tac: update to clap 4

src/uu/tac/Cargo.toml

@@ -20,7 +20,7 @@ path = "src/tac.rs"
 memchr = "2"
 memmap2 = "0.5"
 regex = "1"
-clap = { version = "3.2", features = ["wrap_help", "cargo"] }
+clap = { version = "4.0", features = ["wrap_help", "cargo"] }
 uucore = { version=">=0.0.16", package="uucore", path="../../uucore" }
 
 [[bin]]

src/uu/tac/src/tac.rs

@@ -8,7 +8,7 @@
 // spell-checker:ignore (ToDO) sbytes slen dlen memmem memmap Mmap mmap SIGBUS
 mod error;
 
-use clap::{crate_version, Arg, Command};
+use clap::{crate_version, Arg, ArgAction, Command};
 use memchr::memmem;
 use memmap2::Mmap;
 use std::io::{stdin, stdout, BufWriter, Read, Write};
@@ -40,8 +40,8 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
 
     let matches = uu_app().try_get_matches_from(args)?;
 
-    let before = matches.contains_id(options::BEFORE);
-    let regex = matches.contains_id(options::REGEX);
+    let before = matches.get_flag(options::BEFORE);
+    let regex = matches.get_flag(options::REGEX);
     let raw_separator = matches
         .get_one::<String>(options::SEPARATOR)
         .map(|s| s.as_str())
@@ -60,7 +60,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     tac(&files, before, regex, separator)
 }
 
-pub fn uu_app<'a>() -> Command<'a> {
+pub fn uu_app() -> Command {
     Command::new(uucore::util_name())
         .name(NAME)
         .version(crate_version!())
@@ -72,26 +72,26 @@ pub fn uu_app<'a>() -> Command<'a> {
                 .short('b')
                 .long(options::BEFORE)
                 .help("attach the separator before instead of after")
-                .takes_value(false),
+                .action(ArgAction::SetTrue),
         )
         .arg(
             Arg::new(options::REGEX)
                 .short('r')
                 .long(options::REGEX)
                 .help("interpret the sequence as a regular expression")
-                .takes_value(false),
+                .action(ArgAction::SetTrue),
         )
         .arg(
             Arg::new(options::SEPARATOR)
                 .short('s')
                 .long(options::SEPARATOR)
                 .help("use STRING as the separator instead of newline")
-                .takes_value(true),
+                .value_name("STRING"),
         )
         .arg(
             Arg::new(options::FILE)
                 .hide(true)
-                .multiple_occurrences(true)
+                .action(ArgAction::Append)
                 .value_hint(clap::ValueHint::FilePath),
         )
 }