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/// An error generated by user input
#[derive(Debug, serde::Serialize)]
#[serde(rename_all = "snake_case")]
pub enum UserError {
    /// Cannot look up the crate    
    CannotLookup {
        /// Name of the crate
        name: String,
        /// Version of the crate
        version: Option<String>,
        /// Error display
        error: String,
    },
    /// No versions found for the crate    
    NoVersions {
        /// Name of the crate
        name: String,
    },
    /// An invalid version was specified for the crate    
    InvalidVersion {
        /// Name of the crate
        name: String,
        /// Version of the crate
        version: String,
    },
}

/// An error generated internally (not caused by the user).
#[derive(Debug, thiserror::Error)]
pub enum InternalError {
    /// Failed to de/serialize some json
    #[error("json deserialization error: {0}")]
    Json(#[from] serde_json::Error),
    /// Failed to do an HTTP request
    #[error("http get error: {0}")]
    Http(#[from] attohttpc::Error),
}