diff options
author | Vincent Ambo <tazjin@tvl.su> | 2024-02-20T11·32+0700 |
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committer | clbot <clbot@tvl.fyi> | 2024-02-20T12·13+0000 |
commit | d0d1027a853882f8bb44ac26c865f04bfa42ed70 (patch) | |
tree | 9bc1b80f88c4e43c7a0f2c638a7d594c83c00644 /tvix | |
parent | e839116e5c583a82d145e5dca336964e6569d487 (diff) |
feat(tvix/serde): add an example using nixpkgs/lib r/7575
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>
Diffstat (limited to '')
-rw-r--r-- | tvix/serde/examples/nixpkgs.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tvix/serde/examples/nixpkgs.rs b/tvix/serde/examples/nixpkgs.rs new file mode 100644 index 000000000000..ad8c4160b5d0 --- /dev/null +++ b/tvix/serde/examples/nixpkgs.rs @@ -0,0 +1,34 @@ +//! 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| { + eval.enable_impure(None); + }); + + match result { + Ok(cfg) => println!("Config says: {}:{}", cfg.host, cfg.port), + Err(e) => eprintln!("{:?} / {}", e, e), + } +} |