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module Math
( compileMath
) where
import System.IO.Temp (withSystemTempDirectory)
import System.Process (callProcess)
import System.Directory (copyFile, getCurrentDirectory, setCurrentDirectory)
import System.FilePath (takeFileName, FilePath(..), (</>))
import Control.Monad
import Control.Exception (bracket)
import Control.DeepSeq (($!!))
compileMath :: String -> IO String
compileMath = withSystemTempDirectory "math" . compileMath'
compileMath' :: String -> FilePath -> IO String
compileMath' input tmpDir = do
mapM_ (copyToTmp . ("tex" </>)) [ "preamble.tex"
, "preview.dtx"
, "preview.ins"
]
withCurrentDirectory tmpDir $ do
callProcess "latex" [ "-interaction=batchmode"
, "preview.ins"
]
writeFile (tmpDir </> "image.tex") input
callProcess "latex" [ "-interaction=batchmode"
, "image.tex"
]
callProcess "dvisvgm" [ "--exact"
, "--no-fonts"
, tmpDir </> "image.dvi"
]
(\x -> return $!! x) =<< (readFile $ tmpDir </> "image.svg")
where
copyToTmp fp = copyFile fp (tmpDir </> takeFileName fp)
withCurrentDirectory :: FilePath -- ^ Directory to execute in
-> IO a -- ^ Action to be executed
-> IO a
withCurrentDirectory dir action =
bracket getCurrentDirectory setCurrentDirectory $ \ _ -> do
setCurrentDirectory dir
action
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