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|
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module MBox
(
-- TODO don't re-export MBox but use our own Message type
module Export
, getMessageId
, toForest
) where
import qualified Data.MBox as Export
import Control.Applicative
import qualified Data.CaseInsensitive as CI
import qualified Data.List as List
import Data.Map.Strict (Map)
import qualified Data.Map.Strict as Map
import Data.Maybe
import Data.MBox
import Data.Ord
import Data.Set (Set)
import qualified Data.Set as Set
import Data.Text.Lazy (Text)
import Data.Time
import Data.Tree (Tree, Forest)
import qualified Data.Tree as Tree
import qualified MappedSets
import qualified Data.Text.Lazy as Text
import Safe
import System.Locale
import qualified Text.ParserCombinators.Parsec.Rfc2822 as P
import qualified Text.ParserCombinators.Parsec as P
type Ident = Text
data IdentFields = IdentFields
{ messageId :: Ident
, inReplyTo :: [Ident]
, references :: [Ident]
}
deriving Show
toForest :: MBox -> Forest Message
toForest mbox =
map (sortTree . fmap (\i -> fromMaybe (error "meh") $ Map.lookup i msgs)) $
concatMap (Tree.subForest . mkSubTree) (Set.toList $ roots refs)
where
mkSubTree rootLabel =
Tree.Node rootLabel $
map mkSubTree (maybe [] Set.toList $ Map.lookup rootLabel backRefs)
refs = mboxRefs mbox
backRefs = MappedSets.invert refs
msgs = unpackMBox mbox
-- TODO finde a new home for roots
roots :: Ord a => Map a (Set a) -> Set a
roots refs =
Set.unions $ Map.elems $ Map.filter p refs
where
messageIDs = Set.fromList $ Map.keys refs
p = Set.null . Set.intersection messageIDs
-- TODO finde a new home for sortTree
sortTree :: Tree Message -> Tree Message
sortTree t =
Tree.Node (Tree.rootLabel t) $
map sortTree $
List.sortOn (getMessageDate . Tree.rootLabel) $
Tree.subForest t
getMessageDate :: Message -> Maybe UTCTime
getMessageDate msg =
parseTime defaultTimeLocale rfc822DateFormat =<<
Text.unpack . snd <$>
(lastMay $
filter ((==CI.mk "Date") . CI.mk . Text.unpack . fst) $
headers msg)
unpackMBox :: MBox -> Map Ident Message
unpackMBox =
Map.fromList .
map (\msg -> (getMessageId $ headers msg, msg))
getIdentFields :: Message -> IdentFields
getIdentFields m =
IdentFields
{ messageId = getMessageId hdrs
, inReplyTo = getInReplyTo hdrs
, references = getReferences hdrs
}
where
hdrs = headers m
-- TODO generate default Message-ID if not present
getMessageId :: [Header] -> Ident
getMessageId =
head .
headerMessageIds "Message-ID"
getInReplyTo :: [Header] -> [Ident]
getInReplyTo =
headerMessageIds "In-Reply-To"
getReferences :: [Header] -> [Ident]
getReferences =
headerMessageIds "References"
headerMessageIds :: P.SourceName -> [Header] -> [Ident]
headerMessageIds headerName =
concatMap (
either ((:[]) . Text.pack . show) id .
parseMsgIds headerName .
snd
) .
filter ((==CI.mk headerName) . CI.mk . Text.unpack . fst)
parseMsgIds :: P.SourceName -> Text -> Either P.ParseError [Ident]
parseMsgIds srcName =
fmap (map (Text.init . Text.tail . Text.pack)) .
P.parse obs_in_reply_to_parser srcName .
Text.unpack
where
--obs_in_reply_to_parser :: CharParser a [String]
obs_in_reply_to_parser =
--filter (not . null) <$> P.many (P.phrase >> return [] <|> P.msg_id)
P.many1 P.msg_id
messageRefs :: IdentFields -> [Ident]
messageRefs IdentFields{..} =
if null inReplyTo
then maybe [""] (:[]) (lastMay references)
else inReplyTo
mboxRefs :: MBox -> Map Ident (Set Ident)
mboxRefs =
MappedSets.mk .
map (\m ->
let x = getIdentFields m
in (messageId x, messageRefs x))
|
