mmkv 0.8.1

Rust version of MMKV
Documentation 
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use std::fmt::{Debug, Display, Formatter};

pub mod logger;

/**
See [MMKV::set_logger](crate::MMKV::set_logger)

Logger should be [`Send`], because it will be moved into io thread
 */
pub trait Logger: Debug + Send + Sync {
    fn verbose(&self, log_str: String);
    fn info(&self, log_str: String);
    fn debug(&self, log_str: String);
    fn warn(&self, log_str: String);
    fn error(&self, log_str: String);
}

#[derive(Copy, Clone)]
pub enum LogLevel {
    Off,
    Error,
    Warn,
    Info,
    Debug,
    Verbose,
}

impl TryFrom<i32> for LogLevel {
    type Error = ();

    fn try_from(v: i32) -> Result<Self, <LogLevel as TryFrom<i32>>::Error> {
        match v {
            v if v == LogLevel::Off as i32 => Ok(LogLevel::Off),
            v if v == LogLevel::Error as i32 => Ok(LogLevel::Error),
            v if v == LogLevel::Warn as i32 => Ok(LogLevel::Warn),
            v if v == LogLevel::Info as i32 => Ok(LogLevel::Info),
            v if v == LogLevel::Debug as i32 => Ok(LogLevel::Debug),
            v if v == LogLevel::Verbose as i32 => Ok(LogLevel::Verbose),
            _ => Err(()),
        }
    }
}

impl Display for LogLevel {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            LogLevel::Off => write!(f, ""),
            LogLevel::Error => write!(f, "E"),
            LogLevel::Warn => write!(f, "W"),
            LogLevel::Info => write!(f, "I"),
            LogLevel::Debug => write!(f, "D"),
            LogLevel::Verbose => write!(f, "V"),
        }
    }
}