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Lagg till craten och de schema/runtime-bibliotek som programmet anvander:

[dependencies]
rust-config-tree = "0.2"
confique = { version = "0.4", features = ["yaml", "toml", "json5"] }
figment = { version = "0.10", features = ["yaml", "toml", "json", "env"] }
schemars = { version = "1", features = ["derive"] }
serde = { version = "1", features = ["derive"] }
clap = { version = "4", features = ["derive"] }

Definiera ett confique-schema och implementera ConfigSchema for rottypen:

#![allow(unused)]
fn main() {
use std::path::PathBuf;

use confique::Config;
use rust_config_tree::ConfigSchema;

#[derive(Debug, Config)]
struct AppConfig {
    #[config(default = [])]
    include: Vec<PathBuf>,

    #[config(nested)]
    server: ServerConfig,
}

#[derive(Debug, Config)]
struct ServerConfig {
    #[config(default = "127.0.0.1")]
    #[config(env = "APP_SERVER_BIND")]
    bind: String,

    #[config(default = 8080)]
    #[config(env = "APP_SERVER_PORT")]
    port: u16,
}

impl ConfigSchema for AppConfig {
    fn include_paths(layer: &<Self as Config>::Layer) -> Vec<PathBuf> {
        layer.include.clone().unwrap_or_default()
    }
}
}

Ladda konfigurationen:

#![allow(unused)]
fn main() {
use rust_config_tree::load_config;

let config = load_config::<AppConfig>("config.yaml")?;
println!("{config:#?}");
Ok::<(), Box<dyn std::error::Error + Send + Sync>>(())
}

Anvand en rotfil med rekursiva includes:

# config.yaml
include:
  - config/server.yaml

# config/server.yaml
server:
  bind: 0.0.0.0
  port: 3000

Standardprioriteten for load_config ar:

environment variables
  > config files, with later merged files overriding earlier files
    > confique code defaults

Nar includes laddas av hog-niva-API:t har rotfilen hogsta filprioritet. Inkluderade filer ger lagre prioriterade varden och kan anvandas for standardvarden eller sektionsspecifika filer.

Kommandoradsargument ar programspecifika, sa load_config laser dem inte automatiskt. Slå samman CLI-overrides efter build_config_figment nar programmet har override-flaggor for konfiguration:

CLI-flaggornas namn valjs av programmet. Anvand ConfigOverrides-derive-makrot for att bygga en override-provider fran tolkade CLI-flaggor:

#![allow(unused)]
fn main() {
use clap::Parser;
use rust_config_tree::{
    ConfigSchema,
    cli::ConfigOverrides,
    config::{build_config_figment, load_config_from_figment},
};

#[derive(Debug, Parser, ConfigOverrides)]
struct Cli {
    #[arg(long)]
    config: Option<std::path::PathBuf>,

    #[arg(long)]
    #[config_override(path = "server.port")]
    server_port: Option<u16>,

    #[arg(long)]
    #[config_override(path = "log.level")]
    log_level: Option<String>,
}

let cli = Cli::parse();
let figment = build_config_figment::<AppConfig>("config.yaml")?
    .merge(cli.config_overrides()?);
let config = load_config_from_figment::<AppConfig>(&figment)?;
let _ = config;
Ok::<(), Box<dyn std::error::Error + Send + Sync>>(())
}

Attributet #[config_override(path = "...")] mappar varje CLI-flagga till en punktseparerad konfigurationssokvag. Endast angivna flaggor producerar override-varden; utelamnade flaggor forsvinner. Override-providern slås samman sist, sa angivna flaggor overskriver fil- och miljovariabelvarden:

command-line overrides
  > environment variables
    > config files
      > confique code defaults