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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE TemplateHaskell #-}
module Thermoprint.Server.Printer.Generic
( genericPrint
) where
import Thermoprint.Printout
import Thermoprint.API (PrintingError(..))
import Thermoprint.Server.Printer
import System.FileLock
import System.IO
import Data.Sequence (Seq, (|>), (<|), ViewL(..), viewl, ViewR(..), viewr)
import qualified Data.Sequence as Seq
import qualified Data.ByteString.Lazy as Lazy (ByteString)
import qualified Data.ByteString.Lazy as LBS
import qualified Data.ByteString.Lazy.Char8 as CLBS
import qualified Data.Text.Lazy as Lazy (Text)
import qualified Data.Text.Lazy as TL
import qualified Data.Text as T
import Data.Encoding
import Data.Encoding.CP437
import Data.Binary.Put
import Data.Word
import Control.Monad
import Control.Monad.Reader
import Control.Monad.Trans.State
import Control.Monad.Logger
import Control.Monad.IO.Class
import Control.Monad.Trans.Resource
import Data.Acquire
import Control.Exception.Base (IOException)
import Control.Monad.Catch
import Data.Foldable
import Data.List (genericReplicate, genericLength, intercalate)
import Data.Monoid
import Data.Int (Int64)
import Control.Concurrent (threadDelay)
import Prelude hiding (mapM_, sequence_, lines)
genericPrint :: FilePath -> PrinterMethod
genericPrint path = PM $ genericPrint' path
genericPrint' :: (MonadIO m, MonadMask m, MonadLogger m) => FilePath -> Printout -> m (Maybe PrintingError)
genericPrint' path = flip catches handlers . withFile path . print
where
withFile path f = flip withEx f $ mkAcquire (openFile path WriteMode >>= (\h -> h <$ hSetBuffering h NoBuffering)) hClose
handlers = [ Handler $ return . Just . IOError . (show :: IOException -> String)
, Handler $ return . Just . EncError
, Handler $ return . Just
]
print printout handle = $(logDebug) (T.pack $ show printout') >> liftIO (slowPut handle printout' >> return Nothing)
where
printout' = runPut $ initialize >> render printout >> finalize
slowPut :: Handle -> Lazy.ByteString -> IO ()
slowPut h = slowPut' . LBS.split (LBS.last newl)
where
slowPut' [] = return ()
slowPut' [t] = LBS.hPutStr h t
slowPut' (x:xs) = slowPut' [x] >> LBS.hPutStr h (LBS.singleton $ LBS.last newl) >> threadDelay (50 * 10^3) >> slowPut' xs
encode' :: ByteSink m => String -> m ()
encode' = encode CP437
width :: Integer
width = 32
esc :: Word8
esc = 27
escSequence :: [Word8] -> Put
escSequence = mapM_ pushWord8 . (esc:)
initialize :: Put
initialize = replicateM_ 2 $ escSequence [64]
newl :: Lazy.ByteString
newl = encodeLazyByteString CP437 "\n"
newls :: Integer -> Lazy.ByteString
newls i = mconcat $ genericReplicate i newl
newls' :: Integer -> Put
newls' = mapM_ pushWord8 . LBS.unpack . newls
finalize :: Put
finalize = newls' 3 >> encode' " " >> newls' 1
intersperse :: b -> (a -> b) -> Seq a -> Seq b
intersperse _ _ (viewl -> EmptyL) = Seq.empty
intersperse _ f (viewl -> x :< (viewl -> EmptyL)) = Seq.singleton $ f x
intersperse b f (viewl -> x :< xs) = f x <| b <| intersperse b f xs
intersperse' :: Monad m => m b -> (a -> m b) -> Seq a -> m ()
intersperse' b f = sequence_ . intersperse b f
render :: Printout -> Put
render = intersperse' (newls' 2) renderPar
renderPar :: Paragraph -> Put
renderPar = mapM_ renderChunk
where
renderChunk (Raw bs) = mapM_ pushWord8 $ LBS.unpack bs
renderChunk (Cooked block) = renderDoc $ execState (renderBlock block) (initDoc width)
data Doc = Doc
{ lines :: Seq Put
, currentLine :: Put
, space :: Integer
, remainingSpace :: Integer
, overflows :: Integer
}
initDoc :: Integer -> Doc
initDoc space = Doc { lines = Seq.empty
, currentLine = return ()
, space = space
, remainingSpace = space
, overflows = 0
}
breakLine :: Doc -> Doc
breakLine doc@(Doc{..}) = doc { remainingSpace = space
, lines = lines |> currentLine
, currentLine = return ()
}
renderDoc :: Doc -> Put
renderDoc Doc{..} = intersperse' (newls' 1) id lines'
where
lines'
| remainingSpace == space = lines
| otherwise = lines |> currentLine
renderBlock :: Block -> State Doc ()
renderBlock (VSpace n) = sequence_ . genericReplicate n $ modify' breakLine
renderBlock (NewlSep xs) = intersperse' (modify' breakLine) renderBlock xs
renderBlock (Line x) = renderLine x
renderLine :: Line -> State Doc ()
renderLine (HSpace n) = modify' insertSpace
where
insertSpace doc@(Doc{..})
| remainingSpace > n = doc { remainingSpace = remainingSpace - n
, currentLine = currentLine >> (sequence_ $ genericReplicate n $ encode' " ")
}
| remainingSpace == n = breakLine doc
| otherwise = breakLine $ doc { overflows = overflows + 1 }
renderLine (JuxtaPos xs) = mapM_ renderLine xs
renderLine (cotext . Line -> word) = modify' $ insertWord
where
insertWord doc
| TL.null wordTail = checkBreak $ doc'
| otherwise = checkBreak $ doc { remainingSpace = space doc - (word' `mod` space doc)
, lines = (lines doc |> currentLine doc) <> cs
, currentLine = c
, overflows = overflows doc + (toInteger $ Seq.length cs)
}
where
(wordInit, wordTail) = TL.splitAt (fromInteger $ remainingSpace doc) word
word' = toInteger $ TL.length word
wordInit' = toInteger $ TL.length wordInit
wordTail' = toInteger $ TL.length wordTail
doc' = insertInit doc
insertInit doc@(Doc{..}) = doc { remainingSpace = remainingSpace - wordInit'
, currentLine = currentLine >> encode'' wordInit
}
(cs :> c) = viewr . Seq.fromList . map encode'' $ TL.chunksOf (fromInteger $ space doc) word
checkBreak doc@(Doc{..})
| remainingSpace == 0 = doc { remainingSpace = space
, lines = lines |> currentLine
, currentLine = return ()
}
| otherwise = doc
encode'' = encode' . TL.unpack
|
