test5: initial emergency commit

3 files changed, 428 insertions, 0 deletions

diff --git a/Utils.hs b/Utils.hs
new file mode 100644
index 0000000..2ccf4f7
--- /dev/null
+++ b/Utils.hs
@@ -0,0 +1,16 @@
+module Utils where
+
+import Control.Exception
+import Data.Monoid
+import System.Directory
+import System.IO
+
+
+withTempFile :: FilePath -> String -> ((FilePath, Handle) -> IO a) -> IO a
+withTempFile tmpdir template =
+    bracket (openTempFile tmpdir template) (removeFile . fst)
+
+
+mintercalate :: Monoid b => b -> [b] -> b
+mintercalate c (h:t) = foldl (\acc x -> acc <> c <> x) h t
+mintercalate _ [] = mempty
diff --git a/env.nix b/env.nix
index a98b518..500bf3e 100644
--- a/env.nix
+++ b/env.nix
@@ -31,6 +31,7 @@ let
       process
       rosezipper
       safe
+      terminalSize
     ]
   );
 
diff --git a/test5.hs b/test5.hs
new file mode 100644
index 0000000..ec90299
--- /dev/null
+++ b/test5.hs
@@ -0,0 +1,411 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module Main (main) where
+
+import qualified Data.Text as T
+import qualified Data.Tree as Tree
+import qualified Data.Tree.Zipper as Z
+import qualified Notmuch
+import qualified Notmuch.Message as Notmuch
+import qualified Notmuch.SearchResult as Notmuch
+import qualified System.Console.Terminal.Size as Term
+import Control.Applicative
+import Control.Concurrent
+import Control.Exception
+import Control.Monad
+import Data.Maybe
+import Data.Monoid
+import Scanner (scan, runScanner, toChar)
+import System.Directory
+import System.Environment
+import System.Exit
+import System.IO
+import System.Posix.Files
+import System.Posix.Signals
+import System.Process
+import Trammel
+import TreeSearch
+import TreeView
+import TreeViewRaw
+import Utils
+
+
+data Event =
+    EFlash (Trammel String) |
+    EKey String |
+    EReload |
+    EResize Int Int
+  deriving Show
+
+
+data State = State
+    { cursor :: Z.TreePos Z.Full TreeView
+    , xoffset :: Int
+    , yoffset :: Int
+    , flashMessage :: Trammel String
+    , screenWidth :: Int
+    , screenHeight :: Int
+    , headBuffer :: [Trammel String]
+    , treeBuffer :: [Trammel String]
+    }
+
+
+initState :: IO State
+initState = do
+    let query = "tag:inbox AND NOT tag:killed"
+
+    r_ <- either error id <$> Notmuch.search query
+
+    return State
+        { cursor = Z.fromTree $ fromSearchResults query r_
+        , xoffset = 0
+        , yoffset = 0
+        , flashMessage = "Welcome to much; quit with ^C"
+        , screenWidth = 0
+        , screenHeight = 0
+        , headBuffer = []
+        , treeBuffer = []
+        }
+
+
+main :: IO ()
+main = finally startup cleanup
+
+
+cleanup :: IO ()
+cleanup = do
+    hPutStr stdout "\ESC[?25h"
+    hPutStr stdout "\ESC[?1049l"
+
+
+startup :: IO ()
+startup = do
+
+    setEnv "HOME" =<< getEnv "OLDHOME"
+
+
+    hSetEcho stdin False
+    hSetBuffering stdin NoBuffering
+    hSetBuffering stdout (BlockBuffering $ Just 4096)
+
+    q0@State{..} <- initState
+
+    --hSetEcho stdin False
+    --hSetBuffering stdin NoBuffering
+    -- Save Cursor and use Alternate Screen Buffer
+    hPutStr stdout "\ESC[?1049h"
+    -- Hide Cursor
+    hPutStr stdout "\ESC[?25l"
+
+    (putEvent, getEvent) <- do
+        v <- newEmptyMVar
+        return (putMVar v, takeMVar v)
+
+    (shutdown, waitForShutdown) <- do
+        v <- newEmptyMVar
+        return (putMVar v (), takeMVar v)
+
+
+    mapM_ (\(s, f) -> installHandler s (Catch f) Nothing)
+        [ (sigINT, shutdown)
+        , (28, winchHandler putEvent)
+        ]
+
+    threadIds <- mapM forkIO
+        [ inputHandler putEvent
+        , run getEvent q0
+        ]
+
+    winchHandler putEvent
+
+    waitForShutdown
+    mapM_ killThread threadIds
+
+
+winchHandler :: (Event -> IO ()) -> IO ()
+winchHandler putEvent =
+    Term.size >>= \case
+        Just (Term.Window {Term.width = w, Term.height = h}) ->
+            putEvent $ EResize w h
+        Nothing ->
+            return ()
+
+
+inputHandler :: (Event -> IO ()) -> IO ()
+inputHandler putEvent = forever $ do
+    -- TODO make stdin configurable
+    _ <- hLookAhead stdin
+    ((_, s), _) <- runScanner scan
+    putEvent $ EKey $ map toChar s
+
+
+run :: IO Event -> State -> IO ()
+run getEvent = rec where
+    rec q = rec =<<
+        let q' = render q
+        in redraw q' >> getEvent >>= processEvent q'
