History

sterni 2aab01ac29 fix(tvix/eval): thunk HasAttr expressions HasAttrs was weird because with longer attribute paths it would sometimes not turn out to be a thunk. If it was a thunk, it'd usually still do some eval strictly which we'll want to avoid. Verified against C++ Nix using a new test suite introduced in a later CL. Change-Id: I6d047ccc68d046bb268462f170a3c4f3c5ddeffe Reviewed-on: https://cl.tvl.fyi/c/depot/+/8656 Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>		2023-05-29 12:44:09 +00:00
..
benches	fix(tvix/eval): fix current clippy warnings	2022-12-25 18:25:06 +00:00
builtin-macros	refactor(tvix/eval): flatten call stack of VM using generators	2023-03-13 20:30:59 +00:00
docs	docs(tvix/eval): suggested layout adjustment to VM loop diagram	2023-03-14 09:56:28 +00:00
proptest-regressions/value	refactor(tvix/eval): flatten call stack of VM using generators	2023-03-13 20:30:59 +00:00
src	fix(tvix/eval): thunk HasAttr expressions	2023-05-29 12:44:09 +00:00
tests	feat(tvix/eval): add Evaluation::strict to toggle top-level deepseq	2023-03-22 13:44:20 +00:00
.skip-subtree	feat(tvix/tests): check in Nix' language test suite	2022-08-24 21:25:41 +00:00
build.rs	feat(tvix/eval): implement builtins.currentSystem	2022-10-24 12:20:01 +00:00
Cargo.toml	chore(tvix/*): bump to smol_str 0.2.0	2023-05-11 18:19:20 +00:00
default.nix	refactor(tvix): build Rust projects using crate2nix	2022-12-15 17:26:45 +00:00
README.md	docs(tvix): move most of //tvix/eval README up to //tvix	2023-01-21 15:08:38 +00:00

README.md

Tvix Evaluator

This project implements an interpreter for the Nix programming language. You can experiment with an online version of the evaluator: tvixbolt.

The interpreter aims to be compatible with nixpkgs, on the foundation of Nix 2.3.

Important note: The evaluator is not yet feature-complete, and while the core mechanisms (compiler, runtime, ...) have stabilised somewhat, a lot of components are still changing rapidly.

Please contact TVL with any questions you might have.

Building tvix-eval

Please check the README.md one level up for instructions on how to build this.

The evaluator itself can also be built with standard Rust tooling (i.e. cargo build).

If you would like to clone only the evaluator and build it directly with Rust tooling, you can do:

git clone https://code.tvl.fyi/depot.git:/tvix/eval.git tvix-eval

cd tvix-eval && cargo build

Nix test suite

C++ Nix implements a language test suite in the form of Nix source code files, and their expected output. The coverage of this test suite is not complete, but we intend to be compatible with it.

We have ported the test suite to Tvix, but do not run it by default as we are not yet compatible with it.

You can run the test suite by enabling the nix_tests feature in Cargo:

cargo test --features nix_tests

rnix-parser

Tvix is written in memory of jD91mZM2, the author of rnix-parser who sadly passed away.

Tvix makes heavy use of rnix-parser in its bytecode compiler. The parser is now maintained by Nix community members.