Simplify nix setup (#531)

* Simplify nix setup

This doesn't try to build the dependencies, just provides GHC/cabal/HLS.

* Add cabal-fmt and fourmolu

* Updated fourmolu

* Use the default GHC

fourmolu.yaml

@@ -1 +1,2 @@
 indentation: 2
+single-constraint-parens: auto

lsp-test/src/Language/LSP/Test.hs

@@ -753,15 +753,15 @@ executeCodeAction action = do
     let req = TRequestMessage "" (IdInt 0) SMethod_WorkspaceApplyEdit (ApplyWorkspaceEditParams Nothing e)
      in updateState (FromServerMess SMethod_WorkspaceApplyEdit req)
 
--- |Resolves the provided code action.
+-- | Resolves the provided code action.
 resolveCodeAction :: CodeAction -> Session CodeAction
 resolveCodeAction ca = do
   rsp <- request SMethod_CodeActionResolve ca
   case rsp ^. L.result of
     Right ca -> return ca
     Left er -> throw (UnexpectedResponseError (SomeLspId $ fromJust $ rsp ^. L.id) er)
 
-{- |If a code action contains a _data_ field: resolves the code action, then
+{- | If a code action contains a _data_ field: resolves the code action, then
  executes it. Otherwise, just executes it.
 -}
 resolveAndExecuteCodeAction :: CodeAction -> Session ()
@@ -821,7 +821,7 @@ getAndResolveCompletions doc pos = do
   items <- getCompletions doc pos
   for items $ \item -> if isJust (item ^. L.data_) then resolveCompletion item else pure item
 
--- |Resolves the provided completion item.
+-- | Resolves the provided completion item.
 resolveCompletion :: CompletionItem -> Session CompletionItem
 resolveCompletion ci = do
   rsp <- request SMethod_CompletionItemResolve ci
@@ -956,7 +956,7 @@ getAndResolveCodeLenses tId = do
   codeLenses <- getCodeLenses tId
   for codeLenses $ \codeLens -> if isJust (codeLens ^. L.data_) then resolveCodeLens codeLens else pure codeLens
 
--- |Resolves the provided code lens.
+-- | Resolves the provided code lens.
 resolveCodeLens :: CodeLens -> Session CodeLens
 resolveCodeLens cl = do
   rsp <- request SMethod_CodeLensResolve cl

lsp-test/src/Language/LSP/Test/Replay.hs

@@ -2,7 +2,8 @@
  and validating that the server output matches up with another log.
 -}
 module Language.LSP.Test.Replay (
-  )
+
+)
 where
 
 -- replaySession

lsp-types/src/Language/LSP/Protocol/Types/WatchKinds.hs

@@ -7,31 +7,31 @@ import Language.LSP.Protocol.Types.LspEnum (fromOpenEnumBaseType, toEnumBaseType
 -- WatchKind is better represented as a Set than as enum. As the lsp spec
 -- defines them as an enum, these helper functions help bridge the difference.
 
--- |Tests whether `WatchKind_Create` is contained in the provided WatchKind enum
+-- | Tests whether `WatchKind_Create` is contained in the provided WatchKind enum
 containsCreate :: WatchKind -> Bool
 containsCreate WatchKind_Create = True
 containsCreate (WatchKind_Custom 3) = True
 containsCreate (WatchKind_Custom 5) = True
 containsCreate (WatchKind_Custom 7) = True
 containsCreate _ = False
 
--- |Tests whether `WatchKind_Change` is contained in the provided WatchKind enum
+-- | Tests whether `WatchKind_Change` is contained in the provided WatchKind enum
 containsChange :: WatchKind -> Bool
 containsChange WatchKind_Change = True
 containsChange (WatchKind_Custom 3) = True
 containsChange (WatchKind_Custom 6) = True
 containsChange (WatchKind_Custom 7) = True
 containsChange _ = False
 
--- |Tests whether `WatchKind_Delete` is contained in the provided WatchKind enum
+-- | Tests whether `WatchKind_Delete` is contained in the provided WatchKind enum
 containsDelete :: WatchKind -> Bool
 containsDelete WatchKind_Delete = True
 containsDelete (WatchKind_Custom 5) = True
 containsDelete (WatchKind_Custom 6) = True
 containsDelete (WatchKind_Custom 7) = True
 containsDelete _ = False
 
