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{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE RecordWildCards #-}
import Control.Applicative
import Control.Concurrent
import Control.Exception
import Data.Maybe
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 TreeSearch
import TreeView
import TreeViewRaw
import qualified Notmuch
import qualified Notmuch.Message as Notmuch
import qualified Notmuch.SearchResult as Notmuch
import qualified Data.Tree.Zipper as Z
import qualified Data.Tree as Tree
import qualified Data.Text as T
data State = State
{ charge :: IO ()
, discharge :: IO ()
, cursor :: Z.TreePos Z.Full TreeView
, xoffset :: Int
, yoffset :: Int
, flashMessage :: String
, screenWidth :: Int
, screenHeight :: Int
}
main :: IO ()
main = do
setEnv "HOME" =<< getEnv "OLDHOME"
q@State{..} <- initState
bracket_ charge discharge $ do
winchHandler
run q
initState :: IO State
initState = do
let query = "tag:inbox AND NOT tag:killed"
r_ <- either error id <$> Notmuch.search query
echo0 <- hGetEcho stdin
buffering0 <- hGetBuffering stdin
return State
{ charge = do
_ <- installHandler 28 (Catch winchHandler) Nothing
hSetEcho stdin False
hSetBuffering stdin NoBuffering
-- Save Cursor and use Alternate Screen Buffer
hPutStr stdout "\ESC[?1049h"
-- Hide Cursor
hPutStr stdout "\ESC[?25l"
-- Move the cursor to the home position
hPutStr stdout "\ESC[H"
hFlush stdout
, discharge = do
_ <- installHandler 28 Default Nothing
hSetEcho stdin echo0
hSetBuffering stdin buffering0
-- Use Normal Screen Buffer and restore Cursor
hPutStr stdout "\ESC[?1049l"
hFlush stdout
, cursor = Z.fromTree $ fromSearchResults query r_
, xoffset = 0
, yoffset = 0
, flashMessage = "Welcome to much; quit with ^C"
, screenWidth = 0
, screenHeight = 0
}
run :: State -> IO ()
run q = do
redraw q
_ <- hLookAhead stdin -- wait for input
((_, s), _) <- runScanner scan
case keymap (map toChar s) of
Just a ->
a q >>= run
Nothing ->
run q { flashMessage = show $ map toChar s }
redraw :: State -> IO ()
redraw _q@State{..} = do
--putStrLn $ describe (Z.label cursor)
--putStr "\ESC[?2J"
putStr "\ESC[H"
--mapM_ putStr $ take screenHeight $ repeat "\ESC[2K\n"
--putStr "\ESC[H"
-- consumes 1 screenHeight
putStr $ "\ESC[2K" ++ flashMessage ++ " " ++ show (screenWidth, screenHeight)
let buf = map (take screenWidth . drop xoffset) $
take (screenHeight - 1) $
drop yoffset $
renderTreeView (Z.label cursor) (Z.toTree cursor)
mapM_ (putStr . ("\n\ESC[2K"++)) $
buf
++
take (screenHeight - 1 - length buf) (repeat "~")
winchHandler :: IO ()
winchHandler = do
-- Report the size of the screen in characters.
-- Result is CSI 9 ; height ; width t
putStr "\ESC[19t"
keymap :: String -> Maybe (State -> IO State)
keymap "r" = Just replyToAll
keymap "e" = Just viewSource
keymap "k" = Just moveCursorUp
keymap "j" = Just moveCursorDown
keymap "K" = Just moveTreeDown
keymap "J" = Just moveTreeUp
keymap "\ESC[A" = Just moveCursorUp
keymap "\ESC[B" = Just moveCursorDown
keymap "\ESC[a" = Just moveTreeDown
keymap "\ESC[b" = Just moveTreeUp
keymap "\n" = Just toggleFold
keymap ('\ESC':'[':'9':';':xs) = Just $ \q@State{..} -> do
let (h,';':w) = break (==';') (take (length xs - 1) xs) -- ^ drop (assumed) trailing 't'
return q { screenWidth = read w, screenHeight = read h }
keymap _ = Nothing
moveCursorDown q@State{..} =
return q { cursor = fromMaybe (Z.root cursor) $ findNext cursor }
moveCursorUp q@State{..} =
return q { cursor = fromMaybe (Z.root cursor) $ findPrev cursor }
moveTreeUp q@State{..} =
return q { yoffset = max 0 (yoffset + 1) }
moveTreeDown q@State{..} =
return q { yoffset = max 0 (yoffset - 1) }
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 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 ->
finally (system $ editor ++ " " ++ path) charge >>= \case
ExitFailure code ->
putStrLn $ editor ++ " exit code = " ++ show code
ExitSuccess ->
return ()
return q
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 ->
finally (system $ editor ++ " " ++ path) charge >>= \case
ExitFailure code ->
putStrLn $ editor ++ " exit code = " ++ show code
ExitSuccess ->
return ()
return q
withTempFile :: FilePath -> String -> ((FilePath, Handle) -> IO a) -> IO a
withTempFile tmpdir template f = do
bracket (openTempFile tmpdir template) (removeFile . fst) f
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