Function separated

src/ore/src/str.rs:193–224

Creates a type whose [`fmt::Display`] implementation outputs each item in `iter` separated by `separator`.

(separator: &'a str, iter: I)

/// Creates a type whose [`fmt::Display`] implementation outputs each item in
/// `iter` separated by `separator`.
pub fn separated<'a, I>(separator: &'a str, iter: I) -> impl fmt::Display + 'a
where
    I: IntoIterator,
    I::IntoIter: Clone + 'a,
    I::Item: fmt::Display + 'a,
{
    struct Separated<'a, I> {
        separator: &'a str,
        iter: I,
    }

    impl<'a, I> fmt::Display for Separated<'a, I>
    where
        I: Iterator + Clone,
        I::Item: fmt::Display,
    {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            for (i, item) in self.iter.clone().enumerate() {
                if i != 0 {
                    write!(f, "{}", self.separator)?;
                }
                write!(f, "{}", item)?;
            }
            Ok(())
        }
    }

    Separated {
        separator,
        iter: iter.into_iter(),
    }
}

/// A helper struct to keep track of indentation levels.
///