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These are some suggested changes to the new documentation of Haskell in
the Nixpkgs manual. They cover sections until, but excluding, the
section "Available package versions". I am not an English native
speaker, so please correct me and savage these changes!

Also, please let me know if the suggestions are welcome, then I will
continue with the next chapter.
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Dominik Schrempf 2023-01-17 14:46:00 +01:00
parent 11d29ac93d
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38
doc/languages-frameworks/haskell.section.md
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@ -1,13 +1,13 @@
# Haskell {#haskell} # Haskell {#haskell}
The Haskell infrastructure in nixpkgs has two main purposes: The primary purpose The Haskell infrastructure in Nixpkgs has two main purposes: The primary purpose
is to provide a Haskell compiler and build tools as well as infrastructure for is to provide a Haskell compiler and build tools as well as infrastructure for
packaging Haskell-based packages. packaging Haskell-based packages.
The secondary purpose is to provide support for Haskell development environment The secondary purpose is to provide support for Haskell development environments
including prebuilt Haskell libraries. However, in this area sacrifices have been including prebuilt Haskell libraries. However, in this area sacrifices have been
made due to self-imposed restrictions in nixpkgs, to lessen the maintenance made due to self-imposed restrictions in Nixpkgs, to lessen the maintenance
effort and improve performance. (More details in the subsection effort and to improve performance. (More details in the subsection
[Limitations.](#haskell-limitations)) [Limitations.](#haskell-limitations))
## Available packages {#haskell-available-packages} ## Available packages {#haskell-available-packages}
@ -18,17 +18,17 @@ The compiler and most build tools are exposed at the top level:
* Language specific tools: `cabal-install`, `stack`, `hpack`, … * Language specific tools: `cabal-install`, `stack`, `hpack`, …
Many “normal” user facing packages written in Haskell, like `niv` or `cachix`, Many “normal” user facing packages written in Haskell, like `niv` or `cachix`,
are also exposed at the top level, so there is nothing haskell specific to are also exposed at the top level, and there is nothing Haskell specific to
installing and using them. installing and using them.
All of these packages originally are defined in the `haskellPackages` package All of these packages are originally defined in the `haskellPackages` package
set and are re-exposed with a reduced dependency closure for convenience. set and are re-exposed with a reduced dependency closure for convenience.
(see `justStaticExecutables` below) (see `justStaticExecutables` below)
The `haskellPackages` set includes at least one version of every package from The `haskellPackages` set includes at least one version of every package from
Hackage as well as some manually injected packages. This amounts to a lot of Hackage as well as some manually injected packages. This amounts to a lot of
packages, so it is hidden from `nix-env -qa` by default for performance reasons. packages, so it is hidden from `nix-env -qa` by default for performance reasons.
You can still list all packages in the set like this, though: You can still list all packages in the set like this:
```console ```console
$ nix-env -f '<nixpkgs>' -qaP -A haskellPackages $ nix-env -f '<nixpkgs>' -qaP -A haskellPackages
@ -39,22 +39,22 @@ haskellPackages.abacate abac
haskellPackages.abc-puzzle abc-puzzle-0.2.1 haskellPackages.abc-puzzle abc-puzzle-0.2.1
… …
``` ```
Also the default set `haskellPackages` is included on [search.nixos.org]. Also, the `haskellPackages` set is included on [search.nixos.org].
The attribute names in `haskellPackages` always correspond with their name on The attribute names in `haskellPackages` always correspond with their name on
Hackage. Since Hackage allows names that are not valid Nix without extra Hackage. Since Hackage allows names that are not valid Nix without escaping,
escaping, you sometimes need to extra care when handling attribute names like you need to take care when handling attribute names like `3dmodels`.
`3dmodels`.
For packages that are part of [Stackage], we use the version prescribed by a For packages that are part of [Stackage], we use the version prescribed by a
Stackage solver (usually the current LTS one) as the default version. For all Stackage solver (usually the current LTS one) as the default version. For all
other packages we use the latest version from Hackage. See other packages we use the latest version from Hackage. See
[below](#haskell-available-versions) to learn which versions exactly are provided. [below](#haskell-available-versions) to learn which versions are provided
exactly.
Roughly half of the 16K packages contained in `haskellPackages` don't actually Roughly half of the 16K packages contained in `haskellPackages` don't actually
build and are marked as broken semi-automatically. Most of those packages are build and are marked as broken semi-automatically. Most of those packages are
deprecated or unmaintained, but sometimes packages that should, don't build. deprecated or unmaintained, but sometimes packages that should build, do not
Very often fixing them is not a lot of work. build. Very often fixing them is not a lot of work.
<!-- <!--
TODO(@sternenseemann): TODO(@sternenseemann):
@ -101,11 +101,11 @@ haskell.compiler.native-bignum.ghcHEAD ghc-native-bignum-9.7.20221224
haskell.compiler.ghcjs ghcjs-8.10.7 haskell.compiler.ghcjs ghcjs-8.10.7
``` ```
Every of those compilers has a corresponding attribute set built completely Each of those compiler versions has a corresponding attribute set built using
using it. However, the non-standard package sets are not tested regularly and it. However, the non-standard package sets are not tested regularly and, as a
have less working packages as a result. The corresponding package set for GHC result, contain fewer working packages. The corresponding package set for GHC
9.4.4 is `haskell.packages.ghc944` (in fact `haskellPackages` is just an alias 9.4.4 is `haskell.packages.ghc944`. In fact `haskellPackages` is just an alias
for `haskell.packages.ghc924`): for `haskell.packages.ghc924`:
```console ```console
$ nix-env -f '<nixpkgs>' -qaP -A haskell.packages.ghc924 $ nix-env -f '<nixpkgs>' -qaP -A haskell.packages.ghc924