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|
{- Lazymail interaction with curses.
-
- Copyright 2013 Raúl Benencia <rul@kalgan.cc>
-
- Licensed under the GNU GPL version 3 or higher
-
-}
module Screen where
import Control.Monad.Trans(liftIO)
import Control.Monad.Reader
import Control.Monad.State
import Data.List(isPrefixOf)
import UI.NCurses as UI
import Text.ParserCombinators.Parsec.Rfc2822(Message(..))
-- Local imports
import Config
import Lazymail
import Maildir
import Email
import Print
import Rfc1342
import State
type LazymailCurses = ReaderT LazymailConfig (StateT LazymailState Curses)
liftCurses = lift . lift
entryPoint :: Lazymail ()
entryPoint = do
st <- get
cfg <- ask
maildirs <- liftIO $ getMaildirsRecursively $ basePath st
liftIO $ runCurses $ runStateT (runReaderT startCurses cfg) st
return ()
startCurses :: LazymailCurses ()
startCurses = do
st <- get
(rows, columns) <- liftCurses $ do
UI.setEcho False
UI.screenSize
return ()
{-- | Main entry point
entryPoint :: MState -> IO ()
entryPoint st' = do
maildirs <- getMaildirsRecursively (initPath st')
putStrLn $ "We could get " ++ (show . length) maildirs ++ " maildirs."
runCurses $ do
setEcho False
(rows, columns) <- screenSize
selColID <- newColorID ColorBlack ColorWhite 1
staColID <- newColorID ColorWhite ColorGreen 2
let st = st' {
scrRows = rows - 1
, scrColumns = columns - 1
, selectedColorID = selColID
, statusColorID = staColID
, detectedMDs = maildirs }
screenLoop st
-- | This functions will loop til the user decides to leave
screenLoop :: MState -> Curses ()
screenLoop st = do
w <- defaultWindow
st' <- updateWindow w $ do
clearMain (scrRowsAsInt st) (scrColsAsInt st)
st'' <- drawMode (mode st) st
drawStatus st''
return st''
render
st'' <- handleEvent st'
if (not . exitRequested) st''
then screenLoop st''
else return ()
-- | Pattern match on the received mode and draw it in the screen.
drawMode :: Mode -> MState -> Update MState
drawMode MaildirMode st = drawMaildirHelper st (detectedMDs st)
drawMode EmailMode st = drawEmailHelper st
drawMode IndexMode st = drawIndexHelper st $ (selectedEmails st)
-- | Helper function of drawMode
drawMaildirHelper st [] = return $ st { curRow = 0 }
drawMaildirHelper st (md:mds) = do
moveCursor (curRow st) (colPadding st)
st' <- if (selectedRow st == curRow st)
then do
setColor $ selectedColorID st
drawString $ normalizeLen (scrColsAsInt st) md
setColor defaultColorID
return $ st { selectedMD = md }
else do
drawString $ normalizeLen (scrColsAsInt st) md
return st
let limit = if showStatus st' then (scrRows st') - 1 else scrRows st'
if curRow st' < limit
then drawMaildirHelper (incCurRow st') mds
else return $ st' { curRow = 0 }
-- | Helper function of drawMode
drawIndexHelper st [] = return $ st { curRow = 0 } --moveCursor 0 0 >> return st
drawIndexHelper st ((fp, _, msg):ts) = do
moveCursor (curRow st) (colPadding st)
let email = parseEmail msg
let fs = getFields email
let str = normalizeLen (scrColsAsInt st) . concat $
[ show $ (curRow st) + 1
, (ppSep ++) $ ppFlags . getFlags $ fp
, (ppSep ++) $ ppIndexNameAddr . getFrom $ fs
, (ppSep ++) $ ppIndexSubject . getSubject $ fs
]
st' <- if (selectedRow st == curRow st)
then do
setColor $ selectedColorID st
drawString str
setColor defaultColorID
return $ st { selectedEmail = email }
else do
drawString str
return st
if curRow st' < ((scrRows st') - 1)
then drawIndexHelper (incCurRow st') ts
else return $ st' { curRow = 0 }
-- | Helper function of drawMode
-- TODO: Make helpers functions to draw header and body in a separate way.
