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[WIP]: Nix env support for the wrapper #490

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[WIP]: Nix env support for the wrapper #490

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20 changes: 17 additions & 3 deletions exe/Wrapper.hs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,4 @@
{-# LANGUAGE RecordWildCards #-}
-- | This module is based on the hie-wrapper.sh script in
-- https://github.com/alanz/vscode-hie-server
module Main where

import Control.Monad.Extra
Expand Down Expand Up @@ -42,9 +40,25 @@ main = do
VersionMode PrintNumericVersion ->
putStrLn haskellLanguageServerNumericVersion

NixMode nixModeArgs -> loadNixEnv nixArgs

LspMode lspArgs ->
launchHaskellLanguageServer lspArgs

loadNixEnv :: NixArguments -> IO ()
loadNixEnv nixModeArgs = do
s <- doesFileExist $ "shell.nix"
if s then loadNixShell s else do
d <- doesFileExist $ "default.nix"
if d then loadNixShell d else do
die $ "Nix environment requires `shell.nix` or `default.nix`, but none of them was found. Nix environment can be bootstrapped by `cabal2nix --shell . > default.nix`."
where
loadNixShell nixModeArgs = do
nixShell <- findExecutable "nix-shell"
case nixShell of
Nothing -> die $ "`--nix` option was provided, which requires `nix-shell` to load Nix enviroment, but this executable was not found."
Just nsexe -> callProcess nsexe nixModArgs

launchHaskellLanguageServer :: LspArguments -> IO ()
launchHaskellLanguageServer LspArguments{..} = do
whenJust argsCwd setCurrentDirectory
Expand Down Expand Up @@ -104,6 +118,7 @@ getRuntimeGhcVersion' cradle = do
case actionName (cradleOptsProg cradle) of
Stack -> checkToolExists "stack"
Cabal -> checkToolExists "cabal"
Nix -> checkToolExists "nix"
Default -> checkToolExists "ghc"
Direct -> checkToolExists "ghc"
_ -> pure ()
Expand Down Expand Up @@ -143,4 +158,3 @@ findLocalCradle fp = do
Nothing -> loadImplicitCradle fp
hPutStrLn stderr $ "Module \"" ++ fp ++ "\" is loaded by Cradle: " ++ show crdl
return crdl

1 change: 1 addition & 0 deletions src/Ide/Version.hs
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Expand Up @@ -54,6 +54,7 @@ findProgramVersions :: IO ProgramsOfInterest
findProgramVersions = ProgramsOfInterest
<$> findVersionOf "cabal"
<*> findVersionOf "stack"
<*> findVersionOf "nix"
<*> findVersionOf "ghc"

-- | Find the version of the given program.
Expand Down