From 7b219aee635a38739869a2076c9f034949b36738 Mon Sep 17 00:00:00 2001
From: Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
Date: Sat, 2 Mar 2024 03:14:13 +0100
Subject: [PATCH] cksum: implement trivial --tag flag

---
 src/uu/cksum/src/cksum.rs   |  8 ++++++++
 tests/by-util/test_cksum.rs | 22 ++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/src/uu/cksum/src/cksum.rs b/src/uu/cksum/src/cksum.rs
index 6cf04b797..5e9e6f30b 100644
--- a/src/uu/cksum/src/cksum.rs
+++ b/src/uu/cksum/src/cksum.rs
@@ -286,6 +286,7 @@ mod options {
     pub const ALGORITHM: &str = "algorithm";
     pub const FILE: &str = "file";
     pub const UNTAGGED: &str = "untagged";
+    pub const TAG: &str = "tag";
     pub const LENGTH: &str = "length";
     pub const RAW: &str = "raw";
 }
@@ -396,6 +397,13 @@ pub fn uu_app() -> Command {
             Arg::new(options::UNTAGGED)
                 .long(options::UNTAGGED)
                 .help("create a reversed style checksum, without digest type")
+                .action(ArgAction::SetTrue)
+                .overrides_with(options::TAG),
+        )
+        .arg(
+            Arg::new(options::TAG)
+                .long(options::TAG)
+                .help("create a BSD style checksum, undo --untagged (default)")
                 .action(ArgAction::SetTrue),
         )
         .arg(
diff --git a/tests/by-util/test_cksum.rs b/tests/by-util/test_cksum.rs
index f07261b74..5e66b572a 100644
--- a/tests/by-util/test_cksum.rs
+++ b/tests/by-util/test_cksum.rs
@@ -140,6 +140,17 @@ fn test_repeated_flags() {
         .stdout_is_fixture("md5_single_file.expected");
 }
 
+#[test]
+fn test_tag_after_untagged() {
+    new_ucmd!()
+        .arg("--untagged")
+        .arg("--tag")
+        .arg("-a=md5")
+        .arg("lorem_ipsum.txt")
+        .succeeds()
+        .stdout_is_fixture("md5_single_file.expected");
+}
+
 #[test]
 fn test_algorithm_single_file() {
     for algo in ALGOS {
@@ -220,6 +231,17 @@ fn test_untagged_algorithm_single_file() {
     }
 }
 
+#[test]
+fn test_untagged_algorithm_after_tag() {
+    new_ucmd!()
+        .arg("--tag")
+        .arg("--untagged")
+        .arg("--algorithm=md5")
+        .arg("lorem_ipsum.txt")
+        .succeeds()
+        .stdout_is_fixture("untagged/md5_single_file.expected");
+}
+
 #[test]
 fn test_untagged_algorithm_multiple_files() {
     for algo in ALGOS {