2016-02-08 00:53:22 +01:00
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# hnix
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2018-04-24 06:48:19 +02:00
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[![Build Status](https://api.travis-ci.org/haskell-nix/hnix.svg)](https://travis-ci.org/haskell-nix/hnix)
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2018-05-03 20:42:57 +02:00
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[![Chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/haskell-nix/Lobby)
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2018-05-11 00:25:58 +02:00
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<sup>([Hackage Matrix Builder](https://matrix.hackage.haskell.org/package/hnix))</sup>
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2018-04-24 06:48:19 +02:00
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2018-04-03 09:33:30 +02:00
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Haskell parser, evaluator and type checker for the Nix language.
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2016-02-08 00:53:22 +01:00
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## Prerequisites
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2018-04-05 00:05:58 +02:00
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Nix is installed and in your `$PATH`. This is so that `nix-store` can be used
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for interacting with store paths, until `hnix-store` is ready.
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2016-02-08 00:53:22 +01:00
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## Getting Started
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```bash
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2018-04-24 06:48:19 +02:00
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$ git clone --recursive https://github.com/haskell-nix/hnix.git
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2016-02-08 00:53:22 +01:00
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...
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$ cd hnix
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$ nix-shell
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2018-04-17 07:24:06 +02:00
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$ cabal configure --enable-tests
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$ cabal build
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$ cabal test
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2018-04-12 19:28:16 +02:00
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# To run all of the tests, which takes up to a minute:
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2018-05-14 23:47:58 +02:00
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$ env ALL_TESTS=yes cabal test
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# To run only specific tests (see `tests/Main.hs` for a list)
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2019-03-09 21:53:07 +01:00
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$ env NIXPKGS_TESTS=yes PRETTY_TESTS=1 cabal test
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2018-04-03 09:33:30 +02:00
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$ ./dist/build/hnix/hnix --help
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2016-02-08 00:53:22 +01:00
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```
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2018-05-07 21:45:37 +02:00
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## Building a Docker container
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If you don't have Nix installed, or you'd just like to play around with `hnix`
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completely separately from your main system, you can build a Docker container:
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```bash
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$ docker build -t hnix .
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$ docker run hnix hnix --eval --expr '1 + 2'
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# In order to refer to files under the current directory:
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$ docker run -v $PWD/:/tmp/build run hnix hnix default.nix
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```
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2018-04-19 01:28:21 +02:00
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## Building with full debug info
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To build `hnix` for debugging, and with full tracing output and stack traces,
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use:
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```
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2018-05-30 21:10:31 +02:00
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$ nix-shell
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$ cabal configure --enable-tests --enable-profiling --flags=profiling --flags=tracing
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2018-04-19 01:28:21 +02:00
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$ cabal build
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2018-05-07 21:45:37 +02:00
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$ ./dist/build/hnix/hnix -v5 --trace <args> +RTS -xc
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2018-04-19 01:28:21 +02:00
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```
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Note that this will run quite slowly, but will give the most information as to
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what might potentially be going wrong during parsing or evaluation.
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2018-04-13 09:06:45 +02:00
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## Building with benchmarks enabled
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To build `hnix` with benchmarks enabled:
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```
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$ nix-shell --arg doBenchmarks true
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2018-04-17 07:24:06 +02:00
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$ cabal configure --enable-tests --enable-benchmarks
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$ cabal build
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$ cabal bench
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2018-04-13 09:06:45 +02:00
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```
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2018-04-10 20:49:18 +02:00
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## Building with profiling enabled
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To build `hnix` with profiling enabled:
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```
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2018-05-30 21:10:31 +02:00
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$ nix-shell
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$ cabal configure --enable-tests --enable-profiling --flags=profiling
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2018-04-17 07:24:06 +02:00
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$ cabal build
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2018-04-10 20:49:18 +02:00
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$ ./dist/build/hnix/hnix <args> +RTS -p
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```
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2018-05-13 23:17:55 +02:00
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## Building with GHCJS
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From the project root directory, run:
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```
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$ NIX_CONF_DIR=$PWD/ghcjs nix-build ghcjs
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```
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This will build an `hnix` library that can be linked to your GHCJS
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application.
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2018-07-25 19:38:11 +02:00
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## Using the Cachix binary cache
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If you're on macOS, you can use the binary cache at Cachix to avoid building
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2018-07-25 20:52:59 +02:00
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the specific dependencies used by hnix. Just use these commands:
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2018-07-25 19:38:11 +02:00
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2018-07-25 20:52:59 +02:00
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nix-env -iA cachix -f https://github.com/NixOS/nixpkgs/tarball/db557aab7b690f5e0e3348459f2e4dc8fd0d9298
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cachix use hnix
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2018-07-25 19:38:11 +02:00
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2018-04-04 07:57:23 +02:00
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## How you can help
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2018-11-18 17:44:52 +01:00
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### Issue Tracker Backlog
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2018-04-13 06:20:23 +02:00
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If you're looking for a way to help out, try taking a look
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2018-04-24 06:48:19 +02:00
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[here](https://github.com/haskell-nix/hnix/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22+no%3Aassignee).
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2018-04-13 06:20:23 +02:00
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When you find an issue that looks interesting to you, comment on the ticket to
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let others know you're working on it; look for others who might have done the
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same. You can talk with everyone live on
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2018-05-03 20:41:49 +02:00
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[Gitter](https://gitter.im/haskell-nix/Lobby).
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2018-04-04 07:57:23 +02:00
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When you're ready to submit a pull request, test it with:
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```
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2018-04-04 08:46:32 +02:00
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git submodule update --init --recursive
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2018-04-17 07:24:06 +02:00
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nix-shell --run "LANGUAGE_TESTS=yes cabal test"
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2018-04-04 07:57:23 +02:00
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```
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2018-04-13 06:20:23 +02:00
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Make sure that all the tests that were passing prior to your PR are still
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passing afterwards; it's OK if no new tests are passing.
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2018-11-18 17:44:52 +01:00
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### Evaluating Nixpkgs with HNix
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Currently the main high-level goal is to be able to evaluate all of nixpkgs. To
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run this yourself, first build hnix with `nix-build`, then run the following
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command:
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```
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./result/bin/hnix --eval -E "import <nixpkgs> {}" --find
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```
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