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{-# LANGUAGE OverloadedStrings #-}
import Text.Read
import Control.Monad.State
import Control.Monad
import Text.Pandoc
import Data.Monoid
import Control.Applicative
import Text.Pandoc.JSON
import Text.Pandoc.Walk
slice :: Int -> Int -> [a] -> [a]
slice from to xs = take (to - from + 1) (drop from xs)
doSlice :: Block -> IO Block
doSlice cb@(CodeBlock (id, classes, namevals) contents) = do
res <- return $ do
upper <- readMaybe =<< lookup "upper" namevals
lower <- readMaybe =<< lookup "lower" namevals
file <- lookup "slice" namevals
return (upper, lower, file)
case res of
Nothing -> return cb
Just (upper, lower, f) -> do
contents <- readFile f
let lns = unlines $ slice lower upper (lines contents)
return (CodeBlock (id, classes, namevals) lns)
doSlice x = return x
doInclude :: Block -> IO Block
doInclude cb@(CodeBlock (id, classes, namevals) contents) =
case lookup "include" namevals of
Just f -> return . (CodeBlock (id, classes, namevals)) =<< readFile f
Nothing -> return cb
doInclude x = return x
doHtml :: Block -> IO Block
doHtml cb@(CodeBlock (id, classes, namevals) contents) =
case lookup "literal" namevals of
Just f -> return . (RawBlock "html") =<< readFile f
Nothing -> return cb
doHtml x = return x
injectLatexMacros :: Maybe Format -> Pandoc -> IO Pandoc
injectLatexMacros (Just fmt) p = do
macros <- readFile "latex_macros"
let block =
case fmt of
Format "html" ->
Div ("",[],[("style","display:none")]) . (:[])
. Para . (:[]) . Math DisplayMath $ macros
Format "latex" -> RawBlock "latex" macros
Format "epub" -> RawBlock "latex" macros
_ -> RawBlock "latex" macros
return (Pandoc nullMeta [block] <> p)
injectLatexMacros _ _ = return mempty
main :: IO ()
main = toJSONFilter
((\fmt -> injectLatexMacros fmt
>=> walkM doInclude
>=> walkM doSlice
>=> walkM doHtml) :: Maybe Format -> Pandoc -> IO Pandoc)
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