rust: fix issues reported by clippy

fish-rust/build.rs

@@ -38,7 +38,7 @@ fn main() -> miette::Result<()> {
     // Emit autocxx junk.
     // This allows "C++ to be used from Rust."
     let include_paths = [&fish_src_dir, &fish_build_dir, &cxx_include_dir];
-    let mut b = autocxx_build::Builder::new("src/ffi.rs", &include_paths)
+    let mut b = autocxx_build::Builder::new("src/ffi.rs", include_paths)
         .custom_gendir(autocxx_gen_dir.into())
         .build()?;
     b.flag_if_supported("-std=c++11")

fish-rust/src/fd_readable_set.rs

@@ -158,7 +158,7 @@ impl fd_readable_set_t {
                 self.pollfds_.insert(
                     pos,
                     libc::pollfd {
-                        fd: fd,
+                        fd,
                         events: libc::POLLIN,
                         revents: 0,
                     },

fish-rust/src/ffi_tests.rs

@@ -7,8 +7,6 @@
 
 #[cfg(all(feature = "fish-ffi-tests", not(test)))]
 mod ffi_tests_impl {
-    use inventory;
-
     /// A test which needs to cross the FFI.
     #[derive(Debug)]
     pub struct FFITest {

fish-rust/src/flog.rs

@@ -169,13 +169,13 @@ fn apply_one_wildcard(wc_esc: &wstr, sense: bool) {
     let wc = parse_util_unescape_wildcards(&wc_esc.to_ffi());
     let mut match_found = false;
     for cat in categories::all_categories() {
-        if wildcard_match(&cat.name.to_ffi(), &*wc, false) {
+        if wildcard_match(&cat.name.to_ffi(), &wc, false) {
             cat.enabled.store(sense, Ordering::Relaxed);
             match_found = true;
         }
     }
     if !match_found {
-        eprintln!("Failed to match debug category: {}\n", wc_esc);
+        eprintln!("Failed to match debug category: {wc_esc}\n");
     }
 }
 

fish-rust/src/topic_monitor.rs

@@ -377,7 +377,7 @@ static mut s_principal: *const topic_monitor_t = std::ptr::null();
 
 /// Create a new topic monitor. Exposed for the FFI.
 pub fn new_topic_monitor() -> Box<topic_monitor_t> {
-    Box::new(topic_monitor_t::default())
+    Box::default()
 }
 
 impl topic_monitor_t {

fish-rust/src/util.rs

@@ -2,6 +2,7 @@
 
 use crate::ffi::wcharz_t;
 use crate::wchar::wstr;
+use std::cmp::Ordering;
 use std::time;
 
 #[cxx::bridge]
@@ -80,16 +81,20 @@ pub fn wcsfilecmp(a: wcharz_t, b: wcharz_t) -> i32 {
         acl = acl.to_uppercase().next().unwrap();
         bcl = bcl.to_uppercase().next().unwrap();
 
-        if acl < bcl {
+        match acl.cmp(&bcl) {
+            Ordering::Less => {
                 retval = -1;
                 break;
-        } else if acl > bcl {
-            retval = 1;
-            break;
-        } else {
+            }
+            Ordering::Equal => {
                 ai += 1;
                 bi += 1;
             }
+            Ordering::Greater => {
+                retval = 1;
+                break;
+            }
+        }
     }
 
     if retval != 0 {
@@ -152,16 +157,20 @@ pub fn wcsfilecmp_glob(a: wcharz_t, b: wcharz_t) -> i32 {
         // TODO Compare the tail (enabled by Rust's Unicode support).
         let acl = ac.to_lowercase().next().unwrap();
         let bcl = bc.to_lowercase().next().unwrap();
-        if acl < bcl {
+        match acl.cmp(&bcl) {
+            Ordering::Less => {
                 retval = -1;
                 break;
-        } else if acl > bcl {
-            retval = 1;
-            break;
-        } else {
+            }
+            Ordering::Equal => {
                 ai += 1;
                 bi += 1;
             }
+            Ordering::Greater => {
+                retval = 1;
+                break;
+            }
+        }
     }
 
     if retval != 0 {

fish-rust/src/wchar_ext.rs

@@ -32,18 +32,18 @@ impl<'a> CharPrefixSuffix for &'a wstr {
 impl<'a> CharPrefixSuffix for &'a WString {
     type Iter = CharsUtf32<'a>;
     fn chars(self) -> Self::Iter {
-        wstr::chars(&*self)
+        wstr::chars(self)
     }
 }
 
