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use std::error::Error; use std::fmt::{self, Debug, Display, Formatter}; #[derive(Debug, PartialEq)] pub enum LyricsError { ParseError(String), IDTagError(IDTagErrorKind), FormatError(&'static str), } impl Display for LyricsError { #[inline] fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> { match self { LyricsError::ParseError(s) => f.write_str(s), LyricsError::IDTagError(k) => f.write_fmt(format_args!("Set a wrong {}.", k)), LyricsError::FormatError(s) => f.write_str(s), } } } impl Error for LyricsError {} #[derive(Debug, Copy, Clone, PartialEq)] pub enum IDTagErrorKind { Label, Text, } impl Display for IDTagErrorKind { #[inline] fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> { match self { IDTagErrorKind::Label => f.write_str("label"), IDTagErrorKind::Text => f.write_str("text"), } } } impl Error for IDTagErrorKind {}