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{-# LANGUAGE ViewPatterns #-}
-- Parts of the code (specifically parts of `pairPositions' and `groupLiterate')
-- are taken from the Agda.Interaction.Highlighting.HTML module of Agda, see
-- <http://code.haskell.org/Agda/LICENSE> for the license and the copyright
-- information for that code.
module Hakyll.Web.Agda
( markdownAgda
, pandocAgdaCompilerWith
, pandocAgdaCompiler
) where
import Agda.Interaction.FindFile (findFile)
import Agda.Interaction.Highlighting.Precise
import qualified Agda.Interaction.Imports as Imp
import Agda.Interaction.Options
import Agda.Syntax.Abstract.Name (toTopLevelModuleName)
import Agda.Syntax.Common
import Agda.Syntax.Concrete.Name (TopLevelModuleName)
import Agda.TypeChecking.Errors
import Agda.TypeChecking.Monad (TCM)
import qualified Agda.TypeChecking.Monad as TCM
import Agda.Utils.FileName
import qualified Agda.Utils.IO.UTF8 as UTF8
import Control.Monad.Except (catchError, throwError)
import Control.Monad.IO.Class (liftIO)
import Data.Char (isSpace)
import Data.Function (on)
import qualified Data.IntMap as IntMap
import Data.List (groupBy, isInfixOf, isPrefixOf, tails)
import Data.Maybe (fromMaybe)
import Hakyll.Core.Compiler
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Web.Pandoc
import System.Directory (getCurrentDirectory, setCurrentDirectory, canonicalizePath, setCurrentDirectory)
import System.Exit (exitFailure)
import System.FilePath (dropFileName, splitExtension)
import Text.Pandoc (readMarkdown, ReaderOptions, WriterOptions)
import Text.XHtml.Strict
checkFile :: AbsolutePath -> TCM TopLevelModuleName
checkFile file = do
TCM.resetState
toTopLevelModuleName . TCM.iModuleName . fst <$> Imp.typeCheckMain file
getModule :: TopLevelModuleName -> TCM (HighlightingInfo, String)
getModule m = do
Just mi <- TCM.getVisitedModule m
f <- findFile m
s <- liftIO . UTF8.readTextFile . filePath $ f
return (TCM.iHighlighting (TCM.miInterface mi), s)
pairPositions :: HighlightingInfo -> String -> [(Integer, String, Aspects)]
pairPositions info contents =
map (\cs@((mi, (pos, _)) : _) -> (toInteger pos, map (snd . snd) cs, maybe mempty id mi)) $
groupBy ((==) `on` fst) $
map (\(pos, c) -> (IntMap.lookup pos infoMap, (pos, c))) $
zip [1..] $
contents
where
infoMap = toMap (decompress info)
-- TODO make these more accurate
beginCode :: String -> Bool
beginCode s = "\\begin{code}" `isInfixOf` s
endCode :: String -> Bool
endCode s = "\\end{code}" `isInfixOf` s
infixEnd :: Eq a => [a] -> [a] -> [a]
infixEnd i s = head [drop (length i) s' | s' <- tails s, i `isPrefixOf` s']
stripBegin :: (Integer, String, Aspects) -> (Integer, String, Aspects)
stripBegin (i, s, mi) = (i, cut (dropWhile (== ' ') (infixEnd "\\begin{code}" s)), mi)
where
cut ('\n' : s') = s'
cut s' = s'
groupLiterate
:: [(Integer, String, Aspects)]
-> [Either String [(Integer, String, Aspects)]]
groupLiterate contents =
let (com, rest) = span (notCode beginCode) contents
in Left ("\n\n" ++ concat [s | (_, s, _) <- com] ++ "\n\n") : go rest
where
go [] = []
go (be : mis) =
let be'@(_, s, _) = stripBegin be
(code, rest) = span (notCode endCode) mis
in if "\\end{code}" `isInfixOf` s
then -- We simply ignore empty code blocks
groupLiterate mis
else Right (be' : code) :
-- If there's nothing between \end{code} and \begin{code}, we
-- start consuming code again.
