Merge branch 'bugfix/terminal-init-flags'

src/Graphics/Vty/Input.hs

@@ -143,22 +143,8 @@ import Data.Monoid ((<>))
 -- bytes comes from 'classifyMapForTerm' which is then overridden by
 -- the the applicable entries from the configuration's 'inputMap'.
 --
--- The terminal device is configured with the attributes:
---
--- * IXON disabled: disables software flow control on outgoing data.
--- This stops the process from being suspended if the output terminal
--- cannot keep up.
---
--- * Raw mode is used for input.
---
--- * ISIG disabled (enables keyboard combinations that result in
--- signals)
---
--- * ECHO disabled (input is not echoed to the output)
---
--- * ICANON disabled (canonical mode (line mode) input is not used)
---
--- * IEXTEN disabled (extended functions are disabled)
+-- The terminal device's mode flags are configured by the
+-- 'attributeControl' function.
 inputForConfig :: Config -> IO Input
 inputForConfig config@Config{ termName = Just termName
                             , inputFd = Just termFd
@@ -168,7 +154,7 @@ inputForConfig config@Config{ termName = Just termName
     terminal <- Terminfo.setupTerm termName
     let inputOverrides = [(s,e) | (t,s,e) <- inputMap, t == Nothing || t == Just termName]
         activeInputMap = classifyMapForTerm termName terminal `mappend` inputOverrides
-    (setAttrs,unsetAttrs) <- attributeControl termFd
+    (setAttrs, unsetAttrs) <- attributeControl termFd
     setAttrs
     input <- initInput config activeInputMap
     let pokeIO = Catch $ do
@@ -177,11 +163,15 @@ inputForConfig config@Config{ termName = Just termName
             atomically $ writeTChan (input^.eventChannel) (EvResize e e)
     _ <- installHandler windowChange pokeIO Nothing
     _ <- installHandler continueProcess pokeIO Nothing
+
+    let restore = unsetAttrs
+
     return $ input
         { shutdownInput = do
             shutdownInput input
             _ <- installHandler windowChange Ignore Nothing
             _ <- installHandler continueProcess Ignore Nothing
-            unsetAttrs
+            restore
+        , restoreInputState = restoreInputState input >> restore
         }
 inputForConfig config = (<> config) <$> standardIOConfig >>= inputForConfig

src/Graphics/Vty/Input/Loop.hs

@@ -52,9 +52,14 @@ data Input = Input
       -- 'nextEvent' this will not refresh the display if the next event
       -- is an 'EvResize'.
       _eventChannel  :: TChan Event
-      -- | Shuts down the input processing. This should return the
-      -- terminal input state to before he input initialized.
+      -- | Shuts down the input processing. As part of shutting down the
+      -- input, this should also restore the input state.
     , shutdownInput :: IO ()
+      -- | Restore the terminal's input state to what it was prior
+      -- to configuring input for Vty. This should be done as part of
+      -- 'shutdownInput' but is exposed in case you need to access it
+      -- directly.
+    , restoreInputState :: IO ()
       -- | Changes to this value are reflected after the next event.
     , _configRef :: IORef Config
       -- | input debug log
@@ -171,15 +176,47 @@ runInputProcessorLoop classifyTable input = do
                             <*> pure (classify classifyTable)
         runReaderT (evalStateT loopInputProcessor s0) input
 
+-- | Construct two IO actions: one to configure the terminal for Vty and
+-- one to restore the terminal mode flags to the values they had at the
+-- time this function was called.
+--
+-- This function constructs a configuration action to clear the
+-- following terminal mode flags:
+--
+-- * IXON disabled: disables software flow control on outgoing data.
+-- This stops the process from being suspended if the output terminal
+-- cannot keep up.
+--
+-- * Raw mode is used for input.
+--
+-- * ISIG (enables keyboard combinations that result in
+-- signals)
+--
+-- * ECHO (input is not echoed to the output)
+--
+-- * ICANON (canonical mode (line mode) input is not used)
+--
+-- * IEXTEN (extended functions are disabled)
+--
+-- The configuration action also explicitly sets these flags:
+--
+-- * ICRNL (input carriage returns are mapped to newlines)
 attributeControl :: Fd -> IO (IO (), IO ())
 attributeControl fd = do
     original <- getTerminalAttributes fd
-    let vtyMode = foldl withoutMode original [ StartStopOutput, KeyboardInterrupts
-                                             , EnableEcho, ProcessInput, ExtendedFunctions
-                                             ]
+    let vtyMode = foldl withMode clearedFlags flagsToSet
+        clearedFlags = foldl withoutMode original flagsToUnset
+        flagsToSet = [ MapCRtoLF -- ICRNL
+                     ]
+        flagsToUnset = [ StartStopOutput -- IXON
+                       , KeyboardInterrupts -- ISIG
+                       , EnableEcho -- ECHO
+                       , ProcessInput -- ICANON
+                       , ExtendedFunctions -- IEXTEN
+                       ]
     let setAttrs = setTerminalAttributes fd vtyMode Immediately
         unsetAttrs = setTerminalAttributes fd original Immediately
-    return (setAttrs,unsetAttrs)
+    return (setAttrs, unsetAttrs)
 
 logInitialInputState :: Input -> ClassifyMap -> IO()
 logInitialInputState input classifyTable = case _inputDebug input of
@@ -203,6 +240,7 @@ initInput config classifyTable = do
     applyConfig fd config
     stopSync <- newEmptyMVar
     input <- Input <$> atomically newTChan
+                   <*> pure (return ())
                    <*> pure (return ())
                    <*> newIORef config
                    <*> maybe (return Nothing)