From 13f22aec257e3650efb7eabadf9c5ddf16e14e18 Mon Sep 17 00:00:00 2001
From: Malte Brandy <malte.brandy@maralorn.de>
Date: Wed, 23 Sep 2020 00:43:31 +0200
Subject: [PATCH] haskellPackages.haskell-language-server: Add aliases with ghc
 version

Needed by haskell-language-server-wrapper to discover the correct
binary. Especially useful when installing hls from multiple ghc version.
---
 pkgs/development/haskell-modules/configuration-nix.nix | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index a1938de0ab37..9be625683732 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -782,4 +782,14 @@ self: super: builtins.intersectAttrs super {
     testToolDepends = [ pkgs.git pkgs.mercurial ];
   });
 
+  haskell-language-server = overrideCabal super.haskell-language-server (drv: {
+    postInstall = let
+      inherit (pkgs.lib) concatStringsSep take splitString;
+      ghc_version = self.ghc.version;
+      ghc_major_version = concatStringsSep "." (take 2 (splitString "." ghc_version));
+    in ''
+        ln -s $out/bin/haskell-language-server $out/bin/haskell-language-server-${ghc_version}
+        ln -s $out/bin/haskell-language-server $out/bin/haskell-language-server-${ghc_major_version}
+       '';
+  });
 }