tvl-depot/tvix/serde/examples/nixpkgs.rs

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//! This program demonstrates deserialising some configuration
//! structure from Nix code that makes use of nixpkgs.lib
//!
//! This example does not add the full set of Nix features (i.e.
//! builds & derivations).
use serde::Deserialize;
#[derive(Debug, Deserialize)]
struct Config {
host: String,
port: usize,
}
fn main() {
let code = r#"
let
lib = import <nixpkgs/lib>;
host = lib.strings.concatStringsSep "." ["foo" "example" "com"];
in {
inherit host;
port = 4242;
}
"#;
let result = tvix_serde::from_str_with_config::<Config, _>(code, |eval_builder| {
eval_builder.enable_impure(None)
});
match result {
Ok(cfg) => println!("Config says: {}:{}", cfg.host, cfg.port),
Err(e) => eprintln!("{:?} / {}", e, e),
}
}