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import Distribution.Simple
import Distribution.Simple.Setup
import Distribution.PackageDescription
import Distribution.Simple.LocalBuildInfo
import System.FilePath (combine, joinPath, takeFileName, takeExtension)
import System.Directory (getDirectoryContents, removeFile, copyFile)
import System.IO (readFile, writeFile)
import Control.Monad (foldM)
import Data.List (isPrefixOf)
main = defaultMainWithHooks myHooks
myHooks = defaultUserHooks { postConf = myPostConf, postClean = myPostClean }
pandocPath = combine "Text" "Pandoc"
-- Builds Text/Pandoc/ASCIIMathML.hs, Text/Pandoc/Writers/S5.hs, and
-- Text/Pandoc/Writers/DefaultHeaders.hs from templates and data.
myPostConf :: Args -> ConfigFlags -> PackageDescription -> LocalBuildInfo -> IO ()
myPostConf _ configFlags pkgDescription buildInfo = do
putStrLn "Generating source files from templates..."
fillAsciiMathMLTemplate
fillS5WriterTemplate
fillDefaultHeadersTemplate
let deps = packageDeps buildInfo
let highlighting = any (\id -> pkgName id == "highlighting-kate") deps
let highlightingModule = if highlighting
then combine "templates" "Highlighting.yes.hs"
else combine "templates" "Highlighting.no.hs"
copyFile highlightingModule $ joinPath ["Text", "Pandoc", "Highlighting.hs"]
putStrLn $ " Text/Pandoc/Highlighting.hs [" ++
(if highlighting then "with" else "without") ++ " syntax highlighting support]"
-- Fill templateFile with data in dataFiles and write to outputFile.
fillTemplate :: [FilePath] -> FilePath -> FilePath -> IO ()
fillTemplate dataFiles templateFile outputFile = do
template <- readFile (combine "templates" templateFile)
filled <- foldM processFile template $ map (combine "templates") dataFiles
writeTemplate (combine pandocPath outputFile) filled
fillAsciiMathMLTemplate :: IO ()
fillAsciiMathMLTemplate =
fillTemplate ["ASCIIMathML.js.comment", "ASCIIMathML.js.packed"] "ASCIIMathML.hs" "ASCIIMathML.hs"
fillS5WriterTemplate :: IO ()
fillS5WriterTemplate =
let s5Path = joinPath ["ui", "default"]
files = map (combine s5Path) ["slides.js.comment", "slides.js.packed", "s5-core.css",
"framing.css", "pretty.css", "opera.css", "outline.css", "print.css"]
in fillTemplate files "S5.hs" (combine "Writers" "S5.hs")
fillDefaultHeadersTemplate :: IO ()
fillDefaultHeadersTemplate = do
files <- getDirectoryContents (combine "templates" "headers") >>=
return . map (combine "headers") . filter (\x -> takeExtension x == ".header")
fillTemplate files "DefaultHeaders.hs" "DefaultHeaders.hs"
-- Post-clean: remove the files generated from templates.
myPostClean :: Args -> CleanFlags -> PackageDescription -> Maybe LocalBuildInfo -> IO ()
myPostClean _ _ _ _ = do
putStrLn "Removing source files generated from templates:"
removeGeneratedFile $ joinPath [pandocPath, "ASCIIMathML.hs"]
removeGeneratedFile $ joinPath [pandocPath, "DefaultHeaders.hs"]
removeGeneratedFile $ joinPath [pandocPath, "Highlighting.hs"]
removeGeneratedFile $ joinPath [pandocPath, "Writers", "S5.hs"]
-- Remove file and print message.
removeGeneratedFile :: FilePath -> IO ()
removeGeneratedFile fpath = do
putStrLn $ " " ++ fpath
removeFile fpath
-- Write the filled template file and print an explanatory message.
writeTemplate :: FilePath -> String -> IO ()
writeTemplate outfile contents = do
putStrLn $ " " ++ outfile
let warning = "-- This file is generated from a template in the templates subdirectory.\n\
\-- Modify that file, not this one.\n"
writeFile outfile (warning ++ contents)
-- Read contents of fpath and insert in template replacing @fpath@.
processFile :: String -> FilePath -> IO String
processFile template fpath = do
contents <- readFile fpath >>= return . show
return $ substitute ("@" ++ takeFileName fpath ++ "@") contents template
-- Replace each occurrence of one sublist in a list with another.
substitute :: (Eq a) => [a] -> [a] -> [a] -> [a]
substitute _ _ [] = []
substitute [] _ lst = lst
substitute target replacement lst =
if target `isPrefixOf` lst
then replacement ++ (substitute target replacement $ drop (length target) lst)
else (head lst):(substitute target replacement $ tail lst)
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