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{-# LANGUAGE OverloadedStrings, CPP #-}
{-
Copyright (C) 2012-2014 John MacFarlane <jgm@berkeley.edu>
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 <jgm@berkeley.edu>
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 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 ils (src,tit)) = do
exists <- doesFileExist src
if exists
then return $ Image 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 ils (fname,tit)
_ -> do
warn $ "Could not find image `" ++ src ++ "', skipping..."
return $ Image ils (src,tit)
handleImage' _ _ x = return x
convertImages :: FilePath -> Inline -> IO Inline
convertImages tmpdir (Image ils (src, tit)) = do
img <- convertImage tmpdir src
newPath <-
case img of
Left _ -> src <$ (warn $ "Unable to convert image `" ++ src ++ "'")
Right (fp, action) -> fp <$ action
return (Image 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, IO ())))
convertImage tmpdir fname =
case mime of
Just "image/png" -> doNothing
Just "image/jpeg" -> doNothing
Just "application/pdf" -> doNothing
_ -> savePng <$> JP.readImage fname
where
fileOut = replaceDirectory (replaceExtension fname (".png")) tmpdir
savePng = fmap (\x -> (fileOut, JP.savePngImage fileOut x))
mime = getMimeType fname
doNothing = return (Right $ (fname, return ()))
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)
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