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|
{- Event handlers for Lazymail
-
- Copyright 2013 Raúl Benencia <rul@kalgan.cc>
-
- Licensed under the GNU GPL version 3 or higher
-}
module Handlers where
import Data.List(intercalate)
import Control.Monad.State
import Data.List(stripPrefix)
import System.FilePath(FilePath, takeFileName, dropTrailingPathSeparator)
import Email(parseEmail, getFields, getSubject, getFrom, getBody, formatBody)
import Maildir
import Print
import State
import qualified System.IO.UTF8 as UTF8
import Types (LazymailCurses)
previousMode :: Mode -> LazymailCurses ()
previousMode MaildirMode = (=<<) put $ get >>= \st -> return st { exitRequested = True }
previousMode EmailMode = (=<<) put $ get >>= \st -> return st { mode = IndexMode }
previousMode IndexMode = do
st <- get
let ist = (indexState st) { selectedRowIn = 0, scrollRowIn = 0 }
put $ st { mode = MaildirMode, indexState = ist }
changeMode :: Mode -> LazymailCurses ()
changeMode EmailMode = return ()
changeMode IndexMode = do
st <- get
msg <- liftIO $ UTF8.readFile . selectedEmailPath . indexState $ st
let email = parseEmail msg
let body = getBody $ email
let el = formatBody body $ screenColumns st
let est = (emailState st) { currentEmail = email, emailLines = el, scrollRowEm = 0 }
put $ st { mode = EmailMode, emailState = est }
changeMode MaildirMode = do
st <- get
selectedEmails' <- liftIO $ do
let md = (selectedMD . maildirState) $ st
emails <- getMaildirEmails md
formatIndexModeRows st emails
let indexState' = (indexState st) {
selectedEmails = selectedEmails'
, currentInLen = length selectedEmails'
, scrollBufferIn = scrollCrop (scrollRowIn . indexState $ st) (screenRows st) selectedEmails'
}
put $ st { mode = IndexMode, indexState = indexState' }
{- Boilerplate code -}
incSelectedRow IndexMode = do
st <- get
let inSt = indexState st
let selRow = selectedRowIn inSt
let topScrollRow = scrollRowIn inSt
let startScrolling = (div (screenRows st) 4) * 3
let totalRows = currentInLen inSt
if selRow > startScrolling && (topScrollRow <= (totalRows - (screenRows st)))
then do -- Scroll emails
let scrollRowIn' = scrollRowIn inSt + 1
let scrollBufferIn' = scrollCrop scrollRowIn' (screenRows st) $ selectedEmails inSt
let inSt' = inSt { scrollRowIn = scrollRowIn', scrollBufferIn = scrollBufferIn' }
put st { indexState = inSt' }
else -- Move the selected row
put $ incrementSelectedRow st
incSelectedRow MaildirMode = do
st <- get
let mdSt = maildirState st
let selRow = selectedRowMD mdSt
let topScrollRow = scrollRowMD mdSt
let startScrolling = (div (screenRows st) 4) * 3
let totalRows = length $ detectedMDs mdSt
if selRow > startScrolling && (topScrollRow <= (totalRows - (screenRows st)))
then do -- Scroll emails
let scrollRowMD' = topScrollRow + 1
let scrollBufferMD' = scrollCrop scrollRowMD' (screenRows st) $ detectedMDs mdSt
let mdSt' = mdSt { scrollRowMD = scrollRowMD', scrollBufferMD = scrollBufferMD' }
put st { maildirState = mdSt' }
else -- Move the selected row
put $ incrementSelectedRow st
incSelectedRow EmailMode = do
st <- get
let est = emailState st
let cur = scrollRowEm est
let scrRows = screenRows st
let totalRows = length $ emailLines est
let est' = est { scrollRowEm = (cur + 1) }
when ((totalRows - scrRows) > (scrollRowEm est)) $
put $ st { emailState = est' }
incSelectedRow _ = (=<<) put $ get >>= \st -> return $ incrementSelectedRow st
{- More boilerplate code -}
decSelectedRow IndexMode = do
st <- get
let inSt = indexState st
let selRow = selectedRowIn inSt
let startScrolling = (div (screenRows st) 4)
let topScrollRow = scrollRowIn inSt
if topScrollRow > 0 && selRow < startScrolling
then do
let scrollRowIn' = scrollRowIn inSt - 1
let scrollBufferIn' = scrollCrop scrollRowIn' (screenRows st) $ selectedEmails inSt
let inSt' = inSt { scrollRowIn = scrollRowIn', scrollBufferIn = scrollBufferIn' }
put st { indexState = inSt' }
else
put $ decrementSelectedRow st
decSelectedRow MaildirMode = do
st <- get
let mdSt = maildirState st
let selRow = selectedRowMD mdSt
let startScrolling = (div (screenRows st) 4)
let topScrollRow = scrollRowMD mdSt
if topScrollRow > 0 && selRow < startScrolling
then do
let scrollRowMD' = scrollRowMD mdSt - 1
let scrollBufferMD' = scrollCrop scrollRowMD' (screenRows st) $ detectedMDs mdSt
let mdSt' = mdSt { scrollRowMD = scrollRowMD', scrollBufferMD = scrollBufferMD' }
put st { maildirState = mdSt' }
else
put $ decrementSelectedRow st
decSelectedRow EmailMode = do
st <- get
let est = emailState st
let cur = scrollRowEm est
let scrRows = screenRows st
let totalRows = length $ emailLines est
let est' = est { scrollRowEm = (cur - 1) }
when ((totalRows - (scrRows + cur)) > 0) $
put $ st { emailState = est' }
decSelectedRow _ = (=<<) put $ get >>= \st -> return $ decrementSelectedRow st
{- Given a list, it returns the elements that will be in the next screen refresh
- TODO: find a better name -}
scrollCrop top rows xs = take rows $ drop top xs
formatIndexModeRows st = mapM formatRow where
formatRow fp = do
msg <- UTF8.readFile fp
let email = parseEmail msg
let fs = getFields email
let str = normalizeLen (screenColumns st) $ intercalate ppSep $
[ ppFlags . getFlags $ fp
, ppIndexNameAddr . getFrom $ fs
, ppSubject . getSubject $ fs
]
return (fp, str)
formatMaildirModeRows st = mapM formatRow where
formatRow fp = return $ (fp, (concat $ replicate (numPads - 1) pad) ++ name) where
bp = basePath st
str = case (stripPrefix bp fp) of
Nothing -> fp
Just s -> s
name' = takeFileName . dropTrailingPathSeparator $ str
name = takeFileName $ map (\x -> if x `elem` imapSep then '/' else x) name'
pad = " "
numPads = (length $ filter (== '/') str) + (length $ filter (`elem` imapSep) str)
imapSep = ['.'] -- IMAP usually separates its directories with dots
-- TODO: Improve this rancidness
mailHeaderLength = 4
|
