hnix: Haskell implementation of the Nix language

[ bsd3, data, library, nix, system ] [ Propose Tags ]

Haskell implementation of the Nix language.

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Versions [faq] 0.2.0, 0.2.1, 0.3.2, 0.3.3, 0.3.4, 0.4.0, 0.5.0, 0.5.1, 0.5.2, 0.6.0, 0.6.1, 0.7.0, 0.7.1, 0.8.0, 0.9.0, 0.9.1
Dependencies aeson, ansi-wl-pprint, array (>=0.4 && <0.6), base (>=4.9 && <5), base16-bytestring, binary, bytestring, compact, containers, cryptohash-md5, cryptohash-sha1, cryptohash-sha256, cryptohash-sha512, data-fix, deepseq (>=1.4.2 && <1.5), deriving-compat (>=0.3 && <0.6), directory, exceptions, filepath, ghc-datasize, hashable (>=1.2.4 && <1.3), hashing, haskeline, hnix, http-client, http-client-tls, http-types, interpolate, lens-family (==1.2.1 || >=1.2.2), lens-family-core (==1.2.1 || >=1.2.2), lens-family-th, logict, megaparsec (>=6.5 && <7.0), monadlist, mtl, optparse-applicative, pretty-show, process, regex-tdfa, regex-tdfa-text, repline, scientific, semigroups (==0.18.*), serialise, split, syb, template-haskell, text, these, time, transformers, unix, unordered-containers (>=0.2.9 && <0.3), vector, xml [details]
License BSD-3-Clause
Author John Wiegley
Category System, Data, Nix
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Source repo head: git clone
Uploaded by JohnWiegley at 2018-07-19T22:16:07Z
Distributions NixOS:0.9.0
Executables hnix
Downloads 7488 total (136 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by Bayesian average]
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2018-07-19 [all 1 reports]





Enable all optimization flags


Enable profiling


Enable full debug tracing


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


Maintainer's Corner

For package maintainers and hackage trustees

Readme for hnix-0.5.2

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Build Status Chat <sup>(Hackage Matrix Builder)</sup>

Haskell parser, evaluator and type checker for the Nix language.


Nix is installed and in your $PATH. This is so that nix-store can be used for interacting with store paths, until hnix-store is ready.

Getting Started

$ git clone --recursive
$ cd hnix
$ nix-shell
$ cabal configure --enable-tests
$ cabal build
$ cabal test
# To run all of the tests, which takes up to a minute:
$ env ALL_TESTS=yes cabal test
# To run only specific tests (see `tests/Main.hs` for a list)
$ env NIXPKGS_TESTS=yes PRETTY_TESTS=yes cabal test
$ ./dist/build/hnix/hnix --help

Building a Docker container

If you don't have Nix installed, or you'd just like to play around with hnix completely separately from your main system, you can build a Docker container:

$ docker build -t hnix .
$ docker run hnix hnix --eval --expr '1 + 2'

# In order to refer to files under the current directory:
$ docker run -v $PWD/:/tmp/build run hnix hnix default.nix

Building with full debug info

To build hnix for debugging, and with full tracing output and stack traces, use:

$ nix-shell
$ cabal configure --enable-tests --enable-profiling --flags=profiling --flags=tracing
$ cabal build
$ ./dist/build/hnix/hnix -v5 --trace <args> +RTS -xc

Note that this will run quite slowly, but will give the most information as to what might potentially be going wrong during parsing or evaluation.

Building with benchmarks enabled

To build hnix with benchmarks enabled:

$ nix-shell --arg doBenchmarks true
$ cabal configure --enable-tests --enable-benchmarks
$ cabal build
$ cabal bench

Building with profiling enabled

To build hnix with profiling enabled:

$ nix-shell
$ cabal configure --enable-tests --enable-profiling --flags=profiling
$ cabal build
$ ./dist/build/hnix/hnix <args> +RTS -p

Building with GHCJS

From the project root directory, run:

$ NIX_CONF_DIR=$PWD/ghcjs nix-build ghcjs

This will build an hnix library that can be linked to your GHCJS application.

How you can help

If you're looking for a way to help out, try taking a look here. When you find an issue that looks interesting to you, comment on the ticket to let others know you're working on it; look for others who might have done the same. You can talk with everyone live on Gitter.

When you're ready to submit a pull request, test it with:

git submodule update --init --recursive
nix-shell --run "LANGUAGE_TESTS=yes cabal test"

Make sure that all the tests that were passing prior to your PR are still passing afterwards; it's OK if no new tests are passing.