From 2ca1a10e4d475171bfdc9ebf7e5b55395166351e Mon Sep 17 00:00:00 2001
From: Bipul Lamsal <66175991+BipulLamsal@users.noreply.github.com>
Date: Fri, 10 Apr 2026 21:44:18 +0545
Subject: [PATCH] numfmt: fix --to=auto to return with exitcode=1 (#11701)

* numfmt: fix --to=auto to return with exitcode=1

* numfmt: update direct variable use in format macro

* numfmt_test: remove extra test

* numfmt: replacing format in translate directly
---
 src/uu/numfmt/locales/en-US.ftl |  2 +-
 src/uu/numfmt/src/format.rs     |  6 +++++-
 src/uu/numfmt/src/numfmt.rs     | 12 +++++++-----
 tests/by-util/test_numfmt.rs    |  6 +-----
 4 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/src/uu/numfmt/locales/en-US.ftl b/src/uu/numfmt/locales/en-US.ftl
index c0e2c5722..b1a773ac5 100644
--- a/src/uu/numfmt/locales/en-US.ftl
+++ b/src/uu/numfmt/locales/en-US.ftl
@@ -68,7 +68,7 @@ numfmt-error-invalid-number = invalid number: { $input }
 numfmt-error-missing-i-suffix = missing 'i' suffix in input: '{ $number }{ $suffix }' (e.g Ki/Mi/Gi)
 numfmt-error-rejecting-suffix = rejecting suffix in input: '{ $number }{ $suffix }' (consider using --from)
 numfmt-error-suffix-unsupported-for-unit = This suffix is unsupported for specified unit
-numfmt-error-unit-auto-not-supported-with-to = Unit 'auto' isn't supported with --to options
+numfmt-error-invalid-unit-argument = invalid argument '{$arg}' for '{$opt}'
 numfmt-error-number-too-big = Number is too big and unsupported
 numfmt-error-format-no-percent = format '{ $format }' has no % directive
 numfmt-error-format-ends-in-percent = format '{ $format }' ends in %
diff --git a/src/uu/numfmt/src/format.rs b/src/uu/numfmt/src/format.rs
index f699536fd..28e32631c 100644
--- a/src/uu/numfmt/src/format.rs
+++ b/src/uu/numfmt/src/format.rs
@@ -475,7 +475,11 @@ fn consider_suffix(
     let (bases, with_i) = match u {
         Unit::Si => (si_bases_f64(), false),
         Unit::Iec(with_i) => (iec_bases_f64(), with_i),
-        Unit::Auto => return Err(translate!("numfmt-error-unit-auto-not-supported-with-to")),
+        Unit::Auto => {
+            return Err(
+                translate!("numfmt-error-invalid-unit-argument", "arg" => "auto", "opt" => "--to"),
+            );
+        }
         Unit::None => return Ok((n, None)),
     };
 
diff --git a/src/uu/numfmt/src/numfmt.rs b/src/uu/numfmt/src/numfmt.rs
index 7b3605d37..78202dcbd 100644
--- a/src/uu/numfmt/src/numfmt.rs
+++ b/src/uu/numfmt/src/numfmt.rs
@@ -165,14 +165,16 @@ fn handle_buffer<R: BufRead>(mut input: R, options: &NumfmtOptions) -> UResult<b
     Ok(saw_invalid)
 }
 
-fn parse_unit(s: &str) -> Result<Unit> {
+fn parse_unit(s: &str, opt: &str) -> Result<Unit> {
     match s {
-        "auto" => Ok(Unit::Auto),
+        "auto" if opt != TO => Ok(Unit::Auto),
         "si" => Ok(Unit::Si),
         "iec" => Ok(Unit::Iec(false)),
         "iec-i" => Ok(Unit::Iec(true)),
         "none" => Ok(Unit::None),
-        _ => Err(translate!("numfmt-error-unsupported-unit")),
+        value => Err(
+            translate!("numfmt-error-invalid-unit-argument", "arg" => value, "opt" => format!("--{opt}")),
+        ),
     }
 }
 
@@ -237,8 +239,8 @@ fn parse_delimiter(arg: &OsString) -> Result<Vec<u8>> {
 }
 
 fn parse_options(args: &ArgMatches) -> Result<NumfmtOptions> {
-    let from = parse_unit(args.get_one::<String>(FROM).unwrap())?;
-    let to = parse_unit(args.get_one::<String>(TO).unwrap())?;
+    let from = parse_unit(args.get_one::<String>(FROM).unwrap(), FROM)?;
+    let to = parse_unit(args.get_one::<String>(TO).unwrap(), TO)?;
     let from_unit = parse_unit_size(args.get_one::<String>(FROM_UNIT).unwrap())?;
     let to_unit = parse_unit_size(args.get_one::<String>(TO_UNIT).unwrap())?;
 
diff --git a/tests/by-util/test_numfmt.rs b/tests/by-util/test_numfmt.rs
index 132299954..4d63708ba 100644
--- a/tests/by-util/test_numfmt.rs
+++ b/tests/by-util/test_numfmt.rs
@@ -1411,12 +1411,8 @@ fn test_scientific_notation_rejected_by_gnu_issue_11655() {
         .stderr_contains("invalid suffix in input");
 }
 
-// https://github.com/uutils/coreutils/issues/11662
-// `--to=auto` is accepted at parse time by uutils then rejected at runtime
-// with exit code 2; GNU rejects it in option parsing with exit code 1.
 #[test]
-#[ignore = "GNU compat: see uutils/coreutils#11662"]
-fn test_to_auto_rejected_at_parse_time_issue_11662() {
+fn test_to_auto_rejected_at_parse_time() {
     new_ucmd!()
         .args(&["--to=auto", "100"])
         .fails_with_code(1)