52 lines
1.6 KiB
Haskell
52 lines
1.6 KiB
Haskell
{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeApplications #-}
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module Main where
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import Control.Monad.State (execState, execStateT)
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import Data.ByteString.Char8 (ByteString)
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import qualified Data.ByteString.Char8 as BS (readFile, split, intercalate)
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import qualified Data.ByteString.Lazy.Char8 as Lazy (writeFile)
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import PDF (Layers(..), Document(..), UnifiedLayers(..), parseDocument, render)
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import PDF.Box (Index(..), Maybe_(..), at, atAll, edit)
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import PDF.Layer (Layer, Objects(..))
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import PDF.Object.Navigation (StreamContent(..))
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import PDF.TextRendering (TextRendering(..), update)
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import Prelude hiding (lines, unlines)
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import System.Environment (getArgs)
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import System.IO (hPutStrLn, stderr)
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revealText :: ByteString -> ByteString
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revealText = unlines . fmap fill . lines
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where
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lines = BS.split '\n'
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fill = update $ const Fill
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unlines = BS.intercalate "\n"
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revealLayer :: Monad m => Layer -> m Layer
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revealLayer =
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atAll Objects
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.atAll (Maybe_ StreamContent) $
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return . revealText
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reveal :: Document -> Document
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reveal = execState $
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edit .at UnifiedLayers $ revealLayer
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revealFirst :: Document -> Document
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revealFirst document = maybe document id $ execStateT (
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edit .at Layers .at(Index 0) $ revealLayer
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) document
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deepReveal :: Document -> Document
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deepReveal = execState $
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edit .atAll Layers $ revealLayer
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main :: IO ()
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main = do
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[inputPath, outputPath] <- getArgs
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result <- parseDocument <$> BS.readFile inputPath
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case result of
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Left parseError -> hPutStrLn stderr $ show parseError
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Right doc -> Lazy.writeFile outputPath . render $ reveal doc
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