iowo/crates/app/src/config.rs

use clap::Parser;

use self::{
    cli::Args,
    config_file::{find_config_file, Configs},
    error::ConfigError,
};

mod cli;
mod config_file;

/// this struct may hold all configuration
pub struct Config {
    pub startup_msg: bool,
}

impl Config {
    pub fn read() -> Result<Self, ConfigError> {
        let args = Args::parse();
        let config_path = if let Some(config_path) = args.config_path {
            config_path
        } else {
            find_config_file()?
        };
        let file_config = Configs::read(config_path)?;

        Ok(Self {
            // this is negated because to an outward api, the negative is more intuitive,
            // while in the source the other way around is more intuitive
            startup_msg: !(args.no_startup_message || file_config.no_startup_message),
        })
    }
}

pub mod error {
    #[derive(Debug)]
    pub enum ConfigError {
        NoConfigDir,
        NoConfigFileFound,
        IoError(std::io::Error),
        UnknownExtension(Option<String>),
        SerdeJsonError(serde_json::Error),
        SerdeRonError(ron::error::SpannedError),
    }

    impl From<std::io::Error> for ConfigError {
        fn from(value: std::io::Error) -> Self {
            Self::IoError(value)
        }
    }

    impl From<serde_json::Error> for ConfigError {
        fn from(value: serde_json::Error) -> Self {
            Self::SerdeJsonError(value)
        }
    }

    impl From<ron::error::SpannedError> for ConfigError {
        fn from(value: ron::error::SpannedError) -> Self {
            Self::SerdeRonError(value)
        }
    }
}