drawEmailHelper st = do
let fs = getFields $ selectedEmail st
let cropWith xs = normalizeLen $ (scrColsAsInt st) - (length xs)
let row = curRow st
moveCursor row (colPadding st)
drawString $ ("From: " ++) $ cropWith "From: " . ppNameAddr . getFrom $ fs
moveCursor (row + 1) (colPadding st)
drawString $ ("To: " ++) $ cropWith "To: " . ppNameAddr . getTo $ fs
moveCursor (row + 2) (colPadding st)
drawString $ ("Subject: " ++) $ cropWith "Subject: " . ppSubject . getSubject $ fs
let body = getBody $ selectedEmail st
drawBody (row + 4) (colPadding st) $ formatBody body (scrColsAsInt st)
return st
where drawBody _ _ [] = return ()
drawBody row col (xs:xss) = do
moveCursor row col
drawString xs
if row < (scrRows st) then drawBody (row + 1) col xss else return ()
-- | Empty the whole window. Useful when changing modes.
clearMain rows columns = do
drawEmptyLine 0
where
drawEmptyLine currentRow = do
moveCursor currentRow 0
drawString $ replicate (columns - 1) ' '
if currentRow < (rows - 1)
then drawEmptyLine $ currentRow + 1
else return ()
-- | Convert a String to multiple Strings, cropped by the maximum column
-- size if necessary.
formatBody :: String -> Int -> [String]
formatBody body maxColumns = format [] [] body where
format parsed acc [] = parsed ++ [acc]
format parsed acc ('\r':'\n':xs) = format (parsed ++ [acc]) [] xs
format parsed acc rest@(x:xs) | length acc < maxColumns = format parsed (acc ++ [x]) xs
| otherwise = format (parsed ++ [acc]) "+" rest
-- | Draw a status line with the current mode and other stuff
drawStatus st = do
moveCursor ((scrRows st) - 1) 0
setColor $ statusColorID st
drawString . normalizeLen (scrColsAsInt st) . concat $ drawStatusHelper (mode st) st
setColor defaultColorID
drawStatusHelper MaildirMode st = ["Maildir listing - "
, "(", show ((+ 1) . selectedRowMD $ st), "/"
, show (length $ detectedMDs st), ")"]
drawStatusHelper IndexMode st = ["mode: Index - "
, "(", show ((+ 1) . selectedRowIn $ st), "/"
, show (length $ selectedEmails st), ")"]
drawStatusHelper EmailMode st = ["mode: Email"]
-- | Handle an event
-- TODO: Handle the events in a cleaner way.
handleEvent :: MState -> Curses MState
handleEvent st = loop where
loop = do
w <- defaultWindow
ev <- getEvent w Nothing
case ev of
Nothing -> loop
Just ev' -> case ev' of
EventCharacter c | c == 'q' || c == 'Q' -> do
case (mode st) of
IndexMode -> return $ st { mode = MaildirMode }
EmailMode -> return $ st { mode = IndexMode }
MaildirMode -> return $ st { exitRequested = True }
EventSpecialKey KeyUpArrow -> return $ decSelectedRow st
EventCharacter 'k' -> return $ decSelectedRow st
EventSpecialKey KeyDownArrow -> return $ incSelectedRow st
EventCharacter 'j' -> return $ incSelectedRow st
EventSpecialKey KeyRightArrow -> do
case (mode st) of
IndexMode -> return $ st { mode = EmailMode }
EmailMode -> return st
MaildirMode -> do
selEmails <-liftIO $ getAll . selectedMD $ st
return $ st { mode = IndexMode, selectedEmails = selEmails }
_ -> loop
-}
|
