address review: replace print macros with structured logging

Signed-off-by: SAY-5 <saiasish.cnp@gmail.com>

Cargo.toml

@@ -93,6 +93,8 @@ unused_qualifications = "warn"
 all = { level = "warn", priority = -1 }
 cargo = { level = "warn", priority = -1 }
 pedantic = { level = "warn", priority = -1 }
+print_stdout = "warn"                        # restriction: forbid print/println macros
+print_stderr = "warn"                        # restriction: forbid eprint/eprintln macros
 use_self = "warn"                            # nursery lint
 cargo_common_metadata = "allow"              # 3240
 multiple_crate_versions = "allow"            # 2882

src/main.rs

@@ -46,13 +46,9 @@ fn uu_main() -> Result<()> {
             return Ok(());
         }
     };
-    // Avoid `println!`, which panics on broken pipe / ENOSPC (e.g. `>/dev/full`).
-    // Match the uutils convention: silently exit on BrokenPipe, report other I/O
-    // errors to stderr and exit with failure.
-    if let Err(e) = writeln!(io::stdout(), "---\n{ast}") {
-        if e.kind() == io::ErrorKind::BrokenPipe {
-            return Ok(());
-        }
+    if let Err(e) = writeln!(io::stdout(), "---\n{ast}")
+        && e.kind() != io::ErrorKind::BrokenPipe
+    {
         exit_err(Some(format!("awk: error writing to standard output: {e}")));
     }
     dbg!(arena.chunk_capacity());

src/utils.rs

@@ -4,6 +4,7 @@
 // files that was distributed with this source code.
 
 use std::fmt::{Debug, Display};
+use std::io::{self, Write};
 use std::panic::{UnwindSafe, catch_unwind, set_hook, take_hook};
 use std::process::exit;
 
@@ -73,7 +74,7 @@ pub fn exit_with(res: Result<Option<impl Into<ExitCode>>, impl Display + Debug>)
 
 pub fn exit_err(err: Option<impl Display + Debug>) -> ! {
     if let Some(err) = err {
-        eprintln!("{err}");
+        let _ = writeln!(io::stderr(), "{err}");
     }
     exit(EXIT_FAILURE)
 }