1 files changed, 62 insertions, 7 deletions
diff --git a/html-test/run.hs b/html-test/run.hs
index 99ca1ec1..be31aeea 100755
--- a/html-test/run.hs
+++ b/html-test/run.hs
@@ -1,9 +1,16 @@
 #!/usr/bin/env runhaskell
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE RecordWildCards #-}
 
 
+import Control.Monad
+
+import Data.Maybe
+
+import System.Console.GetOpt
 import System.Directory
 import System.Environment
+import System.Exit
 import System.FilePath
 
 
@@ -17,22 +24,70 @@ refDir = baseDir </> "ref"
 outDir = baseDir </> "out"
 
 
+data Config = Config
+    { cfgHaddockPath :: FilePath
+    , cfgFiles :: [FilePath]
+    }
+
+
 main :: IO ()
 main = do
-    files <- processArgs =<< getArgs
-    putStrLn $ "Files to test: " ++ show files
+    Config { .. } <- parseArgs =<< getArgs
+    putStrLn $ "Files to test: " ++ show cfgFiles
+
+
+parseArgs :: [String] -> IO Config
+parseArgs args = do
+    let (flags, files, errors) = getOpt Permute options args
+
+    when (not $ null errors) $ do
+        mapM_ putStrLn errors
+        exitFailure
+
+    when (FlagHelp `elem` flags) $ do
+        putStrLn $ usageInfo "" options
+        exitSuccess
+
+    cfgFiles <- processFileArgs files
+    let cfgHaddockPath = haddockPath flags
 
+    return $ Config { .. }
 
-processArgs :: [String] -> IO [FilePath]
-processArgs [] = filter isSourceFile <$> getDirectoryContents srcDir
-processArgs args = pure $ map processArg args
+processFileArgs :: [String] -> IO [FilePath]
+processFileArgs [] = filter isSourceFile <$> getDirectoryContents srcDir
+processFileArgs args = pure $ map processFileArg args
 
 
-processArg :: String -> FilePath
-processArg arg
+processFileArg :: String -> FilePath
+processFileArg arg
     | isSourceFile arg = arg
     | otherwise = srcDir </> arg <.> "hs"
 
 
 isSourceFile :: FilePath -> Bool
 isSourceFile path = takeExtension path `elem` [".hs", ".lhs"]
+
+
+data Flag
+    = FlagHaddockPath FilePath
+    | FlagHelp
+    deriving Eq
+
+
+options :: [OptDescr Flag]
+options =
+    [ Option [] ["haddock-path"] (ReqArg FlagHaddockPath "FILE")
+        "path to Haddock executable to exectue tests with"
+    , Option ['h'] ["help"] (NoArg FlagHelp)
+        "display this help end exit"
+    ]
+
+
+haddockPath :: [Flag] -> FilePath
+haddockPath flags = case mlast [ path | FlagHaddockPath path <- flags ] of
+    Just path -> path
+    Nothing -> rootDir </> "dist" </> "build" </> "haddock" </> "haddock"
+
+
+mlast :: [a] -> Maybe a
+mlast = listToMaybe . reverse