app-json-settings 2.0.3

App settings as JSON format stored in file and available via read-by-key and write-by-key. Aims a tiny settings manager with reasonably few dependencies.
Documentation 
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use std::path::PathBuf;

/// OS 別 config dir
pub fn default_config_dir() -> PathBuf {
    #[cfg(target_os = "windows")]
    {
        std::env::var_os("APPDATA")
            .map(PathBuf::from)
            .unwrap_or_else(|| PathBuf::from("."))
    }

    #[cfg(target_os = "macos")]
    {
        let mut p = home_dir();
        p.push("Library");
        p.push("Application Support");
        p
    }

    #[cfg(all(unix, not(target_os = "macos")))]
    {
        if let Some(xdg) = std::env::var_os("XDG_CONFIG_HOME") {
            PathBuf::from(xdg)
        } else {
            let mut p = home_dir();
            p.push(".config");
            p
        }
    }
}

/// home dir
pub fn home_dir() -> PathBuf {
    std::env::var_os("HOME")
        .map(PathBuf::from)
        .unwrap_or_else(|| PathBuf::from("."))
}