tail: remove collapsible_if

Author: oech3

src/uu/tail/src/tail.rs

@@ -27,7 +27,6 @@ use chunks::ReverseChunks;
 use follow::Observer;
 use memchr::{memchr_iter, memrchr_iter};
 use paths::{FileExtTail, HeaderPrinter, Input, InputKind};
-use same_file::Handle;
 use std::cmp::Ordering;
 use std::fs::File;
 use std::io::{self, BufReader, BufWriter, ErrorKind, Read, Seek, SeekFrom, Write, stdin, stdout};
@@ -117,21 +116,21 @@ fn tail_file(
     observer: &mut Observer,
     offset: u64,
 ) -> UResult<()> {
-    let md = path.metadata();
-    if let Err(ref e) = md {
-        if e.kind() == ErrorKind::NotFound {
-            set_exit_code(1);
-            show_error!(
-                "{}",
-                translate!(
-                    "tail-error-cannot-open-no-such-file",
-                    "file" => input.display_name.clone(),
-                    "error" => translate!("tail-no-such-file-or-directory")
-                )
-            );
-            observer.add_bad_path(path, input.display_name.as_str(), false)?;
-            return Ok(());
-        }
+    if path
+        .metadata()
+        .is_err_and(|e| e.kind() == ErrorKind::NotFound)
+    {
+        set_exit_code(1);
+        show_error!(
+            "{}",
+            translate!(
+                "tail-error-cannot-open-no-such-file",
+                "file" => input.display_name.clone(),
+                "error" => translate!("tail-no-such-file-or-directory")
+            )
+        );
+        observer.add_bad_path(path, input.display_name.as_str(), false)?;
+        return Ok(());
     }
 
     if path.is_dir() {
@@ -287,17 +286,14 @@ fn tail_stdin(
     }
 
     if let Some(path) = input.resolve() {
-        // fifo
-        let mut stdin_offset = 0;
-        if cfg!(unix) {
-            // Save the current seek position/offset of a stdin redirected file.
-            // This is needed to pass "gnu/tests/tail-2/start-middle.sh"
-            if let Ok(mut stdin_handle) = Handle::stdin() {
-                if let Ok(offset) = stdin_handle.as_file_mut().stream_position() {
-                    stdin_offset = offset;
-                }
-            }
-        }
+        #[cfg(not(unix))]
+        let stdin_offset = 0;
+        // Save the current seek position/offset of a stdin redirected file.
+        // This is needed to pass "gnu/tests/tail-2/start-middle.sh"
+        #[cfg(unix)]
+        let stdin_offset = same_file::Handle::stdin()
+            .and_then(|mut h| h.as_file_mut().stream_position())
+            .unwrap_or(0); // fifo
         tail_file(
             settings,
             header_printer,
@@ -433,10 +429,8 @@ fn backwards_thru_file(file: &mut File, num_delimiters: u64, delimiter: u8) {
 
         // Ignore a trailing newline in the last block, if there is one.
         if first_slice {
-            if let Some(c) = slice.last() {
-                if *c == delimiter {
-                    iter.next();
-                }
+            if slice.last().is_some_and(|&c| c == delimiter) {
+                iter.next();
             }
             first_slice = false;
         }