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|
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module Main (main) where
import qualified Data.Text as T
import qualified Data.Text.IO 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.List (intercalate)
import Data.Maybe
import Data.Monoid
import Data.Time
import Event
import RenderTreeView (renderTreeView)
import Scanner (scan)
import System.Directory
import System.Environment
import System.Exit
import System.IO
import System.Posix.Files
import System.Posix.Signals
import System.Process
import TagUtils
import Trammel
import TreeSearch
import TreeView
import Utils
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]
, now :: UTCTime
, decset :: [Int]
, decrst :: [Int]
}
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 = []
, 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
[]
}
main :: IO ()
main =
bracket initState cleanup startup
cleanup :: State -> IO ()
cleanup q@State{..} = do
hSetEcho stdin True
resetTerm q { decset = decrst, decrst = decset }
startup :: State -> IO ()
startup 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)
(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
[ forever $ scan stdin >>= putEvent
, run getEvent q0
]
winchHandler putEvent
waitForShutdown
mapM_ killThread threadIds
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
Just (Term.Window {Term.width = w, Term.height = h}) ->
putEvent $ EResize w h
Nothing ->
return ()
run :: IO Event -> State -> IO ()
run getEvent = rec where
rec q = rec =<< do
t <- getCurrentTime
let q' = render q { now = t }
redraw q' >> getEvent >>= processEvent q'
-- TODO merge EKey and EMouse?
processEvent :: State -> Event -> IO State
processEvent q = \case
EFlash t ->
return q { flashMessage = t }
EKey s ->
keymap s q
EMouse info ->
mousemap info q
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 now cursor (Z.root 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 -> State -> IO State
keymap "a" = toggleTagAtCursor "inbox"
keymap "s" = toggleTagAtCursor "unread"
keymap "&" = toggleTagAtCursor "killed"
keymap "*" = toggleTagAtCursor "star"
keymap "r" = replyToAll
keymap "e" = viewSource
keymap "t" = editTags
keymap "k" = moveCursorUp 1
keymap "j" = moveCursorDown 1
keymap "K" = moveTreeDown 1
keymap "J" = moveTreeUp 1
keymap "\ESC[A" = moveCursorUp 1
keymap "\ESC[B" = moveCursorDown 1
keymap "\ESC[a" = moveTreeDown 1
keymap "\ESC[b" = moveTreeUp 1
keymap "\ESC[c" = moveTreeLeft 1 -- S-Right
keymap "\ESC[d" = moveTreeRight 1 -- S-Left
keymap "\ESC[5~" = \q -> moveTreeDown (screenHeight q `div` 2) q -- PgUp
keymap "\ESC[6~" = \q -> moveTreeUp (screenHeight q `div` 2) q -- PgDn
keymap "\n" = toggleFold
keymap "\ESC[Z" = moveCursorUpToPrevUnread -- S-Tab
keymap "\t" = moveCursorDownToNextUnread
keymap "\DEL" = moveToParent -- backspace
-- TODO Stuff Vim sends after exit (also there is more...)
keymap "\ESC[2;2R" = \q -> return q { flashMessage = flashMessage q <> " " <> Plain "stupid" }
keymap "\ESC[>85;95;0c" = \q -> return q { flashMessage = flashMessage q <> " " <> Plain "stupid" }
keymap s = \q ->
return q { flashMessage = Plain $ show s }
mousemap :: MouseInfo -> State -> IO State
mousemap MouseInfo{mouseButton=1,mouseY=y} = defaultMouse1Click y
mousemap MouseInfo{mouseButton=3,mouseY=y} = \q -> defaultMouse1Click y q >>= toggleFold
mousemap MouseInfo{mouseButton=4} = moveTreeDown 3
mousemap MouseInfo{mouseButton=5} = moveTreeUp 3
mousemap MouseInfo{mouseButton=0} = return
mousemap info = \q ->
return q { flashMessage = SGR [38,5,202] $ Plain $ show info }
defaultMouse1Click y q@State{..} = do
let linearClickPos =
let i = (y - length headBuffer + yoffset) - 1 {-zero-based-}
in if 0 <= i && i < length treeBuffer
then Just i
else Nothing
case linearClickPos of
Nothing ->
return q
{ flashMessage = Plain $ "nothing to click"
}
Just i ->
return q
{ cursor = findNextN i $ Z.root cursor
}
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'
moveCursorToUnread
:: (Num a, Monad m, Eq a)
=> (Z.TreePos Z.Full TreeView -> Maybe (Z.TreePos Z.Full TreeView))
-> (State -> a)
-> (a -> State -> m State)
-> State -> m State
moveCursorToUnread cursorMove getTreeMoveCount treeMove q@State{..} =
case cursorMove cursor >>= rec of
Just cursor' ->
let q' = q { cursor = cursor' }
in case getTreeMoveCount q' of
0 -> return q'
i -> treeMove i q'
Nothing ->
return q { flashMessage = "no unread message in sight" }
where
rec loc =
if hasTag "unread" loc
then Just loc
else cursorMove loc >>= rec
hasTag tag loc =
case Z.label loc of
TVSearchResult sr ->
tag `elem` Notmuch.searchTags sr
TVMessage m ->
