1 module Language.Haskell.LSP.Test.Server (withServer) where
3 import Control.Concurrent
9 withServer :: String -> (Handle -> Handle -> Int -> IO a) -> IO a
10 withServer serverExe f = do
11 let cmd:args = words serverExe
12 createProc = (proc cmd args) { std_in = CreatePipe, std_out = CreatePipe, std_err = CreatePipe }
13 (Just serverIn, Just serverOut, Just serverErr, serverProc) <- createProcess createProc
15 -- Need to continuously consume to stderr else it gets blocked
16 -- Can't pass NoStream either to std_err
17 hSetBuffering serverErr NoBuffering
18 errSinkThread <- forkIO $ forever $ hGetLine serverErr
20 pid <- fromIntegral . fromJust <$> getPid serverProc
22 result <- f serverIn serverOut pid
24 killThread errSinkThread
25 terminateProcess serverProc