tvl-depot/tvix/serde/examples/cfg-demo.rs

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//! This program demonstrates how to use tvix_serde to deserialise
//! program configuration (or other data) from Nix code.
//!
//! This makes it possible to use Nix as an embedded config language.
//! For greater control over evaluation, and for features like adding
//! additional builtins, depending directly on tvix_eval would be
//! required.
use serde::Deserialize;
use std::collections::HashMap;
#[derive(Debug, Deserialize)]
enum Flavour {
Tasty,
Okay,
Eww,
}
#[allow(dead_code)]
#[derive(Debug, Deserialize)]
struct Data {
name: String,
foods: HashMap<String, Flavour>,
}
fn main() {
// Get the content from wherever, read it from a file, receive it
// over the network - whatever floats your boat! We'll include it
// as a string.
let code = include_str!("foods.nix");
// Now you can use tvix_serde to deserialise the struct:
let foods: Data = tvix_serde::from_str(code).expect("deserialisation should succeed");
println!("These are the foods:\n{:#?}", foods);
}