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|
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE OverloadedStrings #-}
module Notmuch where
import qualified Data.ByteString.Lazy as LBS
import qualified Data.ByteString.Lazy.Char8 as LBS8
import Control.Concurrent
import Control.DeepSeq (rnf)
import Control.Exception
import Data.Aeson
import Data.Monoid
import Data.Tree
import Notmuch.Message
import Notmuch.SearchResult
import System.Exit
import System.IO
import System.Process
-- | Fork a thread while doing something else, but kill it if there's an
-- exception.
--
-- This is important in the cases above because we want to kill the thread
-- that is holding the Handle lock, because when we clean up the process we
-- try to close that handle, which could otherwise deadlock.
--
withForkWait :: IO () -> (IO () -> IO a) -> IO a
withForkWait async body = do
waitVar <- newEmptyMVar :: IO (MVar (Either SomeException ()))
mask $ \restore -> do
tid <- forkIO $ try (restore async) >>= putMVar waitVar
let wait = takeMVar waitVar >>= either throwIO return
restore (body wait) `onException` killThread tid
notmuch :: [String] -> IO LBS.ByteString
notmuch args = do
(_, Just hout, _, ph) <- createProcess (proc "notmuch" args)
{ std_out = CreatePipe }
output <- LBS.hGetContents hout
withForkWait (evaluate $ rnf output) $ \waitOut -> do
---- now write any input
--unless (null input) $
-- ignoreSigPipe $ hPutStr inh input
-- hClose performs implicit hFlush, and thus may trigger a SIGPIPE
--ignoreSigPipe $ hClose inh
-- wait on the output
waitOut
hClose hout
-- wait on the process
_ex <- waitForProcess ph
--return (ex, output)
--case ex of
-- ExitSuccess -> return output
-- ExitFailure r -> processFailedException "readProcess" cmd args r
return output
notmuch' :: [String] -> IO (ExitCode, LBS.ByteString, LBS.ByteString)
notmuch' args = do
(_, Just hout, Just herr, ph) <-
createProcess (proc "notmuch" args)
{ std_out = CreatePipe
, std_err = CreatePipe
}
out <- LBS.hGetContents hout
err <- LBS.hGetContents herr
withForkWait (evaluate $ rnf out) $ \waitOut -> do
withForkWait (evaluate $ rnf err) $ \waitErr -> do
---- now write any input
--unless (null input) $
-- ignoreSigPipe $ hPutStr inh input
-- hClose performs implicit hFlush, and thus may trigger a SIGPIPE
--ignoreSigPipe $ hClose inh
-- wait on the output
waitOut
waitErr
hClose hout
hClose herr
-- wait on the process
exitCode <- waitForProcess ph
return (exitCode, out, err)
notmuchWithInput
:: [String]
-> LBS.ByteString
-> IO (ExitCode, LBS.ByteString, LBS.ByteString)
notmuchWithInput args input = do
(Just hin, Just hout, Just herr, ph) <-
createProcess (proc "notmuch" args)
{ std_in = CreatePipe
, std_out = CreatePipe
, std_err = CreatePipe
}
LBS.hPut hin input
hClose hin
out <- LBS.hGetContents hout
err <- LBS.hGetContents herr
withForkWait (evaluate $ rnf out) $ \waitOut -> do
withForkWait (evaluate $ rnf err) $ \waitErr -> do
---- now write any input
--unless (null input) $
-- ignoreSigPipe $ hPutStr inh input
-- hClose performs implicit hFlush, and thus may trigger a SIGPIPE
--ignoreSigPipe $ hClose inh
-- wait on the output
waitOut
waitErr
hClose hout
hClose herr
-- wait on the process
exitCode <- waitForProcess ph
return (exitCode, out, err)
search :: String -> IO (Either String [SearchResult])
search term =
notmuch [ "search", "--format=json", "--format-version=2", term ]
>>= return . eitherDecode'
data ReplyTo = ToAll | ToSender
instance Show ReplyTo where
show ToAll = "all"
show ToSender = "sender"
--notmuchReply :: String -> IO (Either String [SearchResult])
notmuchReply :: ReplyTo -> String -> IO LBS.ByteString
notmuchReply replyTo term =
notmuch
[ "reply"
, "--reply-to=" ++ show replyTo
, term
]
-- >>= return . eitherDecode'
notmuchShow :: String -> IO (Forest Message)
notmuchShow term = do
c' <- notmuch [ "show", "--format=json", "--format-version=2"
, term ]
-- TODO why head?
return $ threadForest $ head $
either error id (eitherDecode' c')
notmuchShowPart :: String -> Int -> IO (Either String MessagePart)
notmuchShowPart term partId = do
-- TODO handle partId == 0 and partId > N
(exitCode, out, err) <-
notmuch' [ "show", "--format=json", "--format-version=2"
, "--part=" <> show partId
, term ]
return $ case exitCode of
ExitSuccess -> eitherDecode' out
_ -> Left $ show exitCode <> ": " <> LBS8.unpack err
setTag :: String -> String -> IO LBS.ByteString
setTag tag i = do
notmuch [ "tag", "+" <> tag , "id:" <> i ]
unsetTag :: String -> String -> IO LBS.ByteString
unsetTag tag i = do
notmuch [ "tag", "-" <> tag , "id:" <> i ]
|
