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    use std::fmt;

    use crate::{transform, uppercase};

    /// This trait defines a shouty kebab case conversion.
    ///
    /// In SHOUTY-KEBAB-CASE, word boundaries are indicated by hyphens and all
    /// words are in uppercase.
    ///
    /// ## Example:
    ///
    /// ```rust
    /// use heck::ToShoutyKebabCase;
    ///
    /// let sentence = "We are going to inherit the earth.";
    /// assert_eq!(sentence.to_shouty_kebab_case(), "WE-ARE-GOING-TO-INHERIT-THE-EARTH");
    /// ```
    pub trait ToShoutyKebabCase: ToOwned {
        /// Convert this type to shouty kebab case.
        fn to_shouty_kebab_case(&self) -> Self::Owned;
    }

    impl ToShoutyKebabCase for str {
        fn to_shouty_kebab_case(&self) -> Self::Owned {
            AsShoutyKebabCase(self).to_string()
        }
    }

    /// This wrapper performs a kebab case conversion in [`fmt::Display`].
    ///
    /// ## Example:
    ///
    /// ```
    /// use heck::AsShoutyKebabCase;
    ///
    /// let sentence = "We are going to inherit the earth.";
    /// assert_eq!(format!("{}", AsShoutyKebabCase(sentence)), "WE-ARE-GOING-TO-INHERIT-THE-EARTH");
    /// ```
    pub struct AsShoutyKebabCase<T: AsRef<str>>(pub T);

    impl<T: AsRef<str>> fmt::Display for AsShoutyKebabCase<T> {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            transform(self.0.as_ref(), uppercase, |f| write!(f, "-"), f)
        }
    }

    #[cfg(test)]
    mod tests {
        use super::ToShoutyKebabCase;

        macro_rules! t {
            ($t:ident : $s1:expr => $s2:expr) => {
                #[test]
                fn $t() {
                    assert_eq!($s1.to_shouty_kebab_case(), $s2)
                }
            };
        }

        t!(test1: "CamelCase" => "CAMEL-CASE");
        t!(test2: "This is Human case." => "THIS-IS-HUMAN-CASE");
        t!(test3: "MixedUP CamelCase, with some Spaces" => "MIXED-UP-CAMEL-CASE-WITH-SOME-SPACES");
        t!(test4: "mixed_up_ snake_case with some _spaces" => "MIXED-UP-SNAKE-CASE-WITH-SOME-SPACES");
        t!(test5: "kebab-case" => "KEBAB-CASE");
        t!(test6: "SHOUTY_SNAKE_CASE" => "SHOUTY-SNAKE-CASE");
        t!(test7: "snake_case" => "SNAKE-CASE");
        t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "THIS-CONTAINS-ALL-KINDS-OF-WORD-BOUNDARIES");
        #[cfg(feature = "unicode")]
        t!(test9: "XΣXΣ baﬄe" => "XΣXΣ-BAFFLE");
        t!(test10: "XMLHttpRequest" => "XML-HTTP-REQUEST");
        t!(test11: "SHOUTY-KEBAB-CASE" => "SHOUTY-KEBAB-CASE");
    }