Fix mktemp -t -p ~/projects/playground foo.XXXX

src/uu/mktemp/src/mktemp.rs

@@ -191,7 +191,9 @@ impl Options {
                     (tmpdir, template.to_string())
                 }
                 Some(template) => {
-                    let tmpdir = if matches.get_flag(OPT_T) {
+                    let tmpdir = if matches.contains_id(OPT_TMPDIR) {
+                        matches.get_one::<String>(OPT_TMPDIR).map(String::from)
+                    } else if matches.get_flag(OPT_T) {
                         // mktemp -t foo.xxx should export in TMPDIR
                         Some(env::temp_dir().display().to_string())
                     } else {

tests/by-util/test_mktemp.rs

@@ -872,3 +872,19 @@ fn test_default_issue_4821_t_tmpdir() {
     println!("stdout = {stdout}");
     assert!(stdout.contains(&pathname));
 }
+
+#[test]
+fn test_default_issue_4821_t_tmpdir_p() {
+    let scene = TestScenario::new(util_name!());
+    let pathname = scene.fixtures.as_string();
+    let result = scene
+        .ucmd()
+        .arg("-t")
+        .arg("-p")
+        .arg(&pathname)
+        .arg("foo.XXXX")
+        .succeeds();
+    let stdout = result.stdout_str();
+    println!("stdout = {stdout}");
+    assert!(stdout.contains(&pathname));
+}