{-# LANGUAGE OverloadedStrings, CPP #-} {- 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 System.IO.Temp 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 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) import Text.Pandoc.Options (WriterOptions(..)) import Text.Pandoc.MIME (extensionFromMimeType) import Text.Pandoc.Process (pipeProcess) import qualified Data.ByteString.Lazy as BL #ifdef _WINDOWS import Data.List (intercalate) #endif withTempDir :: String -> (FilePath -> IO a) -> IO a withTempDir = #ifdef _WINDOWS withTempDirectory "." #else withSystemTempDirectory #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 (writerSourceURL opts) tmpdir doc let source = writer opts doc' tex2pdf' tmpdir program source handleImages :: Maybe String -- ^ source base URL -> FilePath -- ^ temp dir to store images -> Pandoc -- ^ document -> IO Pandoc handleImages baseURL tmpdir = walkM (handleImage' baseURL tmpdir) handleImage' :: Maybe String -> FilePath -> Inline -> IO Inline handleImage' baseURL tmpdir (Image ils (src,tit)) = do exists <- doesFileExist src if exists then return $ Image ils (src,tit) else do res <- fetchItem baseURL 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 ils (fname,tit) _ -> do warn $ "Could not find image `" ++ src ++ "', skipping..." return $ Image ils (src,tit) handleImage' _ _ x = return x 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)