+
+
+processEvent :: State -> Event -> IO State
+processEvent q = \case
+    EFlash t ->
+        return q { flashMessage = t }
+    EKey s ->
+        case keymap s of
+            Just a ->
+                a q
+            Nothing ->
+                return q { flashMessage = Plain $ show s }
+    EResize w h ->
+        return q
+            { screenWidth = w, screenHeight = h
+            , flashMessage = Plain $ "resize " <> show (w,h)
+            }
+    ev ->
+        return q
+            { flashMessage = SGR [31,1] $ Plain $ "unhandled event: " <> show ev
+            }
+
+
+render :: State -> State
+render q@State{..} =
+    q { treeBuffer = newTreeBuf
+      , headBuffer = newHeadBuf
+      }
+  where
+    newTreeBuf = renderTreeView (Z.label cursor) (Z.toTree cursor)
+    newHeadBuf =
+        [ Plain (show screenWidth) <> "x" <> Plain (show screenHeight)
+          <> " " <> Plain (show $ linearPos cursor - yoffset)
+          <> " " <> Plain (show $ topOverrun q)
+          <> " " <> Plain (show $ botOverrun q)
+          <> " " <> flashMessage
+          <> " " <> Plain (show (xoffset, yoffset))
+        ]
+
+render0 :: State -> [Trammel String]
+render0 _q@State{..} = do
+    let buffer =
+            map (trammelTake screenWidth . trammelDrop xoffset) $
+            take screenHeight $
+            headBuffer ++ drop yoffset treeBuffer
+    buffer ++ take (screenHeight - length buffer) (repeat "~")
+
+
+redraw :: State -> IO ()
+redraw q@State{..} = do
+    hPutStr stdout $ map (sub '\t' ' ') $ "\ESC[H" ++ (pp $ mintercalate "\n" $ map eraseRight $ render0 q)
+    hFlush stdout
+  where
+    sub x x' c = if c == x then x' else c
+    eraseRight s =
+        if len s < screenWidth
+            then s <> "\ESC[K"
+            else s
+
+
+
+
+keymap :: String -> Maybe (State -> IO State)
+
+keymap "r" = Just replyToAll
+keymap "e" = Just viewSource
+keymap "k" = Just $ moveCursorUp 1
+keymap "j" = Just $ moveCursorDown 1
+keymap "K" = Just $ moveTreeDown 1
+keymap "J" = Just $ moveTreeUp 1
+keymap "\ESC[A" = Just $ moveCursorUp 1
+keymap "\ESC[B" = Just $ moveCursorDown 1
+keymap "\ESC[a" = Just $ moveTreeDown 1
+keymap "\ESC[b" = Just $ moveTreeUp 1
+keymap "\ESC[c" = Just $ moveTreeLeft 1   -- S-Right
+keymap "\ESC[d" = Just $ moveTreeRight 1  -- S-Left
+keymap "\ESC[5~" = Just $ \q -> moveTreeDown (screenHeight q `div` 2) q   -- PgUp
+keymap "\ESC[6~" = Just $ \q -> moveTreeUp (screenHeight q `div` 2) q     -- PgDn
+keymap "\n" = Just toggleFold
+keymap "\DEL" = Just moveToParent -- backspace
+
+keymap _ = Nothing
+
+
+
+topOverrun :: State -> Int
+topOverrun State{..} =
+    max 0 (- (linearPos cursor - yoffset))
+
+
+botOverrun :: State -> Int
+botOverrun State{..} =
+    max 0 (linearPos cursor - yoffset - (screenHeight - (length headBuffer) - 1))
+
+
+
+moveCursorDown :: Monad m => Int -> State -> m State
+moveCursorDown n q@State{..} =
+    let cursor' = findNextN n cursor
+        q' = q { cursor = cursor' }
+    in case botOverrun q' of
+        0 -> return q'
+        i -> moveTreeUp i q'
+
+
+moveCursorUp :: Monad m => Int -> State -> m State
+moveCursorUp n q@State{..} =
+    let cursor' = findPrevN n cursor
+        q' = q { cursor = cursor' }
+    in case topOverrun q' of
+        0 -> return q'
+        i -> moveTreeDown i q'
+
+
+moveTreeUp :: Monad m => Int -> State -> m State
+moveTreeUp n q@State{..} =
+    let q' = q { yoffset = min (length treeBuffer - 1) $ max 0 (yoffset + n) }
+    in case topOverrun q' of
+        0 -> return q'
+        i -> moveCursorDown i q'
+
+
+moveTreeDown :: Monad m => Int -> State -> m State
+moveTreeDown n q@State{..} =
+    let q' = q { yoffset = min (length treeBuffer - 1) $ max 0 (yoffset - n) }
+    in case botOverrun q' of
+        0 -> return q'
+        i -> moveCursorUp i q'
+
+
+moveTreeLeft :: Monad m => Int -> State -> m State
+moveTreeLeft n q@State{..} =
+    return q { xoffset = xoffset + n }
+
+moveTreeRight :: Monad m => Int -> State -> m State
+moveTreeRight n q@State{..} =
+    return q { xoffset = max 0 (xoffset - n) }
+
+
+moveToParent :: Monad m => State -> m State
+moveToParent q@State{..} =
+    case Z.parent cursor of
+        Nothing -> return q { flashMessage = "cannot go further up" }
+        Just cursor' ->
+            let q' = q { cursor = cursor' }
