39 lines
1.2 KiB
Haskell
39 lines
1.2 KiB
Haskell
import qualified Data.ByteString.Char8 as BS (readFile)
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import qualified Data.Map as Map (toList)
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import qualified Data.Text.IO as Text (putStrLn)
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import PDF (Document(..), parseDocument)
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import PDF.Object (Content)
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import PDF.Pages (Page(..), get, getAll)
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import PDF.Update (unify)
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import System.Environment (getArgs)
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import System.Exit (die)
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import System.IO (BufferMode(..), hSetBuffering, stdout)
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onDoc :: FilePath -> (Content -> Either String a) -> IO a
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onDoc inputFile f = do
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content <- fmap (unify . updates) . parseDocument <$> BS.readFile inputFile
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case content >>= f of
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Left someError -> die someError
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Right value -> return value
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displayPage :: Page -> IO ()
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displayPage = mapM_ Text.putStrLn . contents
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wholeDoc :: FilePath -> IO ()
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wholeDoc inputFile = do
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pages <- onDoc inputFile getAll
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mapM_ (displayPage . snd) $ Map.toList pages
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singlePage :: FilePath -> Int -> IO ()
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singlePage inputFile pageNumber =
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onDoc inputFile (`get` pageNumber) >>= displayPage
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main :: IO ()
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main = do
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hSetBuffering stdout LineBuffering
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args <- getArgs
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case args of
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[inputFile] -> wholeDoc inputFile
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[inputFile, pageNumber] -> singlePage inputFile (read pageNumber)
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_ -> die "Syntax: getText INPUT_FILE [PAGE_NUMBER]"
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