tag `elem` Notmuch.messageTags m
_ ->
False
moveCursorUpToPrevUnread :: Monad m => State -> m State
moveCursorUpToPrevUnread =
moveCursorToUnread findPrev topOverrun moveTreeDown
moveCursorDownToNextUnread :: Monad m => State -> m State
moveCursorDownToNextUnread =
moveCursorToUnread findNext botOverrun moveTreeUp
toggleFold :: State -> IO State
toggleFold q@State{..} = case Z.label cursor of
TVMessage _ -> do
q' <- toggleTagAtCursor "open" q
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
toggleTagAtCursor :: Tag -> State -> IO State
toggleTagAtCursor tag q@State{..} = case Z.label cursor of
TVMessage m -> do
-- TODO modify search result tags
-- TODO check Notmuch.{set,unset}Tag result
if tag `elem` Notmuch.messageTags m
then do
Notmuch.unsetTag (T.unpack tag) (Notmuch.unMessageID $ Notmuch.messageId m)
let cursor' = Z.modifyTree (patchRootLabelTags [DelTag tag]) cursor
return q { cursor = cursor' }
else do
Notmuch.setTag (T.unpack tag) (Notmuch.unMessageID $ Notmuch.messageId m)
let cursor' = Z.modifyTree (patchRootLabelTags [AddTag tag]) cursor
return q { cursor = cursor' }
_ -> return q { flashMessage = "nothing happened" }
replyToAll :: State -> IO State
replyToAll q@State{..} = case getMessage (Z.label cursor) of
Nothing ->
return q { flashMessage = "no message" }
Just m -> do
let msgId = Notmuch.unMessageID $ Notmuch.messageId m
withTempFile' "draft.mail" $ \(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 ->
return q { flashMessage =
Plain $ "notmuch exit code = " ++ show code
}
ExitSuccess ->
runEditor path q
viewSource :: State -> IO State
viewSource q@State{..} = case getMessage (Z.label cursor) of
Nothing ->
return q { flashMessage = "no message" }
Just m -> do
let msgId = Notmuch.unMessageID $ Notmuch.messageId m
withTempFile' "raw.mail" $ \(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 ->
return q { flashMessage =
Plain $ "notmuch exit code = " ++ show code
}
ExitSuccess ->
runEditor path q
-- TODO editTags is too convoluted
editTags :: State -> IO State
editTags q@State{..} = case Z.label cursor of
TVSearchResult sr -> do
edit
(Notmuch.searchTags sr)
("thread:" <> (Notmuch.unThreadID $ Notmuch.searchThread sr))
(\tagOps loc ->
Z.modifyTree (patchTreeTags tagOps) loc
)
TVMessage m -> do
edit
(Notmuch.messageTags m)
("id:" <> (Notmuch.unMessageID $ Notmuch.messageId m)) -- TODO describe war besser
(\tagOps mloc ->
-- TODO this needs test cases
let
-- patch message
mloc' = Z.modifyTree (patchRootLabelTags tagOps) mloc
-- find search result of message
srloc = fromMaybe (error "could not find search result of message")
(findParent isTVSearchResult mloc')
-- patch search result
srloc' = Z.modifyTree (patchRootLabelTags tagOps) srloc
in
-- return message
fromMaybe (error "could not find message again")
(findTree (==Z.label mloc) srloc')
)
_ ->
return q { flashMessage = "cannot edit tags here" }
where
edit tags query patch = do
withTempFile' ".tags" $ \(path, draftH) -> do
hPutStr stdout "\ESC[?1049h" -- TODO geht besser
hPutStr stdout "\ESC[?25l" -- TODO war mal besser
setFileMode path 0o600
-- generate draft
T.hPutStrLn draftH $ T.intercalate " " tags
hPutStrLn draftH $ "# " <> query
hClose draftH
runEditor' path q >>= \case
ExitFailure code -> do
return q { flashMessage = Plain $ "editor exit code = " ++ show code }
ExitSuccess -> do
-- TODO parse could fail
tags' <- parseTags <$> readFile path
case diffTags tags tags' of
[] ->
return q { flashMessage = Plain "nothing happened" } -- TODO highlight
tagOps -> do
(_, _, _, procH) <-
withFile "/dev/null" ReadWriteMode $ \nullH ->
-- TODO batch tagging(?)
-- TODO proper type for query
createProcess
(proc "notmuch" $ [ "tag" ] ++ tagOpsToArgs tagOps ++ [ "--", query ])
{ std_in = UseHandle nullH
, std_out = UseHandle nullH
}
waitForProcess procH >>= \case
ExitFailure code ->
return q { flashMessage = Plain $ "notmuch exit code = " ++ show code }
ExitSuccess ->
return q { cursor = select (==Z.label cursor) (patch tagOps cursor) }
-- TODO DRY select
select p loc =
let root = Z.root loc
in fromMaybe root $ findTree p root
runEditor :: FilePath -> State -> IO State
runEditor path q@State{..} =
runEditor' path q >>= \case
ExitFailure code ->
return q { flashMessage =
Plain $ "editor exit code = " ++ show code
}
ExitSuccess ->
return q
runEditor' :: [Char] -> State -> IO ExitCode
runEditor' path q@State{..} = do
editor <- getEnv "EDITOR"
system (editor ++ " " ++ path) <* resetTerm q
withTempFile' :: FilePath -> ((FilePath, Handle) -> IO a) -> IO a
withTempFile' s f = do
logname <- getEnv "LOGNAME"
tmpdir <- getTemporaryDirectory
withTempFile tmpdir (logname ++ "_much_" ++ s) f
|