test: add -N FILE exists and has been modified since it was last read

Upstream: tests/misc/test-N.sh

src/uu/test/src/parser.rs

@@ -55,8 +55,8 @@ impl Symbol {
                     "-eq" | "-ge" | "-gt" | "-le" | "-lt" | "-ne" => Self::Op(Operator::Int(s)),
                     "-ef" | "-nt" | "-ot" => Self::Op(Operator::File(s)),
                     "-n" | "-z" => Self::UnaryOp(UnaryOperator::StrlenOp(s)),
-                    "-b" | "-c" | "-d" | "-e" | "-f" | "-g" | "-G" | "-h" | "-k" | "-L" | "-O"
+                    "-b" | "-c" | "-d" | "-e" | "-f" | "-g" | "-G" | "-h" | "-k" | "-L" | "-N"
-                    | "-p" | "-r" | "-s" | "-S" | "-t" | "-u" | "-w" | "-x" => {
+                    | "-O" | "-p" | "-r" | "-s" | "-S" | "-t" | "-u" | "-w" | "-x" => {
                         Self::UnaryOp(UnaryOperator::FiletestOp(s))
                     }
                     _ => Self::Literal(s),
@@ -108,7 +108,7 @@ impl Symbol {
 ///   INTOP → -eq | -ge | -gt | -le | -lt | -ne
 ///   FILEOP → -ef | -nt | -ot
 ///   STRLEN → -n | -z
-///   FILETEST → -b | -c | -d | -e | -f | -g | -G | -h | -k | -L | -O | -p |
+///   FILETEST → -b | -c | -d | -e | -f | -g | -G | -h | -k | -L | -N | -O | -p |
 ///               -r | -s | -S | -t | -u | -w | -x
 ///   BOOLOP → -a | -o
 ///

src/uu/test/src/test.rs

@@ -205,6 +205,7 @@ fn eval(stack: &mut Vec<Symbol>) -> Result<bool, String> {
                 "-h" => path(&f, &PathCondition::SymLink),
                 "-k" => path(&f, &PathCondition::Sticky),
                 "-L" => path(&f, &PathCondition::SymLink),
+                "-N" => path(&f, &PathCondition::ExistsModifiedLastRead),
                 "-O" => path(&f, &PathCondition::UserOwns),
                 "-p" => path(&f, &PathCondition::Fifo),
                 "-r" => path(&f, &PathCondition::Readable),
@@ -273,6 +274,7 @@ enum PathCondition {
     CharacterSpecial,
     Directory,
     Exists,
+    ExistsModifiedLastRead,
     Regular,
     GroupIdFlag,
     GroupOwns,
@@ -351,6 +353,9 @@ fn path(path: &OsStr, condition: &PathCondition) -> bool {
         PathCondition::CharacterSpecial => file_type.is_char_device(),
         PathCondition::Directory => file_type.is_dir(),
         PathCondition::Exists => true,
+        PathCondition::ExistsModifiedLastRead => {
+            metadata.accessed().unwrap() < metadata.modified().unwrap()
+        }
         PathCondition::Regular => file_type.is_file(),
         PathCondition::GroupIdFlag => metadata.mode() & S_ISGID != 0,
         PathCondition::GroupOwns => metadata.gid() == getegid(),

tests/by-util/test_test.rs

@@ -882,3 +882,16 @@ fn test_bracket_syntax_version() {
         .succeeds()
         .stdout_matches(&r"\[ \d+\.\d+\.\d+".parse().unwrap());
 }
+
+#[test]
+#[allow(non_snake_case)]
+fn test_file_N() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+    scene.ucmd().args(&["-N", "regular_file"]).fails();
+    // The file will have different create/modified data
+    // so, test -N will return 0
+    sleep(std::time::Duration::from_millis(1000));
+    at.touch("regular_file");
+    scene.ucmd().args(&["-N", "regular_file"]).succeeds();
+}