d0d1027a85
This displays how users can configure an impure evaluation for tvix-serde, which makes it possible to use e.g. `nixpkgs/lib`. We might want to add an example showing how the full Nix-glue compatibility stuff can be added here, too. Change-Id: I2224a3fc66e739969d4c723c3d9d8127a046b6fd Reviewed-on: https://cl.tvl.fyi/c/depot/+/10994 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su>
34 lines
803 B
Rust
34 lines
803 B
Rust
//! This program demonstrates deserialising some configuration
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//! structure from Nix code that makes use of nixpkgs.lib
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//!
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//! This example does not add the full set of Nix features (i.e.
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//! builds & derivations).
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use serde::Deserialize;
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#[derive(Debug, Deserialize)]
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struct Config {
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host: String,
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port: usize,
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}
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fn main() {
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let code = r#"
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let
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lib = import <nixpkgs/lib>;
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host = lib.strings.concatStringsSep "." ["foo" "example" "com"];
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in {
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inherit host;
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port = 4242;
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}
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"#;
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let result = tvix_serde::from_str_with_config::<Config, _>(code, |eval| {
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eval.enable_impure(None);
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});
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match result {
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Ok(cfg) => println!("Config says: {}:{}", cfg.host, cfg.port),
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Err(e) => eprintln!("{:?} / {}", e, e),
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}
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}
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