date: refactor date printing into its own method

src/uu/date/src/date.rs

@@ -250,6 +250,33 @@ impl DateSource {
  }
 }
 
+fn print_date(format_string: &str, date: DateTime<FixedOffset>) -> UResult<()> {
+ // GNU `date` uses `%N` for nano seconds, however crate::chrono uses `%f`
+ let format_string = &format_string.replace("%N", "%f");
+ // Refuse to pass this string to chrono as it is crashing in this crate
+ if format_string.contains("%#z") {
+ return Err(USimpleError::new(
+ 1,
+ format!("invalid format {}", format_string.replace("%f", "%N")),
+ ));
+ }
+ // Hack to work around panic in chrono,
+ // TODO - remove when a fix for https:/chronotope/chrono/issues/623 is released
+ let format_items = StrftimeItems::new(format_string);
+ if format_items.clone().any(|i| i == Item::Error) {
+ return Err(USimpleError::new(
+ 1,
+ format!("invalid format {}", format_string.replace("%f", "%N")),
+ ));
+ }
+ let formatted = date
+ .format_with_items(format_items)
+ .to_string()
+ .replace("%f", "%N");
+ println!("{formatted}");
+ Ok(())
+}
+
 #[uucore::main]
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
  let matches = uu_app().try_get_matches_from(args)?;
@@ -300,29 +327,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
  for date in dates {
  match date {
  Ok(date) => {
- // GNU `date` uses `%N` for nano seconds, however crate::chrono uses `%f`
- let format_string = &format_string.replace("%N", "%f");
- // Refuse to pass this string to chrono as it is crashing in this crate
- if format_string.contains("%#z") {
- return Err(USimpleError::new(
- 1,
- format!("invalid format {}", format_string.replace("%f", "%N")),
- ));
- }
- // Hack to work around panic in chrono,
- // TODO - remove when a fix for https:/chronotope/chrono/issues/623 is released
- let format_items = StrftimeItems::new(format_string);
- if format_items.clone().any(|i| i == Item::Error) {
- return Err(USimpleError::new(
- 1,
- format!("invalid format {}", format_string.replace("%f", "%N")),
- ));
- }
- let formatted = date
- .format_with_items(format_items)
- .to_string()
- .replace("%f", "%N");
- println!("{formatted}");
+ print_date(format_string, date)?;
  }
  Err((input, _err)) => show!(USimpleError::new(
  1,