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|
{- Lazymail interaction with curses.
-
- Copyright 2013 Raúl Benencia <rul@kalgan.cc>
-
- Licensed under the GNU GPL version 3 or higher
-
- This code is in an urgent need of a big refactoring.
-}
module Screen where
import Control.Monad.Trans(liftIO)
import Control.Monad.Reader
import Control.Monad.State
import Data.List(isPrefixOf)
import System.Exit
import Text.ParserCombinators.Parsec.Rfc2822(Message(..))
import UI.NCurses
-- Local imports
import Config
import qualified Handlers as EH
import Lazymail
import Maildir
import Email
import Print
import Rfc1342
import State
import Types(LazymailCurses, LazymailUpdate)
{- This function is the nexus between Curses and IO -}
entryPoint :: Lazymail ()
entryPoint = do
st <- get
cfg <- ask
maildirs <- liftIO $ do
mds <- getMaildirsRecursively $ basePath st
(filterMaildirsHook cfg) mds
formattedMDs <- EH.formatMaildirModeRows st maildirs
let mdState = (maildirState st) { detectedMDs = formattedMDs }
liftIO $ runCurses $ runStateT (runReaderT startCurses cfg) (st { maildirState = mdState })
return ()
{- Initial point of screen related functions. Get the number of rows,
- colors, and start drawing the modes -}
startCurses :: LazymailCurses ()
startCurses = do
st <- get
cfg <- ask
(=<<) put $ liftCurses $ do
setEcho False
(rows, cols) <- 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
heaColID <- newColorID (fst . headerColor $ cfg) (snd . headerColor $ cfg) 3
let style = ColorStyle defaultColorID selColID staColID heaColID
return $ st { screenRows = fromIntegral $ rows - 1
, screenColumns = fromIntegral $ cols
, colorStyle = style }
resetScrollBuffer
screenLoop
{- This function will loop til the user decides to leave -}
screenLoop :: LazymailCurses ()
screenLoop = do
w <- liftCurses $ defaultWindow
cfg <- ask
get >>= \st ->
(liftCurses . (updateWindow w) $ runStateT (runReaderT performUpdate cfg) st) >>= put . snd
liftCurses $ render
handleEvent
get >>= \st -> if (not . exitRequested) st
then screenLoop
else return ()
{- Perform the screen update, by cleaning it first. -}
performUpdate :: LazymailUpdate LazymailState
performUpdate = do
st <- get
liftUpdate $ clearMain (scrRowsAsInteger st) (screenColumns st)
drawMode (mode st)
drawStatus
get
{- Pattern match on the received mode and draw it in the screen. -}
drawMode :: Mode -> LazymailUpdate ()
drawMode MaildirMode = get >>= \st -> drawSelectionList $ scrollBufferMD . maildirState $ st
drawMode IndexMode = get >>= \st -> drawSelectionList $ scrollBufferIn . indexState $ st
drawMode EmailMode = drawEmailHelper
{- Draw a scrollable selection list -}
drawSelectionList [] = resetCurrentRow
drawSelectionList ((path, str):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) str
setColor $ baseColorID . colorStyle $ st
case (mode st) of
MaildirMode -> do
let mst = (maildirState st) { selectedMD = path }
return $ st { maildirState = mst }
IndexMode -> do
let ist = (indexState st) { selectedEmailPath = path }
return $ st { indexState = ist }
else do
drawString $ normalizeLen (screenColumns st) str
return st
st <- get
let limit = if statusBar st then (screenRows st) - 1 else screenRows st
if currentRow st < limit
then do
incrementCurrentRow
drawSelectionList 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) ' '
when (currentRow < rows - 1) $ drawEmptyLine $ currentRow + 1
{- Helper function of drawMode -}
drawEmailHelper = do
drawEmailHeader
st <- get
let est = emailState st
let body = getBody $ currentEmail . emailState $ st
let maxRows = if statusBar st then (scrRowsAsInteger st) - 1 else scrRowsAsInteger st
liftUpdate $
drawBody (curRowAsInteger st) (colPadAsInteger st) maxRows $
drop (scrollRowEm est) $ emailLines est
resetCurrentRow
{- Draw the email headers -}
drawEmailHeader = do
st <- get
liftUpdate $ do
let fs = getFields $ currentEmail . emailState $ st
let cropWith xs = normalizeLen $ (screenColumns st) - (length xs)
let row = curRowAsInteger st
setColor $ headerColorID . colorStyle $ st
moveCursor row (colPadAsInteger st)
drawCroppedString st $ ("From: " ++) $ ppNameAddr . getFrom $ fs
moveCursor (row + 1) (colPadAsInteger st)
drawCroppedString st $ ("To: " ++) $ ppNameAddr . getTo $ fs
moveCursor (row + 2) (colPadAsInteger st)
drawCroppedString st $ ("Subject: " ++) $ ppSubject . getSubject $ fs
setColor $ baseColorID . colorStyle $ st
put $ st { currentRow = (4 + currentRow st) }
{- Draw the email body -}
drawBody _ _ _ [] = return ()
drawBody row col maxRows (xs:xss) = do
moveCursor row col
drawString xs
when (row < maxRows) $ drawBody (row + 1) col maxRows xss
{- Draw a status line with the current mode and other stuff -}
drawStatus = do
st <- get
liftUpdate $ do
moveCursor ((scrRowsAsInteger st) - 1) 0
setColor $ statusBarColorID . colorStyle $ st
drawString . normalizeLen (screenColumns st) . concat $ drawStatusHelper (mode st) st
setColor $ baseColorID . colorStyle $ st
{- Status bar string for Maildir mode -}
drawStatusHelper MaildirMode st =
["Maildir listing - "
, "(", show ((selectedRow st) + (scrollRowMD . maildirState $ st) + 1), "/"
, show (length $ detectedMDs . maildirState $ st), ")"]
{- Status bar string for Index mode -}
drawStatusHelper IndexMode st =
["mode: Index - "
, "(", show ((selectedRow st) + (scrollRowIn . indexState $ st) + 1), "/"
, show (currentInLen . indexState $ st), ")"]
{- Status bar string for Email mode -}
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 'q' -> EH.previousMode (mode st)
EventSpecialKey KeyUpArrow -> EH.decSelectedRow (mode st)
EventCharacter 'k' -> EH.decSelectedRow (mode st)
EventSpecialKey KeyDownArrow -> EH.incSelectedRow (mode st)
EventCharacter 'j' -> EH.incSelectedRow (mode st)
EventSpecialKey KeyEnter -> EH.changeMode (mode st)
EventSpecialKey KeyRightArrow -> EH.changeMode (mode st)
_ -> loop
{- Reset the current row to the beginning -}
resetCurrentRow = (=<<) put $ get >>= \st -> return $ st { currentRow = 0 }
{- Advance the current row. Useful when drawing modes -}
incrementCurrentRow = (=<<) put $ get >>= \st -> return $ st { currentRow = (currentRow st) + 1 }
{- Put the scroll at the top -}
resetScrollBuffer = do
st <- get
case (mode st) of
MaildirMode -> do
let mst = (maildirState st) {
scrollBufferMD = EH.scrollCrop 0 (screenRows st) $ detectedMDs . maildirState $ st }
put st { maildirState = mst}
IndexMode -> do
let ist = (indexState st) {
scrollBufferIn = EH.scrollCrop 0 (screenRows st) $ selectedEmails . indexState $ st }
put st { indexState = ist }
drawCroppedString st str = drawString $ normalizeLen (screenColumns st) str
-- The type system complains if I want to use the same function for diferents monads
liftCurses = lift . lift
liftUpdate = lift . lift
|
