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# rule_haskell examples
Examples of using [rules_haskell][rules_haskell], the Bazel rule set
for building Haskell code.
* [**vector:**](./vector/) shows how to build the `vector` package as
found on Hackage, using a Nix provided compiler toolchain.
* [**rts:**](./rts/) demonstrates foreign exports and shows how to
link against GHC's RTS library, i.e. `libHSrts.so`.
## **Important**
Run all commands from the root of `rules_haskell`.
If you `cd examples/`, bazel *will* [break on
you](https://github.com/tweag/rules_haskell/issues/740).
This is a current problem with bazel workspaces.
## Root Workspace
Build everything in the root workspace with;
```
$ bazel build @io_tweag_rules_haskell_examples//...
```
Show every target of the vector example;
```
$ bazel query @io_tweag_rules_haskell_examples//vector/...
@io_tweag_rules_haskell_examples//vector:vector
@io_tweag_rules_haskell_examples//vector:semigroups
@io_tweag_rules_haskell_examples//vector:primitive
@io_tweag_rules_haskell_examples//vector:ghc-prim
@io_tweag_rules_haskell_examples//vector:deepseq
@io_tweag_rules_haskell_examples//vector:base
```
Build the two main Haskell targets;
```
$ bazel build @io_tweag_rules_haskell_examples//vector
$ bazel build @io_tweag_rules_haskell_examples//rts:add-one-hs
```
[rules_haskell]: https://github.com/tweag/rules_haskell
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