-{- |Combine a set of WatchKind types into a new WatchKind type that accurately
+{- | Combine a set of WatchKind types into a new WatchKind type that accurately
  represents the set
 -}
 combineWatchKinds :: Set WatchKind -> WatchKind

lsp/src/Language/LSP/VFS.hs

@@ -538,9 +538,9 @@ getCompletionPrefix pos@(J.Position l c) (VirtualFile _ _ ropetext) =
     beforePos <- Rope.toText . fst <$> Rope.splitAt (fromIntegral c) curRope
     curWord <-
       if
-          | T.null beforePos -> Just ""
-          | T.last beforePos == ' ' -> Just "" -- don't count abc as the curword in 'abc '
-          | otherwise -> lastMaybe (T.words beforePos)
+        | T.null beforePos -> Just ""
+        | T.last beforePos == ' ' -> Just "" -- don't count abc as the curword in 'abc '
+        | otherwise -> lastMaybe (T.words beforePos)
 
     let parts =
           T.split (== '.') $

nix/default.nix

@@ -1,23 +1,3 @@
 { sources ? import ./sources.nix }:
 
-let
-  overlay = self: super:
-    let
-      inherit (import sources."gitignore.nix" { inherit (super) lib; })
-        gitignoreSource;
-      ourSources = {
-        lsp = gitignoreSource ../lsp;
-        lsp-test = gitignoreSource ../lsp-test;
-        lsp-types = gitignoreSource ../lsp-types;
-      };
-
-    in {
-      inherit gitignoreSource;
-      inherit ourSources;
-      ourHaskellPackages = with super.haskell.lib;
-        super.haskellPackages.extend (packageSourceOverrides ourSources);
-    };
-in (import sources.nixpkgs {
-  overlays = [ overlay ];
-  config = { allowBroken = true; };
-})
+import sources.nixpkgs { }

nix/sources.json

@@ -5,10 +5,10 @@
         "homepage": "",
         "owner": "hercules-ci",
         "repo": "gitignore.nix",
-        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
-        "sha256": "07vg2i9va38zbld9abs9lzqblz193vc5wvqd6h7amkmwf66ljcgh",
+        "rev": "9e21c80adf67ebcb077d75bd5e7d724d21eeafd6",
+        "sha256": "1lbkgn94y8850g7idqnbji12pscxjwrspnzmx8fmm7xmy9ablk5y",
         "type": "tarball",
-        "url": "https://github.com/hercules-ci/gitignore.nix/archive/a20de23b925fd8264fd7fad6454652e142fd7f73.tar.gz",
+        "url": "https://github.com/hercules-ci/gitignore.nix/archive/9e21c80adf67ebcb077d75bd5e7d724d21eeafd6.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {
@@ -17,10 +17,10 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "7225521219f64df00de86c3b946a26f608f3b4dc",
-        "sha256": "04w9c06f70n0k9c4xhma4nfrkxxg7d039xd3v9dak8xd7avjb7v0",
+        "rev": "723f0eeb969a730db3c30f977c2b66b9dce9fe4a",
+        "sha256": "0016l7230gd2kdh0g2w573r9a2krqb7x4ifcjhhsn4h1bwap7qr0",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/7225521219f64df00de86c3b946a26f608f3b4dc.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/723f0eeb969a730db3c30f977c2b66b9dce9fe4a.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
@@ -29,10 +29,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b969a89c3e84a121c9b3af2e4ef277cd822b988a",
-        "sha256": "0qib8p3iscj7l3i6y03x1f5fhmn8336nbk7lg2hwvx44cpy63jvz",
+        "rev": "9ea24fc7e02b65c150c88e1412400b70087bd382",
+        "sha256": "002abgrz7gdj99gzyhmkpxx8j3x5grapmal9i0r580phvin9g2r5",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/b969a89c3e84a121c9b3af2e4ef277cd822b988a.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/9ea24fc7e02b65c150c88e1412400b70087bd382.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }

shell.nix

@@ -1,10 +1,15 @@
-{ withHoogle ? false, nixpkgs ? import ./nix { } }:
+{ nixpkgs ? import ./nix { } }:
 with nixpkgs;
-with ourHaskellPackages;
-shellFor {
-  inherit withHoogle;
-  doBenchmark = true;
-  doTest = true;
-  packages = p: with builtins; map (name: p.${name}) (attrNames ourSources);
-  buildInputs = [ cabal-install nixpkgs.haskellPackages.haskell-language-server nixpkgs.haskellPackages.fourmolu ];
+let 
+  hsPkgs = haskellPackages;
+  ghc = haskellPackages.ghc;
+in mkShell {
+  nativeBuildInputs = [ 
+    hsPkgs.ghc 
+    hsPkgs.haskell-language-server 
+    haskellPackages.cabal-fmt
+    haskellPackages.fourmolu
+    cabal-install 
+    zlib 
+    pkg-config ];
 }