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#!/usr/bin/env runhaskell
{-# LANGUAGE OverloadedStrings #-}
import Text.Pandoc.JSON
import Control.Monad
import Control.Applicative
import qualified Data.ByteString.Char8 as BS
import Crypto.Hash
import qualified System.IO as SIO
import System.IO.Strict hiding (writeFile, readFile)
import System.Directory
import System.FilePath
import Text.Printf
import qualified Data.Text
import Prelude
type TeX = String
type RawHTML = String
texToPath :: FilePath -> TeX -> FilePath
texToPath base s = base </> "tex" </> (show ( hash (BS.pack s) :: Digest SHA1))
texToSVGPath :: FilePath -> TeX -> FilePath
texToSVGPath b s = texToPath b s </> "image.svg"
texToAlignPath :: FilePath -> TeX -> FilePath
texToAlignPath b s = texToPath b s </> "vertical-align"
texToExprPath :: FilePath -> TeX -> FilePath
texToExprPath b s = texToPath b s </> "image.expr"
compileToSVG :: FilePath -> MathType -> TeX -> IO RawHTML
compileToSVG basepath t s = let tex = Data.Text.unpack $ Data.Text.strip $ Data.Text.pack s
path = texToPath basepath tex
svg_path = texToSVGPath basepath tex
svg_web_path = texToSVGPath "" tex
align_path = texToAlignPath basepath tex
expr_path = texToExprPath basepath tex
display DisplayMath = "\\displaystyle\n"
display InlineMath = ""
in do createDirectoryIfMissing True path
any (/= True) <$> mapM doesFileExist [svg_path, align_path, expr_path] >>= (flip when)
(do writeFile expr_path $ (display t) ++ tex
writeFile align_path "0")
alignment <- head.lines <$> readFile align_path
SIO.hPutStrLn SIO.stdout path
return $ printf "<object data=\"/%s\" type=\"image/svg+xml\" style=\"vertical-align:-%s\">%s</object>" svg_web_path alignment tex
texify :: [String] -> Inline -> IO Inline
texify [basepath] (Math t s) = do svg <- compileToSVG basepath t s
return $ Span ("", [classOf t], []) [RawInline (Format "html") svg]
where classOf DisplayMath = "display-math"
classOf InlineMath = "inline-math"
texify [_] x = return x
main :: IO ()
main = toJSONFilter texify
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