 /// \return true if \p prefix is a prefix of \p contents.
-fn iter_prefixes_iter<Prefix, Contents>(mut prefix: Prefix, mut contents: Contents) -> bool
+fn iter_prefixes_iter<Prefix, Contents>(prefix: Prefix, mut contents: Contents) -> bool
 where
     Prefix: Iterator,
     Contents: Iterator,
     Prefix::Item: PartialEq<Contents::Item>,
 {
-    while let Some(c1) = prefix.next() {
+    for c1 in prefix {
         match contents.next() {
             Some(c2) if c1 == c2 => {}
             _ => return false,

fish-rust/src/wgetopt.rs

@@ -149,7 +149,7 @@ pub struct woption<'a> {
 }
 
 /// Helper function to create a woption.
-pub const fn wopt<'a>(name: &'a wstr, has_arg: woption_argument_t, val: char) -> woption<'a> {
+pub const fn wopt(name: &wstr, has_arg: woption_argument_t, val: char) -> woption<'_> {
     woption { name, has_arg, val }
 }
 
@@ -368,7 +368,7 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
         if temp.char_at(2) == ':' {
             // This is an option that accepts an argument optionally.
             if !self.nextchar.is_empty() {
-                self.woptarg = Some(self.nextchar.clone());
+                self.woptarg = Some(self.nextchar);
                 self.woptind += 1;
             } else {
                 self.woptarg = None;
@@ -377,7 +377,7 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
         } else {
             // This is an option that requires an argument.
             if !self.nextchar.is_empty() {
-                self.woptarg = Some(self.nextchar.clone());
+                self.woptarg = Some(self.nextchar);
                 // If we end this ARGV-element by taking the rest as an arg, we must advance to
                 // the next element now.
                 self.woptind += 1;
@@ -447,10 +447,9 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
         indfound: &mut usize,
     ) -> Option<woption<'opts>> {
         let mut pfound: Option<woption> = None;
-        let mut option_index = 0;
 
         // Test all long options for either exact match or abbreviated matches.
-        for p in self.longopts.iter() {
+        for (option_index, p) in self.longopts.iter().enumerate() {
             if p.name.starts_with(&self.nextchar[..nameend]) {
                 // Exact match found.
                 pfound = Some(*p);
@@ -465,7 +464,6 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
                 // Second or later nonexact match found.
                 *ambig = true;
             }
-            option_index += 1;
         }
         return pfound;
     }
@@ -586,17 +584,20 @@ impl<'opts, 'args, 'argarray> wgetopter_t<'opts, 'args, 'argarray> {
         // This distinction seems to be the most useful approach.
         if !self.longopts.is_empty() && self.woptind < self.argc() {
             let arg = self.argv[self.woptind];
-            let mut try_long = false;
-            if arg.char_at(0) == '-' && arg.char_at(1) == '-' {
+
+            let try_long = if arg.char_at(0) == '-' && arg.char_at(1) == '-' {
                 // Like --foo
-                try_long = true;
+                true
             } else if long_only && arg.len() >= 3 {
                 // Like -fu
-                try_long = true;
+                true
             } else if !self.shortopts.as_char_slice().contains(&arg.char_at(1)) {
                 // Like -f, but f is not a short arg.
-                try_long = true;
-            }
+                true
+            } else {
+                false
+            };
+
             if try_long {
                 let mut retval = '\0';
                 if self._handle_long_opt(longind, long_only, &mut retval) {

