Add ability to override some config via env vars

[lsp-test.git] / src / Language / Haskell / LSP / Test.hs

diff --git a/src/Language/Haskell/LSP/Test.hs b/src/Language/Haskell/LSP/Test.hs
index 1a3b2e2ad7098511fc9a27ce67480ac6f2adcd95..03e2a1a55e13f4c32996c2305acf8e328ea6f3ec 100644 (file)
--- a/src/Language/Haskell/LSP/Test.hs
+++ b/src/Language/Haskell/LSP/Test.hs
@@ -110,6 +110,7 @@ import Language.Haskell.LSP.Test.Exceptions
 import Language.Haskell.LSP.Test.Parsing
 import Language.Haskell.LSP.Test.Session
 import Language.Haskell.LSP.Test.Server
+import System.Environment
 import System.IO
 import System.Directory
 import System.FilePath
@@ -137,10 +138,12 @@ runSessionWithConfig :: SessionConfig -- ^ Configuration options for the session
                      -> FilePath -- ^ The filepath to the root directory for the session.
                      -> Session a -- ^ The session to run.
                      -> IO a
-runSessionWithConfig config serverExe caps rootDir session = do
+runSessionWithConfig config' serverExe caps rootDir session = do
   pid <- getCurrentProcessID
   absRootDir <- canonicalizePath rootDir
 
+  config <- envOverrideConfig config'
+
   let initializeParams = InitializeParams (Just pid)
                                           (Just $ T.pack absRootDir)
                                           (Just $ filePathToUri absRootDir)
@@ -185,6 +188,15 @@ runSessionWithConfig config serverExe caps rootDir session = do
       (RspShutdown _) -> return ()
       _               -> listenServer serverOut context
 
+  -- | Check environment variables to override the config
+  envOverrideConfig :: SessionConfig -> IO SessionConfig
+  envOverrideConfig cfg = do
+    logMessages' <- fromMaybe (logMessages cfg) <$> checkEnv "LSP_TEST_LOG_MESSAGES"
+    logStdErr' <- fromMaybe (logStdErr cfg) <$> checkEnv "LSP_TEST_LOG_STDERR"
+    return $ cfg { logMessages = logMessages', logStdErr = logStdErr' }
+    where checkEnv :: String -> IO (Maybe Bool)
+          checkEnv s = fmap (const True) <$> lookupEnv s
+
 -- | The current text contents of a document.
 documentContents :: TextDocumentIdentifier -> Session T.Text
 documentContents doc = do