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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 LazymailUpdate = ReaderT LazymailConfig (StateT LazymailState Update)
type LazymailCurses = ReaderT LazymailConfig (StateT LazymailState Curses)
liftCurses = lift . lift
liftUpdate = lift . lift
entryPoint :: Lazymail ()
entryPoint = do
st <- get
maildirs <- liftIO $ getMaildirsRecursively $ basePath st
let mdState = (maildirState st) { detectedMDs = maildirs }
cfg <- ask
liftIO $ runCurses $ runStateT (runReaderT startCurses cfg) (st { maildirState = mdState })
return ()
startCurses :: LazymailCurses ()
startCurses = do
st <- get
cfg <- ask
(=<<) put $ liftCurses $ do
UI.setEcho False
(rows, cols) <- UI.screenSize
basColID <- newColorID (fst . baseColor $ cfg) (snd . baseColor $ cfg) 1
selColID <- newColorID (fst . selectionColor $ cfg) (snd . selectionColor $ cfg) 2
staColID <- newColorID (fst . statusBarColor $ cfg) (snd . statusBarColor $ cfg) 3
let style = ColorStyle basColID selColID staColID
return $ st { screenRows = fromIntegral rows
, screenColumns = fromIntegral cols
, colorStyle = style }
screenLoop
{- This function will loop til the user decides to leave -}
screenLoop :: LazymailCurses ()
screenLoop = do
w <- liftCurses $ defaultWindow
st <- get
cfg <- ask
liftCurses $ updateWindow w $ do runStateT (runReaderT performUpdate cfg) st
liftCurses $ render
handleEvent
st <- get
if (not . exitRequested) st
then screenLoop
else return ()
performUpdate :: LazymailUpdate ()
performUpdate = do
st <- get
liftUpdate $ clearMain (scrRowsAsInteger st) (screenColumns st)
drawMode (mode st)
drawStatus
-- | Pattern match on the received mode and draw it in the screen.
drawMode :: Mode -> LazymailUpdate ()
drawMode MaildirMode = do
st <- get
let mdState = maildirState st
drawMaildirHelper $ detectedMDs mdState
--drawMode EmailMode = drawEmailHelper
--drawMode IndexMode = drawIndexHelper (selectedEmails st)
-- | Helper function of drawMode
drawMaildirHelper :: [FilePath] -> LazymailUpdate ()
drawMaildirHelper [] = resetCurrentRow
drawMaildirHelper (md:mds) = do
st <- get
(=<<) put $ liftUpdate $ do
moveCursor (curRowAsInteger st) (colPadAsInteger st)
if (selectedRow st == currentRow st)
then do
setColor $ selectionColorID . colorStyle $ st
drawString $ normalizeLen (screenColumns st) md
setColor $ baseColorID . colorStyle $ st
let mdState = (maildirState st) { selectedMD = md }
return $ st { maildirState = mdState }
else do
drawString $ normalizeLen (screenColumns st) md
return st
st <- get
let limit = if statusBar st then (screenRows st) - 1 else screenRows st
if currentRow st < limit
then do
put st { currentRow = (currentRow st) + 1 }
drawMaildirHelper mds
else
resetCurrentRow
-- | 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 ()
{-
-- | 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 ()
-- | 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 = do
st <- get
liftUpdate $ do
moveCursor ((scrRowsAsInteger st) - 2) 0
setColor $ statusBarColorID . colorStyle $ st
drawString . normalizeLen (screenColumns st) . concat $ drawStatusHelper (mode st) st
setColor $ baseColorID . colorStyle $ st
drawStatusHelper MaildirMode st = ["Maildir listing - "
, "(", show ((+ 1) . selectedRow $ st), "/"
, show (length $ detectedMDs . maildirState $ st), ")"]
drawStatusHelper IndexMode st = ["mode: Index - "]
-- , "(", show ((+ 1) . selectedRow $ st), "/"
-- , show (length $ selectedEmails . indexState $ st), ")"]
drawStatusHelper EmailMode st = ["mode: Email"]
-- | Handle an event
-- TODO: Handle the events in a cleaner way.
handleEvent :: LazymailCurses ()
handleEvent = loop where
loop = do
w <- liftCurses $ defaultWindow
ev <- liftCurses $ getEvent w Nothing
st <- get
case ev of
Nothing -> loop
Just ev' -> case ev' of
EventCharacter c | c == 'q' || c == 'Q' -> do
case (mode st) of
IndexMode -> put $ st { mode = MaildirMode }
EmailMode -> put $ st { mode = IndexMode }
MaildirMode -> put $ st { exitRequested = True }
{- EventSpecialKey KeyUpArrow -> put $ decSelectedRow st
EventCharacter 'k' -> put $ decSelectedRow st
EventSpecialKey KeyDownArrow -> put $ incSelectedRow st
EventCharacter 'j' -> put $ incSelectedRow st
EventSpecialKey KeyRightArrow -> do
case (mode st) of
IndexMode -> put $ st { mode = EmailMode }
EmailMode -> return ()
MaildirMode -> do
selEmails <- liftIO $ getAll . selectedMD $ st
return $ st { mode = IndexMode, selectedEmails = selEmails } -}
_ -> loop
resetCurrentRow = (=<<) put $ get >>= \st -> return $ st { currentRow = 0 }
|
