app-json-settings 2.1.0

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;

#[cfg(all(windows, feature = "uwp"))]
use crate::{ConfigError, Result};

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
        }
    }
}

#[cfg(all(windows, feature = "uwp"))]
pub fn uwp_local_folder_dir() -> Result<PathBuf> {
    use windows::Storage::ApplicationData;

    let application_data = ApplicationData::Current().map_err(platform_error)?;
    let local_folder = application_data.LocalFolder().map_err(platform_error)?;
    let path = local_folder.Path().map_err(platform_error)?;

    Ok(PathBuf::from(path.to_string_lossy()))
}

#[cfg(all(windows, feature = "uwp"))]
fn platform_error(error: windows::core::Error) -> ConfigError {
    ConfigError::Platform(error.message().to_string_lossy())
}

#[cfg(any(target_os = "macos", all(unix, not(target_os = "macos"))))]
pub fn home_dir() -> PathBuf {
    std::env::var_os("HOME")
        .map(PathBuf::from)
        .unwrap_or_else(|| PathBuf::from("."))
}