tvl-depot/tvix/eval
sterni 64bb501de1 fix(tvix): distinguish search- and relative path resolution errors
Failures to resolve a nix search path lookup in angle brackets can be
caught using tryEval (if it reaches the runtime). Resolving relative
paths (either to the current directory or the current user's home) can
never be caught, even if they happen inside a thunk at runtime (which is
currently the case for home-relative paths).

Change-Id: I7f73221df66d82a381dd4063358906257826995a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7025
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: Adam Joseph <adam@westernsemico.com>
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
2022-10-21 00:11:29 +00:00
..
benches refactor(tvix/eval): use Clap for arg+env parsing 2022-09-18 22:08:43 +00:00
docs fix(tvix/eval): bring foldl' strictness in line with C++ Nix 2022-10-15 14:12:23 +00:00
proptest-regressions/value test(tvix/eval): Add tests for the Eq laws of Value 2022-09-18 17:57:09 +00:00
src fix(tvix): distinguish search- and relative path resolution errors 2022-10-21 00:11:29 +00:00
tests feat(tvix/eval): Allow adding strings to paths 2022-10-10 20:23:41 +00:00
.envrc chore(tvix/eval): add simple .envrc / shell.nix 2022-09-17 17:31:08 +00:00
.gitignore feat(tvix/eval): check in generated project skeleton 2022-08-12 12:34:29 +00:00
.skip-subtree feat(tvix/tests): check in Nix' language test suite 2022-08-24 21:25:41 +00:00
Cargo.lock feat(tvix/eval): add an AST pretty-printing module 2022-10-16 12:26:56 +00:00
Cargo.toml test(tvix/eval): enable nix_tests by default 2022-10-20 02:28:38 +00:00
default.nix test(tvix): nix-planned test verification using C++ Nix 2.3 and 2.11 2022-10-20 02:28:38 +00:00
README.md docs(tvix/eval): explain where to find the site-specific mg tool 2022-10-13 18:41:02 +00:00
shell.nix chore(tvix/eval): add rustfmt to the shell 2022-09-18 23:19:54 +00:00

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 the evaluator

If you are in a full checkout of the TVL depot, you can simply run mg build in this directory (or mg build //tvix/eval from anywhere in the repo). The mg command is found in /tools/magrathea.

Important note: We only use and test Nix builds of our software against Nix 2.3. There are a variety of bugs and subtle problems in newer Nix versions which we do not have the bandwidth to address, builds in newer Nix versions may or may not work.

The evaluator 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.