case rest of
[] -> error "malformed file"
((_, beginCode -> True, _) : code') -> go code'
(_ : com ) -> groupLiterate com
notCode f (_, s, _) = not (f s)
annotate :: TopLevelModuleName -> Integer -> Aspects -> Html -> Html
annotate m pos mi = anchor ! attributes
where
attributes = [name (show pos)] ++
fromMaybe [] (definitionSite mi >>= link) ++
(case classes of [] -> []; cs -> [theclass (unwords cs)])
classes = maybe [] noteClasses (note mi) ++
otherAspectClasses (otherAspects mi) ++
maybe [] aspectClasses (aspect mi)
aspectClasses (Name mKind op) =
let kindClass = maybe [] ((: []) . showKind) mKind
showKind (Constructor Inductive) = "InductiveConstructor"
showKind (Constructor CoInductive) = "CoinductiveConstructor"
showKind k = show k
opClass = if op then ["Operator"] else []
in kindClass ++ opClass
aspectClasses a = [show a]
otherAspectClasses = map show
-- Notes are not included.
noteClasses _ = []
link (m', pos') = if m == m'
then Just [href ("#" ++ show pos')]
else Nothing
toMarkdown :: String
-> TopLevelModuleName -> [Either String [(Integer, String, Aspects)]]
-> String
toMarkdown classpr m contents =
concat [ case c of
Left s -> s
Right cs ->
let h = pre . tag "code" . mconcat $
[ (annotate m pos mi (stringToHtml s))
| (pos, s, mi) <- cs ]
in renderHtmlFragment (h ! [theclass classpr])
| c <- contents ]
convert :: String -> TopLevelModuleName -> TCM String
convert classpr m =
do (info, contents) <- getModule m
return . toMarkdown classpr m . groupLiterate . pairPositions info $ contents
markdownAgda :: CommandLineOptions -> String -> FilePath -> IO String
markdownAgda opts classpr fp =
do let check = do
TCM.setCommandLineOptions opts
checkFile (mkAbsolute fp) >>= convert classpr
r <- TCM.runTCMTop $ check `catchError` \err -> do
s <- prettyError err
liftIO (putStrLn s)
throwError err
case r of
Right s -> return (dropWhile isSpace s)
Left _ -> exitFailure
isAgda :: Item a -> Bool
isAgda i = ex == ".lagda"
where
ex = snd . splitExtension . toFilePath . itemIdentifier $ i
saveDir :: IO a -> IO a
saveDir m = do
origDir <- getCurrentDirectory
m <* setCurrentDirectory origDir
pandocAgdaCompilerWith :: ReaderOptions -> WriterOptions -> CommandLineOptions
-> Compiler (Item String)
pandocAgdaCompilerWith ropt wopt aopt = do
i <- getResourceBody
if isAgda i
then cached cacheName $ do
fp <- getResourceFilePath
-- TODO get rid of the unsafePerformIO, and have a more solid
-- way of getting the absolute path
unsafeCompiler $ saveDir $ do
-- We set to the directory of the file, we assume that
-- the agda files are in one flat directory which might
-- not be not the one where Hakyll is ran in.
abfp <- canonicalizePath fp
setCurrentDirectory (dropFileName abfp)
s <- markdownAgda aopt "Agda" abfp
let i' = i {itemBody = s}
case traverse (readMarkdown ropt) i' of
Left err -> fail $ "pandocAgdaCompilerWith: Pandoc failed with error " ++ show err
Right i'' -> return $ writePandocWith wopt i''
else pandocCompilerWith ropt wopt
where
cacheName = "LiterateAgda.pandocAgdaCompilerWith"
pandocAgdaCompiler :: Compiler (Item String)
pandocAgdaCompiler =
pandocAgdaCompilerWith defaultHakyllReaderOptions defaultHakyllWriterOptions
defaultOptions