lum_config 0.2.3

lum framework's config library
Documentation 
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use std::io;

use lum_libs::{serde_env, serde_json};
use thiserror::Error;

/// Error that can occur when trying to get the OS-specific config directory.
#[derive(Debug, Error)]
pub enum ConfigPathError {
    #[error("Unable to get OS-specific config directory")]
    UnknownConfigDirectory,
}

/// Error that can occur when trying to save a configuration to a file.
#[derive(Debug, Error)]
pub enum ConfigSaveError {
    #[error("Unable to serialize config: {0}")]
    Serde(#[from] serde_json::Error),

    #[error("I/O error: {0}")]
    IO(#[from] io::Error),
}

/// Error that can occur when trying to parse a configuration from a file.
#[derive(Debug, Error)]
pub enum FileConfigParseError {
    #[error("Unable to save config: {0}")]
    Save(#[from] ConfigSaveError),

    #[error("I/O error: {0}")]
    IO(#[from] io::Error),

    #[error("Unable to serialize or deserialize config: {0}")]
    Serde(#[from] serde_json::Error),
}

/// Error that can occur when trying to parse a configuration from environment variables.
#[derive(Debug, Error)]
pub enum EnvironmentConfigParseError {
    #[error("Unable to parse environment variables: {0}")]
    SerdeEnv(#[from] serde_env::Error),
}

/// Error that can occur when trying to load a configuration.
#[derive(Debug, Error)]
pub enum ConfigLoadError {
    #[error("Unable to handle config path: {0}")]
    Path(#[from] ConfigPathError),

    #[error("Unable to parse environment config: {0}")]
    ParseEnv(#[from] EnvironmentConfigParseError),

    #[error("Unable to parse file config: {0}")]
    ParseFile(#[from] FileConfigParseError),
}