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use core::fmt;

/// Trait for custom formatting
pub trait CustomFormat {
    fn fmt(&self, f: &mut fmt::Formatter, spec: &str) -> fmt::Result;
}

/// Wrapper for custom formatting via its [`Display`](core::fmt::Display) trait
#[derive(Debug, Clone)]
pub struct CustomFormatter<'a, T> {
    /// Format specifier
    spec: &'static str,
    /// Value to format
    value: &'a T,
}

impl<'a, T> CustomFormatter<'a, T> {
    /// Construct a new [`CustomFormatter`] value
    pub fn new(spec: &'static str, value: &'a T) -> Self {
        Self { spec, value }
    }
}

impl<T: CustomFormat> fmt::Display for CustomFormatter<'_, T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        CustomFormat::fmt(self.value, f, self.spec)
    }
}

pub use custom_format_macros::runtime_eprint as eprint;
pub use custom_format_macros::runtime_eprintln as eprintln;
pub use custom_format_macros::runtime_format as format;
pub use custom_format_macros::runtime_format_args as format_args;
pub use custom_format_macros::runtime_panic as panic;
pub use custom_format_macros::runtime_print as print;
pub use custom_format_macros::runtime_println as println;
pub use custom_format_macros::runtime_write as write;
pub use custom_format_macros::runtime_writeln as writeln;