module Network.WAI.Application.StaticPages (
parseRoutePaths
, renderStaticPages
, renderStaticPagesTo
) where
import Control.Monad (void)
import Data.List (partition)
import Network.Wai
import Network.Wai.Internal (ResponseReceived(..))
import Network.Wai.Test
import Network.HTTP.Types as H
import Blaze.ByteString.Builder (toByteStringIO)
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as BS8
import qualified Data.ByteString.Lazy as LBS
import Data.Text (Text)
import qualified Data.Text as T
import Data.Text.Encoding (encodeUtf8, decodeUtf8)
import Data.Monoid (mappend)
import System.Directory (createDirectoryIfMissing)
import System.IO (hFlush, withFile, IOMode(..))
renderStaticPagesTo :: Application
-> [Text]
-> (Text -> Request -> FilePath)
-> IO ()
renderStaticPagesTo app requests toFp = do
flip mapM_ requests $ \path -> do
let p = notEmpty $ noFrontSlash $ noTrailSlash path
let req = setRawPathInfo defaultRequest $ encodeUtf8 p
let outPath = toFp path req
print (p, outPath)
void $ app req $ \response -> do
let (s, h, streambody) = responseToStream response
if s /= H.status200
then error $ "unexpected status: " ++ show s ++
"\nheaders: " ++ show h
else do
createDirectoryIfMissing True $ dirname outPath
withFile outPath WriteMode $ \outHandle ->
streambody $ \body ->
body (toByteStringIO $ BS.hPut outHandle) (hFlush outHandle)
return ResponseReceived
where
dirname = T.unpack . T.intercalate "/" . init . T.splitOn "/" . T.pack
notEmpty t | T.null t = "/"
| otherwise = t
renderStaticPages :: Application
-> Text
-> [Text]
-> IO ()
renderStaticPages app directory requests =
renderStaticPagesTo app requests $ \_ req ->
T.unpack $ directory `mappend` emptyIndex (noTrailSlash $ decodeUtf8 $ rawPathInfo req) `mappend` ".html"
where
emptyIndex t | T.null t = "index"
| otherwise = t
noTrailSlash :: Text -> Text
noTrailSlash str | T.null str = str
noTrailSlash str | T.last str == '/' = T.init str
noTrailSlash str = str
noFrontSlash :: Text -> Text
noFrontSlash str | T.null str = str
noFrontSlash str | T.head str == '/' = T.tail str
noFrontSlash str = str
parseRoutePaths :: Text -> [Text]
parseRoutePaths =
parse [(0, "")] . filter (not . commentedOut) . filter (not . T.null) . T.lines
where
commentedOut = T.isPrefixOf "-- "
parse :: [(Int, Text)] -> [Text] -> [Text]
parse _ [] = []
parse prefixes (line:[]) = [snd $ parseLine prefixes line]
parse prefixes (line:nextLine:otherLines) =
let (prefixes', parsed) = parseLine prefixes line
(nextPrefixes, nextParsed) = parseLine prefixes' nextLine
rest = nextParsed : parse nextPrefixes otherLines
in if length nextPrefixes > length prefixes'
then rest
else parsed : rest
parseLine :: [(Int, Text)] -> Text -> ([(Int, Text)], Text)
parseLine prefixes line = (prefixes', parsed)
where
(smaller_prefixes, _) = partition (\(indent, _) -> numSpaces > indent) prefixes
numSpaces = T.length spaces
spaces = T.takeWhile (== ' ') line
prefixes' =
if null smaller_prefixes || numSpaces > (fst $ last smaller_prefixes)
then smaller_prefixes ++ [newPrefix]
else smaller_prefixes
newPrefix = (numSpaces, path)
parsed = foldl1 (</>) (map snd smaller_prefixes ++ [path])
where
a </> b = noTrailSlash a `mappend` "/" `mappend` noFrontSlash b
path =
case T.words line of
[p] -> p
_ -> error $ "Invalid line: " ++ show line