Configuration management with layered providers.

This crate provides a flexible configuration system supporting multiple sources with layered precedence.

cruxi-config

Layered configuration providers with typed access helpers.

Purpose

cruxi-config standardizes config lookup via ConfigProvider, with built-in providers:

• EnvProvider: environment variables (optional prefix)
• MapProvider: in-memory values
• LayeredProvider: precedence-ordered composition

Usage

Build a layered stack where earlier providers override later ones.

Example

use cruxi_config::{ConfigProvider, EnvProvider, LayeredProvider, MapProvider};

let mut defaults = MapProvider::new();
defaults.set("PORT", "8080");

let cfg = LayeredProvider::new()
    .add(EnvProvider::with_prefix("APP"))
    .add(defaults);

let port = cfg.get_or("PORT", "3000");
assert!(!port.is_empty());