+            in case topOverrun q' of
+                0 -> return q'
+                i -> moveTreeDown i q'
+
+
+toggleFold :: State -> IO State
+toggleFold q@State{..} = case Z.label cursor of
+    TVMessage m -> do
+        toggleTag (T.pack "open") m
+
+        let Just sr = findParent isTVSearchResult cursor
+            TVSearchResult the_sr = Z.label sr
+            Notmuch.ThreadID tid = Notmuch.searchThread the_sr
+
+        t_ <- return . fromMessageForest =<< Notmuch.getThread tid
+
+        let cursor' = Z.modifyTree (\(Tree.Node l _) -> Tree.Node l t_) sr
+        return q { cursor = select (==Z.label cursor) cursor' }
+
+    TVSearchResult sr -> do
+        let open = not $ null $ Tree.subForest $ Z.tree cursor
+        let Notmuch.ThreadID tid = Notmuch.searchThread sr
+
+        t_ <-
+            if open
+                then return []
+                else return . fromMessageForest =<< Notmuch.getThread tid
+
+        let cursor' = Z.modifyTree (\(Tree.Node l _) -> Tree.Node l t_) cursor
+        return q { cursor = select (==Z.label cursor) cursor' }
+
+    _ ->
+        return q { flashMessage = "nothing happened" }
+  where
+    select p loc = fromMaybe (error "cannot select") $ findTree p $ Z.root loc
+
+    toggleTag :: T.Text -> Notmuch.Message -> IO ()
+    toggleTag tag m = do
+        _ <- if tag `elem` Notmuch.messageTags m
+            then
+                Notmuch.unsetTag tagString (Notmuch.unMessageID $ Notmuch.messageId m)
+            else
+                Notmuch.setTag tagString (Notmuch.unMessageID $ Notmuch.messageId m)
+        return ()
+      where
+        tagString = T.unpack tag
+
+
+
+
+replyToAll :: State -> IO State
+replyToAll q@State{..} = case getMessage (Z.label cursor) of
+    Nothing ->
+        return q { flashMessage = "no message" }
+    Just m -> do
+        editor <- getEnv "EDITOR"
+        logname <- getEnv "LOGNAME"
+        tmpdir <- getTemporaryDirectory
+
+
+        let template = logname ++ "_much_draft_.mail"
+
+        let msgId = Notmuch.unMessageID $ Notmuch.messageId m
+
+        withTempFile tmpdir template $ \(path, draftH) -> do
+            (_, _, _, procH) <-
+                withFile "/dev/null" ReadMode $ \nullH ->
+                    createProcess
+                        (proc "notmuch" [ "reply" , "id:" ++ msgId ])
+                            { std_in = UseHandle nullH
+                            , std_out = UseHandle draftH
+                            }
+            hClose draftH
+            waitForProcess procH >>= \case
+                ExitFailure code ->
+                    putStrLn $ "notmuch exit code = " ++ show code
+                ExitSuccess ->
+                    (system $ editor ++ " " ++ path) >>= \case
+                        ExitFailure code ->
+                            putStrLn $ editor ++ " exit code = " ++ show code
+                        ExitSuccess ->
+                            return ()
+        return q
+
+
+viewSource :: State -> IO State
+viewSource q@State{..} = case getMessage (Z.label cursor) of
+    Nothing ->
+        return q { flashMessage = "no message" }
+    Just m -> do
+        editor <- getEnv "EDITOR"
+        logname <- getEnv "LOGNAME"
+        tmpdir <- getTemporaryDirectory
+
+        let template = logname ++ "_much_raw_.mail"
+
+        let msgId = Notmuch.unMessageID $ Notmuch.messageId m
+
+        withTempFile tmpdir template $ \(path, draftH) -> do
+            setFileMode path 0o400
+            (_, _, _, procH) <-
+                withFile "/dev/null" ReadMode $ \nullH ->
+                    createProcess
+                        (proc "notmuch" [ "show", "--format=raw", "id:" ++ msgId ])
+                            { std_in = UseHandle nullH
+                            , std_out = UseHandle draftH
+                            }
+            hClose draftH
+            waitForProcess procH >>= \case
+                ExitFailure code ->
+                    putStrLn $ "notmuch exit code = " ++ show code
+                ExitSuccess ->
+                    (system $ editor ++ " " ++ path) >>= \case
+                        ExitFailure code ->
+                            putStrLn $ editor ++ " exit code = " ++ show code
+                        ExitSuccess ->
+                            return ()
+        return q