Expand description
The conditional configuration loader for Rust applications that use the config crate.
use std::path::Path;
use config_load::config::builder::DefaultState;
use config_load::config::{ConfigBuilder, Environment};
use config_load::{ConfigLoader, FileLocation, Load};
use serde::{Deserialize, Serialize};
#[derive(Debug, Default, Deserialize, Serialize)]
#[serde(default)]
struct AppConfig {
enabled: bool,
title: String,
attempts: u32,
}
impl Load for AppConfig {
fn load(config_builder: ConfigBuilder<DefaultState>) -> config_load::Result<Self> {
let config = config_builder
.add_source(Environment::with_prefix("APP").separator("_"))
.build()?;
config.try_deserialize()
}
}
let config_file = None; // Parsed from command line arguments, for example
let config: AppConfig = ConfigLoader::default()
.add(
FileLocation::first_some_path()
.from_env("APP_ROOT_CONFIG")
.from_home(Path::new(".example_app").join("AppConfig.toml")),
)
.exclude_not_exists() // Exclude file pathes that don't exist, especially when APP_ROOT_CONFIG is set to ""
.add(
FileLocation::first_some_path()
.from_file(config_file)
.from_cwd_and_parents_exists("AppConfig.toml"),
)
.load()
.expect("Failed to load config");Re-exports§
pub use crate::load::Load;pub use crate::location::Location;pub use crate::location::file::FileLocation;pub use config;