> {
             Ok(g) => g,
             _ => crash!(1, "no such group: {}", b.group),
         };
-        match wrap_chgrp(to.as_path(), &meta, group_id, false, Verbosity::Normal) {
+        match wrap_chgrp(to, &meta, group_id, false, Verbosity::Normal) {
             Ok(n) => {
                 if !n.is_empty() {
                     show_info!("{}", n);
@@ -601,7 +601,7 @@ fn copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> Result<(), ()> {
         let modified_time = FileTime::from_last_modification_time(&meta);
         let accessed_time = FileTime::from_last_access_time(&meta);
 
-        match set_file_times(to.as_path(), accessed_time, modified_time) {
+        match set_file_times(to, accessed_time, modified_time) {
             Ok(_) => {}
             Err(e) => show_info!("{}", e),
         }
@@ -630,7 +630,7 @@ fn copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> Result<(), ()> {
 ///
 /// Crashes the program if a nonexistent owner or group is specified in _b_.
 ///
-fn need_copy(from: &PathBuf, to: &PathBuf, b: &Behavior) -> bool {
+fn need_copy(from: &Path, to: &Path, b: &Behavior) -> bool {
     let from_meta = match fs::metadata(from) {
         Ok(meta) => meta,
         Err(_) => return true,

src/uu/ls/src/ls.rs

@@ -370,6 +370,7 @@ impl Config {
             })
             .or_else(|| termsize::get().map(|s| s.cols));
 
+        #[allow(clippy::needless_bool)]
         let show_control = if options.is_present(options::HIDE_CONTROL_CHARS) {
             false
         } else if options.is_present(options::SHOW_CONTROL_CHARS) {

src/uu/pinky/src/pinky.rs

@@ -15,7 +15,6 @@ use uucore::utmpx::{self, time, Utmpx};
 
 use std::io::prelude::*;
 use std::io::BufReader;
-use std::io::Result as IOResult;
 
 use std::fs::File;
 use std::os::unix::fs::MetadataExt;
@@ -136,12 +135,8 @@ The utmp file will be {}",
     };
 
     if do_short_format {
-        if let Err(e) = pk.short_pinky() {
+        pk.short_pinky();
-            show_usage_error!("{}", e);
-            1
-        } else {
         0
-        }
     } else {
         pk.long_pinky()
     }
@@ -282,7 +277,7 @@ impl Pinky {
         println!();
     }
 
-    fn short_pinky(&self) -> IOResult<()> {
+    fn short_pinky(&self) {
         if self.include_heading {
             self.print_heading();
         }
@@ -295,7 +290,6 @@ impl Pinky {
                 }
             }
         }
-        Ok(())
     }
 
     fn long_pinky(&self) -> i32 {

src/uu/stdbuf/src/libstdbuf/src/libstdbuf.rs

@@ -35,8 +35,8 @@ extern "C" {
 
 fn set_buffer(stream: *mut FILE, value: &str) {
     let (mode, size): (c_int, size_t) = match value {
-        "0" => (_IONBF, 0 as size_t),
+        "0" => (_IONBF, 0_usize),
-        "L" => (_IOLBF, 0 as size_t),
+        "L" => (_IOLBF, 0_usize),
         input => {
             let buff_size: usize = match input.parse() {
                 Ok(num) => num,

src/uu/stdbuf/src/stdbuf.rs

@@ -141,12 +141,10 @@ fn parse_size(size: &str) -> Option<u64> {
 
 fn check_option(matches: &ArgMatches, name: &str) -> Result<BufferType, ProgramOptionsError> {
     match matches.value_of(name) {
-        Some(value) => match &value[..] {
+        Some(value) => match value {
             "L" => {
                 if name == options::INPUT {
-                    Err(ProgramOptionsError(format!(
+                    Err(ProgramOptionsError("line buffering stdin is meaningless".to_string()))
-                        "line buffering stdin is meaningless"
-                    )))
                 } else {
                     Ok(BufferType::Line)
                 }

src/uu/touch/src/touch.rs

@@ -137,7 +137,7 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
 
     let (mut atime, mut mtime) = if matches.is_present(options::sources::REFERENCE) {
         stat(
-            &matches.value_of(options::sources::REFERENCE).unwrap()[..],
+            matches.value_of(options::sources::REFERENCE).unwrap(),
             !matches.is_present(options::NO_DEREF),
         )
     } else if matches.is_present(options::sources::DATE)

src/uu/tty/src/tty.rs

@@ -65,9 +65,9 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         }
     }
 
-    return if is_stdin_interactive() {
+    if is_stdin_interactive() {
         libc::EXIT_SUCCESS
     } else {
         libc::EXIT_FAILURE
-    };
+    }
 }

src/uucore/src/lib/features/perms.rs

@@ -31,9 +31,9 @@ fn chgrp<P: AsRef<Path>>(path: P, dgid: gid_t, follow: bool) -> IOResult<()> {
     let s = CString::new(path.as_os_str().as_bytes()).unwrap();
     let ret = unsafe {
         if follow {
-            libc::chown(s.as_ptr(), (0 as gid_t).wrapping_sub(1), dgid)
+            libc::chown(s.as_ptr(), 0_u32.wrapping_sub(1), dgid)
         } else {
-            lchown(s.as_ptr(), (0 as gid_t).wrapping_sub(1), dgid)
+            lchown(s.as_ptr(), 0_u32.wrapping_sub(1), dgid)
         }
     };
     if ret == 0 {