tegdb 0.5.0

The name TegridyDB (short for TegDB) is inspired by the Tegridy Farm in South Park and tries to correct some of the wrong database implementations, such as null support, implicit conversion support, etc.
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use std::fmt;

#[derive(Debug)]
pub enum Error {
    Io(std::io::Error),
    S3(String),
    Parse(String),
    InvalidState(String),
    Config(String),
    Restore(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Error::Io(e) => write!(f, "I/O error: {}", e),
            Error::S3(e) => write!(f, "S3 error: {}", e),
            Error::Parse(e) => write!(f, "Parse error: {}", e),
            Error::InvalidState(e) => write!(f, "Invalid state: {}", e),
            Error::Config(e) => write!(f, "Config error: {}", e),
            Error::Restore(e) => write!(f, "Restore error: {}", e),
        }
    }
}

impl std::error::Error for Error {}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Self {
        Error::Io(e)
    }
}

impl From<serde_json::Error> for Error {
    fn from(e: serde_json::Error) -> Self {
        Error::Parse(format!("JSON error: {}", e))
    }
}

pub type Result<T> = std::result::Result<T, Error>;