#config #configuration #settings #clap #rust-ini


Combine clap and rust-ini into a single procedural macro

9 unstable releases

0.5.0 Jan 4, 2022
0.4.0 Sep 14, 2020
0.3.2 Jul 13, 2020
0.2.0 Jul 12, 2020
0.1.3 Jul 10, 2020

#41 in Configuration

41 downloads per month

MIT license

99 lines


Combine argument parsing with a config file at compile time.

Build Status docs.rs version

StructConf is a small derive macro that allows you to combine argument parsing from clap and config file parsing from rust-ini at compile time. It's inspired by the argument parser structopt.

StructConf aims to be relatively small and simple. Here are its current selling points:

  • Options available in the config file, argument parser, both, or none.
  • Configurable option names.
  • Custom types supported.
  • Optional fields with Option.
  • Custom default expressions.
  • Insightful error messages.
  • Thoroughly tested.

Small example:

use structconf::{clap, StructConf};

#[derive(Debug, StructConf)]
struct ServerConfig {
    #[conf(help = "The public key")]
    pub public_key: String,
    #[conf(no_file, long = "your-secret", help = "Your secret API key")]
    pub secret_key: String,
    #[conf(default = "100", help = "timeout in seconds")]
    pub timeout: i32,

pub fn main() {
    let app = clap::App::new("demo");
    let conf = ServerConfig::parse(app, "config.ini");
    println!("Parsed config: {:#?}", conf);

For more details on how to use Structconf, read the docs and check out the examples.


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