{-# LANGUAGE OverloadedStrings, CPP, ScopedTypeVariables #-} {- Copyright (C) 2012-2014 John MacFarlane This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -} {- | Module : Text.Pandoc.PDF Copyright : Copyright (C) 2012-2014 John MacFarlane License : GNU GPL, version 2 or above Maintainer : John MacFarlane Stability : alpha Portability : portable Conversion of LaTeX documents to PDF. -} module Text.Pandoc.PDF ( makePDF ) where import Data.ByteString.Lazy (ByteString) import qualified Data.ByteString.Lazy as B import qualified Data.ByteString.Lazy.Char8 as BC import qualified Data.ByteString as BS import System.Exit (ExitCode (..)) import System.FilePath import System.Directory import Data.Digest.Pure.SHA (showDigest, sha1) import System.Environment import Control.Monad (unless, (<=<)) import qualified Control.Exception as E import Control.Applicative ((<$)) import Data.List (isInfixOf) import Data.Maybe (fromMaybe) import qualified Text.Pandoc.UTF8 as UTF8 import Text.Pandoc.Definition import Text.Pandoc.Walk (walkM) import Text.Pandoc.Shared (fetchItem', warn, withTempDir) import Text.Pandoc.Options (WriterOptions(..)) import Text.Pandoc.MIME (extensionFromMimeType, getMimeType) import Text.Pandoc.Process (pipeProcess) import qualified Data.ByteString.Lazy as BL import qualified Codec.Picture as JP #ifdef _WINDOWS import Data.List (intercalate) #endif #ifdef _WINDOWS changePathSeparators :: FilePath -> FilePath changePathSeparators = intercalate "/" . splitDirectories #endif makePDF :: String -- ^ pdf creator (pdflatex, lualatex, xelatex) -> (WriterOptions -> Pandoc -> String) -- ^ writer -> WriterOptions -- ^ options -> Pandoc -- ^ document -> IO (Either ByteString ByteString) makePDF program writer opts doc = withTempDir "tex2pdf." $ \tmpdir -> do doc' <- handleImages opts tmpdir doc let source = writer opts doc' tex2pdf' tmpdir program source handleImages :: WriterOptions -> FilePath -- ^ temp dir to store images -> Pandoc -- ^ document -> IO Pandoc handleImages opts tmpdir = walkM (convertImages tmpdir) <=< walkM (handleImage' opts tmpdir) handleImage' :: WriterOptions -> FilePath -> Inline -> IO Inline handleImage' opts tmpdir (Image attr ils (src,tit)) = do exists <- doesFileExist src if exists then return $ Image attr ils (src,tit) else do res <- fetchItem' (writerMediaBag opts) (writerSourceURL opts) src case res of Right (contents, Just mime) -> do let ext = fromMaybe (takeExtension src) $ extensionFromMimeType mime let basename = showDigest $ sha1 $ BL.fromChunks [contents] let fname = tmpdir basename <.> ext BS.writeFile fname contents return $ Image attr ils (fname,tit) _ -> do warn $ "Could not find image `" ++ src ++ "', skipping..." return $ Image attr ils (src,tit) handleImage' _ _ x = return x convertImages :: FilePath -> Inline -> IO Inline convertImages tmpdir (Image attr ils (src, tit)) = do img <- convertImage tmpdir src newPath <- case img of Left e -> src <$ warn ("Unable to convert image `" ++ src ++ "':\n" ++ e) Right fp -> return fp return (Image attr ils (newPath, tit)) convertImages _ x = return x -- Convert formats which do not work well in pdf to png convertImage :: FilePath -> FilePath -> IO (Either String FilePath) convertImage tmpdir fname = case mime of Just "image/png" -> doNothing Just "image/jpeg" -> doNothing Just "application/pdf" -> doNothing _ -> JP.readImage fname >>= \res -> case res of Left msg -> return $ Left msg Right img -> E.catch (Right fileOut <$ JP.savePngImage fileOut img) $ \(e :: E.SomeException) -> return (Left (show e)) where fileOut = replaceDirectory (replaceExtension fname (".png")) tmpdir mime = getMimeType fname doNothing = return (Right fname) tex2pdf' :: FilePath -- ^ temp directory for output -> String -- ^ tex program -> String -- ^ tex source -> IO (Either ByteString ByteString) tex2pdf' tmpDir program source = do let numruns = if "\\tableofcontents" `isInfixOf` source then 3 -- to get page numbers else 2 -- 1 run won't give you PDF bookmarks (exit, log', mbPdf) <- runTeXProgram program numruns tmpDir source case (exit, mbPdf) of (ExitFailure _, _) -> do let logmsg = extractMsg log' let extramsg = case logmsg of x | "! Package inputenc Error" `BC.isPrefixOf` x -> "\nTry running pandoc with --latex-engine=xelatex." _ -> "" return $ Left $ logmsg <> extramsg (ExitSuccess, Nothing) -> return $ Left "" (ExitSuccess, Just pdf) -> return $ Right pdf (<>) :: ByteString -> ByteString -> ByteString (<>) = B.append -- parsing output extractMsg :: ByteString -> ByteString extractMsg log' = do let msg' = dropWhile (not . ("!" `BC.isPrefixOf`)) $ BC.lines log' let (msg'',rest) = break ("l." `BC.isPrefixOf`) msg' let lineno = take 1 rest if null msg' then log' else BC.unlines (msg'' ++ lineno) -- running tex programs -- Run a TeX program on an input bytestring and return (exit code, -- contents of stdout, contents of produced PDF if any). Rerun -- a fixed number of times to resolve references. runTeXProgram :: String -> Int -> FilePath -> String -> IO (ExitCode, ByteString, Maybe ByteString) runTeXProgram program runsLeft tmpDir source = do let file = tmpDir "input.tex" exists <- doesFileExist file unless exists $ UTF8.writeFile file source #ifdef _WINDOWS -- note: we want / even on Windows, for TexLive let tmpDir' = changePathSeparators tmpDir let file' = changePathSeparators file #else let tmpDir' = tmpDir let file' = file #endif let programArgs = ["-halt-on-error", "-interaction", "nonstopmode", "-output-directory", tmpDir', file'] env' <- getEnvironment let sep = searchPathSeparator:[] let texinputs = maybe (tmpDir' ++ sep) ((tmpDir' ++ sep) ++) $ lookup "TEXINPUTS" env' let env'' = ("TEXINPUTS", texinputs) : [(k,v) | (k,v) <- env', k /= "TEXINPUTS"] (exit, out, err) <- pipeProcess (Just env'') program programArgs BL.empty if runsLeft > 1 then runTeXProgram program (runsLeft - 1) tmpDir source else do let pdfFile = replaceDirectory (replaceExtension file ".pdf") tmpDir pdfExists <- doesFileExist pdfFile pdf <- if pdfExists -- We read PDF as a strict bytestring to make sure that the -- temp directory is removed on Windows. -- See https://github.com/jgm/pandoc/issues/1192. then (Just . B.fromChunks . (:[])) `fmap` BS.readFile pdfFile else return Nothing return (exit, out <> err, pdf)