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{-# LANGUAGE OverloadedStrings, CPP #-}
{-
Copyright (C) 2012 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 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 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 System.Environment
import Control.Monad (unless)
import Data.List (isInfixOf)
import qualified Data.ByteString.Base64 as B64
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Pandoc.Definition
import Text.Pandoc.Generic (bottomUpM)
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
withTempDir :: String -> (FilePath -> IO a) -> IO a
withTempDir =
#ifdef _WINDOWS
withTempDirectory "."
#else
withSystemTempDirectory
#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 (writerSourceDirectory opts) tmpdir doc
let source = writer opts doc'
tex2pdf' tmpdir program source
handleImages :: String -- ^ source directory/base URL
-> FilePath -- ^ temp dir to store images
-> Pandoc -- ^ document
-> IO Pandoc
handleImages baseURL tmpdir = bottomUpM (handleImage' baseURL tmpdir)
handleImage' :: 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 = maybe (takeExtension src) id $
extensionFromMimeType mime
let basename = UTF8.toString $ B64.encode $ UTF8.fromString src
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
let msg = "Error producing PDF from TeX source."
case (exit, mbPdf) of
(ExitFailure _, _) -> return $ Left $
msg <> "\n" <> extractMsg log'
(ExitSuccess, Nothing) -> return $ Left msg
(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
let programArgs = ["-halt-on-error", "-interaction", "nonstopmode",
"-output-directory", tmpDir, file]
env' <- getEnvironment
let texinputs = maybe (tmpDir ++ ":") ((tmpDir ++ ":") ++)
$ 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
then Just `fmap` B.readFile pdfFile
else return Nothing
return (exit, out <> err, pdf)
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