clippy: fix map_unwrap_or lint

https://rust-lang.github.io/rust-clippy/master/index.html#map_unwrap_or

Author: xtqqczze

src/uu/cat/src/platform/windows.rs

@@ -20,9 +20,7 @@ pub fn is_unsafe_overwrite<I: AsHandleRef, O: AsHandleRef>(input: &I, output: &O
     }
 
     // Check if the output file is empty
-    FileInformation::from_file(output)
-        .map(|info| info.file_size() > 0)
-        .unwrap_or(false)
+    FileInformation::from_file(output).is_ok_and(|info| info.file_size() > 0)
 }
 
 /// Get the file path for a file handle

src/uucore/build.rs

@@ -350,9 +350,7 @@ fn embed_locale_file(
 /// Check if we are cross-compiling for WASI (build.rs runs on the host,
 /// so `#[cfg(target_os = "wasi")]` does not work here).
 fn is_wasi_target() -> bool {
-    env::var("CARGO_CFG_TARGET_OS")
-        .map(|os| os == "wasi")
-        .unwrap_or(false)
+    env::var("CARGO_CFG_TARGET_OS").is_ok_and(|os| os == "wasi")
 }
 
 /// For WASI/WASM builds, embed ALL available .ftl files in a locale

src/uucore/src/lib/features/pipes.rs

@@ -67,9 +67,7 @@ pub fn splice_exact(source: &impl AsFd, target: &impl AsFd, len: usize) -> std::
 #[inline]
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn might_fuse(source: &impl AsFd) -> bool {
-    rustix::fs::fstatfs(source)
-        .map(|stats| stats.f_type == 0x6573_5546) // FUSE magic number, too many platform specific clippy warning with const
-        .unwrap_or(true)
+    rustix::fs::fstatfs(source).map_or(true, |stats| stats.f_type == 0x6573_5546) // FUSE magic number, too many platform specific clippy warning with const
 }
 
 /// Return verified /dev/null

tests/by-util/test_df.rs

@@ -1054,8 +1054,7 @@ fn test_nonexistent_file() {
 fn test_df_all_shows_binfmt_misc() {
     // Check if binfmt_misc is mounted
     let is_mounted = std::fs::read_to_string("/proc/self/mountinfo")
-        .map(|content| content.lines().any(|line| line.contains("binfmt_misc")))
-        .unwrap_or(false);
+        .is_ok_and(|content| content.lines().any(|line| line.contains("binfmt_misc")));
 
     if is_mounted {
         let output = new_ucmd!()
@@ -1076,8 +1075,7 @@ fn test_df_all_shows_binfmt_misc() {
 fn test_df_hides_binfmt_misc_by_default() {
     // Check if binfmt_misc is mounted
     let is_mounted = std::fs::read_to_string("/proc/self/mountinfo")
-        .map(|content| content.lines().any(|line| line.contains("binfmt_misc")))
-        .unwrap_or(false);
+        .is_ok_and(|content| content.lines().any(|line| line.contains("binfmt_misc")));
 
     if is_mounted {
         let output = new_ucmd!()

tests/uutests/src/lib/util.rs

@@ -109,8 +109,7 @@ pub fn is_locale_available(locale: &str) -> bool {
         .env("LC_ALL", locale)
         .arg("charmap")
         .output()
-        .map(|o| String::from_utf8_lossy(&o.stdout).trim() == "UTF-8")
-        .unwrap_or(false)
+        .is_ok_and(|o| String::from_utf8_lossy(&o.stdout).trim() == "UTF-8")
 }
 
 /// Read a test scenario fixture, returning its bytes