Moved all code to src/

1 files changed, 232 insertions, 0 deletions

diff --git a/src/Lazymail/Handlers.hs b/src/Lazymail/Handlers.hs
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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 Lazymail.Handlers where
+
+import Codec.MIME.Parse(parseMIMEMessage)
+import Codec.MIME.Type(MIMEValue(..))
+import Control.Exception(evaluate)
+import Control.Monad.State
+import Data.List(intercalate, stripPrefix, sort)
+import System.FilePath(FilePath, takeFileName, dropTrailingPathSeparator)
+import System.IO(openFile, IOMode(..), hClose)
+import System.Locale(rfc822DateFormat)
+import Data.DateTime(parseDateTime, startOfTime, formatDateTime)
+import qualified System.IO.UTF8 as UTF8
+
+import Lazymail.Email(lookupField, getBody, formatBody)
+import Lazymail.Maildir
+import Lazymail.Print
+import Lazymail.State
+import Lazymail.Types
+
+previousMode :: Mode -> LazymailCurses ()
+previousMode MaildirMode = (=<<) put $ get >>= \st -> return st { exitRequested = True }
+previousMode EmailMode   = do
+  st <- get
+  if (triggerUpdateIn . indexState $ st)
+  then do
+    changeMode MaildirMode
+    solveIndexUpdate
+  else put $ 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
+  let fp = selectedEmailPath . indexState $ st
+  nfp <- if (isNew fp)
+         then liftIO $ markAsRead fp
+         else return fp
+  when (fp /= nfp) triggerIndexUpdate
+  st <- get
+  msg <- liftIO $ UTF8.readFile nfp
+  let email = parseMIMEMessage 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
+  unsortedEmails <- liftIO $ do
+    freeOldHandlers st
+    let md = (selectedMD . maildirState) $ st
+    emails <- getMaildirEmails md
+    mapM toEmail emails
+  let selectedEmails' = reverse $ sort unsortedEmails
+  let scrollRow = scrollRowIn . indexState $ st
+  let scrRows = screenRows st
+  let indexState' = (indexState st) {
+          selectedEmails = selectedEmails'
+        , currentInLen   = length selectedEmails'
+        , scrollBufferIn = formatIndexModeRows st $ scrollCrop scrollRow scrRows selectedEmails'
+        }
+  put $ st { mode = IndexMode, indexState = indexState' }
+
+  where
+    toEmail fp = do
+      handle <- openFile fp ReadMode
+      msg <- UTF8.hGetContents handle
+      let value = parseMIMEMessage msg
+      let headers = mime_val_headers value
+      let date = maybe startOfTime id $ parseDateTime rfc822DateFormat $ takeWhile (/= '(') $ lookupField "date" headers
+      return (Email value date fp handle)
+
+freeOldHandlers st = mapM (hClose . emailHandle) $ selectedEmails . indexState $ st
+
+{- 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' = formatIndexModeRows st $ 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
+
+{- Down-scrolling in Email mode -}
+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 + (bodyStartRow est) - 1) > (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' = formatIndexModeRows st $ 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 (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 :: LazymailState -> [Email] -> [(FilePath, String)]
+formatIndexModeRows st = map formatRow where
+  formatRow e = 
+    let fp = emailPath e
+        email = emailValue e
+        hs = mime_val_headers email
+        str = normalizeLen (screenColumns st) $ intercalate ppSep $
+              [ "[" ++ normalizeLen maxFlags (ppFlags . getFlags $ fp) ++ "]"
+              , formatDateTime "%b %d" $ emailDate e
+              , normalizeLen fromLen $ ppField $ lookupField "from" hs
+              , ppField $ lookupField "subject" hs
+              ]
+    in (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
+
+triggerIndexUpdate :: LazymailCurses ()
+triggerIndexUpdate = do
+  st <- get
+  let ist = indexState st
+  put $ st { indexState = (ist { triggerUpdateIn = True }) }
+  
+solveIndexUpdate :: LazymailCurses ()
+solveIndexUpdate = do
+  st <- get
+  let ist = indexState st
+  put $ st { indexState = (ist { triggerUpdateIn = False }) }  
+  
+triggerMaildirUpdate :: LazymailCurses ()
+triggerMaildirUpdate = do
+  st <- get
+  let mst = maildirState st
+  put $ st { maildirState = (mst { triggerUpdateMD = True }) }
+  
+solveMaildirUpdate :: LazymailCurses ()
+solveMaildirUpdate = do
+  st <- get
+  let mst = maildirState st
+  put $ st { maildirState = (mst { triggerUpdateMD = False }) }
+