tail: clean up some small things in input parsing

src/uu/tail/src/args.rs

@@ -7,7 +7,7 @@
 
 use crate::paths::Input;
 use crate::{parse, platform, Quotable};
-use clap::crate_version;
+use clap::{crate_version, value_parser};
 use clap::{Arg, ArgAction, ArgMatches, Command};
 use fundu::DurationParser;
 use is_terminal::IsTerminal;
@@ -283,7 +283,7 @@ impl Settings {
         }
 
         settings.inputs = matches
-            .get_raw(options::ARG_FILES)
+            .get_many::<OsString>(options::ARG_FILES)
             .map(|v| v.map(Input::from).collect())
             .unwrap_or_else(|| vec![Input::default()]);
 
@@ -584,6 +584,7 @@ pub fn uu_app() -> Command {
             Arg::new(options::ARG_FILES)
                 .action(ArgAction::Append)
                 .num_args(1..)
+                .value_parser(value_parser!(OsString))
                 .value_hint(clap::ValueHint::FilePath),
         )
 }

src/uu/tail/src/paths.rs

@@ -10,10 +10,7 @@ use std::ffi::OsStr;
 use std::fs::{File, Metadata};
 use std::io::{Seek, SeekFrom};
 #[cfg(unix)]
-use std::os::unix::{
-    fs::{FileTypeExt, MetadataExt},
-    prelude::OsStrExt,
-};
+use std::os::unix::fs::{FileTypeExt, MetadataExt};
 use std::path::{Path, PathBuf};
 use uucore::error::UResult;
 
@@ -26,9 +23,7 @@ pub enum InputKind {
 #[cfg(unix)]
 impl From<&OsStr> for InputKind {
     fn from(value: &OsStr) -> Self {
-        const DASH: [u8; 1] = [b'-'];
-
-        if value.as_bytes() == DASH {
+        if value == OsStr::new("-") {
             Self::Stdin
         } else {
             Self::File(PathBuf::from(value))