fish-rust/src/wutil/format/format.rs

@@ -94,7 +94,7 @@ impl Printf for u64 {
         .try_into()
         .unwrap_or_default();
         let formatted = if spec.left_adj {
-            let mut num_str = prefix.clone();
+            let mut num_str = prefix;
             num_str.extend(rev_num.chars().rev());
             while num_str.len() < width {
                 num_str.push(' ');
@@ -104,11 +104,11 @@ impl Printf for u64 {
             while prefix.len() + rev_num.len() < width {
                 rev_num.push('0');
             }
-            let mut num_str = prefix.clone();
+            let mut num_str = prefix;
             num_str.extend(rev_num.chars().rev());
             num_str
         } else {
-            let mut num_str = prefix.clone();
+            let mut num_str = prefix;
             num_str.extend(rev_num.chars().rev());
             while num_str.len() < width {
                 num_str.insert(0, ' ');
@@ -359,7 +359,7 @@ impl Printf for f64 {
                         rev_tail_str.push((b'0' + (tail % 10) as u8) as char);
                         tail /= 10;
                     }
-                    number.push_str(&format!("{}", int_part));
+                    number.push_str(&int_part.to_string());
                     number.push('.');
                     number.extend(rev_tail_str.chars().rev());
                     if strip_trailing_0s {
@@ -371,9 +371,8 @@ impl Printf for f64 {
                     number.push_str(&format!("{}", normal.round()));
                 }
                 number.push(exp_symb);
-                number.push_str(&format!("{:+03}", exponent));
-            } else {
-                if precision > 0 {
+                number.push_str(&format!("{exponent:+03}"));
+            } else if precision > 0 {
                 let mut int_part = abs.trunc();
                 let exp_factor = 10.0_f64.powf(precision as f64);
                 let mut tail = ((abs - int_part) * exp_factor).round() as u64;
@@ -389,7 +388,7 @@ impl Printf for f64 {
                     rev_tail_str.push((b'0' + (tail % 10) as u8) as char);
                     tail /= 10;
                 }
-                    number.push_str(&format!("{}", int_part));
+                number.push_str(&int_part.to_string());
                 number.push('.');
                 number.extend(rev_tail_str.chars().rev());
                 if strip_trailing_0s {
@@ -400,7 +399,6 @@ impl Printf for f64 {
             } else {
                 number.push_str(&format!("{}", abs.round()));
             }
-            }
         } else {
             // not finite
             match spec.conversion_type {

fish-rust/src/wutil/gettext.rs

@@ -6,10 +6,7 @@ use crate::wchar_ffi::wcslen;
 
 /// Implementation detail for wgettext!.
 pub fn wgettext_impl_do_not_use_directly(text: &[wchar_t]) -> &'static wstr {
-    assert!(
-        text.len() > 0 && text[text.len() - 1] == 0,
-        "should be nul-terminated"
-    );
+    assert_eq!(text.last(), Some(&0), "should be nul-terminated");
     let res: *const wchar_t = ffi::wgettext_ptr(text.as_ptr());
     let slice = unsafe { std::slice::from_raw_parts(res as *const u32, wcslen(res)) };
     wstr::from_slice(slice).expect("Invalid UTF-32")

fish-rust/src/wutil/wcstoi.rs

@@ -35,11 +35,7 @@ where
     Chars: Iterator<Item = char>,
 {
     if let Some(r) = mradix {
-        assert!(
-            (2..=36).contains(&r),
-            "fish_parse_radix: invalid radix {}",
-            r
-        );
+        assert!((2..=36).contains(&r), "fish_parse_radix: invalid radix {r}");
     }
     let chars = &mut ichars.peekable();
 
@@ -63,17 +59,16 @@ where
     }
 
     // Determine the radix.
-    let radix;
-    if mradix.is_some() {
-        radix = mradix.unwrap();
+    let radix = if let Some(radix) = mradix {
+        radix
     } else if current(chars) == '0' {
         chars.next();
         match current(chars) {
             'x' | 'X' => {
                 chars.next();
-                radix = 16;
+                16
             }
-            c if '0' <= c && c <= '9' => radix = 8,
+            c if ('0'..='9').contains(&c) => 8,
             _ => {
                 // Just a 0.
                 return Ok(ParseResult {
@@ -83,8 +78,8 @@ where
             }
         }
     } else {
-        radix = 10;
-    }
+        10
+    };
 
     // Compute as u64.
     let mut consumed1 = false;