Commit 811db8c6 authored by Profpatsch's avatar Profpatsch
Browse files

haskell-language-server: reformat code a bit & document better

parent 51ea6bf3

pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix

+38 −15
Original line number Diff line number Diff line 
{ lib

, stdenv

, supportedGhcVersions ? [ "94" ]

, dynamic ? true

, haskellPackages

, haskell



# Which GHC versions this hls can support.

# These are looked up in nixpkgs as `pkgs.haskell.packages."ghc${version}`.

# Run

#  $ nix-instantiate --eval -E 'with import <nixpkgs> {}; builtins.attrNames pkgs.haskell.packages'

# to list for your nixpkgs version.

, supportedGhcVersions ? [ "94" ]



# Whether to build hls with the dynamic run-time system.

# See https://haskell-language-server.readthedocs.io/en/latest/troubleshooting.html#static-binaries for more information.

, dynamic ? true

}:

#

# The recommended way to override this package is
@@ -13,9 +22,15 @@ 
# for example. Read more about this in the haskell-language-server section of the nixpkgs manual.

#

let

  inherit (lib) concatStringsSep concatMapStringsSep take splitString pipe optionals;

  inherit (haskell.lib.compose) justStaticExecutables overrideCabal enableCabalFlag disableCabalFlag;

  inherit (haskell.lib.compose)

    justStaticExecutables

    overrideCabal

    enableCabalFlag

    disableCabalFlag

    ;



  getPackages = version: haskell.packages."ghc${version}";



  tunedHls = hsPkgs:

    lib.pipe hsPkgs.haskell-language-server ([

      (haskell.lib.compose.overrideCabal (old: {
@@ -27,32 +42,40 @@ let 
        '';

      }))

      ((if dynamic then enableCabalFlag else disableCabalFlag) "dynamic")

    ] ++ optionals (!dynamic) [

    ]

    ++ lib.optionals (!dynamic) [

      justStaticExecutables

    ]);



  targets = version:

    let packages = getPackages version;

    in [

      "haskell-language-server-${packages.ghc.version}"

    ];

    in [ "haskell-language-server-${packages.ghc.version}" ];



  makeSymlinks = version:

    concatMapStringsSep "\n" (x:

    lib.concatMapStringsSep "\n"

      (x:

        "ln -s ${

          tunedHls (getPackages version)

      }/bin/haskell-language-server $out/bin/${x}") (targets version);

in assert supportedGhcVersions != []; stdenv.mkDerivation {

        }/bin/haskell-language-server $out/bin/${x}")

      (targets version);



in

assert supportedGhcVersions != []; stdenv.mkDerivation

{

  pname = "haskell-language-server";

  version = haskellPackages.haskell-language-server.version;



  buildCommand = ''

    mkdir -p $out/bin

    ln -s ${tunedHls (getPackages (builtins.head supportedGhcVersions))}/bin/haskell-language-server-wrapper $out/bin/haskell-language-server-wrapper

    ${concatMapStringsSep "\n" makeSymlinks supportedGhcVersions}

    ${lib.concatMapStringsSep "\n" makeSymlinks supportedGhcVersions}

  '';



  meta = haskellPackages.haskell-language-server.meta // {

    maintainers = [ lib.maintainers.maralorn ];

    longDescription = ''

      This package provides the executables ${

        concatMapStringsSep ", " (x: concatStringsSep ", " (targets x))

        lib.concatMapStringsSep ", " (x: lib.concatStringsSep ", " (targets x))

        supportedGhcVersions

      } and haskell-language-server-wrapper.

      You can choose for which ghc versions to install hls with pkgs.haskell-language-server.override { supportedGhcVersions = [ "90" "92" ]; }.