+withVirtualPath :: GHCi a -> GHCi a
+withVirtualPath m = do
+ ghci_wd <- io getCurrentDirectory -- Store the cwd of GHCi
+ st <- getGHCiState
+ io$ setCurrentDirectory (virtual_path st)
+ result <- m -- Evaluate in the virtual wd..
+ vwd <- io getCurrentDirectory
+ setGHCiState (st{ virtual_path = vwd}) -- Update the virtual path
+ io$ setCurrentDirectory ghci_wd -- ..and restore GHCi wd
+ return result
+
+runStmt :: String -> GHC.SingleStep -> GHCi GHC.RunResult
+runStmt expr step = withVirtualPath$ do
+ st <- getGHCiState
+ reifyGHCi $ \x ->
+ withProgName (progname st) $
+ withArgs (args st) $
+ reflectGHCi x $ do
+ GHC.handleSourceError (\e -> do GHC.printExceptionAndWarnings e
+ return GHC.RunFailed) $ do
+ GHC.runStmt expr step
+
+resume :: GHC.SingleStep -> GHCi GHC.RunResult
+resume step = withVirtualPath$ do
+ GHC.resume step
+
+