114 lines
3.5 KiB
Haskell
114 lines
3.5 KiB
Haskell
module Main where
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import Control.Monad (msum,guard,when)
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import Control.Monad.Trans (MonadIO(liftIO))
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import Data.List (isPrefixOf, isSuffixOf, (\\))
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import Data.Version (showVersion)
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import Happstack.Server
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import Happstack.Server.Compression
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import System.Directory
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import System.Environment
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import System.Exit
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import System.FilePath
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import System.Process
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import GHC.IO.Handle
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import qualified Elm.Internal.Paths as ElmPaths
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import Paths_elm_server
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runtime = "/elm-runtime.js"
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serve :: Int -> String -> IO ()
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serve portNumber libLoc = do
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putStrLn $ "Elm Server " ++ showVersion version ++
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": running at <http://localhost:" ++ show portNumber ++ ">"
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putStrLn "Just refresh a page to recompile it!"
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simpleHTTP httpConf $ do
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_ <- compressedResponseFilter
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msum [ uriRest serveElm
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, uriRest (serveLib libLoc)
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, serveDirectory EnableBrowsing [] "."
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]
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where httpConf = nullConf { port = portNumber }
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pageTitle :: String -> String
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pageTitle = dropExtension . takeBaseName
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serveElm :: FilePath -> ServerPartT IO Response
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serveElm fp =
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do fileExists <- liftIO $ doesFileExist file
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guard (fileExists && takeExtension fp == ".elm")
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onSuccess compile serve
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where
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file = tail fp
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compile = liftIO $ createProcess $ (proc "elm" args) { std_out = CreatePipe }
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where args = [ "--make", "--runtime=" ++ runtime, file ]
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serve = serveFile (asContentType "text/html")
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("build" </> replaceExtension file "html")
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onSuccess action success = do
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(_, stdout, _, handle) <- action
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exitCode <- liftIO $ waitForProcess handle
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case (exitCode, stdout) of
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(ExitFailure 127, _) ->
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badRequest $ toResponse "Error: elm binary not found in your path."
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(ExitFailure _, Just out) ->
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do str <- liftIO $ hGetContents out
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badRequest $ toResponse str
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(ExitFailure _, Nothing) ->
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badRequest $ toResponse "See command line for error message."
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(ExitSuccess, _) -> success
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serveLib :: FilePath -> String -> ServerPartT IO Response
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serveLib libLoc fp = do
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guard (fp == runtime)
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serveFile (asContentType "application/javascript") libLoc
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main :: IO ()
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main = getArgs >>= parse
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parse :: [String] -> IO ()
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parse ("--help":_) = putStrLn usage
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parse ("--version":_) = putStrLn ("The Elm Server " ++ showVersion version)
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parse args =
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if null remainingArgs then
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serve portNumber elmRuntime
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else
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putStrLn usageMini
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where
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runtimeArg = filter (isPrefixOf "--runtime-location=") args
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portArg = filter (isPrefixOf "--port=") args
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remainingArgs = (args \\ runtimeArg) \\ portArg
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argValue arg = tail $ dropWhile (/= '=') (head arg)
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portNumber = if null portArg then 8000 else read (argValue portArg) :: Int
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elmRuntime = if null runtimeArg then
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ElmPaths.runtime
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else
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argValue runtimeArg
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usageMini :: String
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usageMini =
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"Usage: elm-server [OPTIONS]\n\
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\Try `elm-server --help' for more information."
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usage :: String
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usage =
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"Usage: elm-server [OPTIONS]\n\
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\Compiles and serves .elm files from the current directory.\n\
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\Example: elm-server\n\
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\\n\
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\Server configuration:\n\
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\ --port set the port to listen on (default: 8000)\n\
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\\n\
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\Resource Locations:\n\
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\ --runtime-location set the location of the Elm runtime\n\
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\\n\
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\Compiler Information:\n\
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\ --version print the version information and exit\n\
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\ --help display this help and exit\n\
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\\n\
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\Elm home page: <http://elm-lang.org>"
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