From 237b7fd8b0c9c8d4ef6d7b8a758c039a217257e5 Mon Sep 17 00:00:00 2001
From: tv <tv@nomic.retiolum>
Date: Sat, 27 Feb 2016 02:03:58 +0100
Subject: Screen: init

---
 Screen.hs | 32 ++++++++++++++++++++++++++++++++
 test5.hs  | 43 +++++++++++--------------------------------
 2 files changed, 43 insertions(+), 32 deletions(-)
 create mode 100644 Screen.hs

diff --git a/Screen.hs b/Screen.hs
new file mode 100644
index 0000000..2bf0329
--- /dev/null
+++ b/Screen.hs
@@ -0,0 +1,32 @@
+{-# LANGUAGE RecordWildCards #-}
+module Screen (Screen(..), setScreen, withScreen) where
+
+import Control.Exception
+import Data.List
+import System.IO
+
+data Screen = Screen
+    { stdinEcho :: Bool
+    , stdinBufferMode :: BufferMode
+    , stdoutBufferMode :: BufferMode
+    , decsetPm :: [Int]
+    , decrstPm :: [Int]
+    }
+
+setScreen :: Screen -> IO Screen
+setScreen Screen{..} = get <* set where
+  get = Screen <$> hGetEcho stdin
+               <*> hGetBuffering stdin
+               <*> hGetBuffering stdout
+               <*> pure decrstPm
+               <*> pure decsetPm
+  set = do
+      hSetEcho stdin stdinEcho
+      hSetBuffering stdin stdinBufferMode
+      hSetBuffering stdout stdoutBufferMode
+      hPutStr stdout $ "\ESC[?" ++ intercalate ";" (map show decsetPm) ++ "h"
+      hPutStr stdout $ "\ESC[?" ++ intercalate ";" (map show decrstPm) ++ "l"
+      hFlush stdout
+
+withScreen :: Screen -> (Screen -> IO a) -> IO a
+withScreen s = bracket (setScreen s) setScreen
diff --git a/test5.hs b/test5.hs
index 4838757..1200c39 100644
--- a/test5.hs
+++ b/test5.hs
@@ -34,6 +34,7 @@ import Event
 import ParseMail (readMail)
 import RenderTreeView (renderTreeView)
 import Scanner (scan,Scan(..))
+import Screen
 import Safe
 import System.Directory
 import System.Console.Docopt.NoTH (getArgWithDefault, parseArgsOrExit, parseUsageOrExit, shortOption)
@@ -78,8 +79,6 @@ data State = State
     , headBuffer :: [Blessings String]
     , treeBuffer :: [Blessings String]
     , now :: UTCTime
-    , decset :: [Int]
-    , decrst :: [Int]
     }
 
 initState :: String -> IO State
@@ -96,14 +95,6 @@ initState query = do
         , headBuffer = []
         , treeBuffer = []
         , now = UTCTime (fromGregorian 1984 5 23) 49062
-        , decset =
-            1000 : -- X & Y on button press and release
-            1005 : -- UTF-8 mouse mode
-            1049 : -- use cleared alternate screen buffer
-            []
-        , decrst =
-            25 : -- hide cursor
-            []
         }
 
 
@@ -117,7 +108,7 @@ mainWithArgs args = do
     usage' <- parseUsageOrExit usage
     args' <- parseArgsOrExit usage' args
     let query = getArgWithDefault args' defaultSearch (shortOption 'q')
-    bracket (initState query) cleanup startup
+    withScreen s0 (\_-> initState query >>= runState)
   where
     usage = unlines
       [ "Command-line MUA using notmuch."
@@ -131,25 +122,20 @@ mainWithArgs args = do
       ]
     defaultSearch = "tag:inbox AND NOT tag:killed"
 
+    s0 = Screen False NoBuffering (BlockBuffering $ Just 4096)
+            [ 1000 -- X & Y on button press and release
+            , 1005 -- UTF-8 mouse mode
+            , 1047 -- use alternate screen buffer
+            ]
+            [   25 -- hide cursor
+            ]
 
-cleanup :: State -> IO ()
-cleanup q@State{..} = do
-    hSetEcho stdin True
-    resetTerm q { decset = decrst, decrst = decset }
-
-
-startup :: State -> IO ()
-startup q0 = do
+runState :: State -> IO ()
+runState q0 = do
 
     -- load-env hack
     maybe (return ()) (setEnv "HOME") =<< lookupEnv "OLDHOME"
 
-    -- TODO move this to resetTerm?
-    hSetBuffering stdin NoBuffering
-    hSetBuffering stdout (BlockBuffering $ Just 4096)
-
-    resetTerm q0
-
     (putEvent, getEvent) <- do
         v <- newEmptyMVar
         return (putMVar v, takeMVar v)
@@ -175,13 +161,6 @@ startup q0 = do
     mapM_ killThread threadIds
 
 
-resetTerm :: State -> IO ()
-resetTerm State{..} = do
-    hSetEcho stdin False
-    hPutStr stdout $ "\ESC[?" ++ intercalate ";" (map show decset) ++ "h"
-    hPutStr stdout $ "\ESC[?" ++ intercalate ";" (map show decrst) ++ "l"
-
-
 winchHandler :: (Event -> IO ()) -> IO ()
 winchHandler putEvent =
     Term.size >>= \case
-- 
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