Merge pull request #6160 from mvo5/date-from-stdin

date: support `-f -` to read from stdin

src/uu/date/src/date.rs

@@ -91,6 +91,7 @@ enum DateSource {
  Now,
  Custom(String),
  File(PathBuf),
+ Stdin,
  Human(TimeDelta),
 }
 
@@ -173,7 +174,10 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
  DateSource::Custom(date.into())
  }
  } else if let Some(file) = matches.get_one::<String>(OPT_FILE) {
- DateSource::File(file.into())
+ match file.as_ref() {
+ "-" => DateSource::Stdin,
+ _ => DateSource::File(file.into()),
+ }
  } else {
  DateSource::Now
  };
@@ -240,6 +244,11 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
  }
  }
  }
+ DateSource::Stdin => {
+ let lines = BufReader::new(std::io::stdin()).lines();
+ let iter = lines.map_while(Result::ok).map(parse_date);
+ Box::new(iter)
+ }
  DateSource::File(ref path) => {
  if path.is_dir() {
  return Err(USimpleError::new(

tests/by-util/test_date.rs

@@ -426,3 +426,21 @@ fn test_date_parse_from_format() {
  .arg("+%Y-%m-%d %H:%M:%S")
  .succeeds();
 }
+
+#[test]
+fn test_date_from_stdin() {
+ new_ucmd!()
+ .arg("-f")
+ .arg("-")
+ .pipe_in(
+ "2023-03-27 08:30:00\n\
+ 2023-04-01 12:00:00\n\
+ 2023-04-15 18:30:00\n",
+ )
+ .succeeds()
+ .stdout_is(
+ "Mon Mar 27 08:30:00 2023\n\
+ Sat Apr 1 12:00:00 2023\n\
+ Sat Apr 15 18:30:00 2023\n